Identification of peptide mimetics of xenoreactive α-Gal antigenic epitope by phage display

被引：22

作者：

Lang, HS ^{[1
]}

Zhan, JB ^{[1
]}

Xu, LH ^{[1
]}

Yan, ZK ^{[1
]}

机构：

[1] Zhejiang Univ, Dept Biochem, Sch Med, Hangzhou 310006, Peoples R China

来源：

BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS | 2006年 / 344卷 / 01期

基金：

中国国家自然科学基金;

关键词：

peptide mimics; xenoreactive antigen; xenotransplantation; phage display;

D O I：

10.1016/j.bbrc.2006.03.112

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

The prevention of hyperacute rejection (HAR) triggered by interaction between the human natural antibody and xenoreactive antigenic epitope (Gal-alpha 1,3Gal) present on pig cells is the key to Success in pig-to-human xenotransplantation. The phage display technology offers an effective strategy for screening peptides which can interact with the anti-Gal antibody to block alpha-Gal antigen binding site. Two peptide libraries, linear 7 peptide library and C7C library, were panned on the anti-B monoclonal antibody which has the characteristic of binding to the alpha-Gal antigenic epitope. After four rounds of panning, 22 positive phage clones were selected. Highly homologous sequence PT and STL existed among these selected peptides. Stachyose competitive ELISAs revealed that these peptides specifically bound to alpha-Gal antigen binding site. Eight peptide mimics of alpha-Gal antigenic epitope could inhibit the agglutination of pig red blood cells mediated by human sera in a dose-dependent manner. These results demonstrated that the selected peptides can mimic the conformational structure of alpha-Gal antigenic epitope and have the therapeutic potential in xenotransplantation. (c) 2006 Elsevier Inc. All rights reserved.

引用

页码：214 / 220

页数：7