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Sample records for buserelin

  1. The effects of buserelin microparticles on ovarian function in healthy ...

    African Journals Online (AJOL)

    The effects of buserelin microparticles on ovarian function in healthy women. ... A single-blind, randomised, parallel-group design was used to investigate the ... to at least 8 nmoVI (a sign of ovulation) and oestradiol concentrations increased to ...

  2. HALF-DOSE DEPOT TRIPTORELIN COMPARABLE TO REDUCED DAILY BUSERELIN: A RANDOMIZED CLINICAL TRIAL

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    L. Safdarian

    2007-09-01

    Full Text Available Pituitary suppression by depot GnRH agonist may be excessive for ovarian stimulation. This study compares the efficacy of a single half-dose depot triptorelin and reduced-dose daily buserelin in a long protocol ICSI/ET. METHODS: A total of 182 patients were randomized into two groups using sealed envelopes. Pituitary desensitization was obtained in group 1 (91 patients with half-dose (1.87 mg depot triptorelin in the mid-luteal phase of their menstrual cycle, and in group 2 (91 patients with standard daily dose (0.5 mg buserelin, which was then reduced to 0.25 mg at the start of human menopausal gonadotropin (HMG stimulation. RESULTS: No significant differences were found among those who received HCG in terms of clinical pregnancy rate (34.4% in both groups, implantation rate (14.8% in group 1 versus 11.1% in group 2, fertilization rate (93.3 versus 95.6%, poor response rate (11.1 versus 6.7%, and miscarriage rate (11.1 versus 7.8%. No significant differences were seen in number of HMG ampoules used, follicles at HCG administration, and oocytes retrieved. The number of days of stimulation was significantly reduced in group 2 (11.2 +/- 1.8 in group 1 versus 10.6 +/- 1.9, p = 0.030. CONCLUSION: A half-dose of depot triptorelin can be successfully used in ovarian stimulation instead of reduced-dose daily buserelin, with more patient comfort and reduced stress and cost of injections.

  3. Effect of tocotrienol from Bixa orellana (annatto on bone microstructure, calcium content, and biomechanical strength in a model of male osteoporosis induced by buserelin

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    Mohamad NV

    2018-03-01

    Full Text Available Nur-Vaizura Mohamad, Soelaiman Ima-Nirwana, Kok-Yong Chin Department of Pharmacology, Faculty of Medicine, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia Background: Patients receiving androgen deprivation therapy experience secondary hypogonadism, associated bone loss, and increased fracture risk. It has been shown that tocotrienol from Bixa orellana (annatto prevents skeletal microstructural changes in rats experiencing primary hypogonadism. However, its potential in preventing bone loss due to androgen deprivation therapy has not been tested. This study aimed to evaluate the skeletal protective effects of annatto tocotrienol using a buserelin-induced osteoporotic rat model. Methods: Forty-six male Sprague Dawley rats aged 3 months were randomized into six groups. The baseline control (n=6 was sacrificed at the onset of the study. The normal control (n=8 received corn oil (the vehicle of tocotrienol orally daily and normal saline (the vehicle of buserelin subcutaneously daily. The buserelin control (n=8 received corn oil orally daily and subcutaneous buserelin injection (75 µg/kg daily. The calcium control (n=8 was supplemented with 1% calcium in drinking water and daily subcutaneous buserelin injection (75 µg/kg. The remaining rats were given daily oral annatto tocotrienol at 60 mg/kg (n=8 or 100 mg/kg (n=8 plus daily subcutaneous buserelin injection (75 µg/kg (n=8. At the end of the experiment, the rats were euthanized and their blood, tibia, and femur were harvested. Structural changes of the tibial trabecular and cortical bone were examined using X-ray micro-computed tomography. Femoral bone calcium content and biomechanical strength were also evaluated. Results: Annatto tocotrienol at 60 and 100 mg/kg significantly prevented the deterioration of trabecular bone and cortical thickness in buserelin-treated rats (P<0.05. Both doses of annatto tocotrienol also improved femoral biomechanical strength and bone calcium content

  4. Luteinizing hormone-releasing hormone analogue (Buserelin) treatment for central precocious puberty: a multi-centre trial.

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    Werther, G A; Warne, G L; Ennis, G; Gold, H; Silink, M; Cowell, C T; Quigley, C; Howard, N; Antony, G; Byrne, G C

    1990-02-01

    A multi-centre open trial of Buserelin, a luteinizing hormone-releasing hormone (LHRH) analogue, was conducted in 13 children with central precocious puberty. Eleven children (eight girls and three boys), aged 3.4-10.2 years at commencement, completed the required 12 month period of treatment. Initially all patients received the drug by intranasal spray in a dose of 1200 micrograms/day, but by the end of the 12 month period two were having daily subcutaneous injections and three were receiving an increased dose intranasally. The first month of treatment was associated in one boy with increased aggression and masturbation, and in the girls with an increase in the prevalence of vaginal bleeding. Thereafter, however, both behavioural abnormalities and menstruation were suppressed. Median bone age increased significantly during the study, but without any significant change in the ratio of height age to bone age. The median predicted adult height for the group therefore did not alter significantly over the twelve months of the study. Buserelin treatment caused a reduction in the peak luteinizing hormone and follicle-stimulating hormone (FSH) responses to LHRH, mostly to prepubertal levels, and also suppressed basal FSH. In the first weeks of treatment, the girls' serum oestradiol levels rose significantly and then fell to prepubertal or early pubertal levels. A similar pattern was seen for serum testosterone levels. Serum somatomedin-C levels, however, showed little fluctuation over the course of the study. Buserelin treatment was safe and well accepted, and offers the promise of improved linear growth potential in precocious puberty.

  5. Diagnosis of polycystic ovary disease in obese women with a 24-hour hormone profile after buserelin stimulation.

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    Hagag, P; Ben-Shlomo, A; Herzianu, I; Weiss, M

    2000-03-01

    To evaluate the 24-hour hormone response to GnRH agonist stimulation in the diagnosis of polycystic ovary disease (PCOD) in obese women. Forty-three obese PCOD patients and 23 controls were randomized to 1 mg buserelin (BSRL) stimulation (PCOD group P-1, n = 31; control group C-1, n = 12) or 0.1 mg (PCOD group P-0.1, n = 12; control group C-0.1, n = 11). Whereas following 1 mg BSRL administration, serum levels of 17 hydroxyprogesterone (17OHP), delta 4 androstenedione, estradiol (E2) and luteinizing hormone increment (delta LH) as well as the delta LH/delta follicle stimulating hormone ratio were all higher in group P-1 than in group C-1 (P PCOD. The hormone response to BSRL administration is related to obesity, not to insulin resistance.

