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合成Exendin-4的体外人血浆稳定性研究

陈洁, 李惟, 喻凌, 王丽萍   

  1. 吉林大学生命科学学院生物大分子实验室, 长春 130021
  • 收稿日期:2006-07-01 修回日期:1900-01-01 出版日期:2007-04-10 发布日期:2007-04-10
  • 通讯作者: 王丽萍

Stability of Synthetic Exendin-4 in Human Plasma in Vitro

CHEN Jie, LI Wei, YU Ling, WANG Li-Ping*   

  1. College of Life Science, Jilin University, Changchun 130023, China
  • Received:2006-07-01 Revised:1900-01-01 Online:2007-04-10 Published:2007-04-10
  • Contact: WANG Li-Ping

摘要: 为了解决Ⅱ型糖尿病患者注射用药频繁的问题, 需要比Exendin-4更加稳定的GLP-1的激动剂, 本文的研究目的是找到Exendin-4较易水解的氨基酸位点, 为设计新的长效的Exendin-4模拟肽提供相关信息.

关键词: Exendin-4, 胰高血糖素样肽-1, 二肽基肽酶, 稳定性

Abstract: Synthetic exendin-4 exhibits dose-dependent glucose-regulatory activity similar to that of native glucagon-like peptide-1(GLP-1). Moreover, exendin-4 is resistant to degradation by dipeptidyl peptidase-Ⅳ(DPP-Ⅳ) while GLP-1 is degraded by DPP-Ⅳ with a half-life of less than 2 min in mammals. In this study the stability of exendin-4 in human plasma was evaluated in vitro. Exendin-4 was incubated in plasma at 37 ℃, extracted and subsequently analyzed by using high performance liquid chromatography(HPLC). Exendin-4 was slowly broken down in plasma. Its half-life time is 9.57 h. The degradation products were identified by mass-spectrum(MS). According to natural sequence of exendin-4, we deduced that the cleavage were between the Thr5 and Phe6 bond, Phe6 and Thr7 bond, and Thr7 and Ser8 bond of the N-terminus region of the peptide, and the results of ESI-TOF-MS prove that our primary conclusion was correct.

Key words: Exendin-4, Glucagon-like peptide, Dipeptidyl peptidase-Ⅳ, Stability

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