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Sample records for acid antisense oligonucleotide

  1. RNA Interference-Guided Targeting of Hepatitis C Virus Replication with Antisense Locked Nucleic Acid-Based Oligonucleotides Containing 8-oxo-dG Modifications

    Mutso, Margit; Nikonov, Andrei; Pihlak, Arno; Žusinaite, Eva; Viru, Liane; Selyutina, Anastasia; Reintamm, Tõnu; Kelve, Merike; Saarma, Mart; Karelson, Mati; Merits, Andres

    2015-01-01

    The inhibitory potency of an antisense oligonucleotide depends critically on its design and the accessibility of its target site. Here, we used an RNA interference-guided approach to select antisense oligonucleotide target sites in the coding region of the highly structured hepatitis C virus (HCV) RNA genome. We modified the conventional design of an antisense oligonucleotide containing locked nucleic acid (LNA) residues at its termini (LNA/DNA gapmer) by inserting 8-oxo-2’-deoxyguanosine (8-...

  2. Antisense oligonucleotides as therapeutics for malignant diseases.

    Ho, P T; Parkinson, D R

    1997-04-01

    modifications, chimeric oligonucleotides, or peptide nucleic acids. Continued progress in this arena will require that many of the preclinical challenges confronting antisense development are satisfactory resolved. PMID:9129689

  3. Downregulation of p21(WAF1/CIP1) and estrogen receptor alpha in MCF-7 cells by antisense oligonucleotides containing locked nucleic acid (LNA)

    Jepsen, Jan Stenvang; Pfundheller, Henrik M; Lykkesfeldt, Anne E; Stenvang, Jan

    2004-01-01

    Locked nucleic acid (LNA) is a nucleic acid analog with very high affinity to complementary RNA and a promising compound in the field of antisense research. The intracellular localization and quantitative uptake of oligonucleotides containing LNA were found to be equivalent to those of phosphorot......Locked nucleic acid (LNA) is a nucleic acid analog with very high affinity to complementary RNA and a promising compound in the field of antisense research. The intracellular localization and quantitative uptake of oligonucleotides containing LNA were found to be equivalent to those of...

  4. Optimization of Peptide Nucleic Acid Antisense Oligonucleotides for Local and Systemic Dystrophin Splice Correction in the mdx Mouse

    Yin, Haifang; Betts, Corinne; Saleh, Amer F; Ivanova, Gabriela D; Lee, Hyunil; Seow, Yiqi; Kim, Dalsoo; Gait, Michael J.; Wood, Matthew JA

    2010-01-01

    Antisense oligonucleotides (AOs) have the capacity to alter the processing of pre-mRNA transcripts in order to correct the function of aberrant disease-related genes. Duchenne muscular dystrophy (DMD) is a fatal X-linked muscle degenerative disease that arises from mutations in the DMD gene leading to an absence of dystrophin protein. AOs have been shown to restore the expression of functional dystrophin via splice correction by intramuscular and systemic delivery in animal models of DMD and ...

  5. Antisense oligonucleotides and all-trans retinoic acid have a synergistic anti-tumor effect on oral squamous cell carcinoma

    Chen Wantao

    2008-06-01

    Full Text Available Abstract Background Antisense oligonucleotides against hTR (As-ODN-hTR have shown promising results as treatment strategies for various human malignancies. All-trans retinoic acid (ATRA is a signalling molecule with important roles in differentiation and apoptosis. Biological responses to ATRA are currently used therapeutically in various human cancers. The aim of this study was to evaluate the anti-tumor effects of As-ODN-hTR combined with ATRA in vivo. Methods In situ human oral squamous cell carcinoma (OSCC models were established by subcutaneous injection of Tca8113 cells. Mice were treated with sense oligonucleotides against hTR(S-ODN-hTR alone, As-ODN-hTR alone, ATRA alone, As-ODN-hTR plus ATRA, or S-ODN-hTR plus ATRA. Tumor size and weight were assessed in the mice. Telomerase activity was detected by a TRAP assay, apoptotic cells were evaluated with a Tunel assay, the expression of apoptosis-related proteins (Bcl-2 and Bax was evaluated by immunohistochemistry and ultrastructural morphological changes in the tumor specimen were examined. Results Both As-ODN-hTR and ATRA can significantly inhibit tumor growth in this OSCC xenograft solid-tumor model, and the combination of the two agents had a synergistic anti-tumorogenic effect. We also demonstrated that this anti-tumor effect correlated with inhibition of telomerase activity. Furthermore, significant increases in the number of apoptotic cells, typical apoptotic morphology and a downregulation of the anti-apoptotic protein, bcl-2 were observed in the treated tissues. Conclusion The combination of As-ODN-hTR and ATRA has a synergistic anti-tumor effect. This anti-tumor effect can be mainly attributed to apoptosis induced by a decrease in telomerase activity. Bcl-2 plays an important role in this process. Therefore, combining As-ODN-hTR and ATRA may be an approach for the treatment of human oral squamous cell carcinoma.

  6. Antisense oligonucleotides and all-trans retinoic acid have a synergistic anti-tumor effect on oral squamous cell carcinoma

    Antisense oligonucleotides against hTR (As-ODN-hTR) have shown promising results as treatment strategies for various human malignancies. All-trans retinoic acid (ATRA) is a signalling molecule with important roles in differentiation and apoptosis. Biological responses to ATRA are currently used therapeutically in various human cancers. The aim of this study was to evaluate the anti-tumor effects of As-ODN-hTR combined with ATRA in vivo. In situ human oral squamous cell carcinoma (OSCC) models were established by subcutaneous injection of Tca8113 cells. Mice were treated with sense oligonucleotides against hTR(S-ODN-hTR) alone, As-ODN-hTR alone, ATRA alone, As-ODN-hTR plus ATRA, or S-ODN-hTR plus ATRA. Tumor size and weight were assessed in the mice. Telomerase activity was detected by a TRAP assay, apoptotic cells were evaluated with a Tunel assay, the expression of apoptosis-related proteins (Bcl-2 and Bax) was evaluated by immunohistochemistry and ultrastructural morphological changes in the tumor specimen were examined. Both As-ODN-hTR and ATRA can significantly inhibit tumor growth in this OSCC xenograft solid-tumor model, and the combination of the two agents had a synergistic anti-tumorogenic effect. We also demonstrated that this anti-tumor effect correlated with inhibition of telomerase activity. Furthermore, significant increases in the number of apoptotic cells, typical apoptotic morphology and a downregulation of the anti-apoptotic protein, bcl-2 were observed in the treated tissues. The combination of As-ODN-hTR and ATRA has a synergistic anti-tumor effect. This anti-tumor effect can be mainly attributed to apoptosis induced by a decrease in telomerase activity. Bcl-2 plays an important role in this process. Therefore, combining As-ODN-hTR and ATRA may be an approach for the treatment of human oral squamous cell carcinoma

  7. Voltage-gated calcium channel and antisense oligonucleotides thereto

    Hruska, Keith A. (Inventor); Friedman, Peter A. (Inventor); Barry, Elizabeth L. R. (Inventor); Duncan, Randall L. (Inventor)

    1998-01-01

    An antisense oligonucleotide of 10 to 35 nucleotides in length that can hybridize with a region of the .alpha..sub.1 subunit of the SA-Cat channel gene DNA or mRNA is provided, together with pharmaceutical compositions containing and methods utilizing such antisense oligonucleotide.

  8. A locked nucleic acid antisense oligonucleotide (LNA silences PCSK9 and enhances LDLR expression in vitro and in vivo.

    Nidhi Gupta

    Full Text Available BACKGROUND: The proprotein convertase subtilisin/kexin type 9 (PCSK9 is an important factor in the etiology of familial hypercholesterolemia (FH and is also an attractive therapeutic target to reduce low density lipoprotein (LDL cholesterol. PCSK9 accelerates the degradation of hepatic low density lipoprotein receptor (LDLR and low levels of hepatic PCSK9 activity are associated with reduced levels of circulating LDL-cholesterol. METHODOLOGY/PRINCIPAL FINDINGS: The present study presents the first evidence for the efficacy of a locked nucleic acid (LNA antisense oligonucleotide (LNA ASO that targets both human and mouse PCSK9. We employed human hepatocytes derived cell lines HepG2 and HuH7 and a pancreatic mouse beta-TC3 cell line known to express high endogenous levels of PCSK9. LNA ASO efficiently reduced the mRNA and protein levels of PCSK9 with a concomitant increase in LDLR protein levels after transfection in these cells. In vivo efficacy of LNA ASO was further investigated in mice by tail vein intravenous administration of LNA ASO in saline solution. The level of PCSK9 mRNA was reduced by approximately 60%, an effect lasting more than 16 days. Hepatic LDLR protein levels were significantly up-regulated by 2.5-3 folds for at least 8 days and approximately 2 fold for 16 days. Finally, measurement of liver alanine aminotransferase (ALT levels revealed that long term LNA ASO treatment (7 weeks does not cause hepatotoxicity. CONCLUSION/SIGNIFICANCE: LNA-mediated PCSK9 mRNA inhibition displayed potent reduction of PCSK9 in cell lines and mouse liver. Our data clearly revealed the efficacy and safety of LNA ASO in reducing PCSK9 levels, an approach that is now ready for testing in primates. The major significance and take home message of this work is the development of a novel and promising approach for human therapeutic intervention of the PCSK9 pathway and hence for reducing some of the cardiovascular risk factors associated with the metabolic

  9. A Tandem Oligonucleotide Approach for SNP-Selective RNA Degradation Using Modified Antisense Oligonucleotides

    Magner, Dorota; Biala, Ewa; Lisowiec-Wachnicka, Jolanta; Kierzek, Elzbieta; Kierzek, Ryszard

    2015-01-01

    Antisense oligonucleotides have been studied for many years as a tool for gene silencing. One of the most difficult cases of selective RNA silencing involves the alleles of single nucleotide polymorphisms, in which the allele sequence is differentiated by a single nucleotide. A new approach to improve the performance of allele selectivity for antisense oligonucleotides is proposed. It is based on the simultaneous application of two oligonucleotides. One is complementary to the mutated form of...

  10. Antisense Oligonucleotide Therapy for Inherited Retinal Dystrophies.

    Gerard, Xavier; Garanto, Alejandro; Rozet, Jean-Michel; Collin, Rob W J

    2016-01-01

    Inherited retinal dystrophies (IRDs) are an extremely heterogeneous group of genetic diseases for which currently no effective treatment strategies exist. Over the last decade, significant progress has been made utilizing gene augmentation therapy for a few genetic subtypes of IRD, although several technical challenges so far prevent a broad clinical application of this approach for other forms of IRD. Many of the mutations leading to these retinal diseases affect pre-mRNA splicing of the mutated genes . Antisense oligonucleotide (AON)-mediated splice modulation appears to be a powerful approach to correct the consequences of such mutations at the pre-mRNA level , as demonstrated by promising results in clinical trials for several inherited disorders like Duchenne muscular dystrophy, hypercholesterolemia and various types of cancer. In this mini-review, we summarize ongoing pre-clinical research on AON-based therapy for a few genetic subtypes of IRD , speculate on other potential therapeutic targets, and discuss the opportunities and challenges that lie ahead to translate splice modulation therapy for retinal disorders to the clinic. PMID:26427454

  11. Optimizing antisense oligonucleotides using phosphorodiamidate morpholino oligomers.

    Popplewell, Linda J; Malerba, Alberto; Dickson, George

    2012-01-01

    Duchenne muscular dystrophy (DMD) is caused by mutations that disrupt the reading frame of the human DMD gene. Selective removal of exons flanking an out-of-frame DMD mutation can result in an in-frame mRNA transcript that may be translated into an internally deleted Becker muscular dystrophy-like functionally active dystrophin protein with therapeutic activity. Antisense oligonucleotides (AOs) can be designed to bind to complementary sequences in the targeted mRNA and modify pre-mRNA splicing to correct the reading frame of a mutated transcript. AO-induced exon skipping resulting in functional truncated dystrophin has been demonstrated in animal models of DMD both in vitro and in vivo, in DMD patient cells in vitro in culture, and in DMD muscle explants. The recent advances made in this field suggest that it is likely that AO-induced exon skipping will be the first gene therapy for DMD to reach the clinic. However, it should be noted that personalized molecular medicine may be necessary, since the various reading frame-disrupting mutations are spread across the DMD gene. The different deletions that cause DMD would require skipping of different exons, which would require the optimization and clinical trial workup of many specific AOs. This chapter describes the methodologies available for the optimization of AOs, in particular phosphorodiamidate morpholino oligomers, for the targeted skipping of specific exons on the DMD gene. PMID:22454060

  12. Inhibition of hepatitis B virus in vitro by antisense oligonucleotides

    A series of antisense phosphorothioate oligodeoxynucleotides against hepatitis B virus (HBV) were synthesized and evaluated for their antiviral effect in Hep-G2 cells transfected with HBV genome. The inhibitor effect of the tested antisense oligonucleotides was sequence-specific, dose- and time-dependent, and synergistic for certain combinations. In virus-inhibitory concentrations the oligonucleotides were harmless to 2.2.15 cells. The most effective antisense oligonucleotides were found directed against the HBV mRNA transcribed from the cap site of SP II promoter, the portion of polyadenylation signal and the initiation region of gene S, with an inhibition of the HBsAg and HBeAg production by 85 - 95 % and 50 - 60 %, respectively. To our surprise, antisense oligonucleotides directed against three key sites of HBV X gene blocked the expression of HBsAg, HBeAg and HBxAg. This fact might be related to the trans-activation of HBV X protein. Using radioisotope labelling, we demonstrated that Lipofectin promoted the cellular uptake and antiviral effect of antisense oligomers in 2.2.15 cells. These results suggest a therapeutic potential of antisense oligonucleotides in the treatment of patients chronically infected with HBV. (author)

  13. Phosphorothioate Antisense Oligonucleotides Induce the Formation of Nuclear Bodies

    Lorenz, Peter; Baker, Brenda F.; Bennett, C. Frank; Spector, David L.

    1998-01-01

    Antisense oligonucleotides are powerful tools for the in vivo regulation of gene expression. We have characterized the intracellular distribution of fluorescently tagged phosphorothioate oligodeoxynucleotides (PS-ONs) at high resolution under conditions in which PS-ONs have the potential to display antisense activity. Under these conditions PS-ONs predominantly localized to the cell nucleus where they accumulated in 20–30 bright spherical foci designated phosphorothioate bodies (PS bodies), w...

  14. Stability measurements of antisense oligonucleotides by capillary gel electrophoresis.

    Bruin, G J; Börnsen, K O; Hüsken, D; Gassmann, E; Widmer, H M; Paulus, A

    1995-08-11

    The approach of using antisense oligonucleotides as potential drugs is based on hybridization of a short chemically-modified oligonucleotide with complementary cellular DNA or RNA sequences. A critical question is the stability of chemically modified antisense oligonucleotides in cellular environments. In a model system, resistance against various nucleases was evaluated by capillary gel electrophoresis (CGE). For some of the samples, matrix assisted laser desorption and ionization mass spectrometry (MALDI-MS) was used as an additional analytical tool to perform stability measurements. Using CGE, the enzymatic degradation of single nucleotides from the oligomer can be followed after different incubation times. 10% T polyacrylamide gels give baseline resolution for oligonucleotides ranging between 5 and 30 bases in length. The kinetic influence of a specific nuclease concentration and the antisense oligonucleotide structure on the cleavage reaction are discussed. Also, a simple desalting method to improve the injection efficiency and sensitivity of the method are described. Examples of measurements of chemically modified antisense 19-mers are presented. PMID:7581844

  15. Effect of CD44 Suppression by Antisense Oligonucleotide on Attachment of Human Trabecular Meshwork Cells to HA

    李中国; 张虹

    2004-01-01

    The effects of suppression of CD44 by CD44-specific antisense oligonucleotide on attachment of human trabecular meshwork cells to hyaluronic acid (HA) were observed and the possible relationship between CD44 and primary open-angle glaucoma (POAG) investigated. CD44-specific antisense oligonucleotide was delivered with cationic lipid to cultured human trabecular meshwork cells. The expression of CD44 suppressed by CD44-specific antisense oligonucleotide was detected by RT-PCR and Western blotting. The effect of CD44 suppression by specific antisense oligonucleotide on attachment of trabecular meshwork cells to HA was measured by MTT assay. Results showed that expression of CD44 was suppressed by CD4, specific antisense oligonucleotide. Antisense oligonucleotide also suppressed the adhesion of human trabecular meshwork cells to HA in a concentration dependent manner. It was concluded that attachment of human trabecular meshwork cells to HA was decreased when CD44 was suppressed by specific antisense oligonucleotide. CD44might play a role in pathogenesis of POAG by affecting the adhesion of trabecular meshwork cells to HA.

  16. PCSK9 LNA antisense oligonucleotides induce sustained reduction of LDL cholesterol in nonhuman primates

    Lindholm, Marie W; Elmén, Joacim; Fisker, Niels; Hansen, Henrik; Persson, Hans Egon Robert; Møller, Dorte Marianne; Rosenbohm, Christoph; Ørum, Henrik; Straarup, Ellen Marie; Koch, Troels

    2012-01-01

    locked nucleic acid (LNA) antisense oligonucleotides targeting PCSK9 produce sustained reduction of LDL-C in nonhuman primates after a loading dose (20 mg/kg) and four weekly maintenance doses (5 mg/kg). PCSK9 messenger RNA (mRNA) and serum PCSK9 protein were reduced by 85% which resulted in a 50...

  17. Antisense oligonucleotide induction of progerin in human myogenic cells.

    Yue-Bei Luo

    Full Text Available We sought to use splice-switching antisense oligonucleotides to produce a model of accelerated ageing by enhancing expression of progerin, translated from a mis-spliced lamin A gene (LMNA transcript in human myogenic cells. The progerin transcript (LMNA Δ150 lacks the last 150 bases of exon 11, and is translated into a truncated protein associated with the severe premature ageing disease, Hutchinson-Gilford progeria syndrome (HGPS. HGPS arises from de novo mutations that activate a cryptic splice site in exon 11 of LMNA and result in progerin accumulation in tissues of mesodermal origin. Progerin has also been proposed to play a role in the 'natural' ageing process in tissues. We sought to test this hypothesis by producing a model of accelerated muscle ageing in human myogenic cells. A panel of splice-switching antisense oligonucleotides were designed to anneal across exon 11 of the LMNA pre-mRNA, and these compounds were transfected into primary human myogenic cells. RT-PCR showed that the majority of oligonucleotides were able to modify LMNA transcript processing. Oligonucleotides that annealed within the 150 base region of exon 11 that is missing in the progerin transcript, as well as those that targeted the normal exon 11 donor site induced the LMNA Δ150 transcript, but most oligonucleotides also generated variable levels of LMNA transcript missing the entire exon 11. Upon evaluation of different oligomer chemistries, the morpholino phosphorodiamidate oligonucleotides were found to be more efficient than the equivalent sequences prepared as oligonucleotides with 2'-O-methyl modified bases on a phosphorothioate backbone. The morpholino oligonucleotides induced nuclear localised progerin, demonstrated by immunostaining, and morphological nuclear changes typical of HGPS cells. We show that it is possible to induce progerin expression in myogenic cells using splice-switching oligonucleotides to redirect splicing of LMNA. This may offer a model

  18. Antisense Oligonucleotides: Treating Neurodegeneration at the Level of RNA

    DeVos, Sarah L.; Miller, Timothy M.

    2013-01-01

    Adequate therapies are lacking for Alzheimer’s disease, Parkinson’s disease, Huntington’s disease, amyotrophic lateral sclerosis, and other neurodegenerative diseases. The ability to use antisense oligonucleotides (ASOs) to target disease-associated genes by means of RNA may offer a potent approach for the treatment of these, and other, neurodegenerative disorders. In modifying the basic backbone chemistry, chemical groups, and target sequence, ASOs can act through numerous mechanisms to decr...

  19. Antitumor Activity of a Novel Antisense Oligonucleotide Against Akt1

    Yoon, Heejeong; Kim, Deog Joong; Ahn, Eun Hyun; Gellert, Ginelle C.; Shay, Jerry W.; Ahn, Chang-Ho; Lee, Young Bok

    2009-01-01

    The AKT pathway is an important therapeutic target for cancer drug discovery as it functions as a main point for transducing extracellular and intracellular oncogenic signals. Moreover, alternations of the AKT pathway have been found in a wide range of cancers. In the present study, we found that an Akt1 antisense oligonucleotide (Akt1 AO) significantly downregulated the expression of AKT1 at both the mRNA and protein levels and inhibited cellular growth at nanomolar concentrations in various...

  20. Advancements of antisense oligonucleotides in treatment of breast cancer

    YANGShuan-Ping; SONGSan-Tai; 等

    2003-01-01

    Breast cancer is one kind of multi-gene related malignancy.Overexpression of some oncogenes such as HER-2(c-erbB-2,Neu),bcl-2/bcl-xL,protein kinase A(PKA),and transferrin receptor gene(TfR gene),etc significantly affect the prognosis of breast cancer.It was shown that specific suppression of the overexpressed genes above resulted in the improvement of the therapy of breast cancer.Antisense interference.one of useful tools for inhibiting the overexpression of specific oncogenes,was involved in the therapy of breast cancer in recent years. Data indicated that antisense oligonucleotides(ON)could inhibit specially the expression of the target genes on mRNA or protein levels in most of cases;some ON candidates showed encouraging therapeutic effects in vitro and in vivo on breast cancer cell lines or xenografts.Furthermore,the combination use of the antisense ON and normal chemotherapeutic agents indicated synergistic antitumor effects,which was probably the best utilization of antisense ON in the treatment of breast cancer.

  1. Cytokines and therapeutic oligonucleotides.

    Hartmann, G; Bidlingmaier, M; Eigler, A; Hacker, U; Endres, S

    1997-12-01

    Therapeutic oligonucleotides - short strands of synthetic nucleic acids - encompass antisense and aptamer oligonucleotides. Antisense oligonucleotides are designed to bind to target RNA by complementary base pairing and to inhibit translation of the target protein. Antisense oligonucleotides enable specific inhibition of cytokine synthesis. In contrast, aptamer oligonucleotides are able to bind directly to specific proteins. This binding depends on the sequence of the oligonucleotide. Aptamer oligonucleotides with CpG motifs can exert strong immunostimulatory effects. Both kinds of therapeutic oligonucleotides - antisense and aptamer oligonucleotides - provide promising tools to modulate immunological functions. Recently, therapeutic oligonucleotides have moved towards clinical application. An antisense oligonucleotide directed against the proinflammatory intercellular adhesion molecule 1 (ICAM-1) is currently being tested in clinical trials for therapy of inflammatory disease. Immunostimulatory aptamer oligonucleotides are in preclinical development for immunotherapy. In the present review we summarize the application of therapeutic oligonucleotides to modulate immunological functions. We include technological aspects as well as current therapeutic concepts and clinical studies. PMID:9740353

  2. Respirable antisense oligonucleotides: a new drug class for respiratory disease

    Tanaka Makoto

    2000-12-01

    Full Text Available Abstract Respirable antisense oligonucleotides (RASONs, which attenuate specific disease-associated mRNAs, represent a new class of respiratory therapeutics with considerable potential. RASONs overcome previous obstacles that have impeded the development of antisense therapeutics targeting diseases in other organ systems. RASONs are delivered directly to the target tissue via inhalation; their uptake seems to be enhanced by cationic properties inherent in pulmonary surfactant, and, because of the markedly different target properties of mRNA and proteins, they can have very long durations of effect compared with traditional drugs targeting the protein of the same gene. RASONs contain chemical modifications that decrease their degradation by cellular nucleases. However, total insensitivity to nucleases is probably not an optimal design criterion for RASONs, because moderate nuclease sensitivity can prevent their systemic delivery, decreasing the potential for systemic toxicity. EPI-2010 is a 21-mer phosphorothioate RASON that attenuates bronchoconstriction, inflammation and surfactant depletion in preclinical models of human asthma, has a duration of effect of seven days, and seems to undergo minimal systemic delivery.

  3. Microinjection of antisense c-mos oligonucleotides prevents meiosis II in the maturing mouse egg.

    O'Keefe, S J; Wolfes, H; Kiessling, A A; Cooper, G M

    1989-01-01

    Injection of antisense oligonucleotides was used to investigate the function of c-mos in murine oocytes. Oocytes injected with antisense c-mos oligonucleotides completed the first meiotic division but failed to initiate meiosis II. Instead, loss of c-mos function led to chromosome decondensation, reformation of a nucleus after meiosis I, and cleavage to two cells. Therefore, c-mos is required for meiosis II during murine oocyte maturation.

  4. Reversal of phenotypes in MECP2 duplication mice using genetic rescue or antisense oligonucleotides.

    Sztainberg, Yehezkel; Chen, Hong-mei; Swann, John W; Hao, Shuang; Tang, Bin; Wu, Zhenyu; Tang, Jianrong; Wan, Ying-Wooi; Liu, Zhandong; Rigo, Frank; Zoghbi, Huda Y

    2015-12-01

    Copy number variations have been frequently associated with developmental delay, intellectual disability and autism spectrum disorders. MECP2 duplication syndrome is one of the most common genomic rearrangements in males and is characterized by autism, intellectual disability, motor dysfunction, anxiety, epilepsy, recurrent respiratory tract infections and early death. The broad range of deficits caused by methyl-CpG-binding protein 2 (MeCP2) overexpression poses a daunting challenge to traditional biochemical-pathway-based therapeutic approaches. Accordingly, we sought strategies that directly target MeCP2 and are amenable to translation into clinical therapy. The first question that we addressed was whether the neurological dysfunction is reversible after symptoms set in. Reversal of phenotypes in adult symptomatic mice has been demonstrated in some models of monogenic loss-of-function neurological disorders, including loss of MeCP2 in Rett syndrome, indicating that, at least in some cases, the neuroanatomy may remain sufficiently intact so that correction of the molecular dysfunction underlying these disorders can restore healthy physiology. Given the absence of neurodegeneration in MECP2 duplication syndrome, we propose that restoration of normal MeCP2 levels in MECP2 duplication adult mice would rescue their phenotype. By generating and characterizing a conditional Mecp2-overexpressing mouse model, here we show that correction of MeCP2 levels largely reverses the behavioural, molecular and electrophysiological deficits. We also reduced MeCP2 using an antisense oligonucleotide strategy, which has greater translational potential. Antisense oligonucleotides are small, modified nucleic acids that can selectively hybridize with messenger RNA transcribed from a target gene and silence it, and have been successfully used to correct deficits in different mouse models. We find that antisense oligonucleotide treatment induces a broad phenotypic rescue in adult

  5. Quality assurance of radiolabeled proteins, peptides and antisense oligonucleotides

    Radiopharmaceuticals (RP) labeled with nonmetallic (I-123, C-11, F-18) and metallic radionuclides (Tc-99m, Ga-67, In-111) are used for diagnosis and therapy; they could be classified as blood flow markers, metabolic substrates, receptor ligands, peptide/proteins and antisense oligonucleotide analogs (I-123, In-111). For safety and efficacy of the test using these tracers, quality assurance (QA) of RP (Chemical, radionuclidic, radiochemical impurities, enantiomers, immunoreactivity, sterility, apyrogenicity, cell-viability) is required. This test is more critical for the RP under clinical investigations. FDA allows a maximum permissible limit of 10% of the injected radionuclide as impurity. Quality assurance of RP is carried out by thin-layer, size-exclusion and high pressure liquid chromatography. For therapeutic RP labeled with I-131 (β,γ), Re-186 (β,γ), Re-188 (β), Y-90 (β), Y-90 (β), At-211(α) and Bi-212 (α), etc., the level of chemical alterations/degradations, directly by energetic particles or indirectly by free-radicals, is higher for the α-,β- than γ-emitting RP and chemical alterations are time-dependent processes. Considering the adverse reactions (marrow-suppression), unnecessary radiation due to unbound tracers and impurities, QA of RP should be performed and impurities eliminated before RP administration

  6. Bolaamphiphile-based nanocomplex delivery of phosphorothioate gapmer antisense oligonucleotides as a treatment for Clostridium difficile

    Hegarty, John P; Krzeminski, Jacek; Sharma, Arun K; Guzman-Villanueva, Diana; Weissig, Volkmar; Stewart, David B

    2016-01-01

    Despite being a conceptually appealing alternative to conventional antibiotics, a major challenge toward the successful implementation of antisense treatments for bacterial infections is the development of efficient oligonucleotide delivery systems. Cationic vesicles (bolasomes) composed of dequalinium chloride (“DQAsomes”) have been used to deliver plasmid DNA across the cardiolipin-rich inner membrane of mitochondria. As cardiolipin is also a component of many bacterial membranes, we investigated the application of cationic bolasomes to bacteria as an oligonucleotide delivery system. Antisense sequences designed in silico to target the expression of essential genes of the bacterial pathogen, Clostridium difficile, were synthesized as 2′-O-methyl phosphorothioate gapmer antisense oligonucleotides (ASO). These antisense gapmers were quantitatively assessed for their ability to block mRNA translation using luciferase reporter and C. difficile protein expression plasmid constructs in a coupled transcription–translation system. Cationic bolaamphiphile compounds (dequalinium derivatives) of varying alkyl chain length were synthesized and bolasomes were prepared via probe sonication of an aqueous suspension. Bolasomes were characterized by particle size distribution, zeta potential, and binding capacities for anionic oligonucleotide. Bolasomes and antisense gapmers were combined to form antisense nanocomplexes. Anaerobic C. difficile log phase cultures were treated with serial doses of gapmer nanocomplexes or equivalent amounts of empty bolasomes for 24 hours. Antisense gapmers for four gene targets achieved nanomolar minimum inhibitory concentrations for C. difficile, with the lowest values observed for oligonucleotides targeting polymerase genes rpoB and dnaE. No inhibition of bacterial growth was observed from treatments at matched dosages of scrambled gapmer nanocomplexes or plain, oligonucleotide-free bolasomes compared to untreated control cultures. We

  7. Therapeutic Antisense Oligonucleotides against Cancer: Hurdling to the Clinic

    Moreno, Pedro; Pêgo, Ana

    2014-10-01

    Under clinical development since the early 90’s and with two successfully approved drugs (Fomivirsen and Mipomersen), oligonucleotide-based therapeutics have not yet delivered a clinical drug to the market in the cancer field. Whilst many pre-clinical data has been generated, a lack of understanding still exists on how to efficiently tackle all the different challenges presented for cancer targeting in a clinical setting. Namely, effective drug vectorization, careful choice of target gene or synergistic multi-gene targeting are surely decisive, while caution must be exerted to avoid potential toxic, often misleading off-target-effects. Here a brief overview will be given on the nucleic acid chemistry advances that established oligonucleotide technologies as a promising therapeutic alternative and ongoing cancer related clinical trials. Special attention will be given towards a perspective on the hurdles encountered specifically in the cancer field by this class of therapeutic oligonucleotides and a view on possible avenues for success is presented, with particular focus on the contribution from nanotechnology to the field.

  8. Antitumor effects of radioiodinated antisense oligonucleotide mediated by VIP receptor

    Purpose: we had constructed a targeting delivery system based on intestinal peptide (VIP) for antisense oligonucleotide (ASON) transfer into VIP receptor-positive cells in previous study. The aims of present studies are to observe the antitumor effect of VIP-131I-ASON in HT29 human colon adenocarcinoma xenografts. Methods: A 15-met phosphorothioate ASON, which was complementary to the translation start region of the C-myc oncogene mRNA, was labeled with 131I and the labelled compound was linked to the VIP bound covalently 'to a polylysine chain so as to deliver oligonucleotide into tumor cells. Distribution experiments for evaluating the radiolabeled antisense complexe uptake in tumor tissue were performed in BALB/c nude mice bearing with HT29 tumor xenografts. Nude mice beating HT29 tumor xenografts were adminstered VIP-131I-ASON (3.7,7.4 MBq) or 131I-ASON (3.7 MBq), 131I labeled control sense and nosense DNA (3.7 MBq), or saline. Antitumor effects were assessed using endpoints of tumor growth delay. C-myc-encoded protein expression of tumor was measured by immunocytohistochemical staining. Results: Distribution experiment performed with athymic mice bearing human colon tumor xenografts revealed maximal accumulation of conjugated ASON in the tumor tissue 2 h after administration and significantly higher than that in nude mice injected unconjngated ASON [(5.89±1.03)%ID/g and(1.56±0.31)%ID/g, respectively; t=7.7954 P<0.001]. The radioratio of tumor to muscle was peaked 4h after administration. VIP-131I-ASON exhibited strong antitumor effects against HT29 xenografts, decreasing their growth rate 7-fold compare with that in saline-treated mice(tumor growth delay, 25.4±0.89 day). The antitumor effects of unconjugated 131I-ASON were much less profound than VIP-131I-ASON (tumor growth delay, 3.2±1.3 and 25.4±0.89 day, respectively; q=51.4126 P<0.01). Sense, nosense control ON with VIP carder caused no therapeutic effect. There was no progressive weight loss or

  9. Repair of Thalassemic Human β -globin mRNA in Mammalian Cells by Antisense Oligonucleotides

    Sierakowska, Halina; Sambade, Maria J.; Agrawal, Sudhir; Kole, Ryszard

    1996-11-01

    In one form of β -thalassemia, a genetic blood disorder, a mutation in intron 2 of the β -globin gene (IVS2-654) causes aberrant splicing of β -globin pre-mRNA and, consequently, β -globin deficiency. Treatment of mammalian cells stably expressing the IVS2-654 human β -globin gene with antisense oligonucleotides targeted at the aberrant splice sites restored correct splicing in a dose-dependent fashion, generating correct human β -globin mRNA and polypeptide. Both products persisted for up to 72 hr posttreatment. The oligonucleotides modified splicing by a true antisense mechanism without overt unspecific effects on cell growth and splicing of other pre-mRNAs. This novel approach in which antisense oligonucleotides are used to restore rather than to down-regulate the activity of the target gene is applicable to other splicing mutants and is of potential clinical interest.

  10. Study of HIV-2 primer-template initiation complex using antisense oligonucleotides

    Boulmé, F; Freund, F; Gryaznov, S;

    2000-01-01

    HIV-2 reverse transcription is initiated by the retroviral DNA polymerase (reverse transcriptase) from a cellular tRNALys3 partially annealed to the primer binding site in the 5'-region of viral RNA. The HIV-2 genome has two A-rich regions upstream of the primer binding site. In contrast to HIV-1...... approach, first validated in our in vitro HIV-1 reverse transcription system. Annealing of the antisense oligonucleotides to the pre-primer binding site (the upstream region contiguous to the HIV-2 primer binding site) was determined in the presence of native tRNALys3 or synthetic primers. Using natural...... and chemically modified antisense oligonucleotides we found that interactions between the anticodon of tRNALys3 and an A-rich loop of viral RNA led to an important destabilization of the pre-primer binding site; this region became accessible to anti-pre-primer binding site oligonucleotides in a...

  11. THE EFFECT OF ANTISENSE OLIGONUCLEOTIDE ON THE INTERLEUKIN-5 IN THE SUPERNATANTS OF SPLEEN CELL CULTURES OF ASTHMATIC MICE

    王美琴; 白春学; 钮善福; 方晓惠; 陈常庆; 陈波

    2001-01-01

    To explore the effect of antisense oligonucleotide on the production of IL-5 by mouse spleen T lymphocytes.Methods Based on the IL-5 cDNA sequence of mouse, a segment of antisense oligonucleotide was designed and synthesized. 5’-labeling of antisense oligonucleotide was signed by T4 PNK in order that the efficiency of stearylamine liposome in transfecting antisense oligonucleotide can be evaluated. Asthma model was duplicated with ovalbumin(OVA) absorbed to aluminum hydroxide. T lymphocytes of mice were separated by nylon fiber method, then T lymphocytes transfected with different concentration of antisense oligonucleotide with cation stearylamine liposme were incubated respectively in order to observe the effect of antisense oligonucleotide on Il-5 production by T lymphocytes. IL-5 levels in the supernatants of T lymphocyte cultures were determined by ELISA.Results Stearylamine liposome could markedly increase the efficiency of antisense oligonucleotide transfection. The transfection efficiency of antisense oligouncleotide increased approximately 12 times at a ratio of 1: 15m/m (antisense oligonucleotide to SA liposome). In healthy and asthma Balb/c mice, IL-5 was not detectable in the supernatants of T lymphocyte cultures without stimulated with OVA; however, IL-5 was increased markedly in the supernatants of T lymphocyte cultures stimulated with OVA. After transfection with different concentrations of antisense oligonucleotide, IL-5 levels in the supernatants of T lymphocyte cultures were significantly lower than those in control cultured without antisense oligonucleotide transfection. IL-5 levels decreased from 44.60±6.23 pg/ml to 30.70±7.362 pg/ml, 17.20±6.181 pg/ml and 8.16±2.34 pg/ml respectively. And IL-5 synthesis was inhibited by 31.17%, 61.43% and 81.7% respectively.Conclusion IL-5 synthesis could be obviously inhibited by antisense oligonucleotide and showed a markedly correlation between dose and effectiveness. It suggests the production

  12. Effects of HSP70 Antisense Oligonucleotide on the Proliferation and Apoptosis of Human Hepatocellular Carcinoma Cells

    杨雪; 贺海斌; 杨威; 宋涛; 郭成; 郑鑫; 刘青光

    2010-01-01

    The study investigated the effects of heat shock protein 70(HSP70) antisense oligonucleotide(ASODN) on the proliferation and apoptosis of a human hepatocellular carcinoma cell line(SMMC-7721 cells) in vitro.HSP70 oligonucleotide was transfected into SMMC-7721 cells by the mediation of SofastTM transfection reagent.Inhibition rate of SMMC-7721 cells was determined by using MTT method.Apoptosis rate and cell cycle distribution were measured by flow cytometry.Immunocytochemistry staining was used to observe th...

  13. Nanoparticle Delivery of Antisense Oligonucleotides and Their Application in the Exon Skipping Strategy for Duchenne Muscular Dystrophy

    Falzarano, Maria Sofia; Passarelli, Chiara; Ferlini, Alessandra

    2014-01-01

    Antisense therapy is a powerful tool for inducing post-transcriptional modifications and thereby regulating target genes associated with disease. There are several classes of antisense oligonucleotides (AONs) with therapeutic use, such as double-stranded RNAs (interfering RNAs, utilized for gene silencing, and single-stranded AONs with various chemistries, which are useful for antisense targeting of micro-RNAs and mRNAs. In particular, the use of AONs for exon skipping, by targeting pre-mRNA,...

  14. Antisense Oligonucleotide-Mediated Exon Skipping for Duchenne Muscular Dystrophy: Progress and Challenges.

    Arechavala-Gomeza, V.; Anthony, K.; Morgan, J; Muntoni, F.

    2012-01-01

    Duchenne muscular dystrophy (DMD) is the most common childhood neuromuscular disorder. It is caused by mutations in the DMD gene that disrupt the open reading frame (ORF) preventing the production of functional dystrophin protein. The loss of dystrophin ultimately leads to the degeneration of muscle fibres, progressive weakness and premature death. Antisense oligonucleotides (AOs) targeted to splicing elements within DMD pre-mRNA can induce the skipping of targeted exons, restoring the ORF an...