  6. Relationship between release of LH and incorporation of tritiated thymidine in the anterior pituitary gland of the castrated male rat: effect of LHRH and its highly active analogue buserelin.

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    Romano, M I; Machiavelli, G A; Alonso, G E; Burdman, J A

    1986-01-01

    Castration of the adult male rat significantly (P less than 0.01) increased the concentration of LH in serum and the incorporation of (3H) thymidine into the pituitary DNA. The administration of a single dose of LHRH or its analogue buserelin stimulated the release of LH but it did not modify (3H) thymidine incorporation. When multiple doses of LHRH or buserelin were injected, there was a significant (P less than 0.01) inhibition of LH release and also the incorporation of (3H) thymidine into the DNA of the anterior pituitary gland was significantly (P less than 0.01) diminished. These observations are compatible with the idea of the close relationship between hormonal release and DNA synthesis in the anterior pituitary gland of the rat.

  7. Basal testosterone concentrations after the application of a slow-release GnRH agonist implant are associated with a loss of response to buserelin, a short-term GnRH agonist, in the tom cat.

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    Goericke-Pesch, Sandra; Georgiev, Plamen; Fasulkov, Ivan; Vodenicharov, Angel; Wehrend, Axel

    2013-07-01

    Slow-release GnRH agonist implants are considered an effective, reversible alternative to surgical castration in male tom cats. Individual differences exist regarding the onset of efficacy and might be delayed in some animals. Single measurements of testosterone (T) might result in basal concentrations also in intact male cats. Consequently, GnRH stimulation tests are performed to measure T increase in intact animals and to differentiate castrated from intact male cats. In this study, five tom cats were treated with a 4.7-mg deslorelin implant and GnRH stimulation tests using buserelin were performed before treatment and at 4-week intervals afterward until Week 20. After the last test in Week 20 all animals were castrated. Four of five animals had basal T after 4 weeks and-in contrast to pretreatment-application of buserelin did not result in any further T increase. In one animal, T was low after implant insertion, but not basal; however, a GnRH stimulation test induced a slight increase of T in Week 8 and 16 only and no response in Weeks 4, 12, and 20. Testicular volume was significantly decreased and penile spines disappeared in all cats. Testicular histology showed mixed atrophy, but also fully elongated spermatids in three of five male cats making infertility questionable. Because of the loss of the stimulatory effect of short-term GnRH application (buserelin), it can be assumed that long-term GnRH agonists also act by some mechanisms of downregulation of pituitary GnRH receptors in the tom cat. Copyright © 2013 Elsevier Inc. All rights reserved.

  8. The effects of buserelin microparticles on ovarian function in healthy ...

    African Journals Online (AJOL)

    between 0,03 and 0,05 lJg/ml. The correlation coefficient between dose and duration of anovulation was 0,75; the correlation coefficient between dose and duration of suppression of oestrogen production was 0,76. Conclusion. Apart from minor side-effects such as hot flushes, vaginal spotting and acne, the compound was.

  9. Effect of androgen suppression on hemoglobin in prostate cancer patients undergoing salvage radiotherapy plus 2-year buserelin acetate for rising PSA after surgery

    International Nuclear Information System (INIS)

    Chander, Sarat; Choo, Richard; Danjoux, Cyril; Morton, Gerard; Pearse, Andrew; Deboer, Gerrit; Szumacher, Ewa; Loblaw, Andrew; Cheung, Patrick; Woo, Tony

    2005-01-01

    Purpose: To examine the effect of 2-year androgen suppression (AS) on the pattern and extent of hemoglobin (Hb) change. Methods and Materials: The basis of this report was a Phase II study evaluating a combined treatment of salvage radiotherapy plus 2-year AS for a rising prostate-specific antigen level after surgery. Patients had laboratory tests performed, including Hb and serum testosterone, and answered a quality-of-life questionnaire (European Organization for Research and Treatment of Cancer Quality-of-life Questionnaire 30 item) at regular intervals during the AS and post-AS period. The pattern and extent of the change in Hb was analyzed in relation to the testosterone level. The clinical significance of the Hb change was evaluated with a correlation analysis between Hb and the three specific domains of the questionnaire (Global Health Status, Physical Functioning, and Fatigue). Results: Of a total of 74 accrued patients, 69 were identified as eligible for this report. The median patient age was 70 years. The median follow-up was 38.6 months. The mean Hb was 150.7 g/L at baseline and declined with radiotherapy by 5.9 g/L. The maximal Hb drop during AS was 16.0 g/L (p <0.0001), occurring at 16 months after the initiation of AS. Hb recovery in the post-AS period was slow. The decline and recovery of the mean Hb and hematocrit followed that of testosterone. The three quality-of-life domains did not show any significant correlation with the change in Hb. Conclusion: Two-year AS resulted in a statistically significant drop in the mean Hb, but had no clinically apparent adverse effect. The pattern of Hb change was similar to that of testosterone change

  10. MRI evaluation for conservative treatment in endometriosis and uterine myoma

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    Kasai, Mayumi; Karibe, Akihiko; Sato, Ken; Suzuki, Hirosi; Iida, Hajime [Iwate Prefectural Central Hospital, Morioka (Japan); Yamaya, Rie

    1991-07-01

    Eighteen patients with endometriosis or uterine myoma underwent MRI before and after conservative treatment with Danazol (400 mg/day) or Buserelin (900 {mu}g/day) to examine pathological changes. Of 8 patients with endometrial chocolate cyst, 7 patients were given Dazazol for 3 to 7 months, in whom high signal intensity indicative of mass tended to decrease after chemotherapy especially on T2-weighted images. In addition, the area of cyst was reduced by 31% to 100%. In the remaining one patient receiving Buserelin for 8 months, the reduction rate of cyst was 31%. Ten patients with adenomyosis were classified into the group given Danazol for 5 to 15 months (n=4) and the group given Buserelin for 3 to 8 months (n=6). Low intensity area was decreased by 9% to 25% in the Danazol group and by 20% to 69% in the Buserelin group. Uterine area was reduced by 10% to 32% in the Danazol group and by 4.5% to 51% in the Buserelin group. MRI was helpful in the management of these diseases during conservative treatment. (N.K.).

  11. MRI evaluation for conservative treatment in endometriosis and uterine myoma

    International Nuclear Information System (INIS)

    Kasai, Mayumi; Karibe, Akihiko; Sato, Ken; Suzuki, Hirosi; Iida, Hajime; Yamaya, Rie.

