کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2008103 1066397 2008 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A peptide of the phylloseptin family from the skin of the frog Hylomantis lemur (Phyllomedusinae) with potent in vitro and in vivo insulin-releasing activity
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی زیست شیمی
پیش نمایش صفحه اول مقاله
A peptide of the phylloseptin family from the skin of the frog Hylomantis lemur (Phyllomedusinae) with potent in vitro and in vivo insulin-releasing activity
چکیده انگلیسی

A peptide with the ability to release insulin from the rat BRIN-BD11 clonal β cell line was isolated from norepinephrine-stimulated skin secretions of the Lemur leaf frog Hylomantis lemur Boulenger,1882. Determination of the primary structure (FLSLIPHVISALSSL.NH2) demonstrated that the peptide belongs to the phylloseptin family whose members have previously been identified in other Phyllomedusinae species. A synthetic replicate of the peptide, termed phylloseptin-L2, produced a significant stimulation of insulin release (134% of basal rate, P < 0.01) from BRIN-BD11 cells at a concentration of 30 nM, with a maximum response (301% of basal rate, P < 0.001) at a concentration of 3 μM. Phylloseptin-L2 did not stimulate release of the cytosolic enzyme, lactate dehydrogenase at concentrations up to 3 μM, indicating that the integrity of the plasma membrane had been preserved. The stimulatory action was maintained in the absence of extracellular Ca2+ and in the presence of verapamil (50 μM) and diazoxide (300 μM) suggesting that mechanism of action of the peptide did not primarily involve influx of Ca2+ or closure of ATP-sensitive K+ channels. Administration of phylloseptin-L2 (50 nmol/kg body weight) into mice significantly (P < 0.05) increased total release of insulin and improved glucose tolerance during the 60 min period following an intraperitoneal injection of glucose (18 mmol/kg body weight). It is concluded that the peptide shows potential for development into a therapeutically valuable agent for the treatment of Type 2 diabetes.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Peptides - Volume 29, Issue 12, December 2008, Pages 2136–2143
نویسندگان
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