  15. Specific inhibition of hepatitis B virus gene expression by an antisense oligonucleotide in vitro

    It was previously shown that a number of antisense oligonucleotides against hepatitis B virus (HBV) mRNAa were highly effective in inhibition of HBV gene expression. Here, using radioisotope techniques, we report a specific inhibition of HBV surface antigen (HBsAg) production in vitro by 2.2.15 cells (Hep-G2 cells transfected with HBV genome) by the antisense oligonucleotide 15-S-asON, a 15-mer phosphorothioate analogue complementary to the cap site of the SPII promoter of HBV mRNA, ar a concentration of 2 - 5 :m:mol/l. After 24 and 48 hours of incubation of cells with 15-S-asON, the intracellular concentration of the latter rose to 69.4 and 75.8 nmol/l, respectively, and the HBsAg level assayed by ELISA was reduced by 50.0% and 70.6%, respectively. The results were checked by use of the radio-immunoprecipitation method: 2.2.15 cells exposed to 15-S-asON and labelled with [35S]-methionine for 48 hours showed a decrease of the HBsAg level by 81.26% but almost none of the total proteins. No cytotoxicity of the 15-S-asON was observed with regard to the cell morphology and growth. These results indicate that the tested antisense oligonucleotide specifically inhibits the HBV gene expression. (author)

  16. Antisense oligonucleotide for tissue factor inhibits hepatic ischemic reperfusion injury.

    Nakamura, Kenji; Kadotani, Yayoi; Ushigome, Hidetaka; Akioka, Kiyokazu; Okamoto, Masahiko; Ohmori, Yoshihiro; Yaoi, Takeshi; Fushiki, Shinji; Yoshimura, Rikio; Yoshimura, Norio

    2002-09-27

    Tissue factor (TF) is an initiation factor for blood coagulation and its expression is induced on endothelial cells during inflammatory or immune responses. We designed an antisense oligodeoxynucleotide (AS-1/TF) for rat TF and studied its effect on hepatic ischemic reperfusion injury. AS-1/TF was delivered intravenously to Lewis rats. After 10 h, hepatic artery and portal vein were partially clamped. Livers were reperfused after 180 min and harvested. TF expression was studied using immunohistochemical staining. One of 10 rats survived in a 5-day survival rate and TF was strongly stained on endothelial cells in non-treatment group. However, by treatment with AS-1/TF, six of seven survived and TF staining was significantly reduced. Furthermore, we observed that fluorescein-labeled AS-1/TF was absorbed into endothelial cells. These results suggest that AS-1/TF can strongly suppress the expression of TF and thereby inhibit ischemic reperfusion injury to the rat liver. PMID:12270110

  17. Advances in Antisense Oligonucleotide Development for Target Identification, Validation, and as Novel Therapeutics

    Moizza Mansoor

    2008-01-01

    Full Text Available Antisense oligonucleotides (As-ODNs are single stranded, synthetically prepared strands of deoxynucleotide sequences, usually 18–21 nucleotides in length, complementary to the mRNA sequence of the target gene. As-ODNs are able to selectively bind cognate mRNA sequences by sequence-specific hybridization. This results in cleavage or disablement of the mRNA and, thus, inhibits the expression of the target gene. The specificity of the As approach is based on the probability that, in the human genome, any sequence longer than a minimal number of nucleotides (nt, 13 for RNA and 17 for DNA, normally occurs only once. The potential applications of As-ODNs are numerous because mRNA is ubiquitous and is more accessible to manipulation than DNA. With the publication of the human genome sequence, it has become theoretically possible to inhibit mRNA of almost any gene by As-ODNs, in order to get a better understanding of gene function, investigate its role in disease pathology and to study novel therapeutic targets for the diseases caused by dysregulated gene expression. The conceptual simplicity, the availability of gene sequence information from the human genome, the inexpensive availability of synthetic oligonucleotides and the possibility of rational drug design makes As-ODNs powerful tools for target identification, validation and therapeutic intervention. In this review we discuss the latest developments in antisense oligonucleotide design, delivery, pharmacokinetics and potential side effects, as well as its uses in target identification and validation, and finally focus on the current developments of antisense oligonucleotides in therapeutic intervention in various diseases.

  18. Antisense oligonucleotide therapy for the treatment of C9ORF72 ALS/FTD diseases.

    Riboldi, Giulietta; Zanetta, Chiara; Ranieri, Michela; Nizzardo, Monica; Simone, Chiara; Magri, Francesca; Bresolin, Nereo; Comi, Giacomo P; Corti, Stefania

    2014-12-01

    Motor neuron disorders, and particularly amyotrophic lateral sclerosis (ALS), are fatal diseases that are due to the loss of motor neurons in the brain and spinal cord, with progressive paralysis and premature death. It has been recently shown that the most frequent genetic cause of ALS, frontotemporal dementia (FTD), and other neurological diseases is the expansion of a hexanucleotide repeat (GGGGCC) in the non-coding region of the C9ORF72 gene. The pathogenic mechanisms that produce cell death in the presence of this expansion are still unclear. One of the most likely hypotheses seems to be the gain-of-function that is achieved through the production of toxic RNA (able to sequester RNA-binding protein) and/or toxic proteins. In recent works, different authors have reported that antisense oligonucleotides complementary to the C9ORF72 RNA transcript sequence were able to significantly reduce RNA foci generated by the expanded RNA, in affected cells. Here, we summarize the recent findings that support the idea that the buildup of "toxic" RNA containing the GGGGCC repeat contributes to the death of motor neurons in ALS and also suggest that the use of antisense oligonucleotides targeting this transcript is a promising strategy for treating ALS/frontotemporal lobe dementia (FTLD) patients with the C9ORF72 repeat expansion. These data are particularly important, given the state of the art antisense technology, and they allow researchers to believe that a clinical application of these discoveries will be possible soon. PMID:24809691

  19. Efficient inhibition of human telomerase activity by antisense oligonucleotides sensitizes cancer cells to radiotherapy

    Xue-mei JI; Cong-hua XIE; Ming-hao FANG; Fu-xiang ZHOU; Wen-jie ZHANG; Ming-sheng ZHANG; Yun-feng ZHOU

    2006-01-01

    Aim: To investigate the effect of the antisense oligonucleotides (ASODN) specific for human telomerase RNA (hTR) on radio sensitization and proliferation inhibition in human neurogliocytoma cells (U251). Methods: U251 cells were transfected with hTR ASODN or nonspecific oligonucleotides (NSODN). Before and after irradiation of 60Co-γray, telomerase activity was assayed by telomeric repeat amplification protocol (TRAP-PCR-ELISA), and DNA damage and repair were examined by the comet assay. The classical colony assay was used to plot the cell-survival curve, to detect the D0 value. Results: hTR antisense oligonucleotides could downregulate the telomerase activity, increase radiation induced DNA damage and reduce the subsequent repair. Furthermore, it could inhibit the proliferation and decrease the D0 value which demonstrates rising radiosensitivity. However, telomere length was unchanged over a short period of time. Conclusion: These findings suggest that an ASODN-based strategy may be used to develop telomerase inhibitors, which can efficiently sensitize radiotherapy.

  20. Hsp90 protein interacts with phosphorothioate oligonucleotides containing hydrophobic 2'-modifications and enhances antisense activity.

    Liang, Xue-Hai; Shen, Wen; Sun, Hong; Kinberger, Garth A; Prakash, Thazha P; Nichols, Joshua G; Crooke, Stanley T

    2016-05-01

    RNase H1-dependent antisense oligonucleotides (ASOs) are chemically modified to enhance pharmacological properties. Major modifications include phosphorothioate (PS) backbone and different 2'-modifications in 2-5 nucleotides at each end (wing) of an ASO. Chemical modifications can affect protein binding and understanding ASO-protein interactions is important for better drug design. Recently we identified many intracellular ASO-binding proteins and found that protein binding could affect ASO potency. Here, we analyzed the structure-activity-relationships of ASO-protein interactions and found 2'-modifications significantly affected protein binding, including La, P54nrb and NPM. PS-ASOs containing more hydrophobic 2'-modifications exhibit higher affinity for proteins in general, although certain proteins, e.g. Ku70/Ku80 and TCP1, are less affected by 2'-modifications. We found that Hsp90 protein binds PS-ASOs containing locked-nucleic-acid (LNA) or constrained-ethyl-bicyclic-nucleic-acid ((S)-cEt) modifications much more avidly than 2'-O-methoxyethyl (MOE). ASOs bind the mid-domain of Hsp90 protein. Hsp90 interacts with more hydrophobic 2' modifications, e.g. (S)-cEt or LNA, in the 5'-wing of the ASO. Reduction of Hsp90 protein decreased activity of PS-ASOs with 5'-LNA or 5'-cEt wings, but not with 5'-MOE wing. Together, our results indicate Hsp90 protein enhances the activity of PS/LNA or PS/(S)-cEt ASOs, and imply that altering protein binding of ASOs using different chemical modifications can improve therapeutic performance of PS-ASOs. PMID:26945041

  1. Antisense oligonucleotide to insulin—like growth factor Ⅱ induces apotosis in human ovarian cancer AO cell line

    YINDELING; LUPU; 等

    1998-01-01

    The effects of antisense oligonucleotide to insulin0like growth factor -Ⅱ(IGFⅡ)to induce apotosis in human ovarian cancer cells were evaluated.Antiproliferation effects of antisense to IGFⅡin ovarian cancer AO cells were determined by 3H-thymidine incorporation.Apoptosis of the IGFⅡ antisense-treated cells was quantitated by both nuclear condensation and flow cytometry after cells were stained with propidium iodide,IGFⅡ antisense(4.5μM) treatment of 48h maximally inhibited proliferation of AO cells,More than 25% of IGFⅡantisense-treated cells(4.5μM for 24h) had undergone apoptosis,whereas less than 3% of the cells were apoptotic in either IGFⅡ sense-treated cells or untreated cells.Antisense oligonucleotide to IGFⅡ significantly inhibited cell proliferation and induced apoptosis in human ovarian cancer AO cell.These data suggest that IGFII may be a potential target in treatment of ovarian cancer and antisense oligonucleotide to IGFⅡ may serve as a therapeutic approach.

  2. Effect of Terminal Groups of Dendrimers in the Complexation with Antisense Oligonucleotides and Cell Uptake

    Márquez-Miranda, Valeria; Peñaloza, Juan Pablo; Araya-Durán, Ingrid; Reyes, Rodrigo; Vidaurre, Soledad; Romero, Valentina; Fuentes, Juan; Céric, Francisco; Velásquez, Luis; González-Nilo, Fernando D.; Otero, Carolina

    2016-02-01

    Poly(amidoamine) dendrimers are the most recognized class of dendrimer. Amino-terminated (PAMAM-NH2) and hydroxyl-terminated (PAMAM-OH) dendrimers of generation 4 are widely used, since they are commercially available. Both have different properties, mainly based on their different overall charges at physiological pH. Currently, an important function of dendrimers as carriers of short single-stranded DNA has been applied. These molecules, known as antisense oligonucleotides (asODNs), are able to inhibit the expression of a target mRNA. Whereas PAMAM-NH2 dendrimers have shown to be able to transfect plasmid DNA, PAMAM-OH dendrimers have not shown the same successful results. However, little is known about their interaction with shorter and more flexible molecules such as asODNs. Due to several initiatives, the use of these neutral dendrimers as a scaffold to introduce other functional groups has been proposed. Because of its low cytotoxicity, it is relevant to understand the molecular phenomena involving these types of dendrimers. In this work, we studied the behavior of an antisense oligonucleotide in presence of both types of dendrimers using molecular dynamics simulations, in order to elucidate if they are able to form stable complexes. In this manner, we demonstrated at atomic level that PAMAM-NH2, unlike PAMAM-OH, could form a well-compacted complex with asODN, albeit PAMAM-OH can also establish stable interactions with the oligonucleotide. The biological activity of asODN in complex with PAMAM-NH2 dendrimer was also shown. Finally, we revealed that in contact with PAMAM-OH, asODN remains outside the cells as TIRF microscopy results showed, due to its poor interaction with this dendrimer and cell membranes.

  3. Effect of Terminal Groups of Dendrimers in the Complexation with Antisense Oligonucleotides and Cell Uptake.

    Márquez-Miranda, Valeria; Peñaloza, Juan Pablo; Araya-Durán, Ingrid; Reyes, Rodrigo; Vidaurre, Soledad; Romero, Valentina; Fuentes, Juan; Céric, Francisco; Velásquez, Luis; González-Nilo, Fernando D; Otero, Carolina

    2016-12-01

    Poly(amidoamine) dendrimers are the most recognized class of dendrimer. Amino-terminated (PAMAM-NH2) and hydroxyl-terminated (PAMAM-OH) dendrimers of generation 4 are widely used, since they are commercially available. Both have different properties, mainly based on their different overall charges at physiological pH. Currently, an important function of dendrimers as carriers of short single-stranded DNA has been applied. These molecules, known as antisense oligonucleotides (asODNs), are able to inhibit the expression of a target mRNA. Whereas PAMAM-NH2 dendrimers have shown to be able to transfect plasmid DNA, PAMAM-OH dendrimers have not shown the same successful results. However, little is known about their interaction with shorter and more flexible molecules such as asODNs. Due to several initiatives, the use of these neutral dendrimers as a scaffold to introduce other functional groups has been proposed. Because of its low cytotoxicity, it is relevant to understand the molecular phenomena involving these types of dendrimers. In this work, we studied the behavior of an antisense oligonucleotide in presence of both types of dendrimers using molecular dynamics simulations, in order to elucidate if they are able to form stable complexes. In this manner, we demonstrated at atomic level that PAMAM-NH2, unlike PAMAM-OH, could form a well-compacted complex with asODN, albeit PAMAM-OH can also establish stable interactions with the oligonucleotide. The biological activity of asODN in complex with PAMAM-NH2 dendrimer was also shown. Finally, we revealed that in contact with PAMAM-OH, asODN remains outside the cells as TIRF microscopy results showed, due to its poor interaction with this dendrimer and cell membranes. PMID:26847692

  4. Peripheral reduction of FGFR4 with antisense oligonucleotides increases metabolic rate and lowers adiposity in diet-induced obese mice.

    Xing Xian Yu

    Full Text Available Obesity is a primary risk factor for multiple metabolic disorders. Many drugs for the treatment of obesity, which mainly act through CNS as appetite suppressants, have failed during development or been removed from the market due to unacceptable adverse effects. Thus, there are very few efficacious drugs available and remains a great unmet medical need for anti-obesity drugs that increase energy expenditure by acting on peripheral tissues without severe side effects. Here, we report a novel approach involving antisense inhibition of fibroblast growth factor receptor 4 (FGFR4 in peripheral tissues. Treatment of diet-induce obese (DIO mice with FGFR4 antisense oligonucleotides (ASO specifically reduced liver FGFR4 expression that not only resulted in decrease in body weight (BW and adiposity in free-feeding conditions, but also lowered BW and adiposity under caloric restriction. In addition, combination treatment with FGFR4 ASO and rimonabant showed additive reduction in BW and adiposity. FGFR4 ASO treatment increased basal metabolic rate during free-feeding conditions and, more importantly, prevented adaptive decreases of metabolic rate induced by caloric restriction. The treatment increased fatty acid oxidation while decreased lipogenesis in both liver and fat. Mechanistic studies indicated that anti-obesity effect of FGFR4 ASO was mediated at least in part through an induction of plasma FGF15 level resulted from reduction of hepatic FGFR4 expression. The anti-obesity effect was accompanied by improvement in plasma glycemia, whole body insulin sensitivity, plasma lipid levels and liver steatosis. Therefore, FGFR4 could be a potential novel target and antisense reduction of hepatic FGFR4 expression could be an efficacious therapy as an adjunct to diet restriction or to an appetite suppressant for the treatment of obesity and related metabolic disorders.

  5. A cytoplasmic pathway for gapmer antisense oligonucleotide-mediated gene silencing in mammalian cells

    Castanotto, Daniela; Lin, Min; Kowolik, Claudia; Wang, LiAnn; Ren, Xiao-Qin; Soifer, Harris S.; Koch, Troels; Hansen, Bo Rode; Oerum, Henrik; Armstrong, Brian; Wang, Zhigang; Bauer, Paul; Rossi, John; Stein, C.A.

    2015-01-01

    Antisense oligonucleotides (ASOs) are known to trigger mRNA degradation in the nucleus via an RNase H-dependent mechanism. We have now identified a putative cytoplasmic mechanism through which ASO gapmers silence their targets when transfected or delivered gymnotically (i.e. in the absence of any transfection reagent). We have shown that the ASO gapmers can interact with the Ago-2 PAZ domain and can localize into GW-182 mRNA-degradation bodies (GW-bodies). The degradation products of the targeted mRNA, however, are not generated by Ago-2-directed cleavage. The apparent identification of a cytoplasmic pathway complements the previously known nuclear activity of ASOs and concurrently suggests that nuclear localization is not an absolute requirement for gene silencing. PMID:26433227

  6. Multi-exon Skipping Using Cocktail Antisense Oligonucleotides in the Canine X-linked Muscular Dystrophy.

    Miskew Nichols, Bailey; Aoki, Yoshitsugu; Kuraoka, Mutsuki; Lee, Joshua J A; Takeda, Shin'ichi; Yokota, Toshifumi

    2016-01-01

    Duchenne muscular dystrophy (DMD) is one of the most common lethal genetic diseases worldwide, caused by mutations in the dystrophin (DMD) gene. Exon skipping employs short DNA/RNA-like molecules called antisense oligonucleotides (AONs) that restore the reading frame and produce shorter but functional proteins. However, exon skipping therapy faces two major hurdles: limited applicability (up to only 13% of patients can be treated with a single AON drug), and uncertain function of truncated proteins. These issues were addressed with a cocktail AON approach. While approximately 70% of DMD patients can be treated by single exon skipping (all exons combined), one could potentially treat more than 90% of DMD patients if multiple exon skipping using cocktail antisense drugs can be realized. The canine X-linked muscular dystrophy (CXMD) dog model, whose phenotype is more similar to human DMD patients, was used to test the systemic efficacy and safety of multi-exon skipping of exons 6 and 8. The CXMD dog model harbors a splice site mutation in intron 6, leading to a lack of exon 7 in dystrophin mRNA. To restore the reading frame in CXMD requires multi-exon skipping of exons 6 and 8; therefore, CXMD is a good middle-sized animal model for testing the efficacy and safety of multi-exon skipping. In the current study, a cocktail of antisense morpholinos targeting exon 6 and exon 8 was designed and it restored dystrophin expression in body-wide skeletal muscles. Methods for transfection/injection of cocktail oligos and evaluation of the efficacy and safety of multi-exon skipping in the CXMD dog model are presented. PMID:27285612

  7. Small antisense oligonucleotides against G-quadruplexes: specific mRNA translational switches

    Rouleau, Samuel G.; Beaudoin, Jean-Denis; Bisaillon, Martin; Perreault, Jean-Pierre

    2015-01-01

    G-quadruplexes (G4) are intricate RNA structures found throughout the transcriptome. Because they are associated with a variety of biological cellular mechanisms, these fascinating structural motifs are seen as potential therapeutic targets against many diseases. While screening of chemical compounds specific to G4 motifs has yielded interesting results, no single compound successfully discriminates between G4 motifs based on nucleotide sequences alone. This level of specificity is best attained using antisense oligonucleotides (ASO). Indeed, oligonucleotide-based strategies are already used to modulate DNA G4 folding in vitro. Here, we report that, in human cells, the use of short ASO to promote and inhibit RNA G4 folding affects the translation of specific mRNAs, including one from the 5′UTR of the H2AFY gene, a histone variant associated with cellular differentiation and cancer. These results suggest that the relatively high specificity of ASO-based strategies holds significant potential for applications aimed at modulating G4-motif folding. PMID:25510493

  8. Depletion of Bcl-2 by an antisense oligonucleotide induces apoptosis accompanied by oxidation and externalization of phosphatidylserine in NCI-H226 lung carcinoma cells.

    Koty, Patrick P; Tyurina, Yulia Y; Tyurin, Vladimir A; Li, Shang-Xi; Kagan, Valerian E

    2002-01-01

    Oxidant-induced apoptosis involves oxidation of many different and essential molecules including phospholipids. As a result of this non-specific oxidation, any signaling role of a particular phospholipid-class of molecules is difficult to elucidate. To determine whether preferential oxidation of phosphatidylserine (PS) is an early event in apoptotic signaling related to PS externalization and is independent of direct oxidant exposure, we chose a genetic-based induction of apoptosis. Apoptosis was induced in the lung cancer cell line NCI-H226 by decreasing the amount of Bcl-2 protein expression by preventing the translation of bcl-2 mRNA using an antisense bcl-2 oligonucleotide. Peroxidation of phospholipids was assayed using a fluorescent technique based on metabolic integration of an oxidation-sensitive and fluorescent fatty acid, cis-parinaric acid (PnA), into cellular phospholipids and subsequent HPLC separation of cis-PnA-labeled phospholipids. We found a decrease in Bcl-2 was associated with a selective oxidation of PS in a sub-population of the cells with externalized PS. No significant difference in oxidation of cis-PnA-labeled phospholipids was observed in cells treated with medium alone or a nonsense oligonucleotide. Treatment with either nonsensc or antisense bcl-2 oligonucleotides was not associated with changes in the pattern of individual phospholipid classes as determined by HPTLC. These metabolic and topographical changes in PS arrangement in plasma membrane appear to be early responses to antisense bcl-2 exposure that trigger a PS-dependent apoptotic signaling pathway. This observed externalization of PS may facilitate the 'labeling' of apoptotic cells for recognition by macrophage scavenger receptors and subsequent phagocytic clearance. PMID:12162425

  9. Kinetics and mechanisms of steps in anti-sense oligonucleotide synthesis

    Russell, Mark A.

    2007-01-01

    Mechanistic studies are reported for the detritylation, coupling and sulphurisation reactions involved in oligonucleotide synthesis by the phosphoramidite method. Detritylation is the acid catalysed removal of a 4,4-dimethoxytrityl protecting group from the 5' protected nucleotide to give the 5' deprotected nucleotide and the 4,4- dimethoxytrityl carbocation. In the absence of water and at high acid concentrations the equilibrium favours carbocation formation. Equilibrium profi...

  10. Down-regulation of protein kinase Ceta by antisense oligonucleotides sensitises A549 lung cancer cells to vincristine and paclitaxel.

    Sonnemann, Jürgen; Gekeler, Volker; Ahlbrecht, Katrin; Brischwein, Klaus; Liu, Chao; Bader, Peter; Müller, Cornelia; Niethammer, Dietrich; Beck, James F

    2004-06-25

    Previous studies point to protein kinase C (PKC) isozyme eta as a resistance factor in cancer cells. Therefore, we investigated whether down-regulation of PKCeta with second generation antisense oligonucleotides (ODNs) would sensitise A549 human lung carcinoma cells to cytostatics. The effects were compared to the outcome of Bcl-xL down-regulation. Upon treatment with antisense ODNs, PKCeta and Bcl-xL were both significantly reduced on mRNA and protein level. Down-regulation of either PKCeta or Bcl-xL in combination with vincristine or paclitaxel resulted in a significant increase in caspase-3 activity compared to that in the control oligonucleotide treated cells. In addition, PKCeta down-regulation augmented vincristine-induced dissipation of mitochondrial transmembrane potential. In conclusion, these results confirm that PKCeta might represent a considerable resistance factor and an interesting target to improve anticancer chemotherapy. PMID:15159020

  11. Antisense oligonucleotides-induced local blockade of T-bet expression leads to airway inflammation in rats

    Gang WANG; Chun-tao LIU; Zeng-li WANG; Li-li JIANG; Cuniang YAN; Feng-min LUO

    2006-01-01

    Aim: To explore whether local blockade of T-box expressed in T cells (T-bet) expression in the 1ungs could lead to airway inflammation. Methods: Twenty-four rats were randomly divided into 4 groups: saline group, ovalbumin (OVA)-sensitized group, nonsense group, and the antisense group. The OVA-sensitized rats were sensitized and challenged with OVA, and the rats in the nonsense and antisense groups were subjected to an aerosol delivery of the nonsense and antisense oligonucleotides (AS-ODN)of T-bet(0.1%, w/v). The levels of interferon-γ(IFN-γ), interleukin-4(IL-4), and IL-5 in the bronchoalveolar lavage fluid (BALF) were detected by ELISA, and the mRNA and the protein expression of T-bet and GATA-3 genes were examined by in situ hybridization and Western blot analysis, respectively. Results: The expression of T-bet mRNA and protein in the lungs of the rats in the antisense group were inhibited effectively. The lungs of the rats in the antisense and OVA-sensitized groups showed eosinophil and lymphocyte inflammatory infiltration, and eosinophilia located predominantly around the airways. The number of GATA-3 mRNA-positive cells and the level of GAllA-3 protein in the 1ungs of the rats in the antisense and the OVA-sensitized groups significantly increased. The level of IL-4 and IL-5 in the BALF in the antisense and OVA-sensitized groups were elevated, but the level of IFN-γ decreased markedly. Conclusion: Antisense ODN-induced local blockade of T-bet expression leads to airway inflammation with a selective alteration in patterns of cytokine expression and recruitment of eosinophil cells similar to that in the OVA-sensitized

  12. Functional analysis of splicing mutations in the IDS gene and the use of antisense oligonucleotides to exploit an alternative therapy for MPS II.

    Matos, Liliana; Gonçalves, Vânia; Pinto, Eugénia; Laranjeira, Francisco; Prata, Maria João; Jordan, Peter; Desviat, Lourdes R; Pérez, Belén; Alves, Sandra

    2015-12-01

    Mucopolysaccharidosis II is a lysosomal storage disorder caused by mutations in the IDS gene, including exonic alterations associated with aberrant splicing. In the present work, cell-based splicing assays were performed to study the effects of two splicing mutations in exon 3 of IDS, i.e., c.241C>T and c.257C>T, whose presence activates a cryptic splice site in exon 3 and one in exon 8, i.e., c.1122C>T that despite being a synonymous mutation is responsible for the creation of a new splice site in exon 8 leading to a transcript shorter than usual. Mutant minigene analysis and overexpression assays revealed that SRSF2 and hnRNP E1 might be involved in the use and repression of the constitutive 3' splice site of exon 3 respectively. For the c.1122C>T the use of antisense therapy to correct the splicing defect was explored, but transfection of patient fibroblasts with antisense morpholino oligonucleotides (n=3) and a locked nucleic acid failed to abolish the abnormal transcript; indeed, it resulted in the appearance of yet another aberrant splicing product. Interestingly, the oligonucleotides transfection in control fibroblasts led to the appearance of the aberrant transcript observed in patients' cells after treatment, which shows that the oligonucleotides are masking an important cis-acting element for 5' splice site regulation of exon 8. These results highlight the importance of functional studies for understanding the pathogenic consequences of mis-splicing and highlight the difficulty in developing antisense therapies involving gene regions under complex splicing regulation. PMID:26407519

  13. Development of a Method for Profiling Protein Interactions with LNA-Modified Antisense Oligonucleotides Using Protein Microarrays.

    Kakiuchi-Kiyota, Satoko; Whiteley, Lawrence O; Ryan, Anne M; Mathialagan, Nagappan

    2016-04-01

    Development of locked nucleic acid (LNA) gapmers, antisense oligonucleotides used for efficient inhibition of target RNA expression, is limited by nontarget-mediated hepatotoxicity. Increased binding of hepatocellular proteins to toxic LNA gapmers may be one of the mechanisms contributing to LNA gapmer-induced hepatotoxicity in vivo. In the present study, we investigated the protein binding propensity of nontoxic sequence-1 (NTS-1), toxic sequence-2 (TS-2), and severely highly toxic sequence-3 (HTS-3) LNA gapmers using human protein microarrays. We previously demonstrated by the transcription profiling analysis of liver RNA isolated from mice that TS-2 and HTS-3 gapmers modulate different transcriptional pathways in mice leading to hepatotoxicity. Our protein array profiling demonstrated that a greater number of proteins, including ones associated with hepatotoxicity, hepatic system disorder, and cell functions, were bound by TS-2 and HTS-3 compared with NTS-1. However, the profiles of proteins bound by TS-2 and HTS-3 were similar and did not distinguish proteins contributing to severe in vivo toxicity. These results, together with the previous transcription profiling analysis, indicate that the combination of sequence-dependent transcription modulation and increased protein binding of toxic LNA gapmers contributes to hepatotoxicity. PMID:26643897

  14. The growth inhibition of human pancreatic cancer cells by lipofectin mediated IGF-1R antisense oligonucleotides

    Objective: To study the enhancement of the growth inhibition by irradiation to human pancreatic cancer cells (PC-3) transfected by lipofectin-mediated insulin-like growth factor-1 receptor (IGF-1R) antisense oligonucleotides (ASON) and its tumorigenecity in nude mice. Methods: The curves of the survived PC-3 cells after 60Co γ radiation in varied dose were drawn and the optimal radiation dose was selected. Two transfection ways were utilized, transfected by IGF-1R lipo-ASON combined with or without ionizing radiation. Cells growth inhibition was shown by methyl thiazolium tetrazolium (MTT). The mRNA expression of IGF-1R was examined by reverse transcription-polymerase chain reaction (RT-PCR). Flow cytometry was used to demonstrate apoptotic changes in both groups. After the transplanted tumors have grown in nude mice, lipo-ASON was injected in both groups, then the effects of inhibition were compared. Results: The inhibitory effect of lipo-ASON was injected in both groups, then the effects of inhibition were compared. Results: The inhibitory effect of lipo-ASON (86.3%), the apoptotic rate (53.06%) and the decreasing of IGF-1R mRNA (79.2%) in irradiation group was higher than non-irradiation group. Also, the differences were significant in tumor volume in irradiation group comparing to the control group (P<0.01). Conclusion: The ASON of IGF-1R can effectively inhibit the growth of tumor, and its inhibition can be enhanced by irradiation. (authors)

  15. Antisense oligonucleotide induced exon skipping and the dystrophin gene transcript: cocktails and chemistries

    Fletcher Sue

    2007-07-01

    Full Text Available Abstract Background Antisense oligonucleotides (AOs can interfere with exon recognition and intron removal during pre-mRNA processing, and induce excision of a targeted exon from the mature gene transcript. AOs have been used in vitro and in vivo to redirect dystrophin pre-mRNA processing in human and animal cells. Targeted exon skipping of selected exons in the dystrophin gene transcript can remove nonsense or frame-shifting mutations that would otherwise have lead to Duchenne Muscular Dystrophy, the most common childhood form of muscle wasting. Results Although many dystrophin exons can be excised using a single AO, several exons require two motifs to be masked for efficient or specific exon skipping. Some AOs were inactive when applied individually, yet pronounced exon excision was induced in transfected cells when the AOs were used in select combinations, clearly indicating synergistic rather than cumulative effects on splicing. The necessity for AO cocktails to induce efficient exon removal was observed with 2 different chemistries, 2'-O-methyl modified bases on a phosphorothioate backbone and phosphorodiamidate morpholino oligomers. Similarly, other trends in exon skipping, as a consequence of 2'-O-methyl AO action, such as removal of additional flanking exons or variations in exon skipping efficiency with overlapping AOs, were also seen when the corresponding sequences were prepared as phosphorodiamidate morpholino oligomers. Conclusion The combination of 2 AOs, directed at appropriate motifs in target exons was found to induce very efficient targeted exon skipping during processing of the dystrophin pre-mRNA. This combinatorial effect is clearly synergistic and is not influenced by the chemistry of the AOs used to induce exon excision. A hierarchy in exon skipping efficiency, observed with overlapping AOs composed of 2'-O-methyl modified bases, was also observed when these same sequences were evaluated as phosphorodiamidate morpholino

  16. The effect of in vitro exposure to antisense oligonucleotides on macrophage morphology and function

    Ann Brasey

    2011-11-01

    Full Text Available Antisense oligonucleotides (AON delivered via inhalation are in drug development for respiratory diseases. In rodents and monkeys, repeated exposure to high doses of inhaled phosphorothioate (PS AON can lead to microscopic changes in the lungs, including accumulation of alveolar macrophages in the lower airway that have a foamy appearance. The functional consequences that result from this morphological change are unclear as there is controversy whether the vacuoles/inclusion bodies reflect normal clearance of the inhaled AON or are early indicators of lung toxicity. The morphological and functional responses of macrophage to PS AON were characterized in vitro using the comparator drug amiodarone, as a known inducer of foamy macrophages. Morphological changes of increased vacuolization with the presence of lamellated structures were observed in macrophages in response to both amiodarone and AON treatment. Functional responses to the drugs clearly differed with amiodarone treatment leading to apoptosis of cells and cell death, release of proinflammatory mediators IL-1RA, MIP-1α and TNFα, decrease in IP-10, a cytokine shown to be involved in protection against pulmonary fibrosis and altered phagocytosis capacity of the cells. In contrast, AON in concentrations up to 30 μM, had no effect on cell viability or apoptosis, had minimal effects on pro-inflammatory cytokines, increased IP-10 levels and did not alter the phagocytic capacity of the cells. Exposure of macrophages to AON in vitro, led to morphological changes of increased vacuolization, but did not lead to functional consequences which were observed with another vacuolization-inducing drug, suggesting that the in vivo phenotypic changes observed following inhalation of AON may be consistent with a clearance mechanism and not an activation or impairment of macrophages.

  17. Defining the factors that contribute to on-target specificity of antisense oligonucleotides.

    Walt F Lima

    Full Text Available To better understand the factors that influence the activity and specificity of antisense oligonucleotides (ASOs, we designed a minigene encoding superoxide dismutase 1 (SOD-1 and cloned the minigene into vectors for T7 transcription of pre-mRNA and splicing in a nuclear extract or for stable integration in cells. We designed a series of ASOs that covered the entire mRNA and determined the binding affinities and activities of the ASOs in a cell-free system and in cells. The mRNA bound known RNA-binding proteins on predicted binding sites in the mRNA. The higher order structure of the mRNA had a significantly greater effect than the RNA-binding proteins on ASO binding affinities as the ASO activities in cells and in the cell-free systems were consistent. We identified several ASOs that exhibited off-target hybridization to the SOD-1 minigene mRNA in the cell-free system. Off-target hybridization occurred only at highly accessible unstructured sites in the mRNA and these interactions were inhibited by both the higher order structure of the mRNA and by RNA-binding proteins. The same off-target hybridization interactions were identified in cells that overexpress E. coli RNase H1. No off-target activity was observed for cells expressing only endogenous human RNase H1. Neither were these off-target heteroduplexes substrates for recombinant human RNase H1 under multiple-turnover kinetics suggesting that the endogenous enzyme functions under similar kinetic parameters in cells and in the cell-free system. These results provide a blueprint for design of more potent and more specific ASOs.

  18. Selective Neuromuscular Denervation in Taiwanese Severe SMA Mouse Can Be Reversed by Morpholino Antisense Oligonucleotides

    Lin, Te-Lin; Chen, Tai-Heng; Hsu, Ya-Yun; Cheng, Yu-Hua; Juang, Bi-Tzen; Jong, Yuh-Jyh

    2016-01-01

    Spinal muscular atrophy (SMA) is an autosomal recessive motor neuron disease caused by deficiency of the survival of motor neuron (SMN) protein, which leads to synaptic defects and spinal motor neuron death. Neuromuscular junction (NMJ) abnormalities have been found to be involved in SMA pathogenesis in the SMNΔ7 SMA mouse model. However, whether similar NMJ pathological findings present in another commonly used mouse model, the Taiwanese SMA mouse, has not been fully investigated. To examine the NMJs of the Taiwanese severe SMA mouse model (Smn-/-; SMN2tg/0), which is characterized by severe phenotype and death before postnatal day (P) 9, we investigated 25 axial and appendicular muscles from P1 to P9. We labelled the muscles with anti-neurofilament and anti-synaptophysin antibodies for nerve terminals and α-bungarotoxin for acetylcholine receptors (AChRs). We found that severe NMJ denervation (<50% fully innervated endplates) selectively occurred in the flexor digitorum brevis 2 and 3 (FDB-2/3) muscles from P5, and an increased percentage of fully denervated endplates correlated with SMA progression. Furthermore, synaptophysin signals were absent at the endplate compared to control littermate mice, suggesting that vesicle transport might only be affected at the end stage. Subsequently, we treated the Taiwanese severe SMA mice with morpholino (MO) antisense oligonucleotides (80 μg/g) via subcutaneous injection at P0. We found that MO significantly reversed the NMJ denervation in FDB-2/3 muscles and extended the survival of Taiwanese severe SMA mice. We conclude that early NMJ denervation in the FDB-2/3 muscles of Taiwanese severe SMA mice can be reversed by MO treatment. The FDB-2/3 muscles of Taiwanese severe SMA mice provide a very sensitive platform for assessing the effectiveness of drug treatments in SMA preclinical studies. PMID:27124114

  19. Translational Inhibition of CTX-M Extended Spectrum β-Lactamase in Clinical Strains of Escherichia coli by Synthetic Antisense Oligonucleotides Partially Restores Sensitivity to Cefotaxime.

    Readman, John B; Dickson, George; Coldham, Nick G

    2016-01-01

    Synthetic antisense oligomers are DNA mimics that can specifically inhibit gene expression at the translational level by ribosomal steric hindrance. They bind to their mRNA targets by Watson-Crick base pairing and are resistant to degradation by both nucleases and proteases. A 25-mer phosphorodiamidate morpholino oligomer (PMO) and a 13-mer polyamide (peptide) nucleic acid (PNA) were designed to target mRNA (positions -4 to +21, and -17 to -5, respectively) close to the translational initiation site of the extended-spectrum β-lactamase resistance genes of CTX-M group 1. These antisense oligonucleotides were found to inhibit β-lactamase activity by up to 96% in a cell-free translation-transcription coupled system using an expression vector carrying a bla CTX-M-15 gene cloned from a clinical isolate. Despite evidence for up-regulation of CTX-M gene expression, they were both found to significantly restore sensitivity to cefotaxime (CTX) in E. coli AS19, an atypical cell wall permeable mutant, in a dose dependant manner (0-40 nM). The PMO and PNA were covalently bound to the cell penetrating peptide (CPP; (KFF)3K) and both significantly (P < 0.05) increased sensitivity to CTX in a dose dependent manner (0-40 nM) in field and clinical isolates harboring CTX-M group 1 β-lactamases. Antisense oligonucleotides targeted to the translational initiation site and Shine-Dalgarno region of bla CTX-M-15 inhibited gene expression, and when conjugated to a cell penetrating delivery vehicle, partially restored antibiotic sensitivity to both field and clinical isolates. PMID:27047482

  20. Translational inhibition of CTX M extended spectrum β-lactamase in clinical strains of Escherichia coli by synthetic antisense oligonucleotides partially restores sensitivity to cefotaxime.

    John Benedict Readman

    2016-03-01

    Full Text Available Synthetic antisense oligomers are DNA mimics that can specifically inhibit gene expression at the translational level by ribosomal steric hindrance. They bind to their mRNA targets by Watson Crick base pairing and are resistant to degradation by both nucleases and proteases. A 25 mer phosphorodiamidate morpholino oligomer (PMO and a 13 mer polyamide (peptide nucleic acid (PNA were designed to target mRNA (positions -4 to +21, and –17 to –5 respectively close to the translational initiation site of the extended spectrum β lactamase resistance genes of CTX M group 1. These antisense oligonucleotides were found to inhibit β lactamase activity by up to 96% in a cell free translation transcription coupled system using an expression vector carrying a blaCTX-M-15 gene cloned from a clinical isolate. Despite evidence for up regulation of CTX-M gene expression, they were both found to significantly restore sensitivity to cefotaxime in E. coli AS19, an atypical cell wall permeable mutant, in a dose dependant manner (0 - 40 nM. The PMO and PNA were covalently bound to the cell penetrating peptide (KFF3K and both significantly (P<0.05 increased sensitivity to cefotaxime in a dose dependent manner (0 - 40 nM in field isolates harbouring CTX-M group 1 β-lactamases. Antisense oligonucleotides targeted to the translational initiation site and Shine Dalgarno region of blaCTX-M-15 inhibited gene expression, and when conjugated to a cell penetrating delivery vehicle, partially restored antibiotic sensitivity to both field and clinical isolates.

  1. Improved antisense oligonucleotide design to suppress aberrant SMN2 gene transcript processing: towards a treatment for spinal muscular atrophy.