    1991-01-01

    Eighteen patients with endometriosis or uterine myoma underwent MRI before and after conservative treatment with Danazol (400 mg/day) or Buserelin (900 μg/day to examine pathological changes. Of 8 patients with endometrial chocolate cyst, 7 patients were given Dazazol for 3 to 7 months, in whom high signal intensity indicative of mass tended to decrease after chemotherapy especially on T2-weighted images. In addition, the area of cyst was reduced by 31% to 100%. In the remaining one patient receiving Buserelin for 8 months, the reduction rate of cyst was 31%. Ten patients with adenomyosis were classified into the group given Danazol for 5 to 15 months (n=4) and the group given Buserelin for 3 to 8 months (n=6). Low intensity area was decreased by 9% to 25% in the Danazol group and by 20% to 69% in the Buserelin group. Uterine area was reduced by 10% to 32% in the Danazol group and by 4.5% to 51% in the Buserelin group. MRI was helpful in the management of these diseases during conservative treatment. (N.K.)

  12. Chronic suppression of testicular function by constant infusion of gonadotropin-releasing hormone agonist and testosterone supplementation in the bonnet monkey (Macaca radiata).

    Science.gov (United States)

    Ravindranath, N; Ramesh, V; Krishnamurthy, H N; Rao, A J; Moudgal, R N

    1992-03-01

    To study the efficacy of long-term buserelin acetate infusion to desensitize pituitary and block testicular function in adult male monkeys (Macaca radiata). Proven fertile male monkeys exhibiting normal testicular function. Each of the control (n = 5) and experimental monkeys (n = 10) received a fresh miniosmotic pump every 21 days, whereas pumps in controls delivered vehicle of experimentals released 50 micrograms buserelin acetate every 24 hours. On day 170 (renewed every 60 days) a silastic capsule containing crystalline testosterone (T) was implanted in the experimental monkeys. At the end of 3 years, treatment was stopped, and recovery of testicular function and fertility monitored. (1) Treatment resulted in marked reduction of nocturnal but not basal serum T; (2) the pituitary remained desensitized to buserelin acetate throughout the 3-year period; (3) animals were largely azoospermic with occasional oligospermia exhibited by two monkeys; and (4) withdrawal of treatment restored testicular function, with 70% of animals regaining fertility. Long-term infertility (but restorable) can be induced in male monkeys by constant infusion of buserelin acetate and T.

  13. Pharmacokinetics and Bioavailability of the GnRH Analogs in the Form of Solution and Zn2+-Suspension After Single Subcutaneous Injection in Female Rats.

    Science.gov (United States)

    Suszka-Świtek, Aleksandra; Ryszka, Florian; Dolińska, Barbara; Dec, Renata; Danch, Alojzy; Filipczyk, Łukasz; Wiaderkiewicz, Ryszard

    2017-04-01

    Although many synthetic gonadoliberin analogs have been developed, only a few of them, including buserelin, were introduced into clinical practice. Dalarelin, which differs from buserelin by just one aminoacid in the position 6 (D-Ala), is not widely used so far. Gonadotropin-releasing hormone (GnRH) analogs are used to treat many different illnesses and are available in different forms like solution for injection, nasal spray, microspheres, etc. Unfortunately, none of the above drug formulations can release the hormones for 24 h. We assumed that classical suspension could solve this problem. Two sets of experiments were performed. In the first one, buserelin and dalarelin were injected into mature female rats in two forms: suspension, in which the analogs are bounded by Zn 2+ ions and solution. The pharmacokinetic parameters and bioavailability of the analogs were calculated, based on their concentration in the plasma measured by high-performance liquid chromatography method (HPLC). In the second experiment, the hormones in two different forms were injected into superovulated immature female rats and then the concentration of Luteinizing hormone (LH), Follicle-stimulating hormone (FSH) and 17β-estradiol in the serum was measured by radioimmunological method. The Extent of Biological Availability (EBA), calculated on the base of AUC 0-∞ , showed that in the form of solution buserelin and dalarelin display, respectively, only 13 and 8 % of biological availability of their suspension counterparts. Comparing both analogs, the EBA of dalarelin was half (53 %) that of buserelin delivered in the form of solution and 83 % when they were delivered in the form of suspension. The injection of buserelin or dalarelin, in the form of solution or suspension, into superovulated female rats increased LH, FSH and estradiol concentration in the serum. However, after injection of the analogs in the form of suspension, the high concentration of LH and FSH in the serum persisted

  14. Biphasic action of cyclic adenosine 3',5'- monophosphate in gonadotropin-releasing hormone (GnRH) analog-stimulated hormone release from GH3 cells stably transfected with GnRH receptor complementary deoxyribonucleic acid.

    Science.gov (United States)

    Stanislaus, D; Arora, V; Awara, W M; Conn, P M

    1996-03-01

    GH3 cells are a PRL-secreting adenoma cell line derived from pituitary lactotropes. These cells have been stably transfected with rat GnRH receptor complementary DNA to produce four cell lines: GGH(3)1', GGH(3)2', GGH(3)6', and GGH(3)12'. In response to either GnRH or Buserelin (a metabolically stable GnRH agonist), these cell lines synthesize PRL in a cAMP-dependent manner. Only GGH(3)6' cells desensitize in response to persistent treatment with 10(-7) g/ml Buserelin. GGH(3)1', GGH(3)2', and GGH(3)12' cells, however, can be made refractory to Buserelin stimulation by raising cAMP levels either by the addition of (Bu)2cAMP to the medium or by treatment with cholera toxin. In GGH(3) cells, low levels of cAMP fulfill the requirements for a second messenger, whereas higher levels appear to mediate the development of desensitization. The observation that in GGH(3)6' cells, cAMP production persists after the onset of desensitization is consistent with the view that the mechanism responsible for desensitization is distal to the production of cAMP. Moreover, the absence of any significant difference in the amount of cAMP produced per cell in GGH(3)2', GGH(3)6', or GGH(3)12' cells suggests that elevated cAMP production per cell does not explain the development of desensitization in GGH(3)6' cells. We suggest that Buserelin-stimulated PRL synthesis in GGH(3)6' cells is mediated by a different cAMP-dependent protein kinase pool(s) than that in nondesensitizing GGH(3) cells. Such a protein kinase A pool(s) may be more susceptible to degradation via cAMP-mediated mechanisms than the protein kinase pools mediating the Buserelin response in nondesensitizing GGH(3) cells. A similar mechanism has been reported in other systems.

  15. Effects of varying doses of β-nerve growth factor on the timing of ovulation, plasma progesterone concentration and corpus luteum size in female alpacas (Vicugna pacos).

