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Sample records for plasma total homocysteine

  1. Reduced plasma total homocysteine concentrations in Type 1 diabetes mellitus is determined by increased renal clearance.

    NARCIS (Netherlands)

    Veldman, B.A.J.; Vervoort, G.M.M.; Blom, H.J.; Smits, P.

    2005-01-01

    INTRODUCTION: Elevated plasma levels of total homocysteine are related to the development of vascular complications. Patients with diabetes mellitus are particularly at risk for the development of these complications. Several factors determine plasma total homocysteine including renal function.

  2. Oral and transdermal estrogens both lower plasma total homocysteine in male-to-female transsexuals

    NARCIS (Netherlands)

    Giltay, E.J.; Verhoef, P.; Gooren, L.J.G.; Geleijnse, J.M.; Schouten, E.G.; Stehouwer, C.D.A.

    2003-01-01

    Plasma total homocysteine (tHcy) levels are on average lower in women versus men, indicating an estrogenic effect. Oral estrogens (absorbed via the liver) may be hypothesized to have stronger effects on hepatic homocysteine metabolism than transdermal estrogens. We randomly assigned 30 male-to-femal

  3. Plasma total homocysteine increases from day 20 to 40 in breastfed but not formula-fed low-birthweight infants

    NARCIS (Netherlands)

    Fokkema, M R; Woltil, H A; van Beusekom, C M; Schaafsma, A; Dijck-Brouwer, D A J; Muskiet, F A J

    2002-01-01

    Homocysteine is an intermediate in the folate cycle and methionine metabolism. This study investigated whether formula-fed infants have different plasma total homocysteine to their breastfed counterparts, and during what period any difference developed. Plasma total homocysteine was determined in 53

  4. Betaine as a determinant of postmethionine load total plasma homocysteine before and after B-vitamin supplementation.

    NARCIS (Netherlands)

    Holm, P.I.; Bleie, O.; Ueland, P.M.; Lien, E.A.; Refsum, H.; Nordrehaug, J.E.; Nygard, O.

    2004-01-01

    OBJECTIVE: Betaine is a substrate in the betaine-homocysteine methyltransferase reaction, converting homocysteine to methionine. There are only sparse data on plasma betaine as a determinant of the plasma total homocysteine (tHcy) concentration. METHODS AND RESULTS: Ninety patients undergoing corona

  5. Dynamic monitoring of total plasma homocysteine in spontaneously hypertensive rats by LC-MS.

    Science.gov (United States)

    Hu, Lu-Feng; Li, Jun-Wei; Wang, Xian-Qin; Xu, Ren-Ai; Xu, Xue-Gu; Jiang, Hai-Yan; Zhang, Xiu-Hua

    2010-10-01

    Hypertension has been recognized to be closely related to plasma homocysteine levels (tHcy). Spontaneously hypertensive rats (SHR) are used widely for hypertension research, but it is unclear whether hypertension is related to high levels of tHcy in rat plasma. To test whether hyperhomocysteinemia occurs in SHR we dynamically measured plasma total homocysteine (tHcy) in SHR by liquid chromatography-tandem mass spectrometry (LC-MS). This analytical method has good linearity within the range of 1-100 micromol/L for tHcy in rat plasma with a correlation coefficient of R = 0.9975. After dynamic monitoring (12 weeks) on the plasma tHcy in SHR and Wistar-Kyoto rats, we found that there was no significant difference in tHcy level between SHR and Wistar-Kyoto rats, which was 6.98 +/- 1.82 micromol/L and 8.04 +/- 1.64 micromol/L, respectively. And there was no significantly high level of plasma tHcy in SHR.

  6. Total plasma homocysteine is associated with hypertension in Type I diabetic patients

    DEFF Research Database (Denmark)

    Neugebauer, S; Tarnow, L; Stehouwer, C D

    2002-01-01

    between plasma homocysteine concentrations, methylenetetrahydrofolate reductase gene polymorphism, hypertension, diabetic microvascular and macrovascular complications associated with kidney function. METHODS: Vascular complications, hypertension, methylenetetrahydrofolate reductase genotype (RFLP....../l in patients with normal GFR are not related to vascular complications, but to hypertension (8.6-11.3 micro mol/l: OR 1.9; >11.3 micro mol/l: OR 3.7). The risk for coronary heart disease (CHD) was also enhanced by a plasma homocysteine concentration greater than 11.3 micro mol/l (OR 5.9). Although the T allele...... was an independent determinant of plasma homocysteine, the methylenetetrahydrofolate reductase gene polymorphism was neither associated with diabetic vascular complications nor with hypertension. CONCLUSION/INTERPRETATION: Increased plasma homocysteine concentrations but not the T allele per se, enhance the risk...

  7. Oral vitamin B12 supplementation reduces plasma total homocysteine concentration in women in India.

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    Yajnik, Chittaranjan S; Lubree, Himangi G; Thuse, Nileema V; Ramdas, Lalita V; Deshpande, Swapna S; Deshpande, Vaishali U; Deshpande, Jyoti A; Uradey, Bhagyashree S; Ganpule, Anjali A; Naik, Sadanand S; Joshi, Niranjan P; Farrant, Hannah; Refsum, Helga

    2007-01-01

    People in India have a high prevalence of low vitamin B12 status and high plasma total homocysteine (tHcy) concentrations. In a proof of principle trial, we studied the effect of oral vitamin B12 (500 microg) and/or 100 g cooked green leafy vegetables (GLV) every alternate day in a 2x2 factorial design over a 6-week period. Forty-two non-pregnant vegetarian women (age 20-50 years) were randomly allocated to four study groups. Clinical measurements were made at the beginning and at the end of the study, and blood samples were collected before, and 2 and 6 weeks after commencement of intervention. Forty women completed the trial. Twenty-six women had low vitamin B12 status (15 micromol/L). GLV supplementation did not alter plasma folate or tHcy. Vitamin B12 supplementation increased plasma vitamin B12 concentration (125 to 215 pmol/L, p homocysteine (tHcy) concentrations.

  8. Total plasma homocysteine and methylenetetrahydrofolate reductase C677T polymorphism in patients with colorectal carcinoma

    Institute of Scientific and Technical Information of China (English)

    Sandra Battistelli; Aurelio Vittoria; Massimo Stefanoni; Camilla Bing; Franco Roviello

    2006-01-01

    AIM: To investigate the behaviour of total plasma homocysteine (tHcy) and its most common genetic determinant defect, the methylenetetrahydrofolate reductase C677T (C677TMTHFR) polymorphism in patients with early stage colorectal carcinoma.METHODS: tHcy was quantified by Abbott IMx immunoassay; screening for C677TMTHFR substitution was performed by PCR and restriction analysis.RESULTS: The frequency of the C/T and T/T genotypes of the C677TMTHFR gene polymorphism did not differ between the groups. The mean tHcy was statistically higher in cancer patients than in control subjects carrying the same C/C or C/T genotype, whereas there was no difference in the T/T homozygous carriers of the two groups. tHcy was significantly higher in the T/T homozygous carriers than in C/C and C/T genotype carriers.CONCLUSION: The statistically significant increase of tHcy observed in C/C and C/T genotype carriers among our cancer patients is related to substrate consumption dependent on the tumor cell proliferation rate, whereas the tHcy increase observed in T/T genotype carriers of both groups probably depends on the enzymatic deficit of the homocysteine conversion to methionine and/or on the folate deficiency.

  9. A high-protein diet increases postprandial but not fasting plasma total homocysteine concentrations: A dietary controlled, crossover trial in healthy volunteers

    NARCIS (Netherlands)

    Verhoef, P.; Vliet, T. van; Olthof, M.R.; Katan, M.B.

    2005-01-01

    Background: A high plasma concentration of total homocysteine (tHcy) is associated with increased risk of cardiovascular disease. A high protein intake and hence a high intake of methionine-the sole dietary precursor of homocysteine-may raise plasma tHcy concentrations. Objectives: We studied whethe

  10. Total plasma homocysteine, folate, and vitamin b12 status in healthy Iranian adults: the Tehran homocysteine survey (2003–2004/a cross – sectional population based study

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    Bandarian Fatemeh

    2006-02-01

    Full Text Available Abstract Background Elevated plasma total homocysteine is an independent risk factor for cardiovascular disease and a sensitive marker of the inadequate vitamin B12 and folate insufficiency. Folate and vitamin B12 have a protective effect on cardiovascular disease. This population based study was conducted to evaluate the plasma total homocysteine, folate, and vitamin B12 in healthy Iranian individuals. Methods This study was a part of the Cardiovascular Risk Factors Survey in the Population Lab Region of Tehran University has been designed and conducted based on the methodology of MONICA/WHO Project. A total of 1214 people aged 25–64 years, were recruited and assessed regarding demographic characteristics, homocysteine, folate, and vitamin B12 levels with interview, questionnaires, examination and blood sampling. Blood samples were gathered and analyzed according to standard methods. Results The variables were assessed in 1214 participants including 428 men (35.3% and 786 women (64.7%. Age-adjusted prevalence of hyperhomocysteinemia (Hcy≥15 μmol/L was 73.1% in men and 41.07% in women (P Conclusion These results revealed that the prevalence of hyperhomocysteinemia, low folate and vitamin B12 levels are considerably higher than other communities. Implementation of preventive interventions such as food fortification with folic acid is necessary.

  11. Reference interval determination of total plasma homocysteine in an Indian population.

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    Lahiri, Kapil D; Datta, Himadri; Das, Harendra N

    2014-01-01

    Hyperhomocysteinemia has been shown to be an independent risk factor for cardiovascular disease as well as retinal vascular occlusion. Because of the epidemiological, dietary, genetic and environmental diversity among the different countries, each country should establish the reference interval of homocysteine of their own population for recommending appropriate medical decision limits. Hence a total of 1,288 apparently healthy subjects including 636 male and 652 female were enrolled in the present study to determine the reference intervals of homocysteine in an Indian population. Results of the study were presented as mean, standard deviation, median and 2.5th and 97.5th percentile with the 0.90 confidence interval of each percentile values of homocysteine along with decade-wise changes.

  12. Betaine supplementation lowers plasma homocysteine in healthy men and women

    NARCIS (Netherlands)

    Steenge, G.R.; Verhoef, P.; Katan, M.B.

    2003-01-01

    Elevated levels of plasma total homocysteine are associated with a higher risk of cardiovascular disease. Betaine and 5-methyltetrahydrofolate can remethylate homocysteine into methionine via independent reactions. We determined the effect of daily betaine supplementation, compared with both folic a

  13. Relationship between plasma total homocysteine level and dietary caffeine and vitamin B6 intakes in pregnant women.

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    Shiraishi, Mie; Haruna, Megumi; Matsuzaki, Masayo; Ota, Erika; Murayama, Ryoko; Sasaki, Satoshi; Yeo, SeonAe; Murashima, Sachiyo

    2014-06-01

    A high total homocysteine (tHcy) level during pregnancy is a risk factor for adverse perinatal outcomes, such as fetal growth restriction and preeclampsia. Caffeine is assumed to increase tHcy levels by acting as a vitamin B6 antagonist. The objective of this study was to examine a relationship between circulating tHcy levels and dietary caffeine and vitamin B6 intakes in pregnant Japanese women. A total of 321 healthy women with singleton pregnancies were recruited in metropolitan Tokyo, from June to December 2008, resulting in the final number included in the study as 254. Dietary caffeine intakes did not correlate with plasma tHcy levels. When we analyzed the data according to caffeinated beverages, caffeinated tea consumption was positively associated with plasma tHcy levels only among the women with a high intake of vitamin B6 , after controlling for confounding factors (P = 0.029). No correlation between coffee consumption and plasma tHcy levels was found. Pregnant Japanese women might need to cut down the consumption of caffeinated tea as well as take sufficient vitamin B6 in order to prevent the tHcy levels from increasing.

  14. Consumption of high doses of chlorogenic acid, present in coffee, or black tea increases plasma total homocysteine concentrations in humans

    NARCIS (Netherlands)

    Olthof, M.R.; Hollman, P.C.; Zock, P.L.; Katan, M.B.

    2001-01-01

    In population studies, high intakes of coffee are associated with raised concentrations of plasma homocysteine, a predictor of risk of cardiovascular disease. Chlorogenic acid is a major polyphenol in coffee; coffee drinkers consume up to 1 g chlorogenic acid/d. OBJECTIVE: We studied whether

  15. Consumption of high doses of chlorogenic acid, present in coffee, or black tea increases plasma total homocysteine concentrations in humans

    NARCIS (Netherlands)

    Olthof, M.R.; Hollman, P.C.; Zock, P.L.; Katan, M.B.

    2001-01-01

    In population studies, high intakes of coffee are associated with raised concentrations of plasma homocysteine, a predictor of risk of cardiovascular disease. Chlorogenic acid is a major polyphenol in coffee; coffee drinkers consume up to 1 g chlorogenic acid/d. OBJECTIVE: We studied whether chlorog

  16. The effect of eight week low impact rhythmic aerobic training on total plasma homocysteine concentration in older non-athlete women

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    Shahla Dehghan1

    2009-01-01

    Full Text Available (Received 27 October, 2009 ; Accepted 23 December , 2009AbstractBackground and purpose: Homocysteine is a new cardiovascular risk factor that its enhancement can cause increase in cardiovascular diseases. Because of physical activity importance in cardiovascular diseases prevention (specially in older people this study intend to investigate the effect of 8-week low impact rhythmic aerobic (LIA exercise on total plasma homocysteine concentration in non athlete Iranian older women for first time.Materials and methods: Twenty five healthy women of (60-85 in Taravat retirement home at Shahrekord were the statistical sample of this study. They were purposefully divided in to two groups: (including experimental and control. The Control group was also able to do the physical activity. At first, anthropometric characteristics including height, weight, Body Mass index (BMI and Waist-to-Hip Ratio (WHR were measured and recorded. Then resting blood sampling was taken from anterior vein in 5cc amount, while they did not eat any breakfast for 8-hours. Experimental group were directed to the LIA exercise program such as musical aerobic exercise with 40 percent of maximum heart rate for 15 minutes in first week and with 65 percent maximum heart rate for 40 minutes in the final week. Then WHR, BMI, resting blood sampling and total plasma homocysteine were measured again.Results: For pre-test and post-test data comparison in two groups paired t-test and between groups in dependent t-test and Pearson correlation coefficient for assessment of relationship between homocysteine with WHR and BMI were applied. According to these results, there was a significant difference between total plasma homocysteine, BMI and WHR before and after the training in experimental group while nonsignificant difference was observed in control group. In investigating the relationship among these factors in experimental group, although there was not a meaningful relationship between BMI

  17. Association of seven functional polymorphisms of one-carbon metabolic pathway with total plasma homocysteine levels and susceptibility to Parkinson's disease among South Indians.

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    Kumudini, Nadella; Uma, Addepally; Naushad, Shaik Mohammad; Mridula, Rukmini; Borgohain, Rupam; Kutala, Vijay Kumar

    2014-05-07

    This study from South India was performed to ascertain the impact of seven functional polymorphisms of one-carbon metabolic pathway on total plasma homocysteine levels and susceptibility to PD. A total of 151 cases of Parkinson's disease and 416 healthy controls were analyzed for fasting plasma homocysteine levels by reverse phase HPLC. PCR-RFLP approaches were used to analyze glutamate carboxypeptidase II (GCPII) 1561 C>T, reduced folate carrier 1 (RFC1) 80 G>A, cytosolic serine hydroxymethyl transferase (cSHMT) 1420 C>T, methylene tetrahydrofolate reductase (MTHFR) 677 C>T, methionine synthase (MTR) 2756 A>G and methionine synthase reductase (MTRR) 66 A>G polymorphisms. PCR-AFLP was used for the analysis of thymidylate synthase (TYMS) 5'-UTR 28bp tandem repeat. PD cases exhibited elevated plasma homocysteine levels compared to controls (men: 28.8 ± 6.9 vs. 16.4 ± 8.8 μmol/L; women: 25.4 ± 5.3 vs. 11.2 ± 5.1μmol/L). Homocysteine levels showed positive correlation with male gender (r=0.39, pG (r=0.31, pT polymorphism. MTRR 66 A>G polymorphism showed independent risk for PD (OR: 3.42, 95% CI: 2.35-4.98) whereas cSHMT 1420 C>T conferred protection against PD (OR: 0.11, 95% CI: 0.07-0.17). Multifactor dimensionality reduction analysis showed synergistic interactions between MTHFR 677 C>T and MTRR 66 A>G, whereas cSHMT 1420 C>T exhibited counteracting interactions in altering susceptibility to PD. To conclude, PD cases exhibited hyperhomocysteinemia and MTRR 66 A>G and cSHMT 1420 C>T gene variants were shown to modulate PD risk by altering the homocysteine levels.

  18. Exploratory study of plasma total homocysteine and its relationship to short-term outcome in acute ischaemic stroke in Nigerians

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    Awosanya Gbolahan O

    2008-07-01

    Full Text Available Abstract Background Hyperhomocysteinemia is a potentially modifiable risk factor for stroke, and may have a negative impact on the course of ischaemic stroke. The role of hyperhomocysteinemia as it relates to stroke in Africans is still uncertain. The objective of this study was to determine the prevalence and short-term impact of hyperhomocysteinemia in Nigerians with acute ischaemic stroke. We hypothesized that Hcy levels are significantly higher than in normal controls, worsen stroke severity, and increase short-term case fatality rates following acute ischaemic stroke. Methods The study employed both a case-control and prospective follow-up design to study hospitalized adults with first – ever acute ischaemic stroke presenting within 48 hours of onset. Clinical histories, neurological evaluation (including National Institutes of Health Stroke Scale (NIHSS scores on admission were documented. Total plasma Hcy was determined on fasting samples drawn from controls and stroke cases (within 24 hours of hospitalization. Outcome at 4 weeks was assessed in stroke patients using the Glasgow Outcome Scale (GOS. Results We evaluated 155 persons (69 acute ischaemic stroke and 86 healthy controls. The mean age ± SD of the cases was 58.8 ± 9.8 years, comparable to that of controls which was 58.3 ± 9.9 years (T = 0.32; P = 0.75. The mean duration of stroke (SD prior to hospitalization was 43.5 ± 38.8 hours, and mean admission NIHSS score was 10.1 ± 7.7. Total fasting Hcy in stroke patients was 10.2 ± 4.6 umol/L and did not differ significantly from controls (10.1 ± 3.6 umol/L; P = 0.88. Hyperhomocysteinemia, defined by plasma Hcy levels > 90th percentile of controls (>14.2 umol/L in women and >14.6 umol/L in men, was present in 7 (10.1% stroke cases and 11 (12.8% controls (odds ratio 0.86, 95% confidence interval 0.31 – 2.39; P > 0.05. In multiple regression analysis admission NIHSS score (but not plasma Hcy was a significant determinant of 4

  19. Vitamin B12 and folic acid supplementation and plasma total homocysteine concentrations in pregnant Indian women with low B12 and high folate status.

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    Katre, Prachi; Bhat, Dattatray; Lubree, Himangi; Otiv, Suhas; Joshi, Suyog; Joglekar, Charudatta; Rush, Elaine; Yajnik, Chittaranjan

    2010-01-01

    Maternal vitamin B12 deficiency and hyperhomocysteinemia predict poor pregnancy outcome, foetal adiposity and insulin resistance. In India amongst practicing clinicians and policy makers there is little appreciation of widespread vitamin B12 deficiency. We investigated 163 (86 rural, 77 urban) pregnant women attending antenatal clinics in a rural health centre and a referral hospital in the city of Pune, at 17, 28, and 34 weeks gestation for vitamin supplements, and circulating concentrations of vitamin B12, folate, and total homocysteine. At enrolment 80% rural and 65% urban women had low vitamin B12 but only two rural women had low folate concentrations. During pregnancy 85% rural and 95% of urban women received folic acid; 12% rural and 84% urban women also received vitamin B12. In women receiving no supplementation (n=17) plasma vitamin B12 and folate did not change from 17 to 34 weeks gestation, but homocysteine increased (pHomocysteine concentrations at 34 weeks gestation in women receiving only folic acid (n=71, mean 8.4 (95% CI 7.8, 9.1) micromol/L) were comparable to the unsupplemented group (9.7 (7.3, 12.7), p=0.15), but women who received a total dose of >1000 microg of vitamin B12 up to 34 weeks (n=42, all with folic acid) had lower concentrations (6.7 (6.0, 7.4), phomocysteine concentration. In vitamin B12 insufficient, folate replete pregnant women, vitamin B12 supplementation is associated with a reduction of plasma total homocysteine concentration in late pregnancy.

  20. [Plasma homocysteine levels in patients with ischemic heart disease].

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    Márk, L; Erdei, F; Márki-Zay, J; Nagy, E; Kondacs, A; Katona, A

    2001-07-29

    In the latest years it became clear that beside traditional cardiovascular risk factors the high plasma homocysteine level increases the risk of atherosclerotic diseases too. Metaanalysis of 27 papers found that 10% of population's coronary risk is attributable to homocysteine and a 5 mumol/l increase in its plasma level elevates the coronary risk by as much as 0.5 mumol/l cholesterol increase. Recent studies have shown an inverse relation between the levels of plasma homocysteine and that of folic acid, vitamin B6, vitamin B12. The latters are cofactors and substrates of the homocysteine and methionin metabolism. The plasma total cholesterol, HDL-cholesterol, triglyceride, lipoprotein(a), Apo A1, Apo B and homocysteine concentrations were examined in 39 patients suffering from coronary artery disease treated in the Cardiac Rehabilitation Department of our hospital. Twenty of them were treated by folic acid and vitamin B6 for a three week period. The mean (+/- SD) plasma homocysteine concentration was 15.60 +/- 6.14 mumol/l. In the treated subgroup the mean (+/- SD) plasma homocysteine concentration was 17.3 +/- 7.00 mumol/l, the mean (+/- SD) plasma folic acid level was 8.58 +/- 4.6 mumol/l. After the three week treatment period (folic acid and vitamin B6) the plasma homocysteine level decreased by 26.5% (p = 0.012), that of folic acid increased by 68.7% (p = 0.002). From the plasma lipids the level of total- and LDL-cholesterol decreased significantly (6.7% and 10.4%, P gen of the metylenetetrahydrofolate-reductase (MTHFR) enzyme there was a significant correlation with homocysteine level (r = 0.436, p = 0.010), and a negative, but not significant correlation with the folic acid level (r = -0.354).

  1. Betaine supplementation lowers plasma homocysteine levels in healthy men and women

    NARCIS (Netherlands)

    Steenge, G.R.S.; Verhoef, P.; Katan, M.B.

    2003-01-01

    Elevated levels of plasma total homocysteine are associated with a higher risk of cardiovascular disease. Betaine and 5-methyltetrahydrofolate can remethylate homocysteine into methionine via independent reactions. We determined the effect of daily betaine supplementation, compared with both folic a

  2. Evaluation of plasma concentrations of homocysteine, IL-6, TNF-alpha, hs-CRP, and total antioxidant capacity in patients with end-stage renal failure.

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    Mahin Babaei

    2014-12-01

    Full Text Available It has been proved that hyperhomocysteinemia has a high prevalence in patients with end-stage renal disease (ESRD, which may contribute to the high cardiovascular risk in these patients. Cardiovascular disease is the first cause of high mortality rate in ESRD patients. The aim of the present study was to assess five important factors in patients with ESRD (the amount of homocysteine, IL-6, TNF-alpha, hs-CRP, and Total Antioxidant Capacity. These factors were surveyed in ESRD patients to compare with healthy subjects. In a cross-sectional study, we enrolled 80 patients on maintenance hemodialysis and measured the inflammatory and oxidative stress indicators. The plasma samples were assayed for five above mentioned variables using standard protocols. Two-hour post hemodialysis plasma samples were also assayed for TAC. Plasma levels of inflammation markers, IL-6 and hs-CRP, homocysteine were significantly increased in ESRD group versus control group. This increase was also found in TNF-α levels as compared to the controls, but the differences were not statistically significant. Also, the post dialysis samples had significantly lower levels of TAC as compared to predialysis ones.

  3. Evaluation of plasma concentrations of homocysteine, IL-6, TNF-alpha, hs-CRP, and total antioxidant capacity in patients with end-stage renal failure.

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    Babaei, Mahin; Dashti, Nasrin; Lamei, Navid; Abdi, Khosrou; Nazari, Farhad; Abbasian, Sepideh; Gerayeshnejad, Siavash

    2014-01-01

    It has been proved that hyperhomocysteinemia has a high prevalence in patients with end-stage renal disease (ESRD), which may contribute to the high cardiovascular risk in these patients. Cardiovascular disease is the first cause of high mortality rate in ESRD patients. The aim of the present study was to assess five important factors in patients with ESRD (the amount of homocysteine, IL-6, TNF-alpha, hs-CRP, and Total Antioxidant Capacity). These factors were surveyed in ESRD patients to compare with healthy subjects. In a cross-sectional study, we enrolled 80 patients on maintenance hemodialysis and measured the inflammatory and oxidative stress indicators. The plasma samples were assayed for five above mentioned variables using standard protocols. Two-hour post hemodialysis plasma samples were also assayed for TAC. Plasma levels of inflammation markers, IL-6 and hs-CRP, homocysteine were significantly increased in ESRD group versus control group. This increase was also found in TNF-α levels as compared to the controls, but the differences were not statistically significant. Also, the post dialysis samples had significantly lower levels of TAC as compared to predialysis ones.

  4. A Protein Extract from Chicken Reduces Plasma Homocysteine in Rats

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    Vegard Lysne

    2015-06-01

    Full Text Available The present study aimed to evaluate effects of a water-soluble protein fraction of chicken (CP, with a low methionine/glycine ratio, on plasma homocysteine and metabolites related to homocysteine metabolism. Male Wistar rats were fed either a control diet with 20% w/w casein as the protein source, or an experimental diet where 6, 14 or 20% w/w of the casein was replaced with the same amount of CP for four weeks. Rats fed CP had reduced plasma total homocysteine level and markedly increased levels of the choline pathway metabolites betaine, dimethylglycine, sarcosine, glycine and serine, as well as the transsulfuration pathway metabolites cystathionine and cysteine. Hepatic mRNA level of enzymes involved in homocysteine remethylation, methionine synthase and betaine-homocysteine S-methyltransferase, were unchanged, whereas cystathionine gamma-lyase of the transsulfuration pathway was increased in the CP treated rats. Plasma concentrations of vitamin B2, folate, cobalamin, and the B-6 catabolite pyridoxic acid were increased in the 20% CP-treated rats. In conclusion, the CP diet was associated with lower plasma homocysteine concentration and higher levels of serine, choline oxidation and transsulfuration metabolites compared to a casein diet. The status of related B-vitamins was also affected by CP.

  5. Plasma total homocysteine (THCY) level and other biochemical risk factors in hypertensives with and without cardiovascular events

    Institute of Scientific and Technical Information of China (English)

    Akande AA; Salisu OT; Omotoso ABO; Kolo PM

    2009-01-01

    Objective:The aim of this study is to assess the correlation between traditional cardiovascular risk factors and elevated plasma tHcy level in Nigerian hypertensive. Methods: Thirty-six hypertensive patients were recruited with 36 age and sex-matched controls. The age, sex and anthropometric measurements including height, weight and body mass index (BMI) were taken. Plasma total cholesterol, low density lipoprotein cholesterol (LDL-C), high density lipoprotein cholesterol (HDL-C), tri-glycerides and tHey were analyzed. The results of the two groups were compared. Results: The mean total cholesterol and LDL-C were significantly higher in the subjects than in the controls (P=0.01 and 0.03 respectively). On the other hand, means of HDL-C and triglycerides were not significantly different between the two groups (P = 0.06 and O. 68 respectively). Mean total plasma tHey was (12. 95±4.9)μmol/L in hypertensive patients when compared with (11.29±3.6)μmol/L in the controls (P =0.09), however the mean they was significantly higher in hypertensive patients who had stroke or myocardial infarction than those without these complications (one way Anova F = 3.63, P =0.04). Significant positive correlation was seen between tHcy and systolic blood pressure, diastolic blood pressure, BMI and LDL-C. Conclusion:The study suggests that elevated plasma tH-ey may predict occurrence of cardiovascular complications in hypertensive individuals.

  6. Methodology for a rapid and simultaneous determination of total cysteine, homocysteine, cysteinylglycine and glutathione in plasma by isocratic RP-HPLC.

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    Ferin, Rita; Pavão, Maria Leonor; Baptista, José

    2012-12-12

    Alterations in the plasma aminothiols levels can be considered as important biomarkers for the diagnosis and screening of several human disorders, namely cardiovascular diseases. We aimed to optimize a rapid, sensitive and accurate RP-HPLC methodology with fluorescence detection, for the simultaneous determination of the total concentrations of cysteine, homocysteine, cysteinylglycine and glutathione in blood plasma, as well as its application to the evaluation of those thiols levels in plasma of a group of Azorean subjects. Aminothiols were reduced with tri-n-butylphosphine and derivatized with a thiol-specific fluorogenic reagent ammonium 7-fluorobenzo-2-oxa-1,3-diazole-4-sulphonate. The thiols adducts were separated by an isocratic elution on a Platinum EPS C18 analytical column (53mm×7mm I.D., 3μm) using a phosphate buffer containing 4% of acetonitrile as a mobile phase. Results indicated an excellent linearity for all the analytes over their respective concentration ranges with correlation coefficients (r(2)) ≥0.99. The LOD for the four plasma thiols was lower than 0.10μmol/L, while LOQ varied from 0.5 to 15μmol/L. For both intra- and inter-day precision, the RSD (%) values were lower than 1.9%, and the CV (%) values were found under 0.5%. The recovery ranged from 92% to 100% indicating a high degree of the method's accuracy. This method allows a simultaneous, complete analysis of the four plasma aminothiols and the internal standard in 6min. By reducing the total run time, a larger number of analysis can be performed daily.

  7. Plasma homocysteine concentrations in novel microminipigs.

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    Kakimoto, Toshiaki; Otsuka, Akira; Kawaguchi, Hiroaki; Ogata, Kenji; Tanimoto, Akihide; Kanouchi, Hiroaki

    2014-01-01

    A novel microminipig has been recently developed for use in biomedical research. In the present study, age- and sex-related differences, as well as 24-h fluctuations in plasma total homocysteine concentrations (tHcy), were investigated in these microminipigs. tHcy (mean±SD) was 10.2±3.4 μM and significantly correlated with age. By contrast, neither the differences in tHcy between sexes nor the 24-h fluctuations in tHcy after feeding were significant. The kinetics of plasma tHcy after intravenous injection of reduced Hcy showed that its levels peaked within 5 min post-injection, as did the levels of tHcy. These results suggested that reduced Hcy is rapidly oxidized or metabolized. The half-lives of reduced Hcy, tHcy, and reduced cysteine in the blood were 47, 71, and 141 min, respectively. In conclusion, there was a significantly positive correlation between age and plasma tHcy in microminipigs. After intravenous injection of reduced Hcy, plasma tHcy quickly returned to pre-injection levels. Copyright © 2014 International Institute of Anticancer Research (Dr. John G. Delinassios), All rights reserved.

  8. Betaine and folate status as cooperative determinants of plasma homocysteine in humans.

    NARCIS (Netherlands)

    Holm, P.I.; Ueland, P.M.; Vollset, S.E.; Midttun, O.; Blom, H.J.; Keijzer, M.B.; Heijer, M. den

    2005-01-01

    OBJECTIVE: Two published studies have demonstrated that betaine in the circulation is a determinant of plasma total homocysteine, but none had sufficient power to investigate the possible effect modification by folate status. METHODS AND RESULTS: We measured homocysteine, betaine, folate, vitamin B(

  9. Choline supplemented as phosphatidylcholine decreases fasting and postmethionine-loading plasma homocysteine concentrations in healthy men

    NARCIS (Netherlands)

    Olthof, M.R.; Brink, E.J.; Katan, M.B.; Verhoef, P.

    2005-01-01

    Background: A high homocysteine concentration is a potential risk factor for cardiovascular disease that can be reduced through betaine supplementation. Choline is the precursor for betaine, but the effects of choline supplementation on plasma total homocysteine (tHcy) concentrations in healthy

  10. Choline supplemented as phosphatidylcholine decreases fasting and postmethionine-loading plasma homocysteine concentrations in healthy men

    NARCIS (Netherlands)

    Olthof, M.R.; Brink, E.J.; Katan, M.B.; Verhoef, P.

    2005-01-01

    Background: A high homocysteine concentration is a potential risk factor for cardiovascular disease that can be reduced through betaine supplementation. Choline is the precursor for betaine, but the effects of choline supplementation on plasma total homocysteine (tHcy) concentrations in healthy huma

  11. Plasma homocysteine levels in female patients with eating disorders.

    NARCIS (Netherlands)

    Levine, J.; Gur, E.; Loewenthal, R.; Vishne, T.; Dwolatzky, T.; Beijnum, I.M. van; Sela, B.A.; Vered, I.; Yosef, G.; Stein, D.

    2007-01-01

    OBJECTIVE: To examine plasma homocysteine, vitamin B(12), and folate levels in females with restricting and bingeing/purging eating disorders (EDs). METHOD: Adolescent and adult female patients were compared to appropriate control groups with regard to plasma homocysteine levels. RESULTS: The plasma

  12. Plasma choline and betaine and their relation to plasma homocysteine in normal pregnancy

    NARCIS (Netherlands)

    Velzing-Aarts, Francien V; Holm, Pål I; Fokkema, M Rebecca; van der Dijs, Fey P; Ueland, Per M; Muskiet, Frits A

    2005-01-01

    Background: Plasma concentrations of total homocysteine (tHcy) decrease during pregnancy. This reduction has been investigated in relation to folate status, but no study has addressed the possible role of betaine and its precursor choline. Objective: We investigated the courses of plasma choline and

  13. Effect of lipid-lowering and anti-hypertensive drugs on plasma homocysteine levels

    Directory of Open Access Journals (Sweden)

    Jutta Dierkes

    2007-03-01

    Full Text Available Jutta Dierkes, Claus Luley, Sabine WestphalInstitute of Clinical Chemistry and Biochemistry, University Hospital Magdeburg, Germany Abstract: Elevated plasma concentrations of homocysteine, a sulfur-containing amino acid, are a risk factor for coronary, cerebral and peripheral artery disease. Next to other factors, drugs used for the prevention or treatment of cardiovascular disease may modulate plasma homocysteine levels. Thus, a drug induced homocysteine increase may counteract the desired cardioprotective effect. The aim is to summarize the current knowledge on the effect of two important classes of drugs, lipid-lowering drugs and anti-hypertensive drugs, on homocysteine metabolism. Among the lipid-lowering drugs, especially the fibric acid derivatives, which are used for treatment of hypertriglyceridemia and low HDL-cholesterol, are associated with an increase of homocysteine by 20%–50%. This increase can be reduced, but not totally avoided by the addition of folic acid, vitamin B12 and B6 to fibrates. HMG-CoA reductase inhibitors (statins do not influence homocysteine concentrations substantially. The effects of nicotinic acid and n3-fatty acids on the homocysteine concentrations are less clear, more studies are necessary to clarify their influence on homocysteine. Antihypertensive drugs have also been studied with respect to homocysteine metabolism. A homocysteine increase has been shown after treatment with hydrochlorothiazide, a lowering was observed after treatment with ß-blockers, but no effect with ACE-inhibitors. The clinical significance of the homocysteine elevation by fibrates and thiazides is not clear. However, individual patients use these drugs for long time, indicating that even moderate increases may be important.Keywords: homocysteine, fibrates, diuretics, cardiovascular disease

  14. The C677T MTHFR genotypes influence the efficacy of B9 and B12 vitamins supplementation to lowering plasma total homocysteine in hemodialysis.

    Science.gov (United States)

    Achour, Ons; Elmtaoua, Sahbi; Zellama, Dorsaf; Omezzine, Asma; Moussa, Amira; Rejeb, Jihene; Boumaiza, Imene; Bouacida, Lobna; Rejeb, Nabila Ben; Achour, Abdellatif; Bouslama, Ali

    2016-10-01

    Hyperhomocysteinaemia, an independent risk factor for cardiovascular diseases, is common in hemodialysis patients (HD) and particularly in those homozygous for polymorphism of the 5,10-methylenetetrahydrofolate reductase (MTHFR) gene. B vitamins supplementation has been shown to lower plasma total homocysteine (tHcy), but this has been contreversed in several groups. The aim of our study was to explore the response of tHcy in hemodialysis (HD) patients to individual supplementation with folic acid (B9) and/or vitamin B12, based on carrier status for the (MTHFR) polymorphism. 132HD were randomized according to C677TMTHFR genotypes into 2 groups (AandB). The group (A) was treated initially with B9 (10mg/day orally) for 2 months (t1) and then with B12 vitamin (cyanocobalamin ampoule of 1000 μg) for the following 2 months (t2), then association of B9 and B12 for 2 months (t3). The group (B) was supplemented initially with vitamin B12 (t1), then with folic acid (t2) and then B9 + B12 for 2 months (t3). A wash-out period of 2 months followed the treatment in both groups (t4). We determined tHcy, B9 and B12 concentrations at each time. In group A, we noted that the decrease in tHcy becomes significant for CC when patients were supplemented with vit B12 only (p = 0.009). While, B9 + vit B12 supplementation did not seem to improve a significant effect compared with B12 alone. For genotypes (CT) and (TT) we noticed a significant decrease in tHcy at t1 (p = 0.038; 0.005 respectively) and at (t3; CT p = 0.024; TT p = 0.017). In group B, for genotypes CC, the decrease in tHcy became significant at t3 (vit B12 + B9; p = 0.031). For genotypes (CT) and (TT), at the replacement of vit B12 by B9, tHcy was significantly decreased (p = 0.036; 0.012, respectively). The combination of the 2 vitamins (t3) showed no difference compared to folate alone. In the 2 groups (t4), there was an significant increase of tHcy again for 3 genotypes. Supplementation with B

  15. Elevated plasma homocysteine level is possibly associated with skin sclerosis in a series of Japanese patients with systemic sclerosis.

    Science.gov (United States)

    Motegi, Sei-Ichiro; Toki, Sayaka; Yamada, Kazuya; Uchiyama, Akihiko; Ishikawa, Osamu

    2014-11-01

    Homocysteine is a sulfhydryl-containing amino acid that is derived from dietary methionine, and there has been increasing evidence that elevated plasma homocysteine levels are associated with increased risk of cardiovascular diseases, including carotid, coronary and peripheral arterial disease (PAD). The association of plasma homocysteine levels with peripheral vascular involvements, such as Raynaud phenomenon (RP), digital ulcers (DU) in systemic sclerosis (SSc) patients has not been well studied. The objective of this study was to examine plasma homocysteine levels and their clinical associations in patients with SSc. Plasma homocysteine levels in 151 Japanese patients with SSc and 20 healthy controls were examined. No significant differences were observed in plasma homocysteine levels between SSc patients and healthy individuals. Demographic and clinical features of the SSc patients revealed that severe skin sclerosis, anti-topoisomerase I antibody positivity, complications of DU, acro-osteolysis (AO) and interstitial lung disease (ILD) were significantly more prevalent among the patients with elevated plasma homocysteine levels. The plasma homocysteine levels were positively correlated with modified Rodnan total skin score. The plasma homocysteine levels in the SSc patients with DU, AO and ILD were significantly higher than those in the SSc without DU, AO and ILD, respectively. Plasma homocysteine levels did not correlate with either the mean or max intima-media thickness (IMT) or plaque score, suggesting that plasma homocysteine levels might not be associated with carotid artery atherosclerosis in SSc patients. The measurement of plasma homocysteine levels in SSc patients might be useful for the risk stratifications of severe skin sclerosis, DU and AO.

  16. Prenatal diagnosis of methylmalonic aciduria by analysis of organic acids and total homocysteine in amniotic fluid.

    Science.gov (United States)

    Zhang, Yao; Yang, Yan-ling; Hasegawa, Yuki; Yamaguchi, Seiji; Shi, Chun-yan; Song, Jin-qing; Sayami, Sujan; Liu, Ping; Yan, Rong; Dong, Jin-hua; Qin, Jiong

    2008-02-05

    Methylmalonic aciduria (MMA) is the most frequent disease of organic aciduria in China. Various biochemical strategies are followed for the prenatal diagnosis of MMA. However, since fetuses affected by MMA have decreased excretion of methylmalonic acid, the difficulties of prenatal biochemical diagnosis are obvious. Gas chromatography mass spectrometry (GC/MS) and tandem mass spectrometry (ESI/MS/MS) have allowed us to identify the disease in affected fetuses. The aim of this study was to determine the value of analysis of organic acids and total homocysteine in amniotic fluid in prenatal diagnosis of MMA. The clinical diagnoses and outcomes of nine probands with MMA and the prenatal diagnoses based on biochemical analysis of nine fetuses at risk for MMA were investigated. Amniotic fluid samples from pregnancies at risk for MMA and metabolically normal pregnancies were obtained at 16 - 24 weeks of gestation. Methylmalonic acid and methylcitric acid were measured by GC/MS, propionylcarnitine was analyzed by ESI/MS/MS, and total homocysteine was determined by fluorescence polarization immunoassay. In two pregnancies, high levels of methylmalonic acid, methylcitric acid, propionylcarnitine, and total homocysteine indicated combined MMA and homocysteinemia in the fetuses. One of the mothers continued pregnancy and received cobalamin supplement as prenatal treatment, and the other terminated her pregnancy. In one pregnancy, significantly elevated levels of methylmalonic acid, methylcitric acid, and propionylcarnitine, and normal level of total homocysteine was found indicating isolated MMA in the fetus; abortion was performed on this case. In the other six pregnancies, all the levels of the above mentioned metabolites were normal suggesting that the fetuses were not affected by MMA. The diagnoses were confirmed after delivery by testing urinary organic acids and plasma total homocysteine. The metabolic abnormalities of MMA occur early in gestation. The level of total

  17. Diurnal variations of plasma homocysteine, total antioxidant status, and biological markers of muscle injury during repeated sprint: effect on performance and muscle fatigue--a pilot study.

    Science.gov (United States)

    Hammouda, Omar; Chtourou, Hamdi; Chahed, Henda; Ferchichi, Salyma; Kallel, Choumous; Miled, Abdelhedi; Chamari, Karim; Souissi, Nizar

    2011-12-01

    The aim of this study was (i) to evaluate whether homocysteine (Hcy), total antioxidant status (TAS), and biological markers of muscle injury would be affected by time of day (TOD) in football players and (ii) to establish a relationship between diurnal variation of these biomarkers and the daytime rhythm of power and muscle fatigue during repeated sprint ability (RSA) exercise. In counterbalanced order, 12 football (soccer) players performed an RSA test (5 x[6 s of maximal cycling sprint + 24 s of rest]) on two different occasions: 07:00-08:30 h and 17:00-18:30 h. Fasting blood samples were collected from a forearm vein before and 3-5 min after each RSA test. Core temperature, rating of perceived exertion, and performances (i.e., Sprint 1, Sprint 2, and power decrease) during the RSA test were significantly higher at 17:00 than 07:00 h (p RSA test. However, biomarkers of antioxidant status' resting levels (i.e., total antioxidant status, uric acid, and total bilirubin) were higher in the morning. This TOD effect was suppressed after exercise for TAS and uric acid. In conclusion, the present study confirms diurnal variation of Hcy, selected biological markers of cellular damage, and antioxidant status in young football players. Also, the higher performances and muscle fatigue showed in the evening during RSA exercise might be due to higher levels of biological markers of muscle injury and lower antioxidant status at this TOD.

  18. Unfiltered coffee increases plasma homocysteine concentrations in healthy volunteers: a randomized trial

    NARCIS (Netherlands)

    Grubben, M.J.; Boers, G.H.; Blom, H.J.; Broekhuizen, R.; Jong, de R.; Rijt, van L.; Katan, M.B.

    2000-01-01

    Background: An elevated plasma homocysteine concentration is a putative risk factor for cardiovascular disease. Observational studies have reported an association between coffee consumption and plasma homocysteine concentrations. Objective: We studied the effect of coffee consumption on plasma

  19. Plasma folic acid cutoff value, derived from its relationship with homocyst(e)ine

    NARCIS (Netherlands)

    Brouwer, D A; Welten, H T; Reijngoud, D J; van Doormaal, J J; Muskiet, F A

    1998-01-01

    We established the cutoff value for plasma folic acid, using plasma homocyst(e)ine as the functional marker. To do this, we investigated the relationship of the plasma folic acid of 103 apparently healthy adults with their fasting plasma homocyst(e)ine and with their plasma homocyst(e)ine 6 h after

  20. Dietary determinants of plasma homocysteine concentrations

    NARCIS (Netherlands)

    Verhoef, P.; Groot, de C.P.G.M.

    2005-01-01

    Severe hyperhomocysteinemia is typically caused by rare enzymatic defects or by renal failure. In contrast, mild to moderate hyperhomocysteinemia chiefly results from suboptimal status of nutritional factors involved in homocysteine metabolism. Low dietary intake of folate is the most important

  1. Genetic and environmental influences on plasma homocysteine: results from a Danish twin study

    DEFF Research Database (Denmark)

    Bathum, Lise; Petersen, Inge; Christiansen, Lene;

    2007-01-01

    BACKGROUND: Increased plasma homocysteine has been linked to many clinical conditions including atherosclerosis and ischemic stroke. We assessed the genetic and environmental influences on homocysteine in adult twins and tested the influence of 3 candidate polymorphisms. METHODS: Homocysteine...... was analyzed in 1206 healthy twins, who were genotyped for 3 polymorphisms: MTHFR 677C>T, MTR 2756A>G, and NNMT (dbSNP: rs694539). To perform quantitative trait linkage analysis of the MTHFR locus, the genotyping was supplemented with 2 genetic markers localized on each site of the MTHFR locus. The twin data...... of the MTHFR locus is estimated to explain 53% (95% CI, 0.07-0.67) of the total phenotypic variation in persons 18-39 years old and 24% (95% CI, 0.00-0.39) in persons 40-65 years old, i.e., almost all additive genetic variance. CONCLUSIONS: Homocysteine concentrations have a high heritability that decreases...

  2. The J-shape association of ethanol intake with total homocysteine concentrations: the ATTICA study

    Directory of Open Access Journals (Sweden)

    Pitsavos Christos

    2004-10-01

    Full Text Available Abstract Background Epidemiological studies suggest a non-monotonic effect of alcohol consumption on cardiovascular risk, while there is strong evidence concerning the involvement of homocysteine levels on thrombosis. The aim of this work was to evaluate the association between usual ethanol consumption and homocysteine levels, in cardiovascular disease free adults. Methods From May 2001 to December 2002 we randomly enrolled 1514 adult men and 1528 women, without any evidence of cardiovascular disease, stratified by age – gender (census 2001, from the greater area of Athens, Greece. Among the variables ascertained we measured the daily ethanol consumption and plasma homocysteine concentrations. Results Data analysis revealed a J-shape association between ethanol intake (none, 48 gr per day and total homocysteine levels (mean ± standard deviation among males (13 ± 3 vs. 11 ± 3 vs. 14 ± 4 vs. 18 ± 5 vs. 19 ± 3 μmol/L, respectively, p Conclusion We observed a J-shape relationship between homocysteine concentrations and the amount of ethanol usually consumed.

  3. Effect of lifestyle factors on plasma total homocysteine concentrations in relation to MTHFR(C677T) genotype. Inter99 (7)

    DEFF Research Database (Denmark)

    Husemoen, L L N; Thomsen, T F; Fenger, M;

    2004-01-01

    OBJECTIVE: To examine the associations between various lifestyle factors--smoking habits, physical activity, dietary habits, coffee, tea, and alcohol consumption--and homocysteine (tHcy) in relation to MTHFR(C677T) genotype. DESIGN: Cross-sectional population-based study. SETTING: Residents...

  4. The Effects of Acute Exercise and Exercise Training on Plasma Homocysteine: A Meta-Analysis.

    Directory of Open Access Journals (Sweden)

    Rafael Deminice

    Full Text Available Although studies have demonstrated that physical exercise alters homocysteine levels in the blood, meta-analyses of the effects of acute exercise and exercise training on homocysteine blood concentration have not been performed, especially regarding the duration and intensity of exercise, which could affect homocysteine levels differently.The aim of this meta-analysis was to ascertain the effects of acute exercise and exercise training on homocysteine levels in the blood.A review was conducted according to the guidelines of the Preferred Reporting Items for Systematic Reviews and Meta-Analyses using the online databases PubMed, SPORTDiscus, and SciELO to identify relevant studies published through June 2015. Review Manager was used to calculate the effect size of acute exercise and exercise training using the change in Hcy plasmaserum concentration from baseline to post-acute exercise and trained vs. sedentary control groups, respectively. Weighted mean differences were calculated using random effect models.Given the abundance of studies, acute exercise trials were divided into two subgroups according to exercise volume and intensity, whereas the effects of exercise training were analyzed together. Overall, 22 studies with a total of 520 participants indicated increased plasma homocysteine concentration after acute exercise (1.18 μmol/L, 95% CI: 0.71 to 1.65, p < .01. Results of a subgroup analysis indicated that either long-term exercise of low-to-moderate intensity (1.39 μmol/L, 95% CI: 0.9 to 1.89, p < .01 or short-term exercise of high intensity (0.83 μmol/L, 95% CI: 0.19 to 1.40, p < .01 elevated homocysteine levels in the blood. Increased homocysteine induced by exercise was significantly associated with volume of exercise, but not intensity. By contrast, resistance training reduced plasma homocysteine concentration (-1.53 μmol/L, 95% CI: -2.77 to -0.28, p = .02, though aerobic training did not. The cumulative results of the seven

  5. Dietary determinants of plasma homocysteine concentrations

    NARCIS (Netherlands)

    Verhoef, P.; Groot, de C.P.G.M.

    2005-01-01

    Severe hyperhomocysteinemia is typically caused by rare enzymatic defects or by renal failure. In contrast, mild to moderate hyperhomocysteinemia chiefly results from suboptimal status of nutritional factors involved in homocysteine metabolism. Low dietary intake of folate is the most important nutr

  6. Prenatal diagnosis of methylmalonic aciduria by analysis of organic acids and total homocysteine in amniotic fluid

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    Background Methylmalonic aciduria (MMA )is the most frequent disease of organic aciduria in China.Various biochemical strategies are followed for the prenatal diagnosis of MMA.However,since fetuses affected by MMA have decreased excretion of methylmalonic acid,the difficulties of prenatal biochemical diagnosis are obvious.Gas chromatography mass spectrometry (GC/MS) and tandem mass spectrometry (ESI/MS/MS) have allowed us to identify the disease in affected fetuses.The aim of this study was to determine the value of analysis of organic acids and total homocysteine in amniotic fluid in prenatal diagnosis of MMA.Methods The clinical diagnoses and outcomes of nine probands with MMA and the prenatal diagnoses based on biochemical analysis of nine fetuses at risk for MMA were investigated.Amniotic fluid samples from pregnancies at risk for MMA and metabolically normal pregnancies were obtained at 16-24 weeks of gestation.Methylmalonic acid and methylcitric acid were measured by GC/MS,propionylcarnitine was analyzed by ESI/MS/MS,and total homocysteine was determined by fluorescence polarization immunoassay.Results In two pregnancies,high levels of methylmalonic acid,methylcitric acid,propionylcarnitine,and total homocysteine indicated combined MMA and homocysteinemia in the fetuses.One of the mothers continued pregnancy and received cobalamin supplement as prenatal treatment,and the other terminated her pregnancy.In one pregnancy,significantly elevated levels of methylmalonic acid,methylcitric acid,and propionylcarnitine,and normal level of total homocysteine was found indicating isolated MMA in the fetus;abortion was performed on this case.In the other six pregnancies,all the levels of the above mentioned metabolites were normal suggesting that the fetuses were not affected by MMA. The diagnoses were confirmed after delivery by testing urinary organic acids and plasma total homocysteine.Conclusions The metabolic abnormalities of MMA occur early in gestation.The level of

  7. Effects of Betaine Intake on Plasma Homocysteine Concentrations and Consequences for Health

    NARCIS (Netherlands)

    Olthof, M.R.; Verhoef, P.

    2005-01-01

    High plasma concentrations of homocysteine may increase risk of cardiovascular disease. Folic acid lowers plasma homocysteine by 25% maximally, because 5-methyltetrahydrofolate is a methyl donor in the remethylation of homocysteine to methionine. Betaine (trimethylglycine) is also a methyl donor in

  8. Plasma Homocysteine Is Associated with Increased Oxidative Stress and Antioxidant Enzyme Activity in Welders

    Directory of Open Access Journals (Sweden)

    Hung-Hsin Liu

    2013-01-01

    Full Text Available The purpose of this study was to examine the association of vitamin B6 status and plasma homocysteine with oxidative stress and antioxidant capacities in welders. Workers were divided into either the welding exposure group (n=57 or the nonexposure controls (n=42 based on whether they were employed as welders. There were no significant differences in vitamin B6 status and plasma homocysteine concentration between the welding exposure group and the nonexposure controls. The welding exposure group had significantly higher levels of oxidized low-density lipoprotein cholesterol and lower erythrocyte glutathione concentration and superoxide dismutase (SOD activities when compared to nonexposure controls. Plasma pyridoxal 5′-phosphate concentration did not correlate with oxidative stress indicators or antioxidant capacities in either group. However, plasma homocysteine significantly correlated with total antioxidant capacity (TAC (partial rs=-0.34, P<0.05 and erythrocyte SOD activities (partial rs=0.29, P<0.05 after adjusting for potential confounders in the welding exposure group. In the welding exposure group, adequate vitamin B6 status was not associated with oxidative stress or antioxidant capacities. However, elevated plasma homocysteine seemed to be a major contributing factor to antioxidant capacities (TAC and erythrocyte SOD activities in welders.

  9. Plasma Homocysteine Concentrations In Patients With Rheumatoid Arthritis

    Directory of Open Access Journals (Sweden)

    Vasiljevic Dragan

    2015-09-01

    Full Text Available In this study, we investigated the concentration of serum homocysteine (Hcy in patients with rheumatoid arthritis (RA compared with the control group and the connection between homocysteine and parameters of inflammation and disease activity. Sixty RA patients and 20 healthy controls were included in the study, and clinical examination and investigation were performed during which disease activity was assessed. Peripheral blood samples were used for all of the assays. Levels of Hcy were 33% higher in the RA patients than in the control subjects (mean +/− SD 11.79±3.72 μmol/L versus 8.90±1.38 μmol/L; p< 0.01. A significant correlation was found between parameters of inflammation (C-reactive protein and homocysteine in patients (r=0.322, p=0.012. Patients with high disease activity had a significantly greater increase in homocysteine (p<0.05. An increase in plasma homocysteine in RA patients is related to the parameters of inflammation and disease activity. Elevated Hcy levels occur commonly in patients with RA and may explain some of the increased cardiovascular mortality seen in RA patients.

  10. Effect of lifestyle factors on plasma total homocysteine concentrations in relation to MTHFR(C677T) genotype. Inter99 (7)

    DEFF Research Database (Denmark)

    Husemoen, L L N; Thomsen, T F; Fenger, M

    2004-01-01

    a Fluorescent Polarization Immuno Assay. MTHFR-genotype was determined by PCR and RFLP analysis. Information about lifestyle factors was obtained from a self-administered questionnaire. RESULTS: Daily smoking, less healthy dietary habits, and coffee drinking were associated with elevated tHcy concentrations......OBJECTIVE: To examine the associations between various lifestyle factors--smoking habits, physical activity, dietary habits, coffee, tea, and alcohol consumption--and homocysteine (tHcy) in relation to MTHFR(C677T) genotype. DESIGN: Cross-sectional population-based study. SETTING: Residents....... The effect of smoking was more pronounced in persons with the TT genotype and in women. The effect of beer consumption was more pronounced at younger than at older ages. CONCLUSIONS: Smoking status, dietary habits, coffee intake, wine, and beer consumption were major lifestyle determinants of tHcy. Changes...

  11. Associations of plasma phospholipid fatty acids with plasma homocysteine in Chinese vegetarians.

    Science.gov (United States)

    Huang, Tao; Yu, Xiaomei; Shou, Tianxing; Wahlqvist, Mark L; Li, Duo

    2013-05-01

    The association of plasma phospholipid (PL) fatty acid composition with plasma homocysteine (Hcy) in Chinese vegetarians is not understood. The main aim of the present study was to investigate the plasma PL fatty acid status, and its association with plasma Hcy in Chinese vegetarians and omnivores. A total of 103 male vegetarians and 128 male omnivores were recruited in Linyin Temple, Hangzhou. Plasma Hcy and PL fatty acid concentrations were determined by standard methods. Compared with omnivores, plasma PL n-3 PUFA (Pvegetarians. The prevalence of hyperhomocysteinaemia (HHcy) in vegetarians (26·47 %) was significantly higher than that in omnivores (13·28 %). In vegetarians, plasma PL 22 : 6n-3 (r − 0·257, P= 0·046) was significantly negatively associated with plasma Hcy. In omnivores, plasma PL 18 : 1n-7 (r 0·237, P= 0·030) was significantly positively associated with plasma Hcy. Plasma PL 22 : 6n-3 (r − 0·217, P= 0·048) was negatively associated with plasma Hcy in omnivores. Plasma PL SFA were positively associated with the prevalence of HHcy. It would seem appropriate for vegetarians to increase their dietary n-3 PUFA and decrease dietary SFA, and thus reduce the risk of HHcy.

  12. Relationship between Plasma Homocysteine Level and Glaucomatous Retinal Nerve Fiber Layer Defect.

    Science.gov (United States)

    Lee, Jae Yeun; Kim, Joon Mo; Kim, In Tae; Yoo, Chung Kwon; Won, Yu Sam; Kim, Jung Hoon; Kwon, Hyun Seok; Park, Ki Ho

    2017-06-01

    To investigate the association between plasma homocysteine levels and glaucomatous retinal nerve fiber layer (RNFL) defect in South Korean population. This retrospective cross-sectional study included subjects who underwent screening at Kangbuk Samsung Hospital Health Screening Center between August 2012 and July 2013. Subjects underwent physical examination and provided samples for laboratory analysis of homocysteine. Subjects were divided equally into four quartiles (Qs) based on plasma homocysteine level. Digital fundus photographs of both eyes were obtained. Determination of glaucomatous disc appearance was based on criteria set forth by the International Society of Geographical and Epidemiological Ophthalmology and based on the appearance of the RNFL and optic disc. Multivariate logistic regression models were used to define elevated glaucoma risk with P < 0.2 on univariate analysis. A total of 78,049 subjects were included; 76,093 subjects were male, and 1956 subjects were female. When analyzed by gender, the mean homocysteine level in the male group with glaucomatous RNFL defects (11.05 ± 3.80 µmol/L) was higher than those without RNFL defects (10.81 ± 4.12 µmol/L (P = 0.000, χ(2) test). Upon multifactorial logistic regression analysis adjusted for age, gender, creatinine, diabetes mellitus, hypertension, and hyperlipidemia, glaucomatous RNFL defects had a significant correlation with plasma homocysteine level. Based on the Q2 level, the odds ratio (OR) of Q3 was 1.267, while the OR of Q4 was 1.285 (95% CI = 1.067-1.505, 1.081-1.529, respectively, P for trend = 0.001). Our results suggest that homocysteine level is associated with the presence of glaucomatous RNFL defects.

  13. Serum homocysteine, folate, vitamin B12 and total antioxidant status in vegetarian children.

    Science.gov (United States)

    Ambroszkiewicz, J; Klemarczyk, W; Chełchowska, M; Gajewska, J; Laskowska-Klita, T

    2006-01-01

    The results of several studies point to the positive role of vegetarian diets in reducing the risk of diabetes, some cancers and cardiovascular diseases. However, exclusion of animal products in vegetarian diets may affect the cobalamin status and cause an elevation of the plasma homocysteine level. The aim of this study was to assess the effect of vegetarian diets on serum concentrations of homocysteine, folate, vitamin B12 and total antioxidant status (TAS) in children. The study included 32 vegetarians (including 5 vegans), age 2-10 years. Dietary constituents were analyzed using a local nutritional programme. Serum homocysteine, folate and vitamin B12 were determined with fluorescence and chemiluminescence immunoassays. The concentration of TAS was measured by a colorimetric method. Average daily energy intake and the percentage of energy from protein, fat and carbohydrates in the diets of the studied children were just above or similar to the recommended amounts. It could be shown that vegetarian diets contain high concentrations of folate. In vegan diets it even exceeds the recommended dietary allowance. Mean daily intake of vitamin B12 in the studied diets was adequate but in vegans was below the recommended range. The serum concentrations of homocysteine, folate, vitamin B12 and TAS in vegetarian children remained within the physiological range. The presented data indicate that vegetarian children, contrary to adults, have enough vitamin B12 in their diet (excluding vegans) and normal serum concentrations of homocysteine, folate and vitamin B12. Therefore, in order to prevent deficiencies in the future, close monitoring of vegetarian children (especially on a vegan diet) is important to make sure that they receive adequate quantities of nutrients needed for healthy growth.

  14. Effects of pyridoxine on growth performance and plasma aminotransferases and homocysteine of white pekin ducks.

    Science.gov (United States)

    Xie, Ming; Tang, Jing; Wen, Zhiguo; Huang, Wei; Hou, Shuisheng

    2014-12-01

    A dose-response experiment with seven supplemental pyridoxine levels (0, 0.66, 1.32, 1.98, 2.64, 3.30, and 3.96 mg/kg) was conducted to investigate the effects of pyridoxine on growth performance and plasma aminotransferases and homocysteine of White Pekin ducks and to estimate pyridoxine requirement for these birds. A total of 336 one-day-old male White Pekin ducks were divided to 7 experimental treatments and each treatment contained 8 replicate pens with 6 birds per pen. Ducks were reared in raised wire-floor pens from hatch to 28 d of age. At 28 d of age, the weight gain, feed intake, feed/gain, and the aspartate aminotransferase, alanine aminotransferase, and homocysteine in plasma of ducks from each pen were all measured. In our study, the pyridoxine deficiency of ducks was characterized by growth depression, decreasing plasma aspartate aminotransferase activity and increasing plasma homocysteine. The ducks fed vitamin B6-deficient basal diets had the worst weight gain and feed/gain among all birds and this growth depression was alleviated (ppyridoxine was supplemented to basal diets. On the other hand, plasma aspartate aminotransferase and homocysteine may be the sensitive indicators for vitamin B6 status of ducks. The ducks fed basal diets had much lower aspartate aminotransferase activity and higher homocysteine level in plasma compared with other birds fed pyridoxine-supplemented diets (ppyridoxine requirements of Pekin ducks from hatch to 28 days of age was 2.44 mg/kg for feed/gain and 2.08 mg/kg for plasma aspartate aminotransferase and the corresponding total requirements of this vitamin for these two criteria were 4.37 and 4.01 mg/kg when the pyridoxine concentration of basal diets was included, respectively. All data suggested that pyridoxine deficiency could cause growth retardation in ducks and the deficiency of this vitamin could be indicated by decreasing plasma aspartate aminotransferase activity and increasing plasma homocysteine.

  15. Correlation between Behavioural and Psychological Symptoms of Alzheimer Type Dementia and Plasma Homocysteine Concentration

    Directory of Open Access Journals (Sweden)

    Zhanjie Zheng

    2014-01-01

    Full Text Available The relationship between plasma homocysteine and behavioral and psychological symptoms of dementia (BPSD has not been specifically investigated in previous research. In this study, we compared plasma homocysteine (Hcy among 40 Alzheimer’s disease (AD patients with BPSD, 37 AD patients without BPSD, and 39 healthy controls. Our results evidenced that the plasma homocysteine levels in AD patients with BPSD and without BPSD were higher than healthy controls and that the plasma homocysteine concentration in AD patients with BPSD was the highest among the three groups. Significant correlation between plasma homocysteine concentration and cognitive decline and duration of dementia was observed, but there was no correlation between BPSD and cognitive dysfunction or duration of dementia. In conclusion, this study showed for the first time that BPSD were associated with plasma homocysteine concentration in Alzheimer's dementia, and the results supported that hyperhomocysteine may take part in the pathogenesis of BPSD.

  16. Common genetic loci influencing plasma homocysteine concentrations and their effect on risk of coronary artery disease

    NARCIS (Netherlands)

    Meurs, van J.B.J.; Pare, G.; Schwartz, S.M.; Hazra, A.; Tanaka, T.; Vermeulen, S.H.; Cotlarciuc, I.; Yuan, X.; Malarstig, A.; Bandinelli, S.; Bis, J.C.; Morn, H.; Brown, M.J.; Chen, C.; Chen, Y.D.; Clarke, R.J.; Dehghan, A.; Erdmann, J.; Ferrucci, L.; Hamsten, A.; Hofman, A.; Hunten, D.J.; Goel, A.; Johnson, A.D.; Kathiresan, S.; Kampman, E.; Kiel, D.P.; Kiemeney, L.A.; Chambers, J.C.; Kraft, P.; Lindemans, J.; McKnight, B.; Nelson, C.P.; O'Donnell, C.J.; Psaty, B.M.; Ridken, P.M.; Rivadeneira, F.; Rose, L.M.; Seedoif, U.; Siscovick, D.S.; Schunkert, H.; Selhub, J.; Ueland, P.M.; Vollenweiden, P.; Waeben, G.; Waterworth, D.M.; Watkins, H.; Witteman, J.C.M.; Heijen, den M.; Jacques, P.; Uitterlinden, A.G.; Koonet, J.S.; Rader, D.J.; Reilly, M.P.; Moose, V.; Chasman, D.I.; Samani, N.J.; Ahmadi, K.R.

    2013-01-01

    Background: The strong observational association between total homocysteine (tHcy) concentrations and risk of coronary artery disease (CAD) and the null associations in the homocysteinelowering trials have prompted the need to identify genetic variants associated with homocysteine concentrations and

  17. Study on the Relationship between Plasma Homocysteine and Acute Cerebral Vascular Disease

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    The levels of plasma homocysteine were determined by using high-performance liquid chromatographic method. It was found that plasma homocysteine levels were significantly higher in the patients with stroke than that in the controls. There was no correlation between plasma homocysteine levels and hypertension, smoking, concentrations of blood glucose or hypertriglyceridesemia. It was suggested that hyperhomocysteinemia may be an independent risk factor for acute cerebral vascular disease.

  18. Analysis of Plasma Homocysteine Levels in Patients with Unstable Angina

    Directory of Open Access Journals (Sweden)

    José Roberto Tavares

    2002-08-01

    Full Text Available OBJECTIVE - To determine the prevalence of hyperhomocystinemia in patients with acute ischemic syndrome of the unstable angina type. METHODS - We prospectively studied 46 patients (24 females with unstable angina and 46 control patients (19 males, paired by sex and age, blinded to the laboratory data. Details of diets, smoking habits, medication used, body mass index, and the presence of hypertension and diabetes were recorded, as were plasma lipid and glucose levels, C-reactive protein, and lipoperoxidation in all participants. Patients with renal disease were excluded. Plasma homocysteine was estimated using high-pressure liquid chromatography. RESULTS - Plasma homocysteine levels were significantly higher in the group of patients with unstable angina (12.7±6.7 µmol/L than in the control group (8.7±4.4 µmol/L (p<0.05. Among males, homocystinemia was higher in the group with unstable angina than in the control group, but this difference was not statistically significant (14.1±5.9 µmol/L versus 11.9±4.2 µmol/L. Among females, however, a statistically significant difference was observed between the 2 groups: 11.0±7.4 µmol/L versus 6.4±2.9 µmol/L (p<0.05 in the unstable angina and control groups, respectively. Approximately 24% of the patients had unstable angina at homocysteine levels above 15 µmol/L. CONCLUSION - High homocysteine levels seem to be a relevant prevalent factor in the population with unstable angina, particularly among females.

  19. Common genetic loci influencing plasma homocysteine concentrations and their effect on risk of coronary artery disease

    Science.gov (United States)

    The strong observational association between total homocysteine (tHcy) concentrations and risk of coronary artery disease (CAD) and the null associations in the homocysteine-lowering trials have prompted the need to identify genetic variants associated with homocysteine concentrations and risk of CA...

  20. Plasma homocysteine level in cardiac syndrome X and its relation with duke treadmill score.

    Science.gov (United States)

    Timurkaynak, Timur; Balcioglu, Serhat; Arslan, Ugur; Kocaman, Sinan A; Cengel, Atiye

    2008-03-01

    To investigate the plasma homocysteine level and the relationship between plasma homocysteine level and duke treadmill score (DTS) in cardiac syndrome X (CSX) patients. Seventy-nine patients (36 male, 43 female, mean age: 50 +/- 8.8 years) admitted to Gazi University Hospital, Ankara, Turkey with typical effort angina, positive stress test, and angiographically normal coronary arteries between January and September 2006 were included in this prospective and controlled study. Thirty asymptomatic patients (11 male, 19 female, mean age: 47.6 +/- 8.3 years) with 2 cardiovascular risk factors were chosen as a control group. Plasma homocysteine level was measured in both groups and DTS was calculated in the CSX group. Plasma homocysteine was measured with the AxSYM homocysteine immunoassay method in both groups. Plasma homocysteine level was higher in the CSX group compared to the control group (16.5 +/- 4.9 micromol/L, n=79, versus 12.4 +/- 4.1 micromol/L, n=30, p<0.001). The DTS was -2.7 +/- 5.3 in the CSX group. There was a negative correlation between the DTS and homocysteine levels in the CSX group. (r= -0.506, p<0.001). Plasma homocysteine level, which is known to cause endothelial dysfunction and microvascular ischemia were higher in CSX patients. Also, this increase in homocysteine level inversely correlated with the DTS, which represents the magnitude of ischemia.

  1. [Raised homocysteine plasma concentration in patients with heart failure: clinical significance].

    Science.gov (United States)

    Vizzardi, E; Nodari, S; Fiorina, C; Metra, M; Dei Cas, L

    2007-06-01

    Elevated plasma levels of homocysteine is associated with increased risk of thrombotic and atherosclerotic vascular disease. Several studies have demonstrated that hyper-homocysteinemia is an indipendent risk factor for vascular disease and is associated to heart failure. However there are no data regarding the association between homocysteine and various objective as well as subjective measures of heart failure. We hypothesized that plasma homocysteine is associated with clinical and echocardiographic signs of heart failure. On this ground we have analysed levels of homocysteine in patients with heart failure and possible correlation between these levels and clinical-functional pattern (NYHA class and ejection fraction). Plasma homocysteine levels were determined in 123 patients with dilated cardiomyopathy (59 males, 64 females, mean age 67+/-10 years, mean EF 31+/-11% and mean NYHA 2.4+/-0.9, 47 idiopatic and 76 postischemic cardiomyopathy) and 85 healthy control subjects (homogeneus group for sex and age). Patients with chronic renal failure, vitamin B12 and folate deficiency or factors affecting homocysteine plasma levels were escluded from this study. Homocysteine levels were determined in coded plasma samples by immunoenzimatic methods. Patients with heart failure had a higher homocysteine level (mcg/L) than control subjects (21.72+/-10.28 vs 12.9+/-6.86, pcolesterol (p<0,05) while no correlations were observed with hemodynamic (HR, BP), functional (ejection fraction) and other metabolic parameters (triglycerides). Serum homocysteine was lowest in control and increased with increasing NYHA class. In idiopatic cardiomiopathy the correlation between homocysteine and NYHA functional class, creatinine (p<0,001), fibrinogen (p<0,05) was confirmed; in postischemic cardiomiopathy a significant correlation with creatinine and NYHA class (p<0,001) and with triglycerides (p<0,05) was also found. Plasma homocysteine was directly related to NYHA class. This observation

  2. Elevated plasma homocysteine is associated with increased brain atrophy rates in older subjects with mild hypertension.

    Science.gov (United States)

    Narayan, Sunil K; Firbank, Michael J; Saxby, Brian K; Stansby, Gerard; Hansrani, Monica; O'Brien, John T; Ford, Gary A

    2011-01-01

    We determined using serial MR imaging whether raised plasma homocysteine levels are associated with increased brain atrophy, white matter lesion (WML) progression or incidence of silent brain infarcts (SBIs) in older hypertensive subjects. Brain atrophy rates (0.58 ± 0.48% per year, mean ± SD) were significantly correlated with homocysteine (β = 0.46, p = 0.001 homocysteine; β = 0.44, p = 0.007 homocysteine/folate/B12 models) but not with folate or B12 levels. Progression of WML (0.08 ± 0.16%) was not associated with homocysteine level (B = 0.01, p = 0.29). New SBIs were uncommon. In older hypertensive individuals, plasma homocysteine levels are associated with increased rates of whole-brain atrophy but not WML progression.

  3. Betaine concentration as a determinant of fasting total homocysteine concentrations and the effect of folic acid supplementation on betaine concentrations

    NARCIS (Netherlands)

    Boonstra, A.; Holm, P.I.; Ueland, P.M.; Olthof, M.R.; Clarke, R.; Verhoef, P.

    2005-01-01

    Background: Remethylation of homocysteine to methionine can occur through either the folate-dependent methionine synthase pathway or the betaine-dependent betaine-homocysteine methyltransferase pathway. The relevance of betaine as a determinant of fasting total homocysteine (tHcy) is not known, nor

  4. The relationship between MTHFR gene polymorphisms, plasma homocysteine levels and diabetic retinopathy in type 2 diabetes mellitus

    Institute of Scientific and Technical Information of China (English)

    孙家忠; 徐焱成; 朱宜莲; 鲁红云; 邓浩华; 范幼筠; 孙苏欣; 张颖

    2003-01-01

    Objective To evaluate the role of methylenetetrahydrofolate reductase (MTHFR) gene polymorphisms and plasma homocysteine levels in patients with type 2 diabetes mellitus and diabetic retinopathy (DR). Methods Total of 208 patients with type 2 diabetes mellitus and 57 controls were recruited into the study. MTHFR genetic C677T polymorphisms were determined by PCR-RFLP. Plasma total homocysteine levels were measured using high-performance liquid chromatography (HPLC) with fluorescence detection. Results The frequencies of MTHFR TT homogeneous type, CT heterogeneous type and allele T (28.18%, 41.82%, 49.09%) were significantly higher in the type 2 diabetes mellitus with diabetic retinopathy group than those without retinopathy (18.37%, 29.59%, 33.16%) and those of controls (17.54%, 28.07%, 31.58%). The presence of the T allele appeared to have a strong association with the development of diabetic retinopathy. The odds ratio was 1.94 with a 95% confidence interval of 1.31-2.88. Moreover, plasma homocysteine levels were remarkably higher in patients with TT or CT genotype than in patients with the CC genotype. Conclusion MTHFR gene C677T mutation associated with a predisposition to increased plasma homocysteine levels may be considered as a genetic risk factor for diabetic microangiopathy (such as DR) in Chinese patients with type 2 diabetes mellitus.

  5. Alleviation of Plasma Homocysteine Level by Phytoestrogen α-Zearalanol Might Be Related to the Reduction of Cystathionine β-Synthase Nitration

    Directory of Open Access Journals (Sweden)

    Hui Zhang

    2014-01-01

    Full Text Available Hyperhomocysteinemia is strongly associated with cardiovascular diseases. Previous studies have shown that phytoestrogen α-zearalanol can protect cardiovascular system from hyperhomocysteinemia and ameliorate the level of plasma total homocysteine; however, the underlying mechanisms remain to be clarified. The aim of this research is to investigate the possible molecular mechanisms involved in ameliorating the level of plasma homocysteine by α-zearalanol. By the successfully established diet-induced hyperhomocysteinemia rat models, we found that, after α-zearalanol treatment, the activity of cystathionine β-synthase, the key enzyme in homocysteine metabolism, was significantly elevated and level of nitrative stress in liver was significantly reduced. In correlation with this, results also showed a decreased nitration level of cystathionine β-synthase in liver. Together data implied that alleviation of plasma homocysteine level by phytoestrogen α-zearalanol might be related to the reduction of cystathionine β-synthase nitration.

  6. Microsatellite instability and the association with plasma homocysteine and thymidylate synthase in colorectal cancer

    DEFF Research Database (Denmark)

    Jensen, Lars Henrik; Lindebjerg, Jan; Crüger, Dorthe G.;

    2008-01-01

    The possible associations between microsatellite instability, homocysteine and thymidylate synthase were investigated in tumors and plasma from 130 patients with colorectal cancer. Other analyses included thymidylate synthase and 5,10-methylene-tetrahydrofolate reductase gene polymorphisms......, carcinoembryonic antigen, vitamin B12, and folate. Microsatellite instability of tumors was associated with higher levels of plasma homocysteine (p = 0.008) and higher protein expression of thymidylate synthase (p ... factors. CEA was not associated with neither homocysteine nor microsatellite instability. The data suggests that there is a more pronounced methyl unit deficiency in microsatellite instable tumors....

  7. Association between Plasma Homocysteine Levels and Neuronal Injury in HIV Infection

    Science.gov (United States)

    Ahlgren, Erika; Hagberg, Lars; Fuchs, Dietmar; Andersson, Lars-Magnus; Nilsson, Staffan; Zetterberg, Henrik; Gisslén, Magnus

    2016-01-01

    Objective To investigate the role of homocysteine in neuronal injury in HIV infection. Methods Using a cross-sectional design and archived samples, we compared concentrations of plasma homocysteine and cerebrospinal fluid (CSF) neurofilament light protein (NFL), a sensitive marker of neuronal injury, in 83 HIV-1-infected subjects without antiretroviral treatment. We also analyzed plasma vitamin B12, serum folate, CSF, and plasma HIV RNA, the immune activation marker neopterin in CSF and serum, and albumin ratio as a marker of blood-brain barrier integrity. Twenty-two subjects provided a second sample median of 12.5 months after antiretroviral treatment initiation. Results A significant correlation was found between plasma homocysteine and CSF NFL concentrations in untreated individuals (r = 0.52, p NFL in HIV-1-infected individuals. The correlation of plasma homocysteine and CSF NFL was also present in the group receiving antiretroviral therapy (r = 0.51, p = 0.016). Conclusion A correlation between plasma homocysteine and axonal injury, as measured by CSF NFL, was found in both untreated and treated HIV. While this study is not able to prove a causal link, homocysteine and functional B12/folate deficiency appear to play a role in neural injury in HIV-infected individuals. PMID:27441551

  8. Common genetic loci influencing plasma homocysteine concentrations and their effect on risk of coronary artery disease

    NARCIS (Netherlands)

    J.B.J. van Meurs (Joyce); G. Paré (Guillaume); S.M. Schwartz (Stephen); A. Hazra (Aditi); T. Tanaka; S.H.H.M. Vermeulen (Sita); I. Cotlarciuc (Ioana); X. Yuan (Xin); A. Mälarstig (Anders); S. Bandinelli (Stefania); J.C. Bis (Joshua); H.J. Blom (Henk); M.J. Brown (Morris); C. Chen (Christopher); R. Clarke (Robert); A. Dehghan (Abbas); J. Erdmann (Jeanette); L. Ferrucci; A. Hamsten (Anders); A. Hofman (Albert); D. Hunter (David); A. Goel (Anuj); A.D. Johnson (Andrew); S. Kathiresan (Sekar); E. Kampman (Ellen); D.P. Kiel (Douglas); L.A.L.M. Kiemeney (Bart); J.C. Chambers (John); P. Kraft (Peter); J. Lindemans (Jan); B. McKnight (Barbara); C.P. Nelson (Christopher P.); C.J. O'Donnell (Christopher); B.M. Psaty (Bruce); P.M. Ridker (Paul); F. Rivadeneira Ramirez (Fernando); L.M. Rose (Lynda); U. Seedorf (Udo); D.S. Siscovick (David); H. Schunkert (Heribert); J. Selhub (Jacob); P.M. Ueland (Per); P. Vollenweider (Peter); G. Waeber (Gérard); D. Waterworth (Dawn); H. Watkins (Hugh); J.C.M. Witteman (Jacqueline); M. den Heijer (Martin); P.F. Jacques (Paul); A.G. Uitterlinden (André); J.S. Kooner (Jaspal); D.J. Rader (Daniel); M.P. Reilly (Muredach); V. Mooser (Vincent); D.I. Chasman (Daniel); N.J. Samani (Nilesh); K.R. Ahmadi (Kourosh)

    2013-01-01

    textabstractBackground: The strong observational association between total homocysteine (tHcy) concentrations and risk of coronary artery disease (CAD) and the null associations in the homocysteinelowering trials have prompted the need to identify genetic variants associated with homocysteine concen

  9. Public health significance of elevated homocysteine.

    Science.gov (United States)

    Selhub, Jacob

    2008-06-01

    Homocysteine is a sulfur amino acid whose metabolism stands at the intersection of two pathways: remethylation, which requires folic acid and vitamin B12 coenzymes; and transsulfuration, which requires pyridoxal-5'-phosphate, the vitamin B6 coenzyme. Data from a number of laboratories suggest that mild elevations of homocysteine in plasma are a risk factor for occlusive vascular disease. In the Framingham studies, we have shown that plasma homocysteine concentration is inversely related to the intake and plasma levels of folate and vitamin B6 as well as vitamin B12 plasma levels. Almost two-thirds of the prevalence of high homocysteine is attributable to low vitamin status or intake. Elevated homocysteine concentrations in plasma are a risk factor for prevalence of extracranial carotid-artery stenosis > or = 25% in both men and women. Prospectively elevated plasma homocysteine is associated with increased total and cardiovascular mortality, increased incidence of stroke, increased incidence of dementia and Alzheimer's disease, increased incidence of bone fracture, and higher prevalence of chronic heart failure. It was also shown that elevated plasma homocysteine is a risk factor for preeclampsia and maybe neural tube defects (NTD). This multitude of relationships between elevated plasma homocysteine and diseases that afflict the elderly, pregnant women, and the embryo points to the existence ofa common denominator which may be responsible for these diseases. Whether this denominator is homocysteine itself or homocysteine is merely a marker, remains to be determined.