    Chalermchai Mitrpant

    Full Text Available Spinal muscular atrophy (SMA is caused by loss of the Survival Motor Neuron 1 (SMN1 gene, resulting in reduced SMN protein. Humans possess the additional SMN2 gene (or genes that does produce low level of full length SMN, but cannot adequately compensate for loss of SMN1 due to aberrant splicing. The majority of SMN2 gene transcripts lack exon 7 and the resultant SMNΔ7 mRNA is translated into an unstable and non-functional protein. Splice intervention therapies to promote exon 7 retention and increase amounts of full-length SMN2 transcript offer great potential as a treatment for SMA patients. Several splice silencing motifs in SMN2 have been identified as potential targets for antisense oligonucleotide mediated splice modification. A strong splice silencer is located downstream of exon 7 in SMN2 intron 7. Antisense oligonucleotides targeting this motif promoted SMN2 exon 7 retention in the mature SMN2 transcripts, with increased SMN expression detected in SMA fibroblasts. We report here systematic optimisation of phosphorodiamidate morpholino oligonucleotides (PMO that promote exon 7 retention to levels that rescued the phenotype in a severe mouse model of SMA after intracerebroventricular delivery. Furthermore, the PMO gives the longest survival reported to date after a single dosing by ICV.

  2. Peptide nucleic acid (PNA) antisense effects in Escherichia coli

    Good, L; Nielsen, P E

    1999-01-01

    Antisense peptide nucleic acid (PNA) can be used to control cell growth, gene expression and growth phenotypes in the bacteria Escherichia coli. PNAs targeted to the RNA components of the ribosome can inhibit translation and cell growth, and PNAs targeted to mRNA can limit gene expression with gene...... and sequence specificity. In an E. coli cell extract, efficient inhibition is observed when using PNA concentrations in the nanomolar range, whereas micromolar concentrations are required for inhibition in growing cells. A mutant strain of E. coli that is more permeable to antibiotics also is more...... susceptible to antisense PNAs than the wild type. This chapter details methods for testing the antisense activities of PNA in E. coli. As an example of the specific antisense inhibition possible, we show the effects of an anti-beta-galactosidase PNA in comparison to control PNAs. With improvements in cell...

  3. Heat shock protein 70 antisense oligonucleotide inhibits cell growth and induces apoptosis in human gastric cancer cell line SGC-7901

    Zhi-Gang Zhao; Wen-Lu Shen

    2005-01-01

    AIM: Heat shock protein (HSP)70 is over-expressed in human gastric cancer and plays an important role in the progression of this cancer. We investigated the effects of antisense HSP70 oligomer on human gastric cancer cell line SGC-7901, and its potential role in gene therapy for this cancer.METHODS: Human gastric cancer cell line SGC-7901 was treated in vitro with various concentrations of antisense HSP70 oligonucleotides at different intervals. Growth inhibition was determined as percentage by trypan blue dye exclusion test. Extracted DNA was electrophoresed on agarose gel, and distribution of cell cycle and kinetics of apoptosis induction were analyzed by propidium iodide DNA incorporation using flow cytometry, which was also used to detect the effects of antisense oligomer pretreatment on the subsequent apoptosis induced by heat shock in SGC-7901 cells. Proteins were extracted for simultaneous measurement of HSP70 expression level by SDS-PAGE Western blotting.RESULTS: The number of viable cells decreased in a doseand time-dependent manner, and ladder-like patterns of DNA fragments were observed in SGC-7901 cells treated with antisense HSP70 oligomers at a concentration of 10 μmol/L for 48 h or 8 μmol/L for 72 h, which were consistent with inter-nucleosomal DNA fragmentation. Flow cytometric analysis showed a dose- and time-dependent increase in apoptotic rate by HSP70 antisense oligomers. This response was accompanied with a decrease in the percentage of cells in the G1 and S phases of the cell cycle, suggesting inhibition of cell proliferation. In addition, flow cytometry also showed that pretreatment of SGC-7901 cells with HSP70 antisense oligomers enhanced the subsequent apoptosis induced by heat shock treatment. Western blotting demonstrated that HSP70 antisense oligomers inhibited HSP70 expression, which preceded apoptosis, and HSP70 was undetectable at the concentration of 10 μmol/L for 48 h or 8 μmol/L for 72 h.CONCLUSION: Antisense HSP70 oligomers

  4. Presymptomatic Treatment with Acetylcholinesterase Antisense Oligonucleotides Prolongs Survival in ALS (G93A-SOD1) Mice

    Gotkine Marc; Rozenstein Leah; Einstein Ofira; Abramsky Oded; Argov Zohar; Rosenmann Hanna

    2013-01-01

    Objective. Previous research suggests that acetylcholinesterase (AChE) may be involved in ALS pathogenesis. AChE enzyme inhibitors can upregulate AChE transcription which in certain contexts can have deleterious (noncatalytic) effects, making them theoretically harmful in ALS, whilst AChE antisense-oligonucleotides (mEN101), which downregulate AChE may be beneficial. Our aim was to investigate whether downregulation of AChE using mEN101 is beneficial in an ALS mouse model. Methods. ALS (G93A-...

  5. Central and Peripheral Administration of Antisense Oligonucleotide Targeting Amyloid Precursor Protein Improves Learning and Memory and Reduces Neuroinflammatory Cytokines in Tg2576 (APPswe) Mice

    Farr, Susan A.; Erickson, Michelle A.; Niehoff, Michael L; Banks, William A; Morley, John E.

    2014-01-01

    Alzheimer’s disease (AD) is a progressive neurodegenerative disease. The World Health Organization estimates that there are currently 18 million people worldwide living with AD and that number is expected to double by early 2025. Currently, there are no therapies to stop or reverse the symptoms of AD. We have developed an antisense oligonucleotide (OL-1) against the amyloid betaprotein precursor (AβPP) that can decrease AβPP expression and amyloid beta protein (Aβ) production. This antisense ...

  6. Scavenger Receptor-Mediated Delivery of Antisense Mini-Exon Phosphorothioate Oligonucleotide to Leishmania-Infected Macrophages: SELECTIVE AND EFFICIENT ELIMINATION OF THE PARASITE

    Chaudhuri, Gautam

    1997-01-01

    Targeted delivery of a 17-mer antisense phosphorothioate oligodeoxyribonucleotide, complementary to the common 5′-end of every mRNA of the parasite cells, to the phagolysosomes of cultured murine macrophages infected with Leishmania mexicana amazonensis selectively and efficiently eliminated the parasite cells without causing any detectable harm to the host cells. The antisense mini-exon oligonucleotide (ASM) was encapsulated into liposomes coated with maleylated bovine serum albumin (MBSA), ...

  7. Combination of vascular endothelial growth factor antisense oligonucleotide therapy and radiotherapy increases the curative effects against maxillofacial VX2 tumors in rabbits

    Purpose: To study the effects of combination of vascular endothelial growth factor (VEGF) antisense oligonucleotide therapy and radiotherapy on maxillofacial VX2 tumors in rabbits. Methods: We used 24 New Zealand white rabbits as a model to induce maxillofacial VX2 tumor. The rabbits were randomly divided into the following 4 groups: radiotherapy group (group A), treated with 16 Gy of radiotherapy; VEGF antisense oligonucleotide treatment group (group B), treated with an injection of 150 μg of VEGF antisense oligonucleotide into the local tumor; VEGF antisense oligonucleotide combined with radiotherapy group (group C), treated with an injection of 150 μg of VEGF antisense oligonucleotide into the local tumor immediately after 16 Gy of radiotherapy; and control group (group D), treated with an injection of 300 μl 5% aqueous glucose solution into the local tumor. On days 3 and 14 after treatment, dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) was performed to calculate maximal enhancement ratio (MER), slope of enhancement (SLE), and tumor volume change. Rabbits were killed on day 14 to obtain samples for pathological examination and immunohistochemical staining for VEGF. Results: In group C, tumor volume was significantly reduced on day 14 after treatment, and the difference was statistically different as compared to that before treatment, on day 3 after treatment and other groups (P < 0.01). Values of both MER and SLE after treatment were significantly lower than the values before treatment (P < 0.05). Pathological specimen revealed tumor cell edema, bleeding, necrosis, vascular wall thickening and occlusion, and decreased VEGF expression. The immunohistochemical score (IHS) of group C was significantly different from groups A and D respectively (P < 0.05). Conclusion: Injecting the tumor with VEGF antisense oligonucleotide immediately after radiotherapy can enhance the curative effect on rabbit maxillofacial VX2 tumor, and DCE-MRI can serve as a

  8. Cooperative inhibitory effects of antisense oligonucleotide of cell adhesion molecules and cimetidine on cancer cell adhesion

    Nan-Hong Tang; Yan-Ling Chen; Xiao-Qian Wang; Xiu-Jin Li; Feng-Zhi Yin; Xiao-Zhong Wang

    2004-01-01

    AIM: To explore the cooperative effects of antisense oligonucleotide (ASON) of cell adhesion molecules and cimetidine on the expression of E-selectin and ICAM-1 in endothelial cells and their adhesion to tumor cells.METHODS: After treatment of endothelial cells with ASON and/or cimetidine and induction with TNF-α, the protein and mRNA changes of E-selectin and ICAM-1 in endothelial cells were examined by flow cytometry and RT-PCR,respectively. The adhesion rates of endothelial cells to tumor cells were measured by cell adhesion experiment.RESULTS: In comparison with TNF-α inducing group, lipoASON and lipo-ASON/cimetidine could significantly decrease the protein and mRNA levels of E-selectin and ICAM-1 in endothelial cells, and lipo-ASON/cimetidine had most significant inhibitory effect on E-selectin expression (from 36.37±1.56% to 14.23±1.07%, P<0.001). Meanwhile,cimetidine alone could inhibit the expression of E-selectin (36.37±1.56% vs 27.2±1.31%, P<0.001), but not ICAM-1 (69.34±2.50% vs68.07±2.10%,P>O.05)and the two kinds of mRNA, either. Compared with TNF-αα inducing group, the rate of adhesion was markedly decreased in lipo-E-selectin ASON and lipo-E-selectin ASON/cimetidine treated groups(P<0.05),and Jipo-E-selectin ASON/cimetidine worked better than lipo-E-selectin ASON alone except for HepG2/ECV304 group(P<0.05). However, the decrease of adhesion was not significant in lipo-ICAM-1 ASON and lipo-ICAM-1 ASON/cimetidine treated groups except for HepG2/ECV304 group (P >0.05).CONCLUSION: These data demonstrate that ASON in combination with cimetidine in vitro can significantly reduce the adhesion between endothelial cells and hepatic or colorectal cancer cells, which is stronger than ASON or cimetidine alone. This study provides some useful proofs for gene therapy of antiadhesion.

  9. Sterilization of sterlet Acipenser ruthenus by using knockdown agent, antisense morpholino oligonucleotide, against dead end gene.

    Linhartová, Zuzana; Saito, Taiju; Kašpar, Vojtěch; Rodina, Marek; Prášková, Eva; Hagihara, Seishi; Pšenička, Martin

    2015-10-15

    Sturgeons (chondrostean, acipenseridae) are ancient fish species, widely known for their caviar. Nowadays, most of them are critically endangered. The sterlet (Acipenser ruthenus) is a common Eurasian sturgeon species with a small body size and the fastest reproductive cycle among sturgeons. Such species can be used as a host for surrogate production; application is of value for recovery of critically endangered and huge sturgeon species with an extremely long reproductive cycle. One prerequisite for production of the donor's gametes only is to have a sterile host. Commonly used sterilization techniques in fishes such as triploidization or hybridization do not guarantee sterility in sturgeon. Alternatively, sterilization can be achieved by using a temporary germ cell exclusion-specific gene by a knockdown agent, the antisense morpholino oligonucleotide (MO). The targeted gene for the MO is the dead end gene (dnd) which is a vertebrate-specific gene encoding a RNA-binding protein which is crucial for migration and survival of primordial germ cells (PGCs). For this purpose, a dnd homologue of Russian sturgeon (Agdnd), resulting in the same sequence in the start codon region with isolated fragments of sterlet dnd (Ardnd), was used. Reverse transcription polymerase chain reaction confirmed tissue-specific expression of Ardnd only in the gonads of both sexes. Dnd-MO for depletion of PGCs together with fluorescein isothiocyanate (FITC)-biotin-dextran for PGCs labeling was injected into the vegetal region of one- to four-cell-stage sterlet embryos. In the control groups, only FITC was injected to validate the injection method and labeling of PGCs. After optimization of MO concentration together with volume injection, 250-μM MO was applied for sterilization of sturgeon embryos. Primordial germ cells were detected under a fluorescent stereomicroscope in the genital ridge of the FITC-labeled control group only, whereas no PGCs were present in the body cavities of morphants

  10. Antisense oligonucleotide targeting at the initiator of hTERT arrests growth of hepatoma cells

    Su-Xia Liu; Wen-Sheng Sun; Ying-Lin Cao; Chun-Hong Ma; Li-Hui Han; Li-Ning Zhang; Zhen-Guang Wang; Fa-Liang Zhu

    2004-01-01

    AIM: To evaluate the inhibitory effect of antisense phosphorothioate oligonucleotide (asON) complementary to the initiator of human telomerase catalytic subunit (hTERT)on the growth of hepatoma cells.METHODS: The as-hTERT was synthesized by using a DNA synthesizer. HepG2.2.15 cells were treated with ashTERT at the concentration of 10 μmol/L. After 72 h, these cells were obtained for detecting growth inhibition,telomerase activity using the methods of MTT, TRAP-PCR-ELISA, respectively. BALB/c(nu/nu) mice were injected HepG2.2.15 cells and a human-nude mice model was obtained. There were three groups for anti-tumor activity study. Once tumors were established, these animals in the first group were administered as-hTERT and saline.Apoptosis of tumor cells was detected by FCM. In the 2nd group, the animals were injected HepG2.2.15 cells together with as-hTERT. In the third group, the animals were given as-hTERT 24 hours postinjection of HepG2.2.15 cells. The anti-HBV effects were assayed with ELISA ih vitro and in vivo.RESULTS: Growth inhibition was observed in cells treated with as-hTERT ih vitro. A significant different in the value of A570-A630 was found between cells treated with as-hTERT and control (P<0.01) by MTT method. The telomerase activity of tumor cells treated with as-hTERT was reduced,the value of A450 nm was 0.42 compared to control (1,49)with TRAP-PCR-ELISA. The peak of apoptosis in tumor cells given as-hTERT was 21. 12%, but not seen in saline-treated control. A prolonged period of carcinogenesis was observed in the second and third group animals. There was inhibitory effect on the expression of HBsAg and HBeAg ih vivo and in vitro.CONCLUSION: As-hTERT has an anti-tumor activity, which may be useful for gene therapy of tumors.

  11. Down-regulation of Survivin by Antisense Oligonucleotides Increases Apoptosis, Inhibits Cytokinesis and Anchorage-Independent Growth

    Jun Chen

    2000-05-01

    Full Text Available Survivin, a member of the inhibitor of apoptosis protein (IAP family, is detected in most common human cancers but not in adjacent normal cells. Previous studies suggest that survivin associates with the mitotic spindle and directly inhibits caspase activity. To further investigate the function of survivin, we used a survivin antisense (AS oligonucleotide to downregulate survivin expression in normal and cancer cells. We found that inhibition of survivin expression increased apoptosis and polyploidy while decreasing colony formation in soft agar. Immunohistochemistry showed that cells without survivin can initiate the cleavage furrow and contractile ring, but cannot complete cytokinesis, thus resulting in multinucleated cells. These findings indicate that survivin plays important roles in a late stage of cytokinesis, as well as in apoptosis.

  12. Effects of Antisense Oligonucleotides against C-Reactive Protein on the Development of Atherosclerosis in WHHL Rabbits

    Qi Yu

    2014-01-01

    Full Text Available Increased plasma levels of C-reactive protein (CRP are closely associated with cardiovascular diseases, but whether CRP is directly involved in the pathogenesis of atherosclerosis is still under debate. Many controversial and contradictory results using transgenic mice and rabbits have been published but it is also unclear whether CRP lowering can be used for the treatment of atherosclerosis. In the current study, we examined the effects of the rabbit CRP antisense oligonucleotides (ASO on the development of atherosclerosis in WHHL rabbits. CRP ASO treatment led to a significant reduction of plasma CRP levels; however, both aortic and coronary atherosclerotic lesions were not significantly changed compared to those of control WHHL rabbits. These results suggest that inhibition of plasma CRP does not affect the development of atherosclerosis in WHHL rabbits.

  13. Novel Cationic Carotenoid Lipids as Delivery Vectors of Antisense Oligonucleotides for Exon Skipping in Duchenne Muscular Dystrophy

    Vassilia Partali

    2012-01-01

    Full Text Available Duchenne Muscular Dystrophy (DMD is a common, inherited, incurable, fatal muscle wasting disease caused by deletions that disrupt the reading frame of the DMD gene such that no functional dystrophin protein is produced. Antisense oligonucleotide (AO-directed exon skipping restores the reading frame of the DMD gene, and truncated, yet functional dystrophin protein is expressed. The aim of this study was to assess the efficiency of two novel rigid, cationic carotenoid lipids, C30-20 and C20-20, in the delivery of a phosphorodiamidate morpholino (PMO AO, specifically designed for the targeted skipping of exon 45 of DMD mRNA in normal human skeletal muscle primary cells (hSkMCs. The cationic carotenoid lipid/PMO-AO lipoplexes yielded significant exon 45 skipping relative to a known commercial lipid, 1,2-dimyristoyl-sn-glycero-3-ethylphosphocholine (EPC.

  14. Formulation and drug-content assay of microencapsulated antisense oligonucleotide to NF-κB using ATR-FTIR

    Antisense oligonucleotide to NF-κB sequence: 5′-GGA AAC ACA TCC TCC ATG-3′, was microencapsulated in an albumin matrix by the method of spray dryingTM. Spectral analysis was performed on varying drug loading formulations of both drugs by mid-IR attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR). An out of plane O–H bending vibration at 948 cm−1, unique to both the native and microencapsulated drugs was identified. The calculated peak areas corresponded to the drug loadings in the microsphere formulations. A standard curve could then be used to determine the drug content of an unknown microsphere formulation. Accuracy and precision were determined to be comparable to other analytical techniques such as HPLC. (paper)

  15. Formulation and drug-content assay of microencapsulated antisense oligonucleotide to NF-κB using ATR-FTIR

    Siwale, Rodney; Meadows, Fred; Mody, Vicky V.; Shah, Samit

    2013-09-01

    Antisense oligonucleotide to NF-κB sequence: 5‧-GGA AAC ACA TCC TCC ATG-3‧, was microencapsulated in an albumin matrix by the method of spray dryingTM. Spectral analysis was performed on varying drug loading formulations of both drugs by mid-IR attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR). An out of plane O-H bending vibration at 948 cm-1, unique to both the native and microencapsulated drugs was identified. The calculated peak areas corresponded to the drug loadings in the microsphere formulations. A standard curve could then be used to determine the drug content of an unknown microsphere formulation. Accuracy and precision were determined to be comparable to other analytical techniques such as HPLC.

  16. Mismatched single stranded antisense oligonucleotides can induce efficient dystrophin splice switching

    Kole Ryszard

    2011-10-01

    Full Text Available Abstract Background Antisense oligomer induced exon skipping aims to reduce the severity of Duchenne muscular dystrophy by redirecting splicing during pre-RNA processing such that the causative mutation is by-passed and a shorter but partially functional Becker muscular dystrophy-like dystrophin isoform is produced. Normal exons are generally targeted to restore the dystrophin reading frame however, an appreciable subset of dystrophin mutations are intra-exonic and therefore have the potential to compromise oligomer efficiency, necessitating personalised oligomer design for some patients. Although antisense oligomers are easily personalised, it remains unclear whether all patient polymorphisms within antisense oligomer target sequences will require the costly process of producing and validating patient specific compounds. Methods Here we report preclinical testing of a panel of splice switching antisense oligomers, designed to excise exon 25 from the dystrophin transcript, in normal and dystrophic patient cells. These patient cells harbour a single base insertion in exon 25 that lies within the target sequence of an oligomer shown to be effective at removing exon 25. Results It was anticipated that such a mutation would compromise oligomer binding and efficiency. However, we show that, despite the mismatch an oligomer, designed and optimised to excise exon 25 from the normal dystrophin mRNA, removes the mutated exon 25 more efficiently than the mutation-specific oligomer. Conclusion This raises the possibility that mismatched AOs could still be therapeutically applicable in some cases, negating the necessity to produce patient-specific compounds.

  17. Suppression of intracranial glioma tumorigenesis with vascular endothelial growth factor antisense oligonucleotide in rats

    李维方; 张光霁; 朱诚; 金由辛; 卢亦成

    2003-01-01

    Objective: To observe the inhibition of intracranial glioma tumorigenesis by vascular endothelial growth factor (VEGF) antisense oligodeoxynucleotide (ODN) in rats. Methods: Totally 20 μl Hank's liquid containing 1×106 C6 glioma cells was seeded into rat right caudate putamen in high-flow microinfusion with stereotactic technique. VEGF antisense ODN was simultaneously used with glioma cell. Each rat of the treated groupⅠ and the treated group Ⅱ was treated with 1 000 μmol/L VEGF antisense ODN. Each rat of the treated group Ⅲ and the treated group Ⅳ was treated with 2 000 μmol/L VEGF antisense ODN. The experimental periods of the treated group Ⅰ, the treated group Ⅲ and the control group Ⅰ were 2 weeks, those of the treated group Ⅱ, the treated group Ⅳ and the control group Ⅱ were 3 weeks. Before sacrifice, MRI was performed on each rat. Tumor magnitude and pathologic examination were detected after samples were dissected. Results: The survival state of all treated rats was better, and that of the control rats was in severe danger. The tumor volumes of the treated group Ⅰ and the treated group Ⅱ were remarkably lessened. Tumor tissue could not be found macroscopically in the brain samples of the treated group Ⅲ and the treated group Ⅳ, but tumor nest could be found with microscopy. Tumors of the treated groupⅠand the treated group Ⅱ had weak expressions of VEGF mRNA and VEGF, while normal brains and the samples of the treated group Ⅲ and the treated group Ⅳ had negative expressions, but tumors of the control groups had strong expressions. Conclusion: VEGF antisense ODN used early in situ can suppress angiogenesis and growth of rat intracranial glioma to retard tumorigenesis.

  18. Antisense Oligonucleotides Targeting Parasite Inositol 1,4,5-Trisphosphate Receptor Inhibits Mammalian Host Cell Invasion by Trypanosoma cruzi

    Hashimoto, Muneaki; Nara, Takeshi; Hirawake, Hiroko; Morales, Jorge; Enomoto, Masahiro; Mikoshiba, Katsuhiko

    2014-02-01

    Chagas disease is caused by an intracellular parasitic protist, Trypanosoma cruzi. As there are no highly effective drugs against this agent that also demonstrate low toxicity, there is an urgent need for development of new drugs to treat Chagas disease. We have previously demonstrated that the parasite inositol 1,4,5-trisphosphate receptor (TcIP3R) is crucial for invasion of the mammalian host cell by T. cruzi. Here, we report that TcIP3R is a short-lived protein and that its expression is significantly suppressed in trypomastigotes. Treatment of trypomastigotes, an infective stage of T. cruzi, with antisense oligonucleotides specific to TcIP3R deceased TcIP3R protein levels and impaired trypomastigote invasion of host cells. Due to the resulting instability and very low expression level of TcIP3R in trypomastigotes indicates that TcIP3R is a promising target for antisense therapy in Chagas disease.

  19. Expression of heparanase mRNA in anti-sense oligonucleotide-transfected human esophageal cancer EC9706 cells

    Kui-Sheng Chen; Lan Zhang; Lin Tang; Yun-Han Zhang; Dong-Ling Gao; Liang Yan; Lei Zhang

    2005-01-01

    AIM: To investigate the effects of anti-sense oligonucleotides (ASODNs) on mRNA expression of heparanase in human esophageal cancer EC9706 cells.METHODS: One non-sense oligonucleotide (N-ODN) and five ASODNs against different heparanase mRNA sites were transfected into EC9706 cells, then the expression of heparanase mRNA in EC9706 cells was studied byin situ hybridization.RESULTS: The expression of heparanase mRNA could be inhibited by ASODNs.There was no significant difference among five ASODNs (P>0.05), but there was a significant difference between ASODNs and N-ODN or non-transfected group (ASODN1: 2.25±0.25, ASODN2: 2.21±0.23, ASODN3:2.23±0.23, ASODN4:2.25±0.24 vs N-ODN: 3.47±2.80 or non- transfected group: 3.51±2.93 respectively, P<0.05).CONCLUSION: The expression of heparanase mRNA in EC9706 cells can be inhibited by ASODNs in vivo, and heparanase ASODNs can inhibit metastasis of esophageal squamous cell carcinoma or other tumors by inhibiting the expression of heparanase.

  20. Effective exon skipping and dystrophin restoration by 2'-o-methoxyethyl antisense oligonucleotide in dystrophin-deficient mice.

    Lu Yang

    Full Text Available Antisense oligonucleotide (AO-mediated exon-skipping therapy is one of the most promising therapeutic strategies for Duchenne Muscular Dystrophy (DMD and several AO chemistries have been rigorously investigated. In this report, we focused on the effect of 2'-O-methoxyethyl oligonucleotides (MOE on exon skipping in cultured mdx myoblasts and mice. Efficient dose-dependent skipping of targeted exon 23 was achieved in myoblasts with MOE AOs of different lengths and backbone chemistries. Furthermore, we established that 25-mer MOE phosphorothioate (PS AOs provided the greatest exon-skipping efficacy. When compared with 2'O methyl phosphorothioate (2'OmePS AOs, 25-mer MOE (PS AOs also showed higher exon-skipping activity in vitro and in mdx mice after intramuscular injections. Characterization of uptake in vitro corroborated with exon-skipping results, suggesting that increased uptake of 25-mer MOE PS AOs might partly contribute to the difference in exon-skipping activity observed in vitro and in mdx mice. Our findings demonstrate the substantial potential for MOE PS AOs as an alternative option for the treatment of DMD.

  1. High-content imaging analysis of the knockdown effects of validated siRNAs and antisense oligonucleotides.

    Low, Jonathan; Shuguang Huang; Dowless, Michele; Blosser, Wayne; Vincent, Thomas; Davis, Scott; Hodson, Jeff; Koller, Erich; Marcusson, Eric; Blanchard, Kerry; Stancato, Louis

    2007-09-01

    High-content imaging (HCI) provides researchers with a powerful tool for understanding cellular processes. Although phenotypic analysis generated through HCI is a potent technique to determine the overall cellular effects of a given treatment, it frequently produces complex data sets requiring extensive interpretation. The authors developed statistical analyses to decrease the time spent to determine the outcome of each HCI assay and to better understand complex phenotypic changes. To test these tools, the authors performed a comparison experiment between 2 types of oligonucleotide-mediated gene silencing (OMGS), antisense oligonucleotides (ASOs), and short, double-stranded RNAs (siRNAs). Although similar in chemical structure, these 2 methods differ in cellular mechanism of action and off-target effects. Using a library of 50 validated ASOs and siRNAs to the same targets, the authors characterized the differential effects of these 2 technologies using a HeLa cell G2-M cell cycle assay. Although knockdown of a variety of targets by ASOs or siRNAs affected the cell cycle profile, few of those targets were affected by both ASOs and siRNAs. Distribution analysis of population changes induced through target knockdown led to the identification of targets that, when inhibited, could affect the G2-M transition in the cell cycle in a statistically significant manner. The distinctly different mechanisms of action of these 2 forms of gene silencing may help define the use of these treatments in both clinical and research environments. PMID:17517903

  2. Oblimersen: Augmerosen, BCL-2 antisense oligonucleotide - Genta, G 3139, GC 3139, oblimersen sodium.

    2007-01-01

    Oblimersen is an antisense oligonucleotide developed by Genta for systemic use as an injection. It comprises a phosphorothioate backbone linking 18 modified DNA bases. Oblimersen targets the first six codons of Bcl-2 mRNA to form a DNA/RNA complex. The duplex is subsequently recognised as a foreign message and is cleaved enzymatically, thereby destroying the Bcl-2 message. The Bcl-2 protein, which is a potent inhibitor of apoptosis, is overexpressed in many cancers, including follicular lymphomas, breast, colon and prostate cancers, and intermediate-/high-grade lymphomas. By reducing the amount of Bcl-2 protein in cancer cells, oblimersen may enhance the effectiveness of conventional anticancer treatments. Genta has reported results from randomised phase III trials of oblimersen in four different indications: malignant melanoma, chronic lymphocytic leukaemia (CLL), multiple myeloma and acute myleoid leukaemia (AML). A negative opinion has been issued for the company's MAA for the product in the treatment of malignant melanoma in the EU; the EMEA has indicated an additional confirmatory trial is needed in this indication for approval. An NDA for CLL was deemed non-approvable by the US FDA; the company is appealing this decision. The phase III trials in multiple myeloma and AML did not meet their primary endpoints. Phase I and II trials are also underway or have been completed for a range of other cancer types. Genta and sanofi-aventis (formerly Aventis) entered into a collaboration agreement in 2002; however, this agreement was terminated by sanofi-aventis in May 2005. Genta became solely responsible for all costs relating to oblimersen at this time. Genta expanded its Cooperative Research and Development Agreement (CRADA) with the National Cancer Institute in November 2001. The expanded collaboration was to investigate the use of oblimersen in combination with standard anticancer therapy in a broad range of cancers. This expansion occurred following the Gensynergy

  3. Development of Multiexon Skipping Antisense Oligonucleotide Therapy for Duchenne Muscular Dystrophy

    Yoshitsugu Aoki; Toshifumi Yokota; Wood, Matthew J. A.

    2013-01-01

    Duchenne muscular dystrophy (DMD) is an incurable, X-linked progressive muscle degenerative disorder that results from the absence of dystrophin protein and leads to premature death in affected individuals due to respiratory and/or cardiac failure typically by age of 30. Very recently the exciting prospect of an effective oligonucleotide therapy has emerged which restores dystrophin protein expression to affected tissues in DMD patients with highly promising data from a series of clinical tri...

  4. The cellular uptake of antisense oligonucleotid of E6 mRNA into cervical cancer cells by DOPE-modified hydroxyapatite nanoparticles

    Negin Saffarzadeh; Seyed Mehdi Kalantar; Ali Jebali; Seyed Hossein Hekmatimoghaddam; Mohammad Hassan Sheikhha; Ehsan Farashahi

    2014-01-01

    Objective(s): Although several chemical and physical methods for gene delivery have been introduced, their cytotoxicity, non-specific immune responses and the lack of biodegradability remain the main issues. In this study, hydroxyapatite nanoparticles (NPs) and 1,2-dioleoyl-sn-glycero-3-phosphoethanol​amine (DOPE)-modified hydroxyapatite NPs was coated with antisense oligonucleotide of E6 mRNA, and their uptakes into the cervical cancer cell line were evaluated. Materials and Methods: Calcium...

  5. Antitumor activity of antisense oligonucleotide p45Skp2 in soft palate carcinoma cell squamous in vitro

    Supriatno Supriatno

    2013-03-01

    Full Text Available Background: Human soft palate cancers are characterized by a high degree of local invasion and metastasis to the regional lymph nodes. Treatment options for this cancer are limited. However, a new strategy for refractory cancer, gene therapy is watched with keen interest. p45Skp2 gene as a tumor promoter gene is one of target of the oral cancer therapy. To inhibit the activity of p45Skp2 gene is carried-out the genetic engineering via antisense technique. Purpose: To examine the antitumor activity of p45Skp2 antisense (p45Skp2 AS gene therapy in human soft palate [Hamakawa-Inoue (HI] cancer cells. Methods: Pure laboratory experimental study with post test only control group design was conducted as a research design. To investigate the apoptosis induction of p45Skp2 AStransfected cell was evaluated by colorimetric caspase-3 assay and Flow cytometry. Furthermore, to detect the suppression of in vitro HI cell invasion and cell growth of p45Skp2 AS-treatment cell was examined by Boyden chamber kit and MTT assay, respectively. Results: The cell number of p45Skp2 AS-treated HI cell was significant decreased when compared with that of p45Skp2 sense (p45Skp2 S cells (p<0.05. p45Skp2 AS-treated cell induced apoptosis characterized by an increase in the early and late apoptosis, and activation of caspase-3 (p<0.05. Therefore, suppression of HI cell invasion and cell growth were markedly increased by p45Skp2 AS treatment (p<0.05. Conclusion: Antisense oligonucleotide p45Skp2 has a high antitumor activity in human soft palate cancer cell, targeting this molecule could represent a promising new therapeutics approach for this type of cancer.Latar belakang: Kanker palatum lunak mempunyai karakteristik invasi dan metastasis ke limfonodi regional yang tinggi. Pilihan perawatan kanker tersebut masih sangat terbatas. Walaupun demikian, strategi baru untuk penanganan kanker yaitu terapi gen menjadi pilihan utama. Gen p45Skp2 sebagai gen pemacu tumor merupakan salah

  6. Reliable Assessment and Quantification of the Fluorescence-Labeled Antisense Oligonucleotides In Vivo

    Maria Chiara Munisso

    2014-01-01

    Full Text Available The availability of fluorescent dyes and the advances in the optical systems for in vivo imaging have stimulated an increasing interest in developing new methodologies to study and quantify the biodistribution of labeled agents. However, despite these great achievements, we are facing significant challenges in determining if the observed fluorescence does correspond to the quantity of the dye in the tissues. In fact, although the far-red and near-infrared lights can propagate through several centimetres of tissue, they diffuse within a few millimetres as consequence of the elastic scattering of photons. In addition, when dye-labeled oligonucleotides form stable complex with cationic carriers, a large change in the fluorescence intensity of the dye is observed. Therefore, the measured fluorescence intensity is altered by the tissue heterogeneity and by the fluctuation of dye intensity. Hence, in this study a quantification strategy for fluorescence-labeled oligonucleotides was developed to solve these disadvantageous effects. Our results proved that upon efficient homogenization and dilution with chaotropic agents, such as guanidinium thiocyanate, it is possible to achieve a complete fluorescence intensity recovery. Furthermore, we demonstrated that this method has the advantage of good sensitivity and reproducibility, as well as easy handling of the tissue samples.

  7. Hepatotoxicity of high affinity gapmer antisense oligonucleotides is mediated by RNase H1 dependent promiscuous reduction of very long pre-mRNA transcripts.

    Burel, Sebastien A; Hart, Christopher E; Cauntay, Patrick; Hsiao, Jill; Machemer, Todd; Katz, Melanie; Watt, Andy; Bui, Huynh-Hoa; Younis, Husam; Sabripour, Mahyar; Freier, Susan M; Hung, Gene; Dan, Amy; Prakash, T P; Seth, Punit P; Swayze, Eric E; Bennett, C Frank; Crooke, Stanley T; Henry, Scott P

    2016-03-18

    High affinity antisense oligonucleotides (ASOs) containing bicylic modifications (BNA) such as locked nucleic acid (LNA) designed to induce target RNA cleavage have been shown to have enhanced potency along with a higher propensity to cause hepatotoxicity. In order to understand the mechanism of this hepatotoxicity, transcriptional profiles were collected from the livers of mice treated with a panel of highly efficacious hepatotoxic or non-hepatotoxic LNA ASOs. We observed highly selective transcript knockdown in mice treated with non-hepatotoxic LNA ASOs, while the levels of many unintended transcripts were reduced in mice treated with hepatotoxic LNA ASOs. This transcriptional signature was concurrent with on-target RNA reduction and preceded transaminitis. Remarkably, the mRNA transcripts commonly reduced by toxic LNA ASOs were generally not strongly associated with any particular biological process, cellular component or functional group. However, they tended to have much longer pre-mRNA transcripts. We also demonstrate that the off-target RNA knockdown and hepatotoxicity is attenuated by RNase H1 knockdown, and that this effect can be generalized to high affinity modifications beyond LNA. This suggests that for a certain set of ASOs containing high affinity modifications such as LNA, hepatotoxicity can occur as a result of unintended off-target RNase H1 dependent RNA degradation. PMID:26553810

  8. Histopathological Defects in Intestine in Severe Spinal Muscular Atrophy Mice Are Improved by Systemic Antisense Oligonucleotide Treatment.

    Palittiya Sintusek

    Full Text Available Gastrointestinal (GI defects, including gastroesophageal reflux, constipation and delayed gastric emptying, are common in patients with spinal muscular atrophy (SMA. Similar GI dysmotility has been identified in mouse models with survival of motor neuron (SMN protein deficiency. We previously described vascular defects in skeletal muscle and spinal cord of SMA mice and we hypothesized that similar defects could be involved in the GI pathology observed in these mice. We therefore investigated the gross anatomical structure, enteric vasculature and neurons in the small intestine in a severe mouse model of SMA. We also assessed the therapeutic response of GI histopathology to systemic administration of morpholino antisense oligonucleotide (AON designed to increase SMN protein expression. Significant anatomical and histopathological abnormalities, with striking reduction of vascular density, overabundance of enteric neurons and increased macrophage infiltration, were detected in the small intestine in SMA mice. After systemic AON treatment in neonatal mice, all the abnormalities observed were significantly restored to near-normal levels. We conclude that the observed GI histopathological phenotypes and functional defects observed in these SMA mice are strongly linked to SMN deficiency which can be rescued by systemic administration of AON. This study on the histopathological changes in the gastrointestinal system in severe SMA mice provides further indication of the complex role that SMN plays in multiple tissues and suggests that at least in SMA mice restoration of SMN production in peripheral tissues is essential for optimal outcome.

  9. RNA cleavage products generated by antisense oligonucleotides and siRNAs are processed by the RNA surveillance machinery.

    Lima, Walt F; De Hoyos, Cheryl L; Liang, Xue-Hai; Crooke, Stanley T

    2016-04-20

    DNA-based antisense oligonucleotides (ASOs) elicit cleavage of the targeted RNA by the endoribonuclease RNase H1, whereas siRNAs mediate cleavage through the RNAi pathway. To determine the fates of the cleaved RNA in cells, we lowered the levels of the factors involved in RNA surveillance prior to treating cells with ASOs or siRNA and analyzed cleavage products by RACE. The cytoplasmic 5' to 3' exoribonuclease XRN1 was responsible for the degradation of the downstream cleavage products generated by ASOs or siRNA targeting mRNAs. In contrast, downstream cleavage products generated by ASOs targeting nuclear long non-coding RNA Malat 1 and pre-mRNA were degraded by nuclear XRN2. The downstream cleavage products did not appear to be degraded in the 3' to 5' direction as the majority of these products contained intact poly(A) tails and were bound by the poly(A) binding protein. The upstream cleavage products of Malat1 were degraded in the 3' to 5' direction by the exosome complex containing the nuclear exoribonuclease Dis3. The exosome complex containing Dis3 or cytoplasmic Dis3L1 degraded mRNA upstream cleavage products, which were not bound by the 5'-cap binding complex and, consequently, were susceptible to degradation in the 5' to 3' direction by the XRN exoribonucleases. PMID:26843429

  10. In Vitro and In Vivo Enhancement of Antitumoral Activity of Liposomal Antisense Oligonucleotides by Cineole as a Chemical Penetration Enhancer

    Hamid Reza Moghimi

    2015-01-01

    Full Text Available Cellular uptake and cytoplasmic release of liposomal antisense oligonucleotides (AsODNs, which can act as rate-limiting steps, are still remained to be completely optimized. Here, the possibility of enhancing such processes at cellular and animal levels by cineole, as a penetration enhancer, was investigated. A cationic nanoliposome containing an AsODN against PKC-α and a cineole-containing nanoliposome were prepared and characterized. The effect of nanoliposomal cineole on sequence-specific cytotoxicity of nanoliposomal AsODN against A549, was studied in vitro (MTT, flow cytometry, fluorescence microscopy, and real time PCR and in vivo (xenograft lung tumor in nude mice using different concentrations and treatment times. Results showed specific cytotoxicity of nanoliposomal AsODN was increased significantly from 11% to 25% when A549 cells were exposed to 10 µg/mL cineole for 1 or 4 hours. This inhibitory effect was further increased to about 40% when the concentration was increased to 40 µg/mL for 1 hour. In animal studies, cineole significantly decreased the tumor volume (about 75% and increased its doubling time from 13 days to 31 days. A linear relationship exists between cineole concentration and its enhancement effects. Finally it was concluded that cineole, and possibly other membrane fluidizers, can improve nanoliposomal gene therapy at cellular and animal levels.