    Science.gov (United States)

    Stuart, C C; Vaughan, J L; Kershaw-Young, C M; Wilkinson, J; Bathgate, R; de Graaf, S P

    2015-11-01

    Ovulation in camelids is induced by the seminal plasma protein ovulation-inducing factor (OIF), recently identified as β-nerve growth factor (β-NGF). The present study measured the total protein concentration in alpaca seminal plasma using a bicinchoninic acid (BCA) protein quantification assay and found it to be 22.2±2.0mgmL(-1). To measure the effects of varying doses of β-NGF on the incidence and timing of ovulation, corpus luteum (CL) size and plasma progesterone concentration, 24 female alpacas were synchronised and treated with either: (1) 1mL 0.9% saline (n=5); (2) 4µg buserelin (n=5); (3) 1mg β-NGF protein (n=5); (4) 0.1mg β-NGF (n=5); or (5) 0.01mg β-NGF (n=4). Females were examined by transrectal ultrasonography at 1-2-h intervals between 20 and 45h after treatment or until ovulation occurred, as well as on Day 8 to observe the size of the CL, at which time blood was collected to measure plasma progesterone concentrations. Ovulation was detected in 0/5, 5/5, 5/5, 3/5 and 0/4 female alpacas treated with saline, buserelin, 1, 0.1 and 0.01mg β-NGF, respectively. Mean ovulation interval (P=0.76), CL diameter (P=0.96) and plasma progesterone concentration (P=0.96) did not differ between treatments. Mean ovulation interval overall was 26.2±1.0h. In conclusion, buserelin and 1mg β-NGF are equally effective at inducing ovulation in female alpacas, but at doses ≤0.1mg, β-NGF is not a reliable method for the induction of ovulation.

  16. A comparative therapeutic management of anoestrus in buffaloes using insulin and GnRH

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    R. D. Purkayastha

    2015-06-01

    Full Text Available Aim: Anoestrus is one of the most common functional disorders of the reproductive cycle in buffaloes. In spite of technical advancement, there is no single cure for the management of anoestrus. Therefore, the aim of this study was to find out the efficacy of gonadotropic releasing hormone (GnRH and metabolic hormone for the management of true anoestrus in buffaloes. Materials and Methods: The experimental animals were selected on the basis of history, gyneco-clinical examinations and progesterone estimation. Deworming was done with Fenbendazole and thereafter mineral mixture was given @ 50 g per animal per day for 10 days in all the selected buffaloes before the start of treatment. The selected buffaloes were randomly divided into four groups (n=25. In Group I, buffaloes were administered 20 μg of buserelin intramuscularly. Buffaloes of Group II were administered long-acting insulin @ 0.25 IU/Kg body weight subcutaneously for 5 consecutive days. In Group III, buffaloes were treated with a combination of insulin and buserelin in the above-mentioned doses whereas buffaloes of Group IV were kept as untreated control. Results: The higher oestrus induction (64% vs. 28% was found in Group III and differed significantly (p<0.05 as compared to control group. The conception rate (69.23% vs. 66.66% was also found higher in Group III but did not differ significantly among the treated groups. The mean time taken for the onset of oestrus was recorded significantly shorter in insulin (8.80±0.69 and GnRH (7.60±0.92 days alone and as compared to other (Group III, 14.43±0.83 and Group IV, 20.57±1.69 days groups. Conclusion: The results of this study indicated better fertility response using Insulin plus Buserelin in true anoestrus buffaloes under field conditions.

  17. Effects of Asn318 and Asp87Asn318 mutations on signal transduction by the gonadotropin-releasing hormone receptor and receptor regulation.

    Science.gov (United States)

    Awara, W M; Guo, C H; Conn, P M

    1996-02-01

    GnRH receptor (GnRH-R) contains Asn87 and Asp318 instead of the more frequently observed Asp87 and Asn318 found in other G protein-coupled receptors. In the present study, site-directed mutagenesis was used to introduce Asn318 and Asp87Asn318 into GnRH-R. The effect on coupling and regulation of GnRH-R was studied by stable expression of wild and mutant mouse GnRH-R in the lactotropic GH3 cells; these normally release PRL in response to TRH stimulation. The responses to Buserelin (a metabolically stable GnRH analog) in three different cell lines, M1, N8, and ND1 (expressing wild-type, Asn318 mutant, and Asp87Asn318 mutant mouse GnRH-R, respectively) were compared with that observed in the previously characterized GGH3-1' cells, which stably express rat GnRH-R. The Asn318 and Asp87Asn318 mutations had no measurable effect on ligand binding, but abolished the initial down-regulation of receptor that was observed in M1 and GGH3-1' cells, suggesting that the normal location of Asn87 and Asp318 in GnRH-R is involved in the regulation of GnRH-R. In N8 and ND1 cells, Buserelin-stimulated inositol phosphate (IP) production was attenuated, but the release of both cAMP and PRL was stimulated in a dose- and time-dependent manner. These mutations apparently impaired the coupling between GnRH-R and G proteins involved in IP production, but not those involved in cAMP release. In M1 cells, Buserelin stimulation produced a significant increase in IP production, but neither cAMP nor PRL release was significantly stimulated. These findings are consistent with the previous suggestion that GnRH-stimulated PRL release is mediated by a cAMP second messenger system in transfected GGH3 cells.

  18. In vivo oestrogenic modulation of Egr1 and Pitx1 gene expression in female rat pituitary gland.

    Science.gov (United States)

    Gajewska, Alina; Herman, Andrzej P; Wolińska-Witort, Ewa; Kochman, Kazimierz; Zwierzchowski, Lech

    2014-12-01

    EGR1 and PITX1 are transcription factors required for gonadotroph cell Lhb promoter activation. To determine changes in Egr1 and Pitx1 mRNA levels in central and peripheral pituitary stimulations, an in vivo model based on i.c.v. pulsatile (1 pulse/0.5 h over 2 h) GnRH agonist (1.5 nM buserelin) or antagonist (2 nM antide) microinjections was used. The microinjections were given to ovariectomised and 17β-oestradiol (E2) (3×20 μg), ERA (ESR1) agonist propyl pyrazole triol (PPT) (3×0.5 mg), ERB (ESR2) agonist diarylpropionitrile (DPN) (3×0.5 mg) s.c. pre-treated rats 30 min after last pulse anterior pituitaries were excised. Relative mRNA expression was determined by quantitative RT-PCR (qRT-PCR). Results revealed a gene-specific response for GnRH and/or oestrogenic stimulations in vivo. Buserelin pulses enhanced Egr1 expression by 66% in ovariectomised rats, whereas the oestradiol-supplemented+i.c.v. NaCl-microinjected group showed a 50% increase in Egr1 mRNA expression. The oestrogenic signal was transmitted via ERA (ESR1) and ERB (ESR2) activation as administration of PPT and DPN resulted in 97 and 62%, respectively, elevation in Egr1 mRNA expression. A synergistic action of GnRH agonist and 17β-oestradiol (E2) stimulation of the Egr1 gene transcription in vivo were found. GnRHR activity did not affect Pitx1 mRNA expression; regardless of NaCl, buserelin or antide i.c.v. pulses, s.c. oestrogenic supplementation (with E2, PPT or DPN) consistently decreased (by -46, -48 and -41% respectively) the Pitx1 mRNA in the anterior pituitary gland. Orchestrated Egr1 and Pitx1 activities depending on specific central and peripheral regulatory inputs could be responsible for physiologically variable Lhb gene promoter activation in vivo. © 2014 Society for Endocrinology.

