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首页> 外文期刊>Journal of Leukocyte Biology: An Official Publication of the Reticuloendothelial Society >Activation of macrophages by gliadin fragments: isolation and characterization of active peptide.
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Activation of macrophages by gliadin fragments: isolation and characterization of active peptide.

机译:麦醇溶蛋白片段活化巨噬细胞:活性肽的分离和表征。

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摘要

Celiac disease, induced by dietary gluten, is characterized by mucosal atrophy and local inflammation associated with cell infiltration and activation. Unlike other food proteins, gluten and its proteolytic fragments, besides inducing a specific immune response, were shown to activate components of innate immunity and cause, e.g., direct stimulation of TNF-alpha and IL-10 and a significant rise in NO production by peritoneal macrophages. The identity of the active fragments was established by separating the peptic digest of gliadin by RP-HPLC chromatography. The purest fraction with the highest activity was analyzed by mass spectrometry, and the gliadin peptide sequence was identified as VSFQQPQQQYPSSQ. This peptide (T) and its N- and C-terminally shortened forms (A, B, C and D, E, F) were synthesized. Peptide B (FQQPQQQYPSSQ) elicited the highest TNF-alpha, IL-10, and RANTES secretion and increase in IFN-gamma-primed NO production by mouse macrophages. In contrast, C-terminally shortened peptides had a lower ability to stimulate macrophages than the native form.
机译:由饮食面筋引起的乳糜泻的特征在于粘膜萎缩和与细胞浸润和活化有关的局部炎症。与其他食物蛋白质不同,面筋及其蛋白水解片段除了诱导特异性免疫反应外,还可以激活先天免疫的成分并引起例如直接刺激TNF-α和IL-10以及腹膜NO产生显着增加。巨噬细胞。通过RP-HPLC色谱分离麦醇溶蛋白的消化消化物来建立活性片段的身份。通过质谱分析活性最高的最纯级分,并将麦醇溶蛋白肽序列鉴定为VSFQQPQQQYPSSQ。合成了该肽(T)及其N和C端的缩短形式(A,B,C和D,E,F)。肽B(FQQPQQQYPSSQ)引起最高的TNF-α,IL-10和RANTES分泌,并增加了小鼠巨噬细胞产生的IFN-γ引发的NO。相反,C末端缩短的肽刺激巨噬细胞的能力低于天然形式。

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