  11. Apoptosis of drug-resistant human ovarian carcinoma cell line COC1/DDP induced by survivin antisense oligonucleotides

    ZHENG Fei; RUAN Fei; XIE Xian-kuan; LIU Shao-yang

    2006-01-01

    @@ Currently, surgery-oriented treatment plays a major role in the treatment of ovarian cancer patients. But 5-year survival rate of patients is still around 30%. One of the main reasons for the Iow survival rate is the drug resistance of tumor cells against chemotherapy.1,2 The function of antiapoptosis in the course of initiation and progress of cancer has a close relationship with drug resistance of tumor cells. Survivin is a new discovered anti-apoptosis gene, its expression levels correlating with more aggressive disease and poor clinical outcome in many of these tumors. It has been reported that survivin is expressed during fetal development and in cancer tissues.3 Furthermore,survivin overexpression, by disrupting the balance between cell proliferation/differentiation and apoptosis, may relate with the resistance to a variety of apoptotic stimuli, including chemotherapy.4,5 We designed antisense oligonucleotides of survivin to treat the drug-resistant human ovarian carcinoma cell line COC1/DDP, and studied its effects on inducing COC1/DDP apoptosis. The purpose of this study was to find a novel approach to improve the sensitivity of ovarian carcinoma chemotherapy.

  12. Effect of Dexamethasone and Aquaporin-1 Antisense Oligonucleotides on the Aquaporin-1 Expression in Cultured Human Trabecular Meshwork Cells

    2006-01-01

    The changes in the expression of aquaporin-1 (AQP1) mRNA and protein in cultured human trabecular meshwork (HTM) cells treated with dexamethasone and transfected with antisense oligonucleotides (AS-ODN) were studied, and the implication of AQP1 regulation in corticosteroid-glaucoma and the possibility of AS-ODN inhibiting the AQP1 expression were evaluated.The cultured HTM cells in vitro were treated with different concentrations of dexamethasone and transfected with oligonucleotides for 5 days respectively. Then, total RNA and protein of HTM cells were extracted. The changes of AQP1 mRNA and protein were demonstrated qualitatively and quantitatively by RT-PCR and Western blot. Band intensities were detected by imaging analysis.There was a parallel relationship between the results of RT-PCR and those of Western blot. The expression levels of AQP1 mRNA and protein in dexamethasone-treated groups were increased initially and decreased later as dexamethasone concentration was stepped up. In the 0.04 μg/mL and 0.4 μg/mL groups, the levels of AQP1 were higher than in control group (0μg/mL). In the 4μg/mL and 40μg/mL groups, the AQP1 expression levels were lower than in control group. AS-ODN could down-regulate the expression of AQP1 mRNA and protein in a dose-dependent manner. At 5 μg/mL, down-regulation efficiency reached the maximum. There was no statistically significant difference in the expression of AQP1 mRNA and protein between all sense oligonucleotides groups and control group. It was suggested that dexamethasone may induce the changes of the AQP1 expression in HTM cells to be involved in the occurrence of corticosteroid-glaucoma. AS-ODN can down-regulate the AQP1 expression in HTM cells to some extent.

  13. Tissue distribution and physiologically based pharmacokinetics of antisense phosphorothioate oligonucleotide ISIS 1082 in rat.

    Peng, B; Andrews, J; Nestorov, I; Brennan, B; Nicklin, P; Rowland, M

    2001-02-01

    The aim of this study was to develop a whole body physiologically based model of the pharmacokinetics (PBPK) of the phosphorothioate oligonucleotide (PS-ODN) ISIS 1082 in vivo. Rats were administered an intravenous (i.v.) bolus dose of ISIS 1082 (10 mg/kg plus 3H tracer), and arterial blood and tissues were taken at specific times up to 72 hours. Radioactivity was measured in all samples. The parent compound was determined specifically in blood and tissues at 90 minutes and in liver and kidney also at 24 hours, using capillary gel electrophoresis (CGE). A whole body PBPK model was fitted to the combined blood and tissue radioactivity data using nonlinear regression analysis. CGE analysis indicated that the predominant species in plasma and all tissues is ISIS 1082, together with some n-1 and n-2 metabolites. Total radioactivity primarily reflects these species. The whole body model successfully described temporal events in all tissues. However, to adequately model the experimental data, all tissues had to be partitioned into vascular and extravascular spaces to accommodate the relatively slow distribution of ISIS 1082 out of blood because of a permeability rate limitation. ISIS 1082 distributes extensively into tissues, but the relative affinity varies enormously, being highest for kidney and liver and lowest for muscle and brain. A whole body PBPK model with a permeability rate limited tissue distribution was developed that adequately described events in both blood and tissue for an oligonucleotide. This model has the potential not only to characterize the events in individual tissues throughout the body for such compounds but also to scale across animal species, including human. PMID:11258618

  14. Effect of 2'-O-methyl/thiophosphonoacetate-modified antisense oligonucleotides on huntingtin expression in patient-derived cells.

    Matsui, Masayuki; Threlfall, Richard N; Caruthers, Marvin H; Corey, David R

    2014-12-15

    Optimizing oligonucleotides as therapeutics will require exploring how chemistry can be used to enhance their effects inside cells. To achieve this goal it will be necessary to fully explore chemical space around the native DNA/RNA framework to define the potential of diverse chemical modifications. In this report we examine the potential of thiophosphonoacetate (thioPACE)-modified 2'-O-methyl oligoribonucleotides as inhibitors of human huntingtin (HTT) expression. Inhibition occurred, but was less than with analogous locked nucleic acid (LNA)-substituted oligomers lacking the thioPACE modification. These data suggest that thioPACE oligonucleotides have the potential to control gene expression inside cells. However, advantages relative to other modifications were not demonstrated. Additional modifications are likely to be necessary to fully explore any potential advantages of thioPACE substitutions. PMID:26865404

  15. Modulation of p53 expression using antisense oligonucleotides complementary to the 5'-terminal region of p53 mRNA in vitro and in the living cells.

    Agnieszka Gorska

    Full Text Available The p53 protein is a key player in cell response to stress events and cancer prevention. However, up-regulation of p53 that occurs during radiotherapy of some tumours results in radio-resistance of targeted cells. Recently, antisense oligonucleotides have been used to reduce the p53 level in tumour cells which facilitates their radiation-induced apoptosis. Here we describe the rational design of antisense oligomers directed against the 5'-terminal region of p53 mRNA aimed to inhibit the synthesis of p53 protein and its ΔNp53 isoform. A comprehensive analysis of the sites accessible to oligomer hybridization in this mRNA region was performed. Subsequently, translation efficiency from the initiation codons for both proteins in the presence of selected oligomers was determined in rabbit reticulocyte lysate and in MCF-7 cells. The antisense oligomers with 2'-OMe and LNA modifications were used to study the mechanism of their impact on translation. It turned out that the remaining RNase H activity of the lysate contributed to modulation of protein synthesis efficiency which was observed in the presence of antisense oligomers. A possibility of changing the ratio of the newly synthetized p53 and ΔNp53 in a controlled manner was revealed which is potentially very attractive considering the relationship between the functioning of these two proteins. Selected antisense oligonucleotides which were designed based on accessibility mapping of the 5'-terminal region of p53 mRNA were able to significantly reduce the level of p53 protein in MCF-7 cells. One of these oligomers might be used in the future as a support treatment in anticancer therapy.

  16. Nucleic acid sequence detection using multiplexed oligonucleotide PCR

    Nolan, John P.; White, P. Scott

    2006-12-26

    Methods for rapidly detecting single or multiple sequence alleles in a sample nucleic acid are described. Provided are all of the oligonucleotide pairs capable of annealing specifically to a target allele and discriminating among possible sequences thereof, and ligating to each other to form an oligonucleotide complex when a particular sequence feature is present (or, alternatively, absent) in the sample nucleic acid. The design of each oligonucleotide pair permits the subsequent high-level PCR amplification of a specific amplicon when the oligonucleotide complex is formed, but not when the oligonucleotide complex is not formed. The presence or absence of the specific amplicon is used to detect the allele. Detection of the specific amplicon may be achieved using a variety of methods well known in the art, including without limitation, oligonucleotide capture onto DNA chips or microarrays, oligonucleotide capture onto beads or microspheres, electrophoresis, and mass spectrometry. Various labels and address-capture tags may be employed in the amplicon detection step of multiplexed assays, as further described herein.

  17. Summarization on the synthesis and radionuclide-labeling of peptide nucleic acid for an oligonucleotide analogue

    Peptide nucleic acid (PNA), which is one kind of antisense nucleic acid compounds and an oligonucleotide analogue that binds strongly to DNA and RNA in a sequence specific manner, has its unique advantages in the field of molecular diagnostics and treatment of diseases. Now, people gradually attach more importance to PNA. To optimize the application of PNA in genetic re- search and therapy, a great number of backbone modifications on the newly- type structures of PNA were synthesized to improve its physicochemical proper- ties, such as hybridization speciality, solubility in biofluid, or cell permeability. The modified PNA labeled with radionuclides, which can obtain the aim at specific target and minimal non-target trauma, has important role in research and application of tumorous genitherapy. Here a review on the basic synthesis idea and several primary synthetic methods of PNA analogs was given, and also correlative studies and expectation on the compounds belonging to PNA series labeled with radionuclides were included. (authors)

  18. Effects of Repeated Complement Activation Associated with Chronic Treatment of Cynomolgus Monkeys with 2'-O-Methoxyethyl Modified Antisense Oligonucleotide.

    Shen, Lijiang; Engelhardt, Jeffrey A; Hung, Gene; Yee, Jenna; Kikkawa, Rie; Matson, John; Tayefeh, Bryan; Machemer, Todd; Giclas, Patricia C; Henry, Scott P

    2016-08-01

    The effects of repeated complement activation in cynomolgus monkeys after chronic antisense oligonucleotide (ASO) treatment were evaluated by using ISIS 104838, a representative 2'-O-methoxyethyl (2'-MOE) modified ASO. The treatment was up to 9 months with a total weekly dose of 30 mg/kg, given either as daily [4.3 mg/kg/day, subcutaneous (s.c.) injection] or once weekly [30 mg/kg, either as s.c. injection or 30-min intravenous (i.v.) infusion]. Acute elevations of complement split products (Bb and C3a) and a transient decrease in C3 occurred after the first dose and were drug plasma concentration dependent. However, with repeated complement activation after chronic ASO treatment, there were progressive increases in basal (predose) levels of Bb and C3a, and a sustained C3 reduction in all treated groups. There was also a progressive increase in C3d-bound circulating immune complex (CIC) that was considered secondary to the C3 depletion. Evidence of vascular inflammation was observed, mostly in the liver, kidney, and heart, and correlated with severe C3 depletion and increases in plasma IgG and IgM. Vascular inflammation was accompanied by increased C3 and IgM immunereactivity in the affected vasculatures and endothelial activation markers in serum. In summary, repeated complement activations in monkeys lead to a sustained decrease in circulating C3 over time. The concomitantly increased inflammatory signals and decreased CIC clearance due to impairment of complement function may lead to vascular inflammation after chronic ASO treatment in monkeys. However, based on the known sensitivity of monkeys to ASO-induced complement activation, these findings have limited relevance to humans. PMID:27140858

  19. Dynamics of co-transcriptional pre-mRNA folding influences the induction of dystrophin exon skipping by antisense oligonucleotides.

    Keng Boon Wee

    Full Text Available Antisense oligonucleotides (AONs mediated exon skipping offers potential therapy for Duchenne muscular dystrophy. However, the identification of effective AON target sites remains unsatisfactory for lack of a precise method to predict their binding accessibility. This study demonstrates the importance of co-transcriptional pre-mRNA folding in determining the accessibility of AON target sites for AON induction of selective exon skipping in DMD. Because transcription and splicing occur in tandem, AONs must bind to their target sites before splicing factors. Furthermore, co-transcriptional pre-mRNA folding forms transient secondary structures, which redistributes accessible binding sites. In our analysis, to approximate transcription elongation, a "window of analysis" that included the entire targeted exon was shifted one nucleotide at a time along the pre-mRNA. Possible co-transcriptional secondary structures were predicted using the sequence in each step of transcriptional analysis. A nucleotide was considered "engaged" if it formed a complementary base pairing in all predicted secondary structures of a particular step. Correlation of frequency and localisation of engaged nucleotides in AON target sites accounted for the performance (efficacy and efficiency of 94% of 176 previously reported AONs. Four novel insights are inferred: (1 the lowest frequencies of engaged nucleotides are associated with the most efficient AONs; (2 engaged nucleotides at 3' or 5' ends of the target site attenuate AON performance more than at other sites; (3 the performance of longer AONs is less attenuated by engaged nucleotides at 3' or 5' ends of the target site compared to shorter AONs; (4 engaged nucleotides at 3' end of a short target site attenuates AON efficiency more than at 5' end.

  20. XRN2 is required for the degradation of target RNAs by RNase H1-dependent antisense oligonucleotides

    Antisense oligonucleotides (ASOs) can suppress the expression of a target gene by cleaving pre-mRNA and/or mature mRNA via RNase H1. Following the initial endonucleolytic cleavage by RNase H1, the target RNAs are degraded by a mechanism that is poorly understood. To better understand this degradation pathway, we depleted the expression of two major 5′ to 3′ exoribonucleases (XRNs), named XRN1 and XRN2, and analyzed the levels of 3′ fragments of the target RNAs in vitro. We found that the 3′ fragments of target pre-mRNA generated by ASO were almost completely degraded from their 5′ ends by nuclear XRN2 after RNase H1-mediated cleavage, whereas the 3′ fragments of mature mRNA were partially degraded by XRN2. In contrast to ASO, small interference RNA (siRNA) could reduce the expression level of only mature mRNA, and the 3′ fragment was degraded by cytoplasmic XRN1. Our findings indicate that the RNAs targeted by RNase H1-dependent ASO are rapidly degraded in the nucleus, contrary to the cytoplasmic degradation pathway mediated by siRNA. - Highlights: • We compared the degradation mechanism of the transcript targeted by ASO and siRNA. • We focused on two 5′ to 3′ exoribonucleases, cytoplasmic XRN1, and nuclear XRN2. • The 3′ fragment of target pre-mRNA generated by ASO was degraded by XRN2. • The 3′ fragment of target mRNA generated by ASO was partially degraded by XRN2. • XRN1 depletion promoted accumulation of the 3′ fragment of mRNA generated by siRNA

  1. Curcumin synergistically augments bcr/abl phosphorethieate antisense oligonucleotides to inhibit growth of chronic myelogenous leukemia cells

    Kun-zhong ZHANG; Jian-hua XU; Xiu-wang HUANG; Li-xian WU; Yu SU; Yuan-zhong CHEN

    2007-01-01

    Aim: To investigate the growth inhibition effect of the combination of bcr/abl phosphorothioate antisense oligonucleotides (PS-ASODN) and curcumin (cur), and the possible mechanisms of cur on the chronic myelogenous leukemia cell line K562. Methods: The K562 cell line was used as a P210bcr/abl-positive cell model in vitro and was exposed to different concentrations of PS-ASODN (0-20 μmol/L), cur (0-20 μmol/L), or a combination of both. Growth inhibition and apoptosis of K562 cells were assessed by MTT assay and AO/EB fluorescent staining, respec-tively. The expression levels of P210bct/abl, NF-κB and heat shock protein 90 (Hsp90) were assessed by Western blot. Results: Exposure to cur (5-20 μmol/L) and PS-ASODN (5-20 μmol/L) resulted in a synergistic inhibitory effect on cell growth.Growth inhibition was associated with the inhibition of the proliferation and in-duction of apoptosis. Western blot analysis showed that the drugs synergisti-cally downregulated the level of P210bcr/abl and NF-κB. Cur downregulated Hsp90,whereas no synergism was observed when cur was combined with PS-ASODN.Conclusion: PS-ASODN and cur exhibited a synergistic inhibitory effect on the cell growth of K562. The synergistic growth inhibition was mediated through different mechanisms that involved the inhibition of P210bcr/abl.

  2. Targeting eukaryotic translation in mesothelioma cells with an eIF4E-specific antisense oligonucleotide.

    Blake A Jacobson

    Full Text Available BACKGROUND: Aberrant cap-dependent translation is implicated in tumorigenesis in multiple tumor types including mesothelioma. In this study, disabling the eIF4F complex by targeting eIF4E with eIF4E-specific antisense oligonucleotide (4EASO is assessed as a therapy for mesothelioma. METHODS: Mesothelioma cells were transfected with 4EASO, designed to target eIF4E mRNA, or mismatch-ASO control. Cell survival was measured in mesothelioma treated with 4EASO alone or combined with either gemcitabine or pemetrexed. Levels of eIF4E, ODC, Bcl-2 and β-actin were assessed following treatment. Binding to a synthetic cap-analogue was used to study the strength of eIF4F complex activation following treatment. RESULTS: eIF4E level and the formation of eIF4F cap-complex decreased in response to 4EASO, but not mismatch control ASO, resulting in cleavage of PARP indicating apoptosis. 4EASO treatment resulted in dose dependent decrease in eIF4E levels, which corresponded to cytotoxicity of mesothelioma cells. 4EASO resulted in decreased levels of eIF4E in non-malignant LP9 cells, but this did not correspond to increased cytotoxicity. Proteins thought to be regulated by cap-dependent translation, Bcl-2 and ODC, were decreased upon treatment with 4EASO. Combination therapy of 4EASO with pemetrexed or gemcitabine further reduced cell number. CONCLUSION: 4EASO is a novel drug that causes apoptosis and selectively reduces eIF4E levels, eIF4F complex formation, and proliferation of mesothelioma cells. eIF4E knockdown results in decreased expression of anti-apoptotic and pro-growth proteins and enhances chemosensitivity.

  3. XRN2 is required for the degradation of target RNAs by RNase H1-dependent antisense oligonucleotides

    Hori, Shin-Ichiro; Yamamoto, Tsuyoshi; Obika, Satoshi, E-mail: obika@phs.osaka-u.ac.jp

    2015-08-21

    Antisense oligonucleotides (ASOs) can suppress the expression of a target gene by cleaving pre-mRNA and/or mature mRNA via RNase H1. Following the initial endonucleolytic cleavage by RNase H1, the target RNAs are degraded by a mechanism that is poorly understood. To better understand this degradation pathway, we depleted the expression of two major 5′ to 3′ exoribonucleases (XRNs), named XRN1 and XRN2, and analyzed the levels of 3′ fragments of the target RNAs in vitro. We found that the 3′ fragments of target pre-mRNA generated by ASO were almost completely degraded from their 5′ ends by nuclear XRN2 after RNase H1-mediated cleavage, whereas the 3′ fragments of mature mRNA were partially degraded by XRN2. In contrast to ASO, small interference RNA (siRNA) could reduce the expression level of only mature mRNA, and the 3′ fragment was degraded by cytoplasmic XRN1. Our findings indicate that the RNAs targeted by RNase H1-dependent ASO are rapidly degraded in the nucleus, contrary to the cytoplasmic degradation pathway mediated by siRNA. - Highlights: • We compared the degradation mechanism of the transcript targeted by ASO and siRNA. • We focused on two 5′ to 3′ exoribonucleases, cytoplasmic XRN1, and nuclear XRN2. • The 3′ fragment of target pre-mRNA generated by ASO was degraded by XRN2. • The 3′ fragment of target mRNA generated by ASO was partially degraded by XRN2. • XRN1 depletion promoted accumulation of the 3′ fragment of mRNA generated by siRNA.

  4. Effect of nuclear factor antisense oligonucleotide on cardiac muscle myosin isoenzymes and cytokines in rat models of chronic heart failure

    Objective: To investigate the effect of nuclear factor kappa B (NF-κB) antisense oligonucleotide (AS-ON) on cardiac muscle myosin isoenzymes (MI) and serum cytokines (TNF-α, IL-1β, Fas) expressions in rat models of chronic heart failure. Methods: Wistar rat models of chronic heart failure were prepared with abdominal aorta constriction. Half of the models were treated with intrapericardial injection of 0.5ml AS-ON at the time of model preparation. Control rats were given intrapericardial injection of normal saline. Non-invasive echocardiographic study or invasive hemodynamic studies with sacrifice of the animal and procurement of left ventricular cardiac muscle for examination of myosin isoenzymes with SDS-PAGE were performed on 10 models each eveny two weeks until six months after establishment of the models. Inner canthus blood aspiration for determination of serum cytokines (TNF -α and IL-1β with RIA and Fas with ELISA) were done at the same time. Results: In the models without AS-ON treatment, cardiac function was deterioated somewhat at 3 months and frank cardiac failure was apparent at 6 months. In the AS-OD treated models, carbiac function parameters were much better, with lower TNF-α, IL-1β and Fas levels as well as less V1→V3 shift in myosin isoenzymes. Conclusion: Intrapericardial injection of AS-ON was of great benefit in prevention of development of cardiac failure in the rat models with abdominal aorta constriction, probably throngh maintainence of normal cytokines network as well as inbibition of V1 →V3 shift of myosin isoenzymes. (authors)

  5. Comparative analysis of antisense oligonucleotide sequences for targeted skipping of Exon 51 during dystrophin Pre-mRNA splicing in human muscle

    Arechavala-Gomeza, V.; Graham, I R; Popplewell, L. J.; Adams, A.M.; Aartsma-Rus, A.; Kinali, M.; Morgan, J E; van Deutekom, J C; Wilton, S D; Dickson, G.; Muntoni, F.

    2007-01-01

    Duchenne muscular dystrophy (DMD) is caused by mutations in the dystrophin gene that result in the absence of functional protein. In the majority of cases these are out-of-frame deletions that disrupt the reading frame. Several attempts have been made to restore the dystrophin mRNA reading frame by modulation of pre-mRNA splicing with antisense oligonucleotides (AOs), demonstrating success in cultured cells, muscle explants, and animal models. We are preparing for a phase I/IIa clinical trial...

  6. Comparative Characterization of Hepatic Distribution and mRNA Reduction of Antisense Oligonucleotides Conjugated with Triantennary N-Acetyl Galactosamine and Lipophilic Ligands Targeting Apolipoprotein B.

    Watanabe, Ayahisa; Nakajima, Mado; Kasuya, Takeshi; Onishi, Reina; Kitade, Naohisa; Mayumi, Kei; Ikehara, Tatsuya; Kugimiya, Akira

    2016-05-01

    TriantennaryN-acetyl galactosamine (GalNAc, GN3) and lipophilic ligands such as cholesterol andα-tocopherol conjugations dramatically improve the distribution and efficacy of second-generation antisense oligonucleotides (ASOs) in the whole liver. To characterize ligands for delivery to liver cells based on pharmacokinetics and efficacy, we used a locked nucleic acid gapmer of ASO targeting apolipoprotein B as a model compound and evaluated the amount of ASO and apolipoprotein B mRNA in the whole liver, hepatocytes, and nonparenchymal (NP) cells as well as plasma total cholesterol after administration of ASO conjugated with these ligands to mice. Compared with unconjugated ASO, GN3 conjugation increased the amount (7-fold) and efficacy (more than 10-fold) of ASO in hepatocytes only and showed higher efficacy than the increased rate of the amount of ASO. On the other hand, lipophilic ligand conjugations led to increased delivery (3- to 5-fold) and efficacy (5-fold) of ASO to both hepatocytes and NP cells. GN3 and lipophilic ligand conjugations increased the area under the curve of ASOs and the pharmacodynamic duration but did not change the half-life in hepatocytes and NP cells compared with unconjugated ASO. In the liver, the phosphodiester bond between ASO and these ligands was promptly cleaved to liberate unconjugated ASO. These ligand conjugations reduced plasma total cholesterol compared with unconjugated ASO, although these ASOs were well tolerated with no elevation in plasma transaminases. These findings could facilitate ligand selection tailored to liver cells expressed in disease-related genes and could contribute to the discovery and development of RNA interference-based therapy. PMID:26907624

  7. Lack of Interactions Between an Antisense Oligonucleotide with 2'-O-(2-Methoxyethyl) Modifications and Major Drug Transporters.

    Yu, Rosie Z; Warren, Mark S; Watanabe, Tanya; Nichols, Brandon; Jahic, Mirza; Huang, Jane; Burkey, Jennifer; Geary, Richard S; Henry, Scott P; Wang, Yanfeng

    2016-04-01

    ISIS 141923 is a model compound of 2'-O-(2-methoxyethyl) (2'-MOE) modified antisense oligonucleotides (ASOs). The purpose of this study is to determine whether ISIS 141923 is a substrate or an inhibitor against a panel of nine major uptake or efflux drug transporters, namely breast cancer resistance protein (BCRP), P-glycoprotein (P-gp), organic anion transporter (OAT)1, OAT3, organic cation transporter (OCT)1, OCT2, organic anion transporting polypeptide 1B (OATP1B)1, OATP1B3, and bile salt export pump (BSEP), in vitro. The uptake test system for transporters in the solute carrier (SLC) family (OAT1, OAT3, OCT1, OCT2, OATP1B1, and OATP1B3) was studied in Madin-Darby canine kidney (MDCK)-II cells transfected to express the transporters of interest. BCRP was studied using carcinoma colon-2 (Caco-2) cells with endogenously expressed BCRP. P-gp transporter was studied in MDCK-multi-drug resistance 1 (MDR1) cells, while BSEP was studied using Spodoptera frugiperda 9 (Sf9) membrane vesicles containing human BSEP. The ISIS 141293 concentrations evaluated were 10 and 100 μM for the substrate and inhibition study, respectively. Cellular uptake of ISIS 141923 was analyzed using a high performance liquid chromatography-mass spectrometry method, while concentrations of known substrates (used as positive controls) of each transporters evaluated were determined by radiometric detection. At 10 μM ISIS 141923, there was no significant transporter-mediated uptake of ISIS 141923 (P > 0.05) in the SLC family, and the efflux ratios were not above 2.0 for either BCRP or P-gp. Therefore, no transporter-mediated uptake of ISIS 141923 was observed by any of the nine transporters studied. At 100 μM ISIS 141923, the % inhibition was in the range of -16.0% to 19.0% for the nine transporters evaluated. Therefore, ISIS 141923 is not considered as an inhibitor of the nine transporters studied. Overall, the results from this study suggest that it is unlikely that ISIS 141923 or similar 2

  8. Cationic polyelectrolyte-mediated delivery of antisense morpholino oligonucleotides for exon-skipping in vitro and in mdx mice

    Wang M

    2015-09-01

    Full Text Available Mingxing Wang, Bo Wu, Jason D Tucker, Peijuan Lu, Qilong Lu Department of Neurology, McColl-Lockwood Laboratory for Muscular Dystrophy Research, Cannon Research Center, Carolinas Medical Center, Charlotte, NC, USA Abstract: In this study, we investigated a series of cationic polyelectrolytes (PEs with different size and composition for their potential to improve delivery of an antisense phosphorodiamidate morpholino oligomer (PMO both in vitro and in vivo. The results showed that the poly(diallyldimethylammonium chloride (PDDAC polymer series, especially PE-3 and PE-4, improves the delivery efficiency of PMO, comparable with Endoporter-mediated PMO delivery in vitro. The enhanced PMO delivery and targeting to dystrophin exon 23 was further observed in mdx mice, up to fourfold with the PE-4, compared with PMO alone. The cytotoxicity of the PEs was lower than that of Endoporter and polyethylenimine 25,000 Da in vitro, and was not clearly detected in muscle in vivo under the tested concentrations. Together, these results demonstrate that optimization of PE molecular size, composition, and distribution of cationic charge are key factors to achieve enhanced PMO exon-skipping efficiency. The increased efficiency and lower toxicity show this PDDAC series to be capable gene/antisense oligonucleotide delivery-enhancing agents for treating muscular dystrophy and other diseases. Keywords: cationic polyelectrolytes, antisense delivery, exon-skipping, PMO, muscular dystrophy

  9. PLGA-PEG-PLGA microspheres as a delivery vehicle for antisense oligonucleotides to CTGF: Implications on post-surgical peritoneal adhesion prevention

    Azeke, John Imuetinyan-Jesu, Jr.

    Abdominal adhesions are the aberrant result of peritoneal wound healing commonly associated with surgery and inflammation. A subject of a large number of studies since the first half of the last century, peritoneal adhesion prevention has, for the most part, evaded the scientific community and continues to cost Americans an estimated $2-4 billion annually. It is known that transforming growth factor-beta (TGF-beta) plays a key role in the wound healing cascade; however, suppression of this multifunctional growth factor's activity may have more harmful consequences than can be tolerated. As a result, much attention has fallen on connective tissue growth factor (CTGF), a downstream mediator of TGF-beta's fibrotic action. It has been demonstrated in several in vitro models, that the suppression of CTGF hinders fibroblast proliferation, a necessary condition for fibrosis. Furthermore, antisense oligonucleotides (antisense oligos, AO) to CTGF have been shown to knock down CTGF mRNA levels by specifically hindering the translation of CTGF protein. Antisense technologies have met with a great deal of excitement as a viable means of preventing diseases such as adhesions by hindering protein translation at the mRNA level. However, the great challenge associated with the use of these drugs lies in the short circulation time when administered "naked". Viral delivery systems, although excellent platforms in metabolic studies, are not ideal for diagnostic use because of the inherent danger associated with viral vectors. Microparticles made of biodegradable polymers have therefore presented themselves as a viable means of delivering these drugs to target cells over extended periods. Herein, we present two in vivo studies confirming the up-regulation of TGF-beta protein and CTGF mRNA following injury to the uterine tissues of female rats. We were able to selectively knockdown post-operative CTGF protein levels following surgery, however, our observations led us to conclude that

  10. Combination of telomerase antisense oligonucleotides simultaneously targeting hTR and hTERT produces synergism of inhibition of telomerase activity and growth in human colon cancer cell line

    FU, XIAO-HUA; Zhang, Jian-Song; Zhang, Na; Zhang, Yang-de

    2005-01-01

    AIM: To investigate synergism of inhibition of telomerase activity and proliferation of human colon cancer cells by combination of telomerase antisense oligonucleotides (ASODNs) simultaneously targeting human telomerase RNA (hTR) and human telomerase reverse transcriptase (hTERT) in vitro.

  11. Beneficial metabolic effects of CB1R anti-sense oligonucleotide treatment in diet-induced obese AKR/J mice.

    Yuting Tang

    Full Text Available An increasing amount of evidence supports pleiotropic metabolic roles of the cannibinoid-1 receptor (CB1R in peripheral tissues such as adipose, liver, skeletal muscle and pancreas. To further understand the metabolic consequences of specific blockade of CB1R function in peripheral tissues, we performed a 10-week-study with an anti-sense oligonucleotide directed against the CB1R in diet-induced obese (DIO AKR/J mice. DIO AKR/J mice were treated with CB1R ASO Isis-414930 (6.25, 12.5 and 25 mg/kg/week or control ASO Isis-141923 (25 mg/kg/week via intraperitoneal injection for 10 weeks. At the end of the treatment, CB1R mRNA from the 25 mg/kg/week CB1R ASO group in the epididymal fat and kidney was decreased by 81% and 63%, respectively. Body weight gain was decreased in a dose-dependent fashion, significantly different in the 25 mg/kg/week CB1R ASO group (46.1±1.0 g vs veh, 51.2±0.9 g, p<0.05. Body fat mass was reduced in parallel with attenuated body weight gain. CB1R ASO treatment led to decreased fed glucose level (at week 8, 25 mg/kg/week group, 145±4 mg/dL vs veh, 195±10 mg/dL, p<0.05. Moreover, CB1R ASO treatment dose-dependently improved glucose excursion during an oral glucose tolerance test, whereas control ASO exerted no effect. Liver steatosis was also decreased upon CB1R ASO treatment. At the end of the study, plasma insulin and leptin levels were significantly reduced by 25 mg/kg/week CB1R ASO treatment. SREBP1 mRNA expression was decreased in both epididymal fat and liver. G6PC and fatty acid translocase/CD36 mRNA levels were also reduced in the liver. In summary, CB1R ASO treatment in DIO AKR/J mice led to improved insulin sensitivity and glucose homeostasis. The beneficial effects of CB1R ASO treatment strongly support the notion that selective inhibition of the peripheral CB1R, without blockade of central CB1R, may serve as an effective approach for treating type II diabetes, obesity and the metabolic syndrome.

  12. Anti-Urokinase Receptor Antisense Oligonucleotide (uPAR-aODN) to Prevent and Cure Long-Term Space Exploration-Related Retinal Pathological Angiogenesis

    Lazzarano, Stefano; Lulli, Matteo; Fibbi, Gabriella; Margheri, Francesca; Papucci, Laura; Serrati, Simona; Witort, Ewa; Chilla, Anastasia; Lapucci, Andrea; Donnini, Martino; Quaglierini, Paolo; Romiti, Alice; Specogna, Rebecca; Del Rosso, Mario; Capaccioli, Sergio

    2008-06-01

    Angiogenesis underlies a variety of physiological processes and its possible deregulation during long term space exploration needs to be investigated. Angiogenesis is a multistep process of new blood capillary formation, where degradation of the extracellular matrix (ECM) by proteolytic enzymes, including uPA (urokinase plasminogen activator) and opening the way to migration of endothelial cells (EC), is critical. Plasminogen activation system regulates angiogenesis by both uPA-driven ECM degradation and uPA receptor (uPAR). Microgravity and low dose irradiations promote tissue neoangiogeenesis and neovascularization is often common occurence in ophthalmologic pathologies. We have designed and patented the uPAR antisense oligonucleotide (aODN) and evaluated its antiangiogenetic activity by EC cellular migration and capillary morphogenesis assays. The uPAR aODN treatment caused a 75% inhibition of human microvascular EC migration and a complete inhibition of capillary morphogenesis, suggesting its therapeutic application to prevent neoangiogenesis-related ophthalmologic pathologies during space exploration.

  13. Effects of connective tissue growth factor antisense oligonucleotides on the proliferation and collagen synthesis of the cultured human keloid fibroblasts in vitro

    刘剑毅; 李世荣; 纪淑兴

    2004-01-01

    Objective: To explore the effects of connective tissue growth factor (CTGF) on the pathogenesis of human keloid. Methods: CTGF antisense oligonucleotides (ASODN) conjugated with isothiocyananate fluorescence was encapsulated by liposome, and then added into the human keloid fibroblasts (HKFs) culture media. The intracellular distribution of CTGF ASODN was observed by fluorescence microscopy in the fixed HKFs. The proliferation of HKFs was measured by MTT test. The collagen synthesis of HKFs was measured by 3H-proline incorporation method. Results: Compared with control group, the CTGF ASODN can inhibit the proliferation and collagen synthesis of the HKFs (P < 0.01 ). Conclusion: CTGF ASODN has anti-fibrotic effects on keloid in vitro, and CTGF play an important role in promoting the fibrosis of keloid.

  14. Antisense Therapy in Neurology

    Lee, Joshua J.A.; Toshifumi Yokota

    2013-01-01

    Antisense therapy is an approach to fighting diseases using short DNA-like molecules called antisense oligonucleotides. Recently, antisense therapy has emerged as an exciting and promising strategy for the treatment of various neurodegenerative and neuromuscular disorders. Previous and ongoing pre-clinical and clinical trials have provided encouraging early results. Spinal muscular atrophy (SMA), Huntington’s disease (HD), amyotrophic lateral sclerosis (ALS), Duchenne muscular dystrophy (DMD)...

  15. Anti-inflammatory activity of chitosan nanoparticles carrying NF-κB/p65 antisense oligonucleotide in RAW264.7 macropghage stimulated by lipopolysaccharide.

    Ma, Li; Shen, Chuan-An; Gao, Lei; Li, Da-Wei; Shang, Yu-Ru; Yin, Kai; Zhao, Dong-Xu; Cheng, Wen-Feng; Quan, Dong-Qin

    2016-06-01

    The purpose of this present study is to prepare NF-κB/p65 antisense oligonucleotide loaded chitosan nanoparticles (NPs) and evaluate their physicochemical characterization and antisense effects in RAW264.7 macrophages. Condensed nanoparticles with mean particle size of 128±16nm, average Zeta potential of 19.6±6.3mV and high entrapment efficiency (EE) of 98.6±0.11% were formed between NF-κB/p65 antisense gene (NAG) and chitosan by complex coacervation method. Trypan blue staining and MTT tests showed that NAG chitosan NPs had no toxic effect on RAW264.7 macrophages when the dose was no more than 20μg/mL. Confocal microscopy images showed that NAG chitosan NPs were capable to deliver NAG into cytoplasm of RAW264.7 macrophages and finally into nucleus. Real-time PCR tests verified that NAG chitosan NPs could significantly decrease the mRNA expression level of NF-κB/p65 and inflammatory cytokines including TNF-ɑ, IL-1 and IL-6. Accordingly, western blot study showed that NAG NPs uptaken in the cells could efficiently reversed the expression of NF-κB/p65 protein induced by LPS. At last, downstream release level of inflammatory factors including TNF-ɑ, IL-1 and IL-6 in LPS stimulated RAW264.7 macrophages was significantly decreased after treated by NAG chitosan NPs. It could be concluded that chitosan NPs were excellent delivery vectors to ferry the NAG into the cytoplasm and nucleus of macrophages. The NAG chitosan NPs might be a novel therapeutic apparatus for the treatment of LPS induced sepsis by inhibiting NF-κB-related pro-inflammatory cytokines secretion. PMID:26970817

  16. Peptide nucleic acid (PNA) cell penetrating peptide (CPP) conjugates as carriers for cellular delivery of antisense oligomers

    Shiraishi, Takehiko; Nielsen, Peter E

    2012-01-01

    We have explored the merits of a novel delivery strategy for the antisense oligomers based on cell penetrating peptide (CPP) conjugated to a carrier PNA with sequence complementary to part of the antisense oligomer. The effect of these carrier CPP-PNAs was evaluated by using antisense PNA targeting...... splicing correction of the mutated luciferase gene in the HeLa pLuc705 cell line, reporting cellular (nuclear) uptake of the antisense PNA via luciferase activity measurement. Carrier CPP-PNA constructs were studied in terms of construct modification (with octaarginine and/or decanoic acid) and carrier PNA...... length (to adjust binding affinity). In general, the carrier CPP-PNA constructs including the ones with decanoyl modification provided significant increase of the activity of unmodified antisense PNA as well as of antisense octaarginine-PNA conjugates. Antisense activity, and by inference cellular...