  19. Erythropoietin may reduce the risk of germ cell loss in boys with cryptorchidism

    DEFF Research Database (Denmark)

    Cortes, D; Visfeldt, J; Thorup, J M

    2001-01-01

    of infertility. In order to increase the number of germ cells, and thereby the fertility potential, additional hormonal therapy has been attempted before surgery. In a study, small doses of the gonadotropin-releasing hormone analogue buserelin before orchiopexy caused higher values. Others have found......: Erythropoietin (Eprex) 100 IU/kg were administered subcutaneously weekly for 3 months prior to surgery in two cryptorchid boys, 6 months old and 1 year 9 months old, respectively, with renal function impairment. RESULTS: The number of spermatogonia per tubular cross-section in testicular biopsies was unusually...... that hormonal treatment with human chorionic gonadotropin or gonadotropin releasing hormone analogue may harm the germ cells in cryptorchidism. The aim of the study is to demonstrate that additional hormonal therapy with erythropoietin has a positive effect on the number of germ cells. MATERIALS AND METHODS...

  20. Intrauterine fertilization capsules--a clinical trial

    DEFF Research Database (Denmark)

    Lenz, S; Lindenberg, S; Sundberg, K

    1991-01-01

    Treatment of 26 women with tubal infertility was attempted using intrauterine capsules loaded with oocytes and spermatozoa. The stimulation protocol was as used for in vitro fertilization and embryo transfer and consisted of short-term use of Buserelin, human menopausal gonadotropin, and human...... and piston from an intrauterine device. Six complete capsules and parts of two other capsules were expelled. None of the women became pregnant, compared with a pregnancy rate of 21% per aspiration following in vitro fertilization and embryo transfer during the same period....... chorionic gonadotropin. Oocytes were collected by ultrasonically guided transvaginal aspiration, and spermatozoa were prepared by swim-up technique. The gametes were placed in agar capsules 4 hr after oocyte collection, and the capsules were introduced to the uterine fundus using an insertion tube...

  1. Premenstrual Exacerbation of Life-Threatening Asthma: Effect of Gonadotrophin Releasing Hormone Analogue Therapy

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    Alun L Edwards

    1996-01-01

    Full Text Available Variability in the severity of asthma during various phases of the menstrual cycle has been frequently suspected. However, the hormonal changes that might affect mediators of bronchospasm have yet to be elucidated. The case of a 41-year-old woman suffering from longstanding asthma with life-threatening exacerbations is reported. The patient was treated with buserelin, a gonadotropin releasing hormone (GnRH analogue, which created a temporary chemical menopause and thus permitted diagnosis of a premenstrual exacerbation of asthma and offered insight into potential therapy. GnRH analogues may therefore be of value in assessing women with severe asthma suspected to vary with the menstrual cycle. The addition of estrogens and progestins at the same time as treatment with GnRH analogue may be of value in determining the role of these hormones in the pathogenesis of menstrually related exacerbations of asthma.

  2. 1,500 IU human chorionic gonadotropin administered at oocyte retrieval rescues the luteal phase when gonadotropin-releasing hormone agonist is used for ovulation induction

    DEFF Research Database (Denmark)

    Humaidan, Peter; Bredkjær, Helle Ejdrup; Westergaard, Lars Grabow

    2009-01-01

    OBJECTIVE: To prospectively assess the reproductive outcome with a small bolus of hCG administered on the day of oocyte retrieval after ovulation induction with a GnRH agonist (GnRHa). DESIGN: Prospective, randomized trial. SETTING: Three hospital-based IVF clinics. PATIENT(S): Three hundred five...... IVF/intracytoplasmic sperm injection patients after a GnRH antagonist protocol. INTERVENTION(S): Ovulation induction was performed with either 10,000 IU hCG or 0.5 mg GnRHa (buserelin) supplemented with 1,500 IU hCG on the day of oocyte retrieval. MAIN OUTCOME MEASURE(S): Reproductive outcome...... bolus of hCG in the GnRHa group secured the luteal phase, resulting in a comparable reproductive outcome in the two groups. However, a nonsignificant difference of 7% in delivery rates justifies further studies to refine the use of GnRHa for ovulation induction....

  3. The development of a testosterone stimulation test in the Virginia opossum (Didelphis virginiana) and its use in evaluating deslorelin contraception.

    Science.gov (United States)

    Johnston, S D; Camacho, F C; Carrillo, L; Guy, N; Govea, J; Martinez, O; Parãs, A; Lisle, A T; D'Occhio, M

    2008-01-01

    The aims of the present study were to examine the variability of testosterone secretion in the Virginia Opossum over a 24 h period and to develop a testosterone stimulation test that would provide an index of the prevailing testosterone biosynthetic capacity of the testes; the latter was used to clinically evaluate the efficacy of a gonadotrophin-releasing hormone agonist contraceptive. Sexually-mature captive opossums (n = 12) located in Africam Safari (Mexico) sampled every 12 h over 24 h consistently showed basal (<0.21 ng mL(-1)) blood testosterone concentrations. Intra-muscular injection of buserelin (2 microg mL(-1)) and human chorionic gonadotrophin (hCG; 1000 IU) resulted in an increase (P < 0.05) of plasma testosterone concentrations with maximal concentrations (3.9 ng mL(-1) and 5.8 ng mL(-1) respectively) occurring 120 min after injection. Plasma testosterone declined relatively rapidly to basal concentrations after 240 min with hCG but remained elevated after the same period of time with buserelin. Male opossums treated with (n = 6) and without (n = 6) a controlled-release deslorelin implant (Suprelorin; 4.7 mg deslorelin) were evaluated over a 10-week period for changes in testosterone secretion (hCG stimulation test) and sperm production (spermatorrhea). At the end of this period, the animals were hemi-castrated and their relative testicular quantitative histology compared. Testosterone concentration decreased over the course of the study in both treated and control animals (P < 0.0001) but there was no apparent effect of deslorelin on testosterone secretion, testicular histology (relative proportions of testicular cell types and seminiferous tubule diameter), or sperm production (presence of sperm in the cauda epididymis or urine).

