کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2505066 1557476 2009 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Chitosan formulations improve the immunogenicity of a GnRH-I peptide-based vaccine
موضوعات مرتبط
علوم پزشکی و سلامت داروسازی، سم شناسی و علوم دارویی علوم دارویی
پیش نمایش صفحه اول مقاله
Chitosan formulations improve the immunogenicity of a GnRH-I peptide-based vaccine
چکیده انگلیسی

Peptide vaccines using specific antigens with poor immunogenicity like GnRH-I are unable to develop an effective adaptive immune response and require the presence of adjuvants, essential to lymphocytic activation.Three chitosan formulations were evaluated for their ability as adjuvant of a poor immunogenic peptide vaccine against GnRH-I. Male Sprague–Dawley rats were immunized subcutaneously with recombinant His-GnRH-tandem-repeat peptide in high, low and phosphorylated high molecular weight chitosan solution at 0.5% (w/v). Freund's complete adjuvant was used as a positive control of immune response. Our results suggest that different chitosan formulations as adjuvant, with high or low viscosity degree allow inducing a high and persistent immune response against a poor immunogenic recombinant peptide. We found that the immune response was mediated by a increasing of IgG isotype 1, which were significantly greater than levels presented by the animals immunized with Freund's complete adjuvant. Nevertheless, chitosan with low molecular weight and highest acetylation degree was able to induce an immune response mediated by IgG isotype 2a. Additionally, high molecular weight phosphorylated chitosan, in which the phosphate groups were linked to N-acetyl-d-glucosamine unit, the immune response was reduced. All the immune responses obtained with chitosan as adjuvant were able to neutralize effectively the GnRH hormone proves by reducing of animal steroidogenesis and spermatogenesis demonstrating its capacity to improve immunogenicity in peptide vaccine.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Pharmaceutics - Volume 369, Issues 1–2, 18 March 2009, Pages 64–71
نویسندگان
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