  17. Dopamine-induced apoptosis in human neuronal cells: inhibition by nucleic acides antisense to the dopamine transporter

    Human neuroblastoma NMB cells take up [3H]dopamine in a selective manner indicating that dopamine transporters are responsible for this uptake. These cells were therefore used as a model to study dopamine neurotoxicity, and to elucidate the role of dopamine transporters in controlling cell death. Treatment with 0.05-0.4 mM dopamine changed cells' morphology within 4 h, accompanied by retraction of processes, shrinkage, apoptosis-like atrophy, accumulation of apoptotic particles, DNA fragmentation and cell death. Cycloheximide inhibited dopamine's effect, suggesting that induction of apoptosis by dopamine was dependent upon protein synthesis. Dopamine cytotoxicity, monitored morphologically by flow cytometric analysis, and by lactate dehydrogenase released, was blocked by cocaine but not by the noradrenaline and serotonin uptake blockers desimipramine and imipramine, respectively. Attempting to inhibit dopamine transport and toxicity in a drug-free and highly selective way, three 18-mer dopamine transporter antisense phosphorothioate oligonucleotides (numbers 1, 2 and 3) and a new plasmid vector expressing the entire rat dopamine transporter complementary DNA in the antisense orientation were prepared and tested. Antisense phosphorothioate oligonucleotide 3 inhibited [3H]dopamine uptake in a time- and dose-dependent manner. Likewise, transient transfection of NMB cells with the plasmid expressing dopamine transporter complementary DNA in the antisense orientation partially blocked [3H]dopamine uptake. Antisense phosphorothioate oligonucleotide 3 also decreased, dose-dependently, the toxic effect of dopamine and 6-hydroxydopamine. Western blot analysis with newly prepared anti-human dopamine transporter antibodies showed that antisense phosphorothioate oligonucleotide 3 decreased the transporter protein level. These studies contribute to better understand the mechanism of dopamine-induced apoptosis and neurotoxicity. (Copyright (c) 1996 Elsevier Science B

  18. Cationic polyelectrolyte-mediated delivery of antisense morpholino oligonucleotides for exon-skipping in vitro and in mdx mice

    Wang, Mingxing; Wu, Bo; Tucker, Jason D; Lu, Peijuan; Lu, Qilong

    2015-01-01

    In this study, we investigated a series of cationic polyelectrolytes (PEs) with different size and composition for their potential to improve delivery of an antisense phosphorodiamidate morpholino oligomer (PMO) both in vitro and in vivo. The results showed that the poly(diallyldimethylammonium chloride) (PDDAC) polymer series, especially PE-3 and PE-4, improves the delivery efficiency of PMO, comparable with Endoporter-mediated PMO delivery in vitro. The enhanced PMO delivery and targeting t...

  19. Inefficient cationic lipid-mediated siRNA and antisense oligonucleotide transfer to airway epithelial cells in vivo

    Hu Jim

    2006-02-01

    Full Text Available Abstract Background The cationic lipid Genzyme lipid (GL 67 is the current "gold-standard" for in vivo lung gene transfer. Here, we assessed, if GL67 mediated uptake of siRNAs and asODNs into airway epithelium in vivo. Methods Anti-lacZ and ENaC (epithelial sodium channel siRNA and asODN were complexed to GL67 and administered to the mouse airway epithelium in vivo Transfection efficiency and efficacy were assessed using real-time RT-PCR as well as through protein expression and functional studies. In parallel in vitro experiments were carried out to select the most efficient oligonucleotides. Results In vitro, GL67 efficiently complexed asODNs and siRNAs, and both were stable in exhaled breath condensate. Importantly, during in vitro selection of functional siRNA and asODN we noted that asODNs accumulated rapidly in the nuclei of transfected cells, whereas siRNAs remained in the cytoplasm, a pattern consistent with their presumed site of action. Following in vivo lung transfection siRNAs were only visible in alveolar macrophages, whereas asODN also transfected alveolar epithelial cells, but no significant uptake into conducting airway epithelial cells was seen. SiRNAs and asODNs targeted to β-galactosidase reduced βgal mRNA levels in the airway epithelium of K18-lacZ mice by 30% and 60%, respectively. However, this was insufficient to reduce protein expression. In an attempt to increase transfection efficiency of the airway epithelium, we increased contact time of siRNA and asODN using the in vivo mouse nose model. Although highly variable and inefficient, transfection of airway epithelium with asODN, but not siRNA, was now seen. As asODNs more effectively transfected nasal airway epithelial cells, we assessed the effect of asODN against ENaC, a potential therapeutic target in cystic fibrosis; no decrease in ENaC mRNA levels or function was detected. Conclusion This study suggests that although siRNAs and asODNs can be developed to inhibit

  20. Antisense mediated exon skipping therapy for duchenne muscular dystrophy (DMD).

    Brolin, Camilla; Shiraishi, Takehiko

    2011-01-01

    Duchenne Muscular Dystrophy (DMD) is a lethal disease caused by mutations in the dystrophin gene (DMD) that result in the absence of essential muscle protein dystrophin. Among many different approaches for DMD treatment, exon skipping, mediated by antisense oligonucleotides, is one of the most promising methods for restoration of dystrophin expression. This approach has been tested extensively targeting different exons in numerous models both in vitro and in vivo. During the past 10 years, there has been a considerable progress by using DMD animal models involving three types of antisense oligonucleotides (2'-O-methyl phosphorothioate (2OME-PS), phosphorodiamidate morpholino oligomer (PMO)) and peptide nucleic acid (PNA). PMID:21686247

  1. Inhibition of human telomerase reverse transcriptase in vivo and in vitro for retroviral vector-based antisense oligonucleotide therapy in ovarian cancer.

    Qi, Z; Mi, R

    2016-01-01

    Human telomerase is absent in most normal tissues, but is abnormally activated in all major cancer cells. Telomerase enables tumor cells to maintain telomere length, allowing indefinite replicative capacity. Albeit not sufficient in itself to induce neoplasia, telomerase is believed to be necessary for cancer cells to grow without limit. Studies using an antisense oligonucleotide (ASODN) to the RNA component of telomerase or human telomerase reverse transcriptase (hTERT) demonstrate that telomerase in human tumor lines can be blocked in vivo. Inhibition of hTERT led to telomere shortening and cancer cell death, validating telomerase as a target for anticancer genetic therapy. Varieties of approaches for hTERT inhibition have been investigated. The aim of this study was to analyze the biological activity of ASODN to the hTERT mediated by retrovirus vector, which was used as therapy for ovarian tumor. We constructed and characterized a recombinant retrovirus vector with full-length hTERT antisense complementary DNA. The vector was introduced into ES-2 by lipofectamine-mediated gene transfection. The cellular proliferation and telomerase activity of the transformant cells were retarded. The hTERT gene expression and the telomerase activity of the transformant cells were both decreased. The transformant cells show partial reversion of the malignant phenotype. PT67 cells were also transfected with the recombinant vector and virus-producer cells were generated. The retrovirus-containing supernatant effectively inhibited the growth of human ovarian tumor xenografts in mouse models (subcutaneous tumor model), and enhanced the mouse survival time. PMID:26742579

  2. The Use of Gel Electrophoresis to Study the Reactions of Activated Amino Acids with Oligonucleotides

    Zieboll, Gerhard; Orgel, Leslie E.

    1994-01-01

    We have used gel electrophoresis to study the primary covalent addition of amino acids to oligonu-cleotides or their analogs and the subsequent addition of further molecules of the amino acids to generate peptides covalently linked to the oligonucleotides. We have surveyed the reactions of a variety of amino acids with the phosphoramidates derived from oligonucleotide 5 inches phosphates and ethylenediamine. We find that arginine and amino acids can interact with oligonucleotidesl through stacking interactions react most efficiently. D- and L-amino acids give indistinguishable families of products.

  3. Depressive Effect of the Antisense Oligonucleotides of C-myc and PCNA on the Proliferation of VSMC

    Qingxian Li; Yanfu Wang; Yuhua Liao; Huiling Zhang; Yanying Jiang

    2007-01-01

    To study the depressive effect of the antisense oligonuceotides (ASODN) of c-myc and proliferating cell nuclear antigen (PCNA) on the proliferation of VSMC.Methods Taking the VSMC obtained from rat aorta thoracalis cultured 4 ~ 8 generation as research object.The objects were divided into three groups to carry out control study:control group,PCNA ASODN group and c-myc ASODN group.The ASODNs' working concentration all were 1:50.The depressive effect of ASODN on VSMC proliferation was investigated by cell counting,MTT and 3H-TdR incorporation assay;PCNA and c-myc expression were detected by immunohistochemical method after transferring PCNA successfully;the corresponding gene was inhibited obviously;compared with control group ( P < 0.05 ).Conclusions PCNA and c-myc might play a considerable role in the VSMC proliferation process.The corresponding gene could be depressed successfully after transferring PCNA and c-myc ASODN into VSMC,and then the proliferation of VSMC was slowed down.This study presented a beneficial proposal and theoretical fundament for atherosclerotic treatment.

  4. Nucleoside phosphonic acids in oligonucleotide chemistry: Structural diversity versus properties of isopolar phosphonate internucleotide linkages

    Hurychová, Vladimíra; Kóšiová, Ivana; Kovačková, Soňa; Králíková, Šárka; Liboska, Radek; Pačes, Ondřej; Páv, Ondřej; Petrová, Magdalena; Rejman, Dominik; Rosenberg, Ivan; Točík, Zdeněk

    Berlin : Oligonucleotide Therapeutic Society, 2007. s. 244-245. [Annual Meeting of the Oligonucleotide Therapeutics Society /3./. 04.10.2007-06.10.2007, Berlin] R&D Projects: GA MŠk(CZ) LC06077; GA MŠk(CZ) LC06061; GA ČR GA203/05/0827; GA ČR GA202/05/0628 Institutional research plan: CEZ:AV0Z40550506 Keywords : phosphonic acids * oligonucleotides * isopolar phosphonate * internucleotide linkage Subject RIV: CC - Organic Chemistry

  5. Stable dye-labelled oligonucleotide-nanoparticle conjugates for nucleic acid detection

    Barrett, Lee; Dougan, Jennifer A.; Faulds, Karen; Graham, Duncan

    2011-08-01

    Metallic nanoparticles functionalized with oligonucleotides are used for a number of nucleic acid detection strategies. However, oligonucleotide-nanoparticle conjugates suffer from a lack of stability when exposed to certain conditions associated with DNA detection assays. In this study, we report the synthesis of thiol and thioctic acid-modified oligonucleotide gold nanoparticle (OGNs) conjugates functionalized with a dye label and varying spacer groups. The thioctic acid-modified conjugates exhibit increased stability when treated with dithiothreitol (DTT) compared to the more commonly used thiol modification. When the dye labelled oligonucleotide nanoparticle conjugates are exposed to the same conditions there is a pronounced increase in the stability for both thioctic acid and thiol modified sequences. These results open up the possibility of simply using a dye label to enhance the stability of oligonucleotide-nanoparticle conjugates in DNA detection assays where the enhanced stability of the conjugate system can be advantageous in more complex biological environments.

  6. Preparation and detection of nonradioactive nucleic acid and oligonucleotide

    There is increasing interest worldwide in the development of nucleic acid probes which are detected by nonradioactive means. In the research laboratory, the use of 32P for detection is undoubtedly the method of choice and is likely to remain so for the forseeable future, in spite of the half life of only 14 days for 32P. In the diagnostic laboratory on the other hand, the use of nonradioactive probes has many potential advantages. Perhaps the major one is that nonradioactive probes are stable for at least 6 to 12 months, and probably much longer if properly stored, thus leading to a substantial reduction in cost by obviating the need to prepare them every 2 to 3 weeks. In addition, there is no radiation exposure from routine daily use and there are no storage and disposal problems. Numerous methods are described in this chapter for the preparation by enzymatic and chemical techniques of nonradioactive nucleic acid and oligonucleotide probes. In many cases, the resulting probes have yet to be fully tested under hybridization conditions. In others, initial results look very promising since some nonradioactive probes can provide a sensitivity of detection of target sequences similar to that provided by 32P-labeled probes

  7. Reversing multidrug resistance in Caco-2 by silencing MDR1, MRP1, MRP2, and BCL-2/BCL-xL using liposomal antisense oligonucleotides.

    Yu-Li Lo

    Full Text Available Multidrug resistance (MDR is a major impediment to chemotherapy. In the present study, we designed antisense oligonucleotides (ASOs against MDR1, MDR-associated protein (MRP1, MRP2, and/or BCL-2/BCL-xL to reverse MDR transporters and induce apoptosis, respectively. The cationic liposomes (100 nm composed of N-[1-(2,3-dioleyloxypropyl]-n,n,n-trimethylammonium chloride and dioleoyl phosphotidylethanolamine core surrounded by a polyethylene glycol (PEG shell were prepared to carry ASOs and/or epirubicin, an antineoplastic agent. We aimed to simultaneously suppress efflux pumps, provoke apoptosis, and enhance the chemosensitivity of human colon adenocarcinoma Caco-2 cells to epirubicin. We evaluated encapsulation efficiency, particle size, cytotoxicity, intracellular accumulation, mRNA levels, cell cycle distribution, and caspase activity of these formulations. We found that PEGylated liposomal ASOs significantly reduced Caco-2 cell viability and thus intensified epirubicin-mediated apoptosis. These formulations also decreased the MDR1 promoter activity levels and enhanced the intracellular retention of epirubicin in Caco-2 cells. Epirubicin and ASOs in PEGylated liposomes remarkably decreased mRNA expression levels of human MDR1, MRP1, MRP2, and BCL-2. The combined treatments all significantly increased the mRNA expressions of p53 and BAX, and activity levels of caspase-3, -8, and -9. The formulation of epirubicin and ASOs targeting both pump resistance of MDR1, MRP1, and MRP2 and nonpump resistance of BCL-2/BCL-xL demonstrated more superior effect to all the other formulations used in this study. Our results provide a novel insight into the mechanisms by which PEGylated liposomal ASOs against both resistance types act as activators to epirubicin-induced apoptosis through suppressing MDR1, MRP1, and MRP2, as well as triggering intrinsic mitochondrial and extrinsic death receptor pathways. The complicated regulation of MDR highlights the necessity

  8. Enhancement of Blood–Brain Barrier Permeability and Delivery of Antisense Oligonucleotides or Plasmid DNA to the Brain by the Combination of Bubble Liposomes and High-Intensity Focused Ultrasound

    Yoichi Negishi

    2015-09-01

    Full Text Available The blood–brain barrier (BBB is a major obstacle that prevents therapeutic drugs or genes from being delivered to the central nervous system. Therefore, it is important to develop methods to enhance the permeability of the BBB. We have developed echo-contrast gas (C3F8 entrapping liposomes (Bubble liposomes, BLs that can work as a gene delivery tool in combination with ultrasound (US exposure. Here, we studied whether the permeability of the BBB can be enhanced by the combination of BLs and high-intensity focused ultrasound (HIFU. Mice were intravenously injected with Evans blue (EB. BLs were subsequently injected, and the right hemispheres were exposed to HIFU. As a result, the accumulation of EB in the HIFU-exposed brain hemispheres was increased over that observed in the non-HIFU-exposed hemispheres, depending on the intensity and the duration of the HIFU. Similarly, the combination of BLs and HIFU allowed fluorescent-labeled antisense oligonucleotides to be delivered into the HIFU-exposed left hemispheres of the treated mice. Furthermore, a firefly luciferase-expressing plasmid DNA was delivered to the brain by the combination method of BLs and HIFU, which resulted in the increased gene expression in the brain at the focused-US exposure site. These results suggest that the method of combining BLs and HIFU together serves as a useful means for accelerating the permeability of BBB and thereby enabling antisense oligonucleotides or genes to be delivered to the focused brain site.

  9. Exploiting Protected Maleimides to Modify Oligonucleotides, Peptides and Peptide Nucleic Acids

    Clément Paris

    2015-04-01

    Full Text Available This manuscript reviews the possibilities offered by 2,5-dimethylfuran-protected maleimides. Suitably derivatized building blocks incorporating the exo Diels-Alder cycloadduct can be introduced at any position of oligonucleotides, peptide nucleic acids, peptides and peptoids, making use of standard solid-phase procedures. Maleimide deprotection takes place upon heating, which can be followed by either Michael-type or Diels-Alder click conjugation reactions. However, the one-pot procedure in which maleimide deprotection and conjugation are simultaneously carried out provides the target conjugate more quickly and, more importantly, in better yield. This procedure is compatible with conjugates involving oligonucleotides, peptides and peptide nucleic acids. A variety of cyclic peptides and oligonucleotides can be obtained from peptide and oligonucleotide precursors incorporating protected maleimides and thiols.

  10. Structural compatibility of novel nucleotide modifications with shortened linkages designed for antigene/antisense therapy

    Hanuš, J.; Němeček, D.; Štěpánek, J.; Turpin, P. Y.; Králíková, Šárka; Bok, J.; Rosenberg, Ivan

    2004-01-01

    Roč. 35, - (2004), s. 418-425. ISSN 0377-0486 R&D Projects: GA ČR GA203/01/1166 Institutional research plan: CEZ:AV0Z4055905 Keywords : nucleic acid * oligonucleotide * antisense Subject RIV: CC - Organic Chemistry Impact factor: 1.996, year: 2004

  11. Design and synthesis of polyacrylamide-based oligonucleotide supports for use in nucleic acid diagnostics.

    Fahy, E.; Davis, G R; DiMichele, L J; Ghosh, S. S.

    1993-01-01

    Polyacrylamide supports, in a range of pore sizes, were investigated as nucleic acid affinity matrices for the detection of target DNA or RNA sequences using a sandwich hybridization format. Bromoacetyl and thiol oligonucleotide derivatives were covalently linked to sulfhydryl- and bromoacetyl-polyacrylamide supports with greater than 95% end-attachment efficiencies. These polyacrylamide-oligonucleotide supports were further derivatized with anionic residues to provide multi-functional suppor...

  12. Challenges to oligonucleotides-based therapeutics for Duchenne muscular dystrophy

    Goyenvalle Aurélie

    2011-02-01

    Full Text Available Abstract Antisense oligonucleotides are short nucleic acids designed to bind to specific messenger RNAs in order to modulate splicing patterns or inhibit protein translation. As such, they represent promising therapeutic tools for many disorders and have been actively developed for more than 20 years as a form of molecular medicine. Although significant progress has been made in developing these agents as drugs, they are yet not recognized as effective therapeutics and several hurdles remain to be overcome. Within the last few years, however, the prospect of successful oligonucleotides-based therapies has moved a step closer, in particular for Duchenne muscular dystrophy. Clinical trials have recently been conducted for this myopathy, where exon skipping is being used to achieve therapeutic outcomes. In this review, the recent developments and clinical trials using antisense oligonucleotides for Duchenne muscular dystrophy are discussed, with emphasis on the challenges ahead for this type of therapy, especially with regards to delivery and regulatory issues.

  13. Ultramild protein-mediated click chemistry creates efficient oligonucleotide probes for targeting and detecting nucleic acids

    Nåbo, Lina J.; Madsen, Charlotte Stahl; Jensen, Knud Jørgen;

    2015-01-01

    Functionalized synthetic oligonucleotides are finding growing applications in research, clinical studies, and therapy. However, it is not easy to prepare them in a biocompatible and highly efficient manner. We report a new strategy to synthesize oligonucleotides with promising nucleic acid...... targeting and detection properties. We focus in particular on the pH sensitivity of these new probes and their high target specificity. For the first time, human copper(I)-binding chaperon Cox17 was applied to effectively catalyze click labeling of oligonucleotides. This was performed under ultramild...... conditions with fluorophore, peptide, and carbohydrate azide derivatives. In thermal denaturation studies, the modified probes showed specific binding to complementary DNA and RNA targets. Finally, we demonstrated the pH sensitivity of the new rhodamine-based fluorescent probes in vitro and rationalize our...

  14. Cationic polyelectrolyte-mediated delivery of antisense morpholino oligonucleotides for exon-skipping in vitro and in mdx mice

    Wang, Mingxing

    2015-01-01

    Mingxing Wang, Bo Wu, Jason D Tucker, Peijuan Lu, Qilong Lu Department of Neurology, McColl-Lockwood Laboratory for Muscular Dystrophy Research, Cannon Research Center, Carolinas Medical Center, Charlotte, NC, USA Abstract: In this study, we investigated a series of cationic polyelectrolytes (PEs) with different size and composition for their potential to improve delivery of an antisense phosphorodiamidate morpholino oligomer (PMO) both in vitro and in vivo. The results showed that...

  15. Cationic polyelectrolyte-mediated delivery of antisense morpholino oligonucleotides for exon-skipping in vitro and in mdx mice

    Wang M; Wu B; Tucker JD; Lu P; Lu Q

    2015-01-01

    Mingxing Wang, Bo Wu, Jason D Tucker, Peijuan Lu, Qilong Lu Department of Neurology, McColl-Lockwood Laboratory for Muscular Dystrophy Research, Cannon Research Center, Carolinas Medical Center, Charlotte, NC, USA Abstract: In this study, we investigated a series of cationic polyelectrolytes (PEs) with different size and composition for their potential to improve delivery of an antisense phosphorodiamidate morpholino oligomer (PMO) both in vitro and in vivo. The results showed that the...

  16. Amino acids attached to 2'-amino-LNA: Synthesis of DNA mixmer oligonucleotides with increased duplex stability

    Johannsen, Marie Willaing; Wengel, Jesper; Wamberg, Michael Chr.;

    2010-01-01

    The synthesis of 2'-amino-LNA (locked nucleic acid) opens up exciting possibilities for modification of nucleic acids by conjugation to the 2'-nitrogen. Incorporation of unmodified and N-functionalized 2'-amino-LNA nucleotides improve duplex stability compared to unmodified DNA. 2'-Amino......-LNA nucleosides derivatized with amino acids have been synthesized and incorporated into DNA oligonucleotides. Following oligonucleotide synthesis, peptides have been added using solid phase peptide coupling chem. Modification of oligonucleotides with pos. charged residues greatly improves thermal stability....

  17. Poly(ester amine) Composed of Polyethylenimine and Pluronic Enhance Delivery of Antisense Oligonucleotides In Vitro and in Dystrophic mdx Mice.

    Wang, Mingxing; Wu, Bo; Tucker, Jason D; Bollinger, Lauren E; Lu, Peijuan; Lu, Qilong

    2016-01-01

    A series of poly(esteramine)s (PEAs) constructed from low molecular weight polyethyleneimine (LPEI) and Pluronic were evaluated for the delivery of antisense oligonuclotides (AOs), 2'-O-methyl phosphorothioate RNA (2'-OMePS) and phosphorodiamidate morpholino oligomer (PMO) in cell culture and dystrophic mdx mice. Improved exon-skipping efficiency of both 2'-OMePS and PMO was observed in the C2C12E50 cell line with all PEA polymers compared with PEI 25k or LF-2k. The degree of efficiency was found in the order of PEA 01, PEA 04 > PEA 05 > others. The in vivo study in mdx mice demonstrated enhanced exon-skipping of 2'-OMePS with the order of PEA 06 > PEA 04, PEA 07 > PEA 03 > PEA 01 > others, and much higher than PEI 25k formulated 2'-OMePS. Exon-skipping efficiency of PMO in formulation with the PEAs were significantly enhanced in the order of PEA 02 > PEA 10 > PEA 01, PEA 03 > PEA 05, PEA 07, PEA 08 > others, with PEA 02 reaching fourfold of Endo-porter formulated PMO. PEAs improve PMO delivery more effectively than 2'-OMePS delivery in vivo, and the systemic delivery evaluation further highlight the efficiency of PEA for PMO delivery in all skeletal muscle. The results suggest that the flexibility of PEA polymers could be explored for delivery of different AO chemistries, especially for antisense therapy. PMID:27483024

  18. Use of locked nucleic acid oligonucleotides to add functionality to plasmid DNA

    Hertoghs, Kirsten M. L.; Ellis, Jonathan H.; Catchpole, Ian R.

    2003-01-01

    The available reagents for the attachment of functional moieties to plasmid DNA are limiting. Most reagents bind plasmid DNA in a non-sequence- specific manner, with undefined stoichiometry, and affect DNA charge and delivery properties or involve chemical modifications that abolish gene expression. The design and ability of oligonucleotides (ODNs) containing locked nucleic acids (LNAs) to bind supercoiled, double-stranded plasmid DNA in a sequence-specific manner are described for the first ...

  19. Locked nucleic acid

    Jepsen, Jan Stenvang; Sørensen, Mads D; Wengel, Jesper;

    2004-01-01

    Locked nucleic acid (LNA) is a class of nucleic acid analogs possessing very high affinity and excellent specificity toward complementary DNA and RNA, and LNA oligonucleotides have been applied as antisense molecules both in vitro and in vivo. In this review, we briefly describe the basic...

  20. Overexpression of members of the AP-1 transcriptional factor family from an early stage of renal carcinogenesis and inhibition of cell growth by AP-1 gene antisense oligonucleotides in the Tsc2 gene mutant (Eker) rat model.

    Urakami, S; Tsuchiya, H; Orimoto, K; Kobayashi, T; Igawa, M; Hino, O

    1997-12-01

    We previously isolated subtracted cDNA clones for genes having increased expression in Tsc2 gene mutant (Eker) rat renal carcinomas (RCs). Among them, fra-1 encoding a transcriptional factor activator protein 1 (AP-1) was identified. We have therefore investigated whether other members of the AP-1 transcription factor family might also be involved in renal carcinogenesis in the Eker rat model. In the present study, overexpression of fra-1, fra-2, c-jun, junB, and junD mRNAs was demonstrated in RCs by Northern blot analysis. Interestingly, AP-1 proteins were highly expressed even in the earliest preneoplastic lesions (e.g., phenotypically altered tubules) as suggested by immunohistochemistry. Moreover, 12-O-tetradecanoylphorbol-13-acetate-responsive element (TRE)-binding activity of AP-1 proteins was observed in RC cell extracts by electrophoretic mobility shift assay. As a next step, we transfected antisense oligonucleotides targeting AP-1 genes into RC cells and demonstrated that their growth was strongly inhibited. Thus, the data suggest that overexpression of AP-1 genes might play a crucial role in renal carcinogenesis in the Eker rat model. PMID:9405228

  1. Morpholinos: Antisense and Sensibility.

    Blum, Martin; De Robertis, Edward M; Wallingford, John B; Niehrs, Christof

    2015-10-26

    For over 15 years, antisense morpholino oligonucleotides (MOs) have allowed developmental biologists to make key discoveries regarding developmental mechanisms in numerous model organisms. Recently, serious concerns have been raised as to the specificity of MO effects, and it has been recommended to discontinue their usage, despite the long experience of the scientific community with the MO tool in thousands of studies. Reviewing the many advantages afforded by MOs, we conclude that adequately controlled MOs should continue to be accepted as generic loss-of-function approach, as otherwise progress in developmental biology will greatly suffer. PMID:26506304

  2. Cell number and transfection volume dependent peptide nucleic acid antisense activity by cationic delivery methods

    Llovera Nadal, Laia; Berthold, Peter; Nielsen, Peter E;

    2012-01-01

    have now quantitatively compared the cellular activity (in the pLuc705 HeLa cell splice correction system) of PNA antisense oligomers using lipoplex delivery of cholesterol- and bisphosphonate-PNA conjugates, polyplex delivery via a PNA-polyethyleneimine conjugate and CPP delivery via a PNA...

  3. [Study toward practical use of oligonucleotide therapeutics].

    Inoue, Takao; Yoshida, Tokuyuki

    2014-01-01

    Over the past decade, oligonucleotide-based therapeutics such as antisense oligonucleotides and small interfering RNAs (siRNAs) have been developed extensively. For example, mipomersen (Kynamro; ISIS Pharmaceuticals), which is a second-generation antisense oligonucleotide administered by subcutaneous injection, has recently been approved by the FDA for the treatment of homozygous familial hypercholesterolemia. On the other hands, methods for the evaluation of quality, efficacy and safety of oligonucleotide therapeutics have not been fully discussed. Furthermore, the regulatory guidance specific for oligonucleotide therapeutics has not been established yet. Under these circumstances, we started to collaborate with Osaka University and PMDA to discuss regulatory science focused on oligonucleotide therapeutics. Through the collaboration, we would like to propose the possible design of quality evaluation and preclinical safety-evaluation of oligonucleotide therapeutics. PMID:25707197

  4. Improved cellular uptake of antisense Peptide nucleic acids by conjugation to a cell-penetrating Peptide and a lipid domain

    Shiraishi, Takehiko; Nielsen, Peter E

    2011-01-01

    peptides known as cell-penetrating peptides (CPPs) is attracting wide attention for a variety of biologically active molecules. CPP-mediated delivery is typically based on the covalent conjugation of the (therapeutic) cargo to CPPs, and is particularly relevant for the delivery of noncharged RNA...... interference agents such as peptide nucleic acids (PNAs) and morpholino oligomers. Although chemical conjugation to a variety of CPPs significantly improves the cellular uptake of PNAs, the bioavailability (and hence antisense activity) of CPP-PNA -conjugates is still highly limited by endocytotic entrapment...

  5. Determination of antisense phosphorothioate oligonucleotides and catabolites in biological fluids and tissue extracts using anion-exchange high-performance liquid chromatography and capillary gel electrophoresis.

    Chen, S H; Qian, M; Brennan, J M; Gallo, J M

    1997-04-25

    Chemically modified phosphorothioate oligodeoxynucleotides (ODNs) have become critical tools for research in the fields of gene expression and experimental therapeutics. Bioanalytical assays were developed that utilized fast anion-exchange high-performance liquid chromatography (HPLC) and capillary gel electrophoresis (CGE) for the determination of 20-mer ODNs in biological fluids (plasma and urine) and tissues. A 20 mer ODN in the antisense orientation directed against DNA methyltransferase (denoted as MT-AS) was studied as the model ODN. The anion-exchange HPLC method employed a short column packed with non-porous polymer support and a ternary gradient elution with 2 M lithium bromide containing 30% formamide. Analysis of the MT-AS is accomplished within 5 min with a detection limit of approximately 3 ng on-column at 267 nm. For plasma and urine, samples were diluted with Nonidet P-40 in 0.9% NaCl and directly injected onto the column, resulting in 100% recovery. For tissue homogenates, a protein kinase K digestion and phenol-chloroform extraction were used, with an average recovery of about 50%. Since the HPLC assay cannot provide one-base separation, biological samples were also processed by an anion-exchange solid-phase extraction and a CGE method to characterize MT-AS and its catabolites of 15-20-mer, species most relevant to biological activity. One base separation, under an electric field of 400 V/cm at room temperature, was achieved for a mixture of 15-20-mer with about 50 pg injected. Assay validation studies revealed that the combined HPLC-CGE methods are accurate, reproducible and specific for the determination of MT-AS and its catabolites in biological fluids and tissue homogenates, and can be used for the pharmacokinetic characterization of MT-AS. PMID:9187382

  6. Optimal design of parallel triplex forming oligonucleotides containing Twisted Intercalating Nucleic Acids--TINA

    Schneider, Uffe V; Mikkelsen, Nikolaj D; Jøhnk, Nina;

    2010-01-01

    Twisted intercalating nucleic acid (TINA) is a novel intercalator and stabilizer of Hoogsteen type parallel triplex formations (PT). Specific design rules for position of TINA in triplex forming oligonucleotides (TFOs) have not previously been presented. We describe a complete collection of easy...... on PT is remarkably high (between 7.4 and 15.2 degrees C) compared to antiparallel duplexes (between 3.8 and 9.4 degrees C). The specificity of PT by Delta T(m) increases when shorter TFOs and higher pH are chosen. To increase Delta Tms, base mismatches should be placed in the center of the TFO and...

  7. Different effects of antisense RelA p65 and NF-κB1 p50 oligonucleotides on the nuclear factor-κB mediated expression of ICAM-1 in human coronary endothelial and smooth muscle cells

    Both Anton

    2001-08-01

    Full Text Available Abstract Background Activation of nuclear factor-κB (NF-κB is one of the key events in early atherosclerosis and restenosis. We hypothesized that tumor necrosis factor-α (TNF-α induced and NF-κB mediated expression of intercellular adhesion molecule-1 (ICAM-1 can be inhibited by antisense RelA p65 and NF-κB1 p50 oligonucleotides (RelA p65 and NF-κB1 p50. Results Smooth muscle cells (SMC from human coronary plaque material (HCPSMC, plaque material of 52 patients, SMC from the human coronary media (HCMSMC, human endothelial cells (EC from umbilical veins (HUVEC, and human coronary EC (HCAEC were successfully isolated (HCPSMC, HUVEC, identified and cultured (HCPSMC, HCMSMC, HUVEC, HCAEC. 12 hrs prior to TNF-α stimulus (20 ng/mL, 6 hrs RelA p65 and NF-κB1 p50 (1, 2, 4, 10, 20, and 30 μM and controls were added for a period of 18 hrs. In HUVEC and HCAEC there was a dose dependent inhibition of ICAM-1 expression after adding of both RelA p65 and NF-κB1 p50. No inhibitory effect was seen after incubation of HCMSMC with RelA p65 and NF-κB1 p50. A moderate inhibition of ICAM-1 expression was found after simultaneous addition of RelA p65 and NF-κB1 p50 to HCPSMC, no inhibitory effect was detected after individual addition of RelA p65 and NF-κB1 p50. Conclusions The data point out that differences exist in the NF-κB mediated expression of ICAM-1 between EC and SMC. Experimental antisense strategies directed against RelA p65 and NF-κB1 p50 in early atherosclerosis and restenosis are promising in HCAEC but will be confronted with redundant pathways in HCMSMC and HCPSMC.

  8. Combination of telomerase antisense oligonucleotides simultaneously targeting hTR and hTERT produces synergism of inhibition of telomerase activity and growth in human colon cancer cell line

    Xiao-Hua Fu; Jian-Song Zhang; Na Zhang; Yang-De Zhang

    2005-01-01

    AIM: To investigate synergism of inhibition of telomerase activity and proliferation of human colon cancer cells by combination of telomerase antisense oligonucleotides (ASODNs) simultaneously targeting human telomerase RNA (hTR) and human telomerase reverse transcriptase (hTERT)in vitro.METHODS: ASODN of hTR and ASODN of hTERT were transfected into human colon cancer SW480 cells by liposomal transfection reagents. Telomerase activity of SW480 cells was examined using telomeric repeat amplification protocol (TRAP)-enzyme-linked immunosorbent assay (PCR-ELISA). Proliferation activity of SW480 cells was tested by methyl thiazolyl tetrazolium assay. Apoptosis and cell cycle were analyzed by flow cytometry.RESULTS: The telomerase activity and cell survival rate in SW480 cells transfected with 0.2 μmol/L of ASODN of hTR or ASODN of hTERT for 24-72 h were significantly decreased in a time-dependent manner compared with those after treatment with sense oligonucleotides and untreated (telomerase activity: 24 h, 73%, 74% vs 99%,98%; 48 h, 61%, 55% vs 98%, 99%; 72 h, 41%, 37% vs 99%, 97%; P<0.01; cell survival rate: 24 h, 88%, 86%vs94%, 98%; 48 h, 49%, 47% vs94%, 97%; 72 h, 44%,42% vs 92%, 96%; P<0.01). Moreover, the telomerase activity and the cell survival rate in SW480 cells treated by the combination of telomerase anti-hTR and anti-hTERT were more significantly suppressed than single anti-hTR or anti-hTERT (telomerase activity: 24 h, 59% vs 73%,74%; 48 h, 43% vs61%, 55%; 72 h, 18% vs41%, 37%;P<0.01; cell survival rate: 24 h, 64% vs88%, 86%; 48 h,37% vs49%, 47%; 72 h, 25% vs44%, 42%; P<0.01).Meanwhile, the apoptosis rates in the combination group were markedly increased compared with those in the single group (24 h, 18.0% vs 7.2%, 7.4%; 48 h, 23.0%vs 13.0%, 14.0%; 72 h, 28.6% vs13.2%, 13.75; P<0.01).Cells in combination group were arrested at G0/G1 phase.CONCLUSION: Telomerase anti-hRT and anti-hTERT suppress telomerase activity, and inhibit growth of human

  9. Improved cellular activity of antisense peptide nucleic acids by conjugation to a cationic peptide-lipid (CatLip) domain

    Koppelhus, Uffe; Shiraishi, Takehiko; Zachar, Vladimir; Pankratova, Stanislava; Nielsen, Peter E

    2008-01-01

    and therefore mechanisms that promote endosomal escape (or avoid the endosomal route) are required for improving bioavailability. A variety of auxiliary agents (chloroquine, calcium ions, or lipophilic photosensitizers) has this effect, but improved, unaided delivery would be highly advantageous in...... particular for future in vivo applications. We find that simply conjugating a lipid domain (fatty acid) to the cationic peptide (a CatLip conjugate) increases the biological effect of the corresponding PNA (CatLip) conjugates in a luciferase cellular antisense assay up to 2 orders of magnitude. The effect...... increases with increasing length of the fatty acid (C8-C16) but in parallel also results in increased cellular toxicity, with decanoic acid being optimal. Furthermore, the relative enhancement is significantly higher for Tat peptide compared to oligoarginine. Confocal microscopy and chloroquine enhancement...

  10. Cellular delivery and antisense effects of peptide nucleic acid conjugated to polyethyleneimine via disulfide linkers

    Berthold, Peter R; Shiraishi, Takehiko; Nielsen, Peter E

    2010-01-01

    moiety) and further reacted this with a cysteine PNA. The level of modification was determined spectrophotometrically with high accuracy, and the PNA transfection efficiency of the conjugates was evaluated in an antisense luciferase splice-correction assay using HeLa pLuc705 cells. We find that PEI....... Finally, the method can be easily modified to allow for co-conjugation of other small molecules in a high-throughput screening assay that does not require a purification step....

  11. Progress toward therapy with antisense-mediated splicing modulation

    Du, Liutao; Gatti, Richard A.

    2009-01-01

    Antisense oligonucleotides (AO) or antisense RNA can complementarily bind to a target site in pre-mRNA and regulate gene splicing, either to restore gene function by reprogramming gene splicing or to inhibit gene expression by disrupting splicing. These two applications represent novel therapeutic strategies for several types of diseases such as genetic disorders, cancers and infectious diseases. In this review, the recent developments and applications of antisense-mediated splicing modulatio...

  12. Characterization of peptide-oligonucleotide heteroconjugates by mass spectrometry.

    Jensen, O N; Kulkarni, S; Aldrich, J V; Barofsky, D F

    1996-01-01

    Two peptide-oligothymidylic acids, prepared by joining an 11 residue synthetic peptide containing one internal carboxyl group (Asp side chain) to amino-linker-5'pdT6 and amino-linker-5'pdT10 oligonucleotides, were analyzed by matrix-assisted laser desorption/ionization (MALDI) on a linear time-of-flight mass spectrometer and by electrospray ionization (ESI) on a triple-quadrupole system. These synthetic compounds model peptide-nucleic acid heteroconjugates encountered in antisense research an...

  13. Antisense-mediated suppression of C-hordein biosynthesis in the barley grain results in correlated changes in the transcriptome, protein profile, and amino acid composition

    Hansen, Mette; Lange, Marianne; Friis, Carsten;

    2007-01-01

    Antisense- or RNAi-mediated suppression of the biosynthesis of nutritionally inferior storage proteins is a promising strategy for improving the amino acid profile of seeds. However, the potential pleiotropic effects of this on interconnected pathways and the agronomic quality traits need to be...

  14. Modulation of tumor eIF4E by antisense inhibition: A phase I/II translational clinical trial of ISIS 183750-an antisense oligonucleotide against eIF4E-in combination with irinotecan in solid tumors and irinotecan-refractory colorectal cancer.