  4. Participation of the endoplasmic reticulum protein chaperone thio-oxidoreductase in gonadotropin-releasing hormone receptor expression at the plasma membrane

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    W. Lucca-Junior

    2009-02-01

    Full Text Available Chaperone members of the protein disulfide isomerase family can catalyze the thiol-disulfide exchange reaction with pairs of cysteines. There are 14 protein disulfide isomerase family members, but the ability to catalyze a thiol disulfide exchange reaction has not been demonstrated for all of them. Human endoplasmic reticulum protein chaperone thio-oxidoreductase (ERp18 shows partial oxidative activity as a protein disulfide isomerase. The aim of the present study was to evaluate the participation of ERp18 in gonadotropin-releasing hormone receptor (GnRHR expression at the plasma membrane. Cos-7 cells were cultured, plated, and transfected with 25 ng (unless indicated wild-type human GnRHR (hGnRHR or mutant GnRHR (Cys14Ala and Cys200Ala and pcDNA3.1 without insert (empty vector or ERp18 cDNA (75 ng/well, pre-loaded for 18 h with 1 µCi myo-[2-3H(N]-inositol in 0.25 mL DMEM and treated for 2 h with buserelin. We observed a decrease in maximal inositol phosphate (IP production in response to buserelin in the cells co-transfected with hGnRHR, and a decrease from 20 to 75 ng of ERp18 compared with cells co-transfected with hGnRHR and empty vector. The decrease in maximal IP was proportional to the amount of ERp18 DNA over the range examined. Mutants (Cys14Ala and Cys200Ala that could not form the Cys14-Cys200 bridge essential for plasma membrane routing of the hGnRHR did not modify maximal IP production when they were co-transfected with ERp18. These results suggest that ERp18 has a reduction role on disulfide bonds in wild-type hGnRHR folding.

  5. Effects of a single administration of different gonadotropins on day 7 post-insemination on pregnancy outcomes of rabbit does.

    Science.gov (United States)

    Hashem, N M; Aboul-Ezz, Z R

    2018-01-01

    This study aimed to investigate the effects of a single administration of one of three different gonadotropins on Day 7 post-insemination on ovarian activity, progesterone (P 4 ) concentration and pregnancy outcomes of rabbit does. Multiparous, non-lactating, V-line does were artificially inseminated after synchronization and ovulation induction with equine chorionic gonadotropin (eCG; 25 IU im) and gonadotropin releasing hormone (GnRH; 0.8  μg buserelin im) 48 h later. On Day 7 post-inseminarion, does were randomly allocated into four groups (n = 40/group). Does of each group were intramuscularly injected with a single dose of one of physiological saline (placebo; control), GnRH (0.8  μg buserelin), human chorionic gonadotropin (hCG; 25 IU) or eCG (25 IU). Concentration of serum P 4 was determined on Days 6, 9, 11 and 18 post-insemination. On Day 14 post-insemination, the ovaries and reproductive tracts of pregnant does were removed and weighed. Also, numbers of visible follicles, hemorrhagic follicles, corpora lutea of pregnancy (pCLs), new CLs (nCLs; formed after Day 7 post-insemination) and implantation sites were recorded. Conception rate, parturition rate, abortion rate, litter size/weight and litter viability were recorded. The highest (P reproductive tract and ovary weights were for eCG. The highest (P rate of fetal loss was in does treated with GnRH. The concentration of serum P 4 decreased (P conception and parturition rates by 24 and 22%; respectively, while GnRH and hCG treatments decreased (P < 0.05) them by 57 and 47.6%; respectively. Litter size and litter weight at birth were improved by eCG, but were adversely affectd by GnRH and hCG. In conclusion, a single administration of eCG 7 Days post-insemination could be recommended for improving pregnancy outcomes in rabbits. Copyright © 2017 Elsevier Inc. All rights reserved.

  6. Clinical Effects of a Microdose GnRH Agonist Flare Regimen Administered to Poor Responders Undergoing ART Cycles

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    Aflatoonian Abbas

    2009-10-01

    Full Text Available The microdose GnRH agonist (GnRH-a flare protocol may have a particular value for previously poor responders in whom it has been observed to stimulate dramatic increases in serum FSH. The Purpose of this study was to determine the effects of microdose GnRH-a in poor responders. This is a clinical trial with before and after design. This study was done in Research and Clinical Center for Infertility (Shahid Sadoughi University, Yazd, Iran and Madar Hospital, Yazd, Iran. In this study, 61 poor responders volunteered for in vitro fertilization (IVF or intracytoplacmic sperm injection (ICSI. The volunteers were divided into two age groups (group A, 20 - 34; group B, 35 - 40 and received low dose oral contraceptive pills for 21 days, then 40µg of subcutaneous buserelin 2 times/day from day 3 of the cycle and human menopausal gonadotropin (hMG 3 ampoules/day from day 5. Main Outcome measures were number of follicles, oocytes and embryos, and pregnancy rate (PR. These measures were then compared with those of the previous cycle. There were significant differences in all parameters (P < 0.05. Pregnancy occurred in 3 women (5%. There was no significant difference in number of follicles, oocytes and embryo between two age groups (P > 0.05. Use of microdose GnRH-a plus HMG for controlled ovarian hyperstimulation in IVF or ICSI cycles can lead to formation of more follicles, oocyte and embryo in poor responders.

  7. Buffer salt effects in off-line coupling of capillary electrophoresis and mass spectrometry.

    Science.gov (United States)

    Marák, Jozef; Stanová, Andrea

    2014-05-01

    In this work, the impact of buffer salts/matrix effects on the signal in direct injection MS with an electrospray interface (DI-ESI-MS) following pITP fractionation of the sample was studied. A range of buffers frequently used in CE analyses (pH 3-10) was prepared containing 10, 50, and 90% v/v of ACN, respectively. The sets of calibration solutions of cetirizine (an antihistaminic drug with an amphiprotic character) within a 0.05-2.0 mg/L concentration range were prepared in different buffers. The greatest enhancements in the MS signal (in terms of change in the slope of the calibration line) were obtained for the beta-alanine buffer (pH 3.5) in positive ionization and for the borate buffer (pH 9.2) in negative ionization, respectively. The procedure was successfully applied to the analysis of buserelin (a peptidic drug). The slope of the calibration line for solutions containing the beta-alanine buffer with 50% of ACN was 4 times higher than for water or urine, respectively. This study clearly demonstrates that the buffer salt/matrix effects in an offline combination of pITP and DI-ESI-MS can also play a positive role, as they can enhance the signal in MS. A similar influence of the above effects can also be presumed in the CE techniques combined on-line with ESI-MS.

  8. The use of recombinant human LH (lutropin alfa) in the late stimulation phase of assisted reproduction cycles: a double-blind, randomized, prospective study.