  10. Association between Plasma Homocysteine Levels and Neuronal Injury in HIV Infection.

    Directory of Open Access Journals (Sweden)

    Erika Ahlgren

    Full Text Available To investigate the role of homocysteine in neuronal injury in HIV infection.Using a cross-sectional design and archived samples, we compared concentrations of plasma homocysteine and cerebrospinal fluid (CSF neurofilament light protein (NFL, a sensitive marker of neuronal injury, in 83 HIV-1-infected subjects without antiretroviral treatment. We also analyzed plasma vitamin B12, serum folate, CSF, and plasma HIV RNA, the immune activation marker neopterin in CSF and serum, and albumin ratio as a marker of blood-brain barrier integrity. Twenty-two subjects provided a second sample median of 12.5 months after antiretroviral treatment initiation.A significant correlation was found between plasma homocysteine and CSF NFL concentrations in untreated individuals (r = 0.52, p < 0.0001. As expected, there was a significant inverse correlation between homocysteine and B12 (r = -0.41, p < 0.001 and folate (r = -0.40, p = < 0.001 levels. In a multiple linear regression analysis homocysteine stood out as an independent predictor of CSF NFL in HIV-1-infected individuals. The correlation of plasma homocysteine and CSF NFL was also present in the group receiving antiretroviral therapy (r = 0.51, p = 0.016.A correlation between plasma homocysteine and axonal injury, as measured by CSF NFL, was found in both untreated and treated HIV. While this study is not able to prove a causal link, homocysteine and functional B12/folate deficiency appear to play a role in neural injury in HIV-infected individuals.

  11. Correlation Between C677T and A1298C Mutations on the MTHFR Gene With Plasma Homocysteine Levels and Venous Thrombosis in Pregnant Women at Risk of Thrombosis

    Directory of Open Access Journals (Sweden)

    Kazem Ghaffari

    2015-12-01

    Full Text Available Background: Deep venous thrombosis (DVT is a common disease with a high morbidity, mortality and increase in miscarriages. Objectives: The purpose of this study was to assessment the correlation between C677T and A1298C mutations on the methylenetetrahydrofolate reductase (MTHFR gene with total plasma homocysteine levels and deep venous thrombosis in pregnant women at risk of thrombosis. Patients and Methods: In this case-control study, 120 pregnant women with risk of DVT and 100 pregnant women without risk of DVT were included in the study. Assay for identification of MTHFR mutations was carried out by PCR-RFLP. Total plasma homocysteine was measured by ELISA method. Results: Homozygous (MM mutations of MTHFR C677T and A1298C were not associated with DVT in pregnant women with and without DVT, respectively. Plasma homocysteine levels were significantly higher in pregnant women with DVT (18.3 ± 5.9 μmol/L than in the pregnant women without DVT (8.9 ± 6.4 μmol/L in C677T and A1298C mutations on the MTHFR gene, respectively (P = 0.021. Conclusions: Our results showed that MTHFR C677T and MTHFR A1289C polymorphisms are not connected with total plasma homocysteine levels in pregnant women with and without DVT. Also, plasma homocysteine levels were significantly higher in pregnant women with DVT.

  12. Elevated Plasma Homocysteine Level in Vascular Dementia Reflects the Vascular Disease Process

    Directory of Open Access Journals (Sweden)

    Karin Nilsson

    2013-02-01

    Full Text Available Background: Patients with vascular dementia (VaD exhibit particularly elevated levels of plasma total homocysteine (tHcy compared to patients with other psychogeriatric diseases. Methods: We investigated the main determinants (age, renal impairment, cobalamin/folate status and presence of extracerebral vascular disease of plasma tHcy in 525 patients with VaD. Furthermore, 270 patients with depression were used as a reference group to reveal the potential specificity of elevated plasma tHcy in patients with VaD. Results: Elevated plasma tHcy levels in patients with VaD could only partly be attributed to cobalamin/folate deficiency or renal impairment. Plasma tHcy might also be related to the vascular disease process since patients with depression and vascular disease exhibited similar plasma tHcy levels to patients with VaD. Conclusion: Our findings suggest that elevated plasma tHcy might be a sensitive marker for the vascular disease process in patients with VaD and that the level also is a reflection of changes in the other main determinants of plasma tHcy.

  13. Effect of L-dopa on plasma homocysteine in elderly patients with Parkinson’ s disease

    Institute of Scientific and Technical Information of China (English)

    王红梅

    2006-01-01

    Objective To explore the effect of L-dopa on plasma homocysteine and folic acid in patients with Parkinsons’s disease (PD). Methods Twenty eight elderly PD patients and thirty normal subjects were enrolled in this group. The homocysteine, cobalamin and folate were examined in normal group and in PD group before treatment and after being treated with L-dopa for six months respec-

  14. Should plasma homocysteine be used as a biomarker of venous thromboembolism? A case-control study.

    Science.gov (United States)

    Ducros, Véronique; Barro, Claire; Yver, Jacqueline; Pernod, Gilles; Polack, Benoît; Carpentier, Patrick; Desruet, Marie-Dominique; Bosson, Jean-Luc

    2009-10-01

    Mild or moderate hyperhomocysteinemia as a risk factor for venous thrombosis is still a matter of debate. The strength of this study is to bring a body of elements to evaluate whether hyperhomocysteinemia should be used as a biomarker for venous thromboembolism (VTE). These elements consist of a biological evaluation of several hematological risk factors, and an original control group made of patients with a negative Doppler ultrasonography. A total of 151 cases and 155 controls were included. Total plasma homocysteine level, MTHFR C677T polymorphism, inherited abnormalities of the natural anticoagulant system as well as plasma folate and cobalamin levels were determined. A total of 41 (27.2 %) of cases and only 9 (5.8%) of controls had at least one of the coagulation defects studied. No significant difference was observed for total homocysteine levels between the 2 groups: median (interquartile range) = 8.3 (7.2-10.8) micromol/L for cases and 8.4 (7-10.9) micromol/L for controls. We found significantly more plasma folates and/or cobalamin deficiencies in controls (18.3%) than in cases (8.6%). After adjustment for several variables significantly related to risk factors of VTE, hyperhomocysteinemia (>13.2 micromol/L) was not found statistically associated with VTE: odds ratio 1.36 (95% confidence interval, 0.52-3.54). The prevalence of the homozygous 677TT polymorphism in the MTHFR gene was not increased in cases compared with controls. Mild or moderate hyperhomocysteinemia does not seem to be a strong determinant in VTE not only when the control group does not exclusively include healthy persons but also in investigated disease-free (thromboembolic disease) controls.

  15. Long-term consumption of a raw food diet is associated with favorable serum LDL cholesterol and triglycerides but also with elevated plasma homocysteine and low serum HDL cholesterol in humans

    National Research Council Canada - National Science Library

    Koebnick, Corinna; Garcia, Ada L; Dagnelie, Pieter C; Strassner, Carola; Lindemans, Jan; Katz, Norbert; Leitzmann, Claus; Hoffmann, Ingrid

    2005-01-01

    ...) on serum lipids and plasma vitamin B-12, folate, and total homocysteine (tHcy). In a cross-sectional study, the lipid, folate, vitamin B-12, and tHcy status of 201 adherents to a raw food diet...

  16. Long-Term Consumption of a Raw Food Diet Is Associated with Favorable Serum LDL Cholesterol and Triglycerides but Also with Elevated Plasma Homocysteine and Low Serum HDL Cholesterol in Humans1,2

    National Research Council Canada - National Science Library

    Corinna Koebnick; Ada L Garcia; Pieter C Dagnelie; Carola Strassner

    2005-01-01

    ...) on serum lipids and plasma vitamin B-12, folate, and total homocysteine (tHcy). In a cross-sectional study, the lipid, folate, vitamin B-12, and tHcy status of 201 adherents to a raw food diet...

  17. Folate network genetic variation, plasma homocysteine, and global genomic methylation content: a genetic association study

    Directory of Open Access Journals (Sweden)

    Wernimont Susan M

    2011-11-01

    Full Text Available Abstract Background Sequence variants in genes functioning in folate-mediated one-carbon metabolism are hypothesized to lead to changes in levels of homocysteine and DNA methylation, which, in turn, are associated with risk of cardiovascular disease. Methods 330 SNPs in 52 genes were studied in relation to plasma homocysteine and global genomic DNA methylation. SNPs were selected based on functional effects and gene coverage, and assays were completed on the Illumina Goldengate platform. Age-, smoking-, and nutrient-adjusted genotype--phenotype associations were estimated in regression models. Results Using a nominal P ≤ 0.005 threshold for statistical significance, 20 SNPs were associated with plasma homocysteine, 8 with Alu methylation, and 1 with LINE-1 methylation. Using a more stringent false discovery rate threshold, SNPs in FTCD, SLC19A1, and SLC19A3 genes remained associated with plasma homocysteine. Gene by vitamin B-6 interactions were identified for both Alu and LINE-1 methylation, and epistatic interactions with the MTHFR rs1801133 SNP were identified for the plasma homocysteine phenotype. Pleiotropy involving the MTHFD1L and SARDH genes for both plasma homocysteine and Alu methylation phenotypes was identified. Conclusions No single gene was associated with all three phenotypes, and the set of the most statistically significant SNPs predictive of homocysteine or Alu or LINE-1 methylation was unique to each phenotype. Genetic variation in folate-mediated one-carbon metabolism, other than the well-known effects of the MTHFR c.665C>T (known as c.677 C>T, rs1801133, p.Ala222Val, is predictive of cardiovascular disease biomarkers.

  18. Serum Total Homocysteine Level: A True Cardiovascular Risk Factor or an Acute Phase Reactant Protein?

    Directory of Open Access Journals (Sweden)

    Dr. Malik Asif Humayoun et al.

    2011-08-01

    Full Text Available Atherosclerosis is the leading cause of death in the developed world1.In Pakistan; the disease seems to follow an accelerated course with ischaemic events occurring a decade earlier than those reported worldwide2. While many risk factors of cardiovascular diseases are well established, many are still under evaluation; like homocysteine, which is now being considered an independent risk factor for cardiovascular diseases3.Homocysteine is a sulfur containing amino acid which is not our dietary constituent but is formed by metabolism of methionine, another amino acid present in our daily protein diet. In case of excess formation of homocysteine as compared to its consumption, it appears in urine if levels are too high3. Normal plasma homocysteine concentration ranges from 5 to 15μmol/litre. Of this, almost 75% is bound to proteins, especially albumin, through disulfide bond. Classification of hyperhomocysteinemia described by Kang SS 4 is followed widely.Moderate hyperhomocysteinemia (15 to 30 μmol/litreIntermediate hyperhomocysteinemia (30 to 100μmol/litreSevere hyperhomocysteinemia (>100 μmol/litre

  19. Acetylcysteine reduces plasma homocysteine concentration and improves pulse pressure and endothelial function in patients with end-stage renal failure

    DEFF Research Database (Denmark)

    Scholze, Alexandra; Rinder, Christiane; Beige, Joachim;

    2004-01-01

    Increased oxidative stress, elevated plasma homocysteine concentration, increased pulse pressure, and impaired endothelial function constitute risk factors for increased mortality in patients with end-stage renal failure.......Increased oxidative stress, elevated plasma homocysteine concentration, increased pulse pressure, and impaired endothelial function constitute risk factors for increased mortality in patients with end-stage renal failure....

  20. Low Dose Betaine Supplementation Leads to Immediate and Long Term Lowering of Plasma Homocysteine in Healthy Men and Women

    NARCIS (Netherlands)

    Olthof, M.R.; Vliet, T. van; Boelsma, E.; Verhoef, P.

    2003-01-01

    High plasma homocysteine is a risk for cardiovascular disease and can be lowered through supplementation with 6 g/d of betaine. However, dietary intake of betaine is ∼0.5-2 g/d. Therefore, we investigated whether betaine supplementation in the range of dietary intake lowers plasma homocysteine conce

  1. May modifications of human plasma proteins stimulated by homocysteine and its thiolactone induce changes of hemostatic function of plasma in vitro?

    Science.gov (United States)

    Olas, Beata; Kołodziejczyk, Joanna; Malinowska, Joanna

    2010-06-01

    Homocysteine (Hcys) may be implicated in different diseases, especially in cardiovascular illnesses. The most reactive form of Hcys is its cyclic thioester-homocysteine thiolactone (HTL), which is formed in plasma and represents up to 0.29% of plasma total Hcys. Recently, it has been observed that Hcys and HTL may modify plasma proteins, including albumin, hemoglobin or fibrinogen, but the role of this process is not yet well known. The aim of our study in vitro was to investigate the modifications of human plasma total proteins after incubation with the reduced form of Hcys in concentrations 10-100 micromol/l, and HTL in concentrations 1-0.1 micromol/l, which correspond to levels found in human plasma during hyperhomocysteinemia in vivo. The aim of our study was also to explain the effects of Hcys and HTL on coagulation activity of human plasma. We showed that in model system in vitro Hcys and HTL change the level of thiol, amino and carbonyl groups in plasma total proteins. Moreover, our studies reported that not only Hcys (10-100 micromol/l), but also HTL (at lower concentrations than Hcys) modulates the coagulation properties of human plasma.

  2. Evaluation of chemiluminescence method for the analysis of plasma homocysteine and comparison with HPLC method in children samples

    OpenAIRE

    Thais Moura Gascón; Fernanda Schindler; Claudia Giorgia Bronzatti de Oliveira; Fabiola Isabel Suano Souza; Sonia Hix; Roseli Oselka Sacardo Sarni; Ana Paula Arantes Bacan; Vania D’Almeida; Auro del Giglio; Fernando Luiz Affonso Fonseca

    2010-01-01

    ABSTRACT Objective: To compare the results for homocysteine concentration using chemiluminescence and HPLC methods in samples from school-age children. In addition, to determine the reference values for patients of this age group and assess the real prognostic value of homocysteine in healthy children. Methods: A prospective observational study was undertaken to determine plasma levels of homocysteine using two different assays, HPLC and chemiluminescence, in 185 samples from school-age chi...

  3. Correlation Between C677T and A1298C Mutations on the MTHFR Gene With Plasma Homocysteine Levels and Venous Thrombosis in Pregnant Women at Risk of Thrombosis

    OpenAIRE

    Kazem Ghaffari; Ali Ghasemi; Abbas Ghotaslou; Mohsen Mohammadi; Zeynal Salmanpour

    2015-01-01

    Background: Deep venous thrombosis (DVT) is a common disease with a high morbidity, mortality and increase in miscarriages. Objectives: The purpose of this study was to assessment the correlation between C677T and A1298C mutations on the methylenetetrahydrofolate reductase (MTHFR) gene with total plasma homocysteine levels and deep venous thrombosis in pregnant women at risk of thrombosis. Pati...

  4. Study of the Correlation between Plasma Homocysteine and Coronary Artery Disease

    Institute of Scientific and Technical Information of China (English)

    靳立军; 董太明; 陈志红; 陈铁峰; 余细勇; 方咸宏; 吴书林; 陈纪言; 乌汉东

    2004-01-01

    Objectives This paper is to investigate the correlation between plasma total homocysteine (tHcy) and coronary artery disease(CAD).Methods Using high performance liquid chromatograph to determine the level of plasma tHcy in 215 cases, and they were selective coronary angiography.107 cases were determined to have CAD with at least one vessel was narrowed < 50%. 108 cases were nonnarrowed, and they were listed as controls. Their 10 parameters such as sex, age, body height, body weight and blood lipid etc. were no statistical difference between two groups. Results The plasma tHcy 11.20(±5.56) μmol/L of the CAD group and 11.46(±5.50) of the control group, between them there was no statistical difference (P > 0.5). 12.17 (±6.25) μmol/L tHcy concentration of the male was significant higher than 9.60(±5.10) of the female (P < 0.001). Conclusions None of correlation between the plasma tHcy and CAD can be found, and the tHcy of male is higher than that of female.

  5. Contribution of caffeine to the homocysteine-raising effect of coffee : a randomized controlled trial in humans

    NARCIS (Netherlands)

    Verhoef, P.; Pasman, W.J.; Vliet, van T.; Urgert, R.; Katan, M.B.

    2002-01-01

    Background: A high plasma total homocysteine concentration is associated with increased risk of cardiovascular disease. Consumption of unfiltered or filtered coffee raises total homocysteine concentrations in healthy volunteers. The responsible compound, however, is unknown. Objective: The objective

  6. Contribution of caffeine to the homocysteine-raising effect of coffee : a randomized controlled trial in humans

    NARCIS (Netherlands)

    Verhoef, P.; Pasman, W.J.; Vliet, van T.; Urgert, R.; Katan, M.B.

    2002-01-01

    Background: A high plasma total homocysteine concentration is associated with increased risk of cardiovascular disease. Consumption of unfiltered or filtered coffee raises total homocysteine concentrations in healthy volunteers. The responsible compound, however, is unknown. Objective: The objective

  7. Effects of oral N-acetylcysteine on plasma homocysteine and whole blood glutathione levels in healthy, non-pregnant women.

    Science.gov (United States)

    Roes, Eva Maria; Raijmakers, Maarten T M; Peters, Wilbert H M; Steegers, Eric A P

    2002-05-01

    Oral N-acetylcysteine supplementation in nine young healthy females induced a quick and highly significant decrease in plasma homocysteine levels and an increase in whole blood concentration of the antioxidant glutathione. N-acetylcysteine impresses as an efficient drug in lowering homocysteine concentration and might be beneficial for individuals with hyperhomocysteinemia who are at increased risk of cardiovascular disease.

  8. Plasma B vitamins, homocysteine and their relation with bone loss and hip fracture in elderly men and women

    Science.gov (United States)

    Elevated homocysteine is a strong risk factor for osteoporotic fractures among elders, yet it may be a marker for low B vitamin status. Objective: To examine the associations of plasma concentrations of folate, vitamin B12, vitamin B6 and homocysteine with bone loss and hip fracture risk in elderly...

  9. Effect of B vitamin supplementation on plasma homocysteine levels in celiac disease

    Institute of Scientific and Technical Information of China (English)

    Muhammed Hadithi; Chris JJ Mulder; Frank Stam; Joshan Azizi; J Bart A Crusius; Amado Salvador Pe(n)a; Coen DA Stehouwer; Yvo M Smulders

    2009-01-01

    AIM: To investigate the effect of vitamin supplements on homocysteine levels in patients with celiac disease. METHODS: Vitamin B6, folate, vitamin B12, and fasting plasma homocysteine levels were measured in 51 consecutive adults with celiac disease [median (range) age 56 (18-63) years; 40% men, 26 (51%) had villous atrophy, and 25 (49%) used B-vitamin supplements] and 50 healthy control individuals matched for age and sex. Finally, the C677T polymorphism of 5,10-methylene tetrahydrofolate reductase (MTHFR) was evaluated in 46 patients with celiac disease and all control individuals. RESULTS: Patients with celiac disease and using vitamin supplements had higher serum vitamin B6 ( P = 0.003), folate ( P < 0.001), and vitamin B12 ( P = 0.012) levels than patients who did not or healthy controls ( P = 0.035, P < 0.001, P = 0.007, for vitamin B6, folate, and vitamin B12, respectively). Lower plasma homocysteine levels were found in patients using vitamin supplements than in patients who did not ( P = 0.001) or healthy controls ( P = 0.003). However, vitamin B6 and folate, not vitamin B12, were significantly and independently associated with homocysteine levels. Twenty-four (48%) of 50 controls and 23 (50%) of 46 patients with celiac disease carried the MTHFR thermolabile variant T-allele ( P = 0.89). CONCLUSION: Homocysteine levels are dependent on Marsh classification and the regular use of B-vitamin supplements is effective in reduction of homocysteine levels in patients with celiac disease and should be considered in disease management.

  10. Effect of genetic variants associated with plasma homocysteine levels on stroke risk.

    Science.gov (United States)

    Cotlarciuc, Ioana; Malik, Rainer; Holliday, Elizabeth G; Ahmadi, Kourosh R; Paré, Guillaume; Psaty, Bruce M; Fornage, Myriam; Hasan, Nazeeha; Rinne, Paul E; Ikram, M Arfan; Markus, Hugh S; Rosand, Jonathan; Mitchell, Braxton D; Kittner, Steven J; Meschia, James F; van Meurs, Joyce B J; Uitterlinden, Andre G; Worrall, Bradford B; Dichgans, Martin; Sharma, Pankaj

    2014-07-01

    Elevated total plasma homocysteine (tHcy) levels are known to be associated with increased risk of ischemic stroke (IS). Given that both tHcy and IS are heritable traits, we investigated a potential genetic relationship between homocysteine levels and stroke risk by assessing 18 polymorphisms previously associated with tHcy levels for their association with IS and its subtypes. Previous meta-analysis results from an international stroke collaborative network, METASTROKE, were used to assess association of the 18 tHcy-associated single-nucleotide polymorphisms (SNPs) in 12 389 IS cases and 62 004 controls. We also investigated the associations in regions located within 50 kb from the 18 tHcy-related SNPs and the association of a genetic risk score, including the 18 SNPs. One SNP located in the RASIP1 gene and a cluster of 3 SNPs located at and near SLC17A3 were significantly associated with IS (Pstroke subtypes, the sentinel SNP located upstream of MUT was significantly associated with small-vessel disease (P=0.0022), whereas 1 SNP located in MTHFR was significantly associated with large-vessel disease (P=0.00019). A genetic risk score, including the 18 SNPs, did not show significant association with IS or its subtypes. This study found several potential associations with IS and its subtypes: an association of an MUT variant with small-vessel disease, an MTHFR variant with large-vessel disease, and associations of RASIP1 and SLC17A3 variants with overall IS. © 2014 American Heart Association, Inc.

  11. Plasma homocysteine levels in cycling, pregnant, and spayed bitches.

    Science.gov (United States)

    Trisolini, C; Minoia, G; Manca, R; Rizzo, A; Robbe, D; Valentini, L; Sciorsci, R L

    2008-10-01

    The aim of this study was to evaluate the physiological range of homocysteine (Hcy) exhibited by bitches during the follicular (pro-oestrus), luteal (dioestrus) and anoestrus phases of cycling animals, and in pregnant and spayed bitches. The lowest concentrations of Hcy were observed during dioestrus (3.2+/-1.27micromol/L) and in pregnant bitches (3.9+/-1.72micromol/L), and the highest concentrations during anoestrus (7.8+/-0.6micromol/L) and in spayed bitches (12.1+/-5.16micromol/L).

  12. [Influence of vegetarian diet on serum values of homocysteine and total antioxidant status in children].

    Science.gov (United States)

    Chełchowska, Magdalena; Ambroszkiewicz, Jadwiga; Klemarczyk, Witold; Gajewska, Joanna; Ołtarzewski, Mariusz; Laskowska-Klita, Teresa

    2010-09-01

    The vegetarian diet may play a preventive role in the development of chronic diseases such as coronary heart and cardiovascular disease. However increase of homocysteine (Hcy) concentration in peoples avoiding animal products may contribute to an increased atherosclerotic risk in these subjects. Recent evidence has suggested that role of hyperhomocysteinemia in atherogenesis is associated with process of autooxidation, which can promote the production of hydroxyl radicals, resulting in oxidative modification of low density lipoprotein and endothelium injury. The oxidant-antioxidant imbalance depends not only on the amount of enhanced free oxygen species but also insufficiency of antioxidant defence system. Total antioxidant status (TAS) expresses capacity for scavenging of free radicals minimizes oxidative damage. The aim of this study was to asses concentrations of homocysteine and total antioxidant status in serum of children on vegetarian and omnivorous diet. We also studied levels of vitamin A (retinol) and vitamin E (alpha-tocopherol) particular components of TAS. The study included 35 children, aged 5-16 who had been referred to Institute of Mother and Child for dietary consultation. From those, 17 were lacto-ovo-vegetarians and 18 omnivores. Dietary constituents were analyzed using the nutritional programme Dietetyk2 and completed with supplementation data. Concentration of homocysteine was estimated in serum with fluorescence polarization immunoassay and TAS by colorimetric method. Levels of vitamin A and E were determined using high-pressure liquid chromatography (HPLC). The mean concentration of homocysteine was similar in both studied groups (vegetarians: 6.13 +/- 1.01 micromol/l vs. omnivores: 5.45 +/- 0.98 micromol/l). In vegetarian children serum level of TAS was significantly lower (1.21 +/- 0.06 mmol/I) as compared to those in non-vegetarian ones (1.30 +/- 0.05 mmol/l, p vegetarians were lower than observed in omnivores group, but only in case of

  13. Erythrocyte folate, plasma folate and plasma homocysteine during normal pregnancy and postpartum: a longitudinal study comprising 404 danish women

    DEFF Research Database (Denmark)

    Milman, N; Byg, KE; Hvas, Anne-Mette

    2006-01-01

    OBJECTIVE: To assess folate and homocysteine status during normal pregnancy and postpartum in a longitudinal setting. METHODS: This study, performed in 1995-1996, comprised 404 healthy pregnant Danish Caucasian women residential in Copenhagen County. Women taking folic acid tablets or vitamin B12...... injections were not included. Dietary multivitamin supplements containing folic acid 100 microg or vitamin B12 1 microg, taken by 34%, were discontinued at inclusion. Participants had normal renal function. Folate status [erythrocyte (Ery-) folate, plasma (P-) folate, P-homocysteine] was measured at 18, 32....../L increased during pregnancy from 0.7% to 19.0% postpartum (P pregnancy from 0.5% to 17...

  14. Influence of vitamin-optimized plasma homocysteine cutoff values on the prevalence of hyperhomocysteinemia in healthy adults

    NARCIS (Netherlands)

    Fokkema, Margaretha; Weijer, JM; Dijck-Brouwer, DAJ; van Doormaal, JJ; Muskiet, FAJ

    BACKGROUND: Hyperhomocysteinemia is a cardiovascular disease (CVD) risk factor. We determined plasma homocysteine (Hcy) reference values at optimized vitamin status and investigated their influence on the prevalence of hyperhomocysteinemia in healthy adults. Results were compared with those obtained

  15. Erythrocyte folate, plasma folate and plasma homocysteine during normal pregnancy and postpartum: a longitudinal study comprising 404 danish women

    DEFF Research Database (Denmark)

    Milman, N; Byg, KE; Hvas, Anne-Mette;

    2006-01-01

    OBJECTIVE: To assess folate and homocysteine status during normal pregnancy and postpartum in a longitudinal setting. METHODS: This study, performed in 1995-1996, comprised 404 healthy pregnant Danish Caucasian women residential in Copenhagen County. Women taking folic acid tablets or vitamin B12...... status (defined as P-folate homocysteine >13 micromol/L) was 0%, 0%, 1.2%, and 8.4% at 18, 32 and 39 wk of gestation and 8 wk postpartum, respectively. CONCLUSION: Low folate status occurs among Danish pregnant women, especially in late pregnancy and postpartum during lactation. Despite...... injections were not included. Dietary multivitamin supplements containing folic acid 100 microg or vitamin B12 1 microg, taken by 34%, were discontinued at inclusion. Participants had normal renal function. Folate status [erythrocyte (Ery-) folate, plasma (P-) folate, P-homocysteine] was measured at 18, 32...

  16. Hydrogen sulfide decreases the plasma lipid peroxidation induced by homocysteine and its thiolactone.

    Science.gov (United States)

    Olas, Beata; Kontek, Bogdan

    2015-06-01

    Hydrogen sulfide (H2S) has been investigated widely in recent years. H2S plays a variety of roles in different biological systems, including cardiovascular system. It is the final product of amino acids metabolism, which contains sulfur-cysteine and homocysteine (Hcy). In human plasma, there are several various forms of homocysteine: free Hcy, protein-bound Hcy (S-linked, and N-linked), and homocysteine thiolactone (HTL). Our previous works have shown that both Hcy in the reduced form and its thiolactone may modify fibrinolysis, coagulation process, and biological activity of blood platelets. Moreover, we have observed that HTL, like its precursor-Hcy stimulated the generation of superoxide anion radicals (O 2 (-•) ) in blood platelets. The aim of our study in vitro was to establish the influence of sodium hydrosulfide (NaHS, as a fast-releasing H2S donor; at tested concentrations: 10-1000 µM) on the plasma lipid peroxidation induced by the reduced Hcy (at final concentrations of 0.01-1 mM) and HTL (at final concentrations of 0.1-1 µM). Our results indicate that 10 and 100 µM NaHS decreased the lipid peroxidation in plasma treated with 1 mM Hcy or 1 µM HTL (when NaHS and Hcy/HTL were added to plasma together). The protective effect of 10 and 100 µM NaHS against the lipid peroxidation in plasma preincubated with 1 mM Hcy or 1 µM HTL was also observed. Considering the data presented in this study, we suggest that the lipid peroxidation (induced by different forms of homocysteine) may be reduced by hydrogen sulfide.

  17. The level of plasma homocysteine in patients with non-alcoholic fatty liver disease in combination with type 2 diabetes

    Directory of Open Access Journals (Sweden)

    V. F. Orlovskiy

    2015-06-01

    Full Text Available Non-alcoholic fatty liver disease (NAFLD is one of the major causes of chronic diseases of the hepatobiliary zone. Aim. In order to explore new pathogenetic factors of NAFLD examined the level of plasma homocysteine in 110 patients. Methods and results. Patients were divided into two groups - the isolated NAFLD and in combination with Diabetes mellitus type 2. Found a significant increase in homocysteine level in all patients with NAFLD compared with the control group. High homocysteine concentration was in patients with comorbidity. There was positive correlation between levels of homocysteine and lipid components and cytolytic syndrome in all patients. Conclusion. The data obtained allow us to consider homocysteine as one of the factors in the pathological changes development in the liver.

  18. High performance liquid chromatography method for rapid and accurate determination of homocysteine in plasma and serum

    DEFF Research Database (Denmark)

    Vester, Birte; Rasmussen, K

    1991-01-01

    Determination of homocysteine in plasma or serum for evaluation of cobalamin and folate deficiency is becoming an important diagnostic procedure. Accurate, rapid and low cost methods for measuring homocysteine are therefore required. We have improved an HPLC method and made it suitable for clinical...... application. The more important changes are the addition of an internal standard, mercaptopropionylglycine, and the use of a plasma/serum based calibration material. The method consists of the following steps: reduction of the sample with tri-n-butylphosphine, precipitation of proteins, derivatisation...... with ammonium 7-fluorobenzo-2-oxa-1,3-diazole-4-sulphonate, and HPLC separation followed by fluorescence detection. The linearity of the assays is established and the coefficient of variation is 3.0%. Stability studies show that blood samples must be cooled or centrifuged immediately after venipuncture...

  19. [Lowering plasma homocysteine with vitamins B6, B12, and folic acid. Effect on lipids concentration in patients with secondary hyperlipoproteinemia type IV, with and without Lovastatina treatment].

    Science.gov (United States)

    Garcés P, Antonio; Morón de Salim, Alba; Garcés, Anthony; Garcés, Albert

    2006-03-01

    The concentration of plasma homocysteine was diminished by the oral use of vitamins B6 (300 mg/day), B12 (250 microg/day) and folic acid (10 mg/day), and the effect was studied in the lipids of patient with hiperlipoproteinemia secondary type IV, during 120 days, in 30 patients, 45 to 70 years old, with myocardial heart attack. They were divided in group A (n=15) without treatment with Lovastatin and group B (n=15) with Lovastatin. Basal homocysteine concentration was 17.4 +/- 1.0 micromol/L and 16.7 +/- 1.0 micromol/L for the groups A and B respectively, diminishing 24% at the end of the experimental time, in both groups. Total cholesterol decreased below 220 mg/dl, while the triglycerides diminished 25.4 mg/dl and 27.0 mg/dl in groups A and B respectively, by each micromol/L of homocysteine catabolissed. Low density lipoproteins (LDL) and very low density (VLDL) diminished significantly (p < 0.005), while the high-density (HDL) increased 1.0 mg/dl in group A and 1.15 mg/dl in group B, for each micromol/L of homocysteine metabolized, lowering the coronary risk factor in 28.5% group A and 35.9% group B. We concluded that these vitamins decreased plasma homocysteine concentration, promoting the lowering of lipids and lipoprotein concentratation in this type of patients; while Lovastatin doesn't reduce homocysteine, but it had a synergic effect with the vitamins, dicreasing the lipid concentration, in group B.

  20. Preliminary report on plasma homocysteine and hormonal variations in infertile women in Lagos, Nigeria

    OpenAIRE

    Vincent Oluseye Osunkalu; MAKWE, Christian C; Oluwatosin Jonadab Akinsola; Adediran Adewumi; Oluseun Funke Akomolafe

    2015-01-01

    Background: The relationship between infertility and hormonal variations has been variously documented, but little has been reported on the interactions between hormonal factors, homocysteine (Hcy), and female infertility. Objective: This study aimed to evaluate the relationship between plasma Hcy levels and hormonal variations in infertile women. Materials and Methods: This descriptive cross-sectional study was carried out among eligible infertile and fertile women seeking care at the Lagos ...

  1. Distribution and Determinants of Plasma Homocysteine Levels in Rural Chinese Twins across the Lifespan

    OpenAIRE

    Yuelong Ji; Xiangyi Kong; Guoying Wang; Xiumei Hong; Xin Xu; Zhu Chen; Tami Bartell; Xiping Xu; Genfu Tang; Fanfan Hou; Yong Huo; Xiaobin Wang; Binyan Wang

    2014-01-01

    Plasma homocysteine (Hcy) is a modifiable, independent risk factor for cardiovascular disease (CVD) and is affected by both environmental and genetic factors. This study aimed to describe the gender- and age-specific distribution of Hcy concentration for 1117 subjects aged 10–66 years, a subset of a community-based rural Chinese twin cohort. In addition, we examined environmental and genetic contributions to variances in Hcy concentration by gender and age groups. We found that the distributi...

  2. Determination of plasma total homocysteine and cysteine using HPLC with fluorescence detection and an ammonium 7-fluoro-2, 1, 3-benzoxadiazole-4-sulphonate (SBD-F) derivatization protocol optimized for antioxidant concentration, derivatization reagent concentration, temperature and matrix pH.

    Science.gov (United States)

    Daskalakis, I; Lucock, M D; Anderson, A; Wild, J; Schorah, C J; Levene, M I

    1996-01-01

    A sensitive HPLC-fluorescence method for determining total endogenous plasma homocysteine (Hcy), cysteine (Cys) and cysteinylglycine (Cys-Gly) following derivatization with ammonium 7-fluoro 2,1,3-benzoxadiazole-4-sulphonate (SBD-F) is described. Quantitation utilizes an internal standard, 2-mercaptoethylamine. The derivatization procedure has been optimized for concentration of SBD-F, reducing agent (tributylphosphine) and temperature. Findings indicate that values for plasma determinations vary according to the nature of the matrix in which calibration standards are made up. If quantitation is based on a peak height ratio, then standards should be made up in either pH 7.4 phosphate buffered saline or plasma taking into account the endogenous thiol concentration. These findings are based on calibration data, and 30 plasma samples quantified using thiol standards made up in plasma, pH 7.4 and pH 9.5 buffers. By defining how this matrix/pH effect influences thiol quantitation, it should be possible to make a more meaningful comparison of Hcy measurements between laboratories. The chromatographic separation was investigated at several mobile-phase pH values with the following conditions ascertained to be optimal: a mobile phase consisting of 5% (v/v) acetonitrile in 0.1 M KH2PO4, pH 2.15 was run at a flow rate of 0.5 mL/min. It was used in conjunction with a Supelco LC-18 base deactivated analytical column (150 x 4.6 cm i.d. 3 microM bonded silica). The internal standard and thiols were measured by fluorescence detection at 385 nm excitation and 515 nm emmission. Plasma levels are easily measured in a 100 microL volume. Storage for 2 months at -20 degrees C resulted in no deterioration of thiols. Furthermore, no difference in thiol levels was observed between bloods collected in lithium heparin and EDTA. Collected blood should, however, be separated as soon as possible to avoid red cell metabolism of Hcy which was observed in a case of hyperhomocysteinemia. Once

  3. LINE-1 DNA methylation is inversely correlated with cord plasma homocysteine in man: a preliminary study.

    Science.gov (United States)

    Fryer, Anthony A; Nafee, Tamer M; Ismail, Khaled M K; Carroll, William D; Emes, Richard D; Farrell, William E

    2009-08-16

    Folic acid supplementation during pregnancy has known beneficial effects. It reduces risk of neural tube defects and low birth weight. Folate and other one-carbon intermediates might secure these clinical effects via DNA methylation. However, most data on the effects of folate on the epigenome is derived from animal or in vitro models. We examined the relationship between cord blood methylation and maternal folic acid intake, cord blood folate and homocysteine using data from 24 pregnant women. Genome-wide methylation was determined by the level of methylation of LINE-1 repeats using Pyrosequencing. We show that cord plasma homocysteine (p = 0.001, r = -0.688), but not serum folate or maternal folic acid intake, is inverse correlated with LINE-1 methylation. This remained significant after correction for potential confounders (p = 0.004). These data indicate that levels of folate-associated intermediates in cord blood during late pregnancy have significant consequences for the fetal epigenome.

  4. Correlation Between C677T and A1298C Mutations on the MTHFR Gene With Plasma Homocysteine Levels and Venous Thrombosis in Pregnant Women at Risk of Thrombosis

    OpenAIRE

    Ali Ghasemi; Kazem Ghaffari; Abbas Ghotaslou; Mohsen Mohammadi; Zeynal Salmanpour

    2015-01-01

    Background: Deep venous thrombosis (DVT) is a common disease with a high morbidity, mortality and increase in miscarriages. Objectives: The purpose of this study was to assessment the correlation between C677T and A1298C mutations on the methylenetetrahydrofolate reductase (MTHFR) gene with total plasma homocysteine levels and deep venous thrombosis in pregnant women at risk of thrombosis. Patients and Methods: In this case-control study, 120 pregnant women with risk of DVT and 100 preg...

  5. A folate-rich diet is as effective as folic acid from supplements in decreasing plasma homocysteine concentrations

    Directory of Open Access Journals (Sweden)

    2005-04-01

    Full Text Available Background & Aims: At least 500 μg of folic acid are required daily to treat hyperhomocysteinemia. To reach this amount by dietary changes alone may be difficult because food has a low folic acid content and bioavailability. No studies have compared the effects of similar amounts of additional folate derived from a combination of folate-rich and fortified foods or folic acid from supplements on plasma total homocysteine (tHcy concentrations, which was the aim of this study. Methods: Twenty male patients with hyperhomocysteinemia and coronary artery disease were included in a randomized, crossover intervention trial. Patients were treated daily with a combination of foods containing approximately 500 μg of folate or with one 500 μg capsule of synthetic folic acid over two five-week periods separated by a five-week wash-out period. Results: Plasma folate increased markedly (p

  6. The association between high plasma homocysteine levels and lower bone mineral density in Slovak women: the impact of vegetarian diet.

    Science.gov (United States)

    Krivosíková, Zora; Krajcovicová-Kudlácková, Marica; Spustová, Viera; Stefíková, Kornélia; Valachovicová, Martina; Blazícek, Pavel; Nĕmcová, Tatiana

    2010-04-01

    A long-term vegetarian diet is generally poor in vitamin B group. The lack of vitamin B(12) together with vitamin B(6) and folate deficiency is closely related to homocysteine metabolism. Hyperhomocysteinemia was found to be associated with increased bone turnover markers and increased fracture risk. Thus, hyperhomocysteinemia, vitamin B(12) and folate deficiency may be regarded as novel risk factors for micronutrient deficiency-related osteoporosis. To assess the possible impact of a vegetarian diet on bone mineral density in cohort of Slovak vegetarian women. Fasting serum glucose, albumin, calcium, phosphorous and creatinine as well as bone markers, serum vitamin B(12), folate and plasma levels of total homocysteine were assessed in two nutritional groups (vegetarians vs. nonvegetarians) of apparently healthy women (age range 20-70 years). Bone mineral density of the femoral neck, trochanter, total femur and lumbar spine was measured in all subjects. Vegetarians had a significantly lower weight (p vegetarian food intake (p Vegetarians had a significantly lower TrFBMD (p vegetarian diet seem to be at higher risk of osteoporosis development than nonvegetarian women.

  7. Plasma homocysteine is associated with aortic arterial stiffness but not wave reflection in Chinese hypertensive subjects.

    Directory of Open Access Journals (Sweden)

    Wenkai Xiao

    Full Text Available OBJECTIVE: Elevated plasma total homocysteine (tHcy acts synergistically with hypertension to exert a multiplicative effect on cardiovascular diseases risk. The aim of this study was to determine the relationship between tHcy concentration and blood pressure, and to evaluate the role of plasma tHcy in arterial stiffness and wave reflection in hypertension. METHODS: In this cross-sectional study, a community-based sample of 1680 subjects (mean age 61.6 years was classified into four groups according to tHcy level (<21.6 vs. ≥ 21.6 µmol/l and blood pressure (hypertensive vs. normotensive. Levels of plasma tHcy and other biochemical parameters (e.g., lipids, glucose were determined. Central arterial blood pressure, reflected pressure wave, and carotid-femoral pulse wave velocity (cf-PWV were assessed by tonometry within 2 days of obtaining the blood specimen. RESULTS: Neither peripheral nor central blood pressure differed according to tHcy levels in normotensive and hypertensive subjects. Differences in cf-PWV according to tHcy were observed only in hypertensive subjects; differences in cf-PWV in normotensive subjects were not significant after adjusting for confounding factors. Central augmentation index did not differ according to tHcy level in either normotensive or hypertensive subjects. Results of univariate analysis revealed significant correlations between blood pressure parameters and tHcy concentration only among normotensive subjects; however, these correlations were not significant in a partial correlation analysis. Results of multiple regression analysis showed that plasma tHcy levels were independently correlated with cf-PWV in hypertensive subjects (β = 0.713, P = 0.004. The independent relationship between tHcy and central augmentation index was not significant by further multiple analyses in normotensive or hypertensive individuals. CONCLUSIONS: Plasma tHcy level is strongly and independently correlated with arterial

  8. Plasma homocysteine in adolescents depends on the interaction between methylenetetrahydrofolate reductase genotype, lipids and folate: a seroepidemiological study

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    Gil Ángel

    2009-10-01

    Full Text Available Abstract Background Many publications link high homocysteine levels to cardiovascular disease. In Spain there is little information on the prevalence of hyperhomocysteinaemia and associated vitamin factors among the general population, and less still among children. Cardiovascular risk factors in the childhood population may be related to the appearance of cardiovascular disease at adult age. The aim of this study is to establish a definition of hyperhomocysteinaemia in adolescents and to analyze the influence of vitamin and metabolic factors in homocysteine levels in this population group. Methods Descriptive, cross-sectional epidemiological study to estimate serum homocysteine, vitamin B12 and folate levels, as well as plasma total, HDL- and LDL- cholesterol in a schoolgoing population aged 13 to 17 years in Madrid, Spain. Spearman correlation analysis was performed to ascertain quantitative comparison, Pearson's χ2 test (frequency Results Based on the classic values for definition of hyperhomocysteinaemia in adults, prevalence of hyperhomocysteinaemia in the study population was: 1.26% for 15 μmol/L; and 2.52% for 12 μmol/L. Deficits in HDL cholesterol and serum folate levels yielded adjusted Odds Ratios (OR for hyperhomocysteinemia of 2.786, 95% CI (1.089-7.126, and 5.140, 95% CI (2.347-11.256 respectively. Mutation of the methylenetetrahydrofolate reductase (MTHFR C677T genotype also raises the risk of hyperhomocysteinaemia (CC→CT: OR = 2.362; 95% CI (1.107-5.042 CC→TT: OR = 6.124, 95% CI (2.301-16.303 Conclusion A good definition of hyperhomocysteinaemia in adolescents is the 90th percentile, equivalent to 8.23 μmol/L. Risk factors for hyperhomocysteinaemia are cHDL and folate deficiency, and the MTHFR C677T mutant genotype. No significant effect could be assessed for vitamin B12. Coexistence of all three factors increases the risk of suffering from hyperhomocysteinaemia 87-fold.

  9. The elevated homocysteine stimulates changes of haemostatic function of plasma isolated from breast cancer patients.

    Science.gov (United States)

    Kedzierska, Magdalena; Malinowska, Joanna; Glowacki, Rafal; Olas, Beata; Bald, Edward; Jeziorski, Arkadiusz; Piekarski, Janusz

    2011-09-01

    The aim of our study was to explain the effect of elevated homocysteine (measured by HPLC) on haemostatic activity of plasma from breast cancer patients (fibrin polymerization and lysis; the thrombin and prothrombin time), because homocysteine (Hcys) induces changes in haemostasis, as well blood clotting as fibrinolysis. Patients were hospitalized in Department of Oncological Surgery, Medical University of Lodz, Poland. All patients have not had preadjuvant therapy, and samples from patients were taken before surgery. We observed that changes of selected parameters of haemostatic properties of plasma, e.g., the prothrombin time and thrombin time were prolonged in plasma from invasive breast cancer when compared with the control group (healthy subjects) and patients with benign breast diseases. Our results showed also that the correlation between the increased amount of Hcys and changes of selected parameters of haemostasis in invasive breast cancer patients exists. Considering the data presented in this study, we suggest that the elevated Hcys in invasive breast cancer patients may induce the changes of haemostatic properties of plasma isolated from these patients.

  10. Plasma Homocysteine and Gene Polymorphisms Associated with the Risk of Hyperlipidemia in Northern Chinese Subjects

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    LEI HUANG; XIAO-MING SONG; WEN-LI ZHU; YONG LI

    2008-01-01

    To examine the relationship between occurrence of hypedipidemia,plasma homocysteine and polymorphisms of methylenetetra hydrofolate reductase (MTHFR) gene and methionine synthase (MS) gene.Methods A total of 192 hyperlipidemia patients were selected and divided into hypercholesterolemia group,hypertriglyceridemia group,and combined hyperlipidemia group.Another 208 normal individuals were selected as control.Total plasma homocysteine (tHcy)concentration was measured by high-performance liquid chromatography (HPLC).Lipid profiles were measured for all subjects.The polymorphisms of MTHFR gene C677T and MS gene A2756G were analyzed by PCR-RFLP.Results The tHcy concentration in the combined hyperlipidemia patients was significantly higher than that in the control (15.95 μmol/L vs 13.43 μmol/L,P<0.05).The prevalence of hyperhomocysteinemia (Hhcy) in the combined hyperlipidemia group was significantly higher than that in the control (42.2% vs 23.0%,P=0.015),with the odds ratio (OR) of 3.339 (95%CI:1.260-8.849).The hyperlipidemia patients with Hhcy had a higher concentration of total cholesterol (TC) than that in the normal they patients (5.67±0.95 mmol/L vs 5.47±0.92 mmol/L,P=0.034).There was no significant difference in genotype or allele frequencies of MTHFR C677T between the hyperlipidemic and control groups.The hyperlipidemia patients with MTHFR CT/TT genotype had a higher concentration of triglyceride (TG) than those with CC genotype (2.24±1.75 mmol/L vs 1.87±0.95 mmol/L,P<0.05).Individuals with CT/TT genotype had a higher concentration of tHey than those with 677CC genotype both in the hyperlipidemia group (12.61±1.24 μmol/L vs 11.20±1.37 μmol/L,P<0.05) and in the control group (14.04±1.48 μmol/L vs 12.61±1.24 μmol/L,P<0.05).The percentage of MS 2756 GG/AG genotype in the combined hyperlipidemia group was significantly higher than that in the control (26.7% vs 13.0%,P=0.012),with the OR of 3.121 (95%CI:1.288-7.651).The hyperlipidemia patients

  11. No evidence of a causal relationship between plasma homocysteine and type 2 diabetes: A Mendelian randomization study

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    Jitender eKumar

    2015-03-01

    Full Text Available Background: Several observational studies have shown an association between increased circulating homocysteine and risk of type 2 diabetes (T2D. We aimed to assess whether this relation is causal using genetic data from large populations of individuals of European descent.Methods: We investigated the association of between homocysteine concentrations with and blood glucose, plasma insulin, T2D in the PIVUS cohort (n=1,016. A score of five previously published single nucleotide polymorphisms (SNPs from genes involved in homocysteine metabolism were utilized as genetic instrument for homocysteine concentrations. The effect estimate of this genetic score with T2D was determined using results from the DIAbetes Genetics Replication And Meta-analysis (DIAGRAM consortium (including 34,840 cases and 114,981 controls. Further, the effects of the genetic score with fasting glucose and insulin were determined using results from the Meta-Analyses of Glucose and Insulin-related traits Consortium (MAGIC (up to 38,238 non-diabetic participants. Results: The genetic score provided a strong instrument for homocysteine concentrations (P=2.7x10-143, F=650. In the PIVUS cohort, we found an association of homocysteine with fasting insulin (β=0.0564 [95% CI 0.0210, 0.09088], P=0.001, but not with incident diabetes. We did not find any evidence of a causal effect of homocysteine onwith fasting glucose, fasting insulin or T2D (P>0.05 for all analyses when using data from DIAGRAM or MAGIC studies.Conclusion: No evidence of a causal relationship of levels of plasma homocysteine with fasting glucose, fasting insulin or T2D was observed.

  12. Low dose betaine supplementation leads to immediate and long term lowering of plasma homocysteine in healthy men and women

    NARCIS (Netherlands)

    Olthof, M.R.; Vliet, van T.; Boelsma, E.; Verhoef, P.

    2003-01-01

    High plasma homocysteine is a risk for cardiovascular disease and can be lowered through supplementation with 6 g/d of betaine. However, dietary intake of betaine is similar to0.5-2 g/d. Therefore, we investigated whether betaine supplementation in the range of dietary intake lowers plasma homocyste

  13. Plasma folate but not vitamin B(12) or homocysteine concentrations are reduced after short-term vitamin B(6) supplementation.

    Science.gov (United States)

    Bosy-Westphal, A; Holzapfel, A; Czech, N; Müller, M J

    2001-01-01

    Adverse effects of high vitamin B(6) intake include peripheral neuropathy. Recent studies focussing on the reduction of plasma homocysteine as a risk factor for vascular disease showed that vitamin B(6) reduces plasma folate levels. The significance of this finding is unclear. We therefore analyzed plasma folate and basal homocysteine levels as well as the response to an oral methionine loading test in 8 healthy individuals before and after a controlled supplementation with oral doses of 25 mg pyridoxine for 10 days. Plasma pyridoxal phosphate increased from 40.6 +/- 13.6 to 426.8 +/- 200.3 nmol/l (p < 0.001), whereas plasma folate decreased from 6.3 +/- 1.6 to 4.6 +/-1.5 ng/ml (p < 0.01), respectively. Plasma vitamin B(12) and basal homocysteine levels remained unchanged (234.0 +/- 27.8 vs. 217.1 +/- 50.4 pg/ml and 10.9 +/- 4.8 vs. 10.1 +/- 3.6 micromol/l). There was no significant effect of vitamin B(6) supplementation on the area under methionine and homocysteine concentration versus time curve. Significant correlations were found between pre- and post-supplement levels of folate as well as PLP levels (r = 0.73, p < 0.05; r = 0.75, p < 0.05). These data suggest that a dose of 25 mg vitamin B(6) supplemented for 10 days reduces plasma folate but did not affect basal and postprandial homocysteine levels suggesting (1) a normal cellular availability of folate or (2) a compensation of impaired homocysteine remethylation by increased transsulfuration.

  14. Are dietary choline and betaine intakes determinants of total homocysteine concentration?

    Science.gov (United States)

    Elevated homocysteine concentrations are associated with an increased risk of cardiovascular disease and a decline in cognitive function. Intakes of choline and betaine, as methyl donors, may affect homocysteine concentrations. The objective was to examine whether choline and betaine intakes, assess...

  15. Association of blood lead (Pb and plasma homocysteine: a cross sectional survey in Karachi, Pakistan.

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    Mohsin Yakub

    Full Text Available BACKGROUND: High blood lead (Pb and hyperhomocysteinemia have been found to be associated with cardiovascular disease (CVD. Mean blood Pb and mean plasma homocysteine levels have been reported to be high in Pakistani population. The objective of the present study was to assess the relationship of blood Pb to the risk of hyperhomocysteinemia in a low income urban population of Karachi, Pakistan. METHODOLOGY/PRINCIPAL FINDINGS: In a cross sectional survey, 872 healthy adults (355 males, 517 females; age 18-60 years were recruited from a low income urban population of Karachi. Fasting venous blood was obtained and assessed for blood Pb and plasma/serum homocysteine, folate, pyridoxal phosphate (PLP, a coenzymic form of vitamin B6 and vitamin B12. The study population had median (IQR blood Pb of 10.82 microg/dL (8.29-13.60. Prevalence of high blood Pb (levels>10 microg/dL was higher in males compared to females (62.5% males vs 56% females; p value=0.05. Mean+/-SD/median (IQR value of plasma homocysteine was significantly higher in the highest quartile of blood Pb compared to the lowest quartile 16.13+/-11.2 micromol/L vs 13.28+/-9.7micromol/L/13.15 (10.33-17.81 micromol/L vs 11.09 (8.65 14.31 micromol/L (p value<0.001. Daily consumption of fruit juice had a positive influence on both levels of plasma homocysteine and blood Pb. Compared with the lowest quartile of blood Pb, the OR for hyperhomocysteinemia was 1.69 (95% CI, 1.00 to 2.85 for the fourth quartile when the model was adjusted for age, gender, folate and vitamin B12. CONCLUSIONS/SIGNIFICANCE: This study showed a relationship between blood Pb and hyperhomocysteinemia in a general population of Karachi, Pakistan. The harmful effect of Pb on cardiovascular system could be due to its association with hyperhomocysteinemia.

  16. Central somatosensory conduction slowing in adults with isolated elevated plasma level of homocysteine

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    Jin Jun Luo

    2015-03-01

    Full Text Available Aim: Elevated plasma level of homocysteine (eHcy is a recognized risk factor for dementia. However, whether the central conduction is affected in patients with an isolated eHcy is unknown. In this study, we addressed whether central conduction is altered in adults with eHcy. Methods: Evoked potential studies including somatosensory (SSEP, visual (VEP and brainstem auditory evoked potentials (BAEP, were performed to evaluate central conduction in patients with isolated eHcy. Results: Nine SSEP, 7 VEP, and 6 BAEP were studied in 9 patients with eHcy (age: 63.3 ± 7.5 years old, mean ± standard deviation, male/female: 4/5. SSEP with median nerve stimulation was delayed in peak latency of N9 (5/9/55.6%, abnormal/total subjects/percentage, N13 (7/9/77.8%, N20 (6/9/66.7%, and/or interpeak latency of N9-N13 (5/9/55.6%, N13-N20 (5/9/55.6%, and N9-N20 (4/9/44.4%. There was one delayed P100 latency (1/7/14.3% in 7 VEP. BAEP was within normal limits in all the 6 subjects tested. Conclusion: Our pilot study provided neurophysiologic evidence of central conduction slowness in patients with eHcy, which may be due to a large diameter fiber dysfunction within the somatosensory, but not the visual and auditory, white matter pathway. The central conduction slowing in eHcy may be relevant to the pathophysiologic background for slowing the central processing.

  17. Recent insights into the molecular genetics of the homocysteine metabolism.

    Science.gov (United States)

    Födinger, M; Wagner, O F; Hörl, W H; Sunder-Plassmann, G

    2001-02-01

    The homocysteine plasma level is determined by non-genetic and genetic factors. In recent years evidence has accumulated that the total homocysteine plasma level of patients under different forms of renal replacement therapy is influenced by a common mutation at nucleotide position 677 of the gene coding for 5,10-methylenetetrahydrofolate reductase (MTHFR 677C-->T). Furthermore, compound heterozygosity for the 677T allele and a novel A-->C polymorphism at nucleotide position 1298 of MTHFR is suggested to correlate with a decrease of folate plasma concentrations. Because polymorphisms of genes coding for proteins involved in the metabolism of homocysteine may contribute to elevated total homocysteine plasma concentrations, molecular genetic analyses of the homocysteine pathways experienced a drift towards screening for candidate genes with a putative relationship to total homocysteine plasma levels. One example is the cloning of the FOLR1 gene coding for the folate-binding protein (Folbp1), which has recently been inactivated in mice, thus representing an elegant model to investigate the consequence on the homocysteine metabolism. Furthermore, the recent characterization of the CUBN gene encoding the intrinsic factor-vitamin B12 receptor (cubilin) provides a basis to identify the causative mutations in patients suffering from a hereditary syndrome of hyperhomocysteinemia that presents with megaloblastic anemia and proteinuria. This review focuses on recent insights into the molecular genetics of MTHFR, FOLR1, and CUBN, and their relationships to the metabolism of the amino acid homocysteine.

  18. Elevated plasma homocysteine is positively associated with age independent of C677T mutation of the methylenetetrahydrofolate reductase gene in selected Egyptian subjects

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    2004-10-01

    Full Text Available This study aimed to evaluate the plasma homocysteine (tHcy and folate levels as well as the methylenetetrahydrofolate reductase (MTHFR C677T mutation in Egyptian subjects. Fasting total homocysteine (tHcy and the (MTHFR C677T mutation were evaluated in 50 healthy young control males (age 35-50 years, Gp1, 50 elderly males age ranged between 50-75 years without any cardiovascular diseases (Gp2 and 50 age matched elderly male patients (Gp3 with myocardial infarction. There was a significant elevation of plasma tHcy in the patients group and Gp2 compared to the young control group (Gp1. The total plasma homocysteine (tHcy in the control group, Gp2 and the patients group were 17.99 ± 9.76, 39.9 ± 20.06 and 43.8 ± 13.13 μmol/L respectively. The frequency of the TT genotype was 12% in the patient group compared with 8 % in the young healthy controls and elderly subjects (Gp2. The CT genotype constituted 36%, 48% and 44% in the control group, Gp2 and the patients group respectively. There was no significant difference in the occurrence of the TT genotype between the studied groups. Plasma tHcy correlated positively with age, total cholesterol, urea, creatinine, glucose levels and carotid intimal thickness (CIT. Conclusion: The MTHFR mutation does not seem to be associated with either high tHcy or the occurrence of cardiovascular diseases in the studied patients. However, elevated plasma tHcy level positively correlates with age in the studied subjects.

  19. 血浆同型半胱氨酸水平与血管性痴呆的相关性研究%Study on correlation between plasma level of homocysteine and vascular dementia.

    Institute of Scientific and Technical Information of China (English)

    刘玲; 刘琦; 杨志勇

    2013-01-01

    Objective To analyze and explore the correlation between plasma level of homocysteine and vascular dementia. Methods A total of 92 patients were divided into observation group and control group, 42 of them were suffered from vascular dementia and 50 patients with cerebral infarction without dementia. The plasma levels of homocysteine were compared between these two groups, and the relationship between plasma level of homocysteine and severity of vascular dementia had been studied. Results The plasma level of homocysteine in patients with vascular dementia was higher than that of patients with dementia. The plasma level of homocysteine in patients with severe vascular dementia was higher than that of patients with moderate vascular dementia, and plasma level of homocysteine in patients with moderate vascular dementia was higher than that of patients with mild vascular dementia. Conclusion The relationship between plasma level of homocysteine and the occurrence of vascular dementia is very close, and physicians can treat patients with vascular dementia by elimination of factors causing the elevation of plasma level of homocysteine.%目的 探讨血浆同型半胱氨酸(Hcy)水平与血管性痴呆的相关性.方法 将患者分为观察组(42例)与对照组(50例),分别为血管性痴呆患者和脑梗死非痴呆性患者,对两组患者的Hcy水平进行比较,并对不同病情程度血管性痴呆患者的Hcy水平予以比较.结果 观察组患者的Hcy浓度较之对照组相对更高;另外,重度血管性痴呆患者的的Hcy浓度较之中度和轻度血管性痴呆患者明显更高;中度血管性痴呆患者的Hcy浓度较之轻度血管性痴呆患者明显要高,差异均有显著性(P<0.05).结论 血浆Hcy水平与血管性痴呆的发生有着密切关系,临床可通过消除诱发血浆Hcy水平升高的因素治疗血管性痴呆.

  20. Effects of physical activity and training programs on plasma homocysteine levels: a systematic review.

    Science.gov (United States)

    e Silva, Alexandre de Souza; da Mota, Maria Paula Gonçalves

    2014-08-01

    Homocysteine is an amino acid produced in the liver that, when present in high concentrations, is thought to contribute to plaque formation and, consequently, increased risk of cardiovascular disease. However, daily physical activity and training programs may contribute to controlling atherosclerosis. Given that physical exercise induces changes in protein and amino acid metabolism, it is important to understand whether homocysteine levels are also affected by exercise and to determine possible underlying mechanisms. Moreover, regarding the possible characteristics of different training programs (intensity, duration, repetition, volume), it becomes prudent to determine which types of exercise reduce homocysteine levels. To these ends, a systematic review was conducted to examine the effects of daily physical activity and different training programs on homocysteine levels. EndNote(®) was used to locate articles on the PubMed database from 2002 to 2013 with the keyword combinations "physical activity and homocysteine", "training and homocysteine", and/or "exercise and homocysteine". After 34 studies were identified, correlative and comparative studies of homocysteine levels revealed lower levels in patients engaged in greater quantities of daily physical activity. Regarding the acute effects of exercise, all studies reported increased homocysteine levels. Concerning intervention studies with training programs, aerobic training programs used different methods and analyses that complicate making any conclusion, though resistance training programs induced decreased homocysteine levels. In conclusion, this review suggests that greater daily physical activity is associated with lower homocysteine levels and that exercise programs could positively affect homocysteine control.

  1. Association of Plasma Homocysteine with Self-Reported Sleep Apnea Is Confounded by Age: Results from the National Health and Nutrition Examination Survey 2005-2006

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    Tushar P. Thakre

    2012-01-01

    Full Text Available High levels of plasma homocysteine are implicated in the pathogenesis of cardiovascular diseases especially if accompanied by sleep apnea, but a direct pathogenetic link between plasma homocysteine levels and obstructive sleep apnea is debatable. This association can have far-reaching public health implications considering the inverse association between folate and plasma homocysteine. We used data from the 2005-2006 cycle of the National Health and Nutrition Examination Survey (NHANES to test the hypothesized associations. Of the 4490 subjects included in analysis, 177 reported sleep apnea. Age-standardized and design-effect-corrected prevalence rates were differential across gender, plasma homocysteine, and red cell folate status. Plasma homocysteine was positively correlated with age (r=0.38, P<0.0001. Multivariate analyses using sociodemographic and clinical covariates demonstrated that plasma homocysteine levels retained their respective associations with self-reported sleep apnea in all models except when age was included as a covariate. Our results demonstrate that the claimed association of plasma homocysteine with sleep apnea may be confounded by age.

  2. Erythrocyte fatty acid profiles and plasma homocysteine, folate and vitamin B6 and B12 in recurrent depression

    DEFF Research Database (Denmark)

    Assies, Johanna; Mocking, Roel J T; Lok, Anja

    2015-01-01

    controls, we simultaneously measured key components of one-carbon metabolism in plasma (homocysteine, folate, vitamins B6 and B12), and of FA-metabolism in red blood cell membranes [main polyunsaturated fatty acids (PUFAs) eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA), and arachidonic acid (AA...... between B-vitamins and FA-parameters were non-significant, but also similar in patients and controls. Homocysteine and DHA were significantly less negatively associated in patients than in controls. In conclusion, these data indicate similarities but also differences in associations between parameters...

  3. A folate-rich diet is as effective as folic acid from supplements in decreasing plasma homocysteine concentrations.

    Science.gov (United States)

    Pintó, Xavier; Vilaseca, M Antonia; Balcells, Susana; Artuch, Rafael; Corbella, Emili; Meco, José F; Vila, Ramon; Pujol, Ramon; Grinberg, Daniel

    2005-01-01

    Background & Aims: At least 500 mug of folic acid are required daily to treat hyperhomocysteinemia. To reach this amount by dietary changes alone may be difficult because food has a low folic acid content and bioavailability. No studies have compared the effects of similar amounts of additional folate derived from a combination of folate-rich and fortified foods or folic acid from supplements on plasma total homocysteine (tHcy) concentrations, which was the aim of this study. Methods: Twenty male patients with hyperhomocysteinemia and coronary artery disease were included in a randomized, crossover intervention trial. Patients were treated daily with a combination of foods containing approximately 500 mug of folate or with one 500 mug capsule of synthetic folic acid over two five-week periods separated by a five-week wash-out period. Results: Plasma folate increased markedly (pfoods decreased tHcy by 8.6% (95% CI: -15.9 to -1.2) and synthetic folic acid capsules by 8% (95% CI: -13.3 to -2.7). Conclusions: This study shows, for the first time in the literature, that a folate-rich diet is as effective as folic acid capsules in decreasing plasma tHcy concentrations and adds further support to the recommendation of those diets to prevent cardiovascular disease.

  4. Long-term folic acid (but not pyridoxine) supplementation lowers elevated plasma homocysteine level in chronic renal failure.

    Science.gov (United States)

    Chauveau, P; Chadefaux, B; Coudé, M; Aupetit, J; Kamoun, P; Jungers, P

    1996-01-01

    Moderate hyperhomocysteinemia, a risk factor for premature atherosclerosis, is present in chronic uremic patients. We prospectively evaluated the effects of sequential supplementation with pyridoxine (70 mg/day) and folic acid (10 mg/day) for two 3-month periods in 37 nondialyzed patients (29 males) with creatinine clearance (CCr) ranging from 10 to 80 ml/min, whose plasma vitamin B12 and folate level was in the normal range. Mean (+/- SD) baseline plasma total homocysteine (Hcy) was 14.9 +/- 5.2, 16.5 +/- 5.1 and 26.1 +/- 12.1 mumol/l (upper limit in 45 healthy controls 14.1 mumol/l) in patients with CCr 40-80, 20-40 and pyridoxine Hcy did not significantly decrease whereas following folic acid Hcy decreased significantly to 9.9 +/- 2.9 (-33% vs. baseline), 10.3 +/- 3.4 (-37%) and 15.4 +/- 5.5 (-40%), respectively (Student's paired t test, p pyridoxine) pharmacologic supplementation is effective in lowering elevated plasma Hcy in chronic renal failure patients, thus suggesting that enhancing the Hcy remethylation pathway may overcome hyperhomocysteinemia in such patients. In view of the potential atherogenic effects of hyperhomocysteinemia, long-term folate supplementation should be considered in uremic patients.

  5. Preliminary report on plasma homocysteine and hormonal variations in infertile women in Lagos, Nigeria

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    Vincent Oluseye Osunkalu

    2015-01-01

    Full Text Available Background: The relationship between infertility and hormonal variations has been variously documented, but little has been reported on the interactions between hormonal factors, homocysteine (Hcy, and female infertility. Objective: This study aimed to evaluate the relationship between plasma Hcy levels and hormonal variations in infertile women. Materials and Methods: This descriptive cross-sectional study was carried out among eligible infertile and fertile women seeking care at the Lagos University Teaching Hospital, Lagos, Nigeria. The subjects were 100 women referred for management of infertility, and the controls were 50 fertile women who had given birth within the past year. Fasting plasma levels of Hcy were estimated using enzyme immunoassay. Serum levels of luteinizing hormone (LH, follicle-stimulating hormone (FSH, estradiol, prolactin, and progesterone were measured using  Access 2 (Immunoassay systems-beckman coulter, inc.250S.Kraemer blvd.Brea, ca 92821. U.S.A. Results: Mean plasma Hcy levels for subjects and controls were 9.50 ± 1.88 μmol/L and 9.44 ± 1.85 μmol/L, respectively, with no significant variation (P = 0.952. Plasma Hcy was not significantly associated with infertility and hormone levels. The mean serum levels of LH, FSH, and prolactin were significantly higher among subjects compared to controls. Conclusion: Hormonal variations observed in infertile women did not appear to significantly alter plasma Hcy levels, and hyperhomocysteinemia (HHcy may not have significantly contributed to female infertility in our environment.

  6. Plasma homocysteine level is a risk factor for osteoporotic fractures in elderly patients

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    Zhu Y

    2016-08-01

    Full Text Available Yuefeng Zhu,1 Jie Shen,2 Qun Cheng,3 Yongqian Fan,1 Weilong Lin1 1Department of Orthopedics, 2Department of Pharmacy, 3Department of Osteoporosis, Huadong Hospital, Fudan University, Shanghai, People’s Republic of China Objective: To study the relationship of plasma homocysteine (Hcy, bone turnover biomarkers (BTB, and bone mineral density (BMD with osteoporotic fracture (OPF in elderly people.Methods: Eighty-two patients (aged 65 years or older admitted to our orthopedics department between October 2014 and May 2015 were randomly divided into three groups: 1 OPF group: 39 cases with the mean age 81.82±5.49 years, which included 24 females and 15 males; 2 high-energy fracture (HEF group: 22 cases with the mean age 78.88±5.75 years, which included 16 females and six males; 3 non-bone-fracture group: 21 cases with mean age 79.75±5.47 years without bone fracture, which included 14 females and seven males. Plasma Hcy, BTB, and BMD were measured. Analysis of variance and multiple regression analysis were used in the statistical analysis.Results: There was no significant difference in either age or sex among the three groups. There were significant differences in plasma Hcy and hip BMD between the OPF and HEF groups; there was also significant difference in plasma Hcy, 25-(OH Vit D, and hip BMD between the OPF and non-fracture groups. There was no difference in lumbar spine BMD between the OPF group and the other two groups. There was no significant difference in plasma Hcy, 25-(OH Vit D, hip or lumbar spine BMD between the HEF and non-fracture group. There was no significant difference in procollagen type I N-propeptide of type I collagen, serum C-terminal cross-linking telopeptide of type I collagen, and parathyroid hormone among the three groups. Plasma Hcy was linearly correlated with age and serum C-terminal cross-linking telopeptide of type I collagen, but not correlated with either hip or lumbar spine BMD or any other BTBs

  7. Vegan diet-based lifestyle program rapidly lowers homocysteine levels.

    Science.gov (United States)

    DeRose, D J; Charles-Marcel, Z L; Jamison, J M; Muscat, J E; Braman, M A; McLane, G D; Keith Mullen, J

    2000-03-01

    Plasma homocysteine levels have been directly associated with cardiac disease risk. Current research raises concerns as to whether comprehensive lifestyle approaches including a plant-based diet may interact with other known modulators of homocysteine levels. We report our observations of homocysteine levels in 40 self-selected subjects who participated in a vegan diet-based lifestyle program. Each subject attended a residential lifestyle change program at the Lifestyle Center of America in Sulphur, Oklahoma and had fasting plasma total homocysteine measured on enrollment and then after 1 week of lifestyle intervention. The intervention included a vegan diet, moderate physical exercise, stress management and spirituality enhancement sessions, group support, and exclusion of tobacco, alcohol, and caffeine. B vitamin supplements known to reduce blood homocysteine levels were not provided. Subjects' mean homocysteine levels fell 13%: from 8.66 micromol/L (SD 2.7 micromol/L) to 7.53 micromol/L (SD 2.12 micromol/L; P < 0.0001). Subgroup analysis showed that homocysteine decreased across a range of demographic and diagnostic categories. Conclusions. Our results suggest that broad-based lifestyle interventions favorably impact homocysteine levels. Furthermore, analysis of Lifestyle Center of America program components suggests that other factors in addition to B vitamin intake may be involved in the observed homocysteine lowering.

  8. A quantile regression approach can reveal the effect of fruit and vegetable consumption on plasma homocysteine levels.

    Directory of Open Access Journals (Sweden)

    Eliseu Verly-Jr

    Full Text Available A reduction in homocysteine concentration due to the use of supplemental folic acid is well recognized, although evidence of the same effect for natural folate sources, such as fruits and vegetables (FV, is lacking. The traditional statistical analysis approaches do not provide further information. As an alternative, quantile regression allows for the exploration of the effects of covariates through percentiles of the conditional distribution of the dependent variable.To investigate how the associations of FV intake with plasma total homocysteine (tHcy differ through percentiles in the distribution using quantile regression.A cross-sectional population-based survey was conducted among 499 residents of Sao Paulo City, Brazil. The participants provided food intake and fasting blood samples. Fruit and vegetable intake was predicted by adjusting for day-to-day variation using a proper measurement error model. We performed a quantile regression to verify the association between tHcy and the predicted FV intake. The predicted values of tHcy for each percentile model were calculated considering an increase of 200 g in the FV intake for each percentile.The results showed that tHcy was inversely associated with FV intake when assessed by linear regression whereas, the association was different when using quantile regression. The relationship with FV consumption was inverse and significant for almost all percentiles of tHcy. The coefficients increased as the percentile of tHcy increased. A simulated increase of 200 g in the FV intake could decrease the tHcy levels in the overall percentiles, but the higher percentiles of tHcy benefited more.This study confirms that the effect of FV intake on lowering the tHcy levels is dependent on the level of tHcy using an innovative statistical approach. From a public health point of view, encouraging people to increase FV intake would benefit people with high levels of tHcy.

  9. Plasma homocysteine in late pregnancies complicated with preeclampsia and in newborns.

    Science.gov (United States)

    Baksu, Alparslan; Taskin, Mehtap; Goker, Nimet; Baksu, Basak; Uluocak, Aygul

    2006-01-01

    The aim of this study was to determine the relationship between maternal serum homocysteine levels in preeclampsia and the severity of the disease, neonatal serum homocysteine levels, maternal complications, and fetal outcome. Fifty pregnant women were included in this prospective study, of which 25 were severe (group I) and 25 were non-severe preeclamptic (group II). Maternal and neonatal serum homocysteine levels were measured by the fluorescence polarization immunoassay (FPIA) method. Maternal homocysteine levels in both groups were compared. The association of maternal and neonatal serum homocysteine levels with maternal complications and fetal outcome was investigated. When the maternal serum homocysteine cut-off value was accepted as 15 micromol/L, significant differences in relation to maternal (eclampsia; hemolysis, elevated liver enzymes, and low platelet count syndrome) and fetal (in utero mort fetalis, low birthweight) complications were observed between the group with maternal serum homocysteine level > 15 micromol/L and the group with maternal serum homocysteine level homocysteine would be valuable in the prevention of both maternal and fetal complications in preeclampsia should be designed.

  10. Elevated Total Homocysteine Levels in Acute Ischemic Stroke Are Associated With Long-Term Mortality.

    Science.gov (United States)

    Shi, Zhihong; Guan, Yalin; Huo, Ya Ruth; Liu, Shuling; Zhang, Meilin; Lu, Hui; Yue, Wei; Wang, Jinhuan; Ji, Yong

    2015-09-01

    Total homocysteine (tHcy) levels are associated with secondary vascular events and mortality after stroke. The aim of this study was to investigate whether tHcy levels in the acute phase of a stroke contribute to the recurrence of cerebro-cardiovascular events and mortality. A total of 3799 patients were recruited after hospital admission for acute ischemic stroke. Levels of tHcy were measured within 24 hours after primary admission. Patients were followed for a median of 48 months. During the follow-up period, 233 (6.1%) patients died. After adjustment for age, smoking status, diabetes mellitus, and other cardiovascular risk factors, patients in the highest tHcy quartile (>18.6 μmol/L) had a 1.61-fold increased risk of death (adjusted hazard ratio [HR], 1.61; 95% confidence interval [CI], 1.03-2.53) compared with patients in the lowest quartile (≤10 μmol/L). Further subgroup analysis showed that this correlation was only significant in the large-artery atherosclerosis stroke subtype (adjusted HR, 1.80; 95% CI, 1.05-3.07); this correlation was not significant in the small-vessel occlusion subtype (adjusted HR, 0.80; 95% CI, 0.30-2.12). The risk of stroke-related mortality was 2.27-fold higher for patients in the third tHcy quartile (adjusted HR, 2.27; 95% CI, 1.06-4.86) and 2.15-fold more likely for patients in the fourth quartile (adjusted HR, 2.15; 95% CI, 1.01-4.63) than for patients in the lowest tHcy quartile. The risk of cardiovascular-related mortality and the risk of recurrent ischemic stroke were not associated with tHcy levels. Our findings suggest that elevated tHcy levels in the acute phase of an ischemic stroke can predict mortality, especially in stroke patients with the large-vessel atherosclerosis subtype. © 2015 The Authors.

  11. Associations among objectively measured physical activity, fasting plasma homocysteine concentration, and MTHFR C677T genotype.

    Science.gov (United States)

    Murakami, Haruka; Iemitsu, Motoyuki; Sanada, Kiyoshi; Gando, Yuko; Ohmori, Yumi; Kawakami, Ryoko; Sasaki, Satoshi; Tabata, Izumi; Miyachi, Motohiko

    2011-12-01

    Elevated fasting plasma homocysteine (Hcy) level is a vascular disease risk factor. Plasma Hcy is affected by 5,10-methylenetetrahydofolate reductase (MTHFR) genotype and dietary folate intake. This cross-sectional study in 434 Japanese adults examined the associations among objectively measured physical activity (PA), plasma Hcy adjusting for dietary folate intake, and MTHFR C677T genotype. Daily PA was measured by triaxial accelerometry and all subjects completed a questionnaire about their dietary habits. Plasma Hcy and MTHFR C677T genotype were determined. Plasma Hcy in subjects with the TT genotype was significantly higher than in those with CC or CT genotype (p < 0.001). Plasma Hcy was significantly different between ≥ 200 (7.6 ± 0.2 nmol/mL) and <200 µg/day (8.3 ± 0.3 nmol/mL) folate intake groups (p = 0.003). There were no differences in plasma Hcy adjusting for age, sex, and folate intake between groups according to PA category in all subjects. However, there were significant interactions between time spent in light PA (p = 0.003), vigorous PA (p = 0.001), or inactivity (p = 0.004), and MTHFR genotype. In only the TT genotype, shorter time spent in light PA was associated with higher plasma Hcy than a longer time spent in light PA (11.5 ± 3.3 nmol/mL vs. 8.5 ± 3.3 nmol/mL, p < 0.001), and longer time spent in vigorous PA and inactivity were associated with higher plasma Hcy (11.8 ± 3.3 nmol/mL vs. 8.4 ± 3.2 nmol/mL, 11.6 ± 3.3 nmol/mL vs. 8.4 ± 3.3 nmol/mL, respectively, p < 0.001). In conclusion, light and vigorous PA were associated with plasma Hcy only in the TT genotype, but there were no such associations in all genotypes.