    Duffy, A G; Makarova-Rusher, O V; Ulahannan, S V; Rahma, O E; Fioravanti, S; Walker, M; Abdullah, S; Raffeld, M; Anderson, V; Abi-Jaoudeh, N; Levy, E; Wood, B J; Lee, S; Tomita, Y; Trepel, J B; Steinberg, S M; Revenko, A S; MacLeod, A R; Peer, C J; Figg, W D; Greten, T F

    2016-10-01

    The eukaryotic translation initiation factor 4E (eIF4E) is a potent oncogene that is found to be dysregulated in 30% of human cancer, including colorectal carcinogenesis (CRC). ISIS 183750 is a second-generation antisense oligonucleotide (ASO) designed to inhibit the production of the eIF4E protein. In preclinical studies we found that EIF4e ASOs reduced expression of EIF4e mRNA and inhibited proliferation of colorectal carcinoma cells. An additive antiproliferative effect was observed in combination with irinotecan. We then performed a clinical trial evaluating this combination in patients with refractory cancer. No dose-limiting toxicities were seen but based on pharmacokinetic data and tolerability the dose of irinotecan was reduced to 160 mg/m(2) biweekly. Efficacy was evaluated in 15 patients with irinotecan-refractory colorectal cancer. The median time of disease control was 22.1 weeks. After ISIS 183750 treatment, peripheral blood levels of eIF4E mRNA were decreased in 13 of 19 patients. Matched pre- and posttreatment tumor biopsies showed decreased eIF4E mRNA levels in five of nine patients. In tumor tissue, the intracellular and stromal presence of ISIS 183750 was detected by IHC in all biopsied patients. Although there were no objective responses stable disease was seen in seven of 15 (47%) patients who were progressing before study entry, six of whom were stable at the time of the week 16 CT scan. We were also able to confirm through mandatory pre- and posttherapy tumor biopsies penetration of the ASO into the site of metastasis. PMID:27194579

  15. 联合VEGF反义寡核苷酸和PDGF三链形成寡核苷酸抑制大鼠脑胶质瘤生长%Triplex forming oligonucleotide of PDGF-B chain combined with antisense oligonucleotide of VEGF inhibits glioma growth in rats

    李维方; 周定标; 余新光; 金由辛

    2006-01-01

    目的:观察血小板源生长因子(PDGF) B链基因(PDGF-B)的三链形成寡核苷酸(triplex forming oligonucleotide,TFO)PDGF-TFO和血管内皮生长因子(VEGF)反义寡核苷酸(antisense oligonucleotide,AON)VEGF-AON对大鼠脑胶质瘤生长的抑制作用.方法:36只雄性SD大鼠,分为4组,所有大鼠均在立体定向导引下行右尾状核区微量灌注含1×106 C6胶质瘤细胞的生理盐水20 μl.在细胞接种后第8天,实验Ⅰ组6只大鼠原位注射含PDGF-TFO 1.5 mg的 20 μl生理盐水,实验Ⅱ组12只和实验Ⅲ组12只大鼠则分别原位注射含PDGF-TFO 1.5 mg+VEGF-AON 0.125 mg和PDGF-TFO 1.5 mg+VEGF-AON 0.25 mg的20 μl生理盐水.以后每隔72 h原位注射相同剂量的药物1次,共注射3次.对照组6只大鼠仅在相同时间原位注射20 μl生理盐水.实验3周时处死所有大鼠,观察肿瘤的生长情况,定性和定量观察肿瘤PDGF-B、VEGF和肿瘤核增殖抗原(PCNA)表达.结果:实验Ⅰ组的成瘤抑制率为53.1 %,实验Ⅱ组为81.4 %,实验Ⅲ组为93.1 %,3组比较有明显差异(P<0.01).PDGF-TFO对C6胶质瘤细胞PDGF-B、VEGF、PCNA表达有明显的抑制作用;联合应用PDGF-TFO和VEGF-AON能更好地抑制PDGF-B、VEGF、PCNA表达.结论:联合应用PDGF-TFO和VEGF-AON 比单用PFGF-TFO能更有效地抑制肿瘤生长.

  16. Antisense approaches in prostate cancer.

    Chi, Kim N; Gleave, Martin E

    2004-06-01

    Patients with hormone refractory prostate cancer have limited treatment options and new therapies are urgently needed. Advances in the understanding of the molecular mechanisms implicated in prostate cancer progression have identified many potential therapeutic gene targets that are involved in apoptosis, growth factors, cell signalling and the androgen receptor (AR). Antisense oligonucleotides are short sequences of synthetic modified DNA that are designed to be complimentary to a selected gene's mRNA and thereby specifically inhibit expression of that gene. The antisense approach continues to hold promise as a therapeutic modality to target genes involved in cancer progression, especially those in which the gene products are not amenable to small molecule inhibition or antibodies. The current status and future direction of a number of antisense oligonucleotides targeting several genes, including BCL-2, BCL-XL, clusterin, the inhibitors of apoptosis (IAP) family, MDM2, protein kinase C-alpha, c-raf, insulin-like growth factor binding proteins and the AR, that have potential clinical use in prostate cancer are reviewed. PMID:15174974

  17. Mass spectrometry of nucleic acids components. Nucleotides, oligonucleotides and application to sequence determination

    The application of the various ionization techniques to the analysis of nucleotides and oligonucleotides is reviewed. The sequence determination of oligonucleotides was chosen to present the growing possibilities of mass spectrometry due to development of new ''soft ionization'' techniques. 119 refs., 6 figs., 2 tabs. (author)

  18. Antisense Oligonucleotide Therapy in Diabetic Retinopathy

    Hnik, Peter; Boyer, David S.; Grillone, Lisa R.; Clement, John G; Henry, Scott P.; Green, Ellen A.

    2009-01-01

    Diabetic retinopathy is one of the leading causes of blindness in the United States and other parts of the world. Historically, laser photocoagulation and vitrectomy surgery have been used for the treatment of diabetic retinopathy, including diabetic macular edema. Both procedures have proven to be useful under certain conditions but have their limitations. New pathways and processes that promote diabetic retinopathy have been identified, and several new therapeutic approaches are under inves...

  19. Application of graphene–pyrenebutyric acid nanocomposite as probe oligonucleotide immobilization platform in a DNA biosensor

    A stable and uniform organic–inorganic nanocomposite that consists of graphene (GR) and pyrenebutyric acid (PBA) was obtained by ultrasonication, which was characterized by scanning electron microscopy (SEM) and UV–vis absorption spectra. The dispersion was dropped onto a gold electrode surface to obtain GR–PBA modified electrode (GR–PBA/Au). Electrochemical behaviors of the modified electrode were characterized by cyclic voltammetry and electrochemical impedance spectroscopy using [Fe(CN)6]3−/4− as the electroactive probe. A novel DNA biosensor was constructed based on the covalent coupling of amino modified oligonucleotides with the carboxylic group on PBA. By using methylene blue (MB) as a redox-active hybridization indicator, the biosensor was applied to electrochemically detect the complementary sequence, and the results suggested that the peak currents of MB showed a good linear relationship with the logarithm values of target DNA concentrations in the range from 1.0 × 10−15 to 5.0 × 10−12 M with a detection limit of 3.8 × 10−16 M. The selectivity experiment also showed that the biosensor can well distinguish the target DNA from the non-complementary sequences. - Highlights: • A nanocomposite containing graphene and pyrenebutyric acid was prepared. • The nanocomposite was applied as a function platform for DNA immobilization platform. • The developed biosensor shows excellent selectivity and sensitivity for target DNA detection

  20. Circular RNA oligonucleotides. Synthesis, nucleic acid binding properties, and a comparison with circular DNAs.

    Wang, S; Kool, E T

    1994-06-25

    We report the synthesis and nucleic acid binding properties of two cyclic RNA oligonucleotides designed to bind single-stranded nucleic acids by pyr.pur.pyr-type triple helix formation. The circular RNAs are 34 nucleotides in size and were cyclized using a template-directed nonenzymatic ligation. To ensure isomeric 3'-5' purity in the ligation reaction, one nucleotide at the ligation site is a 2'-deoxyribose. One circle (1) is complementary to the sequence 5'-A12, and the second (2) is complementary to 5'-AAGAAAGAAAAG. Results of thermal denaturation experiments and mixing studies show that both circles bind complementary single-stranded DNA or RNA substrates by triple helix formation, in which two domains in a pyrimidine-rich circle sandwich a central purine-rich substrate. The affinities of these circles with their purine complements are much higher than the affinities of either the linear precursors or simple Watson-Crick DNA complements. For example, circle 1 binds rA12 (pH 7.0, 10 mM MgCl2, 100 mM NaCl) with a Tm of 48 degrees C and a Kd (37 degrees C) of 4.1 x 10(-9) M, while the linear precursor of the circle binds with a Tm of 34 degrees C and a Kd of 1.2 x 10(-6) M. The complexes of circle 2 are pH-dependent, as expected for triple helical complexes involving C(+)G.C triads, and mixing plots for both circles reveal one-to-one stoichiometry of binding either to RNA or DNA substrates. Comparison of circular RNAs with previously synthesized circular DNA oligonucleotides of the same sequence reveals similar behavior in the binding of DNA, but strikingly different behavior in the binding of RNA. The cyclic DNAs show high DNA-binding selectivity, giving relatively weaker duplex-type binding with complementary RNAs. The relative order of thermodynamic stability for the four types of triplex studied here is found to be DDD > RRR > RDR > DRD. The results are discussed in the context of recent reports of strong triplex dependence on RNA versus DNA backbones. Triplex

  1. Formulation of polylactide-co-glycolic acid nanospheres for encapsulation and sustained release of poly(ethylene imine-poly(ethylene glycol copolymers complexed to oligonucleotides

    Wheatley Margaret A

    2009-04-01

    Full Text Available Abstract Antisense oligonucleotides (AOs have been shown to induce dystrophin expression in muscles cells of patients with Duchenne Muscular Dystrophy (DMD and in the mdx mouse, the murine model of DMD. However, ineffective delivery of AOs limits their therapeutic potential. Copolymers of cationic poly(ethylene imine (PEI and non-ionic poly(ethylene glycol (PEG form stable nanoparticles when complexed with AOs, but the positive surface charge on the resultant PEG-PEI-AO nanoparticles limits their biodistribution. We adapted a modified double emulsion procedure for encapsulating PEG-PEI-AO polyplexes into degradable polylactide-co-glycolic acid (PLGA nanospheres. Formulation parameters were varied including PLGA molecular weight, ester end-capping, and sonication energy/volume. Our results showed successful encapsulation of PEG-PEI-AO within PLGA nanospheres with average diameters ranging from 215 to 240 nm. Encapsulation efficiency ranged from 60 to 100%, and zeta potential measurements confirmed shielding of the PEG-PEI-AO cationic charge. Kinetic measurements of 17 kDa PLGA showed a rapid burst release of about 20% of the PEG-PEI-AO, followed by sustained release of up to 65% over three weeks. To evaluate functionality, PEG-PEI-AO polyplexes were loaded into PLGA nanospheres using an AO that is known to induce dystrophin expression in dystrophic mdx mice. Intramuscular injections of this compound into mdx mice resulted in over 300 dystrophin-positive muscle fibers distributed throughout the muscle cross-sections, approximately 3.4 times greater than for injections of AO alone. We conclude that PLGA nanospheres are effective compounds for the sustained release of PEG-PEI-AO polyplexes in skeletal muscle and concomitant expression of dystrophin, and may have translational potential in treating DMD.

  2. Optimization of the Formulation and Design of Oligonucleotide-based Pharmaceuticals for the Purpose of Gene Therapy

    Zaghloul, Eman M.

    2012-01-01

    Oligonucleotides (ONs) are short sequences of nucleic acids which may be used in a therapeutic context to modulate gene expression. According to their target, ONs can be classified into two main classes: antisense ONs which target mRNA and antigene ONs that target chromosomal DNA. In order to be pharmaceutically efficient, both kinds of ONs have to possess enough stability against degrading enzymes and rapid clearance. They must pass the cell membrane, and in some cases the nuc...

  3. Optimal design of parallel triplex forming oligonucleotides containing Twisted Intercalating Nucleic Acids--TINA.

    Schneider, Uffe V; Mikkelsen, Nikolaj D; Jøhnk, Nina; Okkels, Limei M; Westh, Henrik; Lisby, Gorm

    2010-07-01

    Twisted intercalating nucleic acid (TINA) is a novel intercalator and stabilizer of Hoogsteen type parallel triplex formations (PT). Specific design rules for position of TINA in triplex forming oligonucleotides (TFOs) have not previously been presented. We describe a complete collection of easy and robust design rules based upon more than 2500 melting points (T(m)) determined by FRET. To increase the sensitivity of PT, multiple TINAs should be placed with at least 3 nt in-between or preferable one TINA for each half helixturn and/or whole helixturn. We find that Delta T(m) of base mismatches on PT is remarkably high (between 7.4 and 15.2 degrees C) compared to antiparallel duplexes (between 3.8 and 9.4 degrees C). The specificity of PT by Delta T(m) increases when shorter TFOs and higher pH are chosen. To increase Delta Tms, base mismatches should be placed in the center of the TFO and when feasible, A, C or T to G base mismatches should be avoided. Base mismatches can be neutralized by intercalation of a TINA on each side of the base mismatch and masked by a TINA intercalating direct 3' (preferable) or 5' of it. We predict that TINA stabilized PT will improve the sensitivity and specificity of DNA based clinical diagnostic assays. PMID:20338879

  4. Comparative study on imaging of 99Tcm-survivin mRNA antisense peptide nucleic acid in tumor and inflammation animal models

    Objective: To investigate the value of 99Tcm labeled survivin mRNA antisense peptide nucleic acid (PNA) as an imaging agent in the specific diagnosis for carcinoma. Methods: Survivin mRNA antisense PNA was labeled directly with 99Tcm by the ligand-exchange method. Twenty nude mice with lung carcinoma A549 xenografts were randomly divided into 4 groups. Three groups were used for biodistribution study and one group was used for imaging study. Other twenty mice infected by staphylococcus aureus underwent the same procedure. The biodistribution and imaging of 99Tcm-survivin mRNA antisense PNA was studied at 1, 2 and 4 h respectively after the intravenous injection in nude mice bearing lung carcinoma A549 xenografts or inflammation models. SPSS 13.0 was used in the study and all data were analyzed by t test. Results: Biodistribution results showed that the highest radioactivity was found in the liver,and then in the kidney. Four hours after the administration of the imaging agent, the radioactivity ratios of target-to-non target (T/NT, tumor or inflammatory lesions to the contralateral regions) in tumor model group were significantly higher than those in inflammation model group (3.69 ± 1.13 vs 2.03 ± 0.47, t=3.01, P=0.02). Tumors were clearly visible in the tumor model groups at 0.5 h and still clearly seen at 4 h after the injection of antisense PNA. On the contrary,inflammatory lesions could not be seen clearly. Conclusion: 99Tcm labeled survivin mRNA antisense PNA can be used to distinguish tumor from inflammation and it may provide a new feasible method for specific tumor diagnosis. (authors)

  5. Screening of effective antisense peptide nucleic acids targeting gyrA from multidrug-resistant Acinetobacter baumannii and their antimicrobial effects in vitro%多重耐药鲍曼不动杆菌gyrA基因高效反义肽核酸序列筛选及其体外抗菌活性观察

    王慧娟; 何云燕; 夏云; 王立朋; 梁树梅

    2013-01-01

    Objective To screen the effective antisense peptide nucleic acids targeting gyrA gene from multidrug-resistant Acinetobacter baumannii,and to evaluate their antimicrobial effects in vitro.Methods Two RNA folding computer programs,Mfold and RNA structure 4.6,were used to predict the secondary structure of gyrA mRNA,and then 10 antisense oligonucleotides were designed based on free energy theory.The full length of gyrA mRNA was transcribed in vitro and labeled by digoxigenin-ll-uridine-5'-triphosphate.Dot blothybridization was used to screen the gyrA mRNA accessible sites which showed strong binding affinity to the antisense oligonucleotides.Peptide nucleic acid (PNA) was synthesized based on the sequence of antisense oligonucleotide showing high affinity.Another PNA oligomer containing 6 mismatched nucleotides was used as a negative control.Both the 2 PNAs were conjugated to cell penetrating peptide (CPPs) (KFF)3 K to form peptide-PNA (PPNA).After the bacterial culture was treated with different concentrations of PPNA,OD600 and viable cell counts were measured to evaluate the growth inhibitory effect of the antisense oligonucleotide.Reverse transcript (RT)-PCR was applied to evaluate the level of gyrA expression.Results Of the 10 antisense oligonucleotides,5 showed binding affinity to gyrA mRNA and one of them showed strong binding affinity.PPNA designed based on the oligonucleotide significantly inhibited the growth of the bacterium and gyrA gene expression at a dose of 5 μmol/L,and exhibited anti-bactericidal effect at a dose of l0 μmol/L.Mismatched PPNA had no effect on the bacterial growth.Conclusion Combination of computer-aided prediction with dot blot hybridization is a high-flux and rapid way to screen effective antisense oligonucleotides in vitro.The screened anti-gyrA PPNA exerts significant inhibitory effect on the growth and gene expression in the bacterium in vitro.%目的 筛选出能与多重耐药鲍曼不动杆菌gyrA基因的mRNA紧密结合的

  6. Antisense gene therapy using anti-k-ras and antitelomerase oligonucleotides in colorectal cancer Eficacia de la terapia génica antisentido utilizando oligonucleótidos anti K-ras y antitelomerasa en cáncer colorrectal

    S. Lledó

    2005-07-01

    Full Text Available Aim: to test the efficacy of anti-k-ras and antitelomerase oligonucleotides for disabling colorectal cancer cell growth. Material and methods: an established human colorectal cancer cell line (SW 480, ATTC® was used. Oligodeoxiribonucleotides (ODNs have a phosphorotioate modification to ensure intracellular intake. We used an antitelomerase ODN (Telp5 and two anti-k-ras ODNs (AS-KRAS and ISIS. AS-KRAS is designed to join the k-ras oncogene's exon 1. ISIS links to the terminal transcription unit 5' of k-ras. Telp5 joins the template region of the hTR telomerase subunit. ODNs have been tested in different concentrations (1, 5, 10, 20 micromolar. Cell viability has been tested at 48 and 72 hours. Statistical analysis and graphic design were made with the statistical package "Analyzing Data with GraphPad Prism-1999", GraphPad Sofware Inc., San Diego CA©. We used the Student's t test for statistical analysis. Results: the lowest dose (1 µM was not effective. Using the highest dose (20 mM for 48 hours of combined AS-KRAS and Telp5 cell viability decreased to 99.67%. The rest of results varied depending on ODN type, dose, and exposure time. Conclusions: tested antisense ODNs stop colorectal cancer cell growth, and a combination of anti-telomerase and anti-k-ras is the most useful treatment. Efficacy is best with a higher dose and longer treatment period.Objetivo: evaluar la eficacia de oligonucleótidos anti k-ras y antitelomerasa para detener el crecimiento tumoral en el cáncer colorrectal. Material y métodos: se ha empleado una línea celular establecida de cáncer colorrectal humano (SW 480, ATTC®. Los oligodesoxirribonucleótidos (ODN utilizados en el presente trabajo presentan modificación fosforotioato con el fin de mejorar su estabilidad en presencia de fluidos biológicos. Hemos utilizado un ODN antitelomerasa (Telp5, y dos ODN anti k-ras (AS-KRAS e ISIS. AS-KRAS actúa en el exón 1 e ISIS actúa a nivel de la unidad terminal de

  7. Ligation of oligonucleotides to nucleic acids or proteins via disulfide bonds.

    Chu, B C; Orgel, L E

    1988-01-01

    We have developed general methods for joining together, via cleavable disulfide bonds, either two unprotected polynucleotides or a polynucleotide and a peptide or protein. To join two oligonucleotides, each is first converted to an adduct in which cystamine is joined to the 5'-terminal phosphate of the oligonucleotide by a phosphoramidate bond. The adducts are mixed and reduced with dithiothreitol. The dithiothreitol is then removed by dialysis. Oxidation by atmospheric oxygen occurs to yield...

  8. Protective effect of c-fos antisense oligonucleotides on brain damage induced by glutamate%c-fos反义寡核苷酸对谷氨酸神经毒性鼠脑损伤的防护

    岳少杰; 陶永光; 罗自强; 冯德云; 伍赶球

    2001-01-01

    Objective To investigate the relation between glutamate neurotoxicity and c-fos gene expression. Methods c-fos antisense oligonucleotides (AS ODN) was injected into the right lateral ventricles of 9 SD rats to block the c-fos gene expression in brain tissue. c-fos sense oligonucleotides (S ODN)was used a control. The numbers and morphology of neurons in both cerebral cortex and hippocampal CA1 were detected by MIAS-300 image analysing instrument. c-fos gene expression in brain was observed by immunohistochemical method. The content of water and electrolytes in the brain tissue and Ca2+ in the synapse were measured. Results The c-fos AS ODN blocked the c-fos gene expression and reduced the content of both water and sodium in brain tissue and Ca2+ in symptosome, thus alleviating the morphological damage in neuron. S ODN did not have such effect. Conclusion c-fos gene expression plays an important role in mediating the effect of glutamate neurotoxicity. Blocking the c-fos gene expression could antagonize glutamate neurotoxicity.%目的 探讨c-fos基因的表达在谷氨酸神经毒性中的作用。方法 在9只SD大鼠侧脑室注射c-fos反义寡核苷酸以阻断脑组织c-fos基因的表达,并用c-fos正义寡核苷酸为对照。观察脑组织中水、电解质含量和突触体内Ca2+浓度的变化,并采用细胞形态计量分析及免疫组织化学方法,观察大脑皮质、海马CA1区神经细胞数目、形态的变化及c-fos基因的表达。结果 c-fos反义寡核苷酸可有效地阻断脑组织c-fos基因的表达,降低脑组织c-fos阳性细胞率(9.4%±2.8%和74%±3%,P<0.01),抑制谷氨酸神经毒性所致的脑组织含水量(79.9%±0.4%和82.3%±0.8%,P<0.01)、钠(5.05 mg/g干重±0.39 mg/g干重和5.98 mg/g干重±0.50 mg/g干重,P<0.01)及细胞内Ca2+(176 nmol/L±35 nmol/L和344.12±50.13,P<0.01)含量的增加,抑制谷氨酸所致大脑皮质(157±10和145±7,P<0

  9. Logic gates and antisense DNA devices operating on a translator nucleic Acid scaffold.

    Shlyahovsky, Bella; Li, Yang; Lioubashevski, Oleg; Elbaz, Johann; Willner, Itamar

    2009-07-28

    A series of logic gates, "AND", "OR", and "XOR", are designed using a DNA scaffold that includes four "footholds" on which the logic operations are activated. Two of the footholds represent input-recognition strands, and these are blocked by complementary nucleic acids, whereas the other two footholds are blocked by nucleic acids that include the horseradish peroxidase (HRP)-mimicking DNAzyme sequence. The logic gates are activated by either nucleic acid inputs that hybridize to the respective "footholds", or by low-molecular-weight inputs (adenosine monophosphate or cocaine) that yield the respective aptamer-substrate complexes. This results in the respective translocation of the blocking nucleic acids to the footholds carrying the HRP-mimicking DNAzyme sequence, and the concomitant release of the respective DNAzyme. The released product-strands then self-assemble into the hemin/G-quadruplex-HRP-mimicking DNAzyme that biocatalyzes the formation of a colored product and provides an output signal for the different logic gates. The principle of the logic operation is, then, implemented as a possible paradigm for future nanomedicine. The nucleic acid inputs that bind to the blocked footholds result in the translocation of the blocking nucleic acids to the respective footholds carrying the antithrombin aptamer. The released aptamer inhibits, then, the hydrolytic activity of thrombin. The system demonstrates the regulation of a biocatalytic reaction by a translator system activated on a DNA scaffold. PMID:19507821

  10. Preparation of 99Tcm labeled c-myc mRNA antisense peptide nucleic acid and its biodistribution in tumor-bearing nude mice

    Objective: The aim of this work was to study a 99Tcm labeling method for c-myc mRNA antisense peptide nucleic acid (PNA) fragments and the biodistribution of the labeled product in tumor- beating nude mice. Methods: A four amino acid sequence Gly-(D)-Ala-Gly-Gly [G-(D)-A-G-G] was used as a chelator. N-GAGG-Aba-GCATCGTCGCGG, a chelator-antisense PNA specific for the human c- myc oncogene mRNA initiation region, was synthesized, purified and characterized. N-GAGG-Aba-GCAT- GTCTGCGG, a chelator mismatched PNA, was synthesized and used as a control. G-(D)-A-G-G provided an N4 configuration for strong, efficient chelation of 99Tcm. The labeled PNA was identified with high performance liquid chromatography (HPLC) and the labeling yield and radiochemical purity were measured by paper chromatography. The biodistribution was studied with nude mice bearing colon carcinoma and the percentage activity of injected dose per gram of tissue (%ID/g) was calculated. ASA 6.12 was used for data analysis. Results: The results of HPLC and paper chromatography confirmed that 99Tcm was joined to the PNA or the mismatched PNA with a high radiochemical purity (> 95%). Both were stable in vitro or incubated with human fresh serum and were excreted through urine. Results of biodistribution studies showed that the highest radioactivity levels were in the kidneys and spleen. The radioactivity of 99Tcm labeled antisense PNA in tumor was high whereas that of 99Tcm labeled mismatch PNA was very low [(1.11% ± 0.12)% ID/g and (0.14 ± 0.02)% ID/g, respectively; t=14.75, P99Tcm by the method presented in this paper, with good yield, radiochemical purity and stability. It was an efficient method to label antisense PNA with 99Tcm. The product seemed to be a potential tumor imaging agent. (authors)

  11. Effects of antisense oligonucleotides targeting VEGF on radio sensitivity of uterine cervix cancer Hela cells%血管内皮生长因子反义核酸对宫颈癌Hela细胞的放射增敏作用

    Lina Xing; Li Qi

    2009-01-01

    Objective: To determine the impact of antisense oligonucleotides targeting vascular endothelial growth factor (VEGF) on radiosensitivity of uterine cervix cancer Hela cells. Methods: VEGF antisense oligodeoxynucleotides (ASODN) was transfected into Hela cells by liposome-mediated method. Cells transfected with the oligodeoxynuclecotide and saline were used as control groups. Cells were irradiated by 6 MV X ray at the dose of 0 Gy, 2 Gy, 4 Gy and 6 Gy respectively. The expression of VEGF mRNA was determined by RT-PCR. Apoptosis were evaluated using FCM. Cloning efficiency was deter-mined by colony formation assay. Results: The expression of VEGF mRNA was inhibited by ASODN (P < 0.01) in Hela cells. The inhibited activation which was influenced by radiation resulted in increasing apoptosis (P < 0.01) and inhibiting plating efficiency (P < 0.01). Conclusion: The expression of VEGF induced by Ⅹ irradiation in Hela cells can be blocked by VEGF ASODN. Treatment with VEGF might increase apoptosis in HeLa cells and enhance radiosensitivity.

  12. Functional correction by antisense therapy of a splicing mutation in the GALT gene.

    Coelho, Ana I; Lourenço, Sílvia; Trabuco, Matilde; Silva, Maria João; Oliveira, Anabela; Gaspar, Ana; Diogo, Luísa; Tavares de Almeida, Isabel; Vicente, João B; Rivera, Isabel

    2015-04-01

    In recent years, antisense therapy has emerged as an increasingly important therapeutic approach to tackle several genetic disorders, including inborn errors of metabolism. Intronic mutations activating cryptic splice sites are particularly amenable to antisense therapy, as the canonical splice sites remain intact, thus retaining the potential for restoring constitutive splicing. Mutational analysis of Portuguese galactosemic patients revealed the intronic variation c.820+13A>G as the second most prevalent mutation, strongly suggesting its pathogenicity. The aim of this study was to functionally characterize this intronic variation, to elucidate its pathogenic molecular mechanism(s) and, ultimately, to correct it by antisense therapy. Minigene splicing assays in two distinct cell lines and patients' transcript analyses showed that the mutation activates a cryptic donor splice site, inducing an aberrant splicing of the GALT pre-mRNA, which in turn leads to a frameshift with inclusion of a premature stop codon (p.D274Gfs*17). Functional-structural studies of the recombinant wild-type and truncated GALT showed that the latter is devoid of enzymatic activity and prone to aggregation. Finally, two locked nucleic acid oligonucleotides, designed to specifically recognize the mutation, successfully restored the constitutive splicing, thus establishing a proof of concept for the application of antisense therapy as an alternative strategy for the clearly insufficient dietary treatment in classic galactosemia. PMID:25052314

  13. Immobilization of nucleic acids at solid surfaces: effect of oligonucleotide length on layer assembly.

    Steel, A B; Levicky, R L; Herne, T M; Tarlov, M J

    2000-01-01

    This report investigates the effect of DNA length and the presence of an anchoring group on the assembly of presynthesized oligonucleotides at a gold surface. The work seeks to advance fundamental insight into issues that impact the structure and behavior of surface-immobilized DNA layers, as in, for instance, DNA microarray and biosensor devices. The present study contrasts immobilization of single-stranded DNA (ssDNA) containing a terminal, 5' hexanethiol anchoring group with that of unfunc...

  14. Quantification of syntrophic fatty acid-beta-oxidizing bacteria in a mesophilic biogas reactor by oligonucleotide probe hybridization

    Hansen, K.W.; Ahring, Birgitte Kiær; Raskin, L.

    1999-01-01

    Small-subunit rRNA sequences were obtained for two saturated fatty acid-beta-oxidizing syntrophic bacteria, Syntrophomonas sapovorans and Syntrophomonas wolfei LYE, and sequence analysis confirmed their classification as members of the family Syntrophomonadaceae. S, wolfei LYE was closely related...... to S. wolfei subsp. wolfei, but S. sapovorans did not cluster with the other members of the genus Syntrophomonas, Five oligonucleotide probes targeting the small-subunit rRNA of different groups within the family Syntrophomonadaceae, which contains all currently known saturated fatty acid......-beta-oxidizing syntrophic bacteria, were developed and characterized. The probes were designed to be specific at the family, genus, and species levels and were characterized by temperature of-dissociation and specificity studies, To demonstrate the usefulness of the probes for the detection and quantification of saturated...

  15. hPOT1 antisense-nucieic acids inhibit the proliferation of gastric cancer cell line SGC7901

    帖君

    2006-01-01

    Objective To investigate the effect of hPOT1 (human protection of telomeres,hPOT1) on the growth and proliferation of human gastric cancer cell line SGC7901. Methods The constructed sense and antisense hPOT1 gene eukaryotic expressing vectors were transfected into SGC7901 cells respectively, and positive clones were selected by G418. Changes of hPOT1 protein expression,

  16. Antisense gene therapy using anti-k-ras and antitelomerase oligonucleotides in colorectal cancer Eficacia de la terapia génica antisentido utilizando oligonucleótidos anti K-ras y antitelomerasa en cáncer colorrectal

    S. Lledó; R. Alfonso; Aliño, S.F.

    2005-01-01

    Aim: to test the efficacy of anti-k-ras and antitelomerase oligonucleotides for disabling colorectal cancer cell growth. Material and methods: an established human colorectal cancer cell line (SW 480, ATTC®) was used. Oligodeoxiribonucleotides (ODNs) have a phosphorotioate modification to ensure intracellular intake. We used an antitelomerase ODN (Telp5) and two anti-k-ras ODNs (AS-KRAS and ISIS). AS-KRAS is designed to join the k-ras oncogene's exon 1. ISIS links to the terminal transcriptio...

  17. Antisense mediated exon skipping therapy for duchenne muscular dystrophy (DMD)

    Brolin, Camilla; Shiraishi, Takehiko

    2011-01-01

    Duchenne Muscular Dystrophy (DMD) is a lethal disease caused by mutations in the dystrophin gene (DMD) that result in the absence of essential muscle protein dystrophin. Among many different approaches for DMD treatment, exon skipping, mediated by antisense oligonucleotides, is one of the most...

  18. Enzymatic Synthesis of Modified Oligonucleotides by PEAR Using Phusion and KOD DNA Polymerases

    Wang, Xuxiang; Zhang, Jianye; Li, Yingjia; Chen, Gang; Wang, Xiaolong

    2015-01-01

    Antisense synthetic oligonucleotides have been developed as potential gene-targeted therapeutics. We previously reported polymerase–endonuclease amplification reaction (PEAR) for amplification of natural and 5′-O-(1-thiotriphosphate) (S)-modified oligonucleotides. Here, we extended the PEAR technique for enzymatic preparation of 2′-deoxy-2′-fluoro-(2′-F) and 2′-F/S double-modified oligonucleotides. The result showed that KOD and Phusion DNA polymerase could synthesize oligonucleotides with on...

  19. Efficiency of cellular delivery of antisense peptide nucleic acid by electroporation depends on charge and electroporation geometry

    Joergensen, Mette; Agerholm-Larsen, Birgit; Nielsen, Peter E;

    2011-01-01

    Electroporation is potentially a very powerful technique for both in vitro cellular and in vivo drug delivery, particularly relating to oligonucleotides and their analogs for genetic therapy. Using a sensitive and quantitative HeLa cell luciferase RNA interference mRNA splice correction assay wit...

  20. Peptide-LNA oligonucleotide conjugates

    Astakhova, I Kira; Hansen, Lykke Haastrup; Vester, Birte; Wengel, Jesper

    2013-01-01

    Although peptide-oligonucleotide conjugates (POCs) are well-known for nucleic acids delivery and therapy, reports on internal attachment of peptides to oligonucleotides are limited in number. To develop a convenient route for preparation of internally labeled POCs with improved biomedical...

  1. Oligonucleotide conjugates - Candidates for gene silencing therapeutics.

    Gooding, Matt; Malhotra, Meenakshi; Evans, James C; Darcy, Raphael; O'Driscoll, Caitriona M

    2016-10-01

    The potential therapeutic and diagnostic applications of oligonucleotides (ONs) have attracted great attention in recent years. The capability of ONs to selectively inhibit target genes through antisense and RNA interference mechanisms, without causing un-intended sideeffects has led them to be investigated for various biomedical applications, especially for the treatment of viral diseases and cancer. In recent years, many researchers have focused on enhancing the stability and target specificity of ONs by encapsulating/complexing them with polymers or lipid chains to formulate nanoparticles/nanocomplexes/micelles. Also, chemical modification of nucleic acids has emerged as an alternative to impart stability to ONs against nucleases and other degrading enzymes and proteins found in blood. In addition to chemically modifying the nucleic acids directly, another strategy that has emerged, involves conjugating polymers/peptide/aptamers/antibodies/proteins, preferably to the sense strand (3'end) of siRNAs. Conjugation to the siRNA not only enhances the stability and targeting specificity of the siRNA, but also allows for the development of self-administering siRNA formulations, with a much smaller size than what is usually observed for nanoparticle (∼200nm). This review concentrates mainly on approaches and studies involving ON-conjugates for biomedical applications. PMID:27521696

  2. Effects of MDM2 Antisense Oligonucleotide Combined with Paclitaxel on Human Breast Cancer Cells MCF-7%MDM2反义寡核苷酸联合紫杉醇对乳腺癌MCF-7细胞株的作用

    田国梅; 赵长久; 付鹏; 栾厦; 张月红; 吴琼

    2012-01-01

    Objective: To investigate the effects of the MDM2 antisense oligonucleotide (ASON) combined with Paclitaxel on human breast cancer cells MCF-7. Methods: The synthesis of antisense oligonucleotides specific binding of MDM2 mRNA and missense oligonucleotides(MON) different from four bases, different concentrations of MDM2 ASON mediated by Lipofectamine 2000 transfected MCF-7 breast cancer cell lines, breast cancer cells transfected by 1 μmol/L paclitaxel treatment.The expression of MDM2 mRNA and protein was determined by RT-PCR and Western blotting, To detect synergies of MDM2 ASON combined with paclitaxel and the inhibition efficiency of breast cancer cells MCF-7, the proliferation of MCF-7 cell to paclitaxe and chemosensitivity were observed by MTT assay. Results: The antisense oligonucleotide combined with Paclitaxel efficiently down-regulated MDM2 mRNA and protein expression, inhibit the growth of MCF-7 cells. MDM2 expression was getting lower and lower with the increase of the concentration of MDM2 ASON growing in a dose dependent relationship, the synergy of the A500 combined with paclitaxel was the most obvious. MTT showed that proliferation inhibition rate of MCF-7 cell transfected to pactitaxel increased significantly, A500 was the most significant effect, inhibition rate was (13.0 ± 0.84)%. Conclusion: Human breast cancer cell MCF-7 transfected was treated by a concentration of paclitaxel, MDM2 expression was significantly decreased, increased apoptosis, MDM2 ASON combined with paclitaxel on MCF-7 cells had a syn-ergistic effect, improved the sensitivity of breast cancer MCF-7 cells to paclitaxel.%目的:探讨靶向MDM2反义寡核苷酸(ASON)联合紫杉醇对乳腺癌MCF-7细胞株的影响.方法:合成一段与MDM2 mRNA特异性结合的反义寡核苷酸和与反义寡核苷酸有4个碱基不同的的错义寡核苷酸(MON),脂质体2000介导不同浓度的MDM2ASON转染MCF-7乳腺癌细胞系,转染的乳腺癌细胞通过1μmol/L紫

  3. Stimuli-Responsive Codelivery of Oligonucleotides and Drugs by Self-Assembled Peptide Nanoparticles.

    Sigg, Severin J; Postupalenko, Viktoriia; Duskey, Jason T; Palivan, Cornelia G; Meier, Wolfgang

    2016-03-14

    Ever more emerging combined treatments exploiting synergistic effects of drug combinations demand smart, responsive codelivery carriers to reveal their full potential. In this study, a multifunctional stimuli-responsive amphiphilic peptide was designed and synthesized to self-assemble into nanoparticles capable of co-bearing and -releasing hydrophobic drugs and antisense oligonucleotides for combined therapies. The rational design was based on a hydrophobic l-tryptophan-d-leucine repeating unit derived from a truncated sequence of gramicidin A (gT), to entrap hydrophobic cargo, which is combined with a hydrophilic moiety of histidines to provide electrostatic affinity to nucleotides. Stimuli-responsiveness was implemented by linking the hydrophobic and hydrophilic sequence through an artificial amino acid bearing a disulfide functional group (H3SSgT). Stimuli-responsive peptides self-assembled in spherical nanoparticles in sizes (100-200 nm) generally considered as preferable for drug delivery applications. Responsive peptide nanoparticles revealed notable nucleotide condensing abilities while maintaining the ability to load hydrophobic cargo. The disulfide cleavage site introduced in the peptide sequence induced responsiveness to physiological concentrations of reducing agent, serving to release the incorporated molecules. Furthermore, the peptide nanoparticles, singly loaded or coloaded with boron-dipyrromethene (BODIPY) and/or antisense oligonucleotides, were efficiently taken up by cells. Such amphiphilic peptides that led to noncytotoxic, reduction-responsive nanoparticles capable of codelivering hydrophobic and nucleic acid payloads simultaneously provide potential toward combined treatment strategies to exploit synergistic effects. PMID:26871486

  4. Development of bis-locked nucleic acid (bisLNA) oligonucleotides for efficient invasion of supercoiled duplex DNA

    Moreno, Pedro M D; Geny, Sylvain; Pabon, Y Vladimir;

    2013-01-01

    into duplex DNA (DSI). We thus report on the development of a clamp type of LNA ON-bisLNA-with capacity to bind and invade into supercoiled double-stranded DNA. The bisLNA links a triplex-forming, Hoogsteen-binding, targeting arm with a strand-invading Watson-Crick binding arm. Optimization was carried...... out by varying the number and location of LNA nucleotides and the length of the triplex-forming versus strand-invading arms. Single-strand regions in target duplex DNA were mapped using chemical probing. By combining design and increase in LNA content, it was possible to achieve a 100-fold increase in......In spite of the many developments in synthetic oligonucleotide (ON) chemistry and design, invasion into double-stranded DNA (DSI) under physiological salt and pH conditions remains a challenge. In this work, we provide a new ON tool based on locked nucleic acids (LNAs), designed for strand invasion...

  5. Hydroquinone-O,O'-diacetic acid ('Q-linker') as a replacement for succinyl and oxalyl linker arms in solid phase oligonucleotide synthesis.

    Pon, R T; Yu, S.

    1997-01-01

    When hydroquinone-O,Ooffiacetic acid is used as a linker arm in solid phase oligonucleotide synthesis, the time for NH4OH cleavage of oligodeoxy- or oligoribonucleotides is reduced to only 2 min. This allows increased productivity on automated DNA synthesizers without requiring any other modifications to existing reagents or synthesis and deprotection methods. The Q-linker may also be rapidly cleaved by milder reagents such as 5% NH4OH, potassium carbonate, anhydrous ammonia, t-butylamine or ...

  6. Thermal Stability of Modified i-Motif Oligonucleotides with Naphthalimide Intercalating Nucleic Acids

    El-Sayed, Ahmed Ali; Pedersen, Erik B.; Khaireldin, Nahid Y.