    Science.gov (United States)

    Tarlatzis, B; Tavmergen, E; Szamatowicz, M; Barash, A; Amit, A; Levitas, E; Shoham, Z

    2006-01-01

    The effect of recombinant human LH (r-hLH; lutropin alfa) in women undergoing controlled ovarian stimulation with recombinant human FSH (r-hFSH) prior to IVF was investigated. After down-regulation with the GnRH agonist, buserelin, 114 normo-ovulatory women (aged 18-37 years) received r-hFSH alone until the lead follicle reached a diameter of 14 mm. Patients were then randomized in a double-blind fashion to receive r-hFSH in addition to r-hLH, 75 IU s.c., or placebo daily for a maximum of 10 days prior to oocyte retrieval and IVF. The primary end-point was the number of metaphase II oocytes. There were no significant differences between treatment groups for the primary end-point. Serum estradiol concentrations on the day of HCG administration were significantly higher in the group receiving r-hLH plus r-hFSH than in the group receiving r-hFSH alone (P = 0.0001), but there were no significant differences between the groups in dose and duration of r-hFSH treatment required, oocyte maturation, fertilization rate, pregnancy rate and live birth rate. In this patient population, the addition of r-hLH during the late follicular phase of a long GnRH agonist and r-hFSH stimulation cycle provides no further benefit in terms of oocyte maturation or other end-points.

  9. Final adult height in long-term growth hormone-treated achondroplasia patients.

    Science.gov (United States)

    Harada, Daisuke; Namba, Noriyuki; Hanioka, Yuki; Ueyama, Kaoru; Sakamoto, Natsuko; Nakano, Yukako; Izui, Masafumi; Nagamatsu, Yuiko; Kashiwagi, Hiroko; Yamamuro, Miho; Ishiura, Yoshihito; Ogitani, Ayako; Seino, Yoshiki

    2017-07-01

    The objective of this study was to evaluate the gain in final height of achondroplasia (ACH) patients with long-term growth hormone (GH) treatment. We analyzed medical data of 22 adult patients (8 males and 14 females) treated with GH at a dose of 0.05 mg/kg/day. Optionally, tibial lengthening (TL) was performed with the Ilizalov method in 15 patients and TL as well as femoral lengthening (FL) in 6 patients. Concomitant gonadal suppression therapy with buserelin acetate was applied in 13 patients. The mean treatment periods with GH were 10.7 ± 4.0 and 9.3 ± 2.5 years for males and females, respectively. GH treatment augmented the final height +0.60 ± 0.52 SD (+3.5 cm) and +0.51 ± 1.29 SD (+2.8 cm) in males and females compared to non-treated ACH patients, respectively. Final height of ACH patients that underwent GH and TL increased +1.72 ± 0.72 SD (+10.0 cm) and +1.95 ± 1.34 SD (+9.8 cm) in males and females, respectively. GH, TL, and FL increased their final height +2.97 SD (+17.2 cm) and +3.41 ± 1.63 SD (+17.3 cm) in males and females, respectively. Gonadal suppression therapy had no impact on final height. Long-term GH treatment contributes to 2.6 and 2.1% of final adult height in male and female ACH patients, respectively.

  10. EFFECT OF GnRH AND PHOSPHORUS IN DELAYED PUBERTAL SURTI BUFFALO HEIFERS

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    H.B. Dhamsaniya

    2016-06-01

    Full Text Available The study was conducted on eighteen delayed pubertal Surti buffalo heifers, divided into three equal groups (6 in each to evaluate the efficacy of GnRH alone and in combination of phosphorus. The buffalo heifers in Group-I and Group-II were treated with Buserelin acetate (5 ml, IM. Buffalo heifers in Group-II also received additional injection of Toldimphos sodium (10 ml, IM at 3 day interval for 4 times, while buffalo heifers in Group-III served as control. The percentage of induced estrus was highest (83.33% in each treated groups as compared to control group (50%. The mean estrus induction intervals were significantly (P<0.05 shorter in Group-I (20.20 ± 2.18 days and Group-II (18.80 ± 2.32 days as compared to control group (30.24 ± 0.81 days. The conception rate at induced estrus was highest in Group-II (50% followed by Group-I (33.33%. The plasma progesterone levels being significantly lowest on the day of estrus (less than 0.5 ng/ml as compared to pre-treatment days in all groups. The mean total protein and triglycerides levels were differed significantly between the groups on the day of estrus and being significantly higher in Group-II as compared to Group-I and III on that day. A significantly higher level of cholesterol in both treatment groups as compared to the control group during different intervals and also being higher on the day of estrus as compared to pre-treatment days. The mean plasma glucose levels were differed nonsignificantly between and within the treatment and control groups. It is concluded that estrus can be successfully induced in delayed pubertal heifers with the use of GnRH alone and in combination with phosphorus.

  11. A mixture of St. John's wort and sea buckthorn oils regresses endometriotic implants and affects the levels of inflammatory mediators in peritoneal fluid of the rat: A surgically induced endometriosis model.

    Science.gov (United States)

    İlhan, Mert; Süntar, İpek; Demirel, Mürşide Ayşe; Yeşilada, Erdem; Keleş, Hikmet; Küpeli Akkol, Esra

    2016-12-01

    Sea buckthorn (Hippophae rhamnoides L.) and St. John's wort (Hypericum perforatum L.) are used as an emmenagog and for the treatment of other gynecological disorders including uterus inflammation and endometriosis. The aim of the present study is to investigate the potential of a mixture of sea buckthorn and St. John's wort oils (HrHp oil) in the treatment of endometriosis. The activity was assessed in surgically induced endometriosis in rats. A 15-mm piece of endometrium was sutured into the abdominal wall. Twenty-eight days later, a second laparotomy was performed to calculate the endometrial foci areas and to score intra-abdominal adhesions. The rats were treated with either vehicle, HrHp oil formulation, or the reference (buserelin acetate). At the end of the experiment all rats were sacrificed and endometriotic foci areas and intra-abdominal adhesions were re-evaluated. The tissue sections were analyzed histopathologically. Peritoneal fluids of the experimental animals were collected in order to detect the levels of tumor necrosis factor-α, vascular endothelial growth factor, and interleukin-6, which might be involved in the etiology of endometriosis. In the HrHp oil-treated group, the volumes of endometriotic implants were found to be significantly decreased (from 50.8 mm 3 to 18.6 mm 3 , pnecrosis factor-α decreased from 7.02±1.33 pg/mL to 4.78±1.02 pg/mL (pvascular endothelial growth factor from 17.39±8.52 pg/mL to 9.67±5.04 pg/mL (ptreatment. HrHp oil may be a promising alternative for the treatment of endometriosis. Copyright © 2016. Published by Elsevier B.V.