  12. Low diagnostic value of fasting and post-methionine load homocysteine tests. A study in Dutch subjects with homocysteine test indications

    NARCIS (Netherlands)

    Fokkema, M R; Dijck-Brouwer, D A J; van Doormaal, J J; Reijngoud, D J; Muskiet, F A J

    BACKGROUND: Homocysteine is a cardiovascular disease risk factor. We investigated, both in subjects with past plasma total homocysteine (tHcy) test indications and healthy adults, the diagnostic value of a fasting (tHcy) (f-tHcy) and the added value of a post-methionine-load tHcy (postload-tHcy).

  13. Folic acid and reduction of plasma homocysteine concentrations in older adults: a dose-response study

    NARCIS (Netherlands)

    Oort, van F.; Melse, A.; Brouwer, I.A.; Clarke, R.J.; West, C.E.; Katan, M.B.

    2003-01-01

    Background: Elevated homocysteine concentrations, a likely risk factor for cardiovascular disease, can be lowered effectively with folic acid. The minimum dose of folic acid required for maximal reduction of homocysteine concentrations is not yet known reliably. Objective: We aimed to determine the

  14. Folic acid and reduction of plasma homocysteine concentrations in older adults: a dose-response study

    NARCIS (Netherlands)

    Oort, van F.; Melse, A.; Brouwer, I.A.; Clarke, R.J.; West, C.E.; Katan, M.B.

    2003-01-01

    Background: Elevated homocysteine concentrations, a likely risk factor for cardiovascular disease, can be lowered effectively with folic acid. The minimum dose of folic acid required for maximal reduction of homocysteine concentrations is not yet known reliably. Objective: We aimed to determine the

  15. Plasma total homocysteine and its relationship with folic acid and vitamin B12 in elder pregnant women with gestational hypertension%高龄妊娠期高血压疾病患者血浆总同型半胱氨酸水平与叶酸和维生素B12的关系研究

    Institute of Scientific and Technical Information of China (English)

    陆玉良; 程震锋; 韦凡平; 邱升强

    2014-01-01

    目的:探讨高龄妊娠期高血压疾病患者血浆总同型半胱氨酸(tHcy)、血清叶酸和Vit B12水平3者的关系及其临床意义。方法选择67例高龄妊娠期高血压疾病患者(A组)、96例同期非高龄妊娠期高血压疾病患者(B组)、73例同期高龄妊娠妇女(C组)和152例同期非高龄妊娠妇女(D组),用荧光偏振免疫分析法测定血浆tHcy水平,离子捕捉免疫分析法测定血清叶酸水平,微粒子酶联免疫分析法测定血清Vit B12水平,进行分析和比较。结果 A组血浆tHcy水平、血清叶酸和Vit B12水平分别为(18.05±6.11)μmol/L、(8.34±3.54)nmol/L 和(304.23±75.38)pmol/L,B 组分别为(11.18±3.54)μmol/L、(12.36±4.53)nmol/L 和(364.23±89.35)pmol/L,C组分别为(8.21±3.76)μmol/L、(15.54±5.23)nmol/L和(404.53±92.35)pmol/L,D组分别为(7.81±3.23)μmol/L、(16.34±5.67)nmol/L和(421.73±113.55)pmol/L。A组tHcy水平高于其他3组(均P<0.01),叶酸和Vit B12水平则低于其他3组(均P<0.01),B组tHcy水平高于C组和D组(均P<0.01),叶酸和Vit B12水平则低于C组和D组(均P<0.01)。相关性分析显示,A、B两组血浆tHcy水平与血清叶酸、Vit B12水平均呈负相关性(r=-0.6372、-0.5747,均P<0.01),而在A组中表现更加明显,其血浆tHcy水平与血清叶酸、Vit B12水平呈高度负相关(r=-0.7653、-0.6843,均P<0.01)。结论妊娠期高血压疾病患者血浆tHcy浓度显著上升,血清叶酸、Vit B12浓度显著下降,随着怀孕年龄的增加这种负相关更加明显。%Objective To determine plasma total homocysteine (tHcy) and its relationship with folic acid and vitamin B12 in elder pregnant women with gestational hypertension. Methods Plasma tHcy, serum folic acid and vit B12 level were determined by fluorescence polarization immunoassay (FPIA), ion capture immunoassay (ICIA) and

  16. Plasma homocysteine and liver tissue S-adenosylmethionine, S-adenosylhomocysteine status in vitamin B6-deficient rats.

    Science.gov (United States)

    Taysi, S; Keles, M S; Gumustekin, K; Akyuz, M; Boyuk, A; Cikman, O; Bakan, N

    2015-01-01

    The aim of this study was to evaluate plasma homocysteine (Hcy), malondialdehyde (MDA), glutathione (GSH) levels, glutathione peroxidase (GSH-Px) and glutathione-S-transferase (GST) activities and liver tissue S-adenosylmethionine (SAM) and S-adenosylhomocysteine (SAH) levels in control and vitamin B6-deficient rats. Thirty-two male rats with a weight of 65-75 g were used for the experiment. The rats were divided into control (n=16) and vitamin B6-deficient groups. At the end of the experiment, the animals were anesthetized with ketamine-HCl (Ketalar, 20 mg/kg, i.p.), and the blood was collected by cardiac puncture after thoracotomy. Plasma Hcy, pyridoxal phosphate (PLP), liver SAM, SAH levels measured by an isocratic system with high performance liquid chromatography. Plasma GSH-Px, GSH activities and GSH, MDA levels were carried out using a spectrophotometer. Plasma Hcy, MDA, liver tissue SAH levels were significantly increased, whereas plasma GSH, PLP, liver tissue SAM levels, plasma GST, GSH-Px activities and SAM/SAH ratio were decreased compared to those of control group. Vitamin B6 deficiency causes an increase in plasma homocysteine levels. Thus, we think that vitamin B6 supplementation could be used for therapeutic purposes in hyperhomocysteinemia condition.

  17. Physiologically relevant plasma d,l-homocysteine concentrations mobilize Cd from human serum albumin.

    Science.gov (United States)

    Sagmeister, Peter; Gibson, Matthew A; McDade, Kyle H; Gailer, Jürgen

    2016-08-01

    Although low-level chronic exposure of humans to cadmium (Cd(2+)) can result in a variety of adverse health effects, little is known about the role that its interactions with plasma proteins and small molecular weight (SMW) ligands in the bloodstream may play in delivering this metal to its target organs. To gain insight, a Cd-human serum albumin (HSA) 1:1 (molar ratio) complex was analyzed by size exclusion chromatography (SEC) coupled on-line to a flame atomic absorption spectrometer (FAAS). Using a phosphate buffered saline (PBS)-buffer mobile phase, the stability of the Cd-HSA complex was investigated in the presence of 2.0mM of SMW ligands, including taurine, acetaminophen, l-methionine, l-cysteine (Cys), d,l-homocysteine (hCys) or l-cysteine methyl-ester (Cys-Me). While taurine, acetaminophen and l-methionine did not affect its integrity, Cys, hCys and Cys-Me completely abstracted Cd from HSA. Subsequent investigations into the effect of 1.5, 1.0 and 0.5mM Cys and hCys on the integrity of the Cd-HSA complex revealed clear differences with regard to the nature of the eluting SMW-Cd species between these structurally related endogenous thiols. Interestingly, the Cd-specific chromatograms that were obtained for 0.5mM hCys revealed the elution of an apparent mixture of the parent Cd-HSA complex with a significant contribution of a structurally uncharacterized CdxhCysy species. Since this hCys concentration is encountered in blood plasma of hyperhomocysteinemia patients and since previous studies by others have revealed that a SH-containing carrier mediates the uptake of Cd into hepatocytes, our results suggest that plasma hCys may play a role in the toxicologically relevant translocation of Cd from the bloodstream to mammalian target organs.

  18. Whey protein supplementation increases methionine intake but not homocysteine plasma concentration in rats.

    Science.gov (United States)

    Deminice, Rafael; Comparotto, Hugo; Jordao, Alceu Afonso

    2015-01-01

    The purpose of this study was to examine the effects of whey protein supplementation on homocysteine (Hcy) metabolism and liver oxidative stress in rats. Twenty-four rats were divided into 3 groups (n = 8) to receive one of the following diets for 4 weeks: control diet (C), whey protein-composed diet (WP), and whey protein-supplemented diet (WPS). The C and WP diets consisted of AIN-93 with 20% casein and 20% whey protein as protein source, respectively. WPS was AIN-93 (20% casein) supplemented by the addition of 20% (w/w) whey protein. Four weeks of ingesting a WPS diet resulted in a significantly higher (P protein and methionine intakes. Although a significant increase (P protein products, known liver oxidative stress markers, were increased in the WPS group compared with the C group. In addition, no change in glutathione liver concentration was observed in any of the groups studied. In conclusion, whey protein supplementation increases methionine intake substantially; however, it does not change plasma Hcy concentrations. On the other hand, increased hepatic oxidative stress markers were observed in whey protein supplemented rats were probably due to high protein intake.

  19. Distribution and Determinants of Plasma Homocysteine Levels in Rural Chinese Twins across the Lifespan

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    Yuelong Ji

    2014-12-01

    Full Text Available Plasma homocysteine (Hcy is a modifiable, independent risk factor for cardiovascular disease (CVD and is affected by both environmental and genetic factors. This study aimed to describe the gender- and age-specific distribution of Hcy concentration for 1117 subjects aged 10–66 years, a subset of a community-based rural Chinese twin cohort. In addition, we examined environmental and genetic contributions to variances in Hcy concentration by gender and age groups. We found that the distribution pattern for Hcy varied by both age and gender. Males had higher Hcy than females across all ages. Elevated Hcy was found in 43% of male adults and 13% of female adults. Moreover, nearly one fifth of children had elevated Hcy. Genetic factors could explain 52%, 36% and 69% of the variation in Hcy concentration among children, male adults and female adults, respectively. The MTHFR C677T variant was significantly associated with Hcy concentrations. Smokers with the TT genotype had the highest Hcy levels. Overall, our results indicate that elevated Hcy is prevalent in the children and adults in this rural Chinese population. The early identification of elevated Hcy will offer a window of opportunity for the primary prevention of CVD and metabolic syndrome.

  20. 血浆同型半胱氨酸水平与老年期痴呆的关系%Relationship between elderly dementia and plasma homocysteine level

    Institute of Scientific and Technical Information of China (English)

    刘建农; 黄自勇; 周渊东

    2002-01-01

    Objective To investigate relationship between elderly dementia and plasma homocysteine level.Method 69 patients with elderly dementia(ED) and 69 heathy seniles were selected and their plasma homocysteine (Hcy)level was determined by high-performance liquid chromatography and fluorescene detector.Result Plasma Hcy level in study was (26.5± 11.8)μ mol/L while in control group it was (12.4± 2.4) μ mol/L,(P< 0.001). Conclusion Higher plasma Hcy level could be a risk factor to the onset of ED.

  1. Homocysteine and cognitive function in the elderly

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    Pusparini Pusparini

    2016-02-01

    Full Text Available Dementia is prevalent among elderly people, and projections show that the number of affected might triple over the next 50 years, because of a large increase in the oldest segment of the population. The objective of this study was to investigate the relationship between cognitive function and serum homocysteine level. This study was a cross-sectional study carried out in Mampang district, South Jakarta. A total of 94 elderly people was recruited for this study consisting of 44 females and 50 males. In this study serum homocysteine level was assessed by fluorescent polarization immunoassay and cognitive function with the mini mental state examination (MMSE. In elderly women MMSE scores for plasma homocysteine concentrations of 14.9 mmol/L were 24.00 ± 3.68, 23.80 ± 6.51, and 20.80 ± 9.00 respectively, with p=0.000. In elderly men the MMSE scores for plasma homocysteine concentrations of 14.9 mmol/L were respectively 27.66 ± 2.06, 26.33 ± 3.79 and 24.03 ± 5.52 with p=0.008. Homocysteine concentrations of >14.9 mmol/L were more commonly found in males (66% than in females (22.70%. The results of a regression analysis indicated that the factors influencing cognitive function were level of education (p=0.001 and age (p=0.035, whereas gender and homocysteine concentration did not affect cognitive function (p=0.554 and p=0.714, respectively. Plasma homocysteine concentration was inversely related to cognitive function. The most important factors affecting cognitive function were level of education and age.

  2. Plasma Total Cysteine and Cardiovascular Risk Burden: Action and Interaction

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    Benedetta De Chiara

    2012-01-01

    Full Text Available We hypothesized that redox analysis could provide sensitive markers of the oxidative pathway associated to the presence of an increasing number of cardiovascular risk factors (RFs, independently of type. We classified 304 subjects without cardiovascular disease into 4 groups according to the total number of RFs (smoking, hypertension, hypercholesterolaemia, hyperhomocysteinaemia, diabetes, obesity, and their combination. Oxidative stress was evaluated by measuring plasma total and reduced homocysteine, cysteine (Cys, glutathione, cysteinylglycine, blood reduced glutathione, and malondialdehyde. Twenty-seven percent of subjects were in group 0 RF, 26% in 1 RF, 31% in 2 RF, and 16% in ≥3 RF. By multivariable ordinal regression analysis, plasma total Cys was associated to a higher number of RF (OR = 1.068; 95% CI = 1.027–1.110, =0.002. Total RF burden is associated with increased total Cys levels. These findings support a prooxidant effect of Cys in conjunction with RF burden, and shed light on the pathophysiologic role of redox state unbalance in preclinical atherosclerosis.

  3. Integrin α(IIb)β₃ exists in an activated state in subjects with elevated plasma homocysteine levels.

    LENUS (Irish Health Repository)

    McGarrigle, Sarah A

    2011-01-01

    Elevated levels of plasma homocysteine (Hcy) are an independent risk factor for cardiovascular disease and thrombosis. The molecular basis for this phenomenon is not known but may relate to modification of cell surface thiols. The platelet specific integrin α(IIb)β₃ is a cysteine-rich cell adhesion molecule that plays a critical role in platelet aggregation and adhesion in haemostasis and thrombosis. In this study, we looked for evidence of a homocysteine-induced modification of α(IIb)β₃ using a fluorescently labeled PAC-1 antibody that recognizes the activated conformation of the integrin on the platelet surface. We show that exogenous Hcy (10-100 µM) and homocysteine thiolactone (HcyTL) (10-100 µM) increased PAC-1 binding to platelets in a concentration dependent manner in vitro. In parallel, we show subjects with clinical hyperhomocysteinemia exhibit a greater degree of activation of α(IIb)β₃ compared to age-matched controls. These findings demonstrate that circulating Hcy can modulate the activation state of the platelet integrin α(IIb)β₃, a key player in platelet aggregation and thrombosis.

  4. Risk of Dementia Associated with Elevated Plasma Homocysteine in a Latin American Population

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    Inara J. Chacón

    2009-01-01

    Full Text Available The relationship between total homocysteine (tHcy and dementia risk remains controversial, as the association varies among populations and dementia subtypes. We studied a Venezuelan population that has high prevalence of both elevated tHcy and dementia. We tested the hypotheses that (1 elevated tHcy is associated with increased dementia risk, (2 the risk is greater for vascular dementia (VaD than for Alzheimer's disease (AD, and (3 a history of stroke may partly explain this association. 2100 participants (≥55 years old of the Maracaibo Aging Study underwent standardized neurological, neuropsychiatric, and cardiovascular assessments. Elevated tHcy was significantly associated with dementia, primarily VaD. When history of stroke and other confounding factors were taken into account, elevated tHcy remained a significant risk factor in older (>66 years, but not in younger (55–66 years subjects. Ongoing studies of this population may provide insight into the mechanism by which tHcy increases risk for dementia.

  5. Vitamin B-12 status is not associated with plasma homocysteine in parents and their preschool children: lacto-ovo, lacto, and ovo vegetarians and omnivores.

    Science.gov (United States)

    Yen, Chin-En; Yen, Chi-Hua; Cheng, Chien-Hsiang; Huang, Yi-Chia

    2010-02-01

    Vegetarians may be at risk of certain nutrient deficiencies, particularly vitamin B-12. Vitamin B-12 deficiency may increase plasma homocysteine concentration and thus may potentially increase the risk of cardiovascular disease in vegetarians. The purpose of this study was to assess and compare plasma homocysteine and vitamin B-12 status in vegetarian and omnivorous preschool children and their parents. In addition, the association between parents' and children's homocysteine and vitamin B-12 concentration was also examined. Fifty-six omnivores (28 preschool children and one of their parents), 34 lacto-ovo vegetarians (16 parents and 18 children), 5 ovo vegetarians (2 parents and 3 children), 1 lacto vegetarian parent, and 2 vegan parents were enrolled in this study. The mean age of preschool children was 5.1 +/- 1.3 years and that of their parent was 35.4 +/- 4.2 years. Nutrient intakes were recorded using 3-day dietary records. Fasting venous blood samples were obtained to measure serum creatinine, high-sensitivity C-reactive protein, hematological parameters, plasma homocysteine, serum folate, and vitamin B-12 concentrations. There was no significant difference in dietary folate intake between vegetarian and omnivores within parent and child groups. The mean plasma homocysteine level of vegetarian parents and their children was in the physiological range, and they had slightly but not significantly higher plasma homocysteine levels than omnivores. Omnivorous parents and their children had significantly higher vitamin B-12 intake than vegetarian participants but similar serum vitamin B-12 concentrations. Plasma homocysteine concentration was significantly and negatively associated with only serum folate levels (beta = -0.15) and dietary vitamin B-12 intake (beta = -0.05) in the omnivorous parents after adjusting for age, gender, body mass index, and serum creatinine. Vegetarian parents and their preschool children had a lower vitamin B-12 intake than omnivorous

  6. Effect of vitamin B deprivation during pregnancy and lactation on homocysteine metabolism and related metabolites in brain and plasma of mice offspring.

    Directory of Open Access Journals (Sweden)

    Vanessa Cavalcante da Silva

    Full Text Available Epidemiological and experimental studies indicate that the altered fetal and neonatal environment influences physiological functions and may increase the risk of developing chronic diseases in adulthood. Because homocysteine (Hcy metabolic imbalance is considered a risk factor for neurodegenerative diseases, we investigated whether maternal Vitamin B deficiency during early development alters the offspring's methionine-homocysteine metabolism in their brain. To this end, the dams were submitted to experimental diet one month before and during pregnancy or pregnancy/lactation. After birth, the offspring were organized into the following groups: control (CT, deficient diet during pregnancy and lactation (DPL and deficient diet during pregnancy (DP. The mice were euthanized at various stages of development. Hcy, cysteine, glutathione (GSH, S-adenosylmethionine (SAM, S-adenosylhomocysteine (SAH, folate and cobalamin concentrations were measured in the plasma and/or brain. At postnatal day (PND 0, total brain of female and male offspring exhibited decreased SAM/SAH ratios. Moreover, at PND 28, we observed decreased GSH/GSSG ratios in both females and males in the DPL group. Exposure to a Vitamin B-deficient diet during the ontogenic plasticity period had a negative impact on plasma folate and brain cortex SAM concentrations in aged DPL males. We also observed decreased plasma GSH concentrations in both DP and DPL males (PND 210. Additionally, this manipulation seemed to affect the female and male offspring differently. The decreased plasma GSH concentration may reflect redox changes in tissues and the decreased brain cortex SAM may be involved in changes of gene expression, which could contribute to neurodegenerative diseases over the long term.

  7. C677T methylenetetrahydrofolate reductase and plasma homocysteine levels among Thai vegans and omnivores.

    Science.gov (United States)

    Kajanachumpol, Saowanee; Atamasirikul, Kalayanee; Tantibhedhyangkul, Phieuvit

    2013-01-01

    Hyperhomocysteinemia among vegetarians and vegans is caused mostly by vitamin B12 deficiency. A C-to-T mutation in the methylenetetrahydrofolate reductase (MTHFR) gene results in a thermolabile MTHFR, which may affect homocysteine (Hcy) levels. The importance of this gene mutation among populations depends on the T allele frequency. Blood Hcy, vitamin B12, folate, vitamin B6, and MTHFR C677T mutation status were determined in 109 vegans and 86 omnivores aged 30 - 50 years. The vegans had significantly higher Hcy levels than the omnivores, geometric means (95 % CI) 19.2 (17.0 - 21.7) µmol/L vs. 8.53 (8.12 - 8.95) µmol/L, p vegans increased plasma Hcy, albeit insignificantly; geometric means 18.2 µmol/L, 20.4 µmol/L, and 30.0 µmol/L respectively in CC, CT, and TT MTHFR genotypes. There was also a significant decrease in serum folate; geometric means 12.1 ng/mL, 9.33 ng/mL, and 7.20 ng/mL respectively, in the CC, CT, and TT mutants, p = 0.006, and particularly, in the TT mutant compared with the CC wild type, 7.20 ng/mL vs. 12.1 ng/mL, p = 0.023. These findings were not seen in the omnivores. It was concluded that hyperhomocysteinemia is prevalent among Thai vegans due to vitamin B12 deficiency. C-to-T MTHFR mutation contributes only modestly to the hyperhomocysteinemia.

  8. Effect of excess methionine and methionine hydroxy analogue on growth performance and plasma homocysteine of growing Pekin ducks.

    Science.gov (United States)

    Xie, M; Hou, S S; Huang, W; Fan, H P

    2007-09-01

    One experiment was conducted to study the effect of excess dl-methionine (DLM) and dl-2-hydroxy-4-methylthiobutanoic acid free acid (dl-HMB-FA) on duck growth. One-day-old male white Pekin ducklings were fed common starter diets from hatch to 21 d of age and then fed the experimental diets from 21 to 42 d of age. Three hundred twenty 21-d-old birds were allotted to 40 raised wire-floor pens with 8 birds per pen according to similar pen weight. There were 5 dietary treatments that included a methionine-adequate control diet and control diets supplemented with 2 levels of dry DLM (1 or 2%) or 2 equimolar levels of liquid dl-HMB-FA (1.13 or 2.26%). Each dietary treatment was replicated 8 times. At 42 d of age, weight gain, feed intake, and gain/feed were measured and plasma was collected to analyze homocysteine. Compared with ducks fed control diets, excess DLM or dl-HMB-FA supplementation reduced weight gain and feed intake of birds significantly. However, on the equimolar basis, at 1 or 2% supplemental methionine activity, dl-HMB-FA was less growth-depressing than DLM. According to the growth response to excess methionine, the tolerable upper limit of dietary methionine for growing ducks may be less than 1.38% when the methionine level of the control diet (0.38%) was considered. On the other hand, plasma homocysteine was elevated markedly when 2% DLM or 2.26% dl-HMB-FA was added to control diets, but plasma homocysteine of ducks fed 2.26% dl-HMB-FA supplemented diets was lower significantly than birds fed equimolar DLM-supplemented diets, which indicated the toxicity of excess methionine sources and less toxicity of dl-HMB-FA relative to DLM.

  9. The effect of high-dose pyridoxine and folic acid supplementation on serum lipid and plasma homocysteine concentrations in dialysis patients.

    Science.gov (United States)

    Arnadottir, M; Brattström, L; Simonsen, O; Thysell, H; Hultberg, B; Andersson, A; Nilsson-Ehle, P

    1993-10-01

    Pyridoxine and folic acid supplementation in dialysis patients is a matter of debate. This study was performed to estimate the effects of pharmacologic doses of these vitamins on serum lipid and plasma homocysteine concentrations, which are known to be high in dialysis patients. Both hemodialysis and continuous ambulatory peritoneal dialysis patients were included in the study. Pyridoxine supplementation had a mild but significant cholesterol-lowering effect (7%). Folic acid supplementation significantly lowered plasma homocysteine concentrations by a mean of 30%. There was a strong, inverse correlation between blood folate and plasma homocysteine concentrations. These results indicate that daily supplementation with pyridoxine 300 mg and folic acid 5 mg has a beneficial effect on the cardiovascular risk profile in dialysis patients.

  10. Changes in lifestyle and total homocysteine in relation to MTHFR (C677T) genotype: the Inter99 study

    DEFF Research Database (Denmark)

    Husemoen, LL; Thomsen, TF; Fenger, M

    2006-01-01

    BACKGROUND: Reduction in total homocysteine (tHcy) may be clinically relevant in the prevention of cardiovascular disease (CVD) in the general population. OBJECTIVE: To examine the effects of changes in various lifestyle habits and lifestyle related biological CVD risk markers on changes in t......Hcy in relation to MTHFR(C677T) genotype. DESIGN: A 1 year follow-up study. SETTING: Copenhagen County, Denmark. SUBJECTS: Statistical analyses were based on a population-based sample of 915 men and women aged 30-60 years assessed to be at increased CVD risk at baseline and therefore offered lifestyle...... intervention and re-examination after one year. RESULTS: None of the studied lifestyle changes-- smoking, physical activity, dietary habits, and coffee, tea, and alcohol consumption-- was significantly associated with changes in tHcy, either overall, or in any of the MTHFR genotype subgroups. In addition...

  11. Predication of increased plasma homocysteine level on the prognosis of Chinese patients with first-onset ischemic stroke

    Institute of Scientific and Technical Information of China (English)

    Jiangtao YAN; Zhengliang YUE; Jiaomei SHAO; Rutai HUI; Daowen WANG

    2008-01-01

    Epidemiological studies show that increased plasma total homocysteine (tHcy) level was an independ-ent risk factor of cardiovascular diseases. This study was aimed to investigate the relationship between they level and prognosis of first-onset stroke in Chinese people. One hundred ninety six patients with first-onset ischemic stroke and ninety-five patients with first-onset hemorrha-gic stroke were enrolled in this study. The patients were divided into two groups in terms of tHey level (<18 umol/L and≥18 umol/L). The plasma tHcy level was detected by a high performance liquid chromatography method with fluorescence detection. All the patients underwent a 5-year follow-up. Survival analysis shows that the probability of death or new vascular events in the ischemic stroke patients with high tHcy level (≥18 umol/L) was significantly higher than that in the counter-parts with lower tHcy level (<18 umol/L) (50.9% and 28.7%, respectively, P=0.004). The relative risk of death or new vascular events was 2.363 (95% CI, 1.209 to 4.617, P=0.012) in ischemic stroke patients with high tHcylevels(≥18 umol/L) compared to those with a lower thcy level (< 18 umol/L). The increased tHey level was significantly associated with the risk of death or new vascular events (OR, 2.492, 95% CI, 1.148 to 5.407, P= 0.021) in patients with ischemic stroke in the exclusion of the influence of other risk factors such as gender, age, body mass index, plasma cholesterol level, the history of hypertension, diabetes or smoking. However, in the patients with hemorrhagic stroke, there was no significant difference in the probability of death or new vascular events between patients with a high tHcy level and those with a lower tHcy level (33.3% and 28.2%, respectively, P=0.546). Increased tHcy level was an independent risk factor for a worse outcome in patients with first-onset ischemic stroke, but not in hemorrhagic stroke patients.

  12. Oral anticoagulant treatment with coumarin derivatives does not influence plasma homocysteine concentration.

    NARCIS (Netherlands)

    Willems, H.P.J.; Heijer, M. den; Gerrits, W.B.J.; Schurgers, L.J.; Havekes, M.; Blom, H.J.; Bos, G.M.

    2006-01-01

    BACKGROUND: High circulating levels of homocysteine are a risk factor for arterial and venous thrombosis. This association has been established in numerous case-control studies. In some of these studies, patients were treated with anticoagulants at the time of venapuncture. It is not clear whether h

  13. Comparison of the effect of homocysteine in the reduced form, its thiolactone and protein homocysteinylation on hemostatic properties of plasma.

    Science.gov (United States)

    Malinowska, Joanna; Nowak, Paweł; Olas, Beata

    2011-03-01

    Mechanisms involved in the relationship between hyperhomocysteinemia and hemostatic process are still unclear. In the literature there are few papers describing studies on the effects of homocysteine (Hcys) on proteins that participate in blood coagulation and fibrinolysis in human. The aim of our study was to establish and compare the influence of a reduced form of Hcys (at final doses of 0.01 - 1 mM) and the most reactive form of Hcys - its cyclic thioester, homocysteine thiolactone (HTL, 0.1 - 1 μM) on the clot formation (using whole human plasma and purified fibrinogen) and the fibrin lysis. Moreover, the aim of our study was to explain the effect of plasma protein modifications (S- and N-homocysteinylation) on selected parameters of hemostasis. We observed that HTL, like its precursor, a reduced form of Hcys stimulated polymerization of fibrinogen, but this process was not dose-dependent. In the presence of HTL (at the lowest tested concentration - 0.1μM) the increase was about 55%. Our present results also demonstrated that Hcys in the reduced form (0.01 - 1 mM) and HTL at lower doses than Hcys (0.1 - 1 μM) reduced the fibrin lysis in whole human plasma. Our results reported that HTL, like the reduced form of Hcys (at concentrations corresponding to concentrations in plasma during hyperhomocysteinemia) induced modifications of hemostatic plasma proteins, and the consequence of these modifications may be alteration in protein structure associated with changes of hemostatic functions.

  14. Dietary serine and cystine attenuate the homocysteine-raising effect of dietary methionine: A randomized crossover trial in humans

    NARCIS (Netherlands)

    Verhoef, P.; Steenge, G.R.; Boelsma, E.; Vliet, T. van; Olthof, M.R.; Katan, M.B.

    2004-01-01

    Background: A high plasma total homocysteine (tHcy) concentration is a risk factor for cardiovascular disease. The increase in tHcy induced by methionine, the sole dietary precursor of homocysteine, might be modulated by other amino acids present in dietary proteins. Objectives: Our objectives were

  15. Effect of Short-Term Maximal Exercise on Biochemical Markers of Muscle Damage, Total Antioxidant Status, and Homocysteine Levels in Football Players

    Science.gov (United States)

    Hammouda, Omar; Chtourou, Hamdi; Chaouachi, Anis; Chahed, Henda; Ferchichi, Salyma; Kallel, Choumous; Chamari, Karim; Souissi, Nizar

    2012-01-01

    Purpose Prolonged physical exercise results in transient elevations of biochemical markers of muscular damage. This study examined the effect of short-term maximal exercise on these markers, homocysteine levels (Hcy), and total antioxidant status (TAS) in trained subjects. Methods Eighteen male football players participated in this study. Blood samples were collected 5-min before and 3-min after a 30-s Wingate test. Results The results indicated that plasma biochemical markers of muscle injury increased significantly after the Wingate test (Pbilirubin, and TAS increased significantly after exercise (P<0.05). However, Hcy levels were unaffected by the Wingate test (for 3-min post-exercise measurement). Conclusions Short-term maximal exercise (e.g. 30-s Wingate test) is of sufficient intensity and duration to increase markers of muscle damage, and TAS; but not Hcy levels. Increases in the selected enzymes probably come primarily from muscle damage, rather than liver damage. Moreover, increase of TAS confirms the Wingate test induced oxidative stress. PMID:23342222

  16. Plasma Homocysteine, Vitamin B12 and Folate Levels in Multiple System Atrophy: A Case-Control Study.

    Directory of Open Access Journals (Sweden)

    Shuyu Zhang

    Full Text Available Multiple system atrophy (MSA is a neurodegenerative disease, and its pathological hallmark is the accumulation of α-synuclein proteins. Homocysteine (Hcy is an intermediate amino acid generated during the metabolism of methionine. Hcy may contribute to the pathogenesis of neurodegenerative disorders. Vitamin B12 and folate are cofactors necessary for the methylation of homocysteine.This study compared the levels of serum Hcy, vitamin B12 and folate in patients with MSA with those in healthy people to reveal the possible association between MSA and plasma levels of Hcy, vitamin B12 and folate. We enrolled 161 patients with MSA and 161 healthy people in this study. The association between MSA and the levels of Hcy, vitamin B12 and folate were analyzed using binary logistic regression.The mean level of Hcy in patients with MSA was significantly higher than that in healthy controls (16.23 ± 8.09 umol/l vs 14.04 ± 4.25 umol/l, p < 0.05. After adjusting for age, sex and medical history, the odds ratio for Hcy was 1.07 (95% CI = 1.01-1.13, p < 0.05 for patients with MSA. Vitamin B12 and folate levels were not significantly different between patients with MSA and controls.Our data suggest that higher levels of Hcy may be associated with an increased risk for MSA.

  17. Gender and single nucleotide polymorphisms in MTHFR, BHMT, SPTLC1, CRBP2R, and SCARB1 are significant predictors of plasma homocysteine normalized by RBC folate in healthy adults.

    Science.gov (United States)

    Using linear regression models, we studied the main and two-way interaction effects of the predictor variables gender, age, BMI, and 64 folate/vitamin B-12/homocysteine/lipid/cholesterol-related single nucleotide polymorphisms (SNP) on log-transformed plasma homocysteine normalized by red blood cell...

  18. Boron deprivation decreases liver S-adenosylmethionine and spermidine and increases plasma homocysteine and cysteine in rats.

    Science.gov (United States)

    Nielsen, Forrest Harold

    2009-01-01

    Two experiments were conducted with weanling Sprague-Dawley rats to determine whether changes in S-adenosylmethionine utilization or metabolism contribute to the diverse responses to boron deprivation. In both experiments, four treatment groups of 15 male rats were fed ground corn-casein based diets that contained an average of 0.05 mg (experiment 1) or 0.15 mg (experiment 2) boron/kg. In experiment 2, some ground corn was replaced by sucrose and fructose to increase oxidative stress. The dietary variables were supplemental 0 (boron-deprived) or 3 (boron-adequate) mg boron/kg and different fat sources (can affect the response to boron) of 75 g corn oil/kg or 65 g fish (menhaden) oil/kg plus 10 linoleic acid/kg. When euthanized at age 20 (experiment 1) and 18 (experiment 2) weeks, rats fed the low-boron diet were considered boron-deprived because they had decreased boron concentrations in femur and kidney. Boron deprivation regardless of dietary oil increased plasma cysteine and homocysteine and decreased liver S-adenosylmethionine, S-adenosylhomocysteine, and spermidine. Plasma concentration of 8-iso-prostaglandin F2alpha (indicator of oxidative stress) was not affected by boron, but was decreased by feeding fish oil instead of corn oil. Fish oil instead of corn oil decreased S-adenosylmethionine, increased spermidine, and did not affect S-adenosylhomocysteine concentrations in liver. Additionally, fish oil versus corn oil did not affect plasma homocysteine in experiment 1, and slightly increased it in experiment 2. The findings suggest that boron is bioactive through affecting the formation or utilization of S-adenosylmethionine. Dietary fatty acid composition also affects S-adenosylmethionine formation or utilization, but apparently through a mechanism different from that of boron.

  19. Investigation of Homocystein Plasma Level in Cholestatic Rat and Its Effect on Nitric Oxide Secretion in Liver

    Directory of Open Access Journals (Sweden)

    N. Mirazi

    2005-04-01

    Full Text Available Homocystein (Hcy,one of the thio-amino acid is known as a risk factor in some cardiovascular diseases with releasing O2 radical . It has also been reported that; there is oxidative stress effects of Hcy in cholestasis. The aim of this study is to determine plasma Hcy alteration and nitric oxide (NO in liver and its effects on pathologic disfunction.In this study , 150 Spraque – Dawley male rats with 200 ± 20g body weight were used in the experiments and they were randomly divided in three control, SHAM and bile duct ligation (BDL groups (n= 10-12 . In 7th,14th,21st and 28th days cholestasis was observed in BDL group,the animal were anesthetized with ether and then blood samples were taken from heart directly and analysed for cystein , methionine by HPLC and HPLC-UV. Two hours before blood sampling , 40 and 100 mg/kg methionine were injected (I.P .All data are expressed as mean  SEM. Statistical evaluation of data performed by SPSS soft ware using analysis of variance (ANOVA followed by post hoc test. P-values less than 0.05 were considered statistically significant .The results suggest that billirubin and hepatic enzymes were significantly elevated in BDL rats compared with SHAM and controls (P<0.05. Homocystein concentration was significantly rised in 14th day in BDL group (P<0.05. The plasma cystein and methionine level were significantly elevated in BDL rats compared with SHAM and control groups ( p = 0.01 . Plasma nitrate / nitrite ratio were significantly increased in BDL rats compared with SHAM and control rats (P<0.05. With these data we suppose that some of the systemic oxidative stresses in BDL rat model of cholestasis contributes possibly through NO-dependent mechanisms disorders.

  20. Is the C677T polymorphism in methylenetetrahydrofolate reductase gene or plasma homocysteine a risk factor for diabetic peripheral neuropathy in Chinese individuals?

    Science.gov (United States)

    Wang, Hongli; Fan, Dongsheng; Hong, Tianpei

    2012-10-25

    The present study enrolled 251 diabetic patients, including 101 with neuropathy and 150 without neuropathy. Of the 150 patients, 100 had no complications, such as retinopathy, nephropathy, or neuropathy. Polymerase chain reaction-restriction fragment length polymorphism analysis was used to identify methylenetetrahydrofolate reductase gene variants. Plasma homocysteine levels were also measured. Homocysteine levels and the frequency of hyperhomocysteinemia were significantly higher in patients with diabetic peripheral neuropathy compared with diabetic patients without neuropathy (P diabetic peripheral neuropathy compared with patients without diabetic complications. Homocysteine levels were significantly higher in patients with diabetic peripheral neuropathy carrying the 677T allele and low folic acid levels. In conclusion, hyperhomocysteinemia is an independent risk factor for diabetic neuropathy in Chinese patients with diabetes. The C677T polymorphism in methylenetetrahydrofolate reductase and low folic acid levels may be risk factors for diabetic peripheral neuropathy in Chinese patients with diabetes.

  1. Homocysteine influences blood clot properties alone and in combination with total fibrinogen but not with fibrinogen γ' in Africans.

    Science.gov (United States)

    Nienaber-Rousseau, Cornelie; de Lange, Zelda; Pieters, Marlien

    2015-06-01

    Simultaneously increased fibrinogen and homocysteine (Hcy) in blood are believed to elevate the risk of cardiovascular disease mortality. However, the pathophysiological mechanisms involved are unknown. We sought to determine whether Hcy or its genetic determinants influence blood clot properties alone or in combination with fibrinogen. In addition, we investigated, for the first time, the gamma prime (γ') isoform of fibrinogen with Hcy in relation to clot architecture and lysis. Single-nucleotide polymorphisms, Hcy and hemostatic variables, including clot lysis, determined with a global fibrinolytic assay [giving lag time, slope, maximum absorbance and clot lysis time (CLT)], were measured in 1867 healthy black South Africans and cross-sectionally analyzed. Increasing Hcy did not affect fiber cross-sectional area (maximum absorbance). However, it decreased the time needed to initiate the coagulation cascade and for fibrin fibers to grow (lag time), it increased the tempo of lateral aggregation (slope) and reduced CLT. None of the single-nucleotide polymorphisms measured had effects on clot properties. Combined effects were observed between Hcy and total fibrinogen in predicting CLT. Fibrinogen γ', which affected markers of the fibrinolytic assay, did not have conjoint effects with Hcy. We believe that there is value in recognizing the combined effects of Hcy and fibrinogen, but not its γ' isoform in relation to clot structure and lysis. The enhanced fibrinolysis rate observed in patients with low fibrinogen and high Hcy may have adverse consequences for health if it disturbs hemostasis and results in a bleeding tendency.

  2. Comparative case-control study of homocysteine, vitamin B12, and folic acid levels in patients with epilepsy.

    Science.gov (United States)

    Pulido Fontes, L; Pulido Fontes, M; Quesada Jiménez, P; Muruzabal Pérez, J; Mendioroz Iriarte, M

    2017-09-01

    Increased blood homocysteine levels are a known cardiovascular risk factor. Epileptic patients on long-term treatment with antiepileptic drugs may present higher homocysteine levels and, consequently, a potential increase in cardiovascular risk. We conducted an observational case-control study to compare plasma levels of homocysteine, folic acid, and vitamin B12. Our study included a total of 88 subjects: 52 patients with epilepsy and 36 controls. Epileptic patients showed higher homocysteine levels (P=.084) and lower levels of folic acid (P<.05). Homocysteine levels should be monitored in epileptic patients on long-term treatment with antiepileptic drugs. We suggest starting specific treatment in patients with high homocysteine levels. Copyright © 2016 Sociedad Española de Neurología. Publicado por Elsevier España, S.L.U. All rights reserved.

  3. Plasma C-reactive protein and homocysteine concentrations are related to frequent fruit and vegetable intake in Hispanic and non-Hispanic white elders.

    Science.gov (United States)

    Gao, Xiang; Bermudez, Odilia I; Tucker, Katherine L

    2004-04-01

    Elevated C-reactive protein (CRP) and plasma total homocysteine (Hcy) were recently identified as risk factors for cardiovascular disease. However, few studies have related fruit and vegetable consumption to these markers of inflammation and B vitamin deficiency, particularly in the Hispanic population. We examined the relation of fruit and vegetable intake with plasma CRP and Hcy concentrations in a cross-sectional study. Subjects were 445 Hispanic elders and 154 neighborhood-based non-Hispanic white elders living in Massachusetts. Diet was assessed with a FFQ designed for this population. There were significant inverse dose-response associations between fruit and vegetable intake and plasma CRP (P for trend = 0.010) and Hcy (P for trend = 0.033) concentrations, after adjustment for potential confounders. The prevalence of high plasma CRP (> 10 mg/L), and high Hcy (>10.4 micromol/L for women and >11.4 micromol/L for men), was significantly greater among subjects in the lowest quartile of fruit and vegetable consumption relative to those in the highest quartile, 17.9 vs. 9.1% and 58.7 vs. 44.4%, respectively. With each additional serving of fruit and vegetable intake, adjusted odd ratios for high plasma CRP and Hcy were 0.79 (95% CI: 0.65 to 0.97) and 0.83 (95% CI: 0.72 to 0.96), respectively. Greater frequency of fruit and vegetable intake was associated with significantly lower plasma CRP and Hcy concentrations. Because both of these metabolites are known risk factors for CVD, these findings contribute to the evidence that a higher intake of fruit and vegetables may reduce the risk of CVD.

  4. Homocysteine Test

    Science.gov (United States)

    ... may recommend homocysteine testing in malnourished individuals, the elderly, who often absorb less vitamin B12 from their diet, and individuals with poor nutrition, such as drug or alcohol addicts. Homocysteine may be ordered as part of a screen for people at high risk for heart attack or stroke . ...

  5. Brain cell apoptosis and enhancement of nervous excitability in pregnant rats with high plasma levels of homocysteine.

    Science.gov (United States)

    Wang, Jun; Ge, Jing; Yang, Liu; Zhang, Haiyan; Li, Xuli; Xue, Dan

    2012-10-05

    Hyperhomocysteinemia is an important risk factor for preeclampsia-eclampsia. This study established a pregnant rat model of hyperhomocysteinemia, in which blood plasma homocysteine concentrations were twice or three times greater than that of normal pregnant rats. TUNEL revealed an increase in the number of apoptotic cells in the frontal cortex of pregnant rats with hyperhomocysteinemia. In addition, immunohistochemical staining detected activated nuclear factor-κB-positve cells in the frontal cortex. Reverse transcription-PCR detected that mRNA expression of the anti-apoptotic gene bcl-2 diminished in the frontal cortex. In situ hybridization and western blotting revealed that N-methyl-D-aspartate receptor 1 mRNA and protein expression was upregulated in the frontal cortex and hippocampus. These results indicate that hyperhomocysteinemia can induce brain cell apoptosis, increase nerve excitability, and promote the occurrence of preeclampsia in pregnant rats.

  6. Brain cell apoptosis and enhancement of nervous excitability in pregnant rats with high plasma levels of homocysteine

    Institute of Scientific and Technical Information of China (English)

    Jun Wang; Jing Ge; Liu Yang; Haiyan Zhang; Xuli Li; Dan Xue

    2012-01-01

    Hyperhomocysteinemia is an important risk factor for preeclampsia-eclampsia.This study established a pregnant rat model of hyperhomocysteinemia,in which blood plasma homocysteine concentrations were twice or three times greater than that of normal pregnant rats.TUNEL revealed an increase in the number of apoptotic cells in the frontal cortex of pregnant rats with hyperhomocysteinemia.In addition,immunohistochemical staining detected activated nuclear factor-κB-positve cells in the frontal cortex.Reverse transcription-PCR detected that mRNA expression of the anti-apoptotic gene bcl-2diminished in the frontal cortex.In situ hybridization and western blotting revealed that N-methyl-D-aspartate receptor 1 mRNA and protein expression was upregulated in the frontal cortex and hippocampus.These results indicate that hyperhomocysteinemia can induce brain cell apoptosis,increase nerve excitability,and promote the occurrence of preeclampsia in pregnant rats.

  7. The methionine-homocysteine cycle and its effects on cognitive diseases.

    Science.gov (United States)

    Miller, Alan L

    2003-02-01

    Homocysteine, a sulfur-containing amino acid, is a metabolite of the essential amino acid methionine, and exists at a critical biochemical intersection in the methionine cycle - between S-adenosylmethionine, the indispensable ubiquitous methyl donor, and vitamins B12 and folic acid. High blood levels of homocysteine signal a breakdown in this vital process, resulting in far-reaching biochemical and life consequences. The link between homocysteine and cardiovascular disease is well established, and decreasing plasma total homocysteine by providing nutritional cofactors for its metabolism has been shown to reduce the risk of cardiovascular events. Information has been emerging regarding a connection between homocysteine metabolism and cognitive function, from mild cognitive decline (age-related memory loss) to vascular dementia and Alzheimer's disease. Significant deficiencies in the homocysteine re-methylation cofactors cobalamin (B12) and folate, as well as the trans-sulfuration cofactor vitamin B6, are commonly seen in the elderly population, with a resultant increase in homocysteine with advancing age. Hyperhomocysteinemia has been shown to be an independent risk factor for cognitive dysfunction. Indirect and direct vascular damage can be caused by homocysteine, which has been implicated in vascular dementia, with an increased risk of multiple brain infarcts and dementia as homocysteine levels rise. A significant correlation has been found between risk of Alzheimer's disease and high plasma levels of homocysteine, as well as low levels of folic acid, and vitamins B6 and B12. All of these disease associations are thought to be interrelated via increased homocysteine and S-adenosylhomocysteine and subsequent hypomethylation of numerous substances, including DNA and proteins, that render vascular structures and neurons more susceptible to damage and apoptosis. Providing the nutritional cofactors for proper functioning of the methionine cycle may improve methylation

  8. Brain MRI, apoliprotein E genotype, and plasma homocysteine in American Indian Alzheimer disease patients and Indian controls.

    Science.gov (United States)

    Weiner, Myron F; de la Plata, Carlos Marquez; Fields, B A Julie; Womack, Kyle B; Rosenberg, Roger N; Gong, Yun-Hua; Qu, Bao-Xi; Diaz-Arrastia, Ramon; Hynan, Linda S

    2009-02-01

    We obtained brain MRIs, plasma homocysteine levels and apolipoprotein E genotyping for 11 American Indian Alzheimer disease (AD) subjects and 10 Indian controls. We calculated white matter hyperintensity volume (WMHV), whole brain volume (WBV), and ratio of white matter hyperintensity volume to whole brain volume (WMHV/WBV). There were no significant differences between AD subjects and controls in gender, history of hypertension, diabetes, or history of high cholesterol, but hypertension and diabetes were more common among AD subjects. There was no difference between AD and control groups in age (range for all subjects was 61-89 years), % Indian heritage, waist size or body mass index. Median Indian heritage was 50% or greater in both groups. Range of education was 5-13 years in the AD group and 12-16 years in controls. Median plasma homocysteine concentration was higher in AD subjects (11 micromol/L vs. 9.8 micromol/L), but did not achieve statistical significance. Significantly more AD subjects had apolipoprotein Eepsilon4 alleles than did controls (63% vs.10%). Neuroimaging findings were not significantly different between the 2 groups, but AD subjects had greater WMHV (median 15.64 vs. 5.52 cc) and greater WMHV/WBV ratio (median 1.63 vs. 0.65 %) and a far greater range of WMHV. In combined AD subjects and controls, WBV correlated with BMI and age. WMHV and WMHV/WBV correlated inversely with MMSE scores (p = 0.001, 0.002, respectively). In addition, WMHV correlated positively with % Indian heritage (p = 0.047).

  9. High Plasma Homocysteine Increases Risk of Metabolic Syndrome in 6 to 8 Year Old Children in Rural Nepal

    Directory of Open Access Journals (Sweden)

    Mohsin Yakub

    2014-04-01

    Full Text Available Little attention has been given to the association of plasma homocysteine (Hcy and metabolic syndrome (MetS in children. We have evaluated the risk of MetS with plasma Hcy in a cohort of 6 to 8 year old rural Nepalese children, born to mothers who had participated in an antenatal micronutrient supplementation trial. We assessed Hcy in plasma from a random selection of n = 1000 children and determined the relationship of elevated Hcy (>12.0 μmol/L to MetS (defined as the presence of any three of the following: abdominal adiposity (waist circumference ≥ 85th percentile of the study population, high plasma glucose (≥85th percentile, high systolic or diastolic blood pressure (≥90th percentile of reference population, triglyceride ≥ 1.7 mmol/L and high density lipoprotein < 0.9 mmol/L. and its components. There was an increased risk of low high-density lipoproteins (HDL, [odds ratios (OR = 1.77, 95% confidence intervals (CI = 1.08–2.88; p = 0.020], high blood pressure [OR = 1.60, 95% CI = 1.10–2.46; p = 0.015] and high body mass index (BMI [OR = 1.98, 95% CI = 1.33–2.96; p = 0.001] with elevated Hcy. We observed an increased risk of MetS (OR = 1.75, 95% CI = 1.06–2.90; p = 0.029 with elevated Hcy in age and gender-adjusted logistic regression models. High plasma Hcy is associated with increased risk of MetS and may have implications for chronic disease later in life.

  10. Plasma Homocysteine, Serum Folic Acid, Serum Vitamin B12, Serum Vitamin B6, MTHFR, and Risk of Normal-Tension Glaucoma.

    Science.gov (United States)

    Li, Jinmiao; Xu, Fan; Zeng, Rui; Gong, Haijun; Lan, Yuqing

    2016-02-01

    This meta-analysis aims to comprehensively evaluate the association between total homocysteine (tHcy) levels, serum folic acid, vitamin B12, vitamin B6 levels, methylenetetrahydrofolate reductase (MTHFR) C677T genotype, and risk of normal-tension glaucoma (NTG). A systematic search of the EMBASE and PubMed databases was performed to evaluate plasma tHcy levels, serum folic acid, B vitamins' mean difference, and odds ratios of MTHFR C677T genotype between cases and controls. A total of 7 studies including 458 cases and 555 controls meeting the inclusion criteria were involved in this meta-analysis. There were 4 studies for tHcy (149 cases and 148 controls), 2 studies for vitamin B6, vitamin B12, and folate (90 cases and 82 controls), and 4 studies for MTHFR (343 cases and 449 controls). Overall, the mean plasma tHcy levels, serum folic acids, vitamin B12, and vitamin B6 levels were 1.16 μmol/L [95% confidence interval (CI), -0.13, 2.45], -0.62 μmol/L (95% CI, -1.98, 0.74), 5.81 μmol/L (95% CI, -3.53, 15.14), and -16.79 μmol/L (95% CI, -86.09, 52.51). MTHFR TT genotype was found to be unrelated to NTG risk (odds ratio=1.08; 95% CI, 0.69, 1.69). NTG is not associated with elevated plasma tHcy, serum folic acid, serum vitamin B12, serum vitamin B6, and MTHFR C677T genotype.

  11. Effects of methyl-deficient diets on methionine and homocysteine metabolism in the pregnant rat.

    Science.gov (United States)

    Wilson, Fiona A; Holtrop, Grietje; Calder, A Graham; Anderson, Susan E; Lobley, Gerald E; Rees, William D

    2012-06-15

    Although the importance of methyl metabolism in fetal development is well recognized, there is limited information on the dynamics of methionine flow through maternal and fetal tissues and on how this is related to circulating total homocysteine concentrations. Rates of homocysteine remethylation in maternal and fetal tissues on days 11, 19, and 21 of gestation were measured in pregnant rats fed diets with limiting or surplus amounts of folic acid and choline at two levels of methionine and then infused with L-[1-(13)C,(2)H(3)-methyl]methionine. The rate of homocysteine remethylation was highest in maternal liver and declined as gestation progressed. Diets deficient in folic acid and choline reduced the production of methionine from homocysteine in maternal liver only in the animals fed a methionine-limited diet. Throughout gestation, the pancreas exported homocysteine for methylation within other tissues. Little or no methionine cycle activity was detected in the placenta at days 19 and 21 of gestation, but, during this period, fetal tissues, especially the liver, synthesized methionine from homocysteine. Greater enrichment of homocysteine in maternal plasma than placenta, even in animals fed the most-deficient diets, shows that the placenta did not contribute homocysteine to maternal plasma. Methionine synthesis from homocysteine in fetal tissues was maintained or increased when the dams were fed folate- and choline-deficient methionine-restricted diets. This study shows that methyl-deficient diets decrease the remethylation of homocysteine within maternal tissues but that these rates are protected to some extent within fetal tissues.

  12. Effect of losartan with folic acid on plasma homocysteine and vascular ultrastructural changes in spontaneously hypertensive rats.

    Science.gov (United States)

    Zhu, Lihe; Yu, Jiong; Jia, Baofu; Zhao, Feng; Tang, Mengmeng; Hu, Lufeng; Lin, Feiyan

    2015-01-01

    Elevated homocysteine (Hcy) is a high risk factor of hypertension due to its function in endothelial dysfunction. Its level in the blood is strongly influenced by folic acid. In order to investigate the effects of losartan with folic acid on plasma level of Hcy and vascular ultrastructural changes, thirty spontaneously hypertensive rats (SHR) involved and randomly divided into three groups (n=10): SHR-C group (control), SHR-L group (losartan 25 mg · kg(-1) · d(-1)), SHR-L+Y group (losartan 25 mg · kg(-1) · d(-1) + folic acid 0.4 mg · kg(-1) · d(-1)). Another 10 Wistar Rats involved as WKY-C group for normal control. The level of plasma Hcy was measured dynamically by LS-MS, the vascular ultrastructural changes were analyzed by light and electron microscopy. Moreover, the thickness and area of aorta was measured. The results showed the Hcy levels in four groups were WKY-C 7.49 ± 1.95 μmol/L; SHR-C 8.45 ± 1.90 μmol/L; SHR-L 8.28 ± 2.11 μmol/L; SHR-L+Y 7.53 ± 2.02 μmol/L at 80 days. There was no significant change for plasma Hcy (P>0.05). The morphological change showed the subendothelial space didn't increased significantly, the endothelial cells have a more smooth and intact cellular membrane in SHR-L+Y group. In conclusion, Losartan combined with folic acid could improve arterial endothelial structure in SHR which has no significant correlation with plasma Hcy.

  13. Efficacy of folic acid supplementation on endothelial function and plasma homocysteine concentration in coronary artery disease: A meta-analysis of randomized controlled trials.

    Science.gov (United States)

    Yi, Xin; Zhou, Yanli; Jiang, Dingsheng; Li, Xiaoyan; Guo, Yi; Jiang, Xuejun

    2014-05-01

    The aim of the present study was to conduct an updated meta-analysis of relevant randomized controlled trials (RCTs) in order to estimate the effect of folic acid supplementation on endothelial function and the concentration of plasma homocysteine in patients with coronary artery disease (CAD). An extensive search of PubMed was conducted to identify RCTs that compared folic acid with placebo therapy. The mean difference (MD) and 95% confidence interval (CI) were used as a measure of the correlation between folic acid supplementation and endothelial function/plasma homocysteine concentration. Of the 377 patients included in this analysis, 191 patients underwent folic acid supplementation and 186 individuals underwent placebo treatment. Compared with the use of a placebo, folic acid supplementation alone exhibited significant efficacy on increasing flow-mediated dilation (FMD; MD, 57.72 μm; 95% CI, 50.14-65.31; Pfolic acid and placebo groups (P>0.05). Therefore, the meta-analysis indicated that 5 mg folic acid daily supplementation for >4 weeks significantly improved FMD and lowered the concentration of plasma homocysteine in patients with CAD. However, more RCTs are required in order to confirm these observations.

  14. Relationship between Plasma Levels of Homocysteine and Pro-Inflammatory Cytokines in Patients with Rheumatoid Arthritis

    Directory of Open Access Journals (Sweden)

    Ayşe Balkarli

    2016-06-01

    Full Text Available Objective: The aim of the study was to investigate levels of homocysteine (Hcy, folate, vitamin B12, interleukin-6 (IL-6 and Tumor necrosis factor-alpha (TNF-α and to assess relationship between Hcy levels and inflammatory mediators including IL-6 and TNF-α in untreated patients with rheumatoid arthritis (RA. Methods: The study included 55 women including 30 newly diagnosed and untreated female RA patients and 25 age-matched healthy individuals as controls. Results: Erythrocyte sedimentation rate (ESH, C-reactive protein (CRP, IL-6 and TNF-α levels were significantly higher in RA patients than controls (p0.05. There were no significant correlations between Hcy levels and acute phase reactants or inflammatory mediators (p>0.05. Conclusion: Both mediators such as IL-6 and TNF-α and hyper-homocysteinemia are associated with atherosclerotic cardiovascular diseases. There was no significant correlation between Hcy levels and inflammatory mediators, although levels of these molecules were elevated in RA. Both inflammatory mediators and Hcy may cause an increase in athero­sclerotic cardiovascular disorders through diverse pathways. J Clin Exp Invest 2016; 7 (2: 163-167

  15. [Meta-analysis of clinical trials of folic acid, vitamin B12 and B6 supplementation on plasma homocysteine level and risk of cardiovascular disease].

    Science.gov (United States)

    Li, Jun; Li, Bin; Qi, Juanfei; Shen, Bo

    2015-06-01

    To evaluate the effects of folic acid, vitamin B(6) and B(12) supplementation on plasma homocysteine level and risk of cardiovascular disease. The databases, including Embase, Pubmed, Ovid, Biosis, China National Knowledge Infra-structure (CNKI), Wanfang Data, VIP Database for Chinese Technical Periodical (VIP), Chinese Biomedical Literature Database (CMB), were searched to identify random control trials between February 1994 to February 2014 on the effect of folic acid, vitamin B(6) and B(12) supplementation on plasma homocysteine level and risk of cardiovascular disease. The screening, data extraction and quality assessment were conducted in accordance with the inclusion and exclusion criteria by two reviewers independently. The software Review Manager 5.2 was used. Funnel plots and Egger's regression test were applied to evaluate the publication bias. Data from 12 studies including 34 481 patients were analyzed using a fixed-effects model. Funnel plot and Egger's test (P > 0.10) confirmed the absence of publication bias. No statistically significant heterogeneity was detected on testing after excluding the sources of heterogeneity (chi-square test, I folic acid, vitamin B(6) and B(12) groups (all P > 0.05). Mean homocysteine levels were significantly lower with folic acid, vitamin B(6) and B(12) therapy compared with placebo during follow-up (all P folic acid, vitamin B(6) and B(12) supplementation compared with placebo were 0.98 (0.93-1.03) for cardiovascular event, 0.97 (0.87-1.07) for coronary artery disease, 1.00 (0.92-1.08) for myocardial infarction and 0.92 (0.82-1.03) for cardiovascular death. Folic aicd combined with vitamin B(6) and B(12) treatment significantly reduced plasma homocysteine level, but did not affect the risk of cardiovascular disease. Thus, folic acid combined with vitamin B(6) and B(12) should not be recommended as secondary prevention of cardiovascular diseases.

  16. Circulating levels of homocysteine in preeclamptic women.

    Science.gov (United States)

    Khosrowbeygi, A; Ahmadvand, H

    2011-12-01

    It has been hypothesized that maternal hyperhomocysteinemia to be associated with preeclampsia. The aims of the present study were to examine maternal serum levels of total homocysteine in preeclamptic women and its association with the severity of the disease. The study population consisted of 30 preeclamptic patients and 30 matched healthy pregnant women. Serum levels of total homocysteine were assessed using enzyme immunoassay method. Maternal serum levels of total homocysteine were significantly higher in preeclamptic group than in normal pregnant women. Women with severe preeclampsia had higher serum levels of total homocysteine than mild preeclamptic patients. Levels of total homocysteine correlated positively with systolic blood pressure values in preeclamptic women. In summary, maternal serum levels of total homocysteine were increased in preeclamptic women and hyperhomocysteinemia was associated with severity of preeclampsia.

  17. Relationship between total homocysteine and folate levels in pregnant women and their newborn babies according to maternal serum levels of vitamin B-12

    OpenAIRE

    Guerra-Shinohara,Elvira Maria; Paiva,Adriana de Azevedo; RONDÓ, Patrícia Helen de Carvalho; Yamasaki, Kátia; Terzi, Carolina A.; D'Almeida, Vânia

    2002-01-01

    Objective To determine total homocysteine and folate levels in pregnant women according to vitamin B-12 (B-12) levels, and to analyse the impact of maternal B-12 levels on the nutritional status of their newborn babies.Design Cross sectional observational study.Setting Two public hospitals in Jundiai City, São Paulo, Brazil.Sample Sixty-nine pregnant women and their respective newborn babies at the time of delivery.Methods Maternal blood was collected up to 8 hours before delivery. Umbilical ...

  18. Homocysteine and atheromatosis

    Institute of Scientific and Technical Information of China (English)

    洪梅

    2006-01-01

    @@ Homocysteine (Hcy) was first linked with atherosclerosis over more than 30 years ago. McCully reported autopsy evidence of extensive arterial thrombosis and atherosclerosis in two children with elevated plasma Hcy concentrations and homocystinuria in 1969. On the basis of this clinical observation, he put forward the Hcy theory of arteriosclerosis. Subsequent investigations HHcy have confirmed the association between and premature atherosclerosis of the coronary, cerebrovascular, and peripheral vascular beds.

  19. Is the C677T polymorphism in methylenetetrahydrofolate reductase gene or plasma homocysteine a risk factor for diabetic peripheral neuropathy in Chinese individuals?

    Institute of Scientific and Technical Information of China (English)

    Hongli Wang; Dongsheng Fan; Tianpei Hong

    2012-01-01

    The present study enrolled 251 diabetic patients,including 101 with neuropathy and 150 without neuropathy.Of the 150 patients,100 had no complications,such as retinopathy,nephropathy,or neuropathy.Polymerase chain reaction-restriction fragment length polymorphism analysis was used to identify methylenetetrahydrofolate reductase gene variants.Plasma homocysteine levels were also measured.Homocysteine levels and the frequency of hyperhomocysteinemia were significantly higher in patients with diabetic peripheral neuropathy compared with diabetic patients without neuropathy (P < 0.05).In logistic regression analysis with neuropathy as the dependent variable,the frequency of C677T in methylenetetrahydrofolate reductase was significantly higher in patients with diabetic peripheral neuropathy compared with patients without diabetic complications.Homocysteine levels were significantly higher in patients with diabetic peripheral neuropathy carrying the 677T allele and low folic acid levels.In conclusion,hyperhomocysteinemia is an independent risk factor for diabetic neuropathy in Chinese patients with diabetes.The C677T polymorphism in methylenetetrahydrofolate reductase and low folic acid levels may be risk factors for diabetic peripheral neuropathy in Chinese patients with diabetes.

  20. Blood homocysteine, folic acid, vitamin B12 and vitamin B6 levels in psoriasis patients

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    Meltem Uslu

    2017-09-01

    Full Text Available Background and Design: Homocysteine, a sulfur-containing amino acid, is known to be related with autoimmunity-inflammation, cardiovascular disease and DNA methylation. In this case-control study, we aimed to determine plasma homocysteine, folic acid, vitamin B12 and vitamin B6 levels in patients with psoriasis. Materials and Methods: Smoking, alcohol and coffee consumption habits were recorded in adult patients with plaque-type psoriasis and age- and sex-matched controls. Height and weight measurements were performed and Psoriasis Area and Severity Index (PASI scores were calculated. Fasting venous blood samples were collected to determine homocysteine, folic acid, vitamin B12, vitamin B6, glucose, total cholesterol, triglyceride, high density lipoprotein (HDL, erythrocyte sedimentation rate (ESR, and C-reactive protein (CRP levels. Results: There was no significant difference between psoriasis patients (n=43 and controls (n=47 in body mass index and alcohol and coffee consumption. Smoking rate was significantly high in psoriasis patients. The median PASI score was 10.0 (8.3-12.8. Plasma homocysteine, folic acid, vitamin B12, vitamin B6, total cholesterol, triglyseride, ESR and CRP values were not significantly different between patients and the controls. HDL level was low in psoriasis patients (p=0.001. Plasma homocysteine level was higher in males than in females. There was no relationship of homocysteine levels with patient’s age, PASI scores, ESR, CRP values and lipids. Homocysteine levels were inversely related with folic acid and vitamin B12 (p=0.000, r=-0.436, p=0.047, r=-0.204, respectively. We did not find any relationship between homocysteine and vitamin B6 levels. Conclusion: There was no increase in plasma homocysteine levels in psoriasis patients we followed up. Homocysteine level increases in inflammatory disorders and this increase is accepted as a cardiovascular disease marker. Homocysteine homeostasis may be balanced in our

  1. Homocysteine, folate and pregnancy outcomes.

    Science.gov (United States)

    Kim, M W; Hong, S-C; Choi, J S; Han, J-Y; Oh, M-J; Kim, H J; Nava-Ocampo, A; Koren, G

    2012-08-01

    The purpose of this study is to evaluate the relationship between maternal and/or cord blood folate/homocysteine concentrations and adverse pregnancy outcomes. The study population included a random sample of singleton pregnant women in whom we measured total homocysteine and folic acid in maternal or cord blood at deliveries. A total of 227 pregnant women were enrolled. The concentration of folate in maternal blood tended to be significantly lower in pre-term birth than in full-term delivery group (median (95% CI), 14.4 (3.6-73) vs 25 (7.3-105.5) p homocysteine in maternal and cord blood was significantly higher in the pre-eclampsia than in the normotensive group (7.9 (1.7-28.2) vs 5.9 (1.8-14.6) μmol/ml, p homocysteine concentration with pre-eclampsia.

  2. Changes in lifestyle, biological risk factors and total homocysteine in relation to MTHFR C677T genotype: a 5-year follow-up study

    DEFF Research Database (Denmark)

    Linneberg, A; Thuesen, Betina Heinsbæk; Jørgensen, Torben

    2009-01-01

    BACKGROUND/OBJECTIVES: Total homocysteine (tHcy) has been associated with increased risk of several diseases in the general population. It is not clear whether these associations are causal. A less healthy lifestyle as well as a less favorable biological risk factor profile have been related...... to increased tHcy in cross-sectional studies. In addition, the methylenetetrahydrofolate reductase (MTHFR) C677T gene variant is an important determinant of elevated tHcy. The main objective of the study was to examine the effect of changes in biological risk factors and lifestyle on tHcy in relation to MTHFR......, physical activity, smoking status, coffee, tea, total alcohol or wine consumption. An inverse relationship was observed between changes in tHcy and changes in the intake of beer in TT individuals but not in CC/CT individuals (P (interaction)=0.01). In addition, changes in tHcy were positively associated...

  3. Consumption of wheat aleurone-rich foods increases fasting plasma betaine and modestly decreases fasting homocysteine and LDL-cholesterol in adults.

    Science.gov (United States)

    Price, Ruth K; Keaveney, Edel M; Hamill, Lesley L; Wallace, Julie M W; Ward, Mary; Ueland, Per M; McNulty, Helene; Strain, J J; Parker, Michael J; Welch, Robert W

    2010-12-01

    There is strong evidence that whole-grain foods protect against heart disease. Although underlying mechanisms and components are unclear, betaine, found at high levels in wheat aleurone, may play a role. We evaluated the effects of a diet high in wheat aleurone on plasma betaine and related measures. In a parallel, single-blinded intervention study, 79 healthy participants (aged 45-65 y, BMI ≥ 25 kg/m(2)) incorporated either aleurone-rich cereal products (27 g/d aleurone) or control products balanced for fiber and macronutrients into their habitual diets for 4 wk. Fasting blood samples were taken at baseline and postintervention (4 wk) from participants. Compared with the control, the aleurone products provided an additional 279 mg/d betaine and resulted in higher plasma betaine (P aleurone-rich products into the habitual diet for 4 wk significantly increases plasma betaine concentrations and lowers tHcy, which is attributable to enhanced betaine-homocysteine methyltransferase-mediated remethylation of homocysteine. Although this supports a role for betaine in the protective effects of whole grains, concomitant decreases in LDL suggest more than one component or mechanism may be responsible.

  4. Role of maternal serum homocysteine level on fetal birth weight

    Directory of Open Access Journals (Sweden)

    Afrina Begum

    2016-08-01

    Full Text Available Objective: The present study has been conducted to investigate the role of plasma homocysteine on neonatal birth weight.Methods: This prospective cross sectional analytical study was conducted in the inpatient department of obstetrics & gynecology, Dhaka Medical College Hospital on 120 term, singleton pregnant women. Pregnant women with plasma total bomocysteine >15 µmol/L were termed as having hyperhomocysteinemia (case, n = 25, while women with plasma total homocysteine ≤15 µmol/L were considered as notmal (control, n = 95. Neonatal birth weight was the main outcome variable which was compared between case and control groups. Result: The entire women in the case group were in their 3rd decades, while 80% of the control group were in this age range and 10% was below 20 and 10% above 30 years old. The cases were older than the controls (25.6 ± 2.0 vs. 23.7 ± 4.7 years, p = 0.051 . Over three-quarters (76% of the cases were SSC level educated, while majority (84.2% of the controls was primary level educated. Eighty percent of the neonates born of mothers with hyperhomocysteinemia were of low birth weight as opposed to only 9.5% in the control group. The mothers of case-group carry nearly 40(95% of CI= 11.5 - 126.4 times higher risk of having low birth weight babies than the mothers with nonnal homocysteine level. The mean birth weight of neonates of case group was observed to be significantly higher (2.8 ± 0.4 kg than that of control group (2.2 ± 0.4 kg. Correlation between the two variables shows that as plasma homocysteine level of women increases the birth weight of neonates decreases bearing an inverse relationship between these two variables (r = - 0.326, p < 0.001 . Conclusion: Pregnant women with elevated plasma total homocysteine carry much higher risk of giving low birth weight babies than the women with normal or low level of total homocysteine. Thus, measuring total homcysteine during pregnancy is of much clinical importance as

  5. Vitamin B2, vitamin B12 and total homocysteine status in children and their associations with dietary intake of B-vitamins from different food groups: the Healthy Growth Study.

    Science.gov (United States)

    Manios, Yannis; Moschonis, George; Dekkers, Renske; Mavrogianni, Christina; Grammatikaki, Eva; van den Heuvel, Ellen

    2017-02-01

    To examine the associations between the dietary intakes of certain B-vitamins from different food sources with the relevant plasma status indices in children. A representative subsample of 600 children aged 9-13 years from the Healthy Growth Study was selected. Dietary intakes of vitamins B2, B12, B6 and folate derived from different food sources were estimated. Plasma levels of vitamin B2 (or riboflavin), methylmalonic acid (MMA) and total homocysteine (tHcy) were also measured. Plasma concentrations of vitamin B2 below 3 μg/L were found in 22.8 % of the children. Children in the lower quartile of dietary vitamin B2 intake were found to have the lowest plasma vitamin B2 levels compared to children in the upper three quartiles (5.06 ± 7.63 vs. 6.48 ± 7.88, 6.34 ± 7.63 and 6.05 ± 4.94 μg/L respectively; P = 0.003). Regarding vitamin B12 children in the lower quartile of dietary intake had higher mean plasma tHcy levels compared to children in the upper two quartiles, respectively (6.00 ± 1.79 vs. 5.41 ± 1.43 and 5.46 ± 1.64 μmol/L; P = 0.012). Positive linear associations were observed between plasma vitamin B2 levels and dietary vitamin B2 derived from milk and fruits (β = 0.133; P = 0.001 and β = 0.086; P = 0.037). Additionally, nonlinear associations were also observed between plasma vitamin B2 levels and vitamin B2 derived from red meat, as well as between tHcy levels and vitamins B12 and B6 derived from milk; vitamins B12, B6 and folate derived from cereal products and folate derived from fruits. A considerably high prevalence of poor plasma vitamin B2 status was observed in children. The intake of milk, fruits and cereals was associated with more favorable tHcy levels, while the intake of milk and fruits with more favorable plasma B2 levels. However, these findings need to be further confirmed from controlled dietary intervention studies examining the modulation of biomarkers of B-vitamins.

  6. Serum nitric oxide and homocysteine as biomarkers of ectopic pregnancy

    OpenAIRE

    Kavitha Meiyappan; Pooja Dhiman; Soundravally Rajendiren; Krishnalatha Thayagarajan; Soundara Raghavan S

    2015-01-01

    Background: Aim of current study was to evaluate the role of serum homocysteine and nitric oxide in the diagnosis of ectopic pregnancy. Methods: The study included 32 patients with ruptured ectopic, 29 miscarriage patients and 30 normal pregnant women as controls. Fasting plasma homocysteine, serum folate, vitamin B12 levels and nitric oxide levels were estimated at the time of admission. Results: Plasma homocysteine levels were significantly lower in patients with ectopic pregnancy t...

  7. Erythrocyte fatty acid profiles and plasma homocysteine, folate and vitamin B6 and B12 in recurrent depression: Implications for co-morbidity with cardiovascular disease.

    Science.gov (United States)

    Assies, Johanna; Mocking, Roel J T; Lok, Anja; Koeter, Maarten W J; Bockting, Claudi L H; Visser, Ieke; Pouwer, François; Ruhé, Henricus G; Schene, Aart H

    2015-10-30

    Oxidative stress induced interactions between fatty acid (FA) and one-carbon metabolism may be involved in co-occurrence of major depressive disorder (MDD) and cardiovascular disease (CVD), which have been scarcely studied together. In 137 recurrent MDD-patients vs. 73 age- and sex-matched healthy controls, we simultaneously measured key components of one-carbon metabolism in plasma (homocysteine, folate, vitamins B6 and B12), and of FA-metabolism in red blood cell membranes [main polyunsaturated fatty acids (PUFAs) eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA), and arachidonic acid (AA) and structural FA-indices (chain length, unsaturation, peroxidation)]. Results show significant positive associations of folate with EPA, DHA, and the peroxidation index, which were similar in patients and controls. After correction for confounders, these associations were lost except for EPA. Associations between B-vitamins and FA-parameters were non-significant, but also similar in patients and controls. Homocysteine and DHA were significantly less negatively associated in patients than in controls. In conclusion, these data indicate similarities but also differences in associations between parameters of one-carbon and FA-metabolism in recurrent MDD patients vs. controls, which may reflect differences in handling of oxidative stress. Further research should test the consequences of these differences, particularly the premature development of CVD in MDD.

  8. Population PK/PD model of homocysteine concentrations after high-dose methotrexate treatment in patients with acute lymphoblastic leukemia.

    Directory of Open Access Journals (Sweden)

    Hauke Rühs

    Full Text Available Elevated homocysteine concentrations have been associated with methotrexate-induced neurotoxicity. Based on methotrexate and homocysteine plasma concentrations of 494 children with acute lymphoblastic leukemia treated with high-dose methotrexate in the TOTAL XV study, a pharmacokinetic/pharmacodynamic (PK/PD model was built with NONMEM. Several compartment and indirect response models were investigated. The pharmacokinetic disposition of methotrexate was best described by a two-compartment model. Homocysteine concentrations were included by an indirect response model where methotrexate inhibition of the homocysteine elimination rate was described by an E(max model. The homocysteine baseline level was found to be age-dependent. Simulations revealed that folinate rescue therapy does not affect peak concentrations of homocysteine but leads to a modestly reduced homocysteine exposure. In conclusion, our PK/PD model describes the increase of methotrexate-induced HCY concentrations with satisfactory precision and can be applied to assess the effect of folinate regimens on the HCY concentration-time course.

  9. The screening power of methylenetetrahydrofolate reductase C677T polymorphism versus plasma homocysteine concentration in patients with stenosis of the internal carotid artery

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    Sandmann Wilhelm

    2006-09-01

    Full Text Available Abstract Background Hyperhomocysteinemia is an important and independent risk factor for vascular disease. About 35% of patients with stroke and 47% of patients with peripheral arterial disease have elevated plasma homocysteine (HCY concentrations. The relationship between plasma HCY and the methylentetrahydrofolate reductase (MTHFR C677T polymorphism is still unclear, especially in regard to screening/diagnostic power. Methods This case-control study was performed on 96 patients, who underwent surgery due to asymptomatic or symptomatic high grade stenosis of the internal carotid artery (ICA, and 96 healthy age and sex-matched, controls. Plasma HCY concentration was determined using a commercial kit for fully automated analysis (AxSYM, Abbott. The C677T polymorphism of the MTHFR-gene was assessed by PCR. Results The mean plasma HCY concentration was significantly higher in the group with stenosis of ICA compared to the controls, 12.43 ± 6.96 μM and 10.16 ± 3.16 μM, respectively, (p Conclusion Our study shows that in a population with a given pretest disease probability of 50%, the determination of plasma HCY concentration, with a positive predictive value of 0.82, is more suitable for screening of patients at risk than analysis of the MTHFR C677T polymorphism.

  10. Association between plasma level of homocysteine and vascular dementia%血浆同型半胱氨酸水平与血管性痴呆的关系

    Institute of Scientific and Technical Information of China (English)

    钟巧莹; 卢礼贤; 杨志华

    2007-01-01

    目的 探讨血浆同型半胱氨酸(Hcy)与血管性痴呆(VD)脑梗死患者的关系.方法 采用高效液相色谱分析法测定68例VD脑梗死及34例非痴呆脑梗死患者的血浆总Hcy水平.结果 VD组患者的平均血浆总Hcy水平为(21.34±10.56)μmol/L,非痴呆组血浆Hcy水平为(9.78±8.56)μmol/L,VD组显著高于非痴呆组,两组差异有统计学意义(P<0.01).66.2%VD脑梗死患者的血浆总Hcy水平升高,非痴呆组仅为27.3%,差异有统计学意义(P<0.01).结论 高Hcy血症可能是血管性痴呆(VD)危险因素之一.%Objective To study the relation between plasma total homocysteine(Hcy)and vascular dementia(VD).Methods Plasma total Hcy levels of 68 vascular dementia infarction patients and 34 nondementia infarction patients were measured using high performance liquid chromatography with fluorescence detection.Results The mean plasma total homocysteine level of VD patients was(21.34±10.56)μmol/Land of non-VD patients(9.78±8.56)μmol/L.The Hcy level in vascular dementia infarction patients was significantly higher than that in non-dementia infarction patients(P<0.01).Elevated Hcy level was found in 66.2% of vascular dementia infarction patients,only in 27.3%of non-dementia infarction patients,which was significantly different between two groups.Conclusion Hyperhomocysteinemia may be risk factor for vascular dementia infarction patients.

  11. DACH-LIGA homocystein (german, austrian and swiss homocysteine society): consensus paper on the rational clinical use of homocysteine, folic acid and B-vitamins in cardiovascular and thrombotic diseases: guidelines and recommendations.