    2016-01-01

    naphthalimide (1H-benzo[de]isoquinoline-1,3(2H)-dione) as the intercalating nucleic acid. The stabilities of i-motif structures with inserted naphthalimide intercalating nucleotides were studied using UV melting temperatures (Tm) and circular dichroism spectra at different pH values and conditions (crowding and...

  7. MicroRNA fate upon targeting with anti-miRNA oligonucleotides as revealed by an improved Northern-blot-based method for miRNA detection

    Torres, Adrian G.; Fabani, Martin M.; Vigorito, Elena; Gait, Michael J.

    2011-01-01

    MicroRNAs (miRNAs) are small non-coding RNAs involved in fine-tuning of gene regulation. Antisense oligonucleotides (ONs) are promising tools as anti-miRNA (anti-miR) agents toward therapeutic applications and to uncover miRNA function. Such anti-miR ONs include 2′-O-methyl (OMe), cationic peptide nucleic acids like K-PNA-K3, and locked nucleic acid (LNA)-based anti-miRs such as LNA/DNA or LNA/OMe. Northern blotting is a widely used and robust technique to detect miRNAs. However, miRNA quanti...

  8. Monoclonal antibodies targeted to alpha-oligonucleotides. Characterisation and application in nucleic acid detection.

    Cros, P.; Kurfürst, R; Allibert, P; Battail, N; Piga, N; Roig, V; Thuong, N T; Mandrand, B; Hélène, C

    1994-01-01

    The aim of the present study was to test the antigenicity of alpha-deoxyribonucleotides in order to develop a new tool for the detection of nucleic acid sequences for use in diagnostic applications. We describe four monoclonal antibodies (Mabs) which recognize alpha-deoxyribonucleotides. Two were raised against a poly(alpha-dT) sequence and specifically recognized the alpha-dT nucleotide. Two were raised against a sequence containing all four common nucleotides as alpha-nucleotides and, surpr...

  9. Intracellular Uptake of Modified Oligonucleotide Studied by Two Fluorescence Techniques

    Kočišová, E.; Praus, P.; Rosenberg, Ivan; Seksek, O.; Sureau, F.; Štěpánek, J.; Turpin, P. Y.

    2004-01-01

    Roč. 74, - (2004), s. 110-114. ISSN 0006-3525 R&D Projects: GA ČR GA203/01/1166; GA ČR GP202/03/D118 Institutional research plan: CEZ:AV0Z4055905 Keywords : cellular uptake * antisense oligonucleotide * flluorescence microimagigng Subject RIV: CC - Organic Chemistry Impact factor: 2.863, year: 2004

  10. Antisense mediated exon skipping therapy for duchenne muscular dystrophy (DMD)

    Brolin, Camilla; Shiraishi, Takehiko

    2011-01-01

    Duchenne Muscular Dystrophy (DMD) is a lethal disease caused by mutations in the dystrophin gene (DMD) that result in the absence of essential muscle protein dystrophin. Among many different approaches for DMD treatment, exon skipping, mediated by antisense oligonucleotides, is one of the most promising methods for restoration of dystrophin expression. This approach has been tested extensively targeting different exons in numerous models both in vitro and in vivo. During the past 10 years, th...

  11. Progress in therapeutic antisense applications for neuromuscular disorders

    Aartsma-Rus, Annemieke; van Ommen, Gert-Jan B.

    2009-01-01

    Neuromuscular disorders are a frequent cause of chronic disability in man. They often result from mutations in single genes and are thus, in principle, well suited for gene therapy. However, the tissues involved (muscle and the central nervous system) are post-mitotic, which poses a challenge for most viral vectors. In some cases, alternative approaches may use small molecules, for example, antisense oligonucleotides (AONs). These do not deliver a new gene, but rather modulate existing gene p...

  12. Construction of Prokaryotic Expressing Vector of Antisense Nucleic Acid of LasR and Its Effect on the Virulence of Pseudomonas Aeruginosus

    ZHANG Ling; ZHOU Junli; LI Jingming; LIAO Fang

    2007-01-01

    To construct a pUCP18/lasRantisense plasmid carrying the reversed gene and analyze its effect on the virulence of Pseudomonas aeruginosus, LasR gene was amplified from the genome of Pseudomonas aeruginosus by PCR and reversely recombined with plasmid pUCP18. The recombinant pUCP18/lasRantisense was verified by enzyme digestion, PCR and sequencing. The biological effects of pUCP18/lasRantisense were examined by using RT-PCR, NAD method and the assay of pyocyanin. Our results showed that the expected full length lasR fragment (721 bp) was extended from Pseudomonas aeruginosus gene with PCR. And it is consistent with LasR gene of Pseudomonas aeruginosa in GenBank (No. NC_002516). The recombinant plasmid was successfully constructed and transferred into Pseudomonas aeruginosus. The antisense nucleic acid of LasR gene could reduce the virulence of Pseudomonas aeruginosus and might serve as a new target site for treatment purpose.

  13. Sense-, antisense- and RNAi-4CL1 regulate soluble phenolic acids, cell wall components and growth in transgenic Populus tomentosa Carr.

    Tian, Xiaoming; Xie, Jin; Zhao, Yanling; Lu, Hai; Liu, Shichang; Qu, Long; Li, Jianmei; Gai, Ying; Jiang, Xiangning

    2013-04-01

    Regulation of lignin biosynthesis affects plant growth and wood properties. Transgenic downregulation of 4-coumarate:coenzyme A ligase (4CL, EC 6.2.1.12) may reduce lignin content in cell walls, which could improve the qualities of pulp in papermaking and increase the efficiency of bioenergy applications. To determine the effects of Ptc4CL1 on lignin biosynthesis and plant growth, Populus tomentosa Carr. was transformed using sense-, antisense-, and RNAi-4CL1 genes. The growth properties, gene expression, enzyme activity, lignin content and composition and content of soluble phenolic acids were investigated in 1-year-old field-grown transgenic poplar trees. Transgenic up- and down-regulation of 4CL1 altered lignin content and composition in transgenic poplars, but there were no negative effects on the growth of transgenic plants. In addition, the severe changes in auxin observed in transgenic lines led to significantly enhanced growth performance. Furthermore, lignin content was tightly correlated with the alteration of 4CL1 enzymatic activity, which was correlated with 4CL1 gene expression. A significant increase in S units in lignin with a slight increase in sinapic acid was observed in 4CL1 down-regulated transgenic poplars. These results suggest that 4CL1 is a traffic control gene in monolignol biosynthesis and confirm that 4CL1 activity has been implicated with sinapoyl activation. Finally, our data demonstrate that there is cross-correlation among 4CL1 gene expression, 4CL1 enzyme activity, soluble phenolic acid, lignin monomer biosynthesis, and lignin content. PMID:23434928

  14. MPC30-DEA70-loaded transforming growth factor beta1 antisense oligonucleotide for transfection of cardiomyocytes%磷酸胆碱聚合物MPC30-DEA70负载转化生长因子β1AS-ODN转染心肌细胞

    杨煜; 张敏; 徐建荣; 林雪烽; 赵侠; 王志荣; 曹希传; 张卓琦

    2015-01-01

    BACKGROUND:Currently, antisense oligonucleotides (AS-ODN) have a good prospect in gene therapy, but AS-ODN with smal molecular weight cannot easily enter into the cels, which is susceptible to nuclease degradation. Therefore, there is stil a lack of fundamental understanding about how to improve their transfection efficiency, and target-based transferring. OBJECTIVE:To investigate whether a weak cationic and phosphorylcholine-containing diblock copolymer (MPC30-DEA70) can act as a carrier system to deliver a chemicaly synthesized transforming growth factor-β1 (TGF-β1) AS-ODN into myocardial cels. METHODS: MPC30-DEA70 was compounded with TGF-β1 AS-ODN at various N/P ratios and the MPC30-DEA70/TGF-β1 AS-ODN complexes were characterized by DNA electrophoresis. MTT assay was used to observe the biocompatibility. Confocal laser scanning microscope was used to observe the distribution and location of MPC30- DEA70/TGF-β1 AS-ODN in cells. Flow cytometry was used to detect the transfection efficiency and fluorescence intensity of MPC30-DEA70/TGF-β1 AS-ODN in cells. Western blot and RT-PCR methods were employed to measure the expression of TGF-β1 in cells. RESULTS AND CONCLUSION: Cell growth inhibition showed that the MPC30-DEA70 had low cytotoxicity to myocardial cells within the effective transfection dosage range (20 mg/L)下才表现出一定的细胞毒性并呈剂量依赖;MPC30-DEA70/TGF-β1AS-ODN 复合物对心肌细胞具有较高的转染效率,并且能够携带转化生长因子β1 AS-ODN进入细胞后下调转化生长因子β1 mRNA和蛋白的表达。新型阳离子磷酸胆碱基聚合物MPC30-DEA70可以有效负载和运输转化生长因子。

  15. Targeting chromosomal sites with locked nucleic acid-modified triplex-forming oligonucleotides: study of efficiency dependence on DNA nuclear environment

    Brunet, Erika; Corgnali, Maddalena; Cannata, Fabio; Perrouault, Loïc; Giovannangeli, Carine

    2006-01-01

    Triplex-forming oligonucleotides (TFOs) are synthetic DNA code-reading molecules that have been demonstrated to function to some extent in chromatin within cell nuclei. Here we have investigated the impact of DNA nuclear environment on the efficiency of TFO binding. For this study we have used locked nucleic acid-containing TFOs (TFO/LNAs) and we report the development of a rapid PCR-based method to quantify triplex formation. We have first compared triplex formation on genes located at diffe...

  16. A newly discovered member of the fatty acid desaturase gene family: a non-coding, antisense RNA gene to delta5-desaturase.

    Dreesen, Thomas D; Adamson, Aaron W; Tekle, Michael; Tang, Chongren; Cho, Hyekung P; Clarke, Steven D; Gettys, Thomas W

    2006-08-01

    The rate limiting steps in the conversion of 18-carbon unsaturated fatty acids to 20- and 22-carbon products are catalyzed by two desaturase enzymes (Delta5-desaturase and Delta6-desaturase) found within a lipid desaturase gene cluster. Careful examination of this cluster revealed the existence of a conventionally spliced (human) and an intronless (mouse and rat) non-coding RNA gene, reverse Delta5-desaturase, which is transcribed from the opposite strand of the Delta5-desaturase gene. The 654 bp human reverse Delta5-desaturase transcript contains 269 nucleotides that are complementary to exon 1 and intron 1 of the Delta5-desaturase transcript, and the 3'-end of this sequence contains a 143 nucleotide stretch that is 100% complementary to the 5'-end of the Delta5-desaturase. The rat and mouse transcripts are 1355 and 690 bp long and complementary to a portion of the first intron and the entire first exon of their respective Delta5-desaturases. All reverse Delta5-desaturase transcripts contain several stop codons in all frames suggesting that they do not encode a peptide. Reverse Delta5-desaturase RNA was detected in all rat tissues where Delta5-desaturase is expressed, and the transition between fasting and refeeding produced a significant increase in reverse Delta5-desaturase RNA relative to Delta5-desaturase mRNA. Transient expression of reverse Delta5-desaturase in CHO cells stably transformed with Delta5-desaturase produced a modest decrease in Delta5-desaturase mRNA (30%), but lowered Delta5-desaturase enzymatic activity by >70%. More importantly, a diet enriched in fish oil produced a reciprocal increase in reverse Delta5-desaturase mRNA and decrease in Delta5-desaturase mRNA that was accompanied by a 5-6-fold decrease in Delta5-desaturase enzyme activity. These findings support a significant role for reverse Delta5-desaturase as a natural antisense regulator of Delta5-desaturase. PMID:16846730

  17. TSUNAMI: an antisense method to phenocopy splicing-associated diseases in animals

    Sahashi, Kentaro; Hua, Yimin; Ling, Karen K Y; Hung, Gene; Rigo, Frank; Horev, Guy; Katsuno, Masahisa; Sobue, Gen; Ko, Chien-Ping; Bennett, C. Frank; Krainer, Adrian R.

    2012-01-01

    This study presents an antisense oligonucleotide methodology to phenocopy a disease—in this case, the motor neuron disease spinal muscular atrophy in mice. Sahashi et al. show that it is possible to fine-tune disease severity through dose-dependent effects on RNA splicing, making this a novel animal model for monitoring disease onset and progression as well as testing candidate therapeutics.

  18. [Exon skipping therapy for Duchenne muscular dystrophy by using antisense Morpholino].

    Takeda, Shin'ichi

    2009-11-01

    Duchenne muscular dystrophy (DMD) is caused by the lack of dystrophin protein at the sarcolemma. Exon skipping by antisense oligonucleotides is a novel method to restore the reading frame of the mutated DMD gene, and rescue dystrophin production. We recently reported that systemic delivery of Morpholino antisense oligonucleotides targeting exon 6 and 8 of the canine DMD gene, efficiently recovered functional dystrophin proteins at the sarcolamma of dystrophic dogs, and improved performance of affected dogs without serious side effects (Yokota et al., Ann Neurol. 65 (6): 667-676, 2009). To optimize therapeutic antisense Morpholinos for more frequent mutations of the DMD gene, we designed antisense Morpholinos targeting exon 51 of the mouse DMD gene, and injected them separately or in combination into the muscles of mdx52 mice, in which exon 52 has been deleted by a gene targeting technique (Araki et al., 1997). We also tried systemic delivery of antisense Morpholino to skip exon 51 in mdx52 mice. It is important to verify the effectiveness and side effects of antisense Morpholino in experimental animal models such as dystrophic dogs or mdx52 mice, before clinical trials in DMD patients. PMID:20030230

  19. Inhibiting the growth of methicillin-resistant Staphylococcus aureus in vitro with antisense peptide nucleic acid conjugates targeting the ftsZ gene

    Shumei Liang

    2015-01-01

    Conclusion: Our results demonstrate that the potent effects of PNAs on bacterial growth and cell viability were mediated by the down-regulation or even knock-out of ftsZ gene expression. This highlights the utility of ftsZ as a promising target for the development of new antisense antibacterial agents to treat MRSA infections.

  20. Identification and characterization of high affinity antisense PNAs for the human unr (upstream of N-ras) mRNA which is uniquely overexpressed in MCF-7 breast cancer cells.

    Fang, Huafeng; Yue, Xuan; Li, Xiaoxu; Taylor, John-Stephen

    2005-01-01

    We have recently shown that an MCF-7 tumor can be imaged in a mouse by PET with 64Cu-labeled Peptide nucleic acids (PNAs) tethered to the permeation peptide Lys4 that recognize the uniquely overexpressed and very abundant upstream of N-ras or N-ras related gene (unr mRNA) expressed in these cells. Herein we describe how the high affinity antisense PNAs to the unr mRNA were identified and characterized. First, antisense binding sites on the unr mRNA were mapped by an reverse transcriptase random oligonucleotide library (RT-ROL) method that we have improved, and by a serial analysis of antisense binding sites (SAABS) method that we have developed which is similar to another recently described method. The relative binding affinities of oligodeoxynucleotides (ODNs) complementary to the antisense binding sites were then qualitatively ranked by a new Dynabead-based dot blot assay. Dissociation constants for a subset of the ODNs were determined by a new Dynabead-based solution assay and were found to be 300 pM for the best binders in 1 M salt. PNAs corresponding to the ODNs with the highest affinities were synthesized with an N-terminal CysTyr and C-terminal Lys4 sequence. Dissociation constants of these hybrid PNAs were determined by the Dynabead-based solution assay to be about 10 pM for the highest affinity binders. PMID:16314303

  1. Rational design of point mutation-selective antisense DNA targeted to codon 12 of Ha-ras mRNA in human cells.

    Duroux, I; Godard, G; Boidot-Forget, M; Schwab, G; Hélène, C; Saison-Behmoaras, T

    1995-01-01

    Antisense oligodeoxynucleotides targeted to Ha-ras mRNA have been designed to discriminate between the codon 12-mutated oncogene and the normal proto-oncogene. An in vitro assay using two different sources of RNase H (rabbit reticulocyte lysates and nuclear extract from HeLa cells) was used to characterize oligonucleotide binding to normal and mutated Ha-ras mRNA. Short oligonucleotides (12- or 13mers) centered on the mutation had a very high discriminatory efficiency. Longer oligonucleotides...

  2. Splice-correcting oligonucleotides restore BTK function in X-linked agammaglobulinemia model

    Bestas, Burcu; Moreno, Pedro M D; Blomberg, K Emelie M;

    2014-01-01

    X-linked agammaglobulinemia (XLA) is an inherited immunodeficiency that results from mutations within the gene encoding Bruton's tyrosine kinase (BTK). Many XLA-associated mutations affect splicing of BTK pre-mRNA and severely impair B cell development. Here, we assessed the potential of antisense...... engineered a transgenic mouse that harbors a BAC with an authentic, mutated, splice-defective human BTK gene. BTK transgenic mice were bred onto a Btk knockout background to avoid interference of the orthologous mouse protein. Using this model, we determined that BTK-specific SCOs are able to correct......, splice-correcting oligonucleotides (SCOs) targeting mutated BTK transcripts for treating XLA. Both the SCO structural design and chemical properties were optimized using 2'-O-methyl, locked nucleic acid, or phosphorodiamidate morpholino backbones. In order to have access to an animal model of XLA, we...

  3. Undetected antisense tRNAs in mitochondrial genomes?

    Seligmann Hervé

    2010-06-01

    Full Text Available Abstract Background The hypothesis that both mitochondrial (mt complementary DNA strands of tRNA genes code for tRNAs (sense-antisense coding is explored. This could explain why mt tRNA mutations are 6.5 times more frequently pathogenic than in other mt sequences. Antisense tRNA expression is plausible because tRNA punctuation signals mt sense RNA maturation: both sense and antisense tRNAs form secondary structures potentially signalling processing. Sense RNA maturation processes by default 11 antisense tRNAs neighbouring sense genes. If antisense tRNAs are expressed, processed antisense tRNAs should have adapted more for translational activity than unprocessed ones. Four tRNA properties are examined: antisense tRNA 5' and 3' end processing by sense RNA maturation and its accuracy, cloverleaf stability and misacylation potential. Results Processed antisense tRNAs align better with standard tRNA sequences with the same cognate than unprocessed antisense tRNAs, suggesting less misacylations. Misacylation increases with cloverleaf fragility and processing inaccuracy. Cloverleaf fragility, misacylation and processing accuracy of antisense tRNAs decrease with genome-wide usage of their predicted cognate amino acid. Conclusions These properties correlate as if they adaptively coevolved for translational activity by some antisense tRNAs, and to avoid such activity by other antisense tRNAs. Analyses also suggest previously unsuspected particularities of aminoacylation specificity in mt tRNAs: combinations of competition between tRNAs on tRNA synthetases with competition between tRNA synthetases on tRNAs determine specificities of tRNA amino acylations. The latter analyses show that alignment methods used to detect tRNA cognates yield relatively robust results, even when they apparently fail to detect the tRNA's cognate amino acid and indicate high misacylation potential. Reviewers This article was reviewed by Dr Juergen Brosius, Dr Anthony M Poole and

  4. On-line coupling of capillary gel electrophoresis with electrospray mass spectrometry for oligonucleotide analysis.

    Freudemann, T; von Brocke, A; Bayer, E

    2001-06-01

    Homooligodeoxyribonucleotides differing one nucleotide in length from 12- to 15-mer and from 17- to 20-mer were separated by size with capillary gel electrophoresis (CGE) using an entangled polymer solution in coated capillaries. The resolved components were analyzed by on-line coupling of CGE with electrospray mass spectrometry (ES-MS), denoted as CGE/ES-MS, in the full-scan negative ion detection mode. Baseline separation was achieved for the 12-15-mer oligonucleotide mixtures. Both synthetic phosphodiester oligonucleotide mixtures as well as their phosphorothioate analogues, serving as model compounds for antisense oligonucleotides, could be analyzed by on-line CGE/ES-MS coupling. Terminally phosphorylated and nonphosphorylated synthetic failure sequences could be electrophoretically separated and mass spectrometically characterized as well. This methodology might be a useful tool for synthesis control of phosphodiester oligonucleotides as well as for analysis of phosphorothioate analogues as they are used in antisense drug development. PMID:11403304

  5. c-FLIP antisense oligonucleotide-loaded nanoparticles inhibit growth of human orbital rhabdomyosarcoma xenograft in nude mice%c-FLIP反义寡核苷酸纳米粒抑制人眼眶横纹肌肉瘤裸鼠移植瘤的生长

    梁莉; 魏锐利

    2013-01-01

    Objective To investigate the effect of cellular Fas-associated death domain-like interleukin-1β-converting enzyme-inhibitory protein (c-FLIP) antisense oligonucleotide (ASODN)-loaded nanoparticles (NP) on the human orbital rhabdomyosarcoma xenograft in nude mice,so as to assess the feasibility of nanoparticles as a gene vector.Methods The model of human orbital rhabdomyosarcoma xenograft was established in nude mice,and the tumors were injected with c-FLIP ASODN NP,c-FLIP ASODN or normal saline (NS).The tumor volume and histopathological changes of tumor were observed.Western blotting analysis and immunohistochemical analysis were used to examine the expression of c-FLIP in tumor tissues of each group.Apoptosis of tumor cells was detected using TUNEL method.Results The growth of human orbital rhabdomyosarcoma in nude mice was significantly inhibited in ASODN NP group compared with the other two groups.Western blotting analysis showed that c-FLIP protein expression in ASODN NP and ASODN groups was significantly decreased compared with NS group (P<0.05).Immunohistochemical study showed that c-FLIP expression was found in the endochylema,and the c-FLIP positive cells in ASODN NP group was significantly less than those in the other two groups (P<0.05).Tumor cell apoptosis was observed in both ASODN NP and ASODN groups,with more found in the former,and only a few apoptotic cells were found in the NS group.Conclusion c-FLIP ASODN NP can effectively inhibit the growth of human orbital rhabdomyosarcoma xenograft in nude mice,indicating that nanoparticles may serve as a safe and effective vector for ASODN.%目的 探讨c-FLIP反义寡核苷酸(c-FLIP ASODN)纳米粒(NP)对裸鼠体内人眼眶横纹肌肉瘤移植瘤生长的影响,评估纳米粒作为基因载体的可行性.方法 皮下种植法建立裸鼠人眼眶横纹肌肉瘤动物模型,瘤体内分别注射c-FLIP反义寡核苷酸纳米粒(ASODN NP组)、未包裹的c-FLIP反义寡核苷酸(ASODN组)及生

  6. Ca2+ enrichment in culture medium potentiates effect of oligonucleotides.

    Hori, Shin-Ichiro; Yamamoto, Tsuyoshi; Waki, Reiko; Wada, Shunsuke; Wada, Fumito; Noda, Mio; Obika, Satoshi

    2015-10-30

    Antisense and RNAi-related oligonucleotides have gained attention as laboratory tools and therapeutic agents based on their ability to manipulate biological events in vitro and in vivo. We show that Ca(2+) enrichment of medium (CEM) potentiates the in vitro activity of multiple types of oligonucleotides, independent of their net charge and modifications, in various cells. In addition, CEM reflects in vivo silencing activity more consistently than conventional transfection methods. Microscopic analysis reveals that CEM provides a subcellular localization pattern of oligonucleotides resembling that obtained by unassisted transfection, but with quantitative improvement. Highly monodispersed nanoparticles ~100 nm in size are found in Ca(2+)-enriched serum-containing medium regardless of the presence or absence of oligonucleotides. Transmission electron microscopy analysis reveals that the 100-nm particles are in fact an ensemble of much smaller nanoparticles (ϕ ∼ 15 nm). The presence of these nanoparticles is critical for the efficient uptake of various oligonucleotides. In contrast, CEM is ineffective for plasmids, which are readily transfected via the conventional calcium phosphate method. Collectively, CEM enables a more accurate prediction of the systemic activity of therapeutic oligonucleotides, while enhancing the broad usability of oligonucleotides in the laboratory. PMID:26101258

  7. Synthesis of Biotin Linkers with the Activated Triple Bond Donor [p-(N-propynoylaminotoluic Acid] (PATA for Efficient Biotinylation of Peptides and Oligonucleotides

    Martina Jezowska

    2012-11-01

    Full Text Available Biotin is an important molecule for modern biological studies including, e.g., cellular transport. Its exclusive affinity to fluorescent streptavidin/avidin proteins allows ready and specific detection. As a consequence methods for the attachment of biotin to various biological targets are of high importance, especially when they are very selective and can also proceed in water. One useful method is Hüisgen dipolar [3+2]-cycloaddition, commonly referred to as “click chemistry”. As we reported recently, the activated triple bond donor p-(N-propynoylaminotoluic acid (PATA gives excellent results when used for conjugations at submicromolar concentrations. Thus, we have designed and synthesized two biotin linkers, with different lengths equipped with this activated triple bond donor and we proceeded with biotinylation of oligonucleotides and C-myc peptide both in solution and on solid support with excellent yields of conversion.

  8. Transfection of hypertrophic cardiac myocytes in vitro with 99Tcm-labeled antisense miR208b oligonucleotide%99Tcm标记反义miR208b寡核苷酸及其转染离体肥大心肌细胞的实验研究

    王静; 冯会娟; 欧阳伟; 孙云钢; 吴菊清; 陈盼

    2015-01-01

    Objective To test the efficiency of transfecting 9 Tcm-labeled anti-miR208b oligonucleotide into early hypertrophic cardiac myocytes in vitro. Methods The anti-oligonucleotide targeting miR208b (AMO) was synthesized and modified with LNA followed by conjugation with N-hydroxysuccinimidyl S-acetyl-meraptoacetyl triglycine (NHS-MAG3) and radiolabeling with 9 Tcm. NHS-MAG3-LNA-AMO and labeled AMO were purified with Sep-Pak C18 column chromatography, and the former was examined for UV absorption at the 260 nm using Gene Quant DNA/RNA calculator. The labeling efficiency, radiochemical purity, stability and molecular hybridization activity were analyzed. An angiotensin II-induced cell model of hypertrophic cardiac myocytes was transfected with 9 Tcm-NHS-MAG3-LNA-AMO via liposome, and the relative expression of miRNA208b and retention ratio of the labeled AMO in early hypertrophic cells were determined. Results The labeling efficiency and radiochemical purity of the labeled AMO after purification exceeded 84% and 86%, respectively. The radio-chemical purities of the labeled AMO incubated in serum and normal saline for 12 h were both higher than 80%, and the labeled AMO showed a capacity to hybridize with the target gene. In the hypertrophic model of cardiac myocytes, the retention ratio of labeled AMO at 6 h was higher than 20%. Conclusion The 9 Tcm-labeled antisense probe can be efficiently transfected into hypertrophic cardiac myocytes in vitro, which provides an experimental basis for subsequent radionuclide imaging studies.%目的:探索用放射性核素99Tcm标记反义miR208b寡核苷酸,并转染离体早期肥大心肌细胞的实验过程及方法。方法合成针对miR208b的反义miR寡核苷酸(AMO),LNA(带锁核酸)修饰AMO,将双功能螯合剂NHS-MAG3(N-羟基琥珀酰亚胺-巯基乙酰基三甘氨酸)与LNA-AMO偶联后,用99Tcm标记,然后用Sep-Pak C18反相层析法对NHS-MAG3-LNA-AMO及其标记物进行洗

  9. Targeted antisense radiotherapy and dose fractionation using a 177Lu-labeled anti-bcl-2 peptide nucleic acid-peptide conjugate

    Introduction: The overall goal of these studies was to test the hypothesis that simultaneous down-regulation of a tumor survival gene and delivery of internally emitted cytotoxic radiation will be more effective than either treatment modality alone. The objectives were to evaluate the therapeutic efficacy of a 177Lu-labeled anti-bcl-2-PNA-Tyr3-octreotate antisense conjugate in a mouse model bearing human non-Hodgkin’s lymphoma (NHL) tumor xenografts and to optimize targeted antisense radiotherapy by dose fractionation. Methods: In the initial therapy studies, tumor-bearing mice were given saline, nonradioactive DOTA-anti-bcl-2-PNA-Tyr3-octreotate, 177Lu-DOTA-Tyr3-octreotate, 177Lu-DOTA-PNA-peptide alone, or 177Lu-DOTA-PNA-peptide followed by a chase dose of nonradioactive PNA-peptide. The MTD of 177Lu-DOTA-anti-bcl-2-PNA-Tyr3-octreotate was then determined. Subsequently single dose MTD and four weekly fractionated doses were directly compared, followed by histopathologic evaluation. Results: Antisense radiotherapy using 4.44 MBq of the 177Lu-DOTA-PNA-peptide followed by nonradioactive PNA-peptide was significantly more effective than other low dose treatment regimens. A dose of 18.5 MBq of 177Lu-DOTA-PNA-peptide was determined to be the approximate maximum tolerated dose (MTD). The median times to progression to a 1 cm3 tumor volume were 32 and 49 days for single dose MTD and fractionated dose (4 × 4.63 MBq) groups, respectively. Histopathology revealed metastases in the single dose groups, but not in the dose fractionation group. Conclusions: Targeted antisense radiotherapy using 177Lu-DOTA-anti-bcl-2-PNA-Tyr3-octreotate and DOTA-PNA-peptide conjugate effectively inhibited tumor progression in a mouse model of NHL. Furthermore, a dose fractionation regimen had a significant advantage over a single high dose, in terms of tumor growth inhibition and prevention of metastasis. Advances in knowledge and implications for patient care: Down-regulating bcl-2, an anti

  10. In vitro detection of mdr1 mRNA in murine leukemia cells with {sup 111}In-labeled oligonucleotide

    Bai Jingming; Yokoyama, Kunihiko; Kinuya, Seigo; Michigishi, Takatoshi; Tonami, Norihisa [Kanazawa University Graduate School of Medical Sciences, Department of Biotracer Medicine (Nuclear Medicine), Kanazawa (Japan); Shiba, Kazuhiro [Kanazawa University, Radioisotope Center, Kanazawa (Japan); Matsushita, Ryo [Kanazawa University, Laboratory for Development of Medicine, Faculty of Pharmaceutical Sciences, Kanazawa (Japan); Nomura, Masaaki [Kanazawa University Hospital, Hospital Pharmacy, Kanazawa (Japan)

    2004-11-01

    The feasibility of intracellular mdr1 mRNA expression detection with radiolabeled antisense oligonucleotide (ODN) was investigated in the murine leukemia cell line, P388/S, and its subclonal, adriamycin-resistant cell line, P388/R. The expression level of mdr1 mRNA was analyzed by reverse transcription-polymerase chain reaction (RT-PCR). Existence of the multidrug resistance (MDR) phenomenon was assessed via cellular uptake of {sup 99m}Tc-sestamibi (MIBI), a known substrate for P-glycoprotein. A 15-mer phosphorothioate antisense ODN complementary to the sequences located at -1 to 14 of mdr1 mRNA and its corresponding sense ODN were conjugated with the cyclic anhydride of diethylene triamine penta-acetic acid (cDTPA) via an amino group linked to the terminal phosphate at the 5' end at pH 8-9. The DTPA-ODN complexes at concentrations of 0.1-17.4 {mu}Mwere reacted with {sup 111}InCl{sub 3} at pH 5 for 1 h. The hybridization affinity of labeled ODN was evaluated with size-exclusion high-performance liquid chromatography following incubation with the complementary sequence. Cellular uptake of labeled ODN was examined in vitro. Furthermore, enhancing effects of synthetic lipid carriers (Transfast) on transmembrane delivery of ODN were assessed. P388/R cells displayed intense mdr1 mRNA expression in comparison with P388/S cells. {sup 99m}Tc-MIBI uptake in P388/S cells was higher than that in P388/R cells. Specific radioactivity up to 1,634 MBq/nmol was achieved via elevation of added radioactivity relative to ODN molar amount. The hybridization affinity of antisense {sup 111}In-ODN was preserved at approximately 85% irrespective of specific activity. Cellular uptake of antisense {sup 111}In-ODN did not differ from that of sense {sup 111}In-ODN in either P388/S cells or P388/R cells. However, lipid carrier incorporation significantly increased transmembrane delivery of {sup 111}In-ODN; moreover, specific uptake of antisense {sup 111}In-ODN was demonstrated in P388/R

  11. Design and analysis of effects of triplet repeat oligonucleotides in cell models for myotonic dystrophy

    Gonzalez-Barriga, A.; Mulders, S.A.M.; Giessen, J. van der; Hooijer, J.D.; Bijl, S.; Kessel, I.D.G. van; Beers, J. van; Deutekom, J.C. van; Fransen, J.A.M.; Wieringa, B.; Wansink, D.G.

    2013-01-01

    Myotonic dystrophy type 1 (DM1) is caused by DM protein kinase (DMPK) transcripts containing an expanded (CUG)n repeat. Antisense oligonucleotide (AON)-mediated suppression of these mutant RNAs is considered a promising therapeutic strategy for this severe disorder. Earlier, we identified a 2'-O-met

  12. Mucin-mediated nanocarrier disassembly for triggered uptake of oligonucleotides as a delivery strategy for the potential treatment of mucosal tumours

    Martirosyan, A.; Olesen, M. J.; Fenton, R. A.; Kjems, J.; Howard, K. A.

    2016-06-01

    This work demonstrates gastric mucin-triggered nanocarrier disassembly for release of antisense oligonucleotides and consequent unassisted cellular entry as a novel oral delivery strategy. A fluorescence activation-based reporter system was used to investigate the interaction and mucin-mediated disassembly of chitosan-based nanocarriers containing a 13-mer DNA oligonucleotide with a flanked locked RNA nucleic acid gapmer design. Gastric mucins were shown to trigger gapmer release from nanocarriers that was dependent on the interaction time, mucin concentration and N : P ratio with a maximal release at N : P 10. In contrast to siRNA, naked gapmers exhibited uptake into mucus producing HT-MTX mono-cultures and HT-MTX co-cultured with the carcinoma epithelial cell line Caco-2. Importantly, in vivo gapmer uptake was observed in epithelial tissue 30 min post-injection in murine intestinal loops. The findings present a mucosal design-based system tailored for local delivery of oligonucleotides that may maximize the effectiveness of gene silencing therapeutics within tumours at mucosal sites.This work demonstrates gastric mucin-triggered nanocarrier disassembly for release of antisense oligonucleotides and consequent unassisted cellular entry as a novel oral delivery strategy. A fluorescence activation-based reporter system was used to investigate the interaction and mucin-mediated disassembly of chitosan-based nanocarriers containing a 13-mer DNA oligonucleotide with a flanked locked RNA nucleic acid gapmer design. Gastric mucins were shown to trigger gapmer release from nanocarriers that was dependent on the interaction time, mucin concentration and N : P ratio with a maximal release at N : P 10. In contrast to siRNA, naked gapmers exhibited uptake into mucus producing HT-MTX mono-cultures and HT-MTX co-cultured with the carcinoma epithelial cell line Caco-2. Importantly, in vivo gapmer uptake was observed in epithelial tissue 30 min post-injection in murine intestinal

  13. Modulating anti-MicroRNA-21 activity and specificity using oligonucleotide derivatives and length optimization

    Munoz-Alarcon, Andres; Guterstam, Peter; Romero, Cristian;

    2012-01-01

    MicroRNAs are short, endogenous RNAs that direct posttranscriptional regulation of gene expression vital for many developmental and cellular functions. Implicated in the pathogenesis of several human diseases, this group of RNAs provides interesting targets for therapeutic intervention. Anti......-microRNA oligonucleotides constitute a class of synthetic antisense oligonucleotides used to interfere with microRNAs. In this study, we investigate the effects of chemical modifications and truncations on activity and specificity of anti-microRNA oligonucleotides targeting microRNA-21. We observed an increased activity...

  14. Sense antisense DNA strand?

    Boldogkói, Z; Kaliman, A V; Murvai, J; Fodor, I

    1994-01-01

    Recent evidence indicates that alphaherpesviruses express latency associated transcripts (LATs) from the antisense strand of immediate-early (IE) genes of the viral genome. It has been suggested that LATs containing extended open reading frames (ORFs), might be translated into (a) protein product(s). We found that a salient feature of some herpesvirus DNAs is a high GC preference at the third codon positions. The consequence of this feature is that the probability of a stop-codon appearing at two of the six reading frames of the DNA strand is very low. Therefore, the presence of an extended ORF does not necessarily mean that it is relevant to real translation. PMID:7810418

  15. Antisense Mediated Splicing Modulation For Inherited Metabolic Diseases: Challenges for Delivery

    Pérez, Belen; Vilageliu, Lluisa; Grinberg, Daniel; Desviat, Lourdes R.

    2014-01-01

    In the past few years, research in targeted mutation therapies has experienced significant advances, especially in the field of rare diseases. In particular, the efficacy of antisense therapy for suppression of normal, pathogenic, or cryptic splice sites has been demonstrated in cellular and animal models and has already reached the clinical trials phase for Duchenne muscular dystrophy. In different inherited metabolic diseases, splice switching oligonucleotides (SSOs) have been used with suc...

  16. Sustained Release of Cx43 Antisense Oligodeoxynucleotides from Coated Collagen Scaffolds Promotes Wound Healing.

    Gilmartin, Daniel J; Soon, Allyson; Thrasivoulou, Christopher; Phillips, Anthony R J; Jayasinghe, Suwan N; Becker, David L

    2016-07-01

    Antisense oligodeoxynucleotides targeting the mRNA of the gap junction protein Cx43 promote tissue repair in a variety of different wounds. Delivery of the antisense drug has most often been achieved by a thermoreversible hydrogel, Pluronic F-127, which is very effective in the short term but does not allow for sustained delivery over several days. For chronic wounds that take a long time to heal, repeated dosing with the drug may be desirable but is not always compatible with conventional treatments such as the weekly changing of compression bandages on venous leg ulcers. Here the coating of collagen scaffolds with antisense oligonucleotides is investigated and a way to provide protection of the oligodeoxynucleotide drug is found in conjunction with sustained release over a 7 d period. This approach significantly reduces the normal foreign body reaction to the scaffold, which induces an increase of Cx43 protein and an inhibition of healing. As a result of the antisense integration into the scaffold, inflammation is reduced with the rate of wound healing and contracture is significantly improved. This coated scaffold approach may be very useful for treating venous leg ulcers and also for providing a sustained release of any other types of oligonucleotide drugs that are being developed. PMID:27253638

  17. Phylogenetic group- and species-specific oligonucleotide probes for single-cell detection of lactic acid bacteria in oral biofilms

    Quevedo, Beatrice; Giertsen, Elin; Zijnge, Vincent; Luethi-Schaller, Helga; Guggenheim, Bernhard; Thurnheer, Thomas; Gmuer, Rudolf

    2011-01-01

    Background: The purpose of this study was to design and evaluate fluorescent in situ hybridization (FISH) probes for the single-cell detection and enumeration of lactic acid bacteria, in particular organisms belonging to the major phylogenetic groups and species of oral lactobacilli and to Abiotroph

  18. Lysine metabolism in antisense C-hordein barley grains

    Schmidt, Daiana; Rizzi, Vanessa; Gaziola, Salete A;

    2015-01-01

    The grain proteins of barley are deficient in lysine and threonine due to their low concentrations in the major storage protein class, the hordeins, especially in the C-hordein subgroup. Previously produced antisense C-hordein transgenic barley lines have an improved amino acid composition, with ...

  19. VIP grafted long-circulation liposome for targeted delivery of oligonucleotide to breast cancer cells

    Purpose: To investigate the use of long-circulation liposome (LCL) for the delivery of encapsulated oligonucleotide with or without radioiodine-125 (125I) to MCF-7 breast cancer cells in vitro. Methods: (1) Oligonucleotide was labeled with 125I using thallium chloride tetrahydrate (TICL3) as an oxidant. 125I-oligonucleotide was separated from free oligonucleotide or 125I by column chromatography (Sephadex G-25). The efficiency of labeling and the radiochemistry purity were obtained using chromatography of paper. (2) Oligonucleotide with or without 125I encapsulating LCL were prepared in the means of reverse-phase evaporation. The crude LCL were then repeatedly extruded through 400 nm, 200 nm, 100 nm polycarbonate membranes consecutively. Uncapsulated oligonucleotide with or without 125I was separated from LCL formulations by passing down a sephadex G-50 column in 0.01 M HEPES buffer. Pooled LCL encapsulated oligonucleotide with or without 125I fractions were sterile through 0.22 μm filters prior to use. The method of protamine sulfate precipitation was utilized to gain the efficiency of encapsulation. (3) MCF-7 cells were grown in RPMI1640 media containing 10% heat-inactivated fetal calf serum. (4)Time-dependent uptake of 125I-oligonucleotide was studied by measuring the radioactivity of MCF-7 cells. Results: The efficiency of labeling and radiochemistry purity of bcl-2 antisense-, sense- and nonsense-oligonucleotide were 84.52% and 97.49%, 58.05% and 95.40%, 74.6% and 98.7%, respectively. The efficiency of encapsulation of bcl-2 antisense-, sense- and nonsense-oligonucleotide is 77.58%, 45.98%, 38.2%, respectively. (3) The par cle size of LCL formulations(∼120 nm) was determined by laser scattering techniques. During the period of observation from 20 min to 300 min, the radioactivity of tumor cells was almost as same as the background. Conclusions: LCL can not effectively deliver oligonucleotide with 125I into MCF-7 cells in vitro. To achieve the active

  20. Fragment-based solid-phase assembly of oligonucleotide conjugates with peptide and polyethylene glycol ligands.

    Dirin, Mehrdad; Urban, Ernst; Noe, Christian R; Winkler, Johannes

    2016-10-01

    Ligand conjugation to oligonucleotides is an attractive strategy for enhancing the therapeutic potential of antisense and siRNA agents by inferring properties such as improved cellular uptake or better pharmacokinetic properties. Disulfide linkages enable dissociation of ligands and oligonucleotides in reducing environments found in endosomal compartments after cellular uptake. Solution-phase fragment coupling procedures for producing oligonucleotide conjugates are often tedious, produce moderate yields and reaction byproducts are frequently difficult to remove. We have developed an improved method for solid-phase coupling of ligands to oligonucleotides via disulfides directly after solid-phase synthesis. A 2'-thiol introduced using a modified nucleotide building block was orthogonally deprotected on the controlled pore glass solid support with N-butylphosphine. Oligolysine peptides and a short monodisperse ethylene glycol chain were successfully coupled to the deprotected thiol. Cleavage from the resin and full removal of oligonucleotide protection groups were achieved using methanolic ammonia. After standard desalting, and without further purification, homogenous conjugates were obtained as demonstrated by HPLC, gel electrophoresis, and mass spectrometry. The attachment of both amphiphilic and cationic ligands proves the versatility of the conjugation procedure. An antisense oligonucleotide conjugate with hexalysine showed pronounced gene silencing in a cell culture tumor model in the absence of a transfection reagent and the corresponding ethylene glycol conjugate resulted in down regulation of the target gene to nearly 50% after naked application. PMID:27236069

  1. Mucin-mediated nanocarrier disassembly for triggered uptake of oligonucleotides as a delivery strategy for the potential treatment of mucosal tumours.

    Martirosyan, A; Olesen, M J; Fenton, R A; Kjems, J; Howard, K A

    2016-07-01

    This work demonstrates gastric mucin-triggered nanocarrier disassembly for release of antisense oligonucleotides and consequent unassisted cellular entry as a novel oral delivery strategy. A fluorescence activation-based reporter system was used to investigate the interaction and mucin-mediated disassembly of chitosan-based nanocarriers containing a 13-mer DNA oligonucleotide with a flanked locked RNA nucleic acid gapmer design. Gastric mucins were shown to trigger gapmer release from nanocarriers that was dependent on the interaction time, mucin concentration and N : P ratio with a maximal release at N : P 10. In contrast to siRNA, naked gapmers exhibited uptake into mucus producing HT-MTX mono-cultures and HT-MTX co-cultured with the carcinoma epithelial cell line Caco-2. Importantly, in vivo gapmer uptake was observed in epithelial tissue 30 min post-injection in murine intestinal loops. The findings present a mucosal design-based system tailored for local delivery of oligonucleotides that may maximize the effectiveness of gene silencing therapeutics within tumours at mucosal sites. PMID:26694897

  2. Increasing the Analytical Sensitivity by Oligonucleotides Modified with Para- and Ortho-Twisted Intercalating Nucleic Acids - TINA

    Schneider, Uffe V; Géci, Imrich; Jøhnk, Nina;

    2011-01-01

    . Here, we report the synthesis of a novel ortho-Twisted Intercalating Nucleic Acid (TINA) amidite utilizing the phosphoramidite approach, and examine the stabilizing effect of ortho- and para-TINA molecules in antiparallel DNA duplex formation. In a thermal stability assay, ortho- and para...... analytical sensitivity in a DNA hybridization capture assay targeting the Escherichia coli rrs gene. The corresponding sequence from the Pseudomonas aeruginosa rrs gene was used as cross-reactivity control. At 150 mM ionic strength, analytical sensitivity was improved 27-fold by addition of ortho...... which case they partly concealed ΔTm (most pronounced for para-TINA molecules). We anticipate that the presented rules for placement of TINA molecules will be broadly applicable in hybridization capture assays and target amplification systems....

  3. Phylogenetic group- and species-specific oligonucleotide probes for single-cell detection of lactic acid bacteria in oral biofilms

    Thurnheer Thomas

    2011-01-01

    Full Text Available Abstract Background The purpose of this study was to design and evaluate fluorescent in situ hybridization (FISH probes for the single-cell detection and enumeration of lactic acid bacteria, in particular organisms belonging to the major phylogenetic groups and species of oral lactobacilli and to Abiotrophia/Granulicatella. Results As lactobacilli are known for notorious resistance to probe penetration, probe-specific assay protocols were experimentally developed to provide maximum cell wall permeability, probe accessibility, hybridization stringency, and fluorescence intensity. The new assays were then applied in a pilot study to three biofilm samples harvested from variably demineralized bovine enamel discs that had been carried in situ for 10 days by different volunteers. Best probe penetration and fluorescent labeling of reference strains were obtained after combined lysozyme and achromopeptidase treatment followed by exposure to lipase. Hybridization stringency had to be established strictly for each probe. Thereafter all probes showed the expected specificity with reference strains and labeled the anticipated morphotypes in dental plaques. Applied to in situ grown biofilms the set of probes detected only Lactobacillus fermentum and bacteria of the Lactobacillus casei group. The most cariogenic biofilm contained two orders of magnitude higher L. fermentum cell numbers than the other biofilms. Abiotrophia/Granulicatella and streptococci from the mitis group were found in all samples at high levels, whereas Streptococcus mutans was detected in only one sample in very low numbers. Conclusions Application of these new group- and species-specific FISH probes to oral biofilm-forming lactic acid bacteria will allow a clearer understanding of the supragingival biome, its spatial architecture and of structure-function relationships implicated during plaque homeostasis and caries development. The probes should prove of value far beyond the field of

  4. Cell penetrating peptide delivery of splice directing oligonucleotides as a treatment for Duchenne muscular dystrophy.

    Betts, Corinne A; Wood, Matthew J A

    2013-01-01

    Duchenne muscular dystrophy is a severe, X-linked muscle wasting disorder caused by the absence of an integral structural protein called dystrophin. This is caused by mutations or deletions in the dystrophin gene which disrupt the reading frame, thereby halting the production of a functional protein. A number of potential therapies have been investigated for the treatment of this disease including utrophin upregulation, 'stop-codon read through' aminoglycosides and adeno-associated virus gene replacement as well as stem cell therapy. However, the most promising treatment to date is the use of antisense oligonucleotides which cause exon skipping by binding to a specific mRNA sequence, skipping the desired exon, thereby restoring the reading frame and producing a truncated yet functional protein. The results from recent 2'OMePS and morpholino clinical trials have renewed hope for Duchenne patients; however in vivo studies in a mouse model, mdx, have revealed low systemic distribution and poor delivery of oligonucleotides to affected tissues such as the brain and heart. However a variety of cell penetrating peptides directly conjugated to antisense oligonucleotides have been shown to enhance delivery in Duchenne model systems with improved systemic distribution and greater efficacy compared to 'naked' antisense oligonucleotides. These cell penetrating peptides, combined with an optimised dose and dosing regimen, as well as thorough toxicity profile have the potential to be developed into a promising treatment which may be progressed to clinical trial. PMID:23140454

  5. Nucleic acid-based approaches to STAT inhibition.

    Sen, Malabika; Grandis, Jennifer R

    2012-10-01

    Silencing of abnormally activated genes can be accomplished in a highly specific manner using nucleic acid based approaches. The focus of this review includes the different nucleic acid based inhibition strategies such as antisense oligodeoxynucleotides, small interfering RNA (siRNA), dominant-negative constructs, G-quartet oligonucleotides and decoy oligonucleotides, their mechanism of action and the effectiveness of these approaches to targeting the STAT (signal transducer and activator of transcription) proteins in cancer. Among the STAT proteins, especially STAT3, followed by STAT5, are the most frequently activated oncogenic STATs, which have emerged as plausible therapeutic cancer targets. Both STAT3 and STAT5 have been shown to regulate numerous oncogenic signaling pathways including proliferation, survival, angiogenesis and migration/invasion. PMID:24058785

  6. Survivin antisense compound inhibits proliferation and promotes apoptosis in liver cancer cells

    De-Jian Dai; Cai-De Lu; Ri-Yong Lai; Jun-Ming Guo; Hua Meng; Wei-Sheng Chen; Jun Gu

    2005-01-01

    AIM: To evaluate the effects of survivin on cell proliferation and apoptosis in liver cancer.METHODS: MTT assay was used to generate and optimize phosphorothioate antisense oligonucleotides (ODNs)LipofectamineTM2000 (LiP) compound by varying ODNs (μg):LiP (μL) ratios from 1:0.5 to 1:5. Then, liver cancer cells (HepG2) were transfected with the compound. By using RT-PCR and Western blot, the expression levels of survivin mRNA and proteins were detected in HepG2 cells treated with antisense compounds (ODNs:LiP = 1:4), and compared with those treated with sense compounds (1:4) as control.MTT assay was applied to the determination of cell proliferation in HepG2 cells. Active caspase-3 was evaluated by flow cytometric analysis. The morphological changes were assessed by electron microscopy. Laser scanning confocal microscopy was performed to detect the subcellular localization of survivin proteins in treated and untreated cells.RESULTS: Antisense compounds (1:4) down-regulated survivin expression (mRNA and protein) in a dose-dependent manner with an IC50 of 250 nmol/L. Its maximum effect was achieved at a concentration of 500 nmol/L, at whichmRNA and protein levels were down-regulated by 80%.The similar results were found in MTT assay. Antisense compound (1:4)-treated cells revealed increased caspase3-like protease activity compared with untreated cells.Untreated cells as control were primarily negative for the presence of active-caspase-3. As shown by transmission electron microscopy, treated cells with antisense compounds (1:4) resulted in morphological changes such as blebbing and loss of microvilli, vacuolization in the cytoplasm,condensation of the cytoplasm and nuclei, and fragmented chromatin. Immunofluorescence analysis confirmed the presence of survivin protein pool inside the cytoplasm in untreated cells. Labeled-FITC immunofluorescence staining of survivin clearly showed that survivin was distributed mainly in a spotted form inside the cytoplasm. Whereas

  7. Oligonucleotide-Based Therapy for FTD/ALS Caused by the C9orf72 Repeat Expansion: A Perspective

    Stephanie A. Fernandes

    2013-01-01

    Full Text Available Amyotrophic lateral sclerosis (ALS is a progressive and lethal disease of motor neuron degeneration, leading to paralysis of voluntary muscles and death by respiratory failure within five years of onset. Frontotemporal dementia (FTD is characterised by degeneration of frontal and temporal lobes, leading to changes in personality, behaviour, and language, culminating in death within 5–10 years. Both of these diseases form a clinical, pathological, and genetic continuum of diseases, and this link has become clearer recently with the discovery of a hexanucleotide repeat expansion in the C9orf72 gene that causes the FTD/ALS spectrum, that is, c9FTD/ALS. Two basic mechanisms have been proposed as being potentially responsible for c9FTD/ALS: loss-of-function of the protein encoded by this gene (associated with aberrant DNA methylation and gain of function through the formation of RNA foci or protein aggregates. These diseases currently lack any cure or effective treatment. Antisense oligonucleotides (ASOs are modified nucleic acids that are able to silence targeted mRNAs or perform splice modulation, and the fact that they have proved efficient in repeat expansion diseases including myotonic dystrophy type 1 makes them ideal candidates for c9FTD/ALS therapy. Here, we discuss potential mechanisms and challenges for developing oligonucleotide-based therapy for c9FTD/ALS.

  8. Mucin-mediated nanocarrier disassembly for triggered uptake of oligonucleotides as a delivery strategy for the potential treatment of mucosal tumours

    Martirosyan, A; Olesen, M J; Fenton, R A;

    2015-01-01

    This work demonstrates gastric mucin-triggered nanocarrier disassembly for release of antisense oligonucleotides and consequent unassisted cellular entry as a novel oral delivery strategy. A fluorescence activation-based reporter system was used to investigate the interaction and mucin-mediated d......This work demonstrates gastric mucin-triggered nanocarrier disassembly for release of antisense oligonucleotides and consequent unassisted cellular entry as a novel oral delivery strategy. A fluorescence activation-based reporter system was used to investigate the interaction and mucin...

  9. Oligonucleotide delivery with cell surface binding and cell penetrating Peptide amphiphile nanospheres.

    Mumcuoglu, Didem; Sardan, Melis; Tekinay, Turgay; Guler, Mustafa O; Tekinay, Ayse B

    2015-05-01

    A drug delivery system designed specifically for oligonucleotide therapeutics can ameliorate the problems associated with the in vivo delivery of these molecules. The internalization of free oligonucleotides is challenging, and cytotoxicity is the main obstacle for current transfection vehicles. To develop nontoxic delivery vehicles for efficient transfection of oligonucleotides, we designed a self-assembling peptide amphiphile (PA) nanosphere delivery system decorated with cell penetrating peptides (CPPs) containing multiple arginine residues (R4 and R8), and a cell surface binding peptide (KRSR), and report the efficiency of this system in delivering G-3129, a Bcl-2 antisense oligonucleotide (AON). PA/AON (peptide amphiphile/antisense oligonucleotide) complexes were characterized with regards to their size and secondary structure, and their cellular internalization efficiencies were evaluated. The effect of the number of arginine residues on the cellular internalization was investigated by both flow cytometry and confocal imaging, and the results revealed that uptake efficiency improved as the number of arginines in the sequence increased. The combined effect of cell penetration and surface binding property on the cellular internalization and its uptake mechanism was also evaluated by mixing R8-PA and KRSR-PA. R8 and R8/KRSR decorated PAs were found to drastically increase the internalization of AONs compared to nonbioactive PA control. Overall, the KRSR-decorated self-assembled PA nanospheres were demonstrated to be noncytotoxic delivery vectors with high transfection rates and may serve as a promising delivery system for AONs. PMID:25828697

  10. Chemical Modifications of Antisense Morpholino Oligomers Enhance Their Efficacy against Ebola Virus Infection▿

    Swenson, Dana L.; Warfield, Kelly L.; Warren, Travis K.; Lovejoy, Candace; Hassinger, Jed N.; Ruthel, Gordon; Blouch, Robert E; Moulton, Hong M; Weller, Dwight D.; Iversen, Patrick L.; Bavari, Sina

    2009-01-01

    Phosphorodiamidate morpholino oligomers (PMOs) are uncharged nucleic acid-like molecules designed to inactivate the expression of specific genes via the antisense-based steric hindrance of mRNA translation. PMOs have been successful at knocking out viral gene expression and replication in the case of acute viral infections in animal models and have been well tolerated in human clinical trials. We propose that antisense PMOs represent a promising class of therapeutic agents that may be useful ...

  11. Inhibition of HSP70 Gene Expression by Modified Antisense and Its Effects on Embryonic Sensitivity to Heat Shock

    TIAN Wen-ru; DU Li-yin; HE Jian-bin; LI Shou-jun

    2004-01-01

    Experiments were performed to evaluate the efficiency of inhibition of HSP70 gene expression by antisense oligonucleotides complementary to the mRNA of HSP70 and to test the effects of inhibition of HSP70 gene expression on subsequent embryonic sensitivity to heat shock. The results showed that transfection of pre-implantation embryos at 4-cell stage with 5 μM antisense oligo had no effect on in vitro blastocyst development. However, transfection with 10 to 40 μM antisense oligo had reduced in vitro blastocyst development to 15, 10% and 0; For the embryos which exposed to 40 μM As arrested at the 16-cell stage, there was no blastocyst formation within the heat shock groups. In contrast, transfection had no effect on embryonic sensitivity to heat shock, above 25% of embryos developed to blastocyst stage in control groups.

  12. Enzymatic synthesis of modified oligonucleotides by PEAR using Phusion and KOD DNA polymerases.

    Wang, Xuxiang; Zhang, Jianye; Li, Yingjia; Chen, Gang; Wang, Xiaolong

    2015-02-01

    Antisense synthetic oligonucleotides have been developed as potential gene-targeted therapeutics. We previously reported polymerase-endonuclease amplification reaction (PEAR) for amplification of natural and 5'-O-(1-thiotriphosphate) (S)-modified oligonucleotides. Here, we extended the PEAR technique for enzymatic preparation of 2'-deoxy-2'-fluoro-(2'-F) and 2'-F/S double-modified oligonucleotides. The result showed that KOD and Phusion DNA polymerase could synthesize oligonucleotides with one or two modified nucleotides, and KOD DNA polymerase is more suitable than Phusion DNA polymerase for PEAR amplification of 2'-F and 2'-F/S double modified oligonucleotides. The composition of PEAR products were analyzed by electrospray ionization liquid chromatography mass spectrometry (ESI/LC/MS) detection and showed that the sequence of the PEAR products are maintained at an extremely high accuracy (>99.9%), and after digestion the area percent of full-length modified oligonucleotides reaches 89.24%. PEAR is suitable for synthesis of modified oligonucleotides efficiently and with high purity. PMID:25517220

  13. Inhibitory effects of antisense phosphorothioate oligodeoxynucleotides on pancreatic cancer cell Bxpc-3 telomerase activity and cell growth in vitro

    Yun-Feng Wang; Ke-Jian Guo; Bei-Ting Huang; Yong Liu; Xiao-Yun Tang; Jian-Jun Zhang; Qiang Xia

    2006-01-01

    AIM: To investigate the effect of telomerase hTERT gene antisense oligonucleotide (hTERT-ASO) on proliferation and telomerase activity of pancreatic cancer cell line Bxpc-3.METHODS: MTT assay was used to detect the effect of different doses of hTERT-ASO on proliferation of Bxpc-3 cell for different times. To study the anti-tumor activity,the cells were divided into there groups: Control group (pancreatic cancer cell Bxpc-3); antisense oligonucleotide (hTERT-ASO) group; and nosense oligonucleotide group decorated with phosphorothioate. Telomerase activity was detected using TRAP-PCR-ELISA. Cell DNA distribution was examined using flow cytometry assay.Cell apoptosis was observed by transmission electron microscope in each group.RESULTS: After treatment with 6 mmol/L hTERTASO, cell proliferation was inhibited in dose- and timedependent manner. The telomerase activity decreased after treatment with hTERT-ASO for 72 h. Flow cytometry showed the cell number of G0/G1 phase increased from 2.7% to 14.7%, the cell number of S phase decreased from 72.7% to 51.0%, and a sub-G1 stage cell apoptosis peak appeared in front of G1 stage.CONCLUSION: Telomerase antisense oligodeoxynucleotide can inhibit the proliferation of pancreatic cancer cell line Bxpc-3 and decrease the telomerase activity and increase cell apoptosis rate in vitro.

  14. Amplification-Free Detection of Circulating microRNA Biomarkers from Body Fluids Based on Fluorogenic Oligonucleotide-Templated Reaction between Engineered Peptide Nucleic Acid Probes: Application to Prostate Cancer Diagnosis.

    Metcalf, Gavin A D; Shibakawa, Akifumi; Patel, Hinesh; Sita-Lumsden, Ailsa; Zivi, Andrea; Rama, Nona; Bevan, Charlotte L; Ladame, Sylvain

    2016-08-16

    Highly abundant in cells, microRNAs (or miRs) play a key role as regulators of gene expression. A proportion of them are also detectable in biofluids making them ideal noninvasive biomarkers for pathologies in which miR levels are aberrantly expressed, such as cancer. Peptide nucleic acids (PNAs) are engineered uncharged oligonucleotide analogues capable of hybridizing to complementary nucleic acids with high affinity and high specificity. Herein, novel PNA-based fluorogenic biosensors have been designed and synthesized that target miR biomarkers for prostate cancer (PCa). The sensing strategy is based on oligonucleotide-templated reactions where the only miR of interest serves as a matrix to catalyze an otherwise highly unfavorable fluorogenic reaction. Validated in vitro using synthetic RNAs, these newly developed biosensors were then shown to detect endogenous concentrations of miR in human blood samples without the need for any amplification step and with minimal sample processing. This low-cost, quantitative, and versatile sensing technology has been technically validated using gold-standard RT-qPCR. Compared to RT-qPCR however, this enzyme-free, isothermal blood test is amenable to incorporation into low-cost portable devices and could therefore be suitable for widespread public screening. PMID:27498854

  15. Synthesis of 5'-Aldehyde Oligonucleotide.

    Lartia, Rémy

    2016-01-01

    Synthesis of oligonucleotide ending with an aldehyde functional group at their 5'-end (5'-AON) is possible for both DNA (5'-AODN) and RNA (5'-AORN) series irrespectively of the nature of the last nucleobase. The 5'-alcohol of on-support ODN is mildly oxidized under Moffat conditions. Transient protection of the resulting aldehyde by N,N'-diphenylethylenediamine derivatives allows cleavage, deprotection, and RP-HPLC purification of the protected 5'-AON. Finally, 5'-AON is deprotected by usual acetic acid treatment. In the aggregates, 5'-AON can be now synthesized and purified as routinely as non-modified ODNs, following procedures similar to the well-known "DMT-On" strategy. PMID:26967469

  16. Nano and Microtechnologies for the Delivery of Oligonucleotides with Gene Silencing Properties

    Giuseppe De Rosa

    2009-07-01

    Full Text Available Oligonucleotides (ONs are synthetic fragments of nucleic acid designed to modulate the expression of target proteins. DNA-based ONs (antisense, antigene, aptamer or decoy and more recently a new class of RNA-based ONs, the small interfering RNAs (siRNAs, have gained great attention for the treatment of different disease states, such as viral infections, inflammation, diabetes, and cancer. However, the development of therapeutic strategies based on ONs is hampered by their low bioavailability, poor intracellular uptake and rapid degradation in biological fluids. The use of a non-viral carrier can be a powerful tool to overcome these drawbacks. Lipid or polymer-based nanotechnologies can improve biological stability and cellular uptake of ONs, with possibility of tissue and/or cellular targeting. The use of polymeric devices can also produce a prolonged release of the ON, thus reducing the need of frequent administrations. This review summarizes advantages and issues related to the main non-viral vectors used for ON delivery.

  17. Rational design of point mutation-selective antisense DNA targeted to codon 12 of Ha-ras mRNA in human cells.

    Duroux, I; Godard, G; Boidot-Forget, M; Schwab, G; Hélène, C; Saison-Behmoaras, T

    1995-09-11

    Antisense oligodeoxynucleotides targeted to Ha-ras mRNA have been designed to discriminate between the codon 12-mutated oncogene and the normal proto-oncogene. An in vitro assay using two different sources of RNase H (rabbit reticulocyte lysates and nuclear extract from HeLa cells) was used to characterize oligonucleotide binding to normal and mutated Ha-ras mRNA. Short oligonucleotides (12- or 13mers) centered on the mutation had a very high discriminatory efficiency. Longer oligonucleotides (16mers) did not discriminate efficiently between the mutated and the normal mRNA. We have tested the efficacy of dodecanucleotides to induce RNase H cleavage of the full-length mRNA, moving the target sequence from the loop to the stem region which is formed in the vicinity of mutated codon 12. The most selective oligonucleotides were centered on the mutation which is located near the junction between the loop and stem regions even though they were less efficient at inducing RNase H cleavage than those targeted to the loop region. The 12mer antisense oligonucleotide with the highest discriminatory power was selected for cell culture studies. This oligonucleotide inhibited the proliferation of a human cell line which had been transformed with the mutated Ha-ras gene (HBL100ras1) but had no effect on the parental cell line which was transfected with the vector DNA (HBL 100neo) and expressed only the normal Ha-ras gene. Growth inhibition of HBL100ras1 cells was associated with specific ablation of targeted Ha-ras mRNA as shown by RT-PCR. These results show that 'in vitro' evaluation using an RNase H assay allowed us to select an antisense oligonucleotide which elicited a selectivity towards point-mutated Ha-ras mRNA when added at 10 microM concentration to the culture medium of cells expressing wild type and mutated Ha-ras mRNA. PMID:7567450

  18. Intercalator conjugates of pyrimidine locked nucleic acid-modified triplex-forming oligonucleotides: improving DNA binding properties and reaching cellular activities

    Brunet, Erika; Corgnali, Maddalena; Perrouault, Loïc; Roig, Victoria; Asseline, Ulysse; Sørensen, Mads D.; Babu, B. Ravindra; Wengel, Jesper; Giovannangeli, Carine

    2005-01-01

    Triplex-forming oligonucleotides (TFOs) are powerful tools to interfere sequence-specifically with DNA-associated biological functions. (A/T,G)-containing TFOs are more commonly used in cells than (T,C)-containing TFOs, especially C-rich sequences; indeed the low intracellular stability of the non-covalent pyrimidine triplexes make the latter less active. In this work we studied the possibility to enhance DNA binding of (T,C)-containing TFOs, aiming to reach cellular activities; to this end, ...

  19. Electron migration in oligonucleotides upon γ-irradiation in solution

    Electron migration in irradiated solutions of DNA was investigated using 5-bromouracil synthetically incorporated into oligonucleotides of defined base composition as a molecular indicator of electron interactions. Solvated electrons interact quantitatively with 5-bromouracil, leading to a highly reactive 5-yl radical which can abstract an adjacent hydrogen atom to yield uracil. Yields of uracil, or loss of 5-bromouracil, from irradiated oligonucleotide samples were measured using gas chromatography-mass spectrometric analysis of their trimethylsilylated acid hydrolysates. (author)

  20. Water-absorbent polymer as a carrier for a discrete deposit of antisense oligodeoxynucleotides in the central nervous system.

    Bannai, M; Ichikawa, M; Nishimura, F; Nishihara, M; Takahashi, M

    1998-09-01

    One of the problems of introducing antisense oligodeoxynucleotides (ODN) into the central nervous system (CNS) is their rapid disappearance from the target site due to their dispersion and diffusion, which results in poor uptake and/or retention in cells (M. Morris, A.B. Lucion, Antisense oligonucleotides in the study of neuroendocrine systems, J. Neuroendocrinol. 7 (1995) 493-500; S. Ogawa, H.E. Brown, H.J. Okano, D.W. Pfaff, Cellular uptake of intracerebrally administrated oligodeoxynucleotides in mouse brain, Regul. Pept. 59 (1995) 143-149) [2,5]. Recently, we adapted a new method using water-absorbent polymer (WAP; internally cross-linked starch-grafted-polyacrylates) as a carrier for antisense ODN. The polymer forms a hydro-gel after absorbing water which is chemically and biologically inert. In these studies, the polymer (powder-form) is fully swollen by physiological saline containing antisense ODN (0.2 micromol/ml) to make 80-fold volume gel. Hydro-gel (1 microliter) is injected into the target site, and water solutes are assumed to be diffused stoichiometrically into CNS from the surface of the gel. Histological studies indicate that 24 h after the injection, antisense ODN (5'biotinylated-S-oligos of 15 mer) are distributed to within 800 micrometer from the edge of the area where the gel is located and then gradually disappear from this area within days, but still remain within 300-micrometer distance 7 days later. Antisense ODN are effectively incorporated by all the cell types examined, i.e., neurons, astrocytes and microglias, and suppress the synthesis of the target protein. This method can be adapted to slow delivery of antisense ODN and other water soluble substances into the CNS. PMID:9767125

  1. Antisense PMO found in dystrophic dog model was effective in cells from exon 7-deleted DMD patient.

    Takashi Saito

    Full Text Available BACKGROUND: Antisense oligonucleotide-induced exon skipping is a promising approach for treatment of Duchenne muscular dystrophy (DMD. We have systemically administered an antisense phosphorodiamidate morpholino oligomer (PMO targeting dystrophin exons 6 and 8 to a dog with canine X-linked muscular dystrophy in Japan (CXMD(J lacking exon 7 and achieved recovery of dystrophin in skeletal muscle. To date, however, antisense chemical compounds used in DMD animal models have not been directly applied to a DMD patient having the same type of exon deletion. We recently identified a DMD patient with an exon 7 deletion and tried direct translation of the antisense PMO used in dog models to the DMD patient's cells. METHODOLOGY/PRINCIPAL FINDINGS: We converted fibroblasts of CXMD(J and the DMD patient to myotubes by FACS-aided MyoD transduction. Antisense PMOs targeting identical regions of dog and human dystrophin exons 6 and 8 were designed. These antisense PMOs were mixed and administered as a cocktail to either dog or human cells in vitro. In the CXMD(J and human DMD cells, we observed a similar efficacy of skipping of exons 6 and 8 and a similar extent of dystrophin protein recovery. The accompanying skipping of exon 9, which did not alter the reading frame, was different between cells of these two species. CONCLUSION/SIGNIFICANCE: Antisense PMOs, the effectiveness of which has been demonstrated in a dog model, achieved multi-exon skipping of dystrophin gene on the FACS-aided MyoD-transduced fibroblasts from an exon 7-deleted DMD patient, suggesting the feasibility of systemic multi-exon skipping in humans.

  2. Retinoic acid signaling acts via Hox1 to establish the posterior limit of the pharynx in the chordate amphioxus

    Schubert, Michael; Yu, Jr-Kai; Holland, Nicholas D; Escriva, Hector; Laudet, Vincent; Holland, Linda Z

    2004-01-01

    In the invertebrate chordate amphioxus, as in vertebrates, retinoic acid (RA) specifies position along the anterior/posterior axis with elevated RA signaling in the middle third of the endoderm setting the posterior limit of the pharynx. Here we show that AmphiHox1 is also expressed in the middle third of the developing amphioxus endoderm and is activated by RA signaling. Knockdown of AmphiHox1 function with an antisense morpholino oligonucleotide shows that AmphiHox1 mediates the role of RA ...

  3. LNA-antisense rivals siRNA for gene silencing

    Jepsen, Jan Stenvang; Wengel, Jesper; Stenvang, Jan

    2004-01-01

    Locked nucleic acid (LNA) is a class of nucleic acid analogs possessing unprecedented binding affinity toward complementary DNA and RNA while obeying the Watson-Crick base-pairing rules. For efficient gene silencing in vitro and in vivo, fully modified or chimeric LNA oligonucleotides have been...... phosphorothioate-DNA segment flanked by LNA gaps, rivals siRNA as the technology of choice for target validation and therapeutic applications....

  4. Nucleic Acids in Human Glioma Treatment: Innovative Approaches and Recent Results

    S. Catuogno

    2012-01-01

    Full Text Available Gliomas are the most common primary central nervous system tumors with a dismal prognosis. Despite recent advances in surgery, radiotherapy, and chemotherapy, current treatment regimens have a modest survival benefit. A crucial challenge is to deliver drugs effectively to invasive glioma cells residing in a sanctuary within the central nervous system. New therapies are essential, and oligonucleotide-based approaches, including antisense, microRNAs, small interfering RNAs, and nucleic acid aptamers, may provide a viable strategy. Thanks to their unique characteristics (low size, good affinity for the target, no immunogenicity, chemical structures that can be easily modified to improve their in vivo applications, these molecules may represent a valid alternative to antibodies particularly to overcome challenges presented by the blood-brain barrier. Here we will discuss recent results on the use of oligonucleotides that will hopefully provide new effective treatment for gliomas.

  5. Effects of Peptide Nucleic Acids against Ki-67 Gene on the Proliferation and Apoptosis of Human Renal Carcinoma Cell Line

    2006-01-01

    To investigate the effects of anti-sense peptide nucleic acids (PNAs) targeting Ki-67gene on modulation of the proliferation and apoptosis of human renal carcinoma cell lines, human renal carcinoma cell line 786-0 cells were treated with anti-sense PNAs at different concentrations (1.0 μmol/L, 2.0 μmol/L, 10.0 μmol/L). The Ki-67 expression of 786-0 cells was detected by immunohistochemical technique and Western blot method respectively. The proliferation of 786-0 cells was studied by cell growth curves and 3H-thymidine incorporation. The apoptosis of 786-0 cells was detected by TUNEL assay. The control groups were treated with anti-sense oligonucleotide (ASODNs)targeting Ki-67 gene. Our results showed that the Ki-67 expression of 786-0 cells treated with anti-sense PNAs (16.9±0.7) was significantly inhibited as compared with that of the control groups (28.6±0.4) (P<0.01). The Ki-67 protein rate of 786-0 cells treated with anti-sense PNAs (42.1±2.2)was significantly reduced when compared with that of the control groups (83.6±1.4) (P<0.01). Proliferation of 786-0 cells treated with anti-sense PNAs (20.7±1.5) was significantly inhibited as compared with that of the control groups (58.6±1.4) (P<0.01). The apoptosis rate of 786-0 cells treated with anti-sense PNAs (28.7±2.3) was significantly increased higher compared with that of the control groups (13.8±1.0) (P<0.01). From these finds we are led to conclude that anti-sense PNAs targeting Ki-67 gene have stronger effects on the inhibition of the proliferation and induction of apoptosis of human renal carcinoma cells than ASODNs targeting Ki-67 gene. The strategies using anti-sense PNAs targeting Ki-67 gene may be a promising approach for the treatment of renal cell carcinoma.

  6. AMO-miR-204 antisense oligonucleotides enhance the sensitivity of MOLT-4 cells to matrine%Hsa-miR-204反义核酸提高MOLT-4细胞对苦参碱的敏感性研究

    孙文洪; 何金花; 韩泽平; 黄国贤; 朱丽梨; 何琨仪; 陈炳豪

    2014-01-01

    目的 研究miR-204的反义核酸(anti-miR204 oligonucleotides,AMO-miR-204)联合苦参碱观察其对人急性淋巴细胞白血病细胞株(MOLT-4)生长与凋亡的影响及机制.方法 将一定浓度的人工合成的AMO-miR-204经脂质体包裹转染MOLT-4细胞,并联合不同浓度的苦参碱作用于MOLT-4细胞48 h后,采用MTT法检测单用AMO-miR-204、单用苦参碱及AMO-miR-204联合苦参碱对MOLT-4细胞增殖抑制作用,流式细胞术检测细胞早期凋亡率;实时荧光定量RT-PCR检测细胞 Bcl-2mRNA 的表达水平;克隆形成抑制实验检测克隆形成能力.结果单用苦参碱的IC50为0.75 mg·L-1;苦参碱与阴性对照联合使用,IC50为0.29 mg·L-1,表现为相加作用;苦参碱与AMO- miR-204联合使用,IC50为0.07 mg·L-1,增敏倍数为10.7,表现为协同作用.流式细胞术结果显示:联合组比单用组早期凋亡率明显增高,凋亡率达25.4%.单用AMO-miR-204、苦参碱及两者联均能下调 Bcl-2mRNA基因的表达水平,对MOLT-4细胞克隆形成逐渐减小,其中两者联合的克隆数为(28±3.0).结论 AMO- miR-204可提高MOLT-4细胞对苦参碱的敏感性,其机制可能为通过下调Bcl-2 mRNA的表达水平,促进MOLT-4细胞早期凋亡,并抑制其克隆形成有关.

  7. Pip6-PMO, A New Generation of Peptide-oligonucleotide Conjugates With Improved Cardiac Exon Skipping Activity for DMD Treatment

    Betts, Corinne; Saleh, Amer F.; Arzumanov, Andrey A; Hammond, Suzan M.; Godfrey, Caroline; Coursindel, Thibault; Gait, Michael J.; Wood, Matthew JA

    2012-01-01

    Antisense oligonucleotides (AOs) are currently the most promising therapeutic intervention for Duchenne muscular dystrophy (DMD). AOs modulate dystrophin pre-mRNA splicing, thereby specifically restoring the dystrophin reading frame and generating a truncated but semifunctional dystrophin protein. Challenges in the development of this approach are the relatively poor systemic AO delivery and inefficient dystrophin correction in affected non-skeletal muscle tissues, including the heart. We hav...

  8. Antisense mediated splicing modulation for inherited metabolic diseases: challenges for delivery.

    Pérez, Belen; Vilageliu, Lluisa; Grinberg, Daniel; Desviat, Lourdes R

    2014-02-01

    In the past few years, research in targeted mutation therapies has experienced significant advances, especially in the field of rare diseases. In particular, the efficacy of antisense therapy for suppression of normal, pathogenic, or cryptic splice sites has been demonstrated in cellular and animal models and has already reached the clinical trials phase for Duchenne muscular dystrophy. In different inherited metabolic diseases, splice switching oligonucleotides (SSOs) have been used with success in patients' cells to force pseudoexon skipping or to block cryptic splice sites, in both cases recovering normal transcript and protein and correcting the enzyme deficiency. However, future in vivo studies require individual approaches for delivery depending on the gene defect involved, given the different patterns of tissue and organ expression. Herein we review the state of the art of antisense therapy targeting RNA splicing in metabolic diseases, grouped according to their expression patterns-multisystemic, hepatic, or in central nervous system (CNS)-and summarize the recent progress achieved in the field of in vivo delivery of oligonucleotides to each organ or system. Successful body-wide distribution of SSOs and preferential distribution in the liver after systemic administration have been reported in murine models for different diseases, while for CNS limited data are available, although promising results with intratechal injections have been achieved. PMID:24506780

  9. Detection and Enumeration of Methanotrophs in Acidic Sphagnum Peat by 16S rRNA Fluorescence In Situ Hybridization, Including the Use of Newly Developed Oligonucleotide Probes for Methylocella palustris

    Dedysh, Svetlana N.; Derakshani, Manigee; Liesack, Werner

    2001-01-01

    Two 16S rRNA-targeted oligonucleotide probes, Mcell-1026 and Mcell-181, were developed for specific detection of the acidophilic methanotroph Methylocella palustris using fluorescence in situ hybridization (FISH). The fluorescence signal of probe Mcell-181 was enhanced by its combined application with the oligonucleotide helper probe H158. Mcell-1026 and Mcell-181, as well as 16S rRNA oligonucleotide probes with reported group specificity for either type I methanotrophs (probes M-84 and M-705...

  10. TCP1 complex proteins interact with phosphorothioate oligonucleotides and can co-localize in oligonucleotide-induced nuclear bodies in mammalian cells

    Liang, Xue-hai; Shen, Wen; Sun, Hong; Prakash, Thazha P.; Crooke, Stanley T.

    2014-01-01

    Phosphorothioate (PS) antisense oligonucleotides (ASOs) have been successfully developed as drugs to reduce the expression of disease-causing genes. PS-ASOs can be designed to induce degradation of complementary RNAs via the RNase H pathway and much is understood about that process. However, interactions of PS-ASOs with other cellular proteins are not well characterized. Here we report that in cells transfected with PS-ASOs, the chaperonin T-complex 1 (TCP1) proteins interact with PS-ASOs and...