  12. Comparison of follicular dynamics, superovulatory response, and embryo recovery between estradiol based and conventional superstimulation protocol in buffaloes (Bubalus bubalis

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    Narinder Singh

    2015-08-01

    Full Text Available Aim: To evaluate the follicular dynamics, superovulatory response, and embryo recovery following superstimulatory treatment initiated at estradiol-17β induced follicular wave emergence and its comparison with conventional superstimulatory protocol in buffaloes. Materials and Methods: Six normal cycling pluriparous buffaloes, lactating, 90-180 days post-partum, and weighing between 500 and 660 kg were superstimulated twice with a withdrawal period of 35 days in between two treatments. In superstimulation protocol-1 (estradiol group buffaloes were administered estradiol-17β (2 mg, i.m. and eazibreed controlled internal drug release (CIDR was inserted intravaginally (day=0 at the random stage of the estrous cycle. On the day 4, buffaloes were superstimulated using follicle stimulating hormone (FSH 400 mg, divided into 10 tapering doses given at 12 hourly intervals. Prostaglandin F2α analogs (PGF2α was administered at day 7.5 and day 8, and CIDR was removed with the second PGF2α injection. In superstimulation protocol - 2 (conventional group buffaloes were superstimulated on the 10th day of the estrous cycle with same FSH dose regimen and similar timings for PGF2α injections. In both groups, half of the buffaloes were treated with luteinizing hormone (LH 25 mg and other half with 100 ug buserelin; gonadotrophin releasing hormone (GnRH analog at 12 h after the end of FSH treatment. All buffaloes in both protocols were inseminated twice at 12 and 24 h of LH/GnRH treatment. Daily ultrasonography was performed to record the size and number of follicles and superovulatory response. Results: Significantly higher number of small follicles (8 mm, corpora lutea, and transferable embryos was higher in buffaloes superstimulated at estradiol-induced follicular wave compared to the conventional protocol: Further the percentage of transferable embryos was significantly higher in buffaloes administered with LH compared to GnRH.

  13. Progesterone concentration and lambing rate of Karakul ewes treated with prostaglandin and GnRH combined with the ram effect during breeding and non-breeding seasons.

    Science.gov (United States)

    Mirzaei, A; Mohebbi-Fani, M; Omidi, A; Boostani, A; Nazifi, S; Mahmoodian-Fard, H R; Chahardahcherik, M

    2017-09-15

    The combination of ram effect with two injections of PGF 2α 10-days apart and the same protocol plus an additional injection of GnRH prior to the first injection of PGF 2α were examined in Karakul ewes during breeding and non-breeding seasons, respectively. Plasma progesterone (P 4 ) concentrations (to detect the presence of active corpus luteum), twin lambing, litter size and synchronization of lambing were evaluated. In each study 70 ewes (2-4 years old) were divided to a treatment (n = 40) and a control (n = 30) group. During the breeding season, on days -10 and 0 before ram release, the treatment group was injected intramuscularly with PGF 2α (D-Cloprostenol; 0.15 mg). During the non-breeding season, on day -15 before ram release the treatment group was injected with GnRH (buserelin; 4.2 μg) intramuscularly followed by two injections of PGF 2α on days -10 and 0. In both studies, the rams were released into the ewe flock after the second prostaglandin injection (day 0). Blood samples of ewes were collected on days -10, 0, 20 and 70 of the study in breeding season and on days -15, -10, 0, 20 and 70 during non-breeding season. The treatment group had higher P 4 concentrations compared to the control ewes on day 0 in the breeding season (5.80 ± 0.61 vs. 5.0 ± 0.93 ng/mL) and day -10 in the non-breeding season (3.50 ± 0.33 vs. 2.70 ± 0.35 ng/mL) though the differences were not significant (P > 0.05). Based on plasma P 4 concentrations (>1 ng/mL) on day 70, in the breeding season all control ewes (100%) and 91.9% of the treatment ewes were detected to have active corpus luteum (P = 0.09). An almost inverse result (90% vs. 97.5%; P = 0.2) was detected in the non-breeding season. The lambing rate was higher (P = 0.03) in the treatment group compared to the control ewes during the non-breeding season (90% vs. 70%), but tended to be lower (P = 0.07) in the breeding season (73% vs. 90%). Twin lambing rate was higher in the

  14. Inducción del desove y espermiación de anchoveta peruana Engraulis ringens (Jennyns, 1842 en cautiverio mediante la inyección de un análogo de GnRH Induction of spawning and spermiation in captive Peruvian anchovy Engraulis ringens (Jennyns using GnRH analogue injection

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    Carlos Espinoza

    2010-01-01

    Full Text Available Con la finalidad de obtener desoves de ejemplares de Engraulis ringens en cautiverio para realizar pruebas experimentales con huevos y larvas; el presente trabajo evaluó el efecto de inyecciones de acetato de buserelina (un análogo de GnRH; GnRHa sobre desove y espermiación. Además, se utilizó domperidona (DOM para eliminar un posible control dopaminérgico en la liberación de gonadotropinas endógenas en esta especie. Se inyectaron intraperitonealmente ejemplares maduros con 0,005 ug GnRHa g-1 pez (GnRHa; 0,005 ug GnRHa g-1 pez + 0,01 mg DOM g-1 pez (GnRHa+DOM o solución salina a 0,9% (SS. Hubo un efecto inductor de los tratamientos con GnRHa y GnRHa+DOM sobre el desove. Los desoves ocurrieron entre 24 y 48 h post-inyección (p.i. y los porcentajes totales fueron 57,3% y 20,9% con GnRHa y GnRHa+DOM respectivamente, los cuales fueron significativamente diferentes (P , siendo el porcentaje de machos expulsantes a 0 horas p.i. significativamente diferente al control (0 %> (P con GnRHa y 75,0%> con GnRHa+DOM, entre los cuales no se encontró diferencias significativas (P > 0,05. De acuerdo a los resultados obtenidos no existiría un control dopaminérgico en esta especie, ya que hubo expulsión de gametos con o sin la aplicación de domperidona. Por el contrario, se observó significativa reducción de los porcentajes de peces expulsantes al inyectar DOM.In order to achieve spawning in captive Engraulis ringens that would result in eggs and larvae for experimental assays, the present work evaluated the effect of buserelin acétate (an analogue of GnRH; GnRHa injections on spawning and spermiation. Domperidone (DOM was also used in order to reject a possible dopaminergic control in the reléase of endogenous gonadotropins for this species. Ripe fish were mjected mtraperitoneally with 0.005 ug GnRHa g-1 fish (H, 0.005 ug GnRHa g-1 fish + 0.01 mg DOM g-1 fish (HD or saline solution at 0.9%> (SS. The GnRHa and GnRHa+DOM treatments showed an