کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2007365 1066372 2008 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
In vitro metabolic stability of obestatin: Kinetics and identification of cleavage products
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی زیست شیمی
پیش نمایش صفحه اول مقاله
In vitro metabolic stability of obestatin: Kinetics and identification of cleavage products
چکیده انگلیسی

The in vitro metabolic stability testing on synthetic obestatin peptides from two different species (human hOb and mouse mOb) using HPLC analysis is described. A reversed-phase C18 column of 300 Å pore size was used, with a gradient system based on aqueous formic acid and acetonitrile. Electrospray ionization (ESI) ion trap mass spectrometry was used for identification of the chromatographic eluting peptide metabolic products, while UV (DAD) and fluorescence served quantitative purposes. Differences in the metabolic degradation kinetics of hOb and mOb were found in plasma, liver and kidney homogenate, with half-lives ranging between 12.6 and 138.0 min. Proteolytic hydrolysis at the N-terminal Phe residue and cleavage at Pro4–Phe5 were found to be two major metabolic pathways, accounting for more than 50% of the metabolic degradation. Several other labile peptide bonds were located. The influence of a standard protease inhibitor cocktail was investigated, as well as the metabolism of iodinated human obestatin in liver homogenate. Our results indicate that the major instability of obestatin peptides, as currently used in biomedical investigations, should be taken into account in the interpretation of the obtained results.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Peptides - Volume 29, Issue 10, October 2008, Pages 1740–1748
نویسندگان
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