    Science.gov (United States)

    Stanger, Olaf; Herrmann, Wolfgang; Pietrzik, Klaus; Fowler, Brian; Geisel, Jürgen; Dierkes, Jutta; Weger, Martin

    2003-11-01

    About half of all deaths are due to cardiovascular disease and its complications. The economic burden on society and the healthcare system from cardiovascular disability, complications, and treatments is huge and getting larger in the rapidly aging populations of developed countries. As conventional risk factors fail to account for part of the cases, homocysteine, a "new" risk factor, is being viewed with mounting interest. Homocysteine is a sulfur-containing intermediate product in the normal metabolism of methionine, an essential amino acid. Folic acid, vitamin B12, and vitamin B6 deficiencies and reduced enzyme activities inhibit the breakdown of homocysteine, thus increasing the intracellular homocysteine concentration. Numerous retrospective and prospective studies have consistently found an independent relationship between mild hyperhomocysteinemia and cardiovascular disease or all-cause mortality. Starting at a plasma homocysteine concentration of approximately 10 micromol/l, the risk increase follows a linear dose-response relationship with no specific threshold level. Hyperhomocysteinemia as an independent risk factor for cardiovascular disease is thought to be responsible for about 10% of total risk. Elevated plasma homocysteine levels (>12 micromol/l; moderate hyperhomocysteinemia) are considered cytotoxic and are found in 5 to 10% of the general population and in up to 40% of patients with vascular disease. Additional risk factors (smoking, arterial hypertension, diabetes, and hyperlipidemia) may additively or, by interacting with homocysteine, synergistically (and hence over-proportionally) increase overall risk. Hyperhomocysteinemia is associated with alterations in vascular morphology, loss of endothelial anti-thrombotic function, and induction of a procoagulant environment. Most known forms of damage or injury are due to homocysteine-mediated oxidative stress. Especially when acting as direct or indirect antagonists of cofactors and enzyme

  12. [Homocysteine and venous thromboembolism].

    Science.gov (United States)

    Monnerat, C; Hayoz, D

    1997-09-06

    Congenital homocysteinuria is a rare inherited metabolic disorder with early onset atherosclerosis and arterial and venous trombosis. Moderate hyperhomocysteinemia is more frequently encountered and is recognized as an independent cardiovascular risk factor. Several case-control studies demonstrate an association between venous thromboembolism and moderate hyperhomocysteinemia. A patient with moderate hyperhomocysteinemia has a 2-3 relative risk of developing an episode of venous thromboembolism. The occurrence of mild hyperhomocysteinemia in heterozygotes for the mutation of Leiden factor V involves a 10-fold increase in the risk of venous thromboembolism. The biochemical mechanism by which homocysteine may promote thrombosis is not fully recognized. Homocysteine inhibits the expression of thrombomodulin, the thrombin cofactor responsible for protein C activation, and inhibits antithrombin-III binding. Treatment with folic acid reduces the plasma level of homocysteinemia, but no study has demonstrated its efficacy in reducing the incidence of venous thromboembolism or atherosclerosis. Hyperhomocysteinemia should be included in the screening of abnormalities of hemostasis and thrombosis in patients with idiopathic thromboembolism, and mild hyperhomocysteinemia may justify a trial of folic acid.

  13. Homocysteine homeostasis and betaine-homocysteine S-methyltransferase expression in the brain of hibernating bats.

    Directory of Open Access Journals (Sweden)

    Yijian Zhang

    Full Text Available Elevated homocysteine is an important risk factor that increases cerebrovascular and neurodegenerative disease morbidity. In mammals, B vitamin supplementation can reduce homocysteine levels. Whether, and how, hibernating mammals, that essentially stop ingesting B vitamins, maintain homocysteine metabolism and avoid cerebrovascular impacts and neurodegeneration remain unclear. Here, we compare homocysteine levels in the brains of torpid bats, active bats and rats to identify the molecules involved in homocysteine homeostasis. We found that homocysteine does not elevate in torpid brains, despite declining vitamin B levels. At low levels of vitamin B6 and B12, we found no change in total expression level of the two main enzymes involved in homocysteine metabolism (methionine synthase and cystathionine β-synthase, but a 1.85-fold increase in the expression of the coenzyme-independent betaine-homocysteine S-methyltransferase (BHMT. BHMT expression was observed in the amygdala of basal ganglia and the cerebral cortex where BHMT levels were clearly elevated during torpor. This is the first report of BHMT protein expression in the brain and suggests that BHMT modulates homocysteine in the brains of hibernating bats. BHMT may have a neuroprotective role in the brains of hibernating mammals and further research on this system could expand our biomedical understanding of certain cerebrovascular and neurodegenerative disease processes.

  14. Elevated homocysteine level in siblings of patients with schizophrenia.

    Science.gov (United States)

    Geller, Vadim; Friger, Michael; Sela, Ben-Ami; Levine, Joseph

    2013-12-30

    Increased homocysteine plasma levels were reported in patients with schizophrenia and Levine et al. (2002) suggested that such increase characterizes mainly males. In the following study we examined whether such increased levels also characterize male siblings of schizophrenia patients. Forty-four pairs of schizophrenia patients and their corresponding healthy male siblings were recruited and sampled for homocysteine. We also had age-matched controls for each of the sibling. The median homocysteine plasma level for patients was 13.0 µMol/L and 11.7 µMol/L for their male siblings compared with a median of 10.9 µMol/L for the siblings' controls. There was no significant difference between homocysteine plasma level in patients and their siblings. Significant difference was found for homocysteine plasma level between the siblings' group and their matched controls. A partial correlation of Ln plasma homocysteine level between patients and their siblings was found to be close to a zero correlation of -0.089, p=0.57 for the whole study group and -0.15, p=0.38 in the male-male patient-sibling pairs. Our results show that elevated homocysteine plasma level may characterize schizophrenia patients' male siblings, a finding that seems to agree with previous studies suggesting elevated homocysteine level as a risk factor for developing schizophrenia.

  15. Association between the MTHFR C677T polymorphism, blood folate and vitamin B12 deficiency, and elevated serum total homocysteine in healthy individuals in Yunnan Province, China.

    Science.gov (United States)

    Ni, Juan; Zhang, Ling; Zhou, Tao; Xu, Wei-Jiang; Xue, Jing-Lun; Cao, Neng; Wang, Xu

    2017-03-01

    An increased serum total homocysteine (tHcy) concentration is typically associated with genetic defects involved in Hcy metabolism or related nutritional deficiencies. In this study, the combined effects of methylenetetrahydrofolate reductase (MTHFR) C677T polymorphism and folate and vitamin B12 deficiency on serum total Hcy (tHcy) levels were evaluated in a healthy Chinese population in Yunnan Province, China. The MTHFR C677T polymorphism was genotyped in 330 volunteers (164 men and 166 women) using polymerase chain reaction-restriction fragment length polymorphism analysis. Folate, vitamin B12, and tHcy concentrations were determined by corpuscle immune chemiluminescence assays. The tHcy concentration was determined using an enzymatic assay. Significant negative correlations (pvitamin B12 (r=-0.243). Men had significantly higher serum tHcy concentrations than women (pvitamin group, the serum tHcy level was significantly correlated with the levels of folate (r=-0.334, p=0.001) and vitamin B12 (r=-0.212, p=0.046). The MTHFR C677T polymorphism, folate deficiency, and B12 deficiency were significantly associated with elevated serum tHcy levels. Among these three factors, folate deficiency had the greatest contribution to the serum tHcy concentration, followed by (in order of decreasing effect) MTHFR C677T and vitamin B12 deficiency. Thus, folic acid and vitamin B12 supplementation could help prevent diseases associated with tHcy accumulation, especially in individuals with the MTHFR 677TT genotype. Copyright © 2017. Published by Elsevier Taiwan LLC.

  16. Changes in lifestyle and total homocysteine in relation to MTHFR (C677T) genotype: the Inter99 study

    DEFF Research Database (Denmark)

    Husemoen, LL; Thomsen, TF; Fenger, M;

    2006-01-01

    , changes in tHcy did not differ between participants randomized to low- and high-intensity lifestyle intervention. However, the MTHFR TT genotype was associated with a significant decrease in tHcy compared with the CC/CT genotype in which an increase was observed. In addition, changes in tHcy were...... associated with changes in several of the biological CVD risk markers: weight, total cholesterol, HDL cholesterol, LDL cholesterol and systolic blood pressure. CONCLUSIONS: Our results indicate that tHcy may not be reduced by lifestyle changes; additionally, they suggest that tHcy may be related...

  17. Homocysteine-lowering effect of 500 ug folic acid every other day versus 250 ug/day

    NARCIS (Netherlands)

    Brouwer, I.A.; Rooij, van I.A.L.M.; Dusseldorp, van M.; Thomas, C.M.G.; Blom, H.J.; Hautvast, J.G.A.J.; Eskes, T.K.A.B.

    2000-01-01

    Elevated plasma total homocysteine (tHcy) concentrations are a risk factor for neural tube defects and vascular diseases. Supplementation with folic acid decreases tHcy. We investigated whether supplementation with 500 ?g folic acid every other day is as effective in lowering tHcy as 250 ?g folic ac

  18. Simultaneous determination of homocysteine, methionine and cysteine in maternal plasma after delivery by HPLC-fluorescence detection with DBD-F as a label.

    Science.gov (United States)

    Wada, Mitsuhiro; Hirose, Maki; Kuroki, Mana; Ikeda, Rie; Sekitani, Yui; Takamura, Noboru; Kuroda, Naotaka; Nakashima, Kenichiro

    2013-06-01

    An HPLC-fluorescence (FL) method for determination of sulfur-containing amino acids such as homocysteine (Hcy), methionine (Met) and cysteine (Cys) in human plasma was developed. The sulfur-containing amino acids were labeled with 4-(N,N-dimethylaminosulfonyl)-7-fluoro-2,1,3-benzoxadiazole (DBD-F). Calibration curves in the range of 1-100 µm (Hcy and Met) and 5-500 µm (Cys) indicated good linearities (r ≥ 0.998). The limits of detection at a signal-to-noise ratio of 3 were 0.13 (Hcy), 0.02 (Met) and 0.11 µm (Cys), respectively. Acceptable results for accuracy and precision of intra- and inter-day measurements were obtained. The results of Hcy and Cys obtained by the proposed method indicated good correlations with the conventional method (r > 0.911, n = 20). Furthermore, the method was applied to determination of the sulfur-containing amino acids in maternal plasma (n = 200) after delivery. The concentrations of Hcy, Met and Cys as a median (inter quartile range, Q1 and Q3 ) were 5.37 (3.32-7.79) μm, 25.20 (20.10-31.06) μm and 147.25 (102.81-189.31) μm, respectively.

  19. High homocysteine induces betaine depletion.

    Science.gov (United States)

    Imbard, Apolline; Benoist, Jean-François; Esse, Ruben; Gupta, Sapna; Lebon, Sophie; de Vriese, An S; de Baulny, Helene Ogier; Kruger, Warren; Schiff, Manuel; Blom, Henk J

    2015-04-28

    Betaine is the substrate of the liver- and kidney-specific betaine-homocysteine (Hcy) methyltransferase (BHMT), an alternate pathway for Hcy remethylation. We hypothesized that BHMT is a major pathway for homocysteine removal in cases of hyperhomocysteinaemia (HHcy). Therefore, we measured betaine in plasma and tissues from patients and animal models of HHcy of genetic and acquired cause. Plasma was collected from patients presenting HHcy without any Hcy interfering treatment. Plasma and tissues were collected from rat models of HHcy induced by diet and from a mouse model of cystathionine β-synthase (CBS) deficiency. S-adenosyl-methionine (AdoMet), S-adenosyl-homocysteine (AdoHcy), methionine, betaine and dimethylglycine (DMG) were quantified by ESI-LC-MS/MS. mRNA expression was quantified using quantitative real-time (QRT)-PCR. For all patients with diverse causes of HHcy, plasma betaine concentrations were below the normal values of our laboratory. In the diet-induced HHcy rat model, betaine was decreased in all tissues analysed (liver, brain, heart). In the mouse CBS deficiency model, betaine was decreased in plasma, liver, heart and brain, but was conserved in kidney. Surprisingly, BHMT expression and activity was decreased in liver. However, in kidney, BHMT and SLC6A12 expression was increased in CBS-deficient mice. Chronic HHcy, irrespective of its cause, induces betaine depletion in plasma and tissues (liver, brain and heart), indicating a global decrease in the body betaine pool. In kidney, betaine concentrations were not affected, possibly due to overexpression of the betaine transporter SLC6A12 where betaine may be conserved because of its crucial role as an osmolyte.

  20. Development of a rapid, simple assay of plasma total carotenoids

    Directory of Open Access Journals (Sweden)

    Donaldson Michael

    2012-09-01

    Full Text Available Abstract Background Plasma total carotenoids can be used as an indicator of risk of chronic disease. Laboratory analysis of individual carotenoids by high performance liquid chromatography (HPLC is time consuming, expensive, and not amenable to use beyond a research laboratory. The aim of this research is to establish a rapid, simple, and inexpensive spectrophotometric assay of plasma total carotenoids that has a very strong correlation with HPLC carotenoid profile analysis. Results Plasma total carotenoids from 29 volunteers ranged in concentration from 1.2 to 7.4 μM, as analyzed by HPLC. A linear correlation was found between the absorbance at 448 nm of an alcohol / heptane extract of the plasma and plasma total carotenoids analyzed by HPLC, with a Pearson correlation coefficient of 0.989. The average coefficient of variation for the spectrophotometric assay was 6.5% for the plasma samples. The limit of detection was about 0.3 μM and was linear up to about 34 μM without dilution. Correlations between the integrals of the absorption spectra in the range of carotenoid absorption and total plasma carotenoid concentration gave similar results to the absorbance correlation. Spectrophotometric assay results also agreed with the calculated expected absorbance based on published extinction coefficients for the individual carotenoids, with a Pearson correlation coefficient of 0.988. Conclusion The spectrophotometric assay of total carotenoids strongly correlated with HPLC analysis of carotenoids of the same plasma samples and expected absorbance values based on extinction coefficients. This rapid, simple, inexpensive assay, when coupled with the carotenoid health index, may be useful for nutrition intervention studies, population cohort studies, and public health interventions.

  1. Inhibition of homocysteine-induced endoplasmic reticulum stress and endothelial cell damage by l-serine and glycine.

    Science.gov (United States)

    Sim, Woo-Cheol; Han, Inhoi; Lee, Wonseok; Choi, You-Jin; Lee, Kang-Yo; Kim, Dong Gwang; Jung, Seung-Hwan; Oh, Seon-Hee; Lee, Byung-Hoon

    2016-08-01

    Hyperhomocysteinemia is an independent risk factor for several cardiovascular diseases. The use of vitamins to modulate homocysteine metabolism substantially lowers the risk by reducing plasma homocysteine levels. In this study, we evaluated the effects of l-serine and related amino acids on homocysteine-induced endoplasmic reticulum (ER) stress and endothelial cell damage using EA.hy926 human endothelial cells. Homocysteine treatment decreased cell viability and increased apoptosis, which were reversed by cotreatment with l-serine. l-Serine inhibited homocysteine-induced ER stress as verified by decreased glucose-regulated protein 78kDa (GRP78) and C/EBP homologous protein (CHOP) expression as well as X-box binding protein 1 (xbp1) mRNA splicing. The effects of l-serine on homocysteine-induced ER stress are not attributed to intracellular homocysteine metabolism, but instead to decreased homocysteine uptake. Glycine exerted effects on homocysteine-induced ER stress, apoptosis, and cell viability that were comparable to those of l-serine. Although glycine did not affect homocysteine uptake or export, coincubation of homocysteine with glycine for 24h reduced the intracellular concentration of homocysteine. Taken together, l-serine and glycine cause homocysteine-induced endothelial cell damage by reducing the level of intracellular homocysteine. l-Serine acts by competitively inhibiting homocysteine uptake in the cells. However, the mechanism(s) by which glycine lowers homocysteine levels are unclear.

  2. Quantitative, high-resolution epigenetic profiling of CpG loci identifies associations with cord blood plasma homocysteine and birth weight in humans.

    Science.gov (United States)

    Fryer, Anthony A; Emes, Richard D; Ismail, Khaled M K; Haworth, Kim E; Mein, Charles; Carroll, William D; Farrell, William E

    2011-01-01

    Supplementation with folic acid during pregnancy is known to reduce the risk of neural tube defects and low birth weight. It is thought that folate and other one-carbon intermediates might secure these clinical effects via DNA methylation. We examined the effects of folate on the human methylome using quantitative interrogation of 27,578 CpG loci associated with 14,496 genes at single-nucleotide resolution across 12 fetal cord blood samples. Consistent with previous studies, the majority of CpG dinucleotides located within CpG islands exhibited hypo-methylation while those outside CpG islands showed mid-high methylation. However, for the first time in human samples, unbiased analysis of methylation across samples revealed a significant correlation of methylation patterns with plasma homocysteine, LINE-1 methylation and birth weight centile. Additionally, CpG methylation significantly correlated with either birth weight or LINE-1 methylation were predominantly located in CpG islands. These data indicate that levels of folate-associated intermediates in cord blood reflect their influence and consequences for the fetal epigenome and potentially on pregnancy outcome. In these cases, their influence might be exerted during late gestation or reflect those present during the peri-conceptual period.

  3. The oxidative stress may be induced by the elevated homocysteine in schizophrenic patients.

    Science.gov (United States)

    Dietrich-Muszalska, Anna; Malinowska, Joanna; Olas, Beata; Głowacki, Rafal; Bald, Edward; Wachowicz, Barbara; Rabe-Jabłońska, Jolanta

    2012-05-01

    The mechanisms of oxidative stress in schizophrenic patients are not fully understood. In the present study, we investigated the effect of elevated level of homocysteine (Hcys) on some parameters of oxidative stress, namely thiobarbituric acid reactive substances (TBARS), an index of lipid peroxidation in plasma, the level of carbonyl groups in plasma proteins, as well as the amount of 3-nitrotyrosine in plasma proteins isolated from schizophrenic patients. Patients hospitalised in I and II Psychiatric Department of Medical University in Lodz, Poland were interviewed with special questionnaire (treatment, course of diseases, dyskinesis and other EPS). According to DSM-IV criteria all patients had diagnosis of paranoid type. They were treated with antipsychotic drugs (clozapine, risperidone, olanzapine). Mean time of schizophrenia duration was about 5 years. High-performance liquid chromatography was used to analyse the total level of homocysteine in plasma. Levels of carbonyl groups and 3-nitrotyrosine residues in plasma proteins were measured by ELISA and a competition ELISA, respectively. The lipid peroxidation in plasma was measured by the level of TBARS. Our results showed that in schizophrenic patients the amount of homocysteine in plasma was higher in comparison with the control group. We also observed a statistically increased level of biomarkers of oxidative/nitrative stress such as carbonyl groups or 3-nitrotyrosine in plasma proteins from schizophrenic patients. Moreover, our experiments indicate that the correlation between the increased amount of homocysteine and the oxidative stress exists. Considering the data presented in this study, we suggest that the elevated Hcys in schizophrenic patients may stimulate the oxidative stress.

  4. Correlation between vascular dementia and plasma homocysteine levels%血管性痴呆与血浆同型半胱氨酸水平的相关性

    Institute of Scientific and Technical Information of China (English)

    肖玉娴

    2011-01-01

    目的 探讨血浆同型半胱氨酸(Hcy)在血管性痴呆(vasular dementia,VD)发生和发展过程中的作用和意义.方法 测定2008年1月至2009年8月收治的46例VD患者(VD组)的血浆总Hcy水平,并与40例正常同龄对照组及50例非痴呆脑梗死组比较,分析痴呆与Hcy的关系.结果 VD组血浆总Hcy水平显著高于同龄正常对照组和非痴呆脑梗死纽,(29.23±5.42)mmol/L vs(10.24±3.12)mmol/L、(26.24±4.28)mmol/L(P<0.01).结论 高Hcy血症可能是VD发病的一个新的危险因素.%Objective To explore the function and significance of plasma homocysteine(Hcy) in the occurrence and development of vascular dementia(VD).Methods 46 VD patients, 40 normal aged subjects and 50 patients with nondementia cerebral infation were recruited in the study and they were analyzed with MMSE, Hcy,etc.t test was used to evaluate VD and Hcy levels.Results Mean total plasma Hcy concentrations were significantly higher in VD patients than in the normal elderly subjects( P <0.05) and patients with nondementia cerebral infarction, (29.23±5.42)mmol/L vs (10.24±3.12) mmol/L, (26.24±4.28) mmol/L( P <0.01 ).Conclusion Hyperhomocysteinemia may be a new risk factor for VD.

  5. Kinetics of homocysteine metabolism after moderate alcohol consumption

    NARCIS (Netherlands)

    Beulens, J.W.J.; Sierksma, A.; Schaafsma, G.; Kok, F.J.; Struys, E.A.; Jakobs, C.; Hendriks, H.F.J.

    2005-01-01

    Background: Moderate alcohol consumption is associated with a decreased risk of cardiovascular disease. Because plasma homocysteine (tHcy) is considered an independent risk factor for cardiovascular disease and associated with alcohol consumption, the authors investigated the effect of moderate

  6. Homocysteine and Cognitive Performance in Elders with Self-Neglect

    Science.gov (United States)

    Burnett, J.; Smith, S.M.; Aung, K.; Dyer, C.

    2009-01-01

    Elevated plasma homocysteine has been associated with altered cognitive performance in older adults. Elders referred to Adult Protective Services (APS) for self-neglect have been reported to have elevated plasma homocysteine levels and to suffer from cognitive impairment. This study assesses the association, if any, between plasma homocysteine and cognitive performance among elders with self-neglect. Methods: Sixty-five community-living adults, 65 years of age and older, reported to Adult Protective Services for self-neglect and 55 matched controls (matched for age, ethnicity, gender and socio-economic status) consented and participated in this study. The research team conducted in-home comprehensive geriatric assessments which included the mini-mental state exam (MMSE), the 15-item geriatric depression scale (GDS), the Wolf-Klein Clock Drawing Tests (CDT) and a comprehensive nutritional biochemistry panel, which included plasma homocysteine. Student s t tests and Pearson correlations were conducted to assess for bivariate associations. Results: Elders with self-neglect had significantly higher plasma homocysteine levels (M=12.68umol/L, sd=4.4) compared to the controls (M=10.40umol/L, sd=3.61;t=3.21, df=127, p=.002). There were no statistically significant associations between cognitive performance and plasma homocysteine in the self-neglect group, however there was a significant correlation between plasma homocysteine and the CDT among the controls (r=-.296, p=.022). Conclusion: Mean plasma homocysteine levels were significantly higher in elders with self-neglect, however, they do not appear to be related to cognitive performance, indicating that cognitive impairment in elder self-neglect involve mechanisms other than hyperhomocysteinemia. These findings warrant further investigation

  7. Homocysteine and Cognitive Performance in Elders with Self-Neglect

    Science.gov (United States)

    Burnett, J.; Smith, S.M.; Aung, K.; Dyer, C.

    2009-01-01

    Elevated plasma homocysteine has been associated with altered cognitive performance in older adults. Elders referred to Adult Protective Services (APS) for self-neglect have been reported to have elevated plasma homocysteine levels and to suffer from cognitive impairment. This study assesses the association, if any, between plasma homocysteine and cognitive performance among elders with self-neglect. Methods: Sixty-five community-living adults, 65 years of age and older, reported to Adult Protective Services for self-neglect and 55 matched controls (matched for age, ethnicity, gender and socio-economic status) consented and participated in this study. The research team conducted in-home comprehensive geriatric assessments which included the mini-mental state exam (MMSE), the 15-item geriatric depression scale (GDS), the Wolf-Klein Clock Drawing Tests (CDT) and a comprehensive nutritional biochemistry panel, which included plasma homocysteine. Student s t tests and Pearson correlations were conducted to assess for bivariate associations. Results: Elders with self-neglect had significantly higher plasma homocysteine levels (M=12.68umol/L, sd=4.4) compared to the controls (M=10.40umol/L, sd=3.61;t=3.21, df=127, p=.002). There were no statistically significant associations between cognitive performance and plasma homocysteine in the self-neglect group, however there was a significant correlation between plasma homocysteine and the CDT among the controls (r=-.296, p=.022). Conclusion: Mean plasma homocysteine levels were significantly higher in elders with self-neglect, however, they do not appear to be related to cognitive performance, indicating that cognitive impairment in elder self-neglect involve mechanisms other than hyperhomocysteinemia. These findings warrant further investigation

  8. Choline supplementation alters some amino acid concentrations with no change in homocysteine in children with cystic fibrosis and pancreatic insufficiency.

    Science.gov (United States)

    Alshaikh, Belal; Schall, Joan I; Maqbool, Asim; Mascarenhas, Maria; Bennett, Michael J; Stallings, Virginia A

    2016-05-01

    The present study determined the plasma amino acid status in children with cystic fibrosis (CF) and pancreatic insufficiency (PI) in the modern medical and nutritional care setting and investigated the effect of choline supplementation on amino acid status. A total of 110 children aged 5 to 18 years with CF and PI were randomized to receive choline-enriched structured lipid (LYM-X-SORB) or placebo with similar energy and fat content. Plasma amino acids were measured at baseline and 3 and 12 months. We hypothesized that choline supplementation would result in lower plasma homocysteine concentrations in children with CF. At baseline, dietary protein intake was high and the amino acid profile was within laboratory reference ranges in most participants. Alanine and cysteine were elevated in 24% and 36% of participants, respectively. Children with baseline alanine above reference range had improved weight, body mass index, and fat-free mass. Low homocysteine was found in 62% of children 11 years and older. After 3 and 12 months, there was no effect of choline supplementation on methionine or homocysteine status. Compared with placebo, choline supplementation resulted in increased glycine and decreased threonine, histidine, valine, and total branch chained amino acids at 12 months. In conclusion, daily choline supplementation with LYM-X-SORB did not alter methionine-homocysteine metabolism but did result in alterations in other amino acids in children with CF and PI.

  9. Relation of plasma homocysteine with folic acid and vitamine B12 in patients with cerebral infarction%同型半胱氨酸、叶酸及维生素 B12水平与脑梗死发病的危险相关性

    Institute of Scientific and Technical Information of China (English)

    韩顺昌; 郭阳; 孙桂军; 谷月宇

    2002-01-01

    Objective To discuss the relationship of cerebral infarction with hyperhomocysteinemia and the relationship between hyperhomocysteinemia and folic acid and Vitamine B12.Method We measured the concentrations of homocysteine with FIPA(fluorescence polarization immunoassay)and Vitamin B12 and folic acid with chemiluminescent competitive immunoassay in 40 cerebral infarction patients and 30 healthy controls.Results The concentration of homocysteine in study group was higher than the controls' (P< 0.01).Serum folic acid level in study group was lower than that in control group (P< 0.05).There is negative correlation between plasma homocysteine and serum folic acid(P< 0.05). Conclusions Hyperhomocysteinemia is an independent risk factor of atherosclerotic cerebral infarction.One reason of increased level of homocysteine in blood is that the deficiency of cofactors of enzymes involved in metabolism process.

  10. Spectrophotometric and Refractometric Determination of Total Protein in Avian Plasma

    Directory of Open Access Journals (Sweden)

    Rodica Căpriță

    2013-10-01

    Full Text Available The aim of this study was to compare the total protein values obtained in heparin plasma of chickens by a spectrophotometric technique (biuret method, and the values obtained on the same day in the same samples by refractometry. The results obtained by refractometry (average value 2.638±0.153g% were higher than those obtained by the spectrophotometric method (average value 2.441±0.181g%. There was a low correlation (r = 0.6709 between the total protein values, determined with both methods. Protein is the major determinant of plasma refractive index, but glucose contributes too. The refractometric method is not recommended in chickens for the determination of total protein, because avian blood glucose concentration averages about twice than in mammalian blood.

  11. Methylenetetrahydrofolate reductase (MTHFR C677T polymorphism and high plasma homocysteine in chronic hepatitis C (CHC infected patients from the Northeast of Brazil

    Directory of Open Access Journals (Sweden)

    Silva Filipe

    2011-08-01

    Full Text Available Abstract Background/Aim Hyperhomocysteinemia due to Methylenetetrahydrofolate Reductase (MTHFR gene, in particular the C677T (Ala222Val polymorphism were recently associated to steatosis and fibrosis. We analyzed the frequency of MTHFR gene in a cross-sectional study of patients affected by Chronic Hepatitis C (CHC from Northeast of Brazil. Method One hundred seven-four untreated patients with CHC were genotyped for the C677T MTHFR. Genomic DNA was extracted from peripheral blood cells and the C677T MTHFR polymorphism was identified by PCR-RFLP. The homocysteine (Hcy levels were determined by chemiluminescence method. All patients were negative for markers of Wilson's disease, hemochromatosis and autoimmune diseases and have current and past daily alcohol intake less than 100 g/week. Results Among subjects infected with CHC genotype non-1 the frequency of MTHFR genotypes TT was 9.8% versus 4.4% genotype 1 (p = 0.01. Nevertheless, association was found between the MTHFR genotype TT × CT/CC polymorphism and the degree of steatosis and fibrosis in both hepatitis C genotype (p Conclusion Our results indicate that plasma Hcy levels is highly prevalent in subjects with chronic hepatits C with steatosis regardless of HCV genotype and vitamin deficiency. The presence of genotype TT of MTHFR C677T polymorphism was more common in CHC genotype non-1 infected patient regardless of histopathological classification and genotype TT+CT frequencies were significant in the presence of fibrosis grade 1+2 and of steatosis in CHC infected patients from the northeast of Brazil regardless of HCV genotype. The genetic susceptibility of MTHFR C677T polymorphism should be confirmed in a large population.

  12. Clinical use and rational management of homocysteine, folic acid, and B vitamins in cardiovascular and thrombotic diseases.

    Science.gov (United States)

    Stanger, O; Herrmann, W; Pietrzik, K; Fowler, B; Geisel, J; Dierkes, J; Weger, M

    2004-06-01

    About half of all deaths are due to cardiovascular disease and its complications. The economic burden on society and the healthcare system from cardiovascular disability, complications, and treatments is huge and becoming larger in the rapidly aging populations of developed countries. As conventional risk factors fail to account for part of the cases, homocysteine, a "new" risk factor, is being viewed with mounting interest. Homocysteine is a sulfur-containing intermediate product in the normal metabolism of methionine, an essential amino acid. Folic acid, vitamin B(12), and vitamin B(6) deficiency and reduced enzyme activities inhibit the breakdown of homocysteine, thus increasing the intracellular homocysteine concentration. Numerous retrospective and prospective studies have consistently found an independent relationship between mild hyperhomocysteinemia and cardiovascular disease or all-cause mortality. Starting at a plasma homocysteine concentration of approximately 10 micromol/l, the risk increase follows a linear dose-response relationship with no specific threshold level. Hyperhomocysteinemia as an independent risk factor for cardiovascular disease is thought to be responsible for about 10 percent of total risk. Elevated plasma homocysteine levels (> 12 micromol/l; moderate hyperhomocysteinemia) are considered cytotoxic and are found in 5 to 10 percent of the general population and in up to 40 percent of patients with vascular disease. Additional risk factors (smoking, arterial hypertension, diabetes, and hyperlipidemia) may additively or, by interacting with homocysteine, synergistically (and hence overproportionally) increase overall risk. Hyperhomocysteinemia is associated with alterations in vascular morphology, loss of endothelial antithrombotic function, and induction of a procoagulant environment. Most known forms of damage or injury are due to homocysteine-mediated oxidative stresses. Especially when acting as direct or indirect antagonists of

  13. B-vitamin therapy for kidney transplant recipients lowers homocysteine and improves selective cognitive outcomes in the randomized FAVORIT ancillary cognitive trial

    Science.gov (United States)

    BACKGROUND: Objectives: Elevated plasma total homocysteine (tHcy) is associated with increased risk of cardiovascular disease, stroke and dementia. Results of clinical trials using B-vitamins to reduce the cognitive risks attributed to tHcy have been inconsistent. The high prevalence of both hyperho...

  14. Association between plasma thiols and immune activation marker neopterin in stable coronary heart disease.

    Science.gov (United States)

    Schroecksnadel, Katharina; Walter, Roland B; Weiss, Guenter; Mark, Michael; Reinhart, Walter H; Fuchs, Dietmar

    2008-01-01

    Studies have associated elevated plasma levels of the thiols homocysteine and cysteine with an increased risk of atherosclerosis. Their relationship with systemic inflammatory parameters and sclerosis scores was investigated in this study. Total homocysteine, total cysteine, neopterin and C-reactive protein (CRP) concentrations were measured in blood samples of 242 patients undergoing elective coronary angiography. A total of 181 patients had coronary artery disease (CAD), as defined by occlusion of > 75% of at least one of the three main coronary arteries, and 61 subjects did not have relevant coronary stenoses. Total cysteine concentrations were higher in patients suffering from coronary artery sclerosis with stepwise increases relative to the extent of coronary artery sclerosis (p < 0.001). In contrast, neither total homocysteine nor the inflammatory markers, CRP and neopterin, differed between patients and controls. However, total homocysteine concentrations correlated with total cysteine (r = 0.468) and neopterin concentrations (r = 0.290), as well as serum creatinine (r = 0.226; all p < 0.001), the latter indicating a dependence of total homocysteine concentrations on kidney function. Total cysteine concentrations were associated with increased neopterin levels (r = 0.231, p < 0.001). Total cysteine concentrations were well suited to estimate the extent of coronary artery sclerosis, while in our study of stable CAD patients total homocysteine was not increased compared to controls. The association between homocysteine, cysteine and parameters of immune activation and inflammation in our study suggests that these markers of CAD may be interdependent.

  15. Spectrophotometric and Refractometric Determination of Total Protein in Avian Plasma

    OpenAIRE

    2013-01-01

    The aim of this study was to compare the total protein values obtained in heparin plasma of chickens by a spectrophotometric technique (biuret method), and the values obtained on the same day in the same samples by refractometry. The results obtained by refractometry (average value 2.638±0.153g%) were higher than those obtained by the spectrophotometric method (average value 2.441±0.181g%). There was a low correlation (r = 0.6709) between the total protein values, determined with both methods...

  16. Accurate measurement of the essential micronutrients methionine, homocysteine, vitamins B6, B12, B9 and their metabolites in plasma, brain and maternal milk of mice using LC/MS ion trap analysis.

    Science.gov (United States)

    Oosterink, J Efraim; Naninck, Eva F G; Korosi, Aniko; Lucassen, Paul J; van Goudoever, Johannes B; Schierbeek, Henk

    2015-08-15

    Methionine, homocysteine, vitamins B6, B12, B9, and their metabolites are crucial co-factors and substrates for many basic biological pathways including one-carbon metabolism, and they are particularly important for brain function and development and epigenetic mechanisms. These are essential nutrients that cannot be synthesized endogenously and thus need to be taken in via diet. A novel method was developed that enables simultaneous assessment of the exact concentrations of these essential micronutrients in various matrices, including maternal milk, plasma, and brain of neonatal mice. The protocol for analysis of these components in the various matrices consists of a cleanup step (i.e. lipid extraction followed by protein precipitation) combined with a liquid chromatography mass spectrometry (LC/MS) ion trap method with high sensitivity and selectivity (SRM mode). This novel method enables the measurement of these essential nutrients with good recoveries (69-117%), and high intra-day (milk, and brain of mice at low and high levels. In addition, lower limits of quantitation (LOQ) were determined for the various matrices in the range for methionine (700-2000nmol/L), homocysteine (280-460-nmol/L), vitamins B6 (5-230nmol/L), B12 (7-11nmol/L), B9 (20-30nmol/L). Degradation of vitamins and oxidation of homocysteine is limited to a minimum, and only small sample volumes (30μL plasma, 20mg brain and maternal milk) are needed for simultaneous measurement. This method can help to understand how these nutrients are transferred from mother to offspring via maternal milk, as well as how these nutrients are absorbed by the offspring and eventually taken up in various tissues amongst the brain in preclinical and clinical research settings. Therefore the method can help to explore critical periods in lactating mothers and developing offspring.

  17. Low plasma carnitine in patients on prolonged total parenteral nutrition: association with low plasma lysine.

    Science.gov (United States)

    Berner, Y N; Larchian, W A; Lowry, S F; Nicroa, R R; Brennan, M F; Shike, M

    1990-01-01

    Plasma carnitine levels were determined in 17 patients maintained on long-term total parenteral nutrition (TPN) for a mean (+/- SEM) period of 69 +/- 11 months (range 12-196). All had severe malabsorption and were dependent on intravenous feeding. Plasma carnitine was determined by a modified Cederblad enzymatic method. Mean plasma carnitine was significantly below the mean normal for females (p less than 0.02) and borderline low for males (p = 0.07). In six patients the levels were below the low normal range, and in five others they were at the lowest levels of normal. Of the six patients with normal levels, three had elevated serum creatinine, indicating renal dysfunction which may by itself elevate plasma carnitine. In 10 patients the plasma levels of lysine (a carnitine precursor) were determined and found to be lower than normal (p less than 0.05). Plasma carnitine levels correlated positively with serum albumin (r = 0.62, p less than 0.05), and negatively with serum alkaline phosphatase (r = -0.64, p less than 0.05). Thus, patients maintained on long-term TPN may have low plasma carnitine, which could represent carnitine deficiency. The low plasma carnitine may be related to a deficiency of the carnitine precursor lysine. Further studies are required to determine the significance of the low plasma carnitine and whether carnitine supplementation should be required in long-term TPN.

  18. Serum nitric oxide and homocysteine as biomarkers of ectopic pregnancy

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    Kavitha Meiyappan

    2015-02-01

    Full Text Available Background: Aim of current study was to evaluate the role of serum homocysteine and nitric oxide in the diagnosis of ectopic pregnancy. Methods: The study included 32 patients with ruptured ectopic, 29 miscarriage patients and 30 normal pregnant women as controls. Fasting plasma homocysteine, serum folate, vitamin B12 levels and nitric oxide levels were estimated at the time of admission. Results: Plasma homocysteine levels were significantly lower in patients with ectopic pregnancy than normal pregnancy. Nitric oxide levels were significantly lower in patients with abortion. Conclusions: Patients with abortion have decreased circulating nitric oxide levels in serum while those with ectopic pregnancies have decreased homocysteine levels. [Int J Reprod Contracept Obstet Gynecol 2015; 4(1.000: 66-70

  19. Homocysteine and alcoholism.

    Science.gov (United States)

    Bleich, S; Degner, D; Javaheripour, K; Kurth, C; Kornhuber, J

    2000-01-01

    Chronic alcohol consumption can induce alterations in the function and morphology of most if not all brain systems and structures. However, the exact mechanism of brain damage in alcoholics remains unknown. Partial recovery of brain function with abstinence suggests that a proportion of the deficits must be functional in origin (i.e. plastic changes of nerve cells) while neuronal loss from selected brain regions indicates permanent and irreversible damage. There is growing evidence that chronic alcoholism is associated with a derangement in the sulfur amino acid metabolism. Recently, it has been shown that excitatory amino acid (EAA) neurotransmitters and homocysteine levels are elevated in patients who underwent withdrawal from alcohol. Furthermore, it has been found that homocysteine induces neuronal cell damage by stimulating NMDA receptors as well as by producing free radicals. Homocysteine neurotoxicity via overstimulation of N-methyl-D-aspartate receptors may contribute to the pathogenesis of both brain shrinkage and withdrawal seizures linked to alcoholism.

  20. Association of Homocysteine, Vitamin and Blood Factors with Preeclampsia in Pregnant Women

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    M Nadafi

    2010-07-01

    Full Text Available Introduction & Objective: Preeclampsia is a disease with worldwide importance to mothers and infants, where it accounts for 20–80% of the strikingly increased maternal mortality. The lack of enzymes added to the homocysteine metabolism or the cofactors necessary for its metabolism (folate, B6 vitamin, B12 vitamin cause hyperhomocysteinemia. Abnormal serum lipid profiles such as cholesterol, LDL, HDL and triglyceride are associated with endothelial dysfunction. Recently high levels of B-HCG have been identified as a potential marker for developing preeclampsia. The purpose of this study was to identify the possible association of homocysteine, vitamin and some serum factors levels with preeclampsia in pregnant women. Materials and Methods: A case control study was performed prospectively on normotensive healthy pregnant women (80 and pregnant women diagnosed with preeclampsia (80 referring to Imam Sadjad hospital in Yasuj, between September 2004 to August 2005. In addition to the obstetric evaluation and laboratory examination in the 3rd trimester of gestation, blood samples were taken from all cases for homocysteine and vitamin B12, folic acid, triglyceride, cholesterol, LDL, HDL, B-HCG analysis. The samples were evaluated by Immunoassay (ELISA. Univariant and logistic regression analyses were used to identify predictors of outcomes. Results: The mean plasma level of total homocysteine was significantly higher in preeclamptic women compared with normal pregnancy(p0.05. Triglyceride and cholesterol levels were significantly higher in preeclamptic women compared with normal pregnant women(p<0/05. LDL and HDL levels were not correlated with preeclampsia. There was no significant association between preeclampsia and B-HCG levels. Conclusion: Homocysteine, triglyceride and cholesterol concentrations increase in preeclampsia but decrease of vitamin B12 and folic acid levels was not observed in preeclampsia. LDL, HDL and B-HCG levels were not

  1. Association of homocysteine and methylene tetrahydrofolate reductase (MTHFR C677T gene polymorphism with coronary artery disease (CAD in the population of North India

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    Rajneesh Tripathi

    2010-01-01

    Full Text Available The implications of the methylene tetrahydrofolate reductase (MTHFR gene and the level of homocysteine in the pathogenesis of coronary artery disease (CAD have been extensively studied in various ethnic groups. Our aim was to discover the association of MTHFR (C677T polymorphism and homocysteine level with CAD in north Indian subjects. The study group consisted of 329 angiographically proven CAD patients, and 331 age and sex matched healthy individuals as controls. MTHFR (C677T gene polymorphism was detected based on the polymerase chain reaction and restriction digestion with HinfI. Total homocysteine plasma concentration was measured using immunoassay. T allele frequency was found to be significantly higher in patients than in the control group. We found significantly elevated levels of mean homocysteine in the patient group when compared to the control group (p = 0.00. Traditional risk factors such as diabetes, hypertension, smoking habits, a positive family history and lipid profiles (triglyceride, total cholesterol, HDL-cholesterol, LDL-cholesterol, VLDL-cholesterol, were found significantly associated through univariate analysis. Furthermore, multivariable logistics regression analysis revealed that CAD is significantly and variably associated with diabetes, hypertension, smoking, triglycerides and HDL-cholesterol. Our findings showed that MTHFR C677T polymorphism and homocysteine levels were associated with coronary artery disease in the selected population.

  2. Decreased serum homocysteine levels after micronutrient supplementation in older people

    Directory of Open Access Journals (Sweden)

    Pusparini Pusparini

    2016-02-01

    Full Text Available Aging is associated with a gradual impairment in cognitive function. The elderly also show a high prevalence of undernutrition, whereas nutrition plays an important role in the metabolism of neuronal cells and enzymes. Homocysteine is an amino acid resulting from methionine metabolism and is dependent on intake of vitamin B12, vitamin B6 and folic acid. Homocysteine is said to play a role in cognitive function. The objective of this study was to evaluate the effect of micronutrient supplementation for 6 months on serum homocysteine levels and cognitive function in older people. This study was an experimental study of pre-post test design, carried out in Mampang subdistrict, South Jakarta. A total of 94 elderly people was recruited for this study, consisting of 44 females and 50 males. Serum homocysteine level was assessed by fluorescent polarization immunoassay and cognitive function by means of the mini mental state examination (MMSE before and after micronutrient supplementation. Mean serum homocysteine concentration after supplementation decreased significantly to 14.8 ± 5.8 mmol/L, compared with mean serum homocysteine level of 15.9 ± 5.9 mmol/L before supplementation (p=0.000. Multiple regression analysis indicated that the factors influencing post-supplementation MMSE scores were gender (â=-0.350; p=0.000, education (â=0.510; p=0.000 and post-supplementation homocysteine levels (â=-0.201; p=0.000, while age, pre-supplementation homocysteine levels and BMI did not affect MMSE scores. Homocysteine concentration decreased significantly after 6 months of supplementation. The factors affecting post-supplementation MMSE scores were gender, level of education, and post-supplementation homocysteine level.

  3. Cognitive Impairment in Folate-Deficient Rats Corresponds to Depleted Brain Phosphatidylcholine and Is Prevented by Dietary Methionine without Lowering Plasma Homocysteine12

    OpenAIRE

    Troen, Aron M.; Chao, Wei-Hsun; Crivello, Natalia A.; D'Anci, Kristen E.; Shukitt-Hale, Barbara; Don E Smith; Selhub, Jacob; Rosenberg, Irwin H

    2008-01-01

    Poor folate status is associated with cognitive decline and dementia in older adults. Although impaired brain methylation activity and homocysteine toxicity are widely thought to account for this association, how folate deficiency impairs cognition is uncertain. To better define the role of folate deficiency in cognitive dysfunction, we fed rats folate-deficient diets (0 mg FA/kg diet) with or without supplemental L-methionine for 10 wk, followed by cognitive testing and tissue collection for...

  4. Uremic Restless Legs Syndrome (RLS and Sleep Quality in Patients With End-Stage Renal Disease on Hemodialysis: Potential Role of Homocysteine and Parathyroid Hormone

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    Katrin Gade

    2013-10-01

    Full Text Available Background: The aetiology of uremic restless legs syndrome (RLS remains unclear. Our research investigated whether an elevated plasma concentration of the excitatory amino acid homocysteine might be associated with RLS occurrence in patients with chronic renal insufficiency on hemodialysis. Methods: Total plasma homocysteine as well as creatinine, urea, folate, parathyroid hormone, hemoglobin, iron, ferritin, phosphate, calcium, magnesium, and albumin levels were compared between 26 RLS-affected (RLSpos and 26 non-affected (RLSneg patients on chronic hemodialysis. We further compared subjective sleep quality between RLSpos and RLSneg patients using the Pittsburgh-Sleep-Quality-Index and investigated possible relationships between laboratory parameters and sleep quality. Results: Taking individual albumin concentrations into account, a significant positive correlation between total plasma homocysteine and RLS occurrence was observed (r= 0.246; p=0.045. Sleep quality was significantly more reduced in RLSpos compared to RLSneg patients and RLS severity correlated positively with impairment of sleep quality. Bad sleep quality in all patients was associated with higher concentrations of parathyroid hormone. Conclusion: Our results suggest a possible aetiological role of homocysteine in uremic RLS. They confirm that uremic RLS is an important factor causing sleep impairment in patients on hemodialysis. Higher parathyroid hormone levels might also be associated with bad sleep quality in these patients.

  5. Changes in Plasma Lipids during Exposure to Total Sleep Deprivation.

    Science.gov (United States)

    Chua, Eric Chern-Pin; Shui, Guanghou; Cazenave-Gassiot, Amaury; Wenk, Markus R; Gooley, Joshua J

    2015-11-01

    The effects of sleep loss on plasma lipids, which play an important role in energy homeostasis and signaling, have not been systematically examined. Our aim was to identify lipid species in plasma that increase or decrease reliably during exposure to total sleep deprivation. Twenty individuals underwent sleep deprivation in a laboratory setting. Blood was drawn every 4 h and mass spectrometry techniques were used to analyze concentrations of 263 lipid species in plasma, including glycerolipids, glycerophospholipids, sphingolipids, and sterols. Chronobiology and Sleep Laboratory, Duke-NUS Graduate Medical School. Healthy ethnic-Chinese males aged 21-28 y (n = 20). Subjects were kept awake for 40 consecutive hours. Each metabolite time series was modeled as a sum of sinusoidal (circadian) and linear components, and we assessed whether the slope of the linear component differed from zero. More than a third of all individually analyzed lipid profiles exhibited a circadian rhythm and/or a linear change in concentration during sleep deprivation. Twenty-five lipid species showed a linear and predominantly unidirectional trend in concentration levels that was consistent across participants. Choline plasmalogen levels decreased, whereas several phosphatidylcholine (PC) species and triacylglycerides (TAG) carrying polyunsaturated fatty acids increased. The decrease in choline plasmalogen levels during sleep deprivation is consistent with prior work demonstrating that these lipids are susceptible to degradation by oxidative stress. The increase in phosphatidylcholines and triacylglycerides suggests that sleep loss might modulate lipid metabolism, which has potential implications for metabolic health in individuals who do not achieve adequate sleep. © 2015 Associated Professional Sleep Societies, LLC.

  6. Changes in total plasma content of electrolytes and proteins with maximal exercise.

    Science.gov (United States)

    Van Beaumont, W.; Strand, J. C.; Petrofsky, J. S.; Hipskind, S. G.; Greenleaf, J. E.

    1973-01-01

    To determine to what extent the increases in concentration of plasma proteins and electrolytes with short maximal work were a result of hemoconcentration, the changes in plasma volume and total content of the plasma constituents were simultaneously evaluated. The results obtained from six human subjects indicated that in comparison to preexercise values there was a net decrease in total content of plasma protein, sodium, and chloride in the first 2 min of the postexercise period, due primarily to a significant loss (13-15%) of plasma fluid. The total plasma potassium content was increased immediately after exercise but was significantly below the preexercise plasma content after 2 min of recovery.

  7. The Independent and Joint Association of Blood Pressure, Serum Total Homocysteine, and Fasting Serum Glucose Levels With Brachial-Ankle Pulse Wave Velocity in Chinese Hypertensive Adults.

    Science.gov (United States)

    Liu, Xiaoyun; Sun, Ningling; Yu, Tao; Fan, Fangfang; Zheng, Meili; Qian, Geng; Wang, Binyan; Wang, Yu; Tang, Genfu; Li, Jianping; Qin, Xianhui; Hou, Fanfan; Xu, Xiping; Yang, Xinchun; Chen, Yundai; Wang, Xiaobin; Huo, Yong

    2016-09-28

    This study aimed to investigate the independent and joint association of blood pressure (BP), homocysteine (Hcy), and fasting blood glucose (FBG) levels with brachial-ankle pulse wave velocity (baPWV, a measure of arterial stiffness) in Chinese hypertensive adults.The analyses included 3967 participants whose BP, Hcy, FBG, and baPWV were measured along with other covariates. Systolic BP (SBP) was analyzed as 3 categories (SBP < 160 mmHg; 160 to 179 mmHg; ≥ 180 mmHg); Hcy as 3 categories (< 10 μmol/L; 10 to 14.9 μmol/L; ≥ 15.0 μmol/L) and FBG: normal (FBG < 5.6 mmol/L), impaired (5.6 mmol/L ≤ FBG < 7.0 mmol/L), and diabetes mellitus (FBG ≥ 7.0 mmol/L). We performed linear regression analyses to evaluate their associations with baPWV with adjustment for covariables.When analyzed individually, BP, Hcy, and FBG were each associated with baPWV. When BP and FBG were analyzed jointly, the highest baPWV value (mean ± SD: 2227 ± 466 cm/s) was observed in participants with FBG ≥ 7.0 mmol/L and SBP ≥ 180 mmHg (β = 432.5, P < 0.001), and the lowest baPWV value (mean ± SD: 1692 ± 289 cm/s) was seen in participants with NFG and SBP < 160 mmHg. When Hcy and FBG were analyzed jointly, the highest baPWV value (2072 ± 480 cm/s) was observed in participants with FBG ≥ 7.0 mmol/L and Hcy ≥ 15.0 μmol/L (β = 167.6, P < 0.001), while the lowest baPWV value (mean ± SD: 1773 ± 334 cm/s) was observed in participants with NFG and Hcy < 10 μmol/L.In Chinese hypertensive adults, SBP, Hcy, and FBG are individually and jointly associated with baPWV.Our findings underscore the importance of identifying individuals with multiple risk factors of baPWV including high SBP, FBG, and Hcy.

  8. Effect of Homocysteine ,Vitamin B12 , Folic acid during pregnancy

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    Arpita Patel

    2012-07-01

    Full Text Available Vitamin B12, folic acid and homocysteine are metabolically closely related. At the same time homocysteine is found to be offending factor for vascular pathology causing preeclampsia. On the other hand periconceptional nutritional status influences the vitamin B12 & folic acid level. Which further affect the homocysteine level thus may affect pregnancy outcome. Various contributory factors lead these vitamin deficiencies, maternal nutrition is one of them. Ahmedabad being a predominantly vegetarian city, its population is at higher risk of vitamin B12 deficiency. But no systematic study has been done in Ahmedabad to know whether B12, folic acid and homocysteine levels influence pregnancy. To know this answer this study was planned to know total homocysteine level and its correlation in preeclampsia and normotensive pregnant women.Vitamin B12, folic acid and homocysteine were measured in all the subjects using fluorescence polarized immunoassay in AxSym Immunochemistry analyzer on 60 non vitamin supplemented vegetarian women. Vitamin levels were within lower normal limit. Homocysteine level was higher among preeclampsia patient. From the findings of the present study it can be concluded that measurement of these biochemical parameter in ante natal care are useful for further management and prevention of complication of pregnancy like preeclampsia

  9. Homocysteine levels -before and after methionine loading- in 51 Dutch families

    NARCIS (Netherlands)

    Heijer, den M.; Graafsma, S.; Lee, S.Y.; Verhoef, P.

    2005-01-01

    Elevated levels of homocysteine are a risk factor for vascular disease, thrombosis, neural tube defects and dementia. The 677C>T polymorphism in the methylenetetrahydrofolate reductase (MTHFR) gene appears to be the most important single determinant of plasma homocysteine concentration. In the

  10. Hormonal regulation of total antioxidant capacity in seminal plasma.

    Science.gov (United States)

    Mancini, Antonio; Festa, Roberto; Silvestrini, Andrea; Nicolotti, Nicola; Di Donna, Vincenzo; La Torre, Giuseppe; Pontecorvi, Alfredo; Meucci, Elisabetta

    2009-01-01

    Infertility is associated with oxidative stress, normally counterbalanced by different antioxidant systems. In order to explore the hormonal control of seminal plasma total antioxidant capacity (TAC) we evaluated TAC and hormone patterns in a group of unselected infertile patients and control subjects. One hundred and ten infertile patients (divided into 3 groups: inflammation, varicocele, and other etiologies) and 31 fertile men were examined, evaluating blood serum gonadotropins, testosterone, estradiol, free tri-iodothyronine, free tetraiodothyronine (FT4), thyrotropin, prolactin (PRL), seminal parameters, and TAC. TAC was measured using the H(2)O(2)-metmyoglobin system, which generates the spectroscopically detectable radical cation of the chromogenous compound 2,2(I)-azinobis (3-ethylbenzothiazoline-6-sulfonate). The "lag time" of its appearance is proportional to the antioxidant activity. Lag phase was significantly higher in varicocele vs controls, whereas it was lower in patients with inflammation vs varicocele or other kinds of infertility. The correlation analysis between hormones and seminal parameters showed an inverse correlation between PRL and sperm motility, and a direct correlation of TAC with PRL and FT4, but not with gonadotropins or gonadal steroids. Our data suggest that systemic hormones may play a role in regulating seminal antioxidant capacity. This is interesting also because some hormones, such as thyroid and pituitary hormones, are not usually tested in the first-level evaluation of male patients with fertility problems.

  11. Homocysteine and Psychiatric Disorders

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    Vanessa Cavalcante da Silva PhD

    2017-03-01

    Full Text Available Psychiatric disorders are highly prevalent all over the world with a great impact on public health. Altered homocysteine metabolism is implicated in the pathogenesis of many of these disorders, as it can interfere in normal methylation of subcellular components, promote neuroexcitotoxicity, and induce oxidative stress and inflammation. There are cumulative data implicating these mechanisms in the development of autism, schizophrenia, depression, bipolar disorder, and Alzheimer disease. Altered homocysteine metabolism is multifactorial in its origin. On one hand, genetic factors act as predisposing factors through brain development and function, and on the other hand, environmental factors give the opportunity for nutritional interventions improving metabolic status and possibly also clinical parameters. This article provides a review on the association of 1-carbon metabolism and autism, schizophrenia, depression, bipolar disorder, and dementia and goes through studies on the role of different cofactors and metabolites involved in this pathway.

  12. Homocysteine and C-Reactive Protein as Useful Surrogate Markers for Evaluating CKD Risk in Adults

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    Chung-Hsun Chuang

    2013-10-01

    Full Text Available Background/Aims: This study aimed to evaluate the effectiveness of homocysteine and C-reactive protein (CRP as potential markers for chronic kidney disease (CKD in adults in Taiwan, and to identify associations between these factors and CKD, stratifying by gender. Methods: This cross-sectional study analyzed multi-center data retrospectively. Data were collected from 22,043 adult Taiwanese at Chang-Gung Memorial Hospital from 2005 to 2011. Smoking/drinking history, personal medical/medication history, pregnancy, fasting times as well as laboratory parameters, including homocysteine and CRP were measured and analyzed. Results: Significant differences were observed between four homocysteine and CRP quartiles in eGFR and CKD. For males, only one model showed significant associations between plasma homocysteine and CKD, while in females, all three models showed significant associations with CKD. On the contrary, the gender difference in the case of CRP was opposite. Combined homocysteine and CRP were associated with CKD in males but not in females. Conclusion: Among Taiwanese adults, plasma homocysteine is associated with CKD in females and plasma hsCRP is associated with CKD in males. High hsCRP/high homocysteine is associated with elevated CKD risk in male. Our results suggest that homocysteine and hsCRP may be useful surrogate markers for evaluating CKD risk in adults.

  13. Plasma YKL-40 and total and disease-specific mortality in the general population

    DEFF Research Database (Denmark)

    Johansen, Julia S; Bojesen, Stig E; Tybjaerg-Hansen, Anne

    2010-01-01

    Increased plasma YKL-40 is associated with short-term survival in patients with cardiovascular disease and cancer. We tested the hypothesis that increased plasma YKL-40 is associated with total and disease-specific mortality in the general population....

  14. Plasma total antioxidant capacity is associated with dietary intake and plasma level of antioxidants in postmenopausal women.

    Science.gov (United States)

    Wang, Ying; Yang, Meng; Lee, Sang-Gil; Davis, Catherine G; Kenny, Anne; Koo, Sung I; Chun, Ock K

    2012-12-01

    Increased plasma total antioxidant capacity (TAC) has been associated with a high consumption of fruits and vegetables. However, limited information is available on whether plasma TAC reflects the dietary intake of antioxidants and the levels of individual antioxidants in plasma. By using three different assays, the study aimed to determine if plasma TAC can effectively predict dietary intake of antioxidants and plasma antioxidant status. Forty overweight and apparently healthy postmenopausal women were recruited. Seven-day food records and 12-h fasting blood samples were collected for dietary and plasma antioxidant assessments. Plasma TAC was determined by vitamin C equivalent antioxidant capacity (VCEAC), ferric-reducing ability of plasma (FRAP) and oxygen radical absorbance capacity (ORAC) assays. TAC values determined by VCEAC were highly correlated with FRAP (r=0.79, Pantioxidants and represents more closely the plasma antioxidant levels than ORAC and FRAP.

  15. AB156. Homocysteine and vitamin B12: risk factors for erectile dysfunction

    Science.gov (United States)

    Lu, Zheng; Mo, Zengnan

    2014-01-01

    Background Increasing levels of homocysteine (Hcy) is associated with cardiovascular disease, and erectile dysfunction (ED) has close relation with cardiovascular disease, therefore, high homocysteine may be one of the risk factors of ED. During the metabolism of homocysteine, vitamin B12 plays an important role and could be the main factor in causing erectile dysfunction as well. Purpose To investigate the relationship between Hcy, vitamin B12 and ED in sample. Methods The study included 1,457 men aged 20-69 who participated in a series of physical examination at the Medical Centre in Fangchenggang First People’s Hospital from September 2009 to December 2009. ED was identified by the five-item International Index of Erectile Function (IIEF-5) questionnaire. All participants were measured for plasma Hcy, vitamin B12, folic acid, systolic blood pressure (SBP), diastolic blood pressure (DBP), body mass index (BMI), fasting plasma glucose, triglyceride and high-density lipoprotein cholesterol (HDL). Smoking, alcoholic drinking and physical activity were collected by face to face communication. Results A total of 691 (47.4%) men were identified as ED in this study, participants with ED were older or more likely to drink alcohol than the non-ED. It was higher Hcy (P=0.032), vitamin B12 (P=0.008) and fasting plasma glucose (P=0.014) in the participants with ED. There were significant positive correlation between ED status (none, mile, moderate and severe) and Hcy (P=0.024), vitamin B12 (P=0.015) and fasting plasma glucose (P=0.002). Logistic regression analysis showed that age, Hcy and vitamin B12 were the main determinants in ED. Hcy was positively associated with ED in the men more than 45, but vitamin B12 was positively related with ED in the men less than 45. Conclusions Hcy was positively associated with ED in elder, however, vitamin B12 was positively related with ED in younger.

  16. PLATELET RICH PLASMA (PRP) APPLICATION IN TOTAL KNEE ARTHROPLASTY (TKA)

    OpenAIRE

    2015-01-01

    PURPOSE: To find out the PRP application effects in TKA on pain syndrome, wound healing, postoperative blood loss, range of motion and the knee circumference (centimetry). MATERIAL AND METHOD: The preparation of the platelet-rich plasma is based on our treatment algorithm. 20 patients have been subject to TKA within the period from October 2012 to November 2014 and underwent TKA, as platelet rich plasma was used intraoperatively. The average patient age is 72,3; 9 male and 11 female patien...

  17. Serum homocysteine level in gestational diabetes: a prospective study

    Directory of Open Access Journals (Sweden)

    Davari Tanha F

    2009-08-01

    Full Text Available "n Normal 0 false false false EN-US X-NONE AR-SA MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:Arial; mso-bidi-theme-font:minor-bidi;} Background: Increased total plasma homocysteine (Hcy is an accepted risk factor of cardiovascular disease (CVD, stroke, preclampsia, recurrent abortion and diabetes type I and II. The aim of the current study was to assess serum homocysteine and its relation with serum folat, vitamine B12 and lipid profile in gestational diabetes mellitus and to compare these with those of pregnant women."n"n Methods: In a prospective controlled survey 80 pregnant women (24-28 weeks with uncomplicated pregnancies were evaluated. They were assigned to one of two groups according to the results of 100g-OGTT. In the case group there were pregnant women with gestational diabetes mellitus according to the OGTT and in the control group women who had normal OGTT results were put. Levels of fasting glucose, homocysteine, vit B12, and folic acid, uric acid, total cholesterol, triglyceride, Low Density Lipoprotein cholesterol (LDL and High Density Lipoprotein cholesterol (HDL were measured in both groups."n"nResults: The mean level of homocysteine in GDM group was significantly higher than control group (p=0.000. The mean level of folic acid and vit B12 was significantly lower than the level in control group (p=0.001, p=0.004 respectively. Body

  18. Chronic homocysteine exposure causes changes in the intrinsic electrophysiological properties of cultured hippocampal neurons.

    Science.gov (United States)

    Schaub, Christina; Uebachs, Mischa; Beck, Heinz; Linnebank, Michael

    2013-04-01

    Homocystinuria is an inborn error of metabolism characterized by plasma homocysteine levels up to 500 μM, premature vascular events and mental retardation. Mild elevations of homocysteine plasma levels up to 25 μM, which are common in the general population, are associated with vascular disease, cognitive impairment and neurodegeneration. Several mechanisms of homocysteine neurotoxicity have been investigated. However, information on putative effects of hyperhomocysteinemia on the electrophysiology of neurons is limited. To screen for such effects, we examined primary cultures of mouse hippocampal neurons with the whole-cell patch-clamp technique. Homocysteine was applied intracellularly (100 μM), or cell cultures were incubated with 100 μM homocysteine for 24 h. Membrane voltage was measured in current-clamp mode, and action potential firing was induced with short and prolonged current injections. Single action potentials induced by short current injections (5 ms) were not altered by acute application or incubation of homocysteine. When we elicited trains of action potentials with prolonged current injections (200 ms), a broadening of action potentials during repetitive firing was observed in control neurons. This spike broadening was unaltered by acute application of homocysteine. However, it was significantly diminished when incubation with homocysteine was extended to 24 h prior to recording. Furthermore, the number of action potentials elicited by low current injections was reduced after long-term incubation with homocysteine, but not by the acute application. After 24 h of homocysteine incubation, the input resistance was reduced which might have contributed to the observed alterations in membrane excitability. We conclude that homocysteine exposure causes changes in the intrinsic electrophysiological properties of cultured hippocampal neurons as a mechanism of neurological symptoms of hyperhomocysteinemia.

  19. Homocysteine levels in vegetarians versus omnivores.

    Science.gov (United States)

    Krajcovicová-Kudlácková, M; Blazícek, P; Kopcová, J; Béderová, A; Babinská, K

    2000-01-01

    Vitamin B(12), folate, and vitamin B(6) are the main determinants of homocysteinemia. The vegan diet provides no vitamin B(12), but also less strict forms of alternative nutrition may suffer from a deficit of this vitamin. The plasma homocysteine level was measured in alternative nutrition groups of adults (lacto- and lactoovovegetarians, n = 62; vegans, n = 32) and compared with the levels in a group consuming traditional diet (n = 59), omnivores). In the group of vegetarians the average homocysteine level is 13.18 vs. 10.19 micromol/l in omnivores; the frequency of hyperhomocysteinemia is 29 vs. 5% in omnivores. In the group of vegans the average homocysteine value is 15.79 micromol/l (53% of the individual values exceeded 15 micromol/l). Omnivores consume the recommended amount of methionine; however, in individuals consuming an alternative diet, the intake of methionine is deficient (assessed by food frequency questionnaire; lower content of methionine in plant proteins). Under conditions of lower methionine availability the remethylation pathway prevails; therefore, vitamin B(12) and folate were evaluated in relation to the homocysteine level. The serum vitamin B(12) levels are significantly lower in the alternative nutrition groups (214.8 pmol/l in vegetarians, 140.1 pmol/l in vegans vs. 344.7 pmol/l in omnivores); a deficit (vegetarians and in 78% of the vegans vs. 0% in omnivores. The serum folate levels were within the range of reference values in all groups; however, they were significantly lower in omnivores. The results show that the mild hyperhomocysteinemia in alternative nutrition is a consequence of vitamin B(12) deficiency. Copyright 2000 S. Karger AG, Basel

  20. Level of Pregnancy-associated Plasma Protein-A,Cystatin C and Homocysteine in Pregnancy Induced Hypertension Patients and the Clinical Value%Medical Recapitulate

    Institute of Scientific and Technical Information of China (English)

    杨慧丽; 张秀欣

    2016-01-01

    目的:研究妊娠相关蛋白A( PAPP-A)、胱抑素C( CysC)、血同型半胱氨酸( Hcy)在妊娠期高血压疾病患者体内水平和其临床价值。方法选择2013年9月至2014年10月青岛市胶州中心医院收治的80例妊娠期高血压疾病患者作为研究组,另选30例正常妊娠妇女作为对照组。对两组收缩压、舒张压、心率等常规指标进行对比分析。依照观察组疾病类型分为妊娠期高血压、子痫、轻度先兆子痫、重度先兆子痫4个亚组,比较各组PAPP-A、CysC、Hcy水平差异。结果研究组患者收缩压、舒张压、心率、血尿酸均显著高于对照组[(166±20) mmHg(1 mmHg =0.133 kPa)比(131±15) mmHg、(108±20) mmHg 比(85±10) mmHg、(101±8)次/min 比(85±6)次/min、(383±63)μmol/L 比(310±52)μmol/L],白蛋白水平显著低于对照组[(30±7) g/L比(42±4) g/L],差异有统计学意义(P<0.05)。研究组PAPP-A、CysC、Hcy水平显著高于对照组[(37.0±7.7)μmol/L比(28.7±5.5)μmol/L、(1.5±0.4) mg/L 比(0.8±0.3) mg/L、(24.7±1.7)μmol/L 比(9.9±0.8)μmol/L],差异有统计学意义(P<0.05)。妊娠期高血压组、轻度先兆子痫组、重度先兆子痫组、子痫组患者PAPP-A、CysC、Hcy水平均依次升高,4组比较差异有统计学意义( P<0.05)。结论妊娠期高血压疾病患者血清中PAPP-A、CysC、Hcy水平均显著高于正常健康妊娠孕妇,病情越严重,其水平越高,对于妊娠期高血压疾病的临床诊治具有重要指导意义。%Objective To study the level of pregnancy associated protein A ( PAPP-A) ,serum cystatin C (Cys C),plasma homocysteine (Hcy) in patients with pregnancy induced hypertension and the clinical value. Methods Chosen from Sep.2013 to Oct.2014 in Qingdao Jiaozhou Central Hospital 80 cases of pregnancy

  1. Distribution of Serum Total Homocysteine and Its Association with Diabetes and Cardiovascular Risk Factors of the Insulin Resistance Syndrome in Mexican American Men: The Third National Health and Nutrition Examination Survey

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    Gillum Richard

    2003-08-01

    Full Text Available Abstract Background Few data have been published on the association of variables of the insulin resistance syndrome and serum total homocysteine (tHcy, a putative risk factor for cardiovascular morbidity, in representative samples of total populations or in Hispanic Americans. Methods To describe the distributions of serum tHcy concentration and variables associated with insulin resistance in Mexican American men and to assess their association, data from a cross-sectional survey of a large national sample, the Third National Health and Nutrition Examination Survey were analyzed. Analyses were restricted to Mexican American men aged 40–74 years with data on glycated hemoglobin (%, body mass index (BMI, body fat distribution, HDL cholesterol, fasting serum insulin, serum triglycerides and serum tHcy concentrations. Results Cumulative distributions of serum tHcy shifted to the right with increasing age. Log serum tHcy was not associated with prevalence of diagnosed diabetes mellitus or glycated hemoglobin percent or other risk factors other than age. Log serum tHcy concentration showed borderline significant (p = 0.049 positive association with fasting serum insulin concentration independent of age and BMI, only in men aged 60–74. Conclusion No consistent association of tHcy with diabetes prevalence or variables of the insulin resistance syndrome were found in Mexican American men aged 40–74 years. Further research is needed on the associations of serum tHcy concentration with insulin resistance and other components of the insulin resistance syndrome in persons of varying ethnicity.

  2. Kinetics of homocysteine metabolism after moderate alcohol consumption

    NARCIS (Netherlands)

    Beulens, J.W.J.; Sierksma, A.; Schaafsma, G.; Kok, F.J.; Struys, E.A.; Jakobs, C.; Hendriks, H.F.J.

    2005-01-01

    Background: Moderate alcohol consumption is associated with a decreased risk of cardiovascular disease. Because plasma homocysteine (tHcy) is considered an independent risk factor for cardiovascular disease and associated with alcohol consumption, the authors investigated the effect of moderate alco

  3. Maternal and umbilical homocysteine in preeclampsia

    OpenAIRE

    Vuković Bobić, Mirna; Čerkez Habek, Jasna; Habek, Dubravko

    2016-01-01

    Background and purpose: Were to assess the association between homocysteine levels and development of preeclampsia, to determine homocysteine levels in fetal circulation, to differentiate homocysteine levels in mild and severe preeclampsia and to compare homocysteine levels in pregnant women with preeclampsia with homocysteine levels measured in the same group of women six months after delivery. Material and methods: The study included 55 pregnant women with mild or severe preeclampsia (h...

  4. A Comparison of Plasma Homocysteine Levels among Patients with Various Types of Dementia%各型痴呆患者血浆同型半胱氨酸水平对比分析

    Institute of Scientific and Technical Information of China (English)

    王鲁妮; 彭艳; 刘泽; 邹海强

    2013-01-01

    目的:探讨各型老年期痴呆患者血浆同型半胱氨酸( Hcy )水平变化特点。方法采用放射免疫比浊法测定阿尔茨海默病(AD)42例、血管性痴呆(VD)40例、帕金森痴呆(PDD)33例及对照组50例,空腹血浆Hcy及血管紧张素转化酶水平。结果 PDD组血浆Hcy水平低于VD组、AD组、对照组( P<0.05),而血管紧张素转化酶水平高于VD组、AD组、对照组( P<0.05);VD组、AD组、对照组的Hcy水平及血管紧张素转化酶水平比较差异均无统计学意义( P>0.05)。结论可能血浆Hcy水平与稳定期老年性痴呆无关联。%Objective To investigate the changes of plasma homocysteine ( Hcy ) levels among patients with various types of dementia .Methods Fasting plasma Hcy and angiotensin converting enzyme levels were respectively measured in 42 patients with Alzheimer′s disease(AD),40 patients with vascular dementia (VD),33 patients with Parkinson′s dementia ( PDD ) and 50 cases of the control with immunoturbidimetry .Results The levels of plasma Hcy in PDD group were significantly lower than those in VD group ,AD group and the control(P0.05).Conclusion The levels of plasma Hcy might not be associat-ed with senile dementia during the stable period .

  5. Plasma protein oxidation and total antioxidant power in premenstrual syndrome

    Institute of Scientific and Technical Information of China (English)

    Eans Tara Tuladhar; Anjali Rao

    2010-01-01

    Objective:To explore whether oxidative stress has any role inpremenstrual syndrome (PMS). Methods: Female volunteers suffering from PMS , in the age group of 20-24 years were compared to their asymptomatic normomennorhoeic counterparts in follicular phase and late luteal phase for ferric reducing antioxidant power of plasma(FRAP), plasma protein thiols(PPT) and protein carbonyls(PPC) levels.Results:There was no significant change in FRAP and PPC levels in controls andPMS groups but PPT decreased significantly in luteal phase ofPMS (P< 0.05) when compared to follicular phase.Conclusions:Estrogen and progesterone, might be responsible for a healthy antioxidant profile inPMS. However, a marked decrease inPPT in luteal phase of PMS group may be due to pro-oxidant nature of estrogen-active in this phase of PMS leading to consumption of the sacrificial antioxidant-protein thiol.

  6. Homocysteine in relation to cognitive performance in pathological and non-pathological conditions.

    NARCIS (Netherlands)

    Teunissen, C.E.; Boxtel, M.P. van; Jolles, J.; Vente, J. de; Vreeling, F.; Verhey, F.R.J.; Polman, C.H.; Dijkstra, C.D.; Blom, H.J.

    2005-01-01

    Elevated serum homocysteine has been associated with increased risk of Alzheimer's disease. Furthermore, elevated homocysteine levels are related to cognitive dysfunction in the elderly. The aim of the present study was to explore the disease specificity of the relation between serum total homocyste

  7. Determination of Plasma Homocysteine in Gestational Diabetes Mellitus and Its Clinical Significance%妊娠期糖尿病患者血清同型半胱氨酸检测及临床意义

    Institute of Scientific and Technical Information of China (English)

    李茂宇; 贺晶

    2013-01-01

    [目的]研究妊娠期糖尿病患者血清同型半胱氨酸(HCY)水平及临床意义.[方法]以2012年5月至2012年8月期间,湖州市妇幼保健院住院分娩的153例妊娠期糖尿病妇女为观察组,并按血糖控制程度分为A1组和A2组,同时选取同期单胎孕晚期妇女90例为对照组,研究其血清同型半胱氨酸水平以及同型半胱氨酸和妊娠结局的相关性.[结果]结果显示,A2组血清HCY水平(11.98±4.05)较A1组(8.88±2.63)及对照组(8.86±2.48)明显升高(P<0.01).单因素方差分析显示年龄、体质量、产次、孕周、血清HCY、空腹血糖水平等因素影响母婴不良结局的发生,logistic回归分析提示孕周和血清HCY水平是影响妊娠结局发生的独立因素.[结论]血清HCY水平可能与妊娠期糖尿病的发展程度和妊娠结局密切相关,对妊娠期糖尿病妇女监测血HCY比监测单次血糖可能更有助于判断不良结局的发生风险.%[Objective] To investigate clinical significance of gestational diabetes mellitus (GDM) by detecting the level of homocysteine.[Methods] A total of 153 cases of GDM gravida were selected as observation group in Huzhou Women's and Children's Hospital from May 2012 to August 2012,and they were divided into group A1 and A2 according to the blood glucose level.90 cases healthy pregnant women were selected as control group during the same period.Serum homocystein concentration was studied of all the cases,and the correlation between homocysteine and pregnancy outcomes was analyzed.[Results] The serum HCY level in group A2 (11.98 ± 4.05) was significantly higher than that in group A1(8.88 ± 2.63) and control group (8.86 ± 2.48) (P< 0.01).Univariate analysis showed that age,weight,parity,gestational age,HCY,fasting blood glucose affect the incidence of maternal and infant adverse outcomes of pregnancy.Logistic regression analysis revealed that the gestational age and HCY are independent factors influence the outcome of

  8. PLATELET RICH PLASMA (PRP APPLICATION IN TOTAL KNEE ARTHROPLASTY (TKA

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    Pencho Kosev

    2015-07-01

    Full Text Available PURPOSE: To find out the PRP application effects in TKA on pain syndrome, wound healing, postoperative blood loss, range of motion and the knee circumference (centimetry. MATERIAL AND METHOD: The preparation of the platelet-rich plasma is based on our treatment algorithm. 20 patients have been subject to TKA within the period from October 2012 to November 2014 and underwent TKA, as platelet rich plasma was used intraoperatively. The average patient age is 72,3; 9 male and 11 female patients. Control group consisted of 17 patients, who underwent surgery in the same period but no platelet rich plasma was used during surgery. Average patient age 73,1; 8 male and 9 female patients. RESULTS: The following results have been reported for the PRP group of patients: the average amount of blood in the aspiration drainage tube in 24 hours - 285 ml.; postoperative pain on the 1st postoperative day was - 7 p., on the 5th day - 5 p., on the 10th day - 2 p., average circumference (centimetry of the knee between the 1st and the 10th postoperative day decreased on average by 1,5-2 cm., range of motion – reported average degrees per patient on the 1st postoperative day in sagittal plane: 0-10-20 degrees; on the 10th postoperative day: 0-0-55 degrees, surgical wounds of all patients healed primarily without any complications. No PRP group: average amount of blood in the aspiration drainage in 24 hours – 300 pl., postoperative pain on the 1st, 5th , and 10th postoperative day - 8 p., on the 5th day - 6 p., on the 10th day - 3 p., average knee circumference (centimetry between 1 and 10 postoperative day has decreased by 1 cm on average, range of motion - reported average degrees per patient on the 1st postoperative day in sagittal plane 0-5-20 degrees, on the 10th: 0-0-50 degrees, surgical wounds healed primarily without any complications in 10 patients, but in 7 patients we observed superficial wound edge skin necrosis. CONCLUSION: Our results unequivocally

  9. Effect of homocysteine-lowering nutrients on blood lipids: results from four randomised, placebo-controlled studies in healthy humans.

    Directory of Open Access Journals (Sweden)

    Margreet R Olthof

    2005-05-01

    Full Text Available BACKGROUND: Betaine (trimethylglycine lowers plasma homocysteine, a possible risk factor for cardiovascular disease. However, studies in renal patients and in obese individuals who are on a weight-loss diet suggest that betaine supplementation raises blood cholesterol; data in healthy individuals are lacking. Such an effect on cholesterol would counteract any favourable effect on homocysteine. We therefore investigated the effect of betaine, of its precursor choline in the form of phosphatidylcholine, and of the classical homocysteine-lowering vitamin folic acid on blood lipid concentrations in healthy humans. METHODS AND FINDINGS: We measured blood lipids in four placebo-controlled, randomised intervention studies that examined the effect of betaine (three studies, n = 151, folic acid (two studies, n = 75, and phosphatidylcholine (one study, n = 26 on plasma homocysteine concentrations. We combined blood lipid data from the individual studies and calculated a weighted mean change in blood lipid concentrations relative to placebo. Betaine supplementation (6 g/d for 6 wk increased blood LDL cholesterol concentrations by 0.36 mmol/l (95% confidence interval: 0.25-0.46, and triacylglycerol concentrations by 0.14 mmol/l (0.04-0.23 relative to placebo. The ratio of total to HDL cholesterol increased by 0.23 (0.14-0.32. Concentrations of HDL cholesterol were not affected. Doses of betaine lower than 6 g/d also raised LDL cholesterol, but these changes were not statistically significant. Further, the effect of betaine on LDL cholesterol was already evident after 2 wk of intervention. Phosphatidylcholine supplementation (providing approximately 2.6 g/d of choline for 2 wk increased triacylglycerol concentrations by 0.14 mmol/l (0.06-0.21, but did not affect cholesterol concentrations. Folic acid supplementation (0.8 mg/d had no effect on lipid concentrations. CONCLUSIONS: Betaine supplementation increased blood LDL cholesterol and triacylglycerol

  10. Effect of sulfite treatment on total antioxidant capacity, total oxidant status, lipid hydroperoxide, and total free sulfydryl groups contents in normal and sulfite oxidase-deficient rat plasma.

    Science.gov (United States)

    Herken, Emine Nur; Kocamaz, Erdogan; Erel, Ozcan; Celik, Hakim; Kucukatay, Vural

    2009-08-01

    Sulfites, which are commonly used as preservatives, are continuously formed in the body during the metabolism of sulfur-containing amino acids. Sulfite oxidase (SOX) is an essential enzyme in the pathway of the oxidative degradation of sulfite to sulfate protecting cells from sulfite toxicity. This article investigated the effect of sulfite on total antioxidant capacity (TAC), total oxidant status, lipid hydroperoxide (LOOH), and total free sulfydryl groups (-SH) levels in normal and SOX-deficient male albino rat plasma. For this purpose, rats were divided into four groups: control, sulfite-treated, SOX-deficient, and sulfite-treated SOX-deficient groups. SOX deficiency was established by feeding rats a low molybdenum diet and adding to their drinking water 200 ppm tungsten. Sulfite (70 mg/kg) was administered to the animals via their drinking water. SOX deficiency together with sulfite treatment caused a significant increase in the plasma LOOH and total oxidant status levels. -SH content of rat plasma significantly decreased by both sulfite treatment and SOX deficiency compared to the control. There was also a significant decrease in plasma TAC level by sulfite treatment. In conclusion, sulfite treatment affects the antioxidant/oxidant balance of the plasma cells of the rats toward oxidants in SOX-deficient groups.

  11. The role of Homocysteine as a predictor for coronary heart disease

    Directory of Open Access Journals (Sweden)

    Schramm, Susanne

    2007-11-01

    Full Text Available Background and objective: There is an ongoing debate on the role of the cytotoxic aminoacid homocysteine as a causal risk factor for the development of coronary heart disease. Results from multiple case control-studies demonstrate, that there is a strong association between high plasma levels of homoysteine and prevalent coronary heart disease, independent of other classic risk factors. Furthermore, results from interventional studies point out that elevated plasma levels of homocysteine may effectively be lowered by the intake of folic acid and B vitamins. In order to use this information for the construction of a new preventive strategy against coronary heart disease, more information is needed: first, whether homocysteine actually is a causal risk factor with relevant predictive properties and, second, whether by lowering elevated homocysteine plasma concentrations cardiac morbidity can be reduced. Currently in Germany the determination of homocysteine plasma levels is reimbursed for by statutory health insurance in patients with manifest coronary heart disease and in patients at high risk for coronary heart disease but not for screening purposes in asymptomatic low risk populations.Against this background the following assessment sets out to answer four questions: 1. Is an elevated homocysteine plasma concentration a strong, consistent and independent (of other classic risk factors predictor for coronary heart disease? 2. Does a therapeutic lowering of elevated homoysteine plasma levels reduce the risk of developing coronary events? 3. What is the cost-effectiveness relationship of homocysteine testing for preventive purposes? 4. Are there morally, socially or legally relevant aspects that should be considered when implementing a preventive strategy as outlined above? Methods: In order to answer the first question, a systematic overview of prospective studies and metaanalyses of prospective studies is undertaken. Studies are included that

  12. Serum Homocysteine level in patients with Multiple Sclerosis

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    F Ashtari

    2005-09-01

    Full Text Available Background: The etiology of multiple sclerosis (MS, a chronic demyelinative disease-is unknown. The damage of blood–brain barrier (BBB vasculature is a characteristic of MS and Homocystein (Hcy can damage BBB, then increase in total Hcy may be important in MS pathogenesis. The aim of this study was to compare the serum level of total Hcy in MS patients with control group. Methods: In a case control study, serum level of total Hcy measured in 35 MS patient and compared with 30 healthy matched controls. All patients had definitive MS according to Poser criteria, without history of myocardial infarction, stroke, neuropathy, transient ischemic attack, homocystinuria or renal failure. Results: The serum concentration of total homocystein was significantly higher in multiple sclerosis patients than healthy controls. The mean total Hcy level was 17.92± 6.9 mmol/lit in cases and 14.6±2.92 mmol/lit in controls (P=0.013. Conclusion: Serum total Homocystein may have a role in MS pathogenesis and reduction of it should be studied moreover. Key words: Multiple Sclerosis, Homocystein, Serum level

  13. Central cardiovascular actions of L-homocysteine microinjected into ventrolateral medullary autonomic areas of the rat.

    Science.gov (United States)

    Takemoto, Yumi

    2016-09-01

    Elevated L-homocysteine concentrations in the plasma and cerebrospinal fluid are related to cardiovascular and neuronal diseases, and could contribute to disease development. However, the central cardiovascular actions of L-homocysteine in two important autonomic regulating areas remain unknown: the rostral ventrolateral medulla (RVLM), including pre-sympathetic neurons, and the caudal ventrolateral medulla (CVLM), including interneurons projecting to pre-sympathetic neurons in the RVLM. Therefore, the aim of the current study was to examine the influence of L-homocysteine microinjected into the RVLM and CVLM areas on changes in arterial blood pressure (ABP) and heart rate (HR) of anesthetized rats, as well as the influence of ionotropic excitatory amino acid (iEAA) receptors on the central actions of L-homocysteine. L-Homocysteine solutions were microinjected into the RVLM and CVLM, which were defined according to pressor and depressor responses to L-glutamate microinjections, respectively. ABP and HR increased in the RVLM and decreased in the CVLM after microinjection with L-homocysteine, similar to L-glutamate, in a dose-dependent manner, suggesting mediation of EAA receptors. Prior microinjection of the N-methyl-D-aspartate (NMDA) iEAA receptor antagonist MK801, but not the non-NMDA receptor antagonist CNQX, abolished the observed responses to L-homocysteine in both the RVLM and CVLM. These results indicate the central cardiovascular actions of L-homocysteine via MK801-sensitive receptors of the medullary autonomic neurons in the rat RVLM and CVLM. It remains unknown if the central cardiovascular actions are related to cardiovascular diseases after endogenously and locally augmented L-homocysteine production by disordered metabolism. Further studies on functional significance of L-homocysteine may provide some clue to understand its toxic mechanism.

  14. Homocysteine, Liver Function Derangement and Brain Atrophy in Alcoholics.

    Science.gov (United States)

    Fernández-Rodríguez, Camino; González-Reimers, Emilio; Quintero-Platt, Geraldine; de la Vega-Prieto, María José; Pérez-Hernández, Onán; Martín-González, Candelaria; Espelosín-Ortega, Elisa; Romero-Acevedo, Lucía; Santolaria-Fernández, Francisco

    2016-11-01

    Hyperhomocysteinemia may be involved in the development of brain atrophy in alcoholics. Its pathogenesis is multifactorial. In the present study, we analyse the relationship between homocysteine levels and brain atrophy, and the relative weight of co-existing factors such as liver function impairment, the amount of ethanol consumed, serum vitamin B12, B6, and folic acid levels on homocysteine levels and brain alterations in alcoholic patients. We included 59 patients admitted to this hospital for major withdrawal symptoms and 24 controls. The mini-mental state examination test and a brain computed tomography (CT) scan were performed and several indices were calculated. Serum levels of homocysteine, folic acid, vitamin B6 and vitamin B12 were determined. Liver function was assessed by Child-Pugh score. The daily consumption of ethanol in grams per day and years of addiction were recorded. A total of 83.6% and 80% of the patients showed cerebellar or frontal atrophy, respectively. Patients showed altered values of brain indices, higher levels of homocysteine and vitamin B12, but lower levels of folic acid, compared with controls. Homocysteine, B12 and liver function variables showed significant correlations with brain CT indices. Multivariate analyses disclosed that Pugh's score, albumin and bilirubin were independently related to cerebellar atrophy, frontal atrophy, cella index or ventricular index. Serum vitamin B12 was the only factor independently related to Evans index. It was also related to cella index, but after bilirubin. Homocysteine levels were independently related to ventricular index, but after bilirubin. Vitamin B12 and homocysteine levels are higher among alcoholics. Liver function derangement, vitamin B12 and homocysteine are all independently related to brain atrophy, although not to cognitive alterations. Hyperhomocysteinemia has been described in alcoholics and may be related to brain atrophy, a reversible condition with an obscure pathogenesis

  15. 急性脑梗死患者血浆同型半胱氨酸水平高血压与脑微出血的相关性分析%Correlation between plasma homocysteine level hypertension and cerebral microbleeds in patients with acute cerebral infarction

    Institute of Scientific and Technical Information of China (English)

    曹昌权; 刘维洲

    2015-01-01

    Objective To investigate the correlation between plasma homocysteine(Hcy) level, hypertension and cerebral microb-leeds(CMBs) in patients with acute cerebral infarction. Methods The clinical and imaging data of 74 patients with acute cerebral infarction who had been admitted in this hospital from January 2011 to January 2012 were analyzed retrospectively. According to the existence of cere-bral microbleeds, the patients were divided into two groups, namely the CMB group and the non-CMB group. Blood pressure, blood lipids, blood glucose, and plasma homocysteine were recorded in the two groups of patients, and the risk factors for cerebral microbleeds in acute cerebral infarction were explored. Results A total of 74 patients with acute cerebral infarction were enrolled, 23 of them were females and 51 were males (mean age 66. 22 ± 8. 96 years). Multivariate logistic regression analysis showed that cerebral microbleeds was associated closely with hypertension(OR=4. 67,95% CI:1. 2~17. 65,P=0. 02), but plasma Hcy level was not related to CMBs(OR=1. 01,95%CI:0. 97~1. 06,P=0. 38). Conclusion The level of elevated plasma Hcy in patients with acute cerebral infarction is unrelated to CMBs. Hypertension is significantly associated with CMBs, which might be the independent risk factor for CMBs.%目的:探讨急性脑梗死患者血浆同型半胱氨酸( Hcy)水平、高血压与脑微出血( CMB)的关系。方法选择铜陵市人民医院神经内科2011年1月至2012年1月收治的急性脑梗死患者74例,对其临床及影像学资料进行回顾性分析。根据是否存在CMB分为CMB组和无CMB组。记录两组患者血压、血脂、血糖、血浆Hcy水平等情况,并探讨CMB的危险因素。结果74例急性脑梗死患者中,男性51例,女性23例,平均(66.22±8.96)岁。 logistic回归分析显示,CMB的发生与高血压密切相关(OR=4.67,95% CI ∶1.23~17.65,P=0.02),与血浆Hcy水平无明显相关(OR=1.01,95% CI ∶0.97~1.06,P

  16. Increased plasma carnitine in trauma patients given lipid-supplemented total parenteral nutrition.

    Science.gov (United States)

    Davis, A T; Albrecht, R M; Scholten, D J; Morgan, R E

    1988-12-01

    The purpose of this study was to determine the effects of altering the fuel substrate mix of total parenteral nutrition (TPN) on plasma and urinary carnitine in trauma patients. TPN solutions were either 100% carbohydrate (CHO) based or lipid based (70% CHO, 30% lipid). There were statistically significant (p less than 0.05) increases in plasma levels of free carnitine, short-chain acyl carnitine, and total carnitine in trauma patients receiving lipid-based TPN. No significant differences in urinary carnitine excretion were noted between groups. We conclude that the use of lipids in the TPN of trauma patients leads to an alteration in plasma carnitine metabolism.

  17. Folate and homocysteine levels in pregnancy.

    Science.gov (United States)

    Megahed, M A; Taher, I M

    2004-01-01

    This study aims to determine serum folate and plasma homocysteine levels in healthy pregnant women following a live birth and compare them with healthy non-pregnant women. Fifty healthy gravid multiparous women are included in the study and 25 normal non-pregnant female subjects act as controls (group I). The pregnant women are divided into two groups according to interpregnancy interval: group II (six months or less); group III (18-24 months). Venous blood samples are analysed for red blood cell folate and homocysteine, vitamin B12, serum folate and albumin, and serum aminotransferases (ALT and AST). There was a significant decrease in red cell folate and serum folate in group II compared to the control group (Phomocysteine and serum albumin showed significant decreases in both groups II and III compared to the control group. (Phomocysteine and serum albumin in the three studied groups. (r=0.42, Phomocysteine in the three studied groups. (r=-0.48, Ppregnant females with short interpregnancy intervals are more likely to develop folate deficiency. Educational strategies are required to increase folate awareness among women to promote the benefits of folic acid supplementation. Mandatory folate fortification of foods should be defined and monitored.

  18. Molecular mechanisms of homocysteine toxicity.

    Science.gov (United States)

    Boldyrev, A A

    2009-06-01

    Hyperhomocysteinemia is a risk factor for a number of cardiovascular and neurodegenerative processes as well as a complicating factor in normal pregnancy. Toxic effects of homocysteine and the product of its spontaneous oxidation, homocysteic acid, are based on their ability to activate NMDA receptors, increasing intracellular levels of ionized calcium and reactive oxygen species. Even a short-term exposure of cells to homocysteic acid at concentrations characteristic of hyperhomocysteinemia induces their apoptotic transformation. The discovery of NMDA receptors both in neuronal tissue and in several other tissues and organs (including immunocompetent cells) makes them a target for toxic action of homocysteine. The neuropeptide carnosine was found to protect the organism from homocysteine toxicity. Treatment of pregnant rats with carnosine under conditions of alimentary hyperhomocysteinemia increases viability and functional activity of their progeny.

  19. X-ray plasma diagnostics for totally and partially photoionized plasmas such as Warm Absorber in AGN

    CERN Document Server

    Porquet, D; Porquet, Delphine; Dubau, Jacques

    1999-01-01

    Thanks to the new generation of X-ray satellites such as Chandra and XMM, high resolution and high sensitivity spectra are available. In particular, for the first time, the three most intense lines (resonance, intercombination and forbidden) of low charged (low Z) He-like ions are splitted for non solar plasmas. We present density, ionizing process and temperature diagnostics, for totally and partially photoionized plasmas, based on ratios of these three lines. These powerful plasma diagnostics could be used for hot astrophysical plasmas such as AGN, starburst galaxies, X-ray binaries, etc. In particular, they could be applied to Warm Absorber often seen in Active Galactic Nuclei (Porquet & Dubau 2000), which is an important key tool to understand central region of different types of AGN (Seyfert 1 and 2, high and low redshift quasars).

  20. Homocysteine increases the risk associated with hyperlipidaemia.

    LENUS (Irish Health Repository)

    Daly, Caroline

    2009-04-01

    The European Concerted Action Project \\'Homocysteine and Vascular Disease\\' showed that an elevated homocysteine is associated with a substantially increased risk of cardiovascular disease, and particularly when combined with other factors such as smoking, hypertension and hypercholesterolaemia. The purpose of this study was to examine the potential interactions between homocysteine and individual lipid subfractions. In addition, it was hypothesized that HDL cholesterol may protect against hyperhomocysteinaemia because HDL cholesterol is associated with the enzyme paroxonase, which reduces oxidization of homocysteine to the harmful metabolite, homocysteine thiolactonase.

  1. Homocystein og livsstil. Resultater fra Homocysteinundersøkelsen i Hordaland 1992-1993

    Directory of Open Access Journals (Sweden)

    Ottar Nygård

    2009-10-01

    Full Text Available  SAMMENDRAGTotal homocystein (tHcy er etablert som risikofaktor for hjerte- og karsykdom. Vi har studert determinanterav plasma tHcy i et utvalg av den voksne norske befolkning basert på undersøkelse utført av Statenshelseundersøkelser i samarbeid med Universitetet i Bergen i 1992-1993. Data ble innhentet ved kliniskundersøkelse, utfylling av tre spørreskjema og ved blodtester. I alt 18 043 personer i alderen 40-67 år møttetil undersøkelse og fikk målt plasma tHcy. Plasma folat, plasma kobalamin og 677C →T mutasjonen i genetfor metylentetrahydrofolatreduktase (MTHFR er bestemt i et underutvalg på 329 personer og på personermed svært høye tHcy verdier ( ≥ 40 μmol/L. Resultatene fra Homocysteinundersøkelsen i Hordaland harvist at kjønn, alder, folatinntak, røykevaner og kaffeforbruk er de sterkeste determinanter for plasma tHcynivå, mens kobalamininntak, fysisk aktivitet, blodtrykk og kolesterolnivå er mindre sterke determinanter.Bruk av multivitaminer eller B-vitaminer er forbundet med spesielt lave tHcy nivåer. Personer med tHcy ≥40 μmol/L er karakterisert ved høy forekomst (73% av homozygositet for 677C →T mutasjonen i MTHFRgenet og lavt folatnivå. Vi konkluderer derfor med at livsstil og etablerte risikofaktorer for hjerte- ogkarsykdom er vesentlige for nivået av plasma tHcy i den generelle voksne norske befolkning.Nygård O, Refsum H, Ueland PM, Tverdal A, Vollset SE. Homocysteine and lifestyle. The HordalandHomocysteine Study. Nor J Epidemiol 1997; 7 (2: 221-224.ENGLISH SUMMARYTotal homocysteine (tHcy concentration is an established cardiovascular risk factor. We have studieddeterminants of plasma tHcy among 18 043 subjects aged 40-67 years from Hordaland county in WesternNorway who participated in a health screening programme in 1992-1993. Gender, age, folate intake,smoking habits and coffee consumption are the strongest determinants of plasma tHcy level, whereascobalamin intake, physical activity

  2. Evaluation of the refractometric method for the determination of total protein in avian plasma or serum.

    Science.gov (United States)

    Lumeij, J T; de Bruijne, J J

    1985-07-01

    Serum total protein concentrations in pigeon blood determined with the biuret method (TPB-se) were compared with total protein concentrations in plasma (TPR-pl) and serum (TPR-se) obtained by estimation from refractive index. The refractometric method consistently yielded higher values (Prefractometric method for determination of TP in pigeon blood is not recommended.

  3. Relation between plasma homocysteine and cognitive impairment of patients with alcohol dependence%酒依赖患者血浆Hcy水平与认知功能障碍的关系

    Institute of Scientific and Technical Information of China (English)

    谭秀丽; 胡建

    2015-01-01

    Objective To discuss the change of plasma homocysteine (Hcy) levels in alcohol de‐pendence patients and the relationship between Hcy levels and cognitive impairment .Methods The plas‐ma Hcy levels in alcohol dependence group and control group were examined with enzyme-linked immu‐no -sorbent assay(ELSIA) .The cognitive functions were assessed by using the modified Wisconsin Card Sorting Test (M -WCST) ,visual reproduction and the logical memory test .Results The Hcy levels in alcohol dependence group 7 .200(6 .595 ,8 .940)μmol/l were significantly higher than those in the control group 5 .905(5 .063 ,6 .630)μmol/l (P < 0 .01) .The alcohol dependence group had significantly poor performance in the correct responses and numbers of categories ,perseverative errors and non-persever‐ative errors of M -WCST compared with control group (P< 0 .05);Both of the scores of the visual re‐production and the logical memory test had significantly lower in the alcohol dependence group than those in the control group (P < 0 .01) .The Hcy levels negatively correlated with the numbers of correct re‐sponses of M -WCST in the alcohol dependence group (r = -0 .59 383 ,P < 0 .01) ,but the positively correlated with the numbers of total errors ,perseverative errors and non -perseverative errors (r =0.590 59 ,0 .728 51 ,0 .354 68 ,respectively ;P < 0 .01) .Both of the scores of the visual reproduction (r =-0 .437 24 ,P < 0 .05 ,) and the logical memory test (r= -0 .409 87 ,P< 0 .05) had significantly nega‐tive correlation with the Hcy levels in alcohod dependence group .Conclusions The Hcy levels were high‐er in alcohol dependence patients compared to the healthy controls .The alcohol dependence patients dem‐onstrate impairments in cognition .The Hcy level may be a indicator to assess the degree of the cognitive impairments of the alcohol dependence patients .%目的:探讨酒依赖患者血浆同型半胱氨酸(Hcy)水平与健康人群的区别及其与酒依赖

  4. 不同剂量叶酸对H型高血压血浆同型半胱氨酸水平的影响%Effect of different dose of folic acid on the plasma homocysteine in patients with hyperhomocysteinima-related hypertention

    Institute of Scientific and Technical Information of China (English)

    余泳; 王晓明; 陈月婵

    2013-01-01

    Objective To observe the effect of different dose of folic acid on the plasma homocysteine in patients with hyperhomocysteinima-related hypertention.Methods One hundred and fifty patients with hyperhomocysteinima-related hypertention were randomly divided into 3 groups,50 cases in each group.Group A was given folic 5 mg/d; group B was given folic acid 10 mg/d; group C was given folic acid 15 mg/d; The plasma homocysteine(Hcy) concentration was detected before and after 4 weeks treatment.Results After 4 weeks treatment,the levels of plasma Hcy all significantly decreased in 3 groups(P all < 0.001),compared with the level of prior treatment.But there was no difference among the 3 groups after the treatment (P all > 0.05).Conclusions The plasma homocysteine in patients with hyperhomocysteinima-related hypertention was decreased after the treatment of folic acid.The degree of the homocysteine decreased has no relationship with dose of the medicine.%目的 观察不同剂量叶酸对H型高血压患者血浆同型半胱氨酸水平的影响.方法 选择150例H型高血压病患者随机分为A、B、C三组,每组50例.用药剂量:A组给予叶酸5 mg/d,B组给予叶酸10 mg/d,C组给予叶酸15 mg,连续给药4周,治疗前后检测血浆Hcy浓度.结果 三组治疗后血浆Hcy浓度皆明显下降,前后自身比较差异有统计学意义(P<0.001).三组间比较差异无统计学意义(P>0.05).结论 叶酸对降低H型高血压病患者血浆Hcy有明显效果,但叶酸>5 mg/d后增加叶酸剂量对于降低Hcy程度无明显效果.

  5. A comparison of the effects of cheese and butter on serum lipids, haemostatic variables and homocysteine.

    Science.gov (United States)

    Biong, Anne S; Müller, Hanne; Seljeflot, Ingebjørg; Veierød, Marit B; Pedersen, Jan I

    2004-11-01

    Milk fat contains considerable amounts of saturated fatty acids, known to increase serum cholesterol. Little is known, however, about the relative effect of different milk products on risk factors for CHD. The aim of the present study was to compare the effects of Jarlsberg cheese (a Norwegian variety of Swiss cheese) with butter on serum lipoproteins, haemostatic variables and homocysteine. A controlled dietary study was performed with twenty-two test individuals (nine men and thirteen women) aged 23-54 years. The subjects consumed three isoenergetic test diets, with equal amounts of fat and protein, and containing either cheese (CH diet), butter + calcium caseinate (BC diet) or butter + egg-white protein (BE diet). The study was a randomised cross-over study and the subjects consumed each diet for 3 weeks, with 1 week when they consumed their habitual diet in between. Fasting blood samples were drawn at baseline and at the end of each period. Serum was analysed for lipids and plasma for haemostatic variables and homocysteine. Total cholesterol was significantly lower after the CH diet than after the BC diet (-0.27 mmol/l; P=0.03), while the difference in LDL-cholesterol was found to be below significance level (-0.22 mmol/l; P=0.06). There were no significant differences in HDL-cholesterol, triacylglycerols, apo A-I, apo B or lipoprotein (a), haemostatic variables and homocysteine between the diets. The results indicate that, at equal fat content, cheese may be less cholesterol increasing than butter.

  6. Homocysteine-lowering by B vitamins slows the rate of accelerated brain atrophy in mild cognitive impairment: a randomized controlled trial.

    Directory of Open Access Journals (Sweden)

    A David Smith

    Full Text Available BACKGROUND: An increased rate of brain atrophy is often observed in older subjects, in particular those who suffer from cognitive decline. Homocysteine is a risk factor for brain atrophy, cognitive impairment and dementia. Plasma concentrations of homocysteine can be lowered by dietary administration of B vitamins. OBJECTIVE: To determine whether supplementation with B vitamins that lower levels of plasma total homocysteine can slow the rate of brain atrophy in subjects with mild cognitive impairment in a randomised controlled trial (VITACOG, ISRCTN 94410159. METHODS AND FINDINGS: Single-center, randomized, double-blind controlled trial of high-dose folic acid, vitamins B(6 and B(12 in 271 individuals (of 646 screened over 70 y old with mild cognitive impairment. A subset (187 volunteered to have cranial MRI scans at the start and finish of the study. Participants were randomly assigned to two groups of equal size, one treated with folic acid (0.8 mg/d, vitamin B(12 (0.5 mg/d and vitamin B(6 (20 mg/d, the other with placebo; treatment was for 24 months. The main outcome measure was the change in the rate of atrophy of the whole brain assessed by serial volumetric MRI scans. RESULTS: A total of 168 participants (85 in active treatment group; 83 receiving placebo completed the MRI section of the trial. The mean rate of brain atrophy per year was 0.76% [95% CI, 0.63-0.90] in the active treatment group and 1.08% [0.94-1.22] in the placebo group (P =  0.001. The treatment response was related to baseline homocysteine levels: the rate of atrophy in participants with homocysteine >13 µmol/L was 53% lower in the active treatment group (P =  0.001. A greater rate of atrophy was associated with a lower final cognitive test scores. There was no difference in serious adverse events according to treatment category. CONCLUSIONS AND SIGNIFICANCE: The accelerated rate of brain atrophy in elderly with mild cognitive impairment can be slowed by treatment

  7. 孕妇血浆同型半胱氨酸水平对胎儿的影响%Effect of plasma homocysteine level of pregnant women on fetuses

    Institute of Scientific and Technical Information of China (English)

    王春香; 王庆华; 陈光元; 王鹤

    2012-01-01

    目的:比较妊娠畸形胎儿的孕妇及正常胎儿的孕妇血浆中同型半胱氨酸(homocysteine,Hcy)水平,分析其代谢水平与妊娠畸形胎儿的关系.方法:采用病例对照研究方法,对所有研究对象采集孕妇静脉血及新生儿脐静脉血3ml,检测其血清Hcy水平,比较病例组和对照组血清Hcy的差异.研究血清Hcy水平与年龄、孕周、胎儿体重之间的关系.以对照组血清Hcy浓度的第90百分位数作为界值,划分为两个水平组,比较不同水平组胎儿先天畸形的发病风险.结果:病例组孕妇血清Hcy明显高于对照组(18.23μmol/L vs 9.52 μmol/L),差异有统计学意义(P<0.05).与年龄、孕周、胎儿体重之间无必然联系.高水平Hcy孕妇妊娠先天畸形胎儿的危险性显著增加(OR =2.4,P<0.05).结论:孕期血清Hcy高水平是研究胎儿先天畸形发生的危险因素.%Objective; To compare the plasma levels of homocysteine ( Hcy) between pregnant women giving birth to fetuses with congenital malformations and pregnant women giving birth to normal fetuses, and analyze the relationship between metabolic level of Hey and fetuses with congenital malformations. Methods : A case - control study was performed, 3 ml venous blood samples and 3 ml umbilical cord blood samples were abstracted from all the pregnant women and all the fetuses, respectively, serum Hcy levels were detected, and the difference of serum Hcy was compared between case group and control group. The relationship between serum Hcy level and age, gestational weeks, and fetal weight was researched. The 90th percentile of serum Hcy concentration in control group was selected as critical value, the cases were divided into two groups, the risk factors of fetal congenital malformations were compared between the two groups. Results: The serum Hcy level in case group was 18. 23 μmol/L, which was statistically significantly higher than that in control group (9. 52 μmol/L) (P < 0. 05 ) , there was

  8. Changes and clinical significance of concentration of serum total homocysteine in patients with pregnancy induced hypertension%妊娠高血压综合征患者血清总同型半胱氨酸的变化

    Institute of Scientific and Technical Information of China (English)

    韦淑琴; 郑建华; 刘亚星; 邹丽红; 石大维

    2001-01-01

    目的 检测妊娠高血压综合征(妊高征)患者外周血中总同型半胱氨酸(tHcy)的水平,并探讨其与妊高征发病的关系。方法 应用高效液相色谱电化学检测(HPLC-ED)法检测未妊娠妇女、正常妊娠妇女以及妊高征患者血清中tHcy的水平。结果 ①非妊娠组的tHcy水平[(7.89±2.62)mol/L]与正常妊娠组[(5.91±1.96)μmol/L]相比较,差异有极显著性(P<0.001);正常妊娠组在孕中期tHcy水平[(5.23±1.88)μmol/L]降至最低。②妊高征组tHcy水平[(9.40±3.06)μmol/L]明显高于正常妊娠组(P<0.001),与非妊娠组妇女相比较,tHcy水平呈逐渐升高趋势(P值分别小于0.05,0.01,0.001);并随妊高征病情的加重,tHcy水平呈逐渐上升趋势,重度妊高征明显高于轻度妊高征(P<0.05)。结论 妊娠后tHcy水平显著升高可能是妊高征发病机制中的一个重要因素。%Objective To determine the changes in serum total homocysteine(tHcy) concentration that occur in patients with pregnancy induced hypertension (PIH),to explore the relationship between serum tHcy and pathogenesis of PIH.Methods Serum tHcy concentrations were measured in 30 healthy nonpregnant women (nonpregnancy group),36 normal pregnant women (normal pregnancy group) and 42 women with PIH (PIH group) by high-pressure liquid chromatography (HPLC) with electrochemical detection.Results ① Serum tHcy concentrations were significantly lower in normal pregnancy group,(5.91±1.96)μmol/L than those in nonpregnancy group,(7.89±2.62)μmol/L (P<0.001),the lowest level in the second trimester of pregnancy,(5.23±1.88)μmol/L.②Serum tHcy concentrations,(9.40±3.06)μmol/L in PIH group were significantly higher than those in normal pregnancy group,(5.91±1.96)μmol/L(P<0.001).There was a trend that serum tHcy concentrations in PIH group gradually increased as compared with nonpregnancy group(P<0.05,0.01,0

  9. The evaluation of serum homocysteine, folic acid, and vitamin B12 in patients complicated with preeclampsia.

    Science.gov (United States)

    Shahbazian, Nahid; Jafari, Razieh Mohammad; Haghnia, Sahar

    2016-10-01

    Increased plasma homocysteine may be associated with adverse pregnancy outcomes, such as preeclampsia. The aim of this study was to determine the plasma homocysteine, serum folate, and vitamin B12 levels in preeclamptic pregnant women. This case-control study was conducted in 2016 in Ahwaz on 51 pregnant women with preeclampsia and 51 healthy pregnant women of the same gestational age, who served as controls. The case group also was subdivided into severe and non-severe preeclampsia. Patients' data were collected through a questionnaire and medical records. Serum homocysteine, folic acid, and vitamin B12 were analyzed using chemiluminescent assay. The results were compared between two groups. Statistical analyses were done using IBM-SPSS 20.0. A Kolmogorov-Smirnov test, independent samples t-test, Mann-Whitney test, and Chi-square test were used for data analysis. No different demographic characteristics were found among the groups. Pregnant women complicated with preeclampsia displayed significantly higher serum homocysteine levels (p vitamin B12 levels (p vitamin B12, but it was not statistically significant (p = 0.160; r = -0.200). Significant differences occurred in serum homocysteine and folate levels between the severe and non-severe subgroups (p vitamin B12. Further studies are needed to confirm if the prescription of folic acid and vitamin B12 in women with a deficiency of these vitamins could decrease the level of serum homocysteine and, therefore, reduce the risk of preeclampsia or, if it occurred, its severity.

  10. A prospective study of maternal fatty acids, micronutrients and homocysteine and their association with birth outcome.

    Science.gov (United States)

    Wadhwani, Nisha S; Pisal, Hemlata R; Mehendale, Savita S; Joshi, Sadhana R

    2015-10-01

    Our earlier studies both in animals and in humans have indicated that micronutrients (folic acid, vitamin B12) and long-chain polyunsaturated fatty acids, especially docosahexaenoic acid (DHA), are interlinked in the one-carbon cycle, which plays an important role in fetal 'programming' of adult diseases. The present study examines the levels of maternal and cord plasma fatty acids, maternal folate, vitamin B12 and homocysteine in healthy mothers at various time points during pregnancy and also examine an association between them. A longitudinal study of 106 normal pregnant women was carried out, and maternal blood was collected at three time points, viz., T1 = 16-20th week, T2 = 26-30th week and T3 = at delivery. Cord blood was collected at delivery. Fatty acids were estimated using a gas chromatograph. Levels of folate, vitamin B12 and homocysteine were estimated by the chemiluminescent microparticle immunoassay (CMIA) technology. Maternal plasma folate (P homocysteine levels were highest (P homocysteine at T2 (P homocysteine at T1 were inversely associated with baby weight at delivery. Our study provides evidence for the associations of folic acid, vitamin B12, homocysteine with DHA and baby weight, suggesting that a balanced dietary supplementation of folate-vitamin B12-DHA during pregnancy may be beneficial.

  11. Peritoneal clearance of homocysteine with icodextrin or standard glucose solution exchange.

    Science.gov (United States)

    Czupryniak, Aneta; Nowicki, Michal; Chwatko, Grazyna; Jander, Anna; Bald, Edward

    2005-12-01

    The aim of the study was to assess plasma homocysteine concentration in peritoneal dialysis patients, and to compare the effect of different peritoneal solutions (glucose-based and icodextrin-based) on peritoneal clearance of homocysteine. The study group comprised 10 chronic peritoneal dialysis patients; the control group comprised 15 healthy, age-matched non-obese subjects with normal renal function. Patients with vitamin B(12) or folate deficiency were excluded. In all subjects, plasma homocysteine and dialysis adequacy parameters were assessed at baseline. The clearance study was carried out with 2.27% glucose and 7.5% icodextrin solutions (12-h dwell time). Mean dialysate concentration of homocysteine was similar for both glucose and icodextrin solutions (8.3 +/- 3.2 and 8.4 +/- 1.9 micromol/L, respectively), but homocysteine clearance was significantly higher for icodextrin than glucose solution (1.82 +/- 0.57 vs 1.39 +/- 0.53 mL/min per 1.73 m(2)P = 0.01). Net ultrafiltration after icodextrin solution was also higher than after glucose solution (599 +/- 136 mL vs 134 +/- 337 mL, P Icodextrin-based solution for peritoneal dialysis seems to be more efficient in homocysteine elimination than a standard glucose-based solution.

  12. 叶酸代谢相关基因的多态性与唐氏综合征的关系%Relationship between genetic polymorphisms of folate metabolism, plasma homocysteine levels and risk of Down syndrome

    Institute of Scientific and Technical Information of China (English)

    王文; 刘福民; 严晓南; 陈红

    2009-01-01

    Objective To investigate whether genetic polymorphisrns of methylenetetrahydrofolate reductase (MTHFR) contribute to the risk of Down syndrome(DS). Methods Altogether, 100 Chinese mothers who had given birth to DS babies (study group) and 100 matched mothers (control) were chosen and all were Han nationality. Genotypes of MTHFR 677 and MTHFR 1298 were determined by PCR-RFLP and MGB-Taqman resl-time PCR. The concentration of plasma homocysteine (HCY) was measured by chemilumineaence. Results The mutations of one or both alleles of MTHFR 677 and MTHFR 1298 were associated with a 2. 37-fold(95%CI: 1.19~3.05) and 1.97-fold(95%CI: 1.04~3.75) increase in the risk of having a child with DS. Combination of MTHFR 677CT and 1298AC/CC genotype had a 5. 62-fold increased risk of having a child with DS(95%Ch 1.86~17.03) and the combination of MTHFR 677TT and MTHFR 1298AC/CC genotype was significantly associated with an increased risk of DS(OR=11.84, 95%CI: 1.39~100.62). The mean plasma HCY concentration was significantly higher in the study group than that of control [(9.04±3.85) μmol/L vs (6.53±2. 06) μmol/L, P0.05). Higher HCY level was found in the genotype-pairs of MTHFR 677CT/TT and 1298AC/CC (P0.05).同时存在MTHFR 677CT/TT和1298AC/CC基因组合可使血浆HCY水平增高(P<0.05).结论 HCY/叶酸代谢相关基因的多态与汉族妇女生育DS患儿的风险相关,且可能存在基因的协同作用.

  13. Homocysteine and coronary heart disease

    DEFF Research Database (Denmark)

    Clarke, Robert; Bennett, Derrick A; Parish, Sarah

    2012-01-01

    Moderately elevated blood levels of homocysteine are weakly correlated with coronary heart disease (CHD) risk, but causality remains uncertain. When folate levels are low, the TT genotype of the common C677T polymorphism (rs1801133) of the methylene tetrahydrofolate reductase gene (MTHFR...

  14. Homocysteine, S-adenosylmethionine and S-adenosylhomocysteine are associated with retinal microvascular abnormalities : the Hoorn Study

    NARCIS (Netherlands)

    van Hecke, Manon V.; Dekker, Jacqueline M.; Nijpels, Giel; Teeerlink, Tom; Jakobs, Cornelis; Stolk, Ronald P.; Heine, Rob J.; Bouter, Lex M.; Polak, Bettine C. P.; Stehouwer, Coen D. A.

    2008-01-01

    The aim of the present study was to investigate the relationship between homocysteine and homocysteine metabolism components and retinal microvascular disorders in subjects with and without Type 2 diabetes. In this population-based study of 256 participants, aged 60-85 years, we determined total pla

  15. Homocysteine, S-adenosylmethionine and S-adenosylhomocysteine are associated with retinal microvascular abnormalities : the Hoorn Study

    NARCIS (Netherlands)

    van Hecke, Manon V.; Dekker, Jacqueline M.; Nijpels, Giel; Teeerlink, Tom; Jakobs, Cornelis; Stolk, Ronald P.; Heine, Rob J.; Bouter, Lex M.; Polak, Bettine C. P.; Stehouwer, Coen D. A.

    The aim of the present study was to investigate the relationship between homocysteine and homocysteine metabolism components and retinal microvascular disorders in subjects with and without Type 2 diabetes. In this population-based study of 256 participants, aged 60-85 years, we determined total

  16. Association between plasma homocysteine and cognitive dysfunction in patients with Parkinson’s disease%帕金森病患者血浆同型半胱氨酸水平与认知功能障碍相关性研究

    Institute of Scientific and Technical Information of China (English)

    蔡江萍; 李国前; 洪全龙; 魏晓兰; 黄丹霞

    2014-01-01

    目的:探讨帕金森病(Parkinson’s disease,PD)患者血浆同型半胱氨酸(Homocysteine,Hcy)水平与认知功能障碍的相关性。方法选取106例PD患者(包含认知障碍者55例,认知正常者51例)及50例健康对照者,收集临床资料、认知功能评估,应用高效液相色谱法测定血浆Hcy浓度,放射免疫法测定血浆叶酸、维生素B12浓度,分析血浆Hcy含量与认知功能的相关性。结果认知障碍组血浆Hcy值显著高于认知正常组,差异具有统计学意义(P<0.05),两组血浆叶酸、维生素B12浓度无统计学差别。PD认知障碍组简易智能状态量表评分及蒙特利尔认知评估量表评分均与血浆Hcy值存在显著负相关。结论血浆Hcy升高与PD认知功能障碍存在显著相关性,血浆Hcy升高可能是PD认知损害的一个风险因子。%Objective To study the association between the level of plasma homocysteine(Hcy) and the cognitive dysfunction in patients with Parkinson’s disease(PD).Methods Total 156 subjects were enrolled, including 50 unrelated healthy controls and 106 patients with PD. The basic information, disease situation and cognitive function of patients with PD were investigated and the plasma concentrations of Hcy, folic acid and vitamin B12 were detected in each subject. The relationship between plasma Hcy levels and the cognitive function was assessed.Results The plasma Hcy concentrations of cognitive dysfunction group were higher than those of normal cognitive group [(21.5±5.1)μmmol/L vs(14.7±4.7)μmmol/L,P<0.05] and there were no differences in plasma concentrations of folic acid and vitamin B12 among the groups. The scores of the Mini-mental state examination(MMSE) and Montreal cognitive assessment(MoCA) all showed significant correlations with plasma Hcy in patients with PD.Conclusion The elevated plasma Hcy level is significantly associated with the cognitive dysfunction.The increase of plasma Hcy

  17. The homocysteine distribution: (mis)judging the burden.

    Science.gov (United States)

    de Bree, A; Verschuren, W M; Blom, H J; de Graaf-Hess, A; Trijbels, F J; Kromhout, D

    2001-05-01

    The nonfasting plasma total homocysteine (P-tHcy) concentration was measured in a random sample of 3025 Dutch adults aged 20-65 years (main study). The positively skewed distribution had a geometric mean of 13.9 micromol/L in men and 12.6 micromol/L in women. Blood of the main study was not cooled or centrifuged immediately after drawing. A stability study (n = 26) indicated that this could have resulted in a small (0.4 micromol/L) overestimation of the means. A comparative study (n = 88), and a reproduction of these results in an entirely different population (n = 213), showed a systematic difference in P-tHcy concentration of -2.4 micromol/L between our laboratory (Nijmegen, the Netherlands) and that in Bergen, Norway. With the information of the additional studies we provided precise and valid data of the Dutch P-tHcy distribution, from which we conclude the status in the Netherlands is worse than in other European countries. Furthermore, we showed that comparison of P-tHcy data is complicated unless the interlaboratory differences are known. @ 2001 Elsevier Science Inc.

  18. Cochlear Homocysteine Metabolism at the Crossroad of Nutrition and Sensorineural Hearing Loss

    Directory of Open Access Journals (Sweden)

    Isabel Varela-Nieto

    2017-04-01

    Full Text Available Hearing loss (HL is one of the most common causes of disability, affecting 360 million people according to the World Health Organization (WHO. HL is most frequently of sensorineural origin, being caused by the irreversible loss of hair cells and/or spiral ganglion neurons. The etiology of sensorineural HL (SNHL is multifactorial, with genetic and environmental factors such as noise, ototoxic substances and aging playing a role. The nutritional status is central in aging disability, but the interplay between nutrition and SNHL has only recently gained attention. Dietary supplementation could therefore constitute the first step for the prevention and potential repair of hearing damage before it reaches irreversibility. In this context, different epidemiological studies have shown correlations among the nutritional condition, increased total plasma homocysteine (tHcy and SNHL. Several human genetic rare diseases are also associated with homocysteine (Hcy metabolism and SNHL confirming this potential link. Accordingly, rodent experimental models have provided the molecular basis to understand the observed effects. Thus, increased tHcy levels and vitamin deficiencies, such as folic acid (FA, have been linked with SNHL, whereas long-term dietary supplementation with omega-3 fatty acids improved Hcy metabolism, cell survival and hearing acuity. Furthermore, pharmacological supplementations with the anti-oxidant fumaric acid that targets Hcy metabolism also improved SNHL. Overall these results strongly suggest that cochlear Hcy metabolism is a key player in the onset and progression of SNHL, opening the way for the design of prospective nutritional therapies.

  19. 血浆同型半胱氨酸水平、脑萎缩与认知障碍的相关性研究%Correlation Study on Plasma Homocysteine, Brain Atrophy and Cognitive Impairment

    Institute of Scientific and Technical Information of China (English)

    邱小娥

    2011-01-01

    目的 探讨认知障碍程度与血浆同型半胱氨酸(Hcy)水平、脑萎缩系列指标的相关性.方法 将研究对象分为重度AD、中度AD、轻度AD、MCI、正常对照五组,测定其血浆Hcy水平和哈氏值、侧脑室体部指数、沟间距、左右外侧裂宽度、第三脑室宽度几项指标,并研究其统计学相关性.结果 随认知障碍程度的增加,血浆同型半胱氨酸水平也增加,Hcy浓度与重度AD、中度AD、轻度AD、MCI、正常对照五组的MMSE评分Spearman分析分别为r=-0.365、r=-0.389、r=-0.433、r=-0.424、r=-0.412;沟间距、左侧外宽度、右侧外宽度、第三脑室密度和哈氏值均与MMSE评分呈明显的负相关,Spearman分析分别为r=-0.457,r=-0.629,r=-0.636,r=-0.701,r=-0.533,而侧脑室体部指数与MMSE评分呈明显的正相关,Spearman分析r=0.654;Logistic回归模型结果显示Hcy浓度、左侧外宽度、侧脑室体部指数和哈氏值在各组的比较差异有统计学意义(P<0.05),为认知障碍的影响因素.结论 认知障碍的程度与Hcy浓度、左侧外宽度、侧脑室体部指数和哈氏值存在关联.%Objective To explore the correlation between cognitive impairment and plasma levels of homocysteine (Hcy), the indexes of brain atrophy.Methods The surveyed individuals were divided into severe AD group, moderate AD group, mild AD group, MCI group, and normal control group.Plasma homocysteine (Hcy) levels, Huckmam's values, index of somatic part of lateral ventricle, interuncal distance, width of left end right lateral fissure, and extend of the third ventricle in the five groups were examined.The relationships between Hcy levels and MMSE score in the five groups were analyzed with Spearman correlation enalysis.Results The plasma Hcy levels were increased with the increasing degree of cognitive impairment.Spearman correlation analysis showed that the relationships between Hcy levels end MMSE score in severe AD group, moderate AD group

  20. Accurate measurement of the essential micronutrients methionine, homocysteine, vitamins B6, B12, B9 and their metabolites in plasma, brain and maternal milk of mice using LC/MS ion trap analysis

    NARCIS (Netherlands)

    Oosterink, J.E.; Naninck, E.F.G.; Korosi, A.; Lucassen, P.J.; van Goudoever, J.B.; Schierbeek, H.

    2015-01-01

    Methionine, homocysteine, vitamins B6, B12, B9, and their metabolites are crucial co-factors and substrates for many basic biological pathways including one-carbon metabolism, and they are particularly important for brain function and development and epigenetic mechanisms. These are essential nutrie

  1. Study on correlation between plasma homocysteine levels and TCM syndromes of dementia%痴呆的中医证型与血浆同型半胱氨酸水平相关性分析

    Institute of Scientific and Technical Information of China (English)

    徐新春; 张慧; 林梅; 陈雷

    2013-01-01

    目的 了解痴呆患者的中医证型与血浆同型半胱氨酸(Hcy)水平的关系.方法 将病例资料分为痴呆组(120例)、非痴呆组(130例),比较两组患者血浆Hcy水平,同时对痴呆患者进行中医辨证,对不同证型患者的Hcy水平进行比较.结果 痴呆患者血浆Hcy (17.13±9.01) nmol/ml明显高于非痴呆者(12.81±7.94) nmol/ml;痰浊阻窍者血浆Hcy水平(18.43±7.81) noml/ml明显高于其他5型[瘀阻脑络(5.38±8.91) nmol/ml、肾虚髓亏(16.44±9.05) nmol/ml、肾阴亏虚(16.19±9.24) nmol/ml、肝经火旺(15.92±7.28) nmol/ml、脾肾阳虚(12.26±5.17) nmol/ml,P<0.01].结论 高Hcy可能是痴呆发病的高危险因素之一.%Objective To investigate the relationship between plasma homocysteine (Hcy) levels and TCM syndromes of dementia.Methods 250 cases were divided into a dementia group (120 cases) and non-dementia group (130 cases).120 cases in the dementia group include 36 Alzheimer dementia(AD) patients and 84 vascular dementia (VaD) patients.The plasma levels of Hcy were measured in all 250 cases.The relationship between Hcy levels,TCM syndromes and dementia was analyzed.Results The level of plasma Hcy was significantly higher in the dementia group (17.13 ± 9.01) nmol/ml than that in the non-dementia group (12.81 ± 7.94) nmol/ml,and it was highest in the VaD patients (P<0.01).The mean of Hcy concentration in obstruction of phlem-turbid syndrome was higher(18.43±7.81)nmol/ml than syndromes [Tanyuzuluo (5.38 ± 8.91)nmol/ml,Shenxusuikui (16.44 ± 9.05)nmol/ml,Shenyinkuixu(16.19 ± 9.24)nmol/ml,Ganjinghuowang (15.92 ± 7.28)nmol/m1,Pishen-Yangxu(12.26 ± 5.17) nmol/ml (P < 0.01)].Conclusion Increased plasma Hcy levels may be one of the risk factors leading to AD or VaD.

  2. Effects of homocysteine lowering with B vitamins on cognitive aging; meta-analysis of 11 trials with cognitive data on 22,000 individuals

    NARCIS (Netherlands)

    Clarke, R.; Bennett, D.; Parish, S.; Eussen, S.J.P.M.; Groot, de C.P.G.M.

    2014-01-01

    Background: Elevated plasma homocysteine is a risk factor for Alzheimer disease, but the relevance of homocysteine lowering to slow the rate of cognitive aging is uncertain. Objective: The aim was to assess the effects of treatment with B vitamins compared with placebo, when administered for several

  3. Total plasma protein in very preterm babies: prognostic value and comparison with illness severity scores.

    Directory of Open Access Journals (Sweden)

    Silvia Iacobelli

    Full Text Available OBJECTIVE: We aimed to investigate the predictive value for severe adverse outcome of plasma protein measurements on day one of life in very preterm infants and to compare total plasma protein levels with the validated illness severity scores CRIB, CRIB-II, SNAP-II and SNAPPE-II, regarding their predictive ability for severe adverse outcome. METHODS: We analyzed a cohort of infants born at 24-31 weeks gestation, admitted to the tertiary intensive care unit of a university hospital over 10.5 years. The outcome measure was "severe adverse outcome" defined as death before discharge or severe neurological injury on cranial ultrasound. The adjusted odd ratio (aOR and 95% confidence interval (95% CI of severe adverse outcome for hypoproteinemia (total plasma protein level <40 g/L was calculated by univariate and multivariate analyses. Calibration (Hosmer-Lemeshow goodness-of-fit was performed and the predictive ability for severe adverse outcome was assessed for total plasma protein and compared with CRIB, CRIB-II, SNAP-II and SNAPPE-II, by calculating receiver operating characteristic (ROC curves and their associated area under the curve (AUC. RESULTS: 761 infants were studied: 14.4% died and 4.1% survived with severe cerebral ultrasound findings. The aOR of severe adverse outcome for hypoproteinemia was 6.1 (95% CI 3.8-9.9. The rank order for variables, as assessed by AUCs and 95% CIs, in predicting outcome was: total plasma protein [0.849 (0.821-0.873], SNAPPE-II [0.822 (0.792-0.848], CRIB [0.821 (0.792-0.848], SNAP-II [0.810 (0.780-0.837] and CRIB-II [0.803 (0.772-0.830]. Total plasma protein predicted severe adverse outcome significantly better than CRIB-II and SNAP-II (both p<0.05. Calibration for total plasma protein was very good. CONCLUSIONS: Early hypoproteinemia has prognostic value for severe adverse outcome in very preterm, sick infants. Total plasma protein has a predictive performance comparable with CRIB and SNAPPE-II and greater than

  4. Accuracy of plasma turbidity measurement for determining fat intolerance during total parenteral nutrition.

    Science.gov (United States)

    Nordenström, J; Thörne, A; Lindholm, M

    1990-06-01

    The accuracy of plasma turbidity measurements in predicting ability to metabolise intravenous fat emulsions during total parenteral nutrition was studied in 35 adult surgical patients. Plasma turbidity, expressed as a light scattering index (LSI), was determined by nephelometry and compared with measured triglyceride (TG) concentrations. A poor coefficient of correlation was found between LSI and TG (r = 0.52). The sensitivity and specificity of LSI in predicting TG concentration were 19% and 96% respectively. This indicates that the measurement of LSI is more useful in ruling out hypertriglyceridaemia than in detecting it. Consequently, clinical tolerance of intravenous fat emulsion cannot be monitored by measuring plasma turbidity. In order to avoid metabolic complications which may occasionally occur during intravenous nutritional therapy including fat emulsion, determination of plasma TG levels at timed intervals are recommended.

  5. Effects of plasma total ammonia content and pH on urea excretion in Nile tilapia.

    Science.gov (United States)

    McKenzie, D J; Piraccini, G; Felskie, A; Romano, P; Bronzi, P; Bolis, C L

    1999-01-01

    Nile tilapia (Oreochromis niloticus) were infused with ammonium salts, acid, and base to investigate the effects of changes in arterial plasma total ammonia content (Tamm) and pH (pHa) on plasma urea-nitrogen (urea-N) levels and urea-N excretory fluxes (Jurea-N). The tilapia did not possess a functional hepatic ornithine urea-cycle (no significant carbamyl phosphate synthetase III activity). Infused substances were dissolved in a saline vehicle and injected twice (5 mL kg-1), the first infusion to "prime" the animal and promote a more marked response to the second infusion, given 2.5 h later. The results reported are those of the second infusion. Infusion of 200 mM NH4Cl increased Tamm, reduced pHa, and increased plasma urea-N and Jurea-N. Two hundred mM NH4HCO3 increased Tamm and arterial plasma total CO2 content (TaCO2), reduced pHa, and increased Jurea-N. Fifty mM HCl reduced pHa but had no effects on urea dynamics. Fifty mM NaOH increased pHa, plasma urea-N levels, and Jurea-N. Two hundred mM NaHCO3 increased pHa, TaCO2, plasma urea-N levels, and Jurea-N. Infusion of the saline vehicle was without effect. The results indicate that ammonia loading and plasma alkalosis both stimulate urea excretion in uricolytic fish. The responses to hyperammonemia or alkalosis were not modified when combined with elevated plasma bicarbonate levels.

  6. Total plasma proANP increases with atrial dilatation in horses

    DEFF Research Database (Denmark)

    Van Der Vekens, N; Hunter, I; Timm, A

    2015-01-01

    Equine atrial natriuretic peptide (ANP) plasma concentrations are correlated with left atrial size. However, species-specific assays are lacking and the results from human assays are poorly reproducible. A new methodology called processing independent analysis (PIA) that measures the total pro......ANP product in plasma has proven to be successful in human medicine, but has never been used in horses. The aims were to establish an equine proANP reference interval by measurement of the total proANP product using PIA and to examine the proANP concentrations in horses with atrial dilatation. Sample...... stability was studied by comparison of storage at -80°C and -20°C. Plasma samples were obtained from 23 healthy horses, 12 horses with moderate or severe valvular regurgitation without atrial dilatation and 42 horses with valvular regurgitation and atrial dilatation. The proANP concentration...

  7. Plasma atrial natriuretic peptide after the Fontan procedure and total cavopulmonary connexion.

    Science.gov (United States)

    Burch, M; Shinebourne, E A; Rigby, M L; Carter, N; Jeffery, S; Stanley, P; Smith, A

    1990-05-01

    Plasma atrial natriuretic peptide was measured in 10 children undergoing the Fontan procedure and 3 children undergoing total cavopulmonary connexion. There was no significant difference in pre-operative plasma levels, but post-operative levels were significantly higher 48 hours after cardiopulmonary bypass in the Fontan group. There was no significant difference in plasma arginine vasopressin levels either pre- or post-operatively. Post-operative pleural effusions occurred in only 2 of the 10 patients undergoing the Fontan procedure, but were present in all 3 of those undergoing total cavopulmonary connexion. The release of atrial natriuretic peptide is an appropriate homeostatic response to volume loading and the impairment of this response in the early post-operative period may be of clinical importance.

  8. Correlative research between homocysteine,cystatin C and patients with essential hypertension and hypertensive intracerebral hemorrhage

    Institute of Scientific and Technical Information of China (English)

    孙屿

    2014-01-01

    Objective To investigate the correlation between homocysteine(Hcy),cystatin C(Cys C)and patients with essential hypertension and hypertensive intracerebral hemorrhage.Methods Subjects were divided into hypertensive intracerebral hemorrhage group(108 cases),essential hypertension group(100 cases)and control group(100 cases),and their cystatin C,homocysteine and total cholesterol(TC)and triglycerides(TG)were surveyed.Results The patients with hypertensive intracerebral hemorrhage and essential hypertension had higher

  9. Spectrophotometric determination of total proteins in blood plasma: a comparative study among dye-binding methods

    OpenAIRE

    Dimas Augusto Morozin Zaia; Fábio Rangel Marques; Cássia Thaïs Bussamra Vieira Zaia

    2005-01-01

    A comparative study between the biuret method (standard method for total proteins) and spectrophotometric methods using dyes (Bradford, 3',3",5',5"-tetrabromophenolphthalein ethyl ester-TBPEE, and erythrosin-B) was carried out for the determination of total proteins in blood plasma from rats. Bradford method showed the highest sensitivity for proteins and biuret method showed the lowest. For all the methods, the absorbance for different proteins (BSA, casein, and egg albumin) was measured and...

  10. Plasma free and total carnitine measured in children by tandem mass spectrometry

    OpenAIRE

    J.H. Osorio; Pourfarzam, M.

    2002-01-01

    Free and total carnitine quantification is important as a complementary test for the diagnosis of unusual metabolic diseases, including fatty acid degradation disorders. The present study reports a new method for the quantification of free and total carnitine in dried plasma specimens by isotope dilution electrospray tandem mass spectrometry with sample derivatization. Carnitine is determined by looking for the precursor of ions of m/z = 103 of N-butylester derivative, and the method is valid...

  11. Child's homocysteine concentration at 2 years is influenced by pregnancy vitamin B12 and folate status.

    Science.gov (United States)

    Lubree, H G; Katre, P A; Joshi, S M; Bhat, D S; Deshmukh, U S; Memane, N S; Otiv, S R; Rush, E C; Yajnik, C S

    2012-02-01

    Longitudinal studies investigating vitamin B12 and folate status of mothers and their offspring will provide a better understanding of intergenerational nutrition. During pregnancy and 2 years (2y) after delivery, we measured plasma vitamin B12 and folate concentrations in 118 women [aged (mean ± s.d.) 22.9 ± 3.9y] who attended a rural (n = 68) or an urban (n = 50) antenatal clinic in Pune, India. Cord blood vitamin B12 and folate were measured, and when the child was 2y total homocysteine (tHcy) was also measured. Demographic and diet measurements were recorded using standard methods. Pregnancy plasma vitamin B12 concentration at 34 weeks was low [median (25th, 75th), 115 (95, 147) pm]; 75% had low status (vitamin B12 and folate concentrations were higher than and positively associated with maternal concentrations. In stepwise regression, higher child vitamin B12 at 2y was predicted (total R 2 15.7%) by pregnancy vitamin B12 (std β 0.201, R 2 7.7%), current consumption of cow's milk (std β 0.194, R 2 3.3%) and whether breast feeding was stopped before 2y (std β -0.234 R 2 7.2%). Child's 2y tHcy concentration was high (11.4 ± 3.6 μm) and predicted by lower pregnancy vitamin B12 (std β -0.206, R 2 4.1%), lack of vitamin supplementation (std β -0.256, R 2 5.6%) in pregnancy and whether currently breastfed (std β 0.268, R 2 8.4%). Low maternal vitamin B12 status in pregnancy and prolonged breast-feeding results in disturbed one-carbon metabolism in offspring at 2y. Supplementation of women of child-bearing age, particularly during pregnancy and lactation, may improve the homocysteine status of these children.

  12. Plasma total thiol pool in children with asthma: Modulation during montelukast monotherapy.

    Science.gov (United States)

    Dilek, Fatih; Ozkaya, Emin; Kocyigit, Abdurrahim; Yazici, Mebrure; Guler, Eray Metin; Dundaroz, Mehmet Rusen

    2016-03-01

    Inflammation, which is a hallmark of asthma, is one of the main sources of oxidative stress in the human body. Thiols are powerful antioxidants that protect cells against the consequences of oxidative stress. We aimed to investigate whether asthma and montelukast monotherapy affect the total plasma thiol pool in children. A total of 60 children with asthma and 35 healthy controls participated in the study. Group I consisted of newly diagnosed asthmatics who did not have regular anti-asthmatic therapy previously. Group II consisted of patients who had been undertaking montelukast monotherapy regularly for at least 4 months. Plasma total antioxidant status (TAS) and plasma total thiol (PTT) were measured using spectrophotometric methods. Bronchial asthma patients in both groups I and II had decreased median TAS levels compared with the control group (1.59 [interquartile range, 1.04-1.70] and 1.67 [1.50-1.75] vs. 2.98 [2.76-3.16] Trolox equiv./L, respectively; P0.05). In addition, the median TAS and PTT levels for groups I and II were not statistically different (P>0.05). There was a positive correlation between TAS and PTT levels (rho=0.38, Pchildren with asthma. Montelukast monotherapy can limit oxidative stress and thus restore PTT levels but not TAS levels in asthmatic children. © The Author(s) 2015.

  13. Relationships between maternal plasma levels of homocysteine, nitric oxide synthase, inducible nitric oxide synthase and fetal neural tube defects%孕产妇血浆一氧化氮合酶和高半胱氨酸水平与胎儿神经管畸形的关系

    Institute of Scientific and Technical Information of China (English)

    谷强; 李鹰; 陈波; 罗小平

    2013-01-01

    Objective To investigate the relationships between fetal neural tube defects (NTD) and maternal plasma homocysteine (Hcy) level,total nitric oxide synthase (NOS) and inducible NOS (iNOS) activity.Methods A total of 28 pregnant women with clinically or prenatal ultrasound diagnosed NTD offspring in Shihezi City and its surrounding areas of the Xinjiang Uygur Autonomous Region from January 6,2008 to May 23,2011 were enrolled as NTD group.Another 41 normal pregnant women,matched in corresponding area and period,were enrolled as the control group.The plasma level of Hcy was determined by rate method,and the activities of total NOS and iNOS were detected by spectrophotometry.Linear correlation analysis and t-test were used as statistical method.Results The plasma level of Hcy in NTD group was higher than that in the control group with statistically significant difference [(15.2±7.9) μmol/L vs (8.4±3.7) μmol/L,t=4.269,P<0.01].The activity of total NOS was lower in the NTD group than that in the control group [(20.0±9.0) U/ml vs (26.0±4.1) U/ml,t=3.258],so was the activity of iNOS [(7.5±2.9) U/ml vs (12.0±4.5) U/ml,t=4.670],the differences were statistically significant (both P<0.01).Linear correlation analysis showed a negative correlation between the level of Hcy and the activity of total NOS (r=0.325,P<0.01),but no correlation was found with iNOS (r=0.205,P>0.05).Conclusions High level of Hcy and low activity of NOS and iNOS might be correlated with fetal NTD.%目的 探讨我国新疆维吾尔自治区石河子市及周边地区孕产妇血浆中总一氧化氮合酶(nitric oxide synthase,NO)S)、诱导型一氧化氮合酶(inducible nitric oxide synthase,iNOS)活性和高半胱氨酸(homocysteine,Hcy)水平与胎儿神经管畸形(neural tube defect,NTD)之间的相关性.方法 选择2008年1月6日至2011年5月23日28例经B超及临床确诊胎儿/新生儿NTD的孕产妇为NTD组,选取同期同地区正常孕产妇41例为对照组.采用分光

  14. Plasma Total Antioxidant Capacity and Cardiometabolic Risk in Non-Obese and Clinically Healthy Young Adults.

    Science.gov (United States)

    Costa, Jamille Oliveira; Vásquez, Cecília M Passos; Santana, Gleiciane de Jesus; Silva, Natanael de Jesus; Braz, Juciene de Matos; Jesus, Amélia M Ribeiro de; Silva, Danielle Góes da; Cunha, Luana Celina Seraphim; Barbosa, Kiriaque Barra Ferreira

    2017-07-10

    The oxidative biomarkers play an important role in the genesis of cardiometabolic risk-related processes. To investigate the total antioxidant capacity of plasma and its association with cardiometabolic risk in non-obese and clinically healthy young adults. University students of the state of Sergipe, Brazil, aged between 18 and 25 years, were recruited for this study from May of 2013 and October of 2014. Anthropometric, clinical and biochemical parameters were measured and analyzed using protocols which were previously standardized and described in the literature. The measurement of plasma total antioxidant capacity was based on the ability that all the antioxidants present in the sample (plasma) have to inhibit the oxidation of the oxidizable substrate ABTS (2,2`- Azino-di-[3-ethylbenzthiazoline sulphonate]) to ABTS•+ by metmyoglobin. Approximately 25% of the sample presented more than one component of cardiometabolic risk. Low HDL-cholesterol was the most prevalent component. Compared to absence of components, the subjects with at least one component presented greater body weight and waist circumference, higher levels of diastolic blood pressure and fasting glucose, greater total cholesterol/HDL-c ratio, and lower levels of HDL-c (p literatura. A medida da capacidade antioxidante total do plasma baseou-se na capacidade de todos os antioxidantes presentes na amostra (plasma) em inibir a oxidação do substrato oxidável ABTS (2,2-Azino-bis-(3-etilbenzotiazolina-6-sulfonato) a ABTS•+ pela metamioglobina. Aproximadamente 25% da amostra apresentaram mais de um componente do risco cardiometabólico. Valores baixos de HDL foram o componente mais prevalente. Em comparação à ausência de componentes, os indivíduos com pelo menos um componente apresentou valores mais altos de peso corporal, circunferência da cintura, pressão sanguínea diastólica, glicemia de jejum e razão colesterol total/HDL-c, e valores mais baixos de HDL-c (p < 0,05). A glicemia de jejum

  15. Acute Exercise Increases Plasma Total Antioxidant Status and Antioxidant Enzyme Activities in Untrained Men

    OpenAIRE

    Berzosa, C.; I. Cebrián; Fuentes-Broto, L.; E. Gómez-Trullén; Piedrafita, E.; Martínez-Ballarín, E.; López-Pingarrón, L.; Reiter, R. J.; García, J. J.

    2011-01-01

    Antioxidant defences are essential for cellular redox regulation. Since free-radical production may be enhanced by physical activity, herein, we evaluated the effect of acute exercise on total antioxidant status (TAS) and the plasma activities of catalase, glutathione reductase, glutathione peroxidase, and superoxide dismutase and its possible relation to oxidative stress resulting from exercise. Healthy untrained male subjects ( = 3 4 ) performed three cycloergometric tests, including maxi...

  16. Effects of total gastrectomy on plasma silicon and amino acid concentrations in men.

    Science.gov (United States)

    Tatara, Marcin R; Krupski, Witold; Szpetnar, Maria; Dąbrowski, Andrzej; Bury, Paweł; Szabelska, Anna; Charuta, Anna; Boguszewska-Czubara, Anna; Maciejewski, Ryszard; Wallner, Grzegorz

    2015-12-01

    The aim of the study was to determine one-year effects of total gastrectomy on plasma silicon and free amino acid concentrations in patients and evaluate changes of volumetric bone mineral density (vBMD) in lumbar spine. Eight patients were enrolled to the control (CTR) group. Six patients subjected to total gastrectomy (GX group) were included to the experimental group. vBMD in trabecular and cortical bone was measured in lumbar vertebrae at baseline (before surgery) and one year later using quantitative computed tomography. Plasma concentrations of silicon and free amino acids were determined at baseline and one year later using photometric method and ion-exchange chromatography. Body weights within CTR and GX groups were not different after one-year follow-up when compared to the baseline values (P > 0.05). An average annual decrease of vBMD in the trabecular bone in the gastrectomized patients reached 15.0% in lumbar spine and was significantly different in comparison to the percentage changes observed in CTR group (P = 0.02). One-year percentage change of vBMD in the cortical bone in L1 and L2 has shown significantly decreased values by 10.5 and 9.1% in the GX group when compared to the percentage change observed in the controls (P silicon was significantly lowered by 26.7% one year after the total gastrectomy when compared to the baseline value (P = 0.009). Total gastrectomy in patients has induced severe osteoporotic changes in lumbar spine within one-year period. The observed osteoporotic changes were associated with decreased plasma concentration of silicon indicating importance of exocrine and endocrine functions of stomach for silicon homeostasis maintenance. Gastrectomy-induced bone loss was not related to decreased amino acid concentration in plasma obtained from overnight fasted patients.

  17. Polymorphism of the methylenetetrahydrofolate reductase gene association with homocysteine and ischemic stroke in type 2 diabetes

    Directory of Open Access Journals (Sweden)

    Sun Jia-Zhong

    2009-12-01

    Full Text Available Background : Ischemic stroke is a frequent heterogeneous multifactorial disease. A number of genetic mutations and environmental factors have been implicated. A polymorphism in the gene for methylenetetrahydrofolate reductase (MTHFR has been reported to be associated with hyperhomocysteinemia a risk for atherosclerotic vascular diseases. Aim : A cross-sectional study was performed to determine the relationship between the gene polymorphism for MTHFR and ischemic stroke in type 2 diabetes mellitus. Materials and Methods : Of the 215 unrelated patients with type 2 diabetes mellitus recruited, 119 patients had ischemic stroke, Control group included 142 healthy subjects. The genotype of the subjects for the C677T polymorphism of MTHFR was analyzed by using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP followed by HinfI digestion. Plasma total homocysteine (Hcy levels were measured using high-performance liquid chromatography (HPLC with fluorescence detection. Results : The genotype distribution did not differ between the control subjects and type 2 diabetic patients (P > 0.05. Plasma homocysteine levels were markedly higher in diabetic patients with TT genotype than those with CC or CT genotype (P > 0.05. Ischemic stroke was more frequently observed in type 2 diabetic patients with the TT genotype than in those with the CT and CC genotype (odds ratio=4.04, 95% CI=1.95-8.34, P=0.0036. Logistic regression analysis revealed that the C677T mutation of MTHFR gene was independently associated with ischemic stroke in type 2 diabetes. Conclusion : MTHFR C677T gene polymorphism associated with a predisposition to hyperhomocysteinemia could constitute a useful predictive marker for ischemic stroke in type 2 diabetic Chinese patients.

  18. The study on MTHFR and CBS gene polymorphisms,plasma homocysteine concentration and metabolic related factors in Chinese isolated systolic hypertension patients%单纯收缩期高血压患者MTHFR、CBS基因多态性及代谢相关因子研究

    Institute of Scientific and Technical Information of China (English)

    李玉明; 孙晓楠; 郭宏

    2003-01-01

    Objective:To study the relationship between isolated systolic hypertenson and MTHFR,CBS the keys enzyme of homocysteine metabolism,gene polymorphisms,related variation of homocysteine level,their metabolic factors,so as to screen the predisposing gene and intermediate phenotype of ISH.Methods:From Tianjin hypertension prevention and cure area selected by examinations to get 55 examples,matched control 46 example,apply the molecular biology method to detect MTHFR C677,CBS G919,T833,C341 different site gene polymorphisms,and measurese the concentration of Hcy,folic acid,vitamin B12 and B6 at the same time,then proceed the relativity analysis.Results:The genotype frequency of ISH group is different from that of control group(P<0.05).The higher frequency of T allele of MTHFR is 69.1%,observed in ISH group(P<0.01); and the mutation allelt frequency of CBS is 15.2%,different from matched control.The Hcy levels of ISH group(17.7±8.5μmol s/l)are higher than those of matched control(10.65±3.1μmol s/l,P<0.05).But the concentration of folic acid,vitamin B12 and B6 are lower compared to the controlled(P<0.05).There are more hyperhomocysteinemia patients in ISH group(P<0.05). Plasma homocyeteine play apernicious role in ISH pathogeine and folic acid may have negative effect on ISH.Conclusion:Mutation of MTHFR or CBS can both cause the elevation of plasma homocysteine so as to boost the onset of ISH.Then we can draw the conclusion that MTHFR and CBS genes may be the predisposing gene of ISH,Hcy my be the improtant intermiediate phenotype.Reasonable complementation of folic acid,vitamin B6,vitaminB12 can lower the plasma Hcy level,and defer ISH occurrence and progress.

  19. Homocysteine status and cardiovascular risk factors in patients with psoriasis: a case-control study.

    LENUS (Irish Health Repository)

    Tobin, A-M

    2012-02-01

    BACKGROUND: Psoriasis is a hyperproliferative, cutaneous disorder with the potential to lower levels of folate. This may result in raised levels of homocysteine, an independent risk factor for the development of cardiovascular disease. OBJECTIVE: A study was conducted to compare levels of red-cell folate (RCF) and homocysteine in patients with psoriasis and in healthy controls. Levels of homocysteine were also examined in the context of other major cardiovascular risk factors. METHODS: In total, 20 patients with psoriasis and 20 controls had their RCF, homo-cysteine and other conventional cardiovascular risk factors assessed. RESULTS: Patients with psoriasis had a trend towards lower levels of RCF. Significantly raised levels of homocysteine were found in patients with psoriasis compared with controls (P = 0.007). There was no correlation between homocysteine levels, RCF levels or disease activity as measured by the Psoriasis Area and Severity Index. Patients with psoriasis had higher body mass index (P < 0.004) and higher systolic blood pressure (P < 0.001) than controls. This may contribute to the excess cardiovascular mortality observed in patients with psoriasis.

  20. A whole-grain cereal-rich diet increases plasma betaine, and tends to decrease total and LDL-cholesterol compared with a refined-grain diet in healthy subjects.

    Science.gov (United States)

    Ross, Alastair B; Bruce, Stephen J; Blondel-Lubrano, Anny; Oguey-Araymon, Sylviane; Beaumont, Maurice; Bourgeois, Alexandre; Nielsen-Moennoz, Corine; Vigo, Mario; Fay, Laurent-Bernard; Kochhar, Sunil; Bibiloni, Rodrigo; Pittet, Anne-Cécile; Emady-Azar, Shahram; Grathwohl, Dominik; Rezzi, Serge

    2011-05-01

    Epidemiological studies have repeatedly found that whole-grain (WG) cereal foods reduce the risk of several lifestyle-related diseases, though consistent clinical outcomes and mechanisms are elusive. To compare the effects of a WG-rich diet with a matched refined-grain (RG) diet on plasma biomarkers and bowel health parameters, seventeen healthy subjects (eleven females and six males) completed an exploratory cross-over study with a 2-week intervention diet based on either WG- or RG-based foods, separated by a washout of at least 5 weeks. Both diets were the same except for the use of WG (150 g/d) or RG foods. Subjects undertook a 4 h postprandial challenge on day 8 of each intervention diet. After 2 weeks, the WG diet tended to decrease plasma total and LDL-cholesterol (both P = 0·09), but did not change plasma HDL-cholesterol, fasting glucose, C-reactive protein or homocysteine compared with the RG diet. Plasma betaine and alkylresorcinol concentrations were elevated after 1 week of the WG diet (P = 0·01 and P < 0·0001, respectively). Clostridium leptum populations in faeces were increased after the WG diet, along with a trend for decreased faecal water pH (P = 0·096) and increased stool frequency (P < 0·0001) compared with the RG diet. A short controlled intervention trial with a variety of commercially available WG-based products tended to improve biomarkers of CVD compared with a RG diet. Changes in faecal microbiota related to increased fibre fermentation and increased plasma betaine concentrations point to both fibre and phytochemical components of WG being important in mediating any potential health effects.

  1. Observation of plasma homocysteine level changes and therapeutic effect in elderly patients with vascular dementia%老年血管性痴呆患者血浆同型半胱氨酸的水平变化及治疗观察

    Institute of Scientific and Technical Information of China (English)

    边尧鑫; 侯静茹; 赵飞; 吴振杰; 陈冀英

    2012-01-01

    目的 观察老年血管性痴呆(VD)患者血浆同型半胱氨酸(Hcy)水平的变化及甲钴胺片联合叶酸片干预治疗对Hcy水平的影响.方法 选取51例VD患者为治疗组及60例健康志愿者为对照组,观察测定2组VD患者血浆Hcy、叶酸及维生素B12(VitB12)水平变化,并观察给予VD患者甲钴胺片联合叶酸片干预治疗前后简易精神状态检查量表(MMSE)评分及血浆Hcy、叶酸、VitB12水平变化.结果 2组治疗前血浆Hcy、叶酸及VitB12水平比较差异有统计学意义(P<0.01);治疗组治疗后血浆Hcy、叶酸及VitB12水平变化与治疗前比较差异有统计学意义(P<0.01),MMSE评分比较差异无统计学意义(P>0.05).结论 VD患者血浆中Hcy含量明显高于健康者,其叶酸及VitB12水平也处于较低的水平,给予甲钴胺片联合叶酸片治疗后明显缓解患者的高Hcy血症状态.%Objective To observe plasma homocysteine ( Hcy) level changes in elderly patients with vascular dementia ( VD) and therapeutic effect of Mecobalamin combined with folic acid intervention. Methods 51 VD patients were as treatment group. 60 healthy volunteers were as control group. The changes of plasma homocysteine, folic acid and VitB12 level in VD patients were measured. The changes of Mini - Mental State Examination (MMSE) score, plasma homocysteine, folic acid and VitB12 level were observed before and after VD patients were treated by Mecobalamin combined with folic acid. Results There were obvious differences between two groups on the levels of plasma homocysteine, folic acid and VitB12(P 0.05). Conclusion The plasma Hcy levels in VD was significantly higher than that in healthy, folic acid and VitB12 level was lower, Mecobalamin combined with folic acid can apparently ease high Hcy hyperlipidemia status in patients.

  2. Total plasma proANP increases with atrial dilatation in horses.

    Science.gov (United States)

    Van Der Vekens, N; Hunter, I; Timm, A; Decloedt, A; De Clercq, D; Deprez, P; Goetze, J P; van Loon, G

    2015-12-19

    Equine atrial natriuretic peptide (ANP) plasma concentrations are correlated with left atrial size. However, species-specific assays are lacking and the results from human assays are poorly reproducible. A new methodology called processing independent analysis (PIA) that measures the total proANP product in plasma has proven to be successful in human medicine, but has never been used in horses. The aims were to establish an equine proANP reference interval by measurement of the total proANP product using PIA and to examine the proANP concentrations in horses with atrial dilatation. Sample stability was studied by comparison of storage at -80°C and -20°C. Plasma samples were obtained from 23 healthy horses, 12 horses with moderate or severe valvular regurgitation without atrial dilatation and 42 horses with valvular regurgitation and atrial dilatation. The proANP concentration was significantly (Phorses with atrial dilatation (761.4 (442.1-1859.1) pmol/l) than in healthy horses (491.6 (429.5-765.9) pmol/l; Phorses with cardiac disease but without atrial dilatation (544.4 (457.0-677.6) pmol/l). A cut-off value (573.8 pmol/l) for detection of atrial dilatation was calculated. Sample storage at -80°C did not differ from sample storage at -20°C. The measurement of total proANP in plasma detects atrial dilatation in horses and may be useful for clinical evaluation in equine medicine.

  3. Homocysteine and its thiolactone impair plasmin activity induced by urokinase or streptokinase in vitro.

    Science.gov (United States)

    Kolodziejczyk-Czepas, Joanna; Talar, Beata; Nowak, Pawel; Olas, Beata; Wachowicz, Barbara

    2012-04-01

    Mechanisms of homocysteine (Hcy) contribution to thrombosis are complex and only partly recognized. The available data suggest that the prothrombotic activity of homocysteine may be not only a result of the changes in coagulation process and endothelial dysfunction, but also the dysfunction of fibrinolysis. The aim of the present work was to assess the effects of homocysteine (10-100 μM mM) and its thiolactone (HTL, 0.1-1 μM) on plasminogen and plasmin functions in vitro. The amidolytic activity of generated plasmin in Hcy or HTL-treated plasminogen and plasma samples was measured by the hydrolysis of chromogenic substrate. Effects of Hcy and HTL on proteolytic activity of plasmin were monitored electrophoretically, by using of fibrinogen as a substrate. The exposure of human plasma and purified plasminogen to Hcy or HTL resulted in the decrease of urokinase-induced plasmin activity. In plasminogen samples treated with the highest concentration of homocysteine (100 μM) or thiolactone (1 μM), the activity of plasmin was inhibited by about 50%. In plasma samples, a reduction of amidolytic activity by about 30% (for 100 μM Hcy) and 40% (for 1 μM HTL), was observed. Both Hcy and HTL were also able to diminish the streptokinase-induced proteolytic activity of plasmin. In conclusion, the results obtained in this study demonstrate that Hcy and HTL may affect fibrinolytic properties of plasminogen and plasma, leading to the decrease of plasmin activity.

  4. Determination of total plasma hydroperoxides using a diphenyl-1-pyrenylphosphine fluorescent probe.

    Science.gov (United States)

    Santas, Jonathan; Guardiola, Francesc; Rafecas, Magda; Bou, Ricard

    2013-03-01

    Plasma hydroperoxides (HPs) are widely accepted to be good indicators of oxidative stress. By means of the method proposed here, which uses diphenyl-1-pyrenylphosphine (DPPP) as a fluorescent probe, all types of plasma HP were determined. The limits of detection and quantification of the method were 0.08 and 0.25 nmol of cumene hydroperoxide (CHP) equivalents in 40 μl of plasma, respectively. The method is satisfactory in terms of precision (5.3% for 14.5 μM CHP eq., n=8), and the recoveries were 91% and 92% after standard additions of 26 and 52 μM CHP, respectively. The selectivity of the proposed method is higher than 96%. Moreover, optimization of the reaction conditions and the addition of ethylenediaminetetraacetic acid (EDTA) disodium salt and 2,6-di-tert-butyl-4-methylphenol (BHT) prevented the formation of HP artifacts during the analysis. Therefore, the proposed method is useful for simple and quantitative determination of total plasma HPs.

  5. Homocysteine, Cortisol, Diabetes Mellitus, and Psychopathology

    Science.gov (United States)

    Kontoangelos, K.; Papageorgiou, C. C.; Raptis, A. E.; Tsiotra, P.; Lambadiari, V.; Papadimitriou, G. N.; Rabavilas, A. D.; Dimitriadis, G.; Raptis, S. A.

    2015-01-01

    Objective. This study investigates the association of homocysteine and cortisol with psychological factors in type 2 diabetic patients. Method. Homocysteine, cortisol, and psychological variables were analyzed from 131 diabetic patients. Psychological factors were assessed with the Eysenck Personality Questionnaire (EPQ), Hostility and Direction of Hostility Questionnaire (HDHQ), the Symptom Checklist 90-R (SCL 90-R), the Zung Self-Rating Depression Scale (ZDRS), and the Maudsley O-C Inventory Questionnaire (MOCI). Blood samples were taken by measuring homocysteine and cortisol in both subgroups during the initial phase of the study (T0). One year later (T1), the uncontrolled diabetic patients were reevaluated with the use of the same psychometric instruments and with an identical blood analysis. Results. The relation of psychoticism and homocysteine is positive among controlled diabetic patients (P value = 0.006 diabetic patients showed a statistically significant negative relationship between homocysteine and the act-out hostility subscale (r sp = −0.247, P = 0.023). There is a statistically significant relationship between homocysteine and somatization (r sp = −0.220, P = 0.043). Conclusions. These findings support the notion that homocysteine and cortisol are related to trait and state psychological factors in patients with diabetes mellitus type 2. PMID:25722989

  6. Homocysteine, Cortisol, Diabetes Mellitus, and Psychopathology

    Directory of Open Access Journals (Sweden)

    K. Kontoangelos

    2015-01-01

    Full Text Available Objective. This study investigates the association of homocysteine and cortisol with psychological factors in type 2 diabetic patients. Method. Homocysteine, cortisol, and psychological variables were analyzed from 131 diabetic patients. Psychological factors were assessed with the Eysenck Personality Questionnaire (EPQ, Hostility and Direction of Hostility Questionnaire (HDHQ, the Symptom Checklist 90-R (SCL 90-R, the Zung Self-Rating Depression Scale (ZDRS, and the Maudsley O-C Inventory Questionnaire (MOCI. Blood samples were taken by measuring homocysteine and cortisol in both subgroups during the initial phase of the study (T0. One year later (T1, the uncontrolled diabetic patients were reevaluated with the use of the same psychometric instruments and with an identical blood analysis. Results. The relation of psychoticism and homocysteine is positive among controlled diabetic patients (P value = 0.006<0.05 and negative among uncontrolled ones (P value = 0.137. Higher values of cortisol correspond to lower scores on extraversion subscale (rp=-0.223, P value = 0.010. Controlled diabetic patients showed a statistically significant negative relationship between homocysteine and the act-out hostility subscale (rsp=-0.247, P=0.023. There is a statistically significant relationship between homocysteine and somatization (rsp=-0.220, P=0.043. Conclusions. These findings support the notion that homocysteine and cortisol are related to trait and state psychological factors in patients with diabetes mellitus type 2.

  7. Acute Exercise Increases Plasma Total Antioxidant Status and Antioxidant Enzyme Activities in Untrained Men

    Directory of Open Access Journals (Sweden)

    C. Berzosa

    2011-01-01

    Full Text Available Antioxidant defences are essential for cellular redox regulation. Since free-radical production may be enhanced by physical activity, herein, we evaluated the effect of acute exercise on total antioxidant status (TAS and the plasma activities of catalase, glutathione reductase, glutathione peroxidase, and superoxide dismutase and its possible relation to oxidative stress resulting from exercise. Healthy untrained male subjects (=34 performed three cycloergometric tests, including maximal and submaximal episodes. Venous blood samples were collected before and immediately after each different exercise. TAS and enzyme activities were assessed by spectrophotometry. An increase of the antioxidant enzyme activities in plasma was detected after both maximal and submaximal exercise periods. Moreover, under our experimental conditions, exercise also led to an augmentation of TAS levels. These findings are consistent with the idea that acute exercise may play a beneficial role because of its ability to increase antioxidant defense mechanisms through a redox sensitive pathway.

  8. Seminal plasma total antioxidant capacity and vitamin- C levels in asthenozoospermia: a case- control study

    Directory of Open Access Journals (Sweden)

    Ali Bidmeshkipour

    2010-03-01

    Full Text Available "n Normal 0 false false false EN-US X-NONE AR-SA MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:Arial; mso-bidi-theme-font:minor-bidi;} Background: Defective sperm function is now recognized as one of the most important causes of male infertility. Seminal plasma possesses a rich source of different enzymatic and non-enzymatic antioxidants such as vitamin C (ascorbic acid that protect spermatozoa against oxidative stress as one of the mediators of infertility causing sperm dysfunction and low sperm quality. The aim of this study was investigation of seminal total antioxidant capacity and determination of vitamin C effects on sperm motility. "n"nMethods: We designed a case-control study with a total subject of 62 males. Sperm parameters were analyzed according to World Health Organization guidelines (WHO, 1999. Total antioxidant capacity and vitamin C level of seminal plasma were measured in the 32 normozoospermic as the control group and 32 asthenospermic men as the case group using FRAP (Ferric Reducing of Antioxidants Powers and RP-HPLC (Reverse Phase High Performance Liquid Chromatography methods, respectively. "n"nResults: Our results indicated that total antioxidant capacity levels in the seminal plasma of asthenospermic men were significantly lower than healthy men (p=0.002. In addition, we found a positive correlation between reduced total

  9. Spectrophotometric determination of total proteins in blood plasma: a comparative study among dye-binding methods

    Directory of Open Access Journals (Sweden)

    Dimas Augusto Morozin Zaia

    2005-05-01

    Full Text Available A comparative study between the biuret method (standard method for total proteins and spectrophotometric methods using dyes (Bradford, 3',3",5',5"-tetrabromophenolphthalein ethyl ester-TBPEE, and erythrosin-B was carried out for the determination of total proteins in blood plasma from rats. Bradford method showed the highest sensitivity for proteins and biuret method showed the lowest. For all the methods, the absorbance for different proteins (BSA, casein, and egg albumin was measured and Bradford method showed the lowest variation of absorbance. The concentration of total protein obtained by using Bradford method was not statistically different (p>0.05 from concentration of total protein obtained by the biuret method. But in regard to erythrosin-B and TBPEE methods the concentrations of total protein were statistically different (pA determinação de proteínas totais em plasma sangüíneo é importante em diversas áreas de pesquisa. Um estudo comparativo entre o método de biureto (método padrão para proteínas totais e diversos métodos que utilizam corantes (Bradford, tetrabromofenolftaleína etil éster-TBPEE, e eritrosina-B foi realizado para a determinação de proteínas totais em plasma sangüíneo de ratos. O método de Bradford mostrou a maior sensibilidade para proteínas e o de biureto a menor. Para todos os métodos, as absorbâncias para diferentes proteínas (BSA, caseína, e ovoalbumina foram medidas e o método de Bradford mostrou a menor variação da absorbância. Utilizando o método de Bradford a concentração de proteínas totais obtida não foi estatisticamente diferente (p>0.05 daquela obtida pelo método do biureto. Porém, para os métodos da eritrosina-B e TBPEE as concentrações de proteínas totais foram estatisticamente diferentes (p<0.05 da obtida pelo método de biureto. Portanto o método de Bradford pode ser utilizado no lugar do método de biureto para a determinação de proteínas totais em plasma sangüíneo.

  10. Testing for homocysteine in clinical practice.

    Science.gov (United States)

    Nichols, John

    2017-03-01

    The theory that raised blood homocysteine is a major factor in the development of cardiovascular disease was initially rejected by the medical establishment. Trials of a treatment to lower homocysteine in moderately advanced disease have failed to show benefits (except in those not treated with anti-platelet drug), but there is mounting evidence for a role in treatment of very early disease and as a preventive strategy. Recent evidence has shown that lowering of high blood homocysteine significantly slows cognitive decline and the brain shrinkage associated with Alzheimer's disease. This is a test that should be done more frequently by National Health Service (NHS) general practitioners and private practitioners.

  11. Inlfuence of Depressive State on Levels of Homocysteine and Thyroid Hormone in Patients with Hypertension

    Institute of Scientific and Technical Information of China (English)

    WANG Wei-wei; WANG Yan-ling

    2015-01-01

    Objective: To explore the inlfuence of depressive state on the levels of homocysteine (Hcy) and thyroid hormone in patients with hypertension. Methods:Totally 179 patients with primary hypertension were selected and divided into depression group (n=97) and non-depression group (n=82) according to whether to be complicated with depressive disorder. The venous blood was drawn for detecting the level of Hcy in 2 groups by enzymatic cycling assay, and serum free triiodothyronine (FT3), free thyroxine (FT4) and thyrotropic hormone (TSH) by chemiluminiscence. The correlation between Hamilton depression scale (HAMD) scores and levels of plasma Hcy and serum FT3, FT4 and TSH was analyzed. Results: Compared with non-depression group, the level of plasma Hcy increased and the levels of FT3 and FT4 decreased in depression group (P0.05). HAMD scores in depression group had a positive correlation with the level of plasma Hcy (r=0.593,P=0.024), a negative correlation with the level of serum FT3 (r=-0.421,P=0.011), and no relationships with the levels of serum FT4 and TSH (r=-0.137,P=0.334;r=0.058, P=0.576). Conclusion: Hypertensive patients complicated with depression have abnormal level of Hcy and thyroid hormones. Moreover, the depressive degree of patients is positively correlated with the level of Hcy and negatively with the level of FT3.

  12. [Determination of total sulfur in coal by inductively coupled plasma atomic emission spectrometry].

    Science.gov (United States)

    Liu, Dong-yan; Zhang, Yuan-li

    2002-02-01

    A direct method was reported for the determination of total sulfur in coal by inductively coupled plasma atomic emission spectrometry (ICP-AES). The dissolution conditions of coal samples as well as interference conditions of hydrochloric acid and matrix were studied. The recommended method not only proved to be simple and rapid than traditional gravimetric method but show satisfying precision and accuracy as well. The results of samples are as same as gravimetry. The recoveries are more than 96%, and the relative standard deviation of six samples are less than 3%.

  13. B 族维生素干预后血清同型半胱氨酸水平对早期反复流产患者保胎效果的影响%The effect of plasma homocystein levels after vitamin B intervention on patients with early recurrent spontaneous abortion

    Institute of Scientific and Technical Information of China (English)

    杜艳; 王金兰

    2014-01-01

    目的:探讨B族维生素干预后血清同型半胱氨酸水平对早期反复流产患者保胎效果的影响。方法排除导致自然流产其它因素,选择血清同型半胱氨酸水平在10μmol/L及以上的患者80例,随机分为两组,治疗组40例孕前给予B族维生素治疗1月后复查血清同型半胱氨酸水平并继续服用上述药物至妊娠12周;对照组40例孕前后均不予上述药物治疗。孕后两组均常规保胎观察至妊娠12周,行B超检查证实活胎并胎儿发育正常者为保胎成功。结果治疗组服用B族维生素1月后血清同型半胱氨酸水平平均下降44%,妊娠36例,保胎成功30例,保胎成功率83%;对照组妊娠32例,保胎成功18例,保胎成功率56%。结论对于早期反复流产患者,B族维生素可有效降低血清同型半胱氨酸水平,并可有效提高保胎成功率。%Objective To investigate the effect of plasma homocystein levels after vitamin B intervention on patients with ear‐ly recurrent spontaneous abortion .Methods 80 patients of Plasma homocystein level ≥10μmol/L with early recurrent sponta‐neous abortion excluding other factors were selected .They were divided into a treatment group (n=40) which took Plasma ho‐mocystein level after taking vitamin B one month before prognancy then continued to take them till 12 th week of pregnancy and a control group(n=40) which took no medicine before and after pregnancy .Two groups were routine tocolysis for up to 12 weeks after pregnancy .The normal fetal development was considered successful tocolysis after B‐ultrasonography examination . Results Homocystein levels in treatment group dropped by an average of 44% after taking vitamin B one month .Tocolysis suc‐cessful rate was 83% in 36 cases of pregnancy ,which was different from that in 32 cases of pregnancy of the control group (56% ) .Conclusion Vitamin B could reduce homocystein levels of patients with early recurrent

  14. Homocisteína Homocysteine

    Directory of Open Access Journals (Sweden)

    Lindalva Batista Neves

    2004-10-01

    Full Text Available A homocisteína, formada a partir da metionina hepática, é metabolizada nas vias de desmetilação e de transulfuração, sendo que seus valores plasmáticos e urinários refletem a síntese celular. Sua determinação, realizada em jejum e após sobrecarga de metionina, caracteriza as diferenças dessas vias metabólicas, principalmente quando de natureza genética. A hiper-homocisteinemia tem sido associada a maior risco de eventos aterotrombóticos, e a literatura sugere associação causal, independente de outros fatores de risco para doença arterial. Diminuição da homocisteína plasmática para valores normais é seguida de redução significante na incidência de doença aterotrombótica. A relação entre homocisteína e o fígado vem adquirindo importância nos dias atuais, uma vez que alterações das lipoproteínas e da depuração de metionina são comuns em pacientes com doença hepática crônica (hepatocelular e canalicular. O tratamento da hiper-homocisteinemia fundamenta-se na suplementação alimentar e medicamentosa de ácido fólico e vitaminas B6 e B12.Homocysteine, formed from hepatic methionine, is metabolized through the pathways of demethylation and transsulfuration. Its plasmatic and urinary values reflect the cell synthesis. Its determination after fasting and increased infusion of methionine shows the differences of these two metabolic pathways, mainly when it is related to genetic diseases. Hyperhomocysteinemia has been associated with a higher risk of vascular thrombotic events. Several authors suggest a causal relationship between these events independently of other risk factors for vascular diseases. Decrease in plasmatic homocysteine to normal levels is followed by a significant reduction on the incidence of vascular thrombotic events. The correlation between the liver and homocysteine is becoming more important because of the recent findings that alterations of lipoproteins and methionine clearance are

  15. Seasonal foraging patterns of forest-grazing Japanese Black heifers with increased plasma total antioxidant capacity.

    Science.gov (United States)

    Haga, Satoshi; Nakano, Miwa; Nakao, Seiji; Hirano, Kiyoshi; Yamamoto, Yoshito; Sasaki, Hiroyuki; Ishizaki, Hiroshi

    2016-02-01

    Forest-grazing enables the intake of high total antioxidant capacity (TAC) plants that might be beneficial for the TAC status of cattle. This study evaluated the relation between the seasonal foraging patterns of forest-grazing Japanese Black (JB) heifers or the TAC levels in shrubs and trees and the changes of plasma TAC. We examined 12 JB heifers, four each of which were allocated to forest-grazing (F), pasture-grazing, and pen-housed groups. The plasma TAC level in F heifers on July 26, August 13, 30 and September 17 were significantly higher than those on April 27 and June 4 (P < 0.05). In F group, the mean rates of foraging frequency (FF) of shrubs and trees during July 5-8 and September 13-16 were much higher than that during May 31-June 3 (P < 0.05). The rate of FF of grass significantly decreased later in the season (P < 0.05). The mean TAC levels in these shrubs and trees were higher than those in grasses, concentrates, and timothy hay. Results suggest that an important factor in the increase of plasma TAC in forest-grazing cattle might be the increased foraging of TAC-rich shrubs and trees during summer-fall.

  16. Correlation of serum homocysteine metabolism and oxidative stress level with peripheral nerve damage in patients with Parkinson's disease

    Institute of Scientific and Technical Information of China (English)

    Wei-Xia Gu; Zhi-Qing Zhuang; Mo-Lan Wang; Jun Zhu

    2016-01-01

    Objective:To analyze the correlation of serum homocysteine metabolism and oxidative stress level with peripheral nerve damage in patients with Parkinson's disease.Methods:A total of 58 patients with Parkinson's disease and 67 normal human beings were included in the study, levels of plasma homocysteine (Hcy) as well as superoxide dismutase (SOD), GSH, malondialdehyde (MDA) and other oxidative stress indexes were detected, and common peroneal nerve motor conduction velocity (MCV), latent period (LP) and amplitude (Amp) were determined.Results: Serum Hcy level of observation group was higher than that of control group while folic acid and vitamin B6 levels were lower than those of control group; serum oxidative indexes LHP, H2O2, AOPP and MDA levels were higher than those of control group while antioxidant indexes SOD T, SOD Mn, SOD Cu-Zn, GSH-PX, T-AOC and CAT levels were lower than those of control group; common peroneal nerve MCV and Amp values were lower than those of control group while LP value was higher than that of control group. Peripheral nerve damage parameter values in patients with Parkinson's disease were directly correlated with serum levels of Hcy metabolism indexes and oxidative stress indexes. Conclusions: Peripheral nerve damage in patients with Parkinson's disease is associated with hyperhomocysteinemia and oxidative stress disorder, and intervention in serum levels of Hcy and oxidative stress indexes is expected to become a new way for treatment of Parkinson's disease.

  17. Serial changes in plasma total cortisol, plasma free cortisol, and tissue cortisol activity in patients with septic shock: an observational study

    National Research Council Canada - National Science Library

    Cohen, Jeremy; Smith, Melissa Lassig; Deans, Renae V; Pretorius, Carel J; Ungerer, Jacobus P J; Tan, Terrence; Jones, Mark; Venkatesh, Bala

    2012-01-01

    Published data on adrenocortical function in septic shock have enrolled patients at various stages of critical illness and predominantly used plasma total cortisol, with minimal information on serial changes...

  18. Plasma free and total carnitine measured in children by tandem mass spectrometry.

    Science.gov (United States)

    Osorio, J H; Pourfarzam, M

    2002-11-01

    Free and total carnitine quantification is important as a complementary test for the diagnosis of unusual metabolic diseases, including fatty acid degradation disorders. The present study reports a new method for the quantification of free and total carnitine in dried plasma specimens by isotope dilution electrospray tandem mass spectrometry with sample derivatization. Carnitine is determined by looking for the precursor of ions of m/z = 103 of N-butylester derivative, and the method is validated by comparison with radioenzymatic assay. We obtained an inter- and intra-day assay coefficient of variation of 4.3 and 2.3, respectively. Free and total carnitine was analyzed in 309 dried plasma spot samples from children ranging in age from newborn to 14 years using the new method, which was found to be suitable for calculating reference age-related values for free and total carnitine (less than one month: 19.3 +/- 2.4 and 23.5 +/- 2.9; one to twelve months: 28.8 +/- 10.2 and 35.9 +/- 11.4; one to seven years: 30.7 +/- 10.3 and 38.1 +/- 11.9; seven to 14 years: 33.7 +/- 11.6, and 43.1 +/- 13.8 micro M, respectively). No difference was found between males and females. A significant difference was observed between neonates and the other age groups. We compare our data with reference values in the literature, most of them obtained by radioenzymatic assay. However, this method is laborious and time consuming. The electrospray tandem mass spectrometry method presented here is a reliable, rapid and automated procedure for carnitine quantitation.

  19. Plasma free and total carnitine measured in children by tandem mass spectrometry

    Directory of Open Access Journals (Sweden)

    J.H. Osorio

    2002-11-01

    Full Text Available Free and total carnitine quantification is important as a complementary test for the diagnosis of unusual metabolic diseases, including fatty acid degradation disorders. The present study reports a new method for the quantification of free and total carnitine in dried plasma specimens by isotope dilution electrospray tandem mass spectrometry with sample derivatization. Carnitine is determined by looking for the precursor of ions of m/z = 103 of N-butylester derivative, and the method is validated by comparison with radioenzymatic assay. We obtained an inter- and intra-day assay coefficient of variation of 4.3 and 2.3, respectively. Free and total carnitine was analyzed in 309 dried plasma spot samples from children ranging in age from newborn to 14 years using the new method, which was found to be suitable for calculating reference age-related values for free and total carnitine (less than one month: 19.3 ± 2.4 and 23.5 ± 2.9; one to twelve months: 28.8 ± 10.2 and 35.9 ± 11.4; one to seven years: 30.7 ± 10.3 and 38.1 ± 11.9; seven to 14 years: 33.7 ± 11.6, and 43.1 ± 13.8 µM, respectively. No difference was found between males and females. A significant difference was observed between neonates and the other age groups. We compare our data with reference values in the literature, most of them obtained by radioenzymatic assay. However, this method is laborious and time consuming. The electrospray tandem mass spectrometry method presented here is a reliable, rapid and automated procedure for carnitine quantitation.

  20. Total Extracellular Small RNA Profiles from Plasma, Saliva, and Urine of Healthy Subjects

    Science.gov (United States)

    Yeri, Ashish; Courtright, Amanda; Reiman, Rebecca; Carlson, Elizabeth; Beecroft, Taylor; Janss, Alex; Siniard, Ashley; Richholt, Ryan; Balak, Chris; Rozowsky, Joel; Kitchen, Robert; Hutchins, Elizabeth; Winarta, Joseph; McCoy, Roger; Anastasi, Matthew; Kim, Seungchan; Huentelman, Matthew; Van Keuren-Jensen, Kendall

    2017-01-01

    Interest in circulating RNAs for monitoring and diagnosing human health has grown significantly. There are few datasets describing baseline expression levels for total cell-free circulating RNA from healthy control subjects. In this study, total extracellular RNA (exRNA) was isolated and sequenced from 183 plasma samples, 204 urine samples and 46 saliva samples from 55 male college athletes ages 18–25 years. Many participants provided more than one sample, allowing us to investigate variability in an individual’s exRNA expression levels over time. Here we provide a systematic analysis of small exRNAs present in each biofluid, as well as an analysis of exogenous RNAs. The small RNA profile of each biofluid is distinct. We find that a large number of RNA fragments in plasma (63%) and urine (54%) have sequences that are assigned to YRNA and tRNA fragments respectively. Surprisingly, while many miRNAs can be detected, there are few miRNAs that are consistently detected in all samples from a single biofluid, and profiles of miRNA are different for each biofluid. Not unexpectedly, saliva samples have high levels of exogenous sequence that can be traced to bacteria. These data significantly contribute to the current number of sequenced exRNA samples from normal healthy individuals. PMID:28303895

  1. The relationship between associative learning, transfer generalization, and homocysteine levels in mild cognitive impairment.

    Science.gov (United States)

    Moustafa, Ahmed A; Hewedi, Doaa H; Eissa, Abeer M; Myers, Catherine E; Sadek, Hisham A

    2012-01-01

    Previous studies have shown that high total homocysteine levels are associated with Alzheimer's disease (AD) and mild cognitive impairment (MCI). In this study, we test the relationship between cognitive function and total homocysteine levels in healthy subjects (Global Dementia Rating, CDR = 0) and individuals with MCI (CDR = 0.5). We have used a cognitive task that tests learning and generalization of rules, processes that have been previously shown to rely on the integrity of the striatal and hippocampal regions, respectively. We found that total homocysteine levels are higher in MCI individuals than in healthy controls. Unlike what we expected, we found no difference between MCI subjects and healthy controls in learning and generalization. We conducted further analysis after diving MCI subjects in two groups, depending on their Global Deterioration Scale (GDS) scores: individuals with very mild cognitive decline (vMCD, GDS = 2) and mild cognitive decline (MCD, GDS = 3). There was no difference among the two MCI and healthy control groups in learning performance. However, we found that individuals with MCD make more generalization errors than healthy controls and individuals with vMCD. We found no difference in the number of generalization errors between healthy controls and MCI individuals with vMCD. In addition, interestingly, we found that total homocysteine levels correlate positively with generalization errors, but not with learning errors. Our results are in agreement with prior results showing a link between hippocampal function, generalization performance, and total homocysteine levels. Importantly, our study is perhaps among the first to test the relationship between learning (and generalization) of rules and homocysteine levels in healthy controls and individuals with MCI.

  2. Homocystein und Hyperhomocysteinämie

    Directory of Open Access Journals (Sweden)

    Kiefer I

    2001-01-01

    Full Text Available Homocystein ist ein Intermediärprodukt im Stoffwechsel schwefelhältiger Aminosäuren. Im gesunden Organismus wird Homocystein innerhalb von kurzer Zeit wieder zu Methionin remethyliert oder über Cystathionin und Cystein zu Glutathion weiter verstoffwechselt. Als Coenzyme werden die Vitamine B6 und B12 und als Methylgruppendonator die Folsäure benötigt. Homocystein ist ein unabhängiger Risikofaktor für eine Reihe von Erkrankungen wie beispielsweise Atherosklerose oder arterielle und venöse Thrombosen. Gesamtplasmaspiegel von 10 µmol/l stellen bereits ein Risiko für Begleit- und Folgekrankheiten dar. Jede Erhöhung des Plasmahomocysteinspiegels um bis zu 5 µmol/l erhöht das kardiovaskuläre Risiko zwischen 32 % und 60 % und entspricht einer Cholesterinerhöhung von 20 mg/dl. Schätzungen gehen davon aus, daß bis zu 7 % der Bevölkerung eine Homocysteinämie aufweisen, wovon zwei Drittel der Fälle wahrscheinlich auf eine unzureichende Plasmakonzentration der am Homocystein-Metabolismus beteiligten Vitamine (Folsäure, Vitamin B6 und Vitamin B12 zurückzuführen ist. Ziel muß es künftig sein, das Homocystein-Bewußtsein, sowohl in der Bevölkerung als auch bei den Ärzten zu erhöhen.

  3. Plasmas pour valorisation totale ou partielle des gaz contenant de l'H2S Plasmas for Total Or Partial Upgrading of H2s Containing Gases

    Directory of Open Access Journals (Sweden)

    Czernichowski A.

    2006-12-01

    Full Text Available Des procédés par plasmas alternatifs au procédé Claus sont proposés pour produire de l'hydrogène et récupérer du soufre à partir des gaz contenant une forte teneur en H2S. Quand la teneur en H2S est moins importante, des techniques plasma peuvent également être utiles pour assister certains étages du procédé classique Claus ou réaliser ce procédé pour des gaz non conventionnels. Les tests allant jusqu'à l'échelle industrielle sont menés dans divers réacteurs à plasmas et les résultats encourageants rapportés de la littérature et de la recherche propre laissent envisager des prochaines applications. Plasma assisted processes are proposed to act as an alternative to the Claus process in order to recover hydrogen and sulphur from high H2S gases. For less concentrated gases plasma techniques may also be inserted into classical Claus plant or may allow treatment of non conventional gases. Up to industrial scale tests are performed using different plasma reactors. The literature-based results as well as our own ones make the future applications quite optimistic.

  4. A prospective study on the association of plasma homocysteine level with stroke in hypertensive patients%高血压患者同型半胱氨酸与卒中关系的前瞻性研究

    Institute of Scientific and Technical Information of China (English)

    马剑平; 陈忠伟; 陈思韩; 彭晓琳; 刘盛元; 赵丹; 韩丽媛; 王长义

    2015-01-01

    目的 揭示高血压患者同型半胱氨酸(Hcy)与卒中的关系.方法 采用前瞻性队列研究设计,对深圳市南山区60个社区的5 488例高血压患者进行基线调查和平均2.7年随访.Hcy采用循环酶法检测,卒中包括ICD-10编码中I60-I64的类型,根据患者的院前症状、头颅CT、头颅MRI、脑血管造影和经颅多普勒超声等检查结果进行确诊.结果 5 488例高血压人群327例失访,失访率5.96%,新发卒中患者197例,累积发病率3.82%.在矫正年龄、性别、教育、吸烟、饮酒、BMI、体育锻炼、糖尿病、抑郁、卒中家族史、患病年限、降压药、叶酸、收缩压、TC、血糖和TG后,Hcy最高四分位数(Q4)与最低四分位数(Q1)相比,Hcy引发卒中的HR为7.4(3.2 ~13.2),其中男性7.5(3.0 ~19.5),女性7.7(2.7 ~22.1).Hcy每增加5μmol/L引发卒中的HR为1.15(1.09 ~1.21),其中男性和女性分别为1.15(1.08~1.21)和1.19(1.04~1.35);未发现Hcy与心脑血管疾病传统危险因素对卒中具有交互作用.结论 高血压患者中Hcy水平和卒中可能具有正相关的关系.%Objective To analyze the association between homocysteine (Hcy) and stroke in hypertensive patients.Methods This was a prospective cohort study conducted in 60 communities in Nanshan District,Shenzhen.Totally 5 488 patients with hypertension were included at baseline survey and followed for an average of 2.7 years.At the end of follow-up,327 (5.96%) subjects were missing with unknown reasons.Hcy was detected by enzymatic cycling method.Head CT,MRI,cerebral angiography and transcranial Doppler ultrasound were performed in the patients.Stroke was defined based on the International Classification of Diseases (ICD10 coding I60-I64).Results After an average of 2.7-year follow-up,197 developed new stroke.The incidence rate was 3.82%.Subjects whose Hcy levels were within the highest quartile (Q4) had higher risk to develop stroke compared with those whose Hey levels

  5. What is the influence of hormone therapy on homocysteine and crp levels in postmenopausal women?

    Directory of Open Access Journals (Sweden)

    Eli Marcelo Lakryc

    2015-02-01

    Full Text Available OBJECTIVE: To evaluate the influence of estrogen therapy and estrogen-progestin therapy on homocysteine and C-reactive protein levels in postmenopausal women. METHODS: In total, 99 postmenopausal women were included in this double-blind, randomized clinical trial and divided into three groups: Group A used estrogen therapy alone (2.0 mg of 17β-estradiol, Group B received estrogen-progestin therapy (2.0 mg of 17 β-estradiol +1.0 mg of norethisterone acetate and Group C received a placebo (control. The length of treatment was six months. Serum measurements of homocysteine and C-reactive protein were carried out prior to the onset of treatment and following six months of therapy. RESULTS: After six months of treatment, there was a 20.7% reduction in homocysteine levels and a 100.5% increase in C-reactive protein levels in the group of women who used estrogen therapy. With respect to the estrogen-progestin group, there was a 12.2% decrease in homocysteine levels and a 93.5% increase in C-reactive protein levels. CONCLUSION: Our data suggested that hormone therapy (unopposed estrogen or estrogen associated with progestin may have a positive influence on decreasing cardiovascular risk due to a significant reduction in homocysteine levels.

  6. The effect of homocysteine reduction by B-vitamin supplementation on markers of endothelial dysfunction.

    Science.gov (United States)

    Peeters, Anita C T M; van der Molen, Els F; Blom, Henk J; den Heijer, Martin

    2004-11-01

    Hyperhomocysteinemia is a risk factor for arterial vascular disease and venous thrombosis. The pathophysiology of this relation is unclear, but several studies suggest that hyperhomocysteinemia impairs endothelial function. We examined the effect of homocysteine lowering by B-vitamin supplementation on tissue plasminogen activator (tPA), plasminogen activator inhibitor type 1 (PAI) and von Willebrand factor (vWf)--markers of endothelial dysfunction--in hyperhomocysteinemic and normohomocysteinemic volunteers. A total of 123 healthy volunteers were randomized to placebo or B-vitamins (5 mg folic acid, 0.4 mg hydroxycobalamin and 50 mg pyridoxine) daily for 8 weeks. Before and after the intervention period, blood samples were taken for measurements of homocysteine, tPA, PAI and vWf. There was no evident association between homocysteine concentration and concentrations of markers of endothelial dysfunction at baseline. The mean reduction of homocysteine concentration was 31% (95%CI 22.7 to 39.1) in the B-vitamin group compared to 3% reduction in the placebo group. Concentrations of tPA, PAI and vWf did not change after supplementation of B-vitamins. In conclusion, the results of our study show that homocysteine reduction by B-vitamin supplementation has no effect on markers of endothelial dysfunction in healthy volunteers.

  7. The Analysis of Asymetric Dimethylarginine and Homocysteine in Patients with Chronic Kidney Disease

    Directory of Open Access Journals (Sweden)

    Tetty Hendrawati

    2009-08-01

    Full Text Available BACKGROUND: Asymmetric dimethylarginine (ADMA is a competitive inhibitor of nitric oxide synthase (NOS. ADMA reduces NO synthesis when its concentration elevates. ADMA is a novel risk factor for cardiovascular disease. Plasma ADMA accumulates in patients with endstage renal disease, due to reduced renal clearance. Hyperhomocysteinemia is often found in patients with chronic kidney disease (CKD. Homocysteine may cause ADMA to accumulate; however, the mechanism by which ADMA level elevates in hyperhomocysteinemia is still unclear. Objective of this study was to analyze the concentrations of homocysteine and ADMA and to assess the correlation between homocysteine and ADMA concentrations with the severity of chronic kidney disease. METHODS: This was a cross-sectional study on 75 patients with CKD, comprising men and women aged 40-70 years. Assessments were done on the concentrations of creatinine, homocysteine, ADMA, fasting blood glucose, cholesterol HDL and triglyceride. RESULTS: In later stage of CKD there was significantly higher tHcy concentration as compared with the earlier stage of CKD (p=0.0000. In CKD stage 2 to 4 there was a tendency for ADMA concentration to increase to a significant average (p=0.210, but ADMA concentration was lower at stage 5. There was increased ADMA along with increased tHcy concentration of around 20μ mol/L, and this then decreased. The inverse correlation between tHcy and ADMA concentrations started to appear in CKD stage 4, but this correlation was statistically insignificant (r2=0.19; p=0.499. CONCLUSIONS: This study showed there was a correlation between homocysteine and ADMA concentrations in patients with CKD stage 2 to 5, although statistically not significant. KEYWORDS: asymmetric dimethylarginine, homocysteine, chronic kidney disease.

  8. The Metabolic Burden of Methyl Donor Deficiency with Focus on the Betaine Homocysteine Methyltransferase Pathway

    Directory of Open Access Journals (Sweden)

    Rima Obeid

    2013-09-01

    Full Text Available Methyl groups are important for numerous cellular functions such as DNA methylation, phosphatidylcholine synthesis, and protein synthesis. The methyl group can directly be delivered by dietary methyl donors, including methionine, folate, betaine, and choline. The liver and the muscles appear to be the major organs for methyl group metabolism. Choline can be synthesized from phosphatidylcholine via the cytidine-diphosphate (CDP pathway. Low dietary choline loweres methionine formation and causes a marked increase in S-adenosylmethionine utilization in the liver. The link between choline, betaine, and energy metabolism in humans indicates novel functions for these nutrients. This function appears to goes beyond the role of the nutrients in gene methylation and epigenetic control. Studies that simulated methyl-deficient diets reported disturbances in energy metabolism and protein synthesis in the liver, fatty liver, or muscle disorders. Changes in plasma concentrations of total homocysteine (tHcy reflect one aspect of the metabolic consequences of methyl group deficiency or nutrient supplementations. Folic acid supplementation spares betaine as a methyl donor. Betaine is a significant determinant of plasma tHcy, particularly in case of folate deficiency, methionine load, or alcohol consumption. Betaine supplementation has a lowering effect on post-methionine load tHcy. Hypomethylation and tHcy elevation can be attenuated when choline or betaine is available.

  9. The metabolic burden of methyl donor deficiency with focus on the betaine homocysteine methyltransferase pathway.

    Science.gov (United States)

    Obeid, Rima

    2013-09-09

    Methyl groups are important for numerous cellular functions such as DNA methylation, phosphatidylcholine synthesis, and protein synthesis. The methyl group can directly be delivered by dietary methyl donors, including methionine, folate, betaine, and choline. The liver and the muscles appear to be the major organs for methyl group metabolism. Choline can be synthesized from phosphatidylcholine via the cytidine-diphosphate (CDP) pathway. Low dietary choline loweres methionine formation and causes a marked increase in S-adenosylmethionine utilization in the liver. The link between choline, betaine, and energy metabolism in humans indicates novel functions for these nutrients. This function appears to goes beyond the role of the nutrients in gene methylation and epigenetic control. Studies that simulated methyl-deficient diets reported disturbances in energy metabolism and protein synthesis in the liver, fatty liver, or muscle disorders. Changes in plasma concentrations of total homocysteine (tHcy) reflect one aspect of the metabolic consequences of methyl group deficiency or nutrient supplementations. Folic acid supplementation spares betaine as a methyl donor. Betaine is a significant determinant of plasma tHcy, particularly in case of folate deficiency, methionine load, or alcohol consumption. Betaine supplementation has a lowering effect on post-methionine load tHcy. Hypomethylation and tHcy elevation can be attenuated when choline or betaine is available.

  10. Vitamin B12, folate, and homocysteine levels in patients with obsessive–compulsive disorder

    Directory of Open Access Journals (Sweden)

    Türksoy N

    2014-09-01

    , and Hamilton Rating Scale for Anxiety were conducted for each patient. It was found that vitamin B12 levels were decreased and homocysteine levels were increased in some OCD patients. Homocysteine levels were positively correlated with Yale–Brown compulsion and Yale–Brown total scores. In conclusion, findings of this study suggest that some OCD patients might have vitamin B12 deficiency and higher homocysteine levels. Keywords: obsessive–compulsive disorder, vitamin B12, folate, homocysteine, obsession, compulsion

  11. STATUS HOMOCYSTEINE DAN ASAM FOLAT PADA IBU HAMIL MEREKA

    OpenAIRE

    Dewi Permaesih; Yuniar Rosmalina; Reviana Christijani; Muhilal Muhilal

    2012-01-01

    HOMOCYSTEINE AND FOLIC ACID STATUS OF ANEMIC PREGNANT WOMEN.Background: Folic acid deficiency among pregnant women in Indonesia is quite prevalent. It is believed to cause the anemia and the risk of infant neutral tube defect. Folic acid plays a certain role in homocysteine convertion into methionine. Serum homocysteine will increase with the decrease folic acid.Objective: To obtain folic acid consumption, homocysteine and folic acid status in pregnant women suffering from anemia using recent...

  12. The Relationship Between Plasma Homocysteine and Pulse Wave Velocity in a Community-Based Healthy Subject Group%社区健康人群血浆同型半胱氨酸水平与脉搏波速度的相关性研究

    Institute of Scientific and Technical Information of China (English)

    张明华; 叶平; 骆雷鸣; 肖文凯; 吴红梅; 刘德军; 刘国树

    2013-01-01

    目的:研究血浆同型半胱氨酸(Hcy)水平与不同动脉节段脉搏波速度(PWV)之间的关系.方法:一项北京市海淀区社区调查研究的亚组人群,常规体检健康者250例,男112例,女138例,平均年龄(54.7±12.9)岁.血浆Hcy、血糖、血脂、尿酸等血液生化指标采用全自动生化分析仪检测.应用自动分析仪(Complior)测定颈-股动脉脉搏波传导速度(CF-PWV)、颈-桡动脉脉搏波传导速度(CR-PWV)以及颈-踝动脉脉搏波传导速度(CA-PWV).入选者以血浆Hcy≥15 μmol/L为标准,分为高Hcy组(n=122 )和正常对照组(n= 128).结果:与正常对照组比较,高Hcy组年龄(P=0.001)、肌酐(P=0.003) 、尿酸(P<0.001)、CF-PWV(P=0.008)、CR-PWV(P=0.008)和CA-PWV(P<0.001) 均增高;肾小球滤过率降低(P<0.001).多因素逐步回归分析显示:Lg(CF-PWV)的独立相关因素是年龄(β=0.148,P=0.032)、脉压(β=0.168,P=0.013)和高Hcy血症(β=0.137,P=0.029).CR-PWV的独立相关因素是血尿酸(β=0.171,P=0.007).CA-PWV的独立相关因素是高Hcy血症(β=0.247,P<0.001)和收缩压(β=0.219,P<0.001).结论:在健康人群中,Hcy水平与动脉僵硬度相关.%Objective: To investigate the relationship between plasma homocysteine (Hcy) and pulse wave velocity (PWV) in a community-based healthy subject group. Methods: A total of 250 heathy subjects were selected from a community-based routine physical check-up in Haidian District, Beijing. There were 112 male and 138 female with the mean age of (54.7 ± 12.9) years. The recruited subjects were divided into 2 groups, High Hcy group, n=122, the subjects with plasma Hcy ≥ 15μmol/L, and Normal control group, n=128. Plasma Hcy and other biochemical parameters were determined by automatic analysis devices. Carotid-femoral pulse wave velocity (CF-PWV), carotid-radial pulse wave velocity (CR-PWV) and carotid-ankle pulse wave velocity (CA-PWV) were measured by Complior device. The above indexes were compared between 2 groups. Result

  13. Effects of storage time on total protein and globulin concentrations in bovine fresh frozen plasma obtained for transfusion.

    Science.gov (United States)

    Proverbio, D; Spada, E; Baggiani, L; Bagnagatti De Giorgi, G; Roggero, N; Belloli, A; Pravettoni, D; Perego, R

    2015-01-01

    To evaluate the effects of storage conditions on total protein (TP) and globulin fractions in fresh frozen bovine plasma units prepared and stored for transfusion, TP and globulin fractions were evaluated in fresh plasma and at 1 month and 6 and 12 months after blood collection in plasma stored at -20°C. Significant differences in concentrations were found in the median concentration of total protein (P=0.0336), between 0 months and 1 month (P=0.0108), 0 and 6 months (P=0.0023), and 0 and 12 months (P=0.0027), in mean concentration (g/dL) of albumin (P=0.0394), between 0 months and 1 month (P=0.0131), 0 and 6 months (P=0.0035), and 0 and 12 months (P=0.0038), and beta-2 fraction (P=0.0401), between 0 and 6 months (P=0.0401) and 0 and 12 months (P=0.0230). This study suggests that total gamma globulin concentration in bovine frozen plasma is stable for 12 months at -20°C. Total protein, ALB, and beta-2 fraction have significantly different concentrations (g/dL) when compared to prestorage. This study has shown IgG protein fraction stability in bovine fresh frozen plasma collected for transfusion; therefore, bovine fresh frozen plasma seems to be suitable for the treatment of hypogammaglobulinemia (failure of passive transfer) in calves when stored for 12 months at -20°C.

  14. Plasma and erythrocyte glutathione peroxidase activity, serum selenium concentration, and plasma total antioxidant capacity in cats with IRIS stages I-IV chronic kidney disease.

    Science.gov (United States)

    Krofič Žel, M; Tozon, N; Nemec Svete, A

    2014-01-01

    Serum selenium concentrations and the activity of plasma glutathione peroxidase (GPx) decrease with the progression of chronic kidney disease (CKD) in human patients. Selenium is considered a limiting factor for plasma GPx synthesis. Plasma total antioxidant capacity (TAC) is decreased in CKD cats in comparison to healthy cats. Serum selenium concentrations and plasma and erythrocyte GPx activity in cats with CKD are lower than in healthy cats. Serum selenium concentrations, the activity of enzymes, and plasma TAC progressively decrease with the progression of kidney disease according to IRIS (International Renal Interest Society) classification. Twenty-six client-owned cats in IRIS stages I-IV of CKD were compared with 19 client-owned healthy cats. A CBC, serum biochemical profile, urinalysis, plasma and erythrocyte GPx activity, serum selenium concentration, and plasma TAC were measured in each cat. Cats in IRIS stage IV CKD had a significantly higher (P = .025) activity of plasma GPx (23.44 ± 6.28 U/mL) than cats in the control group (17.51 ± 3.75 U/mL). There were no significant differences in erythrocyte GPx, serum selenium concentration, and plasma TAC, either among IRIS stages I-IV CKD cats or between CKD cats and healthy cats. Erythrocyte GPx activity, serum selenium concentration, and plasma TAC do not change in CKD cats compared with healthy cats. Selenium is not a limiting factor in feline CKD. Increased plasma GPx activity in cats with stage IV CKD suggests induction of antioxidant defense mechanisms. Antioxidant defense systems might not be exhausted in CKD in cats. Copyright © 2013 by the American College of Veterinary Internal Medicine.

  15. Plasma zinc antioxidant vitamins, glutathione levels and total antioxidant activity in oral leukoplakia

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    Subhash Chandra Bose

    2012-01-01

    Full Text Available Background: Leukoplakia is a common, potentially premalignant lesion with malignant transformation rate from 1 to 17% with highest transformation rate for the lesions on the floor of the mouth, soft palate and tongue. One of the main etiological factors is consuming areca nut and its commercial preparations which generate high levels of reactive oxygen species during their metabolism. So the aim of this present study is to evaluate the plasma levels of antioxidant vitamins, antioxidant mineral zinc, glutathione and total antioxidant status (TAS in leukoplakia patients. Materials and Methods: For this cross-sectional study, we selected 23 newly diagnosed oral leukoplakia patients of both sexes within the age group 28-40 years and the same number of age and sex matched healthy individuals without having history of any systemic illness were selected as control group. In both the groups, we measured plasma antioxidant vitamins A, C, E, antioxidant mineral zinc, GSH and TAS. Student′s t test was applied and the P value <0.001 was considered as statistically significant. Results: We observed very low levels of antioxidant vitamins A, C, E, antioxidant mineral zinc and antioxidant metabolite GSH (P<0.001 and at the same time we also observed very poor (TAS (P<0.001 in leukoplakia patients when compared to patients in control group. Conclusion: The consumption of tobacco or areca quid which contains high copper levels creates an oxidative stress like environment during their metabolism, might play a major role in causation and propagation of oral leukoplakia.

  16. Folate intake, lifestyle factors, and homocysteine concentrations in younger and older women

    DEFF Research Database (Denmark)

    Rasmussen, Lone Banke; Ovesen, L.; Bulow, I.

    2000-01-01

    Background: An elevated total homocysteine (tHcy) concentration is considered to be an independent risk factor for cardiovascular diseases and has also been associated with an increased risk of neural tube defects. Objective: The objective of this study was to investigate folate intake, folate...

  17. Analysis of biological properties of selected elements of haemostasis after treatment with the oxidized form of homocysteine in vitro.

    Science.gov (United States)

    Malinowska, Joanna; Olas, Beata

    2011-01-01

    The elevated level of homocysteine (Hcys; hyperhomocysteinemia, in relation to the total plasma Hcys concentration, >15 µM) is associated with different diseases in human, including cardiovascular diseases. In plasma, Hcys occurs in various forms (the reduced Hcys, the oxidized Hcys, homocysteine thiolactone (HTL) and a component of proteins as a result of N- or S-homocysteinylation). The mechanisms by which hyperhomocysteinemia contributes to changes of haemostasis are complex and unclear. The role of different forms of Hcys, which may be involved in the modulation of haemostatic process during hyperhomocysteinemia is also not yet well-known. Our previous works have shown that both Hcys in the reduced form and the most reactive form of Hcys-its thiolactone may modify fibrinolysis, coagulation process and biological activity of blood platelets. The mechanism by which the oxidized Hcys exerts the prothrombotic effect and influences on blood platelets or plasma remains unclear. The aim of our study in vitro was to establish and compare the influence of the oxidized Hcys (at final doses of 0.01-1 mM), the reduced Hcys (at final doses of 0.01-1 mM) and HTL (at final doses of 0.1-1 µM) on selected haemostatic properties of blood platelets (platelet aggregation and platelet microparticle formation measured by flow cytometry) and plasma (fibrin polymerization and lysis). Here, our results indicate that the oxidized Hcys, like the reduced Hcys or HTL-augmented blood platelet aggregation, stimulated polymerization of fibrinogen and reduced the fibrin lysis in plasma. But, we suggest that the most reactive form of Hcys may be HTL (at lower concentrations than Hcys) during hyperhomocysteinemia-induced cardiovascular diseases.

  18. Genetics of homocysteine metabolism and associated disorders

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    S. Brustolin

    2010-01-01

    Full Text Available Homocysteine is a sulfur-containing amino acid derived from the metabolism of methionine, an essential amino acid, and is metabolized by one of two pathways: remethylation or transsulfuration. Abnormalities of these pathways lead to hyperhomocysteinemia. Hyperhomocysteinemia is observed in approximately 5% of the general population and is associated with an increased risk for many disorders, including vascular and neurodegenerative diseases, autoimmune disorders, birth defects, diabetes, renal disease, osteoporosis, neuropsychiatric disorders, and cancer. We review here the correlation between homocysteine metabolism and the disorders described above with genetic variants on genes coding for enzymes of homocysteine metabolism relevant to clinical practice, especially common variants of the MTHFR gene, 677C>T and 1298A>C. We also discuss the management of hyperhomocysteinemia with folic acid supplementation and fortification of folic acid and the impact of a decrease in the prevalence of congenital anomalies and a decline in the incidence of stroke mortality.

  19. Preditores sócio-demográficos, de estilo de vida e gineco-obstétricos das concentrações séricas ou plasmáticas de homocisteína, ácido fólico e vitaminas B12 e B6 em mulheres de baixa renda de São Paulo, Brasil Socio-demographic, lifestyle, gynecological, and obstetric predictors of serum or plasma concentrations of homocysteine, folic acid, and vitamins B12 and B6 among low-income women in São Paulo, Brazil

    Directory of Open Access Journals (Sweden)

    Lana Carneiro Almeida

    2008-03-01

    Full Text Available O presente estudo investigou fatores sócio-demográficos, de estilo de vida e gineco-obstétricos associados às concentrações séricas ou plasmáticas de homocisteína, ácido fólico, vitaminas B12 e B6 em mulheres de baixa renda de São Paulo, Brasil. Concentrações séricas de ácido fólico e vitamina B12 foram analisadas por fluoroimunoensaio; concentrações plasmáticas de homocisteína e vitamina B6, por cromatografia líquida de alta performance em fase reversa. Variáveis independentes foram inicialmente selecionadas segundo pressupostos teóricos, correlação de Pearson ou teste Kruskal-Wallis (p This study examined the socio-demographic, lifestyle, gynecological, and obstetric factors associated with serum or plasma concentrations of homocysteine, folic acid, and vitamins B12 and B6 among low-income women in São Paulo, Brazil. Serum concentrations of folic acid and vitamin B12 were measured by fluoroimmunoassay, while plasma vitamin B6 and homocysteine levels were measured by reversed-phase high performance liquid chromatography. Independent variables were initially selected by Pearson correlation or Kruskal-Wallis test (p < 0.20. Based on cut-off values, altered concentrations of homocysteine, folic acid, and vitamins B12 and B6 were found in 20%, 6%, 11%, and 67% of participants, respectively. Age was positively correlated with vitamin B6 and homocysteine plasma concentrations (p < 0.001. Body mass index was positively correlated with vitamin B6 plasma concentration (p < 0.001. Multiple linear regression models accounted for 10.2%, 5.8%, 14.4%, and 9.4% of folic acid, vitamins B12 and B6, and homocysteine plasma or serum concentrations, respectively. In this study, socio-demographic, lifestyle, gynecological, and obstetric variables showed important predictive value for serum or plasma levels of the biochemical indicators assessed.

  20. The Relationship of dementia and psychological and behavioral symptoms of dementia to plasma homocysteine%痴呆及其心理、行为症状与血浆同型半胱氨酸水平关系

    Institute of Scientific and Technical Information of China (English)

    沈伟; 李海林; 叶勤; 刘阳; 吴瑞枝; 陆蓉

    2003-01-01

    目的探讨痴呆及痴呆心理和行为症状(Psychological and behavioral symptoms of dementia, BPSD)的可能发病机制,研究血浆同型半胱氨酸(homocysteine, Hcy)水平与痴呆及BPSD的关系. 方法阿尔茨海默病(Alzheimer Disease, AD)、混合性痴呆(Mixed dementia, MD)、血管性痴呆(Vascular dementia, VD)和正常对照组各30例参加本研究.采用Alzheimer病行为症状评定量表(The Behavioral Pathlology in Alzheimer Disease Rating Scale, BEHAVE-AD)评定痴呆患者BPSD.采用高压毛细血管电泳紫外检测法测定经2, 4-二硝基氟苯(2, 4-dimntrifluorobenzen, DNFB)衍生后的血浆Hcy水平. 结果 AD、MD和VD患者血浆Hcy浓度均显著高于正常对照组,血浆高Hcy水平的痴呆患者BEHAVE-AD总分较高. 结论血浆高Hcy水平不仅与痴呆的发生发展有关,且在痴呆患者BPSD的发病机制中扮演了一个重要角色.

  1. The effect of whisky and wine consumption on total phenol content and antioxidant capacity of plasma from healthy volunteers

    DEFF Research Database (Denmark)

    Duthie, GG; Pedersen, M W; PC, Morrice

    1998-01-01

    OBJECTIVE: To assess whether consumption of 100 ml of whisky or red wine by healthy male subjects increasedplasma total phenol content and antioxidant capacity. DESIGN: A Latin square arrangement to eliminate ordering effectswhereby, after an overnight fast, nine volunteers consumed 100 ml of red....... RESULTS: Within 30 min of consumption of the wine and whisky, there was a similar andsignificant increase in plasma total phenol content and antioxidant capacity as determined by the ferric reducing capacityof plasma (FRAP). No changes were observed following consumption of 'new make' spirit. CONCLUSIONS......:Consumption of phenolic-containing alcoholic beverages transiently raises total phenol concentration and enhances theantioxidant capacity of plasma. This is compatible with suggestions that moderate alcohol usage and increasedantioxidant intake decrease the risk of coronary heart disease....

  2. The relationship between cholesterol and cognitive function is homocysteine-dependent

    Directory of Open Access Journals (Sweden)

    Cheng YB

    2014-10-01

    Full Text Available Yibin Cheng,1 Yinlong Jin,1 Frederick W Unverzagt,2 Liqin Su,1 Lili Yang,3 Feng Ma,1 Ann M Hake,4,5 Carla Kettler,3 Chen Chen,1 Jingyi Liu,1 Jianchao Bian,6 Ping Li,7 Jill R Murrell,8 Hugh C Hendrie,2,9,10 Sujuan Gao3 1Institute for Environmental Health and Related Product Safety, Chinese Center for Disease Control and Prevention, Beijing, People’s Republic of China; 2Department of Psychiatry, 3Department of Biostatistics, 4Department of Neurology, Indiana University School of Medicine, Indianapolis, Indiana, USA; 5Eli Lilly and Company, Indianapolis, Indiana, USA; 6Shandong Institute for Prevention and Treatment of Endemic Disease in China, Jinan, People’s Republic of China; 7Sichuan Provincial Center for Disease Control and Prevention in China, Chengdu, People’s Republic of China; 8Department of Pathology and Laboratory Medicine, Indiana University School of Medicine, 9Indiana University Center for Aging Research, 10Regenstrief Institute, Inc., Indianapolis, Indiana, USA Introduction: Previous studies have identified hyperlipidemia as a potential risk factor for dementia and Alzheimer’s disease. However, studies on cholesterol measured in late-life and cognitive function have been inconsistent. Few studies have explored nonlinear relationships or considered interactions with other biomarker measures.Methods: A cross-sectional sample of 1,889 participants from four rural counties in the People’s Republic of China was included in this analysis. Serum total cholesterol, high-density lipoprotein, triglycerides, and homocysteine levels were measured in fasting blood samples. A composite cognitive score was derived based on nine standardized cognitive test scores. Analysis of covariance models were used to investigate the association between biomarker measures and the composite cognitive scores.Results: There was a significant interaction between the homocysteine quartile group and the cholesterol quartile group on cognitive scores (P=0

  3. Proteomic analysis of plasma from rats following total parenteral nutrition-induced liver injury.

    Science.gov (United States)

    Tsai, Jai-Jen; Kuo, Hsing-Chun; Lee, Kam-Fai; Tsai, Tung-Hu

    2015-11-01

    Total parenteral nutrition (TPN) is provided as the primary nitrogen source to manage patients with intestinal failure who were not able to sustain themselves on enteral feeds. The most common complication of long-term TPN use is hepatitis. A proteomic approach was used to identify proteins that are differentially expressed in the plasma of rats following TPN-related acute liver injury. Six male rats were randomly assigned to either the saline infusion control group or the TPN infusion group. Our results demonstrate that TPN infusion in rats resulted in hepatic dysfunction and hepatocyte apoptosis. Five proteins that were differentially expressed between TPN infusion and normal rats were determined and validated in vivo. Fascinatingly, the proteomic differential displays, downregulated proteins included peroxiredoxin 2 (PRDX2), alpha-1-antiproteinase (A1AT), and fibrinogen gamma chain (FIBG), which were involved in oxidative stress, inflammatory respondence and cells apoptosis. After TPN infusion, two protein spots showed increased expression, namely, the glucagon receptor (GLR) protein and apolipoprotein A-1 (APOA1), which may mediate the effects of TPN administration on glycogen and lipid metabolism. In this study, proteomic analysis suggested TPN-related acute liver injury could be involved in limiting cellular protection mechanisms against oxidative stress-induced apoptosis. On the basis of the results, we also give molecular evidences replying TPN-related hepatitis.

  4. S100B and homocysteine in the acute alcohol withdrawal syndrome.

    Science.gov (United States)

    Wedekind, Dirk; Neumann, Karolin; Falkai, Peter; Malchow, Berend; Engel, Kirsten Rita; Jamrozinski, Katja; Havemann-Reinecke, Ursula

    2011-03-01

    Elevations of serum homocysteine levels are a consistent finding in alcohol addiction. Serum S100B levels are altered in different neuropsychiatric disorders but not well investigated in alcohol withdrawal syndromes. Because of the close connection of S100B to ACTH and glutamate secretion that both are involved in neurodegeneration and symptoms of alcoholism the relationship of S100B and homocysteine to acute withdrawal variables has been examined. A total of 22 male and 9 female inpatients (mean age 46.9 ± 9.7 years) with an ICD-10 diagnosis of alcohol addiction without relevant affective comorbidity were examined on admission and after 24, 48, and 120 h during withdrawal. S100B and homocysteine levels in serum were collected, and severity of withdrawal symptoms (AWS-scale), applied withdrawal medication, initial serum ethanol levels and duration of addiction were recorded. Serum S100B and homocysteine levels declined significantly (P < .05) over time. Both levels declined with withdrawal syndrome severity. Females showed a trend to a more intense decline in serum S100B levels compared to males at day 5 (P = .06). Homocysteine levels displayed a negative relationship to applied amount of clomethiazole (P < .05) and correlated with age of onset of addiction. No withdrawal seizures were recorded during the trial. As it is known for homocysteine, S100B revealed to decline rapidly over withdrawal treatment in alcoholism. This effect is more pronounced in female patients. S100B could be of relevance in the neurobiology of alcohol withdrawal syndromes. It may be indirectly related to the level of stress level or glutamatergic activity during alcohol withdrawal.

  5. 高同型半胱氨酸、高纤维蛋白原等与Binswanger病脑白质疏松严重程度的相关性%Correlation between severity of leukoaraiosis and plasma levels of homocysteine and fibrinogen in patients with Binswanger disease

    Institute of Scientific and Technical Information of China (English)

    杨映珊; 伍爱民; 陆正齐; 张炳俊; 门雪娇; 胡学强

    2012-01-01

    目的 探讨高同型半胱氨酸(Hcy)、高纤维蛋白原(Fib)等对Binswanger病(BD)脑白质疏松(LA)严重程度的影响.方法 对自2005年1月1日至2011年5月9日在中山大学附属第三医院住院且确诊为BD的患者进行血清Hcy、Fib、低密度脂蛋白(LDL)、载脂蛋白A(Apoa)、载脂蛋白B(Apob)、高密度脂蛋白(HDL)检测,并将BD患者按LA头颅MRI表现严重程度分为轻、中、重3型,单因素分析及有序Logistic回归法分析Fib、Hcy等因素与LA严重程度的关系.结果 单因素分析结果显示:LA不同严重程度组间性别、年龄、高血压病、卒中史、高脂血症比较差异有统计学意义(P<0.05).LA严重程度与Hcy、Fib存在正向的等级相关关系(P<0.05).有序Logistic回归分析结果显示:女性LA程度比男性更严重;年龄越大,有卒中史和Fib测定值越大,LA程度更严重(P<0.05).结论 Fib水平是BD恶化的一个重要因素,降低Fib水平可能对延缓BD病情进展有效.%Objective To investigate the correlation between severity of leukoaraiosis (LA) and plasma levels of homocysteine and fibrinogen in patients with Binswanger disease (BD).Methods All patients with BD,admitted to our hospital from January 2005 to May 2011,were selected consistently with the diagnostic criteria of Bennett.The levels of plasma homocysteine (Hcy),fibrinogen (Hcy),low-density lipoprotein (LDL),apolipoprotein A (Apoa),apolipoprotein B (Apob),and high-density lipoprotein (HDL) were measured.According to the Kinkel's classification of BD,the severity of LA was graded as mild,moderate,or severe by its appearance under MRI.The relation between levels of plasma Hcy and Fib and severity of LA in BD patients were analyzed.Results Single factor analysis indicated that the dispositions of gender,age,hypertensive disease,stroke and hyperlipoidemia in BD patients with different severities of LA were significantly different (P<0.05).The severity degree of LA was positively

  6. Effect of Homocysteine-Lowering Nutrients on Blood Lipids: Result from Four Randomised, Placebo-Controlled Studies in Healthy Humans

    NARCIS (Netherlands)

    Olthof, M.R.; Vliet, van T.; Verhoef, P.; Zock, P.L.; Katan, M.B.

    2005-01-01

    Background Betaine (trimethylglycine) lowers plasma homocysteine, a possible risk factor for cardiovascular disease. However, studies in renal patients and in obese individuals who are on a weight-loss diet suggest that betaine supplementation raises blood cholesterol; data in healthy individuals ar

  7. Homocysteine inhibits hepatocyte proliferation via endoplasmic reticulum stress.

    Directory of Open Access Journals (Sweden)

    Xue Yu

    Full Text Available Homocysteine is an independent risk factor for coronary, cerebral, and peripheral vascular diseases. Recent studies have shown that levels of homocysteine are elevated in patients with impaired hepatic function, but the precise role of homocysteine in the development of hepatic dysfunction is unclear. In this study, we examined the effect of homocysteine on hepatocyte proliferation in vitro. Our results demonstrated that homocysteine inhibited hepatocyte proliferation by up-regulating protein levels of p53 as well as mRNA and protein levels of p21(Cip1 in primary cultured hepatocytes. Homocysteine induced cell growth arrest in p53-positive hepatocarcinoma cell line HepG2, but not in p53-null hepatocarcinoma cell line Hep3B. A p53 inhibitor pifithrin-α inhibited the expression of p21(Cip1 and attenuated homocysteine-induced cell growth arrest. Homocysteine induced TRB3 expression via endoplasmic reticulum stress pathway, resulting in Akt dephosphorylation. Knock-down of endogenous TRB3 significantly suppressed the inhibitory effect of homocysteine on cell proliferation and the phosphorylation of Akt. LiCl reversed homocysteine-mediated cell growth arrest by inhibiting TRB3-mediated Akt dephosphorylation. These results demonstrate that both TRB3 and p21(Cip1 are critical molecules in the homocysteine signaling cascade and provide a mechanistic explanation for impairment of liver regeneration in hyperhomocysteinemia.

  8. Mass spectrometry evidence for formation of estrogen-homocysteine conjugates: estrogens can regulate homocysteine levels.

    Science.gov (United States)

    Gaikwad, Nilesh W

    2013-12-01

    Homocysteine (HCys), a sulfur-containing amino acid, is formed during the metabolism of methionine. An imbalance between the rate of production and the use of HCys during methionine metabolism can result in an increase in the plasma and urinary levels of HCys. HCys has been shown to be toxic to vascular endothelial cells through several pathways. Many earlier clinical studies have revealed an association between plasma HCys and cardiovascular and other diseases. In contrast, estrogens are suggested to lower the risk of cardiovascular disease. Several studies indicate that estrogen metabolites could be responsible for cardiovascular protection. It has been demonstrated that electrophilic estrogen quinones, E1(E2)-2,3-Q and E1(E2)-3,4-Q, can alkylate DNA as well as form conjugates with glutathione. I hypothesize that estrogen quinones generated in situ by oxidative enzymes, metal ions, or molecular oxygen can interact with HCys to form conjugates. This in turn could lower the levels of toxic HCys as well as quenching the reactive estrogen quinones, resulting in cardiovascular protective effects. To test the feasibility of a protective estrogen-HCys pathway, estrogen quinones were treated with HCys. Tandem mass spectrometry analysis of the assay mixture shows the formation of estrogen-HCys conjugates. Furthermore, incubation of catechol estrogens with myeloperoxidase (MPO) in the presence of HCys resulted in the formation of respective estrogen-HCys conjugates. The identities of estrogen-HCys conjugates in MPO assay extracts were confirmed by comparing them to pure synthesized estrogen-HCys standards. I propose that through conjugation estrogens could chemically regulate HCys levels; moreover these conjugates could be used as potential biomarkers in determining health.

  9. Phenolic fractions from Trifolium pallidum and Trifolium scabrum aerial parts in human plasma protect against changes induced by hyperhomocysteinemia in vitro.

    Science.gov (United States)

    Malinowska, Joanna; Kołodziejczyk-Czepas, Joanna; Moniuszko-Szajwaj, Barbara; Kowalska, Iwona; Oleszek, Wiesław; Stochmal, Anna; Olas, Beata

    2012-11-01

    Elevated concentration of homocysteine (Hcy) in human plasma, defined as hyperhomocysteinemia has been correlated with some diseases, such as cardiovascular, neurodegenerative, and kidney disorders. Homocysteine occurs in human plasma in several forms, including the most reactive form of Hcy - its cyclic thioester - homocysteine thiolactone (HTL), which represents up to 0.29% of plasma total Hcy. It is suggested that Hcy and HTL may also act as oxidants, but various polyphenolic antioxidants are able to inhibit the oxidative damage induced by Hcy or HTL. The aim of our present study was to investigate in vitro oxidative changes in human plasma induced by the model of hyperhomocysteinemia in the presence of the phenolic fractions from selected clovers (Trifolium pallidum and Trifolium scabrum aerial parts). Hyperhomocysteinemia was stimulated by a reduced form of Hcy (final dose 100 μM) or HTL (final dose 1 μM). The aim of our study was also to explain the effect of the phenolic fractions on the coagulation activity of human plasma treated with Hcy and its thiolactone. Tested phenolic fractions significantly inhibited the oxidative stress (measured by the total antioxidant level - TAS) in plasma treated with Hcy or HTL. The phenolic fractions from T. pallidum and T. scabrum also caused a distinct reduction of plasma lipid peroxidation (measured by the level of thiobarbituric acid reactive substance) induced by the model of hyperhomocysteinemia. Moreover, tested fractions modulated the coagulation properties of plasma treated with homocysteine and its thiolactone. It seems that antioxidative activities of the phenolic fractions from T. pallidum and T. scabrum aerial parts may be responsible for their medicinal properties during hyperhomocysteinemia.

  10. Homocysteine, vitamin B12 and folate levels in premature coronary artery disease

    Directory of Open Access Journals (Sweden)

    Fallah Nader

    2006-09-01

    Full Text Available Abstract Background Hyperhomocysteinemia is known as an independent risk factor of atherosclerosis, but the probable role of hyperhomocysteinemia in premature Coronary Artery Disease (CAD is not well studied. The aim of this study was to assess the role of hyperhomocysteinemia, folate and Vitamin B12 deficiency in the development of premature CAD. Methods We performed an analytical case-control study on 294 individuals under 45 years (225 males and 69 females who were admitted for selective coronary angiography to two centers in Tehran. Results After considering the exclusion criteria, a total number of 225 individuals were enrolled of which 43.1% had CAD. The mean age of participants was 39.9 +/- 4.3 years (40.1 +/- 4.2 years in males and 39.4 +/- 4.8 years in females. Compared to the control group, the level of homocysteine measured in the plasma of the male participants was significantly high (14.9 +/- 1.2 versus 20.3 +/- 1.9 micromol/lit, P = 0.01. However there was no significant difference in homocysteine level of females with and without CAD (11.8 +/- 1.3 versus 11.5 ± 1.1 micromol/lit, P = 0.87. Mean plasma level of folic acid and vitamin B12 in the study group were 6.3 +/- 0.2 and 282.5 +/- 9.1 respectively. Based on these findings, 10.7% of the study group had folate deficiency while 26.6% had Vitamin B12 deficiency. Logistic regression analysis for evaluating independent CAD risk factors showed hyperhomocysteinemia as an independent risk factor for premature CAD in males (OR = 2.54 0.95% CI 1.23 to 5.22, P = 0.01. Study for the underlying causes of hyperhomocysteinemia showed that male gender and Vitamin B12 deficiency had significant influence on incidence of hyperhomocysteinemia. Conclusion We may conclude that hyperhomocysteinemia is an independent risk factor for CAD in young patients (bellow 45 years old – especially in men -and vitamin B12 deficiency is a preventable cause of hyperhomocysteinemia.

  11. Relationship between plasma homocysteine level and typi2 diabetic gastrointestinal neuropathy%血浆同型半胱氨酸水平与2型糖尿病胃肠神经病变的关系

    Institute of Scientific and Technical Information of China (English)

    白然; 王亚军; 杨郁; 巴颖; 邢倩; 杜建玲; 李昌臣

    2011-01-01

    Objective To investigate the relationship between the plasma horocysteine level(Hcy)and type 2 diabetic (T2DM) gastrointestinal neuropathy, and to find the risk factors for gastrointestinal neuropathy. Methods The study subjects included three groups: control groups (NC), T2DM without gastrointestinal neuropathy (Non-DGN) and diabetic gastrointestinal neuropathy group (DGN). The fasting plasma Hcy concentration and electrogastrogram were determined Results Plasrra levels of Hcy were higher in total diabetes groups than in control group (P<0. 05). The Hcy level was higher in DGN group than in nonDGN group,but there was no significant difference(P>0. 05). The Spearman correlation analysis and logistic regression analysis showed that age and duration were independent risk factors for diabetic gastrointestinal neuropathy. Conclusions High Hcy levels may not be associated with diabetic gastrointestinal neuropathy. Age and duration may be the risk factors for the development of gastrointestinal neuropathy in type 2 diabetic patients.%目的 探讨血浆同型半胱氨酸(Hcy)水平与糖尿病胃肠神经病变(DGN)的关系及2型糖尿病(T2DM)患者发生胃肠神经病变的危险因素.方法 60例T2DM患者分为无DGN(NDGN)组31例和DGN组29例,30名健康体检者作为正常对照(NC)组,分别采血测定空腹Hcy等指标.结果 NDGN组和DGN组的血浆Hcy水平均高于NC组(P<0.05).DGN组Hcy水平略高于NDGN组,但差异无统计学意义(P>0.05).年龄及病程与DGN显著相关(P<0.05).结论 血浆Hcy浓度升高可能与DGN的发生发展无关,年龄及病程是DGN的独立危险因素.

  12. Increase in plasma total antioxidant capacity of grazing Japanese Black heifers and cows in forestland in Japan.

    Science.gov (United States)

    Haga, Satoshi; Ishizaki, Hiroshi; Nakano, Miwa; Nakao, Seiji; Hirano, Kiyoshi; Yamamoto, Yoshito; Kitagawa, Miya; Sasaki, Hiroyuki; Kariya, Yoshihiro

    2014-02-01

    Blood total antioxidant capacity (TAC) has become a key bio-marker for animal health. Forest-grazing cattle are known to forage various native plants that have high TAC. This study evaluated differences of plasma TAC between forest-grazing (FG) and pasture-grazing cattle (PG). Experiment 1 monitored the plasma TAC levels of 32 Japanese Black cattle. The level in PG did not change throughout the grazing period. However, that in FG, which increased from summer, was significantly higher than that in PG through fall (P antioxidant parameters and the TAC in plants that the cattle consumed in late June and September. The plasma TAC levels in FG were significantly higher than those in PG in both periods (P pasture grasses. Results of this study show that plasma TAC of grazing Japanese Black cattle in forestland increase from summer through fall.

  13. Turkish propolis supresses MCF-7 cell death induced by homocysteine.

    Science.gov (United States)

    Tartik, Musa; Darendelioglu, Ekrem; Aykutoglu, Gurkan; Baydas, Giyasettin

    2016-08-01

    Elevated plasma homocysteine (Hcy) level is a most important risk factor for various vascular diseases including coronary, cerebral and peripheral arterial and venous thrombosis. Propolis is produced by honeybee from various oils, pollens and wax materials. Therefore, it has various biological properties including antioxidant, antitumor and antimicrobial activities. This study investigated the effects of propolis and Hcy on apoptosis in cancer cells. According to our findings, Hcy induced apoptosis in human breast adenocarcinoma (MCF-7) cells by regulating numerous genes and proteins involved in the apoptotic signal transduction pathway. In contrast, treatment with propolis inhibited caspase- 3 and -9 induced by Hcy in MCF-7 cells. It can be concluded that Hcy may augment the activity of anticancer agents that induce excessive reactive oxygen species (ROS) generation and apoptosis in their target cells. In contrast to the previous studies herein we found that propolis in low doses protected cancer cells inhibiting cellular apoptosis mediated by intracellular ROS-dependent mitochondrial pathway.

  14. Homocysteine and cognitive functions in bipolar depression

    Directory of Open Access Journals (Sweden)

    Agnieszka Permoda-Osip

    2014-12-01

    The results obtained show higher HCY concentration in considerable proportion of patients with bipolar depression, especially in men. They also confirm a connect between high homocysteine concentration and worse performance in some neuropsychological tests. Such relationship was more marked in men.

  15. Total plasma clearance versus urinary plasma clearance of (51)Cr-EDTA in patients with cirrhosis with and without fluid retention

    DEFF Research Database (Denmark)

    Henriksen, Ulrik Lütken; Hansen, Hanne B; Ring-Larsen, Helmer

    2015-01-01

    Abstract Background and aim. In patients with fluid retention, the total plasma clearance of (51)Cr-EDTA (ClP) may overestimate the glomerular filtration rate (GFR). The present study was therefore undertaken in order to compare ClP with the urinary plasma clearance of (51)Cr-EDTA (ClU) in patients...... with cirrhosis with and without fluid retention. Material and methods. A total of 136 patients with cirrhosis (24 without fluid retention, 112 with ascites) received a quantitative intravenous injection of (51)Cr-EDTA followed by plasma and quantitative urinary samples for 5 hours. ClP was determined from...... the injected dose relative to the plasma concentration-time area, extrapolated to infinity. ClU was determined as urinary excretion relative to the plasma concentration-time area up to voiding. Results. In patients without fluid retention, the difference between ClP and ClU (ClP - ClU = ClΔ) was mean 4.5 m...

  16. X-ray plasma diagnostics for totally and partially photoionized plasmas such as warm absorbers in agn

    Directory of Open Access Journals (Sweden)

    Delphine Porquet

    2000-01-01

    Full Text Available Gracias a la nueva generaci on de satelites de rayos-X, como Chandra y XMM, se pueden obtener espectros de alta sensibilidad y resoluci on. En particular, se pueden separar las tres l neas m as intensas (resonantes, de intercombinaci on y prohibidas de iones de baja carga (baja Z como el He, en plasmas no solares. Basados en estas tres l neas, presentamos diagn osticos para densidad, procesos de ionizaci on y temperatura totalmente o parcialmente ionizados por fotoionizaci on. Estos poderosos diagn osticos pueden ser usados en plasmas calientes como los de AGN, galaxias con brotes de formaci on estelar, binarias de rayos-X, etc. En parti- cular, pueden ser usados en los absorbedores tibios que se ven en AGN (Porquet & Dubau 2000, que son herramientas importantes para entender las regiones centrales de diferentes tipos de AGN (Seyferts 1 y 2 y cuasares de bajo y alto corrimiento al rojo.

  17. IFCC reference measurement procedure for substance concentration determination of total carbon dioxide in blood, plasma or serum

    NARCIS (Netherlands)

    Burnett, RW; Covington, AK; Fogh-Andersen, N; Kulpmann, WR; Lewenstam, A; Mas, AHJ; VanKessel, AL; Zijlstra, WG

    2001-01-01

    A reference measurement procedure for substance concentration determination of total CO, in blood, plasma (the anticoagulant is usually heparin) or serum is described. The document covers the principle of the method, the materials and equipment needed and essential aspects of the procedure. The subs

  18. Homocysteine Levels in Parkinson’s Disease: Is Entacapone Effective?

    Directory of Open Access Journals (Sweden)

    Bilge Kocer

    2016-01-01

    Full Text Available Plasma homocysteine (Hcy levels may increase in levodopa-treated patients with Parkinson’s disease (PD as a consequence of levodopa methylation via catechol-O-methyltransferase (COMT. Results from previous studies that assessed the effect of COMT inhibitors on levodopa-induced hyperhomocysteinemia are conflicting. We aimed to evaluate the effects of levodopa and entacapone on plasma Hcy levels. A hundred PD patients were enrolled to the study and divided into three treatment groups (group I: levodopa and/or dopamine agonists; group II: levodopa, entacapone, and/or a dopamine agonist; and group III: dopamine agonist alone. We measured the serum B12, folic acid, and Hcy levels in all patients. There were no statistically significant differences between groups in terms of modified Hoehn and Yahr stages, Unified Parkinson’s Disease Rating Scale II/III, Standardized Mini-Mental Test scores, and serum vitamin B12 and folic acid levels. Plasma median Hcy levels were found above the normal laboratory values in groups I and II, but they were normal in group III. However, there was no statistically significant difference in plasma Hcy levels between groups. Our results showed that levodopa treatment may cause a slight increase in the Hcy levels in PD compared with dopamine agonists and that COMT inhibitors may not have a significant effect on preventing hyperhomocysteinemia.

  19. Plasma nitrite levels, total antioxidant status, total oxidant status, and oxidative stress index in patients with tension-type headache and fibromyalgia.

    Science.gov (United States)

    Neyal, Munife; Yimenicioglu, Fatih; Aydeniz, Ali; Taskin, Abdullah; Saglam, Sadullah; Cekmen, Mustafa; Neyal, Abdurrahman; Gursoy, Savas; Erel, Ozcan; Balat, Ayse

    2013-06-01

    Tension-type headache (TTH) and fibromyalgia syndrome (FM) are worldwide seen chronic pain syndromes of unknown etiology. Despite the growing body of data on pathophysiology and generation mechanisms of pain; our knowledge on pain mechanisms in both FM and TTH is yet to be limited. We investigated the plasma nitrite levels, total antioxidant status (TAS), total oxidant status (TOS), and oxidative stress index (OSI) in 35 TTH, 33 FM patients and 31 healthy controls. The mean plasma nitrite levels and TAS levels were significantly low and OSI was found to be significantly high in TTH and FM groups compared to the control group (p=0.001, p=0.001, p=0.001 and p=0.001, respectively). The mean serum TOS levels were also significantly higher in FM group according to the control group (p=0.034), but there was not a significant difference between TTH and control groups (p=0.066). These results indicated that; FM and TTH patients revealed higher oxidative stress index and lower total nitrite levels than healthy controls. We conclude that oxidative stress may have a role in the pathophysiological mechanisms of TTH and FM, although, whether it is the cause or the consequence, is not clear. Copyright © 2012 Elsevier B.V. All rights reserved.

  20. Influence of Depressive State on Levels of Homocysteine and Thyroid Hormone in Patients with Hypertension

    Directory of Open Access Journals (Sweden)

    Wei-wei WANG

    2015-12-01

    Full Text Available Abstract Objective: To explore the influence of depressive state on the levels of homocysteine (Hcy and thyroid hormone in patients with hypertension.Methods: Totally 179 patients with primary hypertension were selected and divided into depression group (n=97 and non-depression group (n=82 according to whether to be complicated with depressive disorder. The venous blood was drawn for detecting the level of Hcy of 2 groups by enzymatic cycling assay, and serum free triiodothyronine (FT3, free thyroxine (FT4 and thyrotropic hormone (TSH by chemiluminiscence. The correlation between Hamilton depression scale (HAMD scores and levels of plasma Hcy and serum FT3, FT4 and TSH was analyzed.Results: Compared with non-depression group, the level of plasma Hcy increased and the levels of FT3 and FT4 decreased in depression group (P<0.05, but there was no statistical difference between 2 groups (P>0.05. HAMD scores in depression group had a positive correlation with the level of plasma Hcy (r=0.593, P=0.024, a negative correlation with the level of serum FT3 (r=-0.421,P=0.011, and no relationships with the levels of serum FT4 and TSH (r=-0.137, P=0.334; r=0.058, P=0.576.Conclusion: Hypertensive patients complicated with depression have abnormal level of Hcy and thyroid hormones. Moreover, the depressive degree of patients is positively correlated with the level of Hcy and negatively with the level of FT3.

  1. Elevated homocysteine by levodopa is detrimental to neurogenesis in parkinsonian model.

    Directory of Open Access Journals (Sweden)

    Jin Young Shin

    Full Text Available BACKGROUND: Modulation of neurogenesis that acts as an endogenous repair mechanism would have a significant impact on future therapeutic strategies for Parkinson's disease (PD. Several studies demonstrated dopaminergic modulation of neurogenesis in the subventricular zone (SVZ of the adult brain. Levodopa, the gold standard therapy for PD, causes an increase in homocysteine levels that induces neuronal death via N-methyl-D-aspartate (NMDA receptor. The present study investigated whether elevated homocysteine by levodopa treatment in a parkinsonian model would modulate neurogenesis via NMDA receptor signal cascade and compared the effect of levodopa and pramipexol (PPX on neurogenic activity. METHODOLOGY/PRINCIPAL FINDINGS: Neurogenesis was assessed in vitro using neural progenitor cells (NPCs isolated from the SVZ and in vivo with the BrdU-injected animal model of PD using 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine. Modulation of homocysteine levels was evaluated using co-cultures of NPCs and astrocytes and PD animals. Immunochemical and Western blot analyses were used to measure neurogenesis and determine the cell death signaling. Levodopa treatment increased release of homocysteine on astrocytes culture media as well as in plasma and brain of PD animals. Increased homocysteine by levodopa led to increased apoptosis of NPCs through the NMDA receptor-dependent the extracellular signal-regulated kinase (ERK signaling pathways. The administration of a NMDA antagonist significantly attenuated apoptotic cell death in levodopa-treated NPCs and markedly increased the number of BrdU-positive cells in the SVZ of levodopa-treated PD animals. Comparative analysis revealed that PPX treatment significantly increased the number of NPCs and BrdU-positive cells in the SVZ of PD animals compared to levodopa treatment. Our present study demonstrated that increased homocysteine by levodopa has a detrimental effect on neurogenesis through NMDA receptor

  2. [Homocysteine related vitamins and lifestyles in the elderly people: The SENECA study].

    Science.gov (United States)

    Varela-Moreiras, G; Escudero, J M; Alonso-Aperte, E

    2007-01-01

    The SENECA study started in 1988 and consisted of a random age- and sex-stratified sample of inhabitants of 19 European towns. A total of 2.100 elderly people were finally able to be included in the study. The present study includes results for total plasma homocysteine (tHcy) and the related vitamins folate, B12 and B6. Other style factors as alcohol consumption or smoking have been also evaluated. The lowest values for tHcy corresponded to Mediterranean countries (Portugal, Spain, and Greece), compared to central or northern european countries (Netherland or Belgium (differences higher than 4 micromol/l). In addition, an interesting north-south gradient is observed, with the lowest values for tHcy corresponding to Betanzos (Spain), 12.38 micromol/l followed by both centers in Portugal, whereas the highest concentrations are found in Maki (Poland), 21.92 pmol/I and Culemborg (Netherlands), 20.41 mircromol/l. The mean tHcy concentration for all the European centers was 15.98 micromol/l. Effect of sex has been also evaluated: those countries with the lowest tHcy concentration (i.e. Spain or Portugal) show significant (p < 0.01) higher tHcy concentration in men vs women, whereas these differences by sex are not observed in countries with the highest tHcy values. The effect of "aging" within the same individuals after ten years of follow up was also evaluated: a significant difference was observed for the same individuals in the 10-years period. Plasma folic acid was compared to tHcy values, resulting also in marked differences between north and southern countries. Plasma vitamin B12 also shows a close pattern. Either plasma folate or vitamin B12 were shown as strong predictors of tHcy. This effect was not observed for plasma vitamin B6. Total alcohol intake was positively and significantly (p < 0.01) correlated with tHcy ("no" intake corresponded with the lowest tHcy, 14.3 micromol/l vs "high" intake-over 30 g/d-with the highest tHcy, 17 micromol/l). The type of

  3. Pediatric reference intervals for plasma free and total metanephrines established with a parametric approach: relevance to the diagnosis of neuroblastoma.

    Science.gov (United States)

    Franscini, Laura Crosazzo; Vazquez-Montes, Maria; Buclin, Thierry; Perera, Rafael; Dunand, Marielle; Grouzmann, Eric; Beck-Popovic, Maja

    2015-04-01

    Urine catecholamines, vanillylmandelic, and homovanillic acid are recognized biomarkers for the diagnosis and follow-up of neuroblastoma. Plasma free (f) and total (t) normetanephrine (NMN), metanephrine (MN) and methoxytyramine (MT) could represent a convenient alternative to those urine markers. The primary objective of this study was to establish pediatric centile charts for plasma metanephrines. Secondarily, we explored their diagnostic performance in 10 patients with neuroblastoma. We recruited 191 children (69 females) free of neuroendocrine disease to establish reference intervals for plasma metanephrines, reported as centile curves for a given age and sex based on a parametric method using fractional polynomials models. Urine markers and plasma metanephrines were measured in 10 children with neuroblastoma at diagnosis. Plasma total metanephrines were measured by HPLC with coulometric detection and plasma free metanephrines by tandem LC-MS. We observed a significant age-dependence for tNMN, fNMN, and fMN, and a gender and age-dependence for tMN, fNMN, and fMN. Free MT was below the lower limit of quantification in 94% of the children. All patients with neuroblastoma at diagnosis were above the 97.5th percentile for tMT, tNMN, fNMN, and fMT, whereas their fMN and tMN were mostly within the normal range. As expected, urine assays were inconstantly predictive of the disease. A continuous model incorporating all data for a given analyte represents an appealing alternative to arbitrary partitioning of reference intervals across age categories. Plasma metanephrines are promising biomarkers for neuroblastoma, and their performances need to be confirmed in a prospective study on a large cohort of patients. © 2015 Wiley Periodicals, Inc.

  4. Acute phase response of selenium status and glutathione peroxidase activity in blood plasma before and after total knee arthroplasty surgery.

    Science.gov (United States)

    Defi, Irma Ruslina; Yamazaki, Chiho; Kameo, Satomi; Kobayashi, Kenji; Nakazawa, Minato; Shinya, Yanagisawa; Sato, Naoki; Wada, Naoki; Shirakura, Kenji; Koyama, Hiroshi

    2011-12-01

    Several studies show the consistent results of the decrease in plasma or serum selenium (Se) after surgery, and the change is suggested to be a negative acute phase response of Se to the surgical inflammation. Plasma glutathione peroxidase (GPx), which is included in the acute phase response proteins, is a selenoenzyme. However, previous studies failed to show any changes in GPx activity before and after surgery. In the present study, we investigated the Se- and selenoenzyme responses that accompany the acute inflammatory reactions during and following major surgery. Patients who underwent elective total knee arthroplasty surgery due to knee osteoarthritis at the Department of Orthopaedic Surgery at Gunma University Hospital in Japan were studied. The plasma Se concentration was determined, and the activity of plasma GPx was measured. C-reactive protein (CRP), albumin, blood urea nitrogen (BUN), and white blood cell (WBC) count were also analysed. Increases in the inflammatory biomarkers of CRP and WBC showed inflammatory reactions with the surgery. A significant increase in plasma GPx activity (p production of other series of acute phase proteins, the present results suggest that there is a redistribution of plasma Se to GPx that occurs as an acute phase response, and the source of Se for GPx could be, at least partly, from albumin.

  5. Standard test method for analysis of total and isotopic uranium and total thorium in soils by inductively coupled plasma-mass spectrometry

    CERN Document Server

    American Society for Testing and Materials. Philadelphia

    2008-01-01

    1.1 This test method covers the measurement of total uranium (U) and thorium (Th) concentrations in soils, as well as the determination of the isotopic weight percentages of 234U, 235U, 236U, and 238U, thereby allowing for the calculation of individual isotopic uranium activity or total uranium activity. This inductively coupled plasma-mass spectroscopy (ICP-MS) method is intended as an alternative analysis to methods such as alpha spectroscopy or thermal ionization mass spectroscopy (TIMS). Also, while this test method covers only those isotopes listed above, the instrumental technique may be expanded to cover other long-lived radioisotopes since the preparation technique includes the preconcentration of the actinide series of elements. The resultant sample volume can be further reduced for introduction into the ICP-MS via an electrothermal vaporization (ETV) unit or other sample introduction device, even though the standard peristaltic pump introduction is applied for this test method. The sample preparatio...

  6. Relationship between subclinical hypothyroidism and serum homocysteine concentration in premenopausal women

    Directory of Open Access Journals (Sweden)

    Ayfer Aydoğdu Çolak

    2013-09-01

    Full Text Available Objective: In our study we aimed to examine serum homocysteinelevels of patients without thyroid dysfunctionswho have high serum anti thyroid peroxidase (anti-TPOlevels and patients with subclinical hypothyroidism whohave high serum thyroid stimulating hormone (TSH andanti-TPO levels.Methods: One hundred and seven premenopause femaleoutpatients who referred to endocrine clinic of our hospitalwere included in our study. We generated 3 groups. Firstgroup (Control consists of 53 (50% patients between theages of 30-40 years. Second group (Euthyroid consistsof 31 (29% patients between the ages of 26-49. Thirdgroup (Subclinical Hypothyroidism consists of 23 (21%patients between the ages of 33-53 years. Serum totalcholesterol, triglycerides, high density lipoprotein (HDLlevels were measured by Olympus 2700 autoanalyzer.Serum TSH, free T4, anti-TPO and homocysteine levelswere measured by Siemens Immulite 2000 autoanalyzer.Results: In our study, total cholesterol, triglycerides, lowdensity lipoprotein (LDL and very low density lipoprotein(VLDL levels were not statistically significantly differentamong the groups. Although serum homocysteine levelsof the third group were higher than the other groups it wasnot statistically significantly different among the groups.Conclusion: Serum homocysteine and lipid levels of patientswith euthyroidism and subclinical hypothyroidismwho have positive anti-TPO levels may be inadequate inassessing the risk of cardiovascular diseases. J Clin ExpInvest 2013; 4 (3: 293-297Key words: Hypothyroidsm, homocysteine, premenopause

  7. [Serum folate and homocysteine concentrations in women smoking during pregnancy and in umbilical cord blood of newborns].

    Science.gov (United States)

    Ambroszkiewicz, Jadwiga; Chełchowska, Magdalena; Lewandowski, Leszek; Gajewska, Joanna; Laskowska-Klita, Teresa

    2007-01-01

    In metabolism of homocysteine several enzymes and vitamin cofactors are involves. Genetic abnormalities in these enzymes or nutritional deficiency vitamins, especially of folate may lead to hyperhomocysteinemia, a known risk factor for some pregnancy complications. High maternal homocysteine and low folate levels correlate with low birth weight. Maternal smoking affected significantly total homocysteine concentration in infants. Studies in this area are still scarce and report on limited number of patients. The aim of our study was to assess serum folate and total homocysteine (tHcy) concentrations in smoking pregnant women and in their newborn infants as compared with nonsmoking. The study consisted of 57 pregnant women, who qualified into two groups: smoking (n=28) and nonsmoking (n=29). The serum concentrations of folate were determined by electrochemiluninescent method and tHcy by fluorescence polarization immunoassay. We shown, that serum homocysteine concentrations were significantly higher in smoking as compared with nonsmoking pregnant women (phomocysteine and folate showed a significant positive correlation's with these parameters in newborns. Average birth weight infants born to smoking mother was significantly lower than nonsmoking cigarettes (phomocysteine levels in serum of mothers and their infants. Smoking exposure is also associate with reduced birth weight.

  8. Homocysteine and reactive oxygen species in metabolic syndrome, type 2 diabetes mellitus, and atheroscleropathy: The pleiotropic effects of folate supplementation

    Directory of Open Access Journals (Sweden)

    Tyagi Suresh C

    2004-05-01

    Full Text Available Abstract Homocysteine has emerged as a novel independent marker of risk for the development of cardiovascular disease over the past three decades. Additionally, there is a graded mortality risk associated with an elevated fasting plasma total homocysteine (tHcy. Metabolic syndrome (MS and type 2 diabetes mellitus (T2DM are now considered to be a strong coronary heart disease (CHD risk enhancer and a CHD risk equivalent respectively. Hyperhomocysteinemia (HHcy in patients with MS and T2DM would be expected to share a similar prevalence to the general population of five to seven percent and of even greater importance is: Declining glomerular filtration and overt diabetic nephropathy is a major determinant of tHcy elevation in MS and T2DM. There are multiple metabolic toxicities resulting in an excess of reactive oxygen species associated with MS, T2DM, and the accelerated atherosclerosis (atheroscleropathy. HHcy is associated with an increased risk of cardiovascular disease, and its individual role and how it interacts with the other multiple toxicities are presented. The water-soluble B vitamins (especially folate and cobalamin-vitamin B12 have been shown to lower HHcy. The absence of the cystathionine beta synthase enzyme in human vascular cells contributes to the importance of a dual role of folic acid in lowering tHcy through remethylation, as well as, its action of being an electron and hydrogen donor to the essential cofactor tetrahydrobiopterin. This folate shuttle facilitates the important recoupling of the uncoupled endothelial nitric oxide synthase enzyme reaction and may restore the synthesis of the omnipotent endothelial nitric oxide to the vasculature.

  9. OSAHS合并高血压患者血浆同型半胱氨酸水平相关研究%Study on plasma homocysteine level in obstructive sleep apnea hypopnea syndrome combined with hypertension patients

    Institute of Scientific and Technical Information of China (English)

    方雁; 郝青林; 李珊珊

    2015-01-01

    目的:通过观察阻塞型睡眠呼吸暂停低通气综合征(obstructive sleep apnea hypopnea syndrome,OSAHS)及OSAHS合并高血压对血浆同型半胱氨酸(homocysteine,HCY)水平的影响,探讨血浆HCY水平与OSAHS严重程度及血压的相关性。方法选择115例无其他基础疾病的住院或门诊患者,将所有研究对象根据有无OSAHS及高血压分成3组:单纯鼾症(血压正常)组19例,OSAHS血压正常组55例,OSAHS合并高血压组41例,经整夜多导睡眠监测(PSG)后晨起测定空腹血浆HCY水平,将检测结果与睡眠呼吸监测指标进行相关性分析。结果3组之间HCY水平比较,OSAHS合并高血压组最高,OSAHS血压正常组次之,单纯鼾症组最低,差异有统计学意义(P0.05)。进行多重线性回归分析显示:AHI和呼吸暂停总次数与HCY较其他变量具有更显著的线性回归关系,对HCY水平影响最大,差异有统计学意义(P0.05). Multiple linear regression analysis showed that apnea total number and AHI had more remarkably relationship than other variable with HCY level, the difference was statistically significant (P<0.05). Conclusion Blood pressure is positively correlated with HCY, the high HCY levels may be an independent risking factor of hypertension. With sleep-related breathing disorder degree of OSAHS aggravating, the plasma HCY level elevates, detection of HCY levels can predict the severity of OSAHS as auxiliary index.

  10. Levels of Key Enzymes of Methionine-Homocysteine Metabolism in Preeclampsia

    Directory of Open Access Journals (Sweden)

    Alejandra Pérez-Sepúlveda

    2013-01-01

    Full Text Available Objective. To evaluate the role of key enzymes in the methionine-homocysteine metabolism (MHM in the physiopathology of preeclampsia (PE. Methods. Plasma and placenta from pregnant women (32 controls and 16 PE patients were analyzed after informed consent. Protein was quantified by western blot. RNA was obtained with RNA purification kit and was quantified by reverse transcritase followed by real-time PCR (RT-qPCR. Identification of the C677T and A1298C methylenetetrahydrofolate reductase (MTHFR single-nucleotide polymorphisms (SNPs and A2756G methionine synthase (MTR SNP was performed using PCR followed by a high-resolution melting (HRM analysis. S-adenosyl methionine (SAM and S-adenosyl homocysteine (SAH were measured in plasma using high-performance liquid chromatography-tandem mass spectrometry (HPLC/MS/MS. The SNP association analysis was carried out using Fisher’s exact test. Statistical analysis was performed using a Mann-Whitney test. Results. RNA expression of MTHFR and MTR was significantly higher in patients with PE as compared with controls. Protein, SAM, and SAH levels showed no significant difference between preeclamptic patients and controls. No statistical differences between controls and PE patients were observed with the different SNPs studied. Conclusion. The RNA expression of MTHFR and MTR is elevated in placentas of PE patients, highlighting a potential compensation mechanism of the methionine-homocysteine metabolism in the physiopathology of this disease.

  11. Retinal Ganglion Cell Loss in Diabetes Associated with Elevated Homocysteine

    Directory of Open Access Journals (Sweden)

    Kenneth S. Shindler

    2009-11-01

    Full Text Available A number of studies have suggested that homocysteine may be a contributing factor to development of retinopathy in diabetic patients based on observed correlations between elevated homocysteine levels and the presence of retinopathy. The significance of such a correlation remains to be determined, and potential mechanisms by which homocysteine might induce retinopathy have not been well characterized. Ganapathy and colleagues1 used mutant mice that have endogenously elevated homocysteine levels due to heterozygous deletion of the cystathionine-β-synthase gene to examine changes in retinal pathology following induction of diabetes. Their finding that elevated homocysteine levels hastens loss of cells in the retinal ganglion cell layer suggests that toxicity to ganglion cells may warrant further investigation as a potential mechanism of homocysteine enhanced susceptibility to diabetic retinopathy.

  12. Effects of fruit and vegetable consumption on total antioxidant capacity of fasting and postprandial plasma samples

    DEFF Research Database (Denmark)

    Ravn-Haren, Gitte; Dragsted, L. O.; Pedersen, A.

    2001-01-01

    Fruits and vegetables are known to protect against cancer and heart disease. This is often ascribed to their high content of antioxidants. We have therefore tested whether a daily intake of fruits and vegetables corresponding to the recommended 600 g had any effect on the antioxidant activity of ...... of fasting and postprandial plasma samples. Antioxidant activity was determined by the Trolox Equivalent Antioxidant Capacity (TEAC) assay and the Ferric Reducing Ability of Plasma (FRAP) assay, which have been reported to be affected by the presence of dietary antioxidants....

  13. B vitamins, homocysteine and bone health.

    Science.gov (United States)

    Fratoni, Valentina; Brandi, Maria Luisa

    2015-03-30

    Nutrition is one of the most important modifiable factors involved in the development and maintenance of good bone health. Calcium and Vitamin D have confirmed and established roles in the maintenance of proper bone health. However, other nutritional factors could also be implicated. This review will explore the emerging evidence of the supporting role of certain B Vitamins as modifiable factors associated with bone health. Individuals with high levels of homocysteine (hcy) exhibit reduced bone mineral density (BMD), alteration in microarchitecture and increased bone fragility. The pathophysiology caused by high serum homocysteine is not completely clear regarding fractures, but it may involve factors, such as bone mineral density, bone turnover, bone blood flow and collagen cross-linking. It is uncertain whether supplementation with B Vitamins, such as folate, Vitamin B1, and Vitamin B6, could decrease hip fracture incidence, but the results of further clinical trials should be awaited before a conclusion is drawn.

  14. Nitrite-induced methemoglobinaemia affects blood ionized and total magnesium level by hydrolysis of plasma adenosine triphosphate in rat.

    Science.gov (United States)

    Rahman, Md Mizanur; Kim, Shang-Jin; Kim, Gi-Beum; Hong, Chul-Un; Lee, Young-Up; Kim, Sung-Zoo; Kim, Jin-Shang; Kang, Hyung-Sub

    2009-11-01

    The objective of this study was to evaluate the effects of sodium nitrite (NaNO(2))-induced methemoglobinaemia on plasma ATP (adenosine triphosphate) and corresponding changes of blood-ionized magnesium (iMg(2+)) as well as total magnesium (tMg(2+)) in a time-dependent manner. This study was performed on male Sprague-Dawley rats to which NaNO(2) was injected (10 mg/kg i.p.) to induce methemoglobinaemia. Methemoglobin (MetHb) in blood was measured before (0 min.) and after 10, 30, 60 and 120 min. of NaNO(2) injection. At respective time points, the tMg(2+), blood ions and gases were measured by atomic absorption spectrometry and ion selective electrode, respectively. Haematological parameters were checked by automatic blood cell count, and blood films were observed under light microscope. Plasma ATP was measured by bioluminescence assay using a luminometer, and plasma proteins were measured by an automatic analyser. Blood cell count (RBC, WBC and platelet), haematocrit, and haemoglobin were found to be decreased with the advancement of MetHb concentration. With the gradual increase of MetHb concentration, the plasma ATP decreased and blood iMg(2+) and plasma tMg(2+) increased significantly as time passed by in comparison with the pre-drug values. A significant decrease of the ratio of ionized calcium to iMg(2+), Na(+) and increase of K(+) was observed. In conclusion, NaNO(2)-induced methemoglobinaemia is a cause of hydrolysis of plasma ATP which is responsible for the increase of blood iMg(2+) and plasma tMg(2+) in rats.

  15. The effect of an induced copper deficiency on the total plasma ...

    African Journals Online (AJOL)

    decline in the plasma copper concentration from 160 fLg/dlto 56 fLg/dlwas achieved. Further indications ... that the need for copper is higher for reproduction than for normal body maintenance. Die effek van 'n ..... Trace elements in Human and.

  16. Changes in total plasma and serum N-glycome composition and patient-controlled analgesia after major abdominal surgery.

    Science.gov (United States)

    Gudelj, Ivan; Baciarello, Marco; Ugrina, Ivo; De Gregori, Manuela; Napolioni, Valerio; Ingelmo, Pablo M; Bugada, Dario; De Gregori, Simona; Đerek, Lovorka; Pučić-Baković, Maja; Novokmet, Mislav; Gornik, Olga; Saccani Jotti, Gloria; Meschi, Tiziana; Lauc, Gordan; Allegri, Massimo

    2016-08-09

    Systemic inflammation participates to the complex healing process occurring after major surgery, thus directly affecting the surgical outcome and patient recovery. Total plasma N-glycome might be an indicator of inflammation after major surgery, as well as an anti-inflammatory therapy response marker, since protein glycosylation plays an essential role in the inflammatory cascade. Therefore, we assessed the effects of surgery on the total plasma N-glycome and the association with self-administration of postoperative morphine in two cohorts of patients that underwent major abdominal surgery. We found that plasma N-glycome undergoes significant changes one day after surgery and intensifies one day later, thus indicating a systemic physiological response. In particular, we observed the increase of bisialylated biantennary glycan, A2G2S[3,6]2, 12 hours after surgery, which progressively increased until 48 postoperative hours. Most changes occurred 24 hours after surgery with the decrease of most core-fucosylated biantennary structures, as well as the increase in sialylated tetraantennary and FA3G3S[3,3,3]3 structures. Moreover, we observed a progressive increase of sialylated triantennary and tetraantennary structures two days after surgery, with a concomitant decrease of the structures containing bisecting N-acetylglucosamine along with bi- and trisialylated triantennary glycans. We did not find any statistically significant association between morphine consumption and plasma N-glycome.

  17. Association of Methylentetraydrofolate Reductase (MTHFR 677 C > T gene polymorphism and homocysteine levels in psoriasis vulgaris patients from Malaysia: a case-control study

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    Liew Siaw C

    2012-01-01

    Full Text Available Abstract Background The methylenetetrahydrofolate reductase (MTHFR enzyme catalyzes the reduction of 5, 10-methylenetetrahydrofolate to 5-methyltetrahydrofolate and methyl donors. The methyl donors are required for the conversion of homocysteine to methionine. Mutation of MTHFR 677 C > T disrupts its thermostability therefore leads to defective enzyme activities and dysregulation of homocysteine levels. Methods This case-control study (n = 367 was conducted to investigate the correlation of the MTHFR gene polymorphism [NM_005957] and psoriasis vulgaris amongst the Malaysian population. Overnight fasting blood samples were collected from a subgroup of consented psoriasis vulgaris patients and matched controls (n = 84 for the quantification of homocysteine, vitamin B12 and folic acid levels. Results There was no significant increase of the MTHFR 677 C > T mutation in patients with psoriasis vulgaris compared with controls (χ2 = 0.733, p = 0.392. No significant association between homocysteine levels and MTHFR gene polymorphism in cases and controls were observed (F = 0.91, df = 3, 80, p = 0.44. However, homocysteine levels in cases were negatively correlated with vitamin B12 (r = -0.173 and folic acid (r = -0.345 levels. Vitamin B12 and folic acid levels in cases were also negatively correlated (r = -0.164. Conclusions Our results indicate that there was no significant association between the MTHFR gene polymorphism and psoriasis vulgaris in the Malaysian population. There was no significant increase of the plasma homocysteine level in the psoriasis patients compared to the controls.

  18. N- and O-linked glycosylation of total plasma glycoproteins in galactosemia.

    Science.gov (United States)

    Liu, Ying; Xia, Baoyun; Gleason, Tyler J; Castañeda, Uriel; He, Miao; Berry, Gerard T; Fridovich-Keil, Judith L

    2012-08-01

    Classic galactosemia is a potentially lethal metabolic disorder that results from profound impairment of the enzyme galactose-1-phosphate uridylyltransferase (GALT); despite decades of research, the underlying mechanism of pathophysiology remains unclear. Previous studies of plasma and tissue samples from patients with classic galactosemia have revealed defects of protein and lipid glycosylation, however, the underlying bases for these defects and their clinical significance, if any, has remained unclear. As a step toward addressing these questions we characterized both the N- and O-linked glycomes of plasma proteins from neonates, infants, children, and adults with galactosemia using mass spectrometry and asked (1) whether similar or disparate defects exist for N-linked and O-linked modifications, (2) what factors correlate with the severity of these defects in different patients, and perhaps most important, (3) whether there is any apparent relationship between chronic glycosylation defects and long-term outcome in patients. We found that some but not all of the galactosemic neonates tested exhibited abnormal N- and O-linked glycosylation of plasma proteins. The types of abnormalities seen were similar between N- and O-linked moieties, but the extent of the defects varied between patients. Age, gender, GALT genotype, and predicted residual GALT activity all failed to explain the extent of the glycosylation defect in the samples studied. Dietary galactose restriction markedly normalized both the N- and O-linked glycosylation patterns for all infants tested; however, any remaining glycosylation defects evident in the plasma of older children or adults on galactose-restricted diets showed no correlation with clinical outcome. These data cannot rule out the possibility that subtle or localized glycosylation defects, not detectable by our methods or not reflected in plasma, may contribute to acute or long-term outcome severity.

  19. Homocysteine in Gestational Diabetes and Normal Pregnancy plus Effects of Folic Acid

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    F Davari-Tanha

    2008-09-01

    Full Text Available "nBackground: The aim of study was to assess serum homocysteine and its relation with serum folate, vit B12 and lipid pro­files in gestational diabetes mellitus and comparison with normal pregnant women as well as effect of different doses of fo­lic acid on Homocysteine (Hcy and pregnancy outcome."nMethods:  In a biphasic study first prospective controlled study 80 pregnant women were chosen at 24-28 weeks of gesta­tion. In case group pregnant women with gestational diabetes mellitus and control group who had normal Oral Glucose Toler­ance test (GTT results. Levels of fasting glucose, homocysteine, vit B12, and folic acid, uric acid, total cholesterol, triglyc­eride, LDL, HDL, were measured. In phase II study a randomized clinical trial was done with diabetic women 15 with 1mg folic acid and 15 with 5 mg folic acid for six weeks and then above variables and pregnancy outcome was evalu­ated."nResults: The mean levels of homocysteine in Gestational Diabetes Mellitus (GDM group were significantly higher but fo­lic acid and vit B12 were significantly lower. Hcy levels were decreased in both groups after six weeks folic acid but de­crease in Hcy for group 5mg was significantly more than 1mg group. "nConclusion: Homocysteine levels were higher in GDM than normal pregnancy. High dose folic acid can reduce Hcy levels more than low dose and it may be a safe, simple, inexpensive intervention that prevents major pregnancy complications. "n 

  20. Creatine prevents the imbalance of redox homeostasis caused by homocysteine in skeletal muscle of rats.

    Science.gov (United States)

    Kolling, Janaína; Scherer, Emilene B S; Siebert, Cassiana; Marques, Eduardo Peil; Dos Santos, Tiago Marcom; Wyse, Angela T S

    2014-07-15

    Homocystinuria is a neurometabolic disease caused by severe deficiency of cystathionine beta-synthase activity, resulting in severe hyperhomocysteinemia. Affected patients present several symptoms including a variable degree of motor dysfunction, being that the pathomechanism is not fully understood. In the present study we investigated the effect of chronic hyperhomocysteinemia on some parameters of oxidative stress, namely 2'7'dichlorofluorescein (DCFH) oxidation, levels of thiobarbituric acid-reactive substances (TBARS), antioxidant enzyme activities (SOD, CAT and GPx), reduced glutathione (GSH), total sulfhydryl and carbonyl content, as well as nitrite levels in soleus skeletal muscle of young rats subjected to model of severe hyperhomocysteinemia. We also evaluated the effect of creatine on biochemical alterations elicited by hyperhomocysteinemia. Wistar rats received daily subcutaneous injection of homocysteine (0.3-0.6 μmol/g body weight), and/or creatine (50mg/kg body weight) from their 6th to the 28th days age. Controls and treated rats were decapitated at 12h after the last injection. Chronic homocysteine administration increased 2'7'dichlorofluorescein (DCFH) oxidation, an index of production of reactive species and TBARS levels, an index of lipoperoxidation. Antioxidant enzyme activities, such as SOD and CAT were also increased, but GPx activity was not altered. The content of GSH, sulfhydril and carbonyl were decreased, as well as levels of nitrite. Creatine concurrent administration prevented some homocysteine effects probably by its antioxidant properties. Our data suggest that the oxidative insult elicited by chronic hyperhomocystenemia may provide insights into the mechanisms by which homocysteine exerts its effects on skeletal muscle function. Creatine prevents some alterations caused by homocysteine.

  1. Levels of serum homocysteine in depressive patients Self-correlation factor analysis and comparison with healthy subjects

    Institute of Scientific and Technical Information of China (English)

    Shanxin Wang; Bin Wang; Aihua Yin; Yang Wang

    2008-01-01

    BACKGROUND: Data indicate that the levels of serum homocysteine in depressive patients are higher than those in normal subjects. OBJECTIVE: To investigate the levels of serum homocysteine in patients with major depressive disorder, to determine whether serum homocysteine levels differ with sex, family history, or drug treatment, and to compare depressive patients with normal subjects. DESIGN: Non-randomized concurrent control trial.SETTING: Mental Heath Center of Shandong Province.PARTICIPANTS: Forty in-patients (23 males and 17 females, 18-63 years old) with major depressive disorder were selected from the Mental Health Center of Shandong Province from January to October 2006. All selected patients met the depressive diagnostic standard of Chinese Classification of Mental Disorder (3rd Edition, CCMD-3), and total scores evaluated by the 17-item Hamilton Rating Scale for Depression (HRSD) were ≥ 20. Meanwhile, 36 healthy subjects (20 males and 16 females, 18-60 years old) were enrolled as controls; their total 17-item HRSD scores were ≤ 7. All selected subjects provided consent, and the study was approved by the local ethics committee. METHODS: Fasting venous blood (3 mL) was drawn in both groups at 8:00 in the morning. The levels of serum homocysteine were determined by a fluorescence polarization immunoassay (FPIA). The 17-item HRSD was also compiled from the patients when entering groups. The higher the scores were, the more severe the depression was. Enumeration data for both groups were compared by Chi-square test, measurement data were compared by t-test, and correlations were detected using Pearson and Spearman correlation analysis.MAIN OUTCOME MEASURES: ① Levels of serum homocysteine; ② incidence of hyperhomocysteinemia (Hhcy); ③ correlation between HRSD17 scores and levels of serum homocysteine in depressive patients.RESULTS: Forty depressive patients and 36 control subjects were included in the final analysis without any loss of participants.

  2. 叶酸对老年H型高血压患者血浆同型半胱氨酸和hs-CRP水平及心血管事件的影响%Effect of folic acid supplementation on the levels of plasma homocysteine,hs-CRP and cadiovascular events in elderly patients with type H hypertension

    Institute of Scientific and Technical Information of China (English)

    唐岚

    2016-01-01

    Objective To investigate the effect of folic acid supplementation on the levels of plasma homocysteine , high-sensitivity C-reactive protein ( hs-CRP) and cadiovascular events in elderly patients with type H hypertension in order to provide scientific basis for the treatment of the disease .Methods One hundred and twenty elderly patients with type H hypertension were randomly divided into intervention group ( n =60 ) and control group ( n =60 ) .The patients in control group were treated by routine therapy ,however,the patients in intervention group ,on the basis of conventional antihypertensive treatment, were treated by folic acid.The levels of plasma homocysteine (Hcy), inflammatory factor-hs-CRP and incidence of cardiovascular events were detected and observed ,finally, the results were analyzed by means of receiver operating curve ( ROC) .Results After 12-week treatment , the levels of plasma Hcy and hs-CRP in intervention group were significantly decreased,as compared with those in control group ( P <0.05).The incidence (8.33%) of cardiovascular events in intervention group was significantly lower than that (23.33%) in control group ( P <0.05).There was significant difference in the area under ROC curve between two groups (0.7454,0.6326~0.8583, P <0.01), when plasma levels of Hcy was equal to 24.83μmol/L, the sensitivity was 69.31% and specificity was 78.95%.Conclusion Folic acid combined with antihypertensive therapy can significantly reduce plasma levels of Hcy and plasma inflammatory factors , and can decrease the incidence of cardiovascular events in elderly patients with type H hypertension ,moreover ,plasma levels of Hcy are of important predictive value for predicting the incidence of cardiovascular events ,thus,we should pay much attention to monitoring plasma levels of Hcy in order to actively prevent cardiovascular events .%目的:研究叶酸及常规治疗H型高血压患者后,血浆同型半胱氨酸( Hcy)、高敏C-反应蛋白( hs

  3. Polymorphisms in MTHFR, MS and CBS genes and homocysteine levels in a Pakistani population.

    Science.gov (United States)

    Yakub, Mohsin; Moti, Naushad; Parveen, Siddiqa; Chaudhry, Bushra; Azam, Iqbal; Iqbal, Mohammad Perwaiz

    2012-01-01

    Hyperhomocysteinemia (>15 µmol/L) is highly prevalent in South Asian populations including Pakistan. In order to investigate the genetic determinants of this condition, we studied 6 polymorphisms in genes of 3 enzymes--methylenetetrahydrofolate reductase (MTHFR; C677T; A1298C), methionine synthase (MS; A2756G), cystathionine-β-synthase (CBS; T833C/844ins68, G919A) involved in homocysteine metabolism and investigated their interactions with nutritional and environmental factors in a Pakistani population. In a cross-sectional survey, 872 healthy adults (355 males and 517 females; age 18-60 years) were recruited from a low-income urban population in Karachi. Fasting venous blood was obtained and assessed for plasma/serum homocysteine; folate, vitamin B12, pyridoxal phosphate and blood lead. DNA was isolated and genotyping was performed by PCR-RFLP (restriction-fragment-length-polymorphism) based assays. The average changes in homocysteine levels for MTHFR 677CT and TT genotypes were positive [β(SE β), 2.01(0.63) and 16.19(1.8) µmol/L, respectively]. Contrary to MTHFR C677T polymorphism, the average changes in plasma homocysteine levels for MS 2756AG and GG variants were negative [β(SE β), -0.56(0.58) and -0.83(0.99) µmol/L, respectively]. The average change occurring for CBS 844ins68 heterozygous genotype (ancestral/insertion) was -1.88(0.81) µmol/L. The combined effect of MTHFR C677T, MS A2756G and CBS 844ins68 genotypes for plasma homocysteine levels was additive (p value CBS 844ins68 compared to homozygous ancestral type [OR (95% CI); 0.58 (0.34-0.99)]. Individuals with MTHFR 677CT or TT genotypes were at a greater risk of hyperhomocysteinemia in folate and vitamin B12 deficiencies and high blood lead (p value <0.05) level. Gene polymorphism (especially MTHFR C677T transition), folate and vitamin B12 deficiencies, male gender and high blood lead level appear to be contributing towards the development of hyperhomocysteinemia in a Pakistani population.

  4. Polymorphisms in MTHFR, MS and CBS genes and homocysteine levels in a Pakistani population.

    Directory of Open Access Journals (Sweden)

    Mohsin Yakub

    Full Text Available BACKGROUND: Hyperhomocysteinemia (>15 µmol/L is highly prevalent in South Asian populations including Pakistan. In order to investigate the genetic determinants of this condition, we studied 6 polymorphisms in genes of 3 enzymes--methylenetetrahydrofolate reductase (MTHFR; C677T; A1298C, methionine synthase (MS; A2756G, cystathionine-β-synthase (CBS; T833C/844ins68, G919A involved in homocysteine metabolism and investigated their interactions with nutritional and environmental factors in a Pakistani population. METHODOLOGY/PRINCIPAL FINDINGS: In a cross-sectional survey, 872 healthy adults (355 males and 517 females; age 18-60 years were recruited from a low-income urban population in Karachi. Fasting venous blood was obtained and assessed for plasma/serum homocysteine; folate, vitamin B12, pyridoxal phosphate and blood lead. DNA was isolated and genotyping was performed by PCR-RFLP (restriction-fragment-length-polymorphism based assays. The average changes in homocysteine levels for MTHFR 677CT and TT genotypes were positive [β(SE β, 2.01(0.63 and 16.19(1.8 µmol/L, respectively]. Contrary to MTHFR C677T polymorphism, the average changes in plasma homocysteine levels for MS 2756AG and GG variants were negative [β(SE β, -0.56(0.58 and -0.83(0.99 µmol/L, respectively]. The average change occurring for CBS 844ins68 heterozygous genotype (ancestral/insertion was -1.88(0.81 µmol/L. The combined effect of MTHFR C677T, MS A2756G and CBS 844ins68 genotypes for plasma homocysteine levels was additive (p value <0.001. Odds of having hyperhomocysteinemia with MTHFR 677TT genotype was 10-fold compared to MTHFR 677CC genotype [OR (95%CI; 10.17(3.6-28.67]. Protective effect towards hyperhomocysteinemia was observed with heterozygous (ancestral/insertion genotype of CBS 844ins68 compared to homozygous ancestral type [OR (95% CI; 0.58 (0.34-0.99]. Individuals with MTHFR 677CT or TT genotypes were at a greater risk of hyperhomocysteinemia in folate and

  5. Methylenetetrahydrofolate reductase gene, homocysteine and coronary artery disease: the A1298C polymorphism does matter. Inferences from a case study (Madeira, Portugal).

    Science.gov (United States)

    Freitas, Ana I; Mendonça, Isabel; Guerra, Graça; Brión, Maria; Reis, Roberto P; Carracedo, Angel; Brehm, António

    2008-01-01

    Elevated levels of plasma homocysteine, an independent risk factor and a strong predictor of mortality in patients with coronary artery disease (CAD), can result from nutritional deficiencies or genetic errors, including methylenetetrahydrofolate reductase (MTHFR) C677T and A1298C polymorphisms. The contribution of these polymorphisms in the development of CAD remains controversial. We analysed the impact of MTHFR C677T and A1298C on fasting homocysteine and CAD in 298 CAD patients proved by angiography and 510 control subjects from the Island of Madeira (Portugal). After adjustment for other risk factors, plasma homocysteine remained independently correlated with CAD. Serum homocysteine was significantly higher in individuals with 677TT and 1298AA genotypes. There was no difference in the distribution of MTHFR677 genotypes between cases and controls but a significant increase in 1298AA prevalence was found in CAD patients. In spite of the clear effect of C677T mutation on elevated homocysteine levels we only found an association between 1298AA genotype and CAD in this population. The simultaneous presence of 677CT and 1298AA genotypes provides a significant risk of developing the disease, while the 1298AC genotype, combined with 677CC, shows a significant trend towards a decrease in CAD occurrence. The data shows an independent association between elevated levels of homocysteine and CAD. Both MTHFR polymorphisms are associated with increased fasting homocysteine (677TT and 1298AA genotypes), but only the 1298AA variant shows an increased prevalence in CAD group. Odds ratio seem to indicate that individuals with the MTHFR 1298AA genotype and the 677CT/1298AA compound genotype had a 1.6-fold increased risk for developing CAD suggesting a possible association of MTHFR polymorphisms with the risk of CAD in Madeira population.

  6. Status of B-vitamins and homocysteine in diabetic retinopathy: association with vitamin-B12 deficiency and hyperhomocysteinemia.

    Science.gov (United States)

    Satyanarayana, Alleboena; Balakrishna, Nagalla; Pitla, Sujatha; Reddy, Paduru Yadagiri; Mudili, Sivaprasad; Lopamudra, Pratti; Suryanarayana, Palla; Viswanath, Kalluru; Ayyagari, Radha; Reddy, Geereddy Bhanuprakash

    2011-01-01

    Diabetic retinopathy (DR) is a common cause of blindness. Although many studies have indicated an association between homocysteine and DR, the results so far have been equivocal. Amongst the many determinants of homocysteine, B-vitamin status was shown to be a major confounding factor, yet very little is known about its relationship to DR. In the present study, we, therefore, investigated the status of B-vitamins and homocysteine in DR. A cross-sectional case-control study was conducted with 100 normal control (CN) subjects and 300 subjects with type-2 diabetes (T2D). Of the 300 subjects with T2D, 200 had retinopathy (DR) and 100 did not (DNR). After a complete ophthalmic examination including fundus fluorescein angiography, the clinical profile and the blood levels of all B-vitamins and homocysteine were analyzed. While mean plasma homocysteine levels were found to be higher in T2D patients compared with CN subjects, homocysteine levels were particularly high in the DR group. There were no group differences in the blood levels of vitamins B1 and B2. Although the plasma vitamin-B6 and folic acid levels were significantly lower in the DNR and DR groups compared with the CN group, there were no significant differences between the diabetes groups. Interestingly, plasma vitamin-B12 levels were found to be significantly lower in the diabetes groups compared with the CN group; further, the levels were significantly lower in the DR group compared with the DNR group. Higher homocysteine levels were significantly associated with lower vitamin-B12 and folic acid but not with other B-vitamins. Additionally, hyperhomocysteinemia and vitamin-B12 deficiency did not seem to be related to subjects' age, body mass index, or duration of diabetes. These results thus suggest a possible association between vitamin-B12 deficiency and hyperhomocysteinemia in DR. Further, the data indicate that vitamin-B12 deficiency could be an independent risk factor for DR.

  7. Speed associated with plasma pH, oxygen content, total protein and urea in an 80 km race.

    Science.gov (United States)

    Hoffman, R M; Hess, T M; Williams, C A; Kronfeld, D S; Griewe-Crandell, K M; Waldron, J E; Graham-Thiers, P M; Gay, L S; Splan, R K; Saker, K E; Harris, P A

    2002-09-01

    To test the hypothesis that endurance performance may be related quantitatively to changes in blood, we measured selected blood variables then determined their reference ranges and associations with speed during an 80 km race. The plan had 46 horses in a 2 x 2 factorial design testing a potassium-free electrolyte mix and a vitamin supplement. Blood samples were collected before the race, at 21, 37, 56 and 80 km, and 20 min after finishing, for assay of haematocrit, plasma pH, pO2, pCO2, [Na+], [K+], [Ca++], [Mg++], [Cl-], lactate, glucose, urea, cortisol, alpha-tocopherol, ascorbate, creatine kinase, aspartate amino transferase, lipid hydroperoxides, total protein, albumin and creatinine, and erythrocyte glutathione and glutathione peroxidase. Data from 34 finishers were analysed statistically. Reference ranges for resting and running horses were wide and overlapping and, therefore, limiting with respect to evaluation of individual horses. Speed correlations were most repeatable, with variables reflecting blood oxygen transport (enabling exercise), acidity and electrolytes (limiting exercise) and total protein (enabling then, perhaps, limiting). Stepwise regressions also included plasma urea concentration (limiting). The association of speed with less plasma acidity and urea suggests the potential for fat adaptation and protein restriction in endurance horses, as found previously in Arabians performing repeated sprints. Conditioning horses fed fat-fortified and protein-restricted diets may not only improve performance but also avoid grain-associated disorders.

  8. Homocysteine level in Iranian patients with premature acute myocardial infarction

    Institute of Scientific and Technical Information of China (English)

    Mohammad Shojaie; Farzan Naghshvar; Hamid Reza Izadi; Ahad Eshraghian; Morteza Pourahmad

    2009-01-01

    @@ Homocysteine may impair vascular endothelial cell function.Besides,it may also induce cell damage,smooth muscle cell proliferation,thrombogenesis and oxidation of low-density lipoproteins.1 The possible role of elevated blood concentrations of homocysteine in cardiovascular disease was firstly hypothesized after the observation of high incidence of premature occlusive vascular disease in children with homozygous homocystinuria.2

  9. Study of correlation between plasma asymmetric dimethyl arginine and homocysteine levels in patients with pre-eclampsia%先兆子痫患者血浆ADMA与同型半胱氨酸水平相关性研究

    Institute of Scientific and Technical Information of China (English)

    刘科鹏; 张笠; 柴虹; 高武; 韩跃武; 徐攀

    2014-01-01

    Objective To investigate the correlation between the plasma asymmetric dimethyl arginine(ADMA)and homocys-teine(Hcy)levels in the patients with pre-eclampsia and their relationship with pre-eclampsia.Methods Plasma ADMA and Hcy levels in 91 cases of pre-eclampsia were detected by enzyme-linked immunosorbent assay.80 healthy normotensive pregnant women were taken as the control group.Results The plasma ADMA level in the pre-eclampsia group was(0.625 ±0.186)μmol/L,which was significantly higher than(0.524±0.106)μmol/L in the control group(P <0.05);plasma Hcy level in the pre-eclampsia group was(12.447±6.134)μmol/L,which was significantly higher than(8.207 ±2.797)μmol/L in the control group(P <0.05).Plasma ADMA level was positively correlated with the Hcy level in the Pre-eclampsia group(r =0.623,P <0.05 ).Conclusion Plasma ADMA and Hcy levels in pre-eclampsia are elevated,which indicating that the increase of ADMA and Hcy is related with the occur-rence and development of pre-eclampsia,ADMA and Hcy are the risk factors of pre-eclampsia.%目的:探讨先兆子痫患者血浆不对称性二甲基精氨酸(asymmetric dimethylarginine,ADMA)水平与同型半胱氨酸(homocysteine,Hcy)水平的相关性,以及 ADMA、Hcy 水平与先兆子痫的关系。方法用酶联免疫吸附法检测91例先兆子痫患者血浆 ADMA 及血浆 Hcy 水平。以80例血压正常的健康孕妇为对照。结果先兆子痫组血浆 ADMA 水平(0.625±0.186μmol/L)显著高于对照组(0.524±0.106μmol/L)(P <0.05);先兆子痫组血浆 Hcy 水平(12.447±6.134μmol/L)显著高于对照组(8.207±2.797μmol/L)(P <0.05)。先兆子痫组血浆 ADMA 水平与 Hcy 水平呈正相关(r=0.623,P <0.05)。结论先兆子痫患者的血浆中不对称性二甲基精氨酸和同型半胱氨酸是升高的,这说明 ADMA 和 Hcy 的升高与先兆子痫的发生、发展有关, ADMA、Hcy 可能是先兆子痫的危险

  10. Vitamin B12, folate, homocysteine and urinary methylmalonic acid levels in infants.

    Science.gov (United States)

    Karademir, F; Suleymanoglu, S; Ersen, A; Aydinoz, S; Gultepe, M; Meral, C; Ozkaya, H; Gocmen, I

    2007-01-01

    Serum vitamin B12 and folate, and their functional markers, plasma homocysteine and urinary methylmalonate (uMMA) were measured in 204 healthy, term infants at birth, and at 2 and 6 months. Compared with infants receiving formula food, those fed mother's milk had lower vitamin B12 and folate at 2 and 6 months. In infants receiving mother's milk, vitamin B12 levels were similar at birth (238 pg/ml) and 2 months (243 pg/ml), whereas with formula milk the level was significantly higher at 2 months (558 pg/ml) than at birth (257 pg/ml). Vitamin B12 was negatively correlated with homocysteine at birth and 6 months. The level of uMMA (mmol/mol creatinine) was higher at 2 (mother's milk, 25.5; formula, 23.97) and 6 months (19.77; 15) than at birth (11.97; 10.88), and was not correlated with vitamin B12 levels. Homocysteine may be a reliable marker of vitamin B12 status in neonates and infants; however, uMMA is not suitable as a marker of vitamin B12 status.

  11. The Levels of Serum B12, Folic Acid and Homocysteine in the Thromboembolic Diseases

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    Keziban Ucar Karabulut

    2016-09-01

    Full Text Available Aim: The aim of this study was to examine the levels of serum B12, folic acid, and homocysteine at admission in the cases established at the emergency department with thrombo-embolic diseases and to compare them with healthy subjects and also compare the diagnosis groups with each other.Material and Method: This study included 100 subjects diagnosed at the emergency department between March 2009-May 2009 with acute myocardial infarction, acute pulmonary embolism, deep vein thrombosis, ischemic cerebrovascular disease, acute mesenteric embolism, peripheral artery embolism and 110 healthy voluntary subjects were included in the control group. Vitamin B12, folic acid, and homocysteine levels were examined in blood samples obtained at admission. Mann-Whitney U test was used to compare the patient and control group. Kruskal-Wallis variance analysis was used to compare the patient group, according to diagnosis. p%u2264 0.05 was considered as significant. Results: Mean serum homocysteine and plasma vitamin B12 levels were significantly higher in the patient group than control group (p=0.002, 0.000 respectively. Mean serum B12 values of acute myocardial infarction and Ischemic Cerebrovascular Disease groups in the patient group were significantly lower than those of the control group (p

  12. Lipid profile and levels of homocysteine, leptin, fibrinogen and C-reactive protein in hyperthyroid patients before and after treatment

    Directory of Open Access Journals (Sweden)

    Emine Sütken

    2010-03-01

    Full Text Available Objectives: The present study was carried out to determine whether thyroid hormones affect lipid profile and levels of erithrocyte sedimentation rate (ESR, serum total homocysteine (t-hcy, leptin, fibrinogen, C-reactive protein (CRP in patients with hyperthyroidism.Materials and methods: This study was carried out on 23 hyperthroid subjects (3 men / 20 women, mean age 41.8 ± 2.4 years. Serum levels of homocysteine, leptin, fibrinogen, CRP, total cholesterol (TC, high-density lipoprotein cholesterol (HDL-C, low-density lipoprotein cholesterol (LDL-C and ESR were measured and body mass index (BMI were calculated before and after treatment of hyperthyroidism.Results: Pretreatment t-hcy, TC, LDL-C, HDL-C levels and BMI of patients were significantly lower than those of the post-treatment (p<0.001, for each variable. However, fibrinogen and ESR decreased after the treatment (p<0.001 and p<0.05, respectively. There were no differences in leptin and CRP levels between pre- and post-treatment periods. Pre and post treatment TC and LDL-C levels were negatively correlated with free triiodothyronine (fT3 levels (r=-0.588, p<0.01; r=-0.534, p<0.01; r=-0.543, p<0.01 and r =-0.653, p<0.01, respectively. Pre-treatment HDL-C was inversely correlated with TSH (r=-0.423, p<0.05. Pre-post- treatment LDL-C was negatively correlated with free thyroxine (fT4 levels (r=-0.536, p<0.001 and r=- 0.422, p<0.05 respectively. Pre-treatment TC was inversely correlated with fT4 (r=-0.590, p<0.01.Conclusion: Hyperthyroidism is associated with high plasma fibrinogen and ESR levels. Elevated plasma fibrinogen and ESR levels may be a possible explanation for the high cardiovascular morbidity among hyperthyroidic subjects. These changes may reflect low-grade inflammation or disturbances in coagulation in hyperthyroidism.

  13. INFLUENCE OF CHRONIC EXERCISE ON RED CELL ANTIOXIDANT DEFENSE, PLASMA MALONDIALDEHYDE AND TOTAL ANTIOXIDANT CAPACITY IN HYPERCHOLESTEROLEMIC RABBITS

    Directory of Open Access Journals (Sweden)

    Mohsen Alipour

    2006-12-01

    Full Text Available Despite the knowledge on the antiatherogenic effects of exercise, the mechanism by which exercise reduces atherogenic risk remains unknown. In this study, we investigated the hypothesis that chronic exercise-induced oxidative stress may increase plasma total antioxidant capacity and antioxidant defense in the red cells. For 8 weeks, 60 male Dutch rabbits were fed rabbit chow with or without the addition of 2% cholesterol. The animals were further divided into rest and exercise groups (n = 15 for each group. Animals in exercise groups ran on a rodent treadmill at 15 m/min for 10 to 60 minutes gradually for 5 days per week for a total of 8 weeks. At the end of experiments, blood samples were collected and glutathione peroxidase (GPX, superoxide dismutase (SOD, and catalase (CAT activities were determined in red blood cells. Total antioxidant capacity (TAC, malondialdehyde (MDA and total thiol (T-SH levels were measured in plasma. Thoracic aorta and carotid arteries were isolated for histological examination to evaluate atherosclerosis. Eight weeks of chronic exercise reduced atherogenic diet-induced atherosclerotic lesions in all the arteries studied, along with positive changes in cholesterol profile, especially increase of serum HDL-C level. Plasma MDA, TAC and T-SH concentrations were enhanced by exercise in both control and hypercholesterolemic diet groups. Erythrocyte catalase activity was significantly increased by chronic exercise (p < 0.05, whereas total SOD activity rose with exercise only in the control group. Surprisingly, GPX activity was significantly reduced (P < 0.05 in response to exercise in the control group and also in the high cholesterol diet group. Exercise is a useful tool for the prevention and regression of atherosclerosis which is evident by our findings of the enhancement of plasma TAC and positive change in serum cholesterol profile. However, the effect of exercise on red cell antioxidant activities is limited in the

  14. Plasma total oxidant and antioxidant status after oral glucose tolerance and mixed meal tests in patients with polycystic ovary syndrome.

    Science.gov (United States)

    Kucukaydın, Zehra; Duran, Cevdet; Basaran, Mustafa; Camlica, Fatos; Erdem, Sami Said; Basaran, Ahmet; Kutlu, Orkide; Burnik, Ferda Sevimli; Elmas, Halis; Gonen, Mustafa Sait

    2016-10-01

    Insulin resistance (IR) and increased oxidative stress (OS) are the characteristics of polycystic ovary syndrome (PCOS). In this study, we aimed to evaluate the effects of oral glucose tolerance (OGTT) and mixed meal tests (MMT) on plasma total oxidant (TOS) and total antioxidant status (TAS) in patients with PCOS and the relationship between these parameters and IR, calculated via homeostasis of model assessment-IR (HOMA-IR) and Matsuda's insulin sensitivity index (ISI) derived from OGTT and MMT. Twenty-two patients with PCOS, and age- and body mass index (BMI)-matched 20 women as controls were enrolled into the study. Five-hour OGTT and MMT were performed on different days, and before and after these tests, plasma TOS and TAS levels were investigated. IR was calculated with HOMA-IR and Matsuda's ISI. HOMA-IR levels were higher in patients with PCOS, compared to controls, while Matsuda's ISI derived from OGTT and MMT was higher in controls. Plasma TOS levels before OGTT and MMT were higher in patients with PCOS than controls, while TAS levels were similar. After OGTT, plasma TOS levels became decreased at 5th hour, when compared to baseline values in PCOS group. Likewise, the same decrement was found in controls, but the decrement was not significant. After OGTT and MMT at 5th hour, no changes were observed in TAS levels, compared to baseline. Matsuda's ISIs derived from OGTT and MMT can be used instead of each other, and interestingly, we found a decrease in TOS levels after OGTT in patients with PCOS.

  15. Update on cobalamin, folate, and homocysteine.

    Science.gov (United States)

    Carmel, Ralph; Green, Ralph; Rosenblatt, David S; Watkins, David

    2003-01-01

    Three topics affecting cobalamin, folate, and homocysteine that have generated interest, activity, and advances in recent years are discussed. These are: (I). the application of an expanded variety of tools to the diagnosis of cobalamin deficiency, and how these affect and are affected by our current understanding of deficiency; (II). the nature of the interaction between homocysteine and vascular disease, and how the relationship is affected by vitamins; and (III). the improved understanding of relevant genetic disorders and common genetic polymorphisms, and how these interact with environmental influences. The diagnostic approach to cobalamin deficiency now allows better diagnosis of difficult and atypical cases and more confident rejection of the diagnosis when deficiency does not exist. However, the process has also become a complex and sometimes vexing undertaking. Part of the difficulty derives from the lack of a diagnostic gold standard among the many available tests, part from the overwhelming numerical preponderance of patients with subclinical deficiency (in which isolated biochemical findings exist without clinical signs or symptoms) among the cobalamin deficiency states, and part from the decreased availability of reliable tests to identify the causes of a patient's cobalamin deficiency and thus a growing deemphasis of that important part of the diagnostic process. In Section I, Dr. Carmel discusses the tests, the diagnostic issues, and possible approaches to the clinical evaluation. It is suggested no single algorithm fits all cases, some of which require more biochemical proof than others, and that differentiating between subclinical and clinical deficiency, despite their overlap, may be a helpful and practical point of departure in the evaluation of patients encountered in clinical practice. The arguments for and against a suggested expansion of the cobalamin reference range are also weighed. The epidemiologic data suggest that homocysteine elevation

  16. Struktur Mikroanatomi Hati dan Kadar Kolesterol Total Plasma Darah Tikus Putih Strain Wistar Pasca Suplementasi Minyak Lemuru dan Minyak Sawit

    Directory of Open Access Journals (Sweden)

    Ngudy Jaka Surasa

    2014-09-01

    Full Text Available Mengkonsumsi minyak lemuru dan minyak sawit secara terus menerus, diduga dapat menyebabkan kerusakan mikroanatomi hati. Penelitian ini bertujuan untuk mengetahui struktur mikroanatomi hati dan kadar kolesterol total plasma darah tikus putih strain Wistar paska suplementasi minyak lemuru dan minyak sawit. Penelitian ini merupakan penelitian eksperimental, dengan rancangan acak lengkap. Penelitian menggunakan 25 ekor tikus usia ± 3 bulan. Masing-masing diberi minyak sawit dan minyak lemuru sebanyak 0%+0%, 5%+5%, 10%+10%, 15%+15%, dan 20%+20% secara per oral selama 28 hari. Data kadar kolesterol total plasma darah, berat badan tikus dan berat hati tikus dianalisis secara kuantitatif menggunakan ANAVA satu arah, dengan tingkat kesalahan 5%. Hasil penelitian menunjukkan bahwa pemberian minyak sawit dan minyak lemuru bersifat toksik terhadap hati dan dapat menurunan kadar kolesterol total plasma darah. Sifat toksik minyak lemuru dan minyak sawit terhadap hati dapat dilihat dari adanya perubahan struktur mikroanatomi hati, makroskopis hati tikus, dan berat hati tikus. Kerusakan struktur mikroanatomi hati yang ditemukan berupa kerusakan sel hati (nekrosis hati serta melebarnya sinusoid. Kesimpulan penelitian ini adalah pemberian minyak sawit dan minyak lemuru mengakibatkan kerusakan mikroanatomi berupa nekrosis sel hati, sehingga mempengaruhi makroskopis hati (perubahan tekstur dan warna, berat hati, dan mempengaruhi berat badan tikus.Consuming lemuru oil and palm oil continuously could be expected to cause damage to the liver micro-anatomy. This study aimed to determine the micro-anatomy structure of liver and blood plasma total cholesterol level of white rats Wistar strain by post-oil supplementation of lemuru and palm oil. This research was experimental, with a completely randomized design. The research used 25 mice aged ± 3 months. Each was given a palm oil and lemuru oil as much as 0%+0%, 5%+5%, 10%+10%, 15%+15%, and 20%+20% orally for 28 days

  17. Combination of high-sensitivity C-reactive protein and homocysteine may predict an increased risk of coronary artery disease in Korean population

    Institute of Scientific and Technical Information of China (English)

    CHO Doo-Yeoun; KIM Kyu-Nam; KIM Kwang-Min; LEE Duck-Joo; KIM Bom-Taeck

    2012-01-01

    Background The association of emerging biomarkers such as high-sensitivity C-reactive protein (hs-CRP),homocysteine and fibrinogen with the risk of coronary artery disease (CAD) is still uncertain in Asian population including Koreans and little is known about the combined effect of biomarkers on the risk of CAD.Methods A total of 10 650 subjects (6538 men and 4112 women) were enrolled in this study.A 10-year CAD risk was calculated using Framingham risk score modified by the National Cholesterol Education Program (NCEP) Adult Treatment Panel Ⅲ (ATP Ⅲ ) and levels of circulating hs-CRP,homocysteine and fibrinogen were measured using validated assays.Results The 10-year CAD risk gradually augmented with increase in the circulating levels of hs-CRP,homocysteine and fibrinogen.For the highest quartile of hs-CRP,odds ratio (OR) of high-risk for CAD (10-year risk ≥20%) compared with the lowest quartile was 3.97 (95% C/:2.51-6.29).For homocysteine and fibrinogen,ORs in the highest quartile compared to the lowest quartile were 5.10 (95% Cl:3.05-8.53,P <0.001) and 1.46 (95% Cl:0.69-3.11,P=0.325),respectively.OR of high-risk for CAD in both the highest quartile of hs-CRP and homocysteine was 9.05 (95% CI:5.30-15.45) compared with the below median of hs-CRP and homocysteine.Conclusions The present study demonstrated that hs-CRP and homocysteine are well associated with the 10-year CAD risk estimated using NCEP ATP Ⅲ in Koreans and combination of hs-CRP and homocysteine can have strong synergyin predicting the development of CAD.

  18. Diurnal variation in total plasma tryptophan in controls and in depression.

    Science.gov (United States)

    Candito, M; Souêtre, E; Iordache, A; Pringuey, D; Ardisson, J L; Chambon, P; Darcourt, G

    1990-01-01

    Circadian rhythms of total tryptophan were investigated by assays of hourly blood samples over 25 h. The study population consisted of four endogenously depressed patients investigated in the absence of any treatment and six healthy controls. The abnormalities detected by statistical analyses in untreated depression consisted mainly of amplitude reduction; the phase positions of the depressed patients were similar to those of the controls.

  19. Dietary factors associated with plasma high molecular weight and total adiponectin levels in apparently healthy women

    NARCIS (Netherlands)

    Yannakoulia, Mary; Yiannakouris, Nikos; Melistas, Labros; Fappa, Evaggelia; Vidra, Nikoletta; Kontogianni, Meropi D; Mantzoros, Christos S

    2008-01-01

    OBJECTIVE: Our aim was to investigate associations between dietary factors and high molecular weight (HMW) as well as total adiponectin in a sample of apparently healthy adult Mediterranean women. DESIGN AND METHODS: Two hundred and twenty women were enrolled in this study. Anthropometric and body

  20. Association of maternal homocysteine and vitamins status with the risk of neural tube defects in Tunisia: A case-control study.

    Science.gov (United States)

    Nasri, Kaouther; Ben Fradj, Mohamed Kacem; Touati, Asma; Aloui, Mariem; Ben Jemaa, Nadia; Masmoudi, Aida; Elmay, Michèle Véronique; Omar, Souhail; Feki, Moncef; Kaabechi, Naziha; Marrakchi, Raja; Gaigi, Soumeya Siala

    2015-12-01

    This study was conducted to determine whether low folate and vitamin B12 levels, as well as high homocysteine levels in pregnant women are associated with neural tube defects (NTDs) in Tunisia. A total of 75 NTDs pregnancies and 75 matched controls were included in the study. Their vitamin B12, folate, and red blood cell folate concentrations were measured using a radio-immunoassay kit and total homocysteine concentrations were determined using a fluorescent polarization immunoassay. Vitamin B12 and folate concentrations were lower in NTD-affected pregnant women than in controls (respectively, p = 0.009 and p < 0.001). Total homocysteine concentration was significantly higher in the NTDs group than in controls (p = 0.008). In the case group, the folate levels were positively related with vitamin B12 levels (r = 0.54; p < 0.001) and negatively correlated with total homocysteine levels (r = -0.19; p = 0.04). Besides, red blood cell folate levels were positively correlated with folate levels (r = 0.24; p = 0.02) and negatively correlated with total homocysteine levels (r = -0.37; p = 0.001). Lower concentrations of folate and vitamin B12 are related to the increased risk of NTDs. Both folate and vitamin B12 intake insufficiency could contribute to the increased risk of NTDs. A dietary supplement, combining folate and vitamin B12, might be an effective measure to decrease the NTDs incidence in Tunisia. © 2015 Wiley Periodicals, Inc.

  1. Effect of L- carnitine on Serum Total Level of Homocysteine in Patients Undergoing Maintenance Hemodialysis%左卡尼汀对维持性血液透析患者血清总同型半胱氨酸的影响

    Institute of Scientific and Technical Information of China (English)

    解德琼; 杜一平; 刘牧; 曾立; 朱磊

    2009-01-01

    OBJECTIVE: To evaluate the effect of L-carnitine on serum total level of homocysteine (tHcy) in patients undergoing maintenance hemodialysis. METHODS: 60 patients undergoing maintenance hemodialysis were randomly divided into two groups (treatment group and control group): the patients in the treatment group were injected i.v. with 1.0 g of L-carnitine for 12 weeks, and those in the control group were injected i.v. with 5 mL normal saline for 12 weeks. Meanwhile,the healthy people were involved as normal control group(n =20) . tHcy was detected by ELISA method; the fasting insulin was detected by radio- immunity method. Fasting blood glucose, total cholesterol, triglyeride, HDL and LDL were detected by routine method. The reciprocal of the multiplication product between fasting blood glucose and insulin concentration were computed as insulin sensitivity index(ISI) . RESULTS: After treatment for 12 weeks, the treatment group showed increased ISI but significantly reduced tHcy (P< 0.05); however, no significant differences of ISI.tHcy were noted in the control group before and after treatment. CONCLUSION: Insulin resistance and high tHcy present in patients undergoing maintenance hemodialysis can be reversed by L - carnitine.%目的:探讨左卡尼汀对维持性血液透析患者血清总同型半胱氨酸(tHcy)水平的影响.方法:60例维持性血液透析患者随机分为2组,治疗组每次血液透析后静脉注射左卡尼汀1.0 g,对照组静脉注射5 mL生理盐水,疗程12周.另设20例门诊健康体检者为正常对照组.采用酶联免疫吸附(ELISA)法测定tHcy,放射免疫法测定空腹胰岛素,常规方法检测空腹血糖、总胆固醇、总甘油三酯、高密度脂蛋白、低密度脂蛋白,以空腹血糖与空腹胰岛素浓度水平乘积的倒数作为胰岛素敏感指数(ISI).结果:与治疗前比较,治疗组治疗12周后ISI明显提高,tHcy明显下降(P<0.05),对照组治疗前、后ISI、tHcy

  2. 妊娠妇女血清总同型半胱氨酸、叶酸和维生素B12水平分析%Analysis on the levels of serum total homocysteine, folic acid, and vitamin B12 in pregnant women

    Institute of Scientific and Technical Information of China (English)

    滕凯; 夏良萍; 李晓光

    2012-01-01

    目的:研究分析妊娠妇女血清总同型半胱氨酸(tHcy)、叶酸(FA)、维生素B12(Vit B12)水平以及与其相关疾病的关系.方法:选择正常妊娠285例、妊娠期高血压疾病81例、其他不良妊娠37例、非孕育龄健康对照98例,分别以比色法测定血清tHcy水平;化学发光法测定FA、Vit B12水平.结果:正常妊娠妇女tHcy、FA、Vit B12水平显著低于正常对照,差异有统计学意义(P <0.05或P<0.01);妊娠期高血压疾病、不良妊娠tHcy水平显著增高且与正常对照相比,差异有统计学意义(P<0.05);而妊娠期高血压疾病FA、Vit B12水平与正常妊娠相比,差异无统计学意义(P>0.05);不良妊娠FA、Vit B12水平与正常妊娠相比差异有统计学意义(P<0.05).结论:妊娠期高血压疾病、不良妊娠血清tHcy水平显著增高;低水平FA、Vit B12可能是不良妊娠的重要因素之一.%Objective: To research the levels of serum total homocysteine (tHcy) , folic acid, and vitamin B12 in pregnant women and the correlation with related diseases. Methods: A total of 285 cases of normal pregnancy, 81 cases of hypertensive disorder complicating pregnancy (HDCP) , 37 cases of other adverse pregnancy, and 98 healthy women without pregnancy (normal control group) were selected, then colorimetric method was used to detect serum tHcy level, chemiluminescence method was used to detect the serum levels of folic acid and vitamin B12. Results; The levels of serum tHcy, folic acid, and vitamin B12 in normal pregnancy group were statistically significantly lower than those in normal control group (P0. 05) ; there was statistically significant difference in serum levels of folic acid and vitamin B12 between adverse pregnancy group and normal pregnancy group ( P < 0. 05 ) . Conclusion; The serum levels of tHcy in patients with HDCP and adverse pregnancy increased significantly; low levels of folic acid and vitamin B12 may be important factors of adverse

  3. Impact of folic acid supplement on plasma homocysteine levels in patients with essential hypertensive in the community%补充叶酸对社区原发性高血压患者同型半胱氨酸的影响

    Institute of Scientific and Technical Information of China (English)

    吴旭华; 唐海沁; 朱咏清; 刘安银

    2016-01-01

    目的:了解叶酸对于社区原发性高血压患者同型半胱氨酸水平的影响。方法在两个功能社区内选取原发性高血压患者208名,采用随机数字法分配到干预组和对照组中,分别予以常规降压药物+叶酸(2.5 mg,2次/d)和常规降压药物,连续双盲治疗1年。于给药前测定两组 Hcy 水平并于治疗1年后进行随访同时测定 Hcy 水平。结果干预组治疗前基线血浆 Hcy 水平及常规降压药物+叶酸干预1年后血浆 Hcy 水平为[(15.3±4.6)μmol/L,(9.1±2.7)μmol/L],干预后 Hcy 水平较干预前明显降低(P <0.05);对照组治疗前后血浆 Hcy 水平为[(14.2±4.8)μmol/L,(14.9±4.7)μmol/L],差异无统计学意义(P >0.05),与干预组基线Hcy 水平比较,差异也无统计学意义。结论对于原发性高血压患者补充适当的叶酸能有效降低血 Hcy 水平,从而降低其心脑血管事件的发生率。%Objective To investigate the impact of adding folic acid to the standard antihypertensive medica-tion on plasma homocysteine(Hcy)levels in patients with essential hypertensive.Methods 208 essential hypertensive patients in community were randomly devided into two groups:group 1(standard medication),group 2(adding folic acid 2.5mg twice daily).Plasma Hcy level was deceted at baseline and one -year the therapy.Results There were no changes In group 1,the plasma Hcy level at baseline (14.2 ±4.8)μmol/L and the one-year therapy (14.9 ±4.7)μmol/L (all P >0.05).The plasma Hcy level was significantly decreased after the one-year treatment [(9.1 ±2.7)μmol/L VS.(15.3 ±4.6)μmol/L](all P <0.05)in group 2.Conclusions The supplementation of folic acid could significantly reduce plasma Hcy level,which may plays a positive role in the prevention of cardiovascular events.

  4. Analysis of bioethanol samples through Inductively Coupled Plasma Mass Spectrometry with a total sample consumption system

    Science.gov (United States)

    Sánchez, Carlos; Lienemann, Charles-Philippe; Todolí, Jose-Luis

    2016-10-01

    Bioethanol real samples have been directly analyzed through ICP-MS by means of the so called High Temperature Torch Integrated Sample Introduction System (hTISIS). Because bioethanol samples may contain water, experiments have been carried out in order to determine the effect of ethanol concentration on the ICP-MS response. The ethanol content studied went from 0 to 50%, because higher alcohol concentrations led to carbon deposits on the ICP-MS interface. The spectrometer default spray chamber (double pass) equipped with a glass concentric pneumatic micronebulizer has been taken as the reference system. Two flow regimes have been evaluated: continuous sample aspiration at 25 μL min- 1 and 5 μL air-segmented sample injection. hTISIS temperature has been shown to be critical, in fact ICP-MS sensitivity increased with this variable up to 100-200 °C depending on the solution tested. Higher chamber temperatures led to either a drop in signal or a plateau. Compared with the reference system, the hTISIS improved the sensitivities by a factor included within the 4 to 8 range while average detection limits were 6 times lower for the latter device. Regarding the influence of the ethanol concentration on sensitivity, it has been observed that an increase in the temperature was not enough to eliminate the interferences. It was also necessary to modify the torch position with respect to the ICP-MS interface to overcome them. This fact was likely due to the different extent of ion plasma radial diffusion encountered as a function of the matrix when working at high chamber temperatures. When the torch was moved 1 mm plasma down axis, ethanolic and aqueous solutions provided statistically equal sensitivities. A preconcentration procedure has been applied in order to validate the methodology. It has been found that, under optimum conditions from the point of view of matrix effects, recoveries for spiked samples were close to 100%. Furthermore, analytical concentrations for real

  5. Vascular complications of cystathionine β-synthase deficiency: future directions for homocysteine-to-hydrogen sulfide research

    OpenAIRE

    Richard S Beard; Bearden, Shawn E.

    2010-01-01

    Homocysteine (Hcy), a cardiovascular and neurovascular disease risk factor, is converted to hydrogen sulfide (H2S) through the transsulfuration pathway. H2S has attracted considerable attention in recent years for many positive effects on vascular health and homeostasis. Cystathionine β-synthase (CBS) is the first, and rate-limiting, enzyme in the transsulfuration pathway. Mutations in the CBS gene decrease enzymatic activity, which increases the plasma Hcy concentration, a condition called h...

  6. Determination of total tin in canned food using inductively coupled plasma atomic emission spectroscopy

    Energy Technology Data Exchange (ETDEWEB)

    Perring, Loic; Basic-Dvorzak, Marija [Department of Quality and Safety Assurance, Nestle Research Centre, P.O. Box 44, Vers chez-les-Blanc, 1000, Lausanne (Switzerland)

    2002-09-01

    Tin is considered to be a priority contaminant by the Codex Alimentarius Commission. Tin can enter foods either from natural sources, environmental pollution, packaging material or pesticides. Higher concentrations are found in processed food and canned foods. Dissolution of the tinplate depends on the of food matrix, acidity, presence of oxidising reagents (anthocyanin, nitrate, iron and copper) presence of air (oxygen) in the headspace, time and storage temperature. To reduce corrosion and dissolution of tin, nowadays cans are usually lacquered, which gives a marked reduction of tin migration into the food product. Due to the lack of modern validated published methods for food products, an ICP-AES (Inductively coupled plasma-atomic emission spectroscopy) method has been developed and evaluated. This technique is available in many laboratories in the food industry and is more sensitive than atomic absorption. Conditions of sample preparation and spectroscopic parameters for tin measurement by axial ICP-AES were investigated for their ruggedness. Two methods of preparation involving high-pressure ashing or microwave digestion in volumetric flasks were evaluated. They gave complete recovery of tin with similar accuracy and precision. Recoveries of tin from spiked products with two levels of tin were in the range 99{+-}5%. Robust relative repeatabilities and intermediate reproducibilities were <5% for different food matrices containing >30 mg/kg of tin. Internal standard correction (indium or strontium) did not improve the method performance. Three emission lines for tin were tested (189.927, 283.998 and 235.485 nm) but only 189.927 nm was found to be robust enough with respect to interferences, especially at low tin concentrations. The LOQ (limit of quantification) was around 0.8 mg/kg at 189.927 nm. A survey of tin content in a range of canned foods is given. (orig.)

  7. Homocysteine and Raynaud's phenomenon: a review.

    Science.gov (United States)

    Lazzerini, Pietro Enea; Capecchi, Pier Leopoldo; Bisogno, Stefania; Cozzalupi, Mauro; Rossi, Pier Carlo; Pasini, Franco Laghi

    2010-01-01

    Raynaud's phenomenon, categorized as primary and secondary when occurring isolated or in association with an underlying disease, respectively, is a paroxysmal and recurrent acral ischemia resulting from an abnormal arterial vasospastic response to cold or emotional stress. The key issue in the pathogenesis of Raynaud's phenomenon is presumed to be a dysregulation in the mechanisms of vascular motility resulting in an imbalance between vasodilatation and vasoconstriction. Homocysteine, a non-protein forming sulphured amino acid proposed as an independent risk factor for atherothrombosis in the general population, clearly demonstrated to produce vascular damage through mechanisms also including endothelial injury and modifications in circulating mediators of vasomotion. The rationale for homocysteine involvement in the pathogenesis of Raynaud's phenomenon led some authors to investigate the possible association between mild hyperhomocysteinemia and such a vascular disturbance, particularly in the course of connective tissue disease. Here we review data regarding this putative association and the supposed mechanisms involved, also discussing the emblematic case of a patient with new-onset severe Raynaud's phenomenon and markedly elevated homocysteinemia.

  8. Activation of transsulfuration pathway by salvianolic acid a treatment: a homocysteine-lowering approach with beneficial effects on redox homeostasis in high-fat diet-induced hyperlipidemic rats

    Science.gov (United States)

    2013-01-01

    Background Elevated homocysteine is a cardiovascular risk factor in hyperlipidemia. Transsulfuration pathway provides an endogenous pathway for homocysteine conversion to antioxidant glutathione (GSH). Salvianolic acid A (Sal A) contains two molecules of caffeic acid and one molecule of danshensu that is capable of enhancing homocysteine transsulfuration, which led to the hypothesis that Sal A has activatory effect on transsulfuration pathway and this effect may have beneficial effects on both homocysteine and redox status in hyperlipidemia. Methods and results To test this hypothesis, we developed a rat model of hyperlipidemia induced by high-fat diet for 16 weeks, during which rats were treated with 1 mg/kg salvianolic acid A (Sal A) for the final 4 weeks. Activities of key enzymes and metabolite profiling in the transsulfuration pathway revealed that hyperlipidemia led to elevated plasma homocysteine levels after 16-week dietary treatment, which was associated with reduced activities of homocysteine transsulfuration enzymes, cystathionine β-synthase (CBS) and cystathionine γ-lyase (CSE). The impaired transsulfuration pathway prevented homocysteine transsulfuration to cysteine, resulting in cysteine deficiency and subsequent reduction in GSH pool size. The redox status was altered in the setting of hyperlipidemia as indicated by GSH/GSSG ratio. Sal A treatment increased hepatic CBS and CSE activities, which was associated with reduced accumulation in circulating homocysteine levels and attenuated decline in hepatic cysteine content in hyperlipidemic rats. Sal A also led to an increase in GSH pool size, which subsequently caused a restored GSH/GSSG ratio. The activatory effect of Sal A on CBS was also observed in normal rats and in in vitro experiment. Conclusion Our results suggest that activation of transsulfuration pathway by Sal A is a promising homocysteine-lowering approach that has beneficial effects on redox homeostasis in hyperlipidemic settings

  9. Solid-Sampling Electrothermal Vaporization Inductively Coupled Plasma Optical Emission Spectrometry for Direct Determination of Total Oxygen in Coal.

    Science.gov (United States)

    Vogt, Thomas; Bauer, Daniela; Nennstiel, David; Otto, Matthias

    2015-10-20

    A new analytical method for direct determination of total oxygen contents in eight coal samples of the Argonne Premium Coal (APC) series and in the NIST SRM 1632d is presented. The development of a suitable calibration procedure, optimization of measurement conditions, and the application of a tailored data processing for handling of plasma effects and high blanks enable the quantification of oxygen simultaneously with other trace, minor, or major elements in whole coal samples by means of electrothermal vaporization inductively coupled plasma optical emission spectrometry (ETV-ICP OES). For comparison, the oxygen contents were determined by a direct oxygen analyzer. The obtained oxygen values of the APC and the reference material NIST SRM 1632d were compared to data in the literature. The precision of the ETV-ICP OES was within ±3.5%, and the recovery better than 92%. With this good accuracy, the developed direct solid sampling method ETV-ICP OES is well suited for the fast determination of oxygen in coals, varying in rank from lignite to semianthracite, in a content range of about 100 ppm up to 27% using 1.5 mg sample weight. This direct analysis method represents an accurate, advantageous alternative to currently used methods for estimation of total oxygen contents in coals.

  10. Zinc antagonizes homocysteine-induced fetal heart defects in rats.

    Science.gov (United States)

    He, Xiaoyu; Hong, Xinru; Zeng, Fang; Kang, Fenhong; Li, Li; Sun, Qinghua

    2009-09-01

    It has been suggested that zinc may have a protective role against heart defects during fetal development. We investigated the effects of zinc on the development of fetal cardiac malformations induced by homocysteine. Pregnant Sprague-Dawley rats were randomized into one of five groups: control (C), homocysteine (H), homocysteine + zinc (Z), homocysteine + folic acid (F), or homocysteine + zinc + folic acid (ZF) (each n = 8). Homocysteine (8 nmol/day) was administered intraperitoneally in the H, Z, F, and ZF groups on gestation days (GD) 8, 9, and 10. Zinc (30 mg/kg day), folic acid (30 mg/kg day), or both (30 mg/kg day each) were administered intragastrically daily in the Z, F, and ZF groups, respectively, throughout the pregnancy. In each group, two fetuses were removed on GD 13, 15, 17, and 19 and examined for cardiac malformations; maternal copper/zinc-containing-superoxide dismutase (Cu/Zn-SOD) activity and metallothionein type I (MT-1) mRNA expression were measured simultaneously. The prevalence of cardiac malformations was significantly higher in group H than in group C, and significantly lower in group Z than in group H at the studied time points. Cu/Zn-SOD activity and MT-1 mRNA levels were significantly lower in group H than in group C, and significantly higher in group Z than in group H. Our data suggest that zinc antagonizes homocysteine-induced teratogenic effects on the fetal heart, possibly via the inhibition of excessive peroxidation.

  11. Determination of homocysteine in plasma by precolumn derivatization-high performance liquid chromatography with fluorescence detection%柱前衍生高效液相色谱-荧光检测法测定血浆中同型半胱氨酸

    Institute of Scientific and Technical Information of China (English)

    唐秀芳; 甄乾娜; 樊子勉; 冯成亚; 丁敏

    2012-01-01

    A precolumn derivatization-high performance liquid chromatographic method for the determination of homocysteine (Hey) in plasma was established. Tris (2-carboxyethyl) phos-phine hydrochloride (TCEP) and N-( 1-pyrenyl) maleimide (NPM) were used as the reduced reagent and derivatization reagent, respectively. The separation was carried out on an Agilent Hypersil C-18 column (250 mm x4. 0 mm, 5μm) in gradient elution mode. The mobile phase consisted of A (15 mmoI/L sodium acetate solution), B (acetonitrile) and C (300 mL water containing 1 mL acetic acid and 1 mL phosphoric acid). The eluate was monitored by the fluorescence detector at an excitation wavelength of 330 nm and an emission wavelength of 380 nm. The mean recovery of Hey was (102.08 ±4.94)%. The linear range was from 0.500 μmol/L to 100μmol/L, with a detection limit of 0. 016μmol/L. The intra-day and inter-day relative standard deviations (RSDs) for Hey were less than 5%. Seven plasma samples of patients with hypertension and seven plasma samples of healthy controls were tested, and the results demonstrated that the Hey in the plasma from the hypertension group was significantly different from that of the control group (p < 0. 05). The developed method is simple, fast, accurate, and suitable for clinical measurement.%建立了一种柱前衍生高效液相色谱-荧光检测法用于测定血浆中同型半胱氨酸(Hcy).使用三(2-羧乙基)膦盐酸盐(TCEP)为还原剂,N-(1-芘)马来酰亚胺(NPM)为衍生剂进行样品预处理,Agilent Hypersil C-18柱(250mm ×4.0 mm,5μm)进行分离,流动相为15 mmol/L醋酸钠-乙腈-混合酸(300 mL水中含1mL醋酸和1mL磷酸)混合溶液,采用梯度洗脱,荧光检测激发波长为330nm,发射波长为380 nm.Hcy的回收率为(102.08±4.94)%.线性范围为0.500~100μmol/L,检出限(以信噪比为3计)为0.016μmol/L.日内与日间相对标准偏差均小于5%.利用该方法对7例高血压患者和7例健康志愿者

  12. Total iodine in infant formula and nutritional products by inductively coupled plasma/mass spectrometry: First Action 2012.14.

    Science.gov (United States)

    Pacquette, Lawrence H; Levenson, Alan M; Thompson, Joseph J; Dowell, Dawn

    2013-01-01

    After an assessment of data generated from a single-laboratory validation study published in the Journal of AOAC INTERNATIONAL 95, 169-176 (2012), a method for determining the total level of iodine in infant formula and nutritional products was presented for consideration for adoption by AOAC during the AOAC Annual Meeting held September 30-October 3, 2012 in Las Vegas, NV. An Expert Review Panel on Infant Formula and Adult Nutritionals concluded that the method met the established standard method performance requirements, and approved the method as AOAC Official First Action. The method involves digestion of the sample with nitric acid in a closed vessel microwave oven, followed by determination by inductively coupled plasma/MS using tellurium as the internal standard. The method LOQ for total iodine was 1.5 microg/100 g, but a practical LOQ was used at 5 microg/100 g total iodine. The analytical range of the method was 5-100 microg/100 g total iodine. The recoveries from 15 spiked nutritional products ranged from 90 to 105%.

  13. Glutamine-supplemented total parenteral nutrition attenuates plasma interleukin-6 in surgical patients with lower disease severity

    Institute of Scientific and Technical Information of China (English)

    Ming-Tsan Lin; Sung-Pao Kung; Sung-Ling Yeh; Koung-Yi Liaw; Ming-Yang Wang; Ming-Liang Kuo; Po-Houng Lee; Wei-Jao Chen

    2005-01-01

    AIM: To evaluate whether the effect of Gln dipeptideenriched total parenteral nutrition (TPN) on postoperative cytokine alteration depended on the disease severity of surgical patients.METHODS: Forty-eight patients with major abdominal surgery were allocated to two groups to receive isonitrogenous (0.228 g nitrogen/kg per d) and isocaloric(30 kcal/kg per d) TPN for 6 d. Control group (Conv)using conventional TPN solution received 1.5 g amino adds/kg per day, whereas the test group received 0.972 g amino acids/kg per day and 0.417 g L-alanyl-L-glutamine(Ala-Gln)/kg per day. Blood samples were collected on d 1 and d 6 postoperatively for plasma interleukin (IL)-2,IL-6, IL-8, and interferon (IFN)-γ analysis.RESULTS: Plasma IL-2 and IFN-γ were not detectable.IL-6 concentrations were significantly lower on the 6th postoperative day in the Ala-Gln group than those in the Conv group in patients with APACHE Ⅱ≤6, whereas no difference was noted in patients with APACHE Ⅱ>6. There was no difference in IL-8 levels between the two groups.No difference in cumulative nitrogen balance was observed on d 2-5 after the operation between the two groups(Ala-Gln -3.2±1.6 g vs Conv -6.5±2.7 g). A significant inverse correlation was noted between plasma IL-6 levels and cumulative nitrogen balance postoperatively in the Ala-Gln group, whereas no such correlation was observed in the Conv group.CONCLUSION: TPN supplemented with Gln dipeptide had no effect on plasma IL-8 levels after surgery. However,Gln supplementation had a beneficial effect on decreasing systemic IL-6 production after surgery in patients with low admission illness severity, and lower plasma IL-6 may improve nitrogen balance in patients with abdominal surgery when Gln was administered.

  14. Determination of cysteine, homocysteine, cystine, and homocystine in biological fluids by HPLC using fluorosurfactant-capped gold nanoparticles as postcolumn colorimetric reagents.

    Science.gov (United States)

    Zhang, Lijuan; Lu, Biqi; Lu, Chao; Lin, Jin-Ming

    2014-01-01

    We have demonstrated for the first time the suitability of fluorosurfactant-capped spherical gold nanoparticles as HPLC postcolumn colorimetric reagents for the direct assay of cysteine, homocysteine, cystine, and homocystine. The success of this work was based on the use of an on-line tris(2-carboxyethyl)phosphine reduction column for cystine and homocystine. Several parameters affecting the separation efficiency and the postcolumn colorimetric detection were thoroughly investigated. Under the optimized conditions, cysteine, homocysteine, cystine, and homocystine in human urine and plasma samples were determined. Detection limits for cysteine, homocysteine, cystine, and homocystine ranged from 0.16-0.49 μM. The accuracy in terms of recoveries ranged between 94.0-102.1%. This proposed method was rapid, inexpensive, and simple.

  15. Homocysteine and coronary heart disease: meta-analysis of MTHFR case-control studies, avoiding publication bias.

    Directory of Open Access Journals (Sweden)

    Robert Clarke

    2012-02-01

    Full Text Available BACKGROUND: Moderately elevated blood levels of homocysteine are weakly correlated with coronary heart disease (CHD risk, but causality remains uncertain. When folate levels are low, the TT genotype of the common C677T polymorphism (rs1801133 of the methylene tetrahydrofolate reductase gene (MTHFR appreciably increases homocysteine levels, so "Mendelian randomization" studies using this variant as an instrumental variable could help test causality. METHODS AND FINDINGS: Nineteen unpublished datasets were obtained (total 48,175 CHD cases and 67,961 controls in which multiple genetic variants had been measured, including MTHFR C677T. These datasets did not include measurements of blood homocysteine, but homocysteine levels would be expected to be about 20% higher with TT than with CC genotype in the populations studied. In meta-analyses of these unpublished datasets, the case-control CHD odds ratio (OR and 95% CI comparing TT versus CC homozygotes was 1.02 (0.98-1.07; p = 0.28 overall, and 1.01 (0.95-1.07 in unsupplemented low-folate populations. By contrast, in a slightly updated meta-analysis of the 86 published studies (28,617 CHD cases and 41,857 controls, the OR was 1.15 (1.09-1.21, significantly discrepant (p = 0.001 with the OR in the unpublished datasets. Within the meta-analysis of published studies, the OR was 1.12 (1.04-1.21 in the 14 larger studies (those with variance of log OR<0.05; total 13,119 cases and 1.18 (1.09-1.28 in the 72 smaller ones (total 15,498 cases. CONCLUSIONS: The CI for the overall result from large unpublished datasets shows lifelong moderate homocysteine elevation has little or no effect on CHD. The discrepant overall result from previously published studies reflects publication bias or methodological problems.

  16. 血浆同型半胱氨酸水平与动态血压变化的关系%Relationship between Plasma Homocysteine and Parameters of Ambulatory Blood Pressure

    Institute of Scientific and Technical Information of China (English)

    薛源; 胡荣; 芦燕玲

    2014-01-01

    -hypertension group(P<0. 05). Conclusion Plasma Hcy level is remarkably correlated with ABP indicators.

  17. Effects of Mecobalamin Change Blood Plasma Homocysteine Level and the Prognostic of the Cerebral Infarction Patients%甲钴胺控制血浆同型半胱氨酸水平对脑梗塞预后的影响

    Institute of Scientific and Technical Information of China (English)

    刘群; 孔祥君

    2011-01-01

    Objective: To explore the cerebral infarction patients with hyperhomocytinemia have been therapy of Mecobalamin,to change the level of blood plasme homocysteine and the prognostic of the cerebral infarction patients. Methods: Select 62 example of the cerebral infarction patients with hyperhomocytinemia, devided into interventional therapy group and conventional therapy group. 2 group are therapy for cerebral infarction, Interventional therapy group is injection Mecobalamin 0.5mg one time per day, 6 weeks. At time point of 2 day, 4 week and 6 week after onset, the plasma level of Hcy were measured, and the National Institute Halth Stroke Scale (NIHSS) and Barthel Intex (BI) were evaluated. Results: 6 week treatment, the plasma Hcy level of interventional therapy group was significantly lower than that of the conventional therapy group (P<0.01), the scores of NIHSS were significantly lower and scores of BI were significantly higher in interventional therapy group than those in conventional therapy group (P<0.05). Conclusions: Mecobalamin therapy reduced plasma Hcy level, improve the prognostic of the cerebral infarction patients.%目的:观察伴有高同型半胱氨酸(Hcy)血症的急性脑梗塞患者,在甲钴胺治疗后,血浆Hcy水平和脑梗塞患者预后的变化情况.方法:选取62例高同型半胱氨酸血症的急性脑梗塞患者,随机分为2组,干预治疗组和常规治疗组,2组均给予常规脑梗塞治疗,干预治疗组在常规脑梗塞治疗基础之上予甲钴胺0.5mg肌肉注射,连用6周.分别在住院第二天、治疗4周后、治疗6周后采用荧光偏振免疫检测法,测定2组患者血浆Hcy水平,并进行美国国立卫生院卒中量表(NIHSS)和Barthel指数(BI)评分.结果:治疗6周后,干预治疗组血浆Hcy水平比常规治疗组明显降低(P<0.01).干预治疗组NIHSS评分明显低于常规治疗组(P<0.05).干预治疗组BI评分明显高于常规治疗组(P<0.05).结论:甲钴胺治疗可降低血

  18. Meta-analysis of clinical trials of folic acid, vitamin B12 and B6 supplementation on plasma homocysteine level and risk of cardiovascular disease%联用叶酸、维生素B6和维生素B12降低同型半胱氨酸水平影响心血管疾病风险的荟萃分析

    Institute of Scientific and Technical Information of China (English)

    李俊; 李彬; 齐娟飞; 沈波

    2015-01-01

    Objective To evaluate the effects of folic acid,vitamin B6 and B12 supplementation on plasma homocysteine level and risk of cardiovascular disease.Methods The databases,including Embase,Pubmed,Ovid,Biosis,China National Knowledge Infra-structure(CNKI),Wanfang Data,VIP Database for Chinese Technical Periodical (VIP),Chinese Biomedical Literature Database (CMB),were searched to identify random control trials between February 1994 to February 2014 on the effect of folic acid,vitamin B6 and B12 supplementation on plasma homocysteine level and risk of cardiovascular disease.The screening,data extraction and quality assessment were conducted in accordance with the inclusion and exclusion criteria by two reviewers independently.The software Review Manager 5.2 was used.Funnel plots and Egger's regression test were applied to evaluate the publication bias.Results Data from 12 studies including 34 481 patients were analyzed using a fixed-effects model.Funnel plot and Egger's test(P > 0.10) confirmed the absence of publication bias.No statistically significant heterogeneity was detected on testing after excluding the sources of heterogeneity (chi-square test,I2 < 50%).Baseline homocysteine levels were similar between the placebo and folic acid,vitamin B6 and B12 groups (all P > 0.05).Mean homocysteine levels were significantly lower with folic acid,vitamin B6 and B12 therapy compared with placebo during follow-up (all P < 0.05).The pooled relative risks with 95% confidence intervals of outcomes for patients treated with folic acid,vitamin B6 and B12 supplementation compared with placebo were 0.98 (0.93-1.03) for cardiovascular event,0.97 (0.87-1.07) for coronary artery disease,1.00 (0.92-1.08) for myocardial infarction and 0.92(0.82-1.03) for cardiovascular death.Conclusions Folic aicd combined with vitamin B6 and B12 treatment significantly reduced plasma homocysteine level,but did not affect the risk of cardiovascular disease.Thus,folic acid combined with

  19. Specific postcolumn detection method for HPLC assay of homocysteine based on aggregation of fluorosurfactant-capped gold nanoparticles.

    Science.gov (United States)

    Lu, Chao; Zu, Yanbing; Yam, Vivian Wing-Wah

    2007-01-15

    Gold nanoparticles (GNPs) capped with nonionic fluorosurfactant molecules (Zonyl FSN) were synthesized, and with the colloidal solution as a probe reagent, a new postcolumn colorimetric detection method for HPLC assay of homocysteine (Hcy) has been developed. The FSN-capped GNPs exhibited excellent stability in aqueous solutions, even in the presence of high salt. The aggregation of the GNPs could be induced by either Hcy or cysteine, resulting in an absorption decrease of the colloidal solution at 525 nm and an absorption increase at longer wavelengths (600-700 nm); however, the GNPs did not respond to other amino acids and biomolecules such as glutathione, cysteinylglycine, and glucose. Under optimal conditions (i.e., high salt, neutral pH, and approximately 70 degrees C), the color change of the GNP solution could almost complete ( approximately 90%) within approximately 30 s upon the addition of Hcy. The high selectivity and very fast kinetics of the reaction make it a promising system for HPLC postcolumn detection. The new technique has been employed to determine total Hcy levels in human urine and plasma samples, and the results are satisfactory.

  20. Homocysteine level in urine of autistic and healthy children.

    Science.gov (United States)

    Kałużna-Czaplińska, Joanna; Michalska, Monika; Rynkowski, Jacek

    2011-01-01

    Homocysteine is an amino acid which plays several important roles in human physiology and is an important biomarker for possible deficiencies of various vitamins (vitamin B₆ and B₁₂, folic acid). In this work GC-MS method was used to determine the levels of homocysteine in the urine of autistic and healthy children. The levels of homocysteine in urine samples from 34 autistic and 21 healthy children were 2.36 ± 1.24 and 0.76 ± 0.31 (mmol∙mol⁻¹ creatinine), respectively. The higher level of homocysteine in autistic children may indicate deficiencies of folic acid and vitamins B₆ and B₁₂ in nutrition of these children. The results of this work were taken into consideration in the nutrition of autistic children treated in the Navicula Centre of Diagnosis and Therapy of Autism in Łódź (Poland).

  1. Evaluation of Homocysteine, Lipoprotein(a) and Endothelin as ...

    African Journals Online (AJOL)

    Evaluation of Homocysteine, Lipoprotein(a) and Endothelin as diagnostic markers of Coronary Artery Disease in Indian population. ... The objective of this study was to assess the role of endothelin, lipoprotein(a), ... Article Metrics.

  2. Serum homocysteine in pre-eclampsia and eclampsia.

    Science.gov (United States)

    Hoque, Md Mozammel; Bulbul, Tania; Mahal, Monzarin; Islam, Nur-A-Farzana; Ferdausi, Munira

    2008-04-01

    Pre-eclampsia and eclampsia are common obstetrical problem causing adverse effects on pregnancy outcome. Large bodies of evidences suggest that hyperhomocysteinemia is a causal factor of pre-eclampsia/eclampsia. This study designed to explore the association between hyperhomocysteinemia and pre-eclampsia/eclampsia, the knowledge of which expected to be used for prevention of pre-eclampsia and eclampsia. In a case-control study serum homocysteine was measured in 136 controls (healthy pregnant), 84 pre-eclamptic and 120 eclamptic pregnant women. Serum homocysteine in patients with pre-eclampsia (9.54 +/- 3.21 micromol/L) and eclampsia (10.57 +/- 3.39 micromol/L) found to be significantly increased compared to controls (6.86 +/- 2.47 micromol/L) (p homocysteine found to be raised more in eclampsia compared to pre-eclampsia (p homocysteine elevation is more compared to that in pre-eclampsia.

  3. Effect of genetic polymorphisms involved in folate metabolism on the concentration of serum folate and plasma total homocysteine (p-tHcy) in healthy subjects after short-term folic acid supplementation: a randomized, double blind, crossover study.

    Science.gov (United States)

    Cabo, Rona; Hernes, Sigrunn; Slettan, Audun; Haugen, Margaretha; Ye, Shu; Blomhoff, Rune; Mansoor, M Azam

    2015-05-01

    Data on the effect of combined genetic polymorphisms, involved in folate metabolism, on the concentration of serum folate after folic acid supplementation are scarce. Therefore, we investigated the impact of seven gene polymorphisms on the concentration of serum folate and p-tHcy in healthy subjects after short-term folic acid supplementation. In a randomized, double blind, crossover study, apparently healthy subjects were given either 0.8 mg folic acid per day (n = 46) or placebo (n = 45) for 14 days. The washout period was 14 days. Fasting blood samples were collected on day 1, 15, 30 and 45. Data on subjects on folic acid supplementation (n = 91) and on placebo (n = 45) were used for the statistical analysis. The concentration of serum folate increased higher in subjects with higher age (53.5 ± 7.0 years) than in subjects with lower age (24.3 ± 3.2 years) after folic acid supplementation (p = 0.006). The baseline concentration of serum folate in subjects with polymorphism combination, reduced folate carrier protein, RFC1-80 GA and methylenetetrahydrofolate reductase, MTHFR677 CT+TT, was lower than RFC1-80 AA and MTHFR677 CT+TT (p = 0.002). After folic acid supplementation, a higher increase in the concentration of serum folate was detected in subjects with polymorphism combination RFC1-80 GA and MTHFR677 CC than RFC1-80 GG and MTHFR CT+TT combination (p folic acid supplementation, in subjects with combined polymorphisms in methylenetetrahydrofolate dehydrogenase, MTHFD1-1958 and MTHFR-677 genes, the concentration of p-tHcy was changed (p = 0.002). The combination of RFC1-80 and MTHFR-677 polymorphisms had a profound affect on the concentration of serum folate in healthy subjects before and after folic acid supplementation.

  4. 阿尔茨海默病和血管性痴呆患者血浆硫化氢与同型半胱氨酸水平的变化及意义%Plasma levels of endogenous hydrogen sulfide and homocysteine in patients with Alzheimer's disease and vascular dementia and the significance thereof

    Institute of Scientific and Technical Information of China (English)

    刘祥琴; 刘小琦; 蒋萍; 黄华; 晏勇

    2008-01-01

    目的 探讨阿尔茨海默病(AD)、血管性痴呆(VD)患者血浆中硫化氢(H2S)和同型半胱氨酸(Hcy)水平的变化及临床意义.方法 收集AD患者31例、VD患者28例、脑血管疾病(CVD)患者20例、正常对照组23名.全部对象均进行简明精神状态量表(MMSE)、日常生活能力量表(ADL)、Hachinski缺血指数(HIS)和Hamilton抑郁量表(HRSD)等检测,用全面衰退量表(GDS)分级.取空腹静脉血6 ml,迅速分离血浆并置于-70℃冰箱保存.分别测定血浆H2S及Hcy的含量,进行比较和相关性分析.结果 (1)AD组、VD组和CVD组血浆H2S水平均明显低于正常对照组[(34±7)μmol/L、(36±5)μmol/L、(37±7)μmol/L vs(45±7)μmol/L,均P0.05).进一步的相关性分析显示:血浆H2S水平与AD患者的病情严重程度呈负相关.(2)AD组血浆Hcy为(14.0±3.0)μmol/L、VD组为(16.0±6.1)μmol/L、CVD组为(14.4±4.9)μmol/L,均明显高于正常对照组[(9.8±2.5)μmol/L,均P<0.01].进一步的相关性分析显示:血浆Hcy水平与AD及VD患者的病情严重程度均呈正相关(r=0.683、P<0.01,r=0.292、P<0.05).结论 AD和VD患者血浆H2S降低、Hcy升高,并与患者的病情严重程度密切相关.%Objective To investigate the plasma levels of endogenous hydrogen sulfide (H2S), a gasotransmitter, and homocysteine (Hcy) in patients with Alzheimer' s disease ( AD), vascular dementia ( VD), and cerebrovascular disease (CVD) and their role in the pathogenesis of AD and VD. Methods 31 AD patients, 28 VD patients, 20 CVD patients , and 23 normal controls ( NC group) underwent examination of plasma concentrations of H2S and Hcy, mini mental state examination (MMSE), activity of daily living scale (ADL), Hachinski ischemic score (HIS) , and Hamilton's depression scale (HRSD). The severity of AD and VD was evaluated according to the global deterioration scale (GDS). Results (1) The plasma H2S levels of the AD, VD, and CVD patients were (34 ± 7), (36±5), and (37 ± 7) μmol/L respectively

  5. Methionine, homocysteine, one carbon metabolism and fetal growth.

    Science.gov (United States)

    Kalhan, Satish C; Marczewski, Susan E

    2012-06-01

    Methionine and folate are the key components of one carbon metabolism, providing the methyl groups for numerous methyl transferase reactions via the ubiquitous methyl donor, s-adenosyl methionine. Methionine metabolism is responsive to nutrient intake, is regulated by several hormones and requires a number of vitamins (B12, pyridoxine, riboflavin) as co-factors. The critical relationship between perturbations in the mother's methionine metabolism and its impact on fetal growth and development is now becoming evident. The relation of folate intake to fetal teratogenesis has been known for some time. Studies in human pregnancy show a continuous decrease in plasma homocysteine, and an increase in plasma choline concentrations with advancing gestation. A higher rate of transsulfuration of methionine in early gestation and of transmethylation in the 3rd trimester was seen in healthy pregnant women. How these processes are impacted by nutritional, hormonal and other influences in human pregnancy and their effect on fetal growth has not been examined. Isocaloric protein restriction in pregnant rats, resulted in fetal growth restriction and metabolic reprogramming. Isocaloric protein restriction in the non-pregnant rat, resulted in differential expression of a number of genes in the liver, a 50% increase in whole body serine biosynthesis and high rate of transmethylation, suggesting high methylation demands. These responses were associated with a significant decrease in intracellular taurine levels in the liver suggesting a role of cellular osmolarity in the observed metabolic responses. These unique changes in methionine and one carbon metabolism in response to physiological, nutritional and hormonal influences make these processes critical for cellular and organ function and growth.

  6. B vitamins and homocysteine in cardiovascular disease and aging.

    Science.gov (United States)

    Wilcken, D E; Wilcken, B

    1998-11-20

    The sulfur-containing amino acid, homocysteine, is formed from the essential amino acid methionine, and a number of B vitamins are involved in methionine metabolism. Pyridoxine, vitamin B6, is a cofactor for cystathionine beta synthase, which mediates the transformation of homocysteine to cystathionine, the initial step in the transsulfuration pathway and the urinary excretion of sulfur. In a normal diet there is conservation of the carbon skeleton, and about 50% of the homocysteine formed is remethylated to methionine via steps that require folic acid and vitamin B12. A deficiency of any of these three vitamins leads to modest homocyst(e)ine elevation, as does diminished renal function, both of which are common in the elderly. It is also established that homocyst(e)ine elevation of this order is associated with increased cardiovascular risk but is also associated with most established risk factors, although it is thought to be an independent contributor. In the inborn error of metabolism homocystinuria due to cystathionine beta synthase deficiency there is greatly increased circulating homocyst(e)ine and a clear association with precocious vascular disease. In about 50% of these patients there is a vascular event before the age of 30 years. The homocysteine-induced adverse vascular changes appear to result from endothelial and smooth muscle cell effects and increased thrombogenesis. We have documented a highly significant reduction in the occurrence of vascular events during 539 patient years of treatment in 32 patients with cystathionine beta synthase deficiency (mean age 30 years, range 9-66 years) by aggressive homocyst(e)ine lowering with pyridoxine, folic acid, and B12 (p = 0.0001). The 15 pyridoxine nonresponsive patients also received oral betaine. Although a cause and effect relationship is postulated for the increased cardiovascular risk associated with mild homocysteine elevation, a common cause of this elevation is the methylenetetrahydrofolate

  7. Exploratory Study of Total and Free Prednisolone Plasma Exposure and Cushingoid Appearance, Quality of Life and Biochemical Toxicity in Adult Male Kidney Transplant Recipients

    DEFF Research Database (Denmark)

    Bergmann, Troels K; Isbel, Nicole M; Ostini, Remo

    2015-01-01

    associated with free prednisolone plasma exposure with a Spearman correlation coefficient of 0.30 (p value 0.02). The correlation coefficient was 0.24 (p value 0.08) for neck to upper arm circumference ratio and free prednisolone plasma exposure. The clinical Cushingoid phenotype as determined by the Visual...... of 54 years and median time post-transplantation of 75 months. Median prednisolone dose was 5 mg. Mean area under the plasma concentration-time curve was 2390 nmol h/L (±580) (SD) and 175 nmol h/L (±78) for total and free prednisolone, respectively. Waist to upper arm circumference ratio was positively...... with total or free prednisolone exposure. CONCLUSIONS: There is a positive correlation between free prednisolone plasma exposure and waist to upper arm circumference ratio in adult male kidney transplant recipients on low maintenance prednisolone doses. There is no significant association between total...

  8. Chemical constituents of ambient particulate air pollution and biomarkers of inflammation, coagulation and homocysteine in healthy adults: A prospective panel study

    Directory of Open Access Journals (Sweden)

    Wu Shaowei

    2012-12-01

    Full Text Available Abstract Background Ambient air pollution has been associated with activation of systemic inflammation and hypercoagulability and increased plasma homocysteine, but the chemical constituents behind the association are not well understood. We examined the relations of various chemical constituents of fine particles (PM2.5 and biomarkers of inflammation, coagulation and homocysteine in the context of traffic-related air pollution. Methods A panel of 40 healthy college students underwent biweekly blood collection for 12 times before and after their relocation from a suburban campus to an urban campus with changing air pollution contents in Beijing. Blood samples were measured for circulatory biomarkers of high-sensitivity C reactive protein (hs-CRP, tumor necrosis factor alpha (TNF-α, fibrinogen, plasminogen activator inhibitor type 1 (PAI-1, tissue-type plasminogen activator (t-PA, von Willebrand factor (vWF, soluble platelet selectin (sP-selectin, and total homocysteine (tHcy. Various air pollutants were measured in a central air-monitoring station in each campus and 32 PM2.5 chemical constituents were determined in the laboratory. We used three different mixed-effects models (single-constituent model, constituent-PM2.5 joint model and constituent residual model controlling for potential confounders to estimate the effects of PM2.5 chemical constituents on circulatory biomarkers. Results We found consistent positive associations between the following biomarkers and PM2.5 chemical constituents across different models: TNF-α with secondary organic carbon, chloride, zinc, molybdenum and stannum; fibrinogen with magnesium, iron, titanium, cobalt and cadmium; PAI-1 with titanium, cobalt and manganese; t-PA with cadmium and selenium; vWF with aluminum. We also found consistent inverse associations of vWF with nitrate, chloride and sodium, and sP-selectin with manganese. Two positive associations of zinc with TNF-α and of cobalt with fibrinogen, and

  9. [Homocysteine metabolism disorders as a potential predictor of preeclamsia].

    Science.gov (United States)

    Kajdy, Anna; Niemiec, Tomasz

    2008-11-01

    Preeclampsia is one of the main causes of maternal and fetal mortality. We lack a reliable test that would identify the "at risk" group of pregnant women, thus allowing us to implement a specific prevention, management and treatment program. Recently, a number of theories regarding the pathophysiology of preeclampsia has been published. The role of vascular pathology as a result of an increase in homocysteine level is often mentioned. The aim of this paper is to review the current literature related to the pathology of preeclampsia and to evaluate the usefulness of assessment of homocysteine level and homocysteine metabolism disorders as a potential predictor of preeclamsia. Hiperhomocysteinemia is a known risk factor of cardiovascular diseases and hypertension. Different sources report a similar correlation between an increase in homocysteine level and the incidence of preeclampsia. As far as the topic of homocysteine in pregnancy is concerned, numerous questions and problems remain unanswered and unsolved. Although there exists a relationship between an increased values of homocysteine and the incidence of preeclampsia, there is not enough information about what group of patients should be included in the screening test to increase the rate of diagnosis and prevention of the most dangerous sequele.

  10. Maternal protein restriction and fetal growth: lack of evidence of a role for homocysteine in fetal programming.

    Science.gov (United States)

    Langley-Evans, Simon C; Lilley, Christina; McMullen, Sarah

    2006-09-01

    The disease-programming effects of a maternal low-protein (MLP) diet in rat pregnancy have been suggested to be attributable of hyperhomocysteinaemia. The aim of the present study was to determine whether MLP feeding impacted upon maternal and day 20 fetal homocysteine concentrations, with ensuing effects upon oxidant/antioxidant status. Sixty-four pregnant rats were fed either MLP diet or control diet before termination of pregnancy at days 4, 10, 18 or 20 gestation (full-term gestation 22 d). Maternal plasma homocysteine concentrations were similar in control and MLP-fed dams at all points in gestation. Fetal plasma homocysteine was similarly unaffected by MLP feeding at day 20 gestation. Activities of superoxide dismutase and glutathione peroxidase were similar in livers of mothers and fetuses in the two groups. Whilst catalase activity was not influenced by diet in maternal liver, MLP exposure increased catalase activity in fetal liver at day 20. Oxidative injury (protein carbonyl concentration) was lower in the livers of MLP-fed animals at day 18 gestation (Phomocysteine concentrations prior to day 20 gestation in the rat. There was no evidence of increased oxidative injury in fetal tissue that might explain the long-term programming effects of the diet.

  11. Vitamin B-12 and homocysteine status among vegetarians: a global perspective.

    Science.gov (United States)

    Elmadfa, Ibrahim; Singer, Ingrid

    2009-05-01

    Evidence exists that well-planned vegetarian diets provide numerous health benefits and are appropriate for all stages of the life cycle. It is also known that animal foods provide micronutrients that are nonexistent or available only in limited amounts in plant foods. Restriction or exclusion of all animal foods may therefore result in low intake of certain micronutrients such as vitamin B-12, thereby affecting vitamin B-12 status and elevating plasma homocysteine concentrations. Overall, the studies we reviewed showed reduced mean vitamin B-12 status and elevated mean homocysteine concentrations in vegetarians, particularly among vegans. Low vitamin B-12 intake may lead to decreased bioavailability and functional deficiency of cobalamin. Although early noticeable symptoms of vitamin B-12 deficiency are nonspecific (unusual fatigue, digestion problems, frequent upper respiratory infections), the best-known clinical manifestations of cobalamin malabsorption are hematologic (pernicious anemia) and neurologic symptoms. Hyperhomocysteinemia is associated with an increased risk of atherosclerosis and cardiovascular disease. Given these health concerns, vegetarians, particularly vegans, must be advised to carefully plan their diets, to monitor their plasma vitamin B-12 on a regular basis to facilitate early detection of low cobalamin status, and to use vitamin B-12-fortified foods or take vitamin B-12 supplements if necessary.

  12. [Plasma taurine levels in patients with esophagus cancer].

    Science.gov (United States)

    Lamônica-Garcia, Vânia Cristina; Marin, Flávia Andréa; Lerco, Mauro Masson; Moreto, Fernando; Henry, Maria Aparecida Coelho Arruda; Burini, Roberto Carlos

    2008-01-01

    The esophagus cancer-host has a two way close relationship as seen in its sulphur-amino acid metabolism. Taurine one of these compounds has ubiquous role in host defense and other physiological mechanisms related to survival. To study the plasma levels of taurine and its precursors in patients with esophagus cancer. In a sectional design both groups, patients (n = 16, 43-73 yrs old) and healthy controls (n = 20, 27-65 yrs old) were assessed for anthropometry, body-weight lost, hematology (Hb, Ht, total leukocytes and lymphocyte counts), general biochemistry (albumin, glucose, lipids and aminotransferases) and chromatographic analysis for taurine, cysteine, and homocysteine. The survival time was registered there since from the clinical-histopathological diagnosis. All participants had a written ethical consent for the research. The cancer patients were predominantly, white males of low social economic class, with spinocellular carcinoma stage IV located at upper 3rd half of them presented hypoalbuminemia and 16% referred significant body-weight loss. The patients showed statistically lower values of Hb, Ht, total and HDL cholesterol and cysteine and significantly higher values of taurine, homocysteine and aminotransferases than healthy controls. A positive relationship was found between taurine and either TLC (r = 0.50) and survival (r = 0.81). Lower plasma cysteine along with higher levels of taurine and homocysteine and the positive direct association of taurine with indications of survival suggest an effective role of this compound and therefore a prospective special nutritional care in its precursors (cysteine, methionine and B vitamins) of these patients.

  13. Correlation between plasma homocysteine levels and behavioral and psychological symptoms in patients with mild to moderate vascular dementia%轻中度血管性痴呆患者血浆同型半胱氨酸水平与精神行为症状的关系

    Institute of Scientific and Technical Information of China (English)

    李芳; 李秀英; 王东玉; 赵瑞颜

    2015-01-01

    小脑均差异无统计学意义(x2=0.528,x2=0.043,x2=0.630,x2=0.166,x2=0.657,x2=1.010,x2=0.019,均P>0.05).结论 高Hcy水平与轻中度VaD患者的以下精神行为症状有关,包括睡眠障碍、高涨/欣快、情绪不稳、异常行为、脱抑制、激越症状,并且Hcy水平越高,精神行为症状越重,高Hcy水平与VaD患者的脑梗死病灶部位无关.%Objective To explore the correlation between serum homocysteine(Hcy) levels and behavioral and psychological symptoms dementia (BPSD) in patients with mild to moderate vascular dementia (VaD).Methods Two hundred and ninety-three patients with mild to moderate vascular dementia (aged 40 or over) admitted to the department of neurology of the First Affiliated Hospital of Liaoning Medical College from January 2012 to January 2015.Patients were diagnosed with dementia by NINDS-AIREN criteria,MMSE scores ≤26,Hachinski ischemic scale(≥4) and clinical dementia rating(1≤ C DR ≤ 2).VaD patients were divided into high Hcy(HHcy) group (Hcy≥ 15 μ,mol/L,n=188) and control group(Hcy<15 μmol/L,n=105).The total scores and the scores of 12 functional domains of behavioral and psychological symptoms in NPI were analyzed by using comparative statistical methods.Results Prevalence of high homocysteine was 64.16% (n=188) among mild to moderate VaD (n=293).The incidence of BPSD in HHcy group(80.9%) was significantly higher than that in the control group (57.1%),the difference was statistically significant (x2=18.932,P<0.01).HHcy patients (27.95±5.04) had a significantly higher total score of NPI compared with control patients (16.87± 1.87),the difference was statistically significant (t=3.753,P<0.01).In terms of scores in 12 functional domains in NPI,the scores in sleep disorders (2.99± 1.40),high (2.10±0.53),irritability/mood swings (2.64± 1.43),abnormal behavior (1.74±0.52),disinhibition (1.40±0.43),agitation (2.02±0.74) were higher than those in control groups (1.85±0.37,0.21±0

  14. Correlation of Seminal Plasma Total Antioxidant Capacity and Malondialdehyde Levels With Sperm Parameters in Men With Idiopathic Infertility

    Directory of Open Access Journals (Sweden)

    Fazeli

    2016-01-01

    Full Text Available Background Oxidative stress is the result of an imbalance between the production and scavenging of reactive oxygen species (ROS. Recently, oxidative stress has been introduced as a major cause of male infertility. Objectives The aim of the present study was to determine the correlation between total antioxidant capacity (TAC and malondialdehyde (MDA as markers of oxidative stress in relation to idiopathic male infertility and sperm parameters. Patients and Methods This case control study was conducted using 35 men with idiopathic infertility and 34 men with proven fertility. Seminal plasma TAC and MDA were measured by ferric reducing ability of plasma (FRAP and thiobarbituric acid (TBA reaction methods, respectively. Results Seminal TAC levels were significantly lower and seminal MDA levels were significantly higher in men with idiopathic infertility than in fertile men (P < 0.0001 and P = 0.004, respectively. A positive correlation was shown between sperm motility, sperm morphology, and TAC levels in men with idiopathic infertility (P = 0.002 and P = 0.002, respectively. In addition, there was a correlation between sperm motility and TAC levels in fertile men (P = 0.005. There was no correlation between sperm count and TAC levels in either men with idiopathic infertility or in fertile men. Negative correlations were observed between MDA levels and sperm motility, morphology, and sperm count only in men with idiopathic infertility (P = 0.003, P = 0.001, and P = 0.006, respectively. Conclusions Our results show that oxidative stress could play an important role in male infertility as well as in sperm motility and sperm morphology.

  15. DNA damage and plasma homocysteine levels are associated with ...

    African Journals Online (AJOL)

    STORAGESEVER

    2010-01-18

    Jan 18, 2010 ... thyroid, approximately 80 - 85% is generated outside the thyroid primarily by conversion of T4 by selenium- dependent 5'deiodinase in the liver and kidney. .... hormone levels and hyponatremia in children with gastroenteritis.

  16. Adherence to Mediterranean diet and close dietetic supervision increase total dietary antioxidant intake and plasma antioxidant capacity in subjects with abdominal obesity.

    Science.gov (United States)

    Kolomvotsou, Anastasia I; Rallidis, Loukianos S; Mountzouris, Konstantinos C; Lekakis, John; Koutelidakis, Antonis; Efstathiou, Stamatis; Nana-Anastasiou, Maria; Zampelas, Antonis

    2013-02-01

    To determine the effect of Mediterranean-type diet and close dietetic supervision on dietary antioxidant intake and plasma total antioxidant capacity (TAC) in patients with abdominal obesity. Ninety subjects with abdominal obesity, 46 in intervention group, 44 in control group, participated in a 2-month, randomized, parallel dietary intervention. All participants were counseled on Greek Mediterranean diet. The intervention group was under close dietetic supervision, followed a specific relevant daily and weekly food plan consuming antioxidant-rich foods and food products. Total dietary antioxidant intake was calculated from the volunteers' food diaries, and plasma TAC using plasma ORAC assay and plasma ferric-reducing antioxidant power (FRAP) assay, both at baseline and at 2 months. Following the 2-month period, total dietary antioxidant intake was increased in the intervention group compared to the control group (P = 0.000). In addition, increased intake of total fat, due to higher consumption of monounsaturated fatty acids, as well as increased intakes of dietary fiber, vitamin C and alcohol was also observed in the intervention group compared to the control group (P dietetic supervision, can increase total dietary antioxidant intake and plasma TAC in patients with abdominal obesity.

  17. Comparison of the effects of surgical and natural menopause on carotid intima media thickness, osteoporosis, and homocysteine levels.

    Science.gov (United States)

    Özkaya, Enis; Cakir, Evrim; Okuyan, Erhan; Cakir, Caner; Ustün, Gülnihal; Küçüközkan, Tuncay

    2011-01-01

    Menopause is associated with increased cardiovascular risk factors. We designed this study to compare common carotid artery intima media thickness (IMT) and homocysteine level between women who had natural menopause and those who had surgical menopause and to correlate IMT, bone mineral density (BMD), and homocysteine level with time since menopause. Ninety healthy postmenopausal women aged 50 to 78 years who were not on hormone therapy (45 women who did not have a prior hysterectomy or oophorectomy and 45 women who had undergone hysterectomy with bilateral oophorectomy) were included in the study. B-mode ultrasonography of the carotid artery, BMD, and serum homocysteine level analysis were completed to evaluate the relationship between type of menopause, time since menopause, and subclinical atherosclerosis. Mean ± SD carotid artery IMT measurements were 0.72 ± 0.002 mm among women experiencing natural menopause and 0.88 ± 0.003 mm among women having bilateral oophorectomy (P = 0.002). After adjusting for time since menopause and age, the mean IMT also differed between the two groups: 0.76 ± 0.003 mm in the natural menopause group and 0.84 ± 0.003 mm in the bilateral oophorectomy group (P = 0.038). The age-adjusted carotid IMT was significantly positively associated with years since menopause (P = 0.001). Mean homocysteine measurements were 10.3 ± 5 μmol/L among women experiencing natural menopause and 9.1 ± 4 μmol/L among women who had bilateral oophorectomy (P = 0.216). Age-adjusted femur total, trochanter, and shaft BMDs were significantly lower in the surgical menopause group (P = 0.041, P = 0.034, and P = 0.046, respectively). Oophorectomy before natural menopause increases IMT but not homocysteine levels independent of age and time since menopause and is associated with lower BMD values after adjustment for age.

  18. Determinants of homocysteine levels in colorectal and breast cancer patients.

    Science.gov (United States)

    Ferroni, P; Palmirotta, R; Martini, F; Riondino, S; Savonarola, A; Spila, A; Ciatti, F; Sini, V; Mariotti, S; Del Monte, G; Roselli, M; Guadagni, F

    2009-10-01

    Homocysteinemia has been associated with oncogenic risk. This study was designed to investigate the homocysteine (Hcy) genotype/phenotype interactions together with the inflammatory and nutritional status of cancer patients. The Hcy levels were analyzed in 47 cancer patients in association with methylenetetrahydrofolate reductase (MTHFR) polymorphisms, folate and inflammatory markers. The MTHFR C677T and A1298C genotype distributions did not differ from those predicted by the Hardy-Weinberg distribution. Conversely, the Hcy levels were higher in the cancer patients (p=0.04), who were also characterized by low-grade inflammation. The Hcy levels correlated with the interleukin-6 (IL-6) (p=0.001), tumor necrosis factor-alpha (TNF-alpha) (p=0.042) and folate (p<0.0001) levels of the patients. Multivariate analysis showed that TNF-alpha (p=0.014) and folate (p=0.019) were independent predictors of elevated Hcy levels in the cancer patients. The MTHFR polymorphisms do not significantly contribute to tHcy (total Hcy) levels in cancer patients, and cancer-related inflammation may be associated with elevated tHcy levels, possibly involving a TNF-alpha mediated pathway.

  19. Association of Seminal Plasma Total Antioxidant Capacity and Malondialdehyde Levels With Sperm Parameters in Infertile Men With Varicocele

    Directory of Open Access Journals (Sweden)

    Salimi

    2016-05-01

    Full Text Available Background Varicocele is one of the most common reasons for male infertility and could impair spermatogenesis through mechanisms that are not well known. Recently, oxidative stress has been introduced as a major reason for male infertility caused by varicocele. Objectives In the current study, we aimed to assess the TAC (total antioxidant capacity and MDA (malondialdehyde as stress oxidative markers in infertile men with varicocele and fertile men, and moreover, their correlation with sperm parameters. Patients and Methods This case control study was performed on 43 infertile men with varicocele and 46 men with proven fertility. The ferric reducing ability of plasma (FRAP and thiobarbituric acid (TBA reaction methods were used for seminal plasma TAC and MDA assay, respectively. Results Lower TAC levels (1.7 ± 0.2 vs. 1.3 ± 0.4 mmol/L, P = 0.0004 and higher MDA levels (2.5 ± 1.1 vs. 5.8 ± 1.9 mmol/L, P < 0.0001 were observed in infertile men with varicocele compared to fertile men. There was no correlation between TAC and MDA in fertile men (r = 0.02, P = 0.9, however, a negative correlation was found between TAC and MDA levels in varicocele infertile men (r = −0.44, P = 0.003. Moreover, a positive correlation was found between sperm count and sperm motility with TAC levels in varicocele infertile men (r = 0.4, P = 0.02 and r = 0.6, P < 0.0001, respectively. There was a correlation between sperm motility and TAC levels in fertile men (r = 0.5, P = 0.001, but other parameters did not correlate with TAC in this group. A negative correlation was shown between semen volume, sperm count, total sperm, sperm motility, and sperm morphology with MDA levels in varicocele infertile men (r = 0.3, P = 0.045; r = −0.4, P = 0.009; r = −0.5, P = 0.002; r = −0.5, P = 0.001 and r = −0.4, P = 0.008, respectively. There was no correlation between these parameters and MDA in fertile men. Conclusions Our findings indicated that oxidative stress could

  20. STATUS HOMOCYSTEINE DAN ASAM FOLAT PADA IBU HAMIL MEREKA

    Directory of Open Access Journals (Sweden)

    Dewi Permaesih

    2012-11-01

    Full Text Available HOMOCYSTEINE AND FOLIC ACID STATUS OF ANEMIC PREGNANT WOMEN.Background: Folic acid deficiency among pregnant women in Indonesia is quite prevalent. It is believed to cause the anemia and the risk of infant neutral tube defect. Folic acid plays a certain role in homocysteine convertion into methionine. Serum homocysteine will increase with the decrease folic acid.Objective: To obtain folic acid consumption, homocysteine and folic acid status in pregnant women suffering from anemia using recent method of determination, and relationship of the three variables.Methodology: Pregnant women in the study area were screened by their Hb values under 11 g/dL. Thirty anemic pregnant women consumption was obtained by used 2x24 hours recall method. Folic acid was analysed by Ion Capture Method and homocysteine was analysed by Fluoresence Polarization Immuno assay.Results: Folic acid consumption was 61 ± 50 µg/mL with a range of 3.5 to 15.1 µg/mL. Normal value of serum folic acid was 3.1 to 12.4 µg/mL. Therefore, the value folic acid of pregnant women in this study was still in the range of normal value. Serum homocysteine value in pregnant women was 7.1 ± 1.95 µg/mL with a range of 3.0 to 10.9 µg/mL, while normal value was 5 to 15 µg/dL.Conclusion: homocysteine, folic acid, pregnant women, anemia. 

  1. Association of plasma levels of homocysteine,endothelin-1 and nitric oxide and hypertension with cerebral hemorrhage%高血压性脑出血与血浆同型半胱氨酸、内皮素1和一氧化氮的关系

    Institute of Scientific and Technical Information of China (English)

    王军; 张均

    2011-01-01

    Objective To investigate the relationship of plasma levels of homocysteine(Hcy), endothelin-1 (ET-1) and nitric oxide (NO) and hypertension with cerebral hemorrhage. Methods Plasma levels of Hcy, ET-1 and NO were examined in 62 patients with hypertension (group A), 45 patients with cerebral hemorrhage without hypertension(group B),60 hypertensive patients with cerebral hemorrhage(group C) and 40 healthy volunteers (group D). Results For groups of A,B,C and D,plasma levels of Hcy were (17. 6±6. 6) μmol/L, (18. 2±7. 2) μmol/L, (21. 9±6. 7) μmol/L and (10. 8±4. 6) μmol/L,those of ET-1 were (100. 7±11. 8) μg/L,(101. 2±12.1) μg/L,(120. 8+ 15. 9) μg/L and (44. 7±10. 6) μg/L,and those of NO were (57. 2±11. 7) mg/L,(58. 6±11. 2) mg/L, (41. 8±13. 2) mg/L and (120. 8±12. 6) mg/L,respectively. Compared with group D, plasma levels of Hcy and ET-1 were higher,but NO was lower in groups of A,B and C(P<0. 05). Plasma levels of Hcy and ET-1 were higher, but NO was lower in group C than those in groups of A and B(P<0. 05). The amount of cerebral hemorrhage was positively correlated to Hcy and ET-1, but negatively correlated with NO(P<0. 05). Conclusion The damage and dysfunction of the endothelial cells exist in the patients with hypertensive cerebral hemorrhage.%目的 探讨血浆同型半胱氨酸(Hcy)、内皮素1(ET-1)和一氧化氮(NO)水平与高血压及其合并脑出血的关系.方法 检测62例单纯高血压患者(A组)、45例单纯脑出血患者(B组)、60例高血压性脑出血患者(C组)和40名健康体检者(D组)血浆Hcy、ET-1和NO的水平.结果 A、B、C和D组的血浆Hcy分别为(17.6±6.6) μmol/L、(18.2±7.2)μmol/L、(21.9±6.7)μmol/L和(10.8±4.6)μmol/L;ET-1分别为(100.7±11.8)μg/L、(101.2±12.1)μg/L、(120.8±15.9)μg/L和(44.7±10.6)μg/L;NO分别为(57.2±11.7) mg/L、(58.6±11.2)m g/L、(41.8±13.2) mg/L和(120.8±12.6)mg/L.与D组比较,A、B和C组Hcy和ET-1水平升高,NO水平降低(P<0.05);C组Hcy和ET-1

  2. 高龄老年原发性高血压患者同型半胱氨酸与心室重构的关系%Correlation between plasma homocysteine level and ventricular remodeling in elderly patients with essential hypertension

    Institute of Scientific and Technical Information of China (English)

    黄姣红; 王林; 刘柏年; 杨丽敏; 郭晓坤; 张红梅; 王超

    2015-01-01

    目的:了解同型半胱氨酸(Hcy)对高龄老年原发性高血压患者左心室肥厚的影响。方法378例高龄老年原发性高血压患者按Hcy水平分为非H型高血压组142例和H型高血压组236例,记录身高、体质量、用药情况及收缩压、舒张压、血浆Hcy、血脂、肾功能等,彩色多普勒超声诊断仪测定左心室形态结构,分析Hcy与左心室重构的关系。结果 H型高血压患者左心室肥厚比例高于非H型高血压患者(45.8%vs 24.6%,χ2=16.81,P<0.001)。H型高血压组收缩压、Hcy水平、左心室后壁厚度(LVPWT)、室间隔厚度(IVST)及左心室质量指数(LVMI)均高于非H型高血压组[分别为(162.20±14.97)mmHg vs(149.70±5.06)mmHg,(19.76±5.83)μmol/L vs(9.53±0.72)μmol/L,(9.77±2.35)mm vs(9.21±2.68)mm,(9.74±3.15)mm vs(8.51±2.42)mm,(118.64±39.38)g/m2 vs(101.85±41.71)g/m2]。单因素分析显示Hcy与LVMI呈正相关(r=0.381,P<0.001),多变量Logistic回归显示高Hcy血症是LVMI增高的独立危险因素。结论高Hcy血症是高血压左心室肥厚的独立危险因素,与高血压协同促进心室重构。%Objective To explore the correlation of serum homocysteine(Hcy)levels and hypertrophy of left ventricle in very elderly hypertensive patients.Methods According to plasma Hcy levels,patients with essential hypertension (n=378) were divided into non H-type hypertension group (n=142) and H-type hypertension group (n=236). Height, weight, reg⁃ular medication, blood pressure, renal function, blood lipid profile and the concentration of plasma Hcy were recorded. Color Doppler ultrasonic equipment was used to determine the morphology and structure of left ventricle. The correlation between plasma Hcy and left ventricle remodeling was analyzed. Results The ratio of left ventricular hypertrophy was higher in H-type hypertension group than that in non H-type hypertension group(45

  3. Betaine-homocysteine methyltransferase (BHMT) : genomic sequencing and relevance to hyperhomocysteinemia and vascular disease in humans

    NARCIS (Netherlands)

    Heil, S.G.; Lievers, K.J.A.; Boers, G.H.; Verhoef, P.; Heijer, den M.; Trijbels, F.J.M.; Blom, H.J.

    2000-01-01

    Elevated homocysteine levels have been associated with arteriosclerosis and thrombosis. Hyperhomocysteinemia is caused by altered functioning of enzymes of its metabolism due to either inherited or acquired factors. Betaine-homocysteine methyltransferase (BHMT) serves, next to methionine synthase, a

  4. Optimization of digestion parameters for analysing the total sulphur of mine tailings by inductively coupled plasma optical emission spectrometry.

    Science.gov (United States)

    Alam, Raquibul; Shang, Julie Q; Cheng, Xiangrong

    2012-05-01

    The oxidation of sulphidic mine tailings and consequent acid generation poses challenges for the environment. Accurate and precise analysis of sulphur content is necessary for impact assessment and management of mine tailings. Here, the authors aim at developing a rapid and easy digestion procedure, which may analyse and measure the total amount of sulphur in mine tailings by using inductively coupled plasma. For evaluating effects of several variables, the researchers used a univariate (analysis of variance (ANOVA)) strategy and considered factors such as composition of the acid mixture, heating time, and refluxing device to optimize the performance. To do the experiment, the researchers have used two certified reference materials (KZK-1 and RTS-2) and samples of tailings from Musselwhite mine. ANOVA result shows that heating time is the most influencing factor on acid digestion of the reference materials whereas in case of a digestion of tailings sample, hydrochloric acid proved to be the most significant parameter. Satisfactory results between the measured and referenced values are found for all experiments. It is found that the aqua regia (1 ml HNO(3) + 3 ml HCl) digestion of 0.1 g of samples after only 40 min of heating at 95°C produced fast, safe, and accurate analytical results with a recovery of 97% for the selected reference materials.

  5. The effect of folate and vitamin B12 supplementation on homocysteine concentrations: a study in hemodialysis patients

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    Azadibakhsh N.

    2007-10-01

    Full Text Available Background: Hyperhomocysteinemia is an independent risk factor for cardiovascular diseases. The frequency of hyperhomocysteinemia is higher in hemodialysis (HD patients than the general population. The objective of this study is to assess the efficacy of high-dose folic acid supplementation with and without vitamin B12 on lowering plasma total homocysteine (tHcy concentrations in HD patients. Methods: Thirty-six HD patients at Imam Hossein Hospital, Tehran, Iran, who had been given folic acid supplements (5 mg/d for at least 3 months before, were enrolled in this clinical trial. Subjects were also checked for other inclusion and exclusion criteria. The subjects were divided randomly into four groups and underwent two months of supplementation as follows: 5 mg/d oral folic acid + placebo in group one, 5 mg/d oral folic acid + vitamin B12 (1 mg/d orally in group two, 15 mg/d oral folic acid + placebo in group three and 15 mg/d oral folic acid + vitamin B12 (1 mg/d orally in group four. Concentrations of plasma tHcy and serum folic acid and vitamin B12 were measured at baseline and after the supplementation period. Dietary intake of patients was also determined during the supplementation period.Results: Of the folic acid supplemented patients, 27.8% had normal levels of tHcy at baseline and 72.2% had hyperhomocysteinemia. After the supplementation period, plasma tHcy increased by 1.35% in group one and decreased by 6.99%, 14.54% and 30.09% in groups two, three and four respectively. Changes in plasma tHcy and serum vitamin B12 were only significant in group four; however, no significant changes were seen for serum folic acid. The percentage of subjects reaching normal levels of plasma tHcy was 5.6 fold higher in group four than in the reference group. Conclusions: Supplementation with 15 mg/d folic acid together with 1 mg/d oral vitamin B12 is more effective in reducing tHcy levels in HD patients.

  6. Folate intake, lifestyle factors, and homocysteine concentrations in younger and older women

    DEFF Research Database (Denmark)

    Rasmussen, Lone Banke; Ovesen, L.; Bulow, I.

    2000-01-01

    Background: An elevated total homocysteine (tHcy) concentration is considered to be an independent risk factor for cardiovascular diseases and has also been associated with an increased risk of neural tube defects. Objective: The objective of this study was to investigate folate intake, folate...... linear regression analyses. Smoking status, coffee consumption, systolic blood pressure, and body mass index were positively associated and estrogen replacement therapy and tea consumption were inversely associated with log tHcy in some of the models. Conclusions: According to the criteria used, between...

  7. Selective homocysteine lowering gene transfer improves infarct healing, attenuates remodelling, and enhances diastolic function after myocardial infarction in mice.

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    Ilayaraja Muthuramu

    Full Text Available BACKGROUND AND AIMS: Homocysteine levels predict heart failure incidence in prospective epidemiological studies and correlate with severity of heart failure in cross-sectional surveys. The objective of this study was to evaluate whether a selective homocysteine lowering intervention beneficially affects cardiac remodelling and cardiac function after myocardial infarction (MI in a murine model of combined hypercholesterolemia and hyperhomocysteinemia. METHODOLOGY AND PRINCIPAL FINDINGS: A selective homocysteine lowering gene transfer strategy was evaluated in female C57BL/6 low density lipoprotein receptor (Ldlr⁻/⁻ cystathionine-ß-synthase (Cbs⁺/⁻ deficient mice fed a hyperhomocysteinemic and high saturated fat/high cholesterol diet using an E1E3E4-deleted hepatocyte-specific adenoviral vector expressing Cbs (AdCBS. MI was induced by permanent ligation of the left anterior descending coronary artery 14 days after saline injection or gene transfer. AdCBS gene transfer resulted in a persistent more than 5-fold (p<0.01 decrease of plasma homocysteine levels and significantly improved endothelial progenitor cell function. Selective homocysteine lowering enhanced infarct healing as indicated by a 21% (p<0.01 reduction of infarct length at day 28 after MI and by an increased number of capillaries and increased collagen content in the infarct zone. Adverse remodelling was attenuated in AdCBS MI mice as evidenced by a 29% (p<0.05 reduction of left ventricular cavity area at day 28, by an increased capillary density in the remote myocardium, and by reduced interstitial collagen. The peak rate of isovolumetric relaxation was increased by 19% (p<0.05 and the time constant of left ventricular relaxation was reduced by 21% (p<0.05 in AdCBS MI mice compared to control MI mice, indicating improved diastolic function. CONCLUSION/SIGNIFICANCE: Selective homocysteine lowering gene transfer improves infarct healing, attenuates remodelling, and

  8. 孕母血浆同型半胱氨酸水平与胎儿出生缺陷的关系及其临床意义%Relationship between Maternal Plasma Homocysteine Level and Fetal Birth Defects and It′s Clinical Significance

    Institute of Scientific and Technical Information of China (English)

    吴瑕; 柳国胜; 万波; 冯强

    2011-01-01

    Objective To determine the relationship between plasma homocysteine (Hcy) level in gestational period and fetal malformation, and the clinical significance in prenatal screening and prenatal diagnosis of birth defects. Methods Fifty - one cases of pregnant women confirmed (gestation) fetal malformation by prenatal diagnosis or after birth were enrolled as the study group,and then they were subdivided into 4 groups according to the different types of birth defects:congenital heart malformation group( group A), neural tube defects group( group B) ,cleft lip and palate group( group C) and other sort of malformations group( group D,except for group A ,B and C). In addition ,another 30 cases of the normal pregnant women and the fetus were selected randomly as healthy control group. Maternal peripheral blood and the specimens of fetal cord blood specimens were collected to detect Hcy by enzymatic cycling assay. Results 1. Umbilical Hcy values in the study group was (13.43 ± 6.57 ) μmol · L-1, which was significantly higher than that in the healthy control group [ (6.30 ± 1.38 ) μmol · L- 1 ]( t=5. 687, P=0. 000). 2. Mean concentrations of plasma Hcy in group A, group B, group C and group D were ( 12.22 ± 4.60 ) μmol · L- 1,(22.78 ± 7.42) μmol · L - 1 , ( 11.24 ± 3.42 ) μmol · L- 1, ( 13.44 ± 6.57 ) μmol · L - 1 , respectively, which were significantly higher than that in the healthy control group [ (6.87 ± 1.43 ) μmol · L-1 ] ( Pa =0. 000). 3. There was a positive correlation of Hcy values between pregnant women and the fetuses in the study group and the healthy control group ( r = 0. 922, P=0. 000 ). Conclusions 1. Maternal hyperhomocysteinemia in the gestational period is one of the risk factors for fetus birth defects,especially in congenital heart malformations, neural tube defects and congenital cleft lip and palate defects. 2. It suggests that the plasma Hcy can be taken as an indicator of prenatal screening for birth defects, and that the

  9. [Serum homocysteine levels in pregnant women with preeclampsia].

    Science.gov (United States)

    Stoĭkova, V; Ivanov, S; Mazneĭkova, V; Tsoncheva, A

    2005-01-01

    Preeclampsia is one of the most common and severe pregnancy complications, which ethiology remains unclear. It is certain that endothelial dysfunction plays a key role in the development of preeclampsia. Homocysteine is an important independent cardiovascular risk factor, which might induce the endothelial dysfunction observed in preeclampsia. 26 pregnant women--14 with preeclampsia (group 1) and 12 healthy term pregnant controls (group 2) were enrolled in the study between December 2003 and August 2004. Six of the women in this group had a superimposed preeclampsia. The mean homocysteine level in the first group was 11,04 mol/l, while in the control group it was 6,24 micromol/l (p homocysteine levels than those with mild form (F = 0.025). Seven of the patients (50%) gave birth before 34th weeks of gestation. The study finds a link between the serum homocysteine as an endothelial dysfunction marker and the development of preeclampsia and a relation between the severity of preeclampsia and the degree of the elevation of the serum homocysteine levels.

  10. Effect of consumption of red wine, spirits and beer on serum homocysteine

    NARCIS (Netherlands)

    Gaag, M.S. van der; Ubbink, J.B.; Sillanaukee, P.; Nikkari, S.; Hendriks, H.F.J.

    2000-01-01

    Serum homocysteine increases after moderate consumption of red wine and spirits, but not after moderate consumption of beer. Vitamin B6 in beer seems to prevent the alcohol-induced rise in serum homocysteine. Chemicals/CAS: Homocysteine, 454-28-4; Pyridoxine, 65-23-6

  11. Imbalance of endogenous homocysteine and hydrogen sulfide metabolic pathway in essential hypertensive children

    Institute of Scientific and Technical Information of China (English)

    CHEN Li; INGRID Sumou; DING Ya-guang; LIU Ying; QI Jian-guang; TANG Chao-shu; DU Jun-bao

    2007-01-01

    Background Hypertension is a common disease of the cardiovascular system. So far, the pathogenesis of primary hypertension remains unclear. The elaboration of its pathogenesis is an important topic in the field which calls for urgent resolution. The aim of this study was to probe into the metabolic imbalance of homocysteine (Hcy) and hydrogen sulfide(H2S) in children with essential hypertension, and its significance in the pathogenesis of essential hypertension.Methods Twenty-five children with essential hypertension and 30 healthy children with normal blood pressure were enrolled in the study. The medical history was investigated and a physical examination was conducted on the subjects.Plasma Hcy content was examined by fluorescence polarization immunoassay (FPIA). The plasma H2S level was detected by a modified method with a sulfide electrode. Data were presented as mean±standard deviation. The t test was applied to the mean values of both groups. Pearson linear correlation analysis was applied to the plasma Hcy and H2S as well as to the systolic pressure against the plasma H2S/Hcy ratio.Results Plasma Hcy, an intermittent metabolite of the endogenous methionine pathway, was markedly increased but plasma H2S, a final product of this pathway was significantly decreased in hypertensive cases when compared with normal subjects ((Hcy: (12.68±9.69) μmol/L vs (6.62±4.79) μmol/L (t=2.996, P<0.01); H2S: (51.93±6.01) μmol/L vs(65.70±5.50) μmol/L) (t=-8.670, P<0.01)). The ratio of plasma H2S/Hcy in children with hypertension was 5.83±2.91,while that of the control group was 11.60±3.30, and the difference is significant with a t=-6.610 and P<0.01. A negative correlation existed between plasma Hcy and H2S concentrations, r=-0.379, P<0.05. And a negative correlation was found between systolic blood pressure and the plasma H2S/Hcy ratio, r=-0.687, P<0.05.Conclusion There was a metabolic imbalance of homocysteine and hydrogen sulfide in essential

  12. Total oxidant-scavenging capacities of plasma from glycogen storage disease type Ia patients as measured by cyclic voltammetry, FRAP and luminescence techniques.

    Science.gov (United States)

    Koren, E; Lipkin, J; Klar, A; Hershkovitz, E; Ginsburg, I; Kohen, R

    2009-10-01

    It has been suggested that the very low incidence of atherosclerosis in glycogen storage disease type Ia (GSD Ia) subjects might be attributed to elevated levels of uric acid, one of the potent low molecular- weight antioxidants found in plasma. The present communication describes a use of two analytical methods-cyclic voltammetry and ferric reducing ability of plasma-and also two chemiluminescence methods to evaluate the total oxidant-scavenging capacities (TOSC) of plasma from GSD Ia patients. Our results verified the elevation of TOSC in GSD Ia patients and we propose the inclusion of luminescence and cyclic voltammetry assays as reliable methods for estimating TOSC in a variety of clinical disorders. Our findings with the cyclic voltammetry method add support to the assumption that the elevated uric acid levels might be the main contributor to plasma antioxidant capacity and possible protection against atherosclerosis.

  13. Plasma antioxidant capacity is reduced in Asperger syndrome.

    Science.gov (United States)

    Parellada, Mara; Moreno, Carmen; Mac-Dowell, Karina; Leza, Juan Carlos; Giraldez, Marisa; Bailón, Concepción; Castro, Carmen; Miranda-Azpiazu, Patricia; Fraguas, David; Arango, Celso

    2012-03-01

    Recent evidence suggests that children with autism have impaired detoxification capacity and may suffer from chronic oxidative stress. To our knowledge, there has been no study focusing on oxidative metabolism specifically in Asperger syndrome (a milder form of autism) or comparing this metabolism with other psychiatric disorders. In this study, total antioxidant status (TAOS), non-enzymatic (glutathione and homocysteine) and enzymatic (catalase, superoxide dismutase, and glutathione peroxidase) antioxidants, and lipid peroxidation were measured in plasma or erythrocyte lysates in a group of adolescent patients with Asperger syndrome, a group of adolescents with a first episode of psychosis, and a group of healthy controls at baseline and at 8-12 weeks. TAOS was also analyzed at 1 year. TAOS was reduced in Asperger individuals compared with healthy controls and psychosis patients, after covarying by age and antipsychotic treatment. This reduced antioxidant capacity did not depend on any of the individual antioxidant variables measured. Psychosis patients had increased homocysteine levels in plasma and decreased copper and ceruloplasmin at baseline. In conclusion, Asperger patients seem to have chronic low detoxifying capacity. No impaired detoxifying capacity was found in the first-episode psychosis group in the first year of illness. Copyright © 2011 Elsevier Ltd. All rights reserved.

  14. Pathomechanism of Insulin Resistance in Men with Central Obesity: Correlation of GGT, GPx, hs-CRP and Plasma Total Cysteine

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    Ritawaty Ritawaty

    2013-08-01

    Full Text Available BACKGROUND: Gamma glutamyltransferase (GGT was reported recently to be associated with inflammation, oxidative stress and increased amino acid. However, role of GGT in insulin resistance pathomechanism is not exactly known. Therefore correlation of GGT with inflammation, oxidative stress and elevated amino acid, in men with central obesity need to be confirmed. METHODS: A cross-sectional study was designed. Men with central obesity were recruited and selected. Anthropometric parameters, creatinine, hs-CRP, fasting glucose, fasting insulin, glutathione peroxidase (GPx activity, GGT, plasma total cysteine (tCys and fatty liver were measured. Subjects were then divided in 4 groups based on waist circumference (WC and fatty liver: Group I: WC ≤100 cm, without fatty liver; Group II: WC ≤100 cm, with fatty liver; Group III: WC >100 cm, without fatty liver; Group IV: WC >100 cm, with fatty liver. All biochemical characteristics in each group were then statistically analyzed. RESULTS: Seventy-two men with central obesity were selected. Numbers of subjects in each group were: Group I: n=33; Group II: n=5; Group III: n=17; Group IV: n=17. We found significant difference of HOMA-IR between Group I and IV, significant correlation between GGT and HOMAIR, and significant negative correlation between tCys with HOMA-IR in Group IV. CONCLUSIONS: GGT was significantly correlated with HOMA-IR in men with WC >100 cm and fatty liver. Further investigation with more subjects is necessary to determine clear GGT cut-off to distinguish subjects with fatty liver and insulin resistance. KEYWORDS: GGT, hs-CRP, GPx, tCys, HOMA-IR, insulin resistance.

  15. EFFECT OF PLASMA ENERGY ON THE ANTIOXIDANT ACTIVITY, TOTAL POLYPHENOLS AND FUNGAL VIABILITY IN CHAMOMILE (MATRICARIA CHAMOMILLA AND CINNAMON (CINNAMOMUM ZEYLANICUM

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    Solís-Pacheco J.R.

    2013-04-01

    Full Text Available The plasma energy is a collection of free particles with positive and negative charges and has demonstrated to be a good prospect for food preservation. The aim of this study was to evaluate the effect of plasma energy on the antioxidant activity, total polyphenol content and yeasts and molds counts in chamomile and cinnamon powder samples treated at 650, 750 and 850 volts for 0, 1, 3 ,5 7 and10 min. Total counts of yeasts and molds in chamomile and cinamon powder samples were determined before and after each treatment with plasma energy. The enumeration was conducted on potatoe dextrose agar suplemented with 0.6% Bengal rose and 2% ampicillin. The antioxidant activity and total polyphenol content were also analyzed. The results showed that plasma exposure on chamomile and cinnamon powder at 850V for 10 minutes significantly reduced (p<0.05 the concentration of yeasts and molds reduced to <1.0 log CFU/g, and only 0.68±0.19 log CFU/g, respectively. Regarding the antioxidant activity and the total polyphenol content, we observed a reduction of 55% in the antioxidant activity in chamomile, while in cinnamon; there was an increase of 21.4% at 750 V. The highest total polyphenol content was observed after 10 min of treatment at 650 V and 750V, with concentrations of 3.3 ± 0.05 mg GAE/g in chamomile and 1.7 ± 0.01 mg GAE/g in cinnamon. We conclude that treatment with plasma at 750 Volts and 10 minutes of exposure was the best treatment to significantly reduce (p<0.05 yeasts and molds counts without affecting the total polyphenol content in chamomile and cinnamon powder.

  16. Comparison of inductively coupled plasma mass spectrometry and colorimetric determination of total and extractable phosphorus in soils

    Energy Technology Data Exchange (ETDEWEB)

    Ivanov, Krasimir, E-mail: kivanov1@abv.bg [Department of Chemistry, University of Agriculture, Plovdiv (Bulgaria); Zaprjanova, Penka [Tobacco and Tobacco Products Institute, Plovdiv (Bulgaria); Petkova, Milena [Department of Chemistry, University of Agriculture, Plovdiv (Bulgaria); Stefanova, Violeta; Kmetov, Veselin; Georgieva, Deyana [Department of Analytical Chemistry, Plovdiv University ' Paisii Hilendarski,' Plovdiv (Bulgaria); Angelova, Violina [Department of Chemistry, University of Agriculture, Plovdiv (Bulgaria)

    2012-05-15

    The most widely used method for determination of total phosphorus in soils is perchloric acid digestion, followed by a colorimetric assay to measure the concentration of P in solution. The first part of this study compares an alternative digestion method, using aqua regia (ISO 11466 and EPA Method 3052), with perchloric acid digestion procedure, and also compares inductively coupled plasma mass spectroscopy (ICP-MS) with colorimetry for the measurement of P on the basis of five internationally certified standard soils and 20 real-life soils with widely different extractability of phosphorus. The phosphorus concentration was determined by means of the reduced phosphomolybdenum blue and ICP-MS. The relationship between methods has been examined statistically. Good agreement of the results from colorimetry and ICP-MS was established for all certified soils. The microwave-assisted digestion with aqua regia was comparable, both in precision and accuracy, with the hot plate aqua regia method. The phosphorus concentration found with the HF + HClO{sub 4} digestion method was in good agreement with the certified mean values, while the superiority in extracting phosphorus, when compared to other methods, was obvious. Soil testing for plant-available phosphorus in Bulgaria and many European countries is most commonly conducted using acid Ca-lactate extraction (Egner-Riehm test) and alkaline sodium bicarbonate extraction (BDS ISO 11263:2002), based on Olsen test, followed by a colorimetric assay to measure the concentration of P in solution. The second part of this study reports the differences between Egner-Riehm test and BDS ISO 11263:2002 measured colorimetrically and by ICP-MS. Fifty soils were selected from South Bulgaria to represent a wide range of soil properties. It was established that ICP-MS consistently yielded significantly higher P concentrations than the colorimetric method in both extraction tests, and the relative differences were greatest in soils with lower

  17. The association of 83 Plasma proteins with CHD mortality, BMI, HDL-, and total cholesterol in men: applying multivariate statistics to identify proteins with prognostic value and biological relevance

    NARCIS (Netherlands)

    Heidema, A.G.; Thissen, U.; Boer, J.M.; Bouwman, F.G.; Feskens, E.J.M.; Mariman, E.C.

    2009-01-01

    In this study, we applied the multivariate statistical tool Partial Least Squares (PLS) to analyze the relative importance of 83 plasma proteins in relation to coronary heart disease (CHD) mortality and the intermediate end points body mass index, HDL-cholesterol and total cholesterol. From a Dutch

  18. Total levels of tissue inhibitor of metalloproteinases 1 in plasma yield high diagnostic sensitivity and specificity in patients with colon cancer

    DEFF Research Database (Denmark)

    Holten-Andersen, Mads N; Christensen, Ib Jarle; Nielsen, Hans Jørgen;

    2002-01-01

    PURPOSE: The purpose of this study was to measure total levels of tissue inhibitor of metalloproteinases (TIMP-1) by ELISA in plasma from blood donors, patients with inflammatory bowel disease (IBD), and patients with cancer and to correlate the results to patient diagnosis. EXPERIMENTAL DESIGN: ...

  19. Total levels of tissue inhibitor of metalloproteinases 1 in plasma yield high diagnostic sensitivity and specificity in patients with colon cancer

    DEFF Research Database (Denmark)

    Holten-Andersen, Mads N; Christensen, Ib Jarle; Nielsen, Hans Jørgen;

    2002-01-01

    PURPOSE: The purpose of this study was to measure total levels of tissue inhibitor of metalloproteinases (TIMP-1) by ELISA in plasma from blood donors, patients with inflammatory bowel disease (IBD), and patients with cancer and to correlate the results to patient diagnosis. EXPERIMENTAL DESIGN...

  20. Determination of Total Arsenic and Speciation in Apple Juice by Liquid Chromatography-Inductively Coupled Plasma Mass Spectrometry: An Experiment for the Analytical Chemistry Laboratory

    Science.gov (United States)

    He, Ping; Colon, Luis A.; Aga, Diana S.

    2016-01-01

    A two-part laboratory experiment was designed for upper-level analytical chemistry students to provide hands-on experience in the use of high performance liquid chromatography (HPLC) for separation and inductively coupled plasma mass spectrometry (ICP-MS) for detection. In the first part of the experiment, the students analyze total arsenic in…