Effects of Neuregulins on Invasion and Metastasis of Non-overexpression ErbB2 Breast Cancer Cells

作     者：Ya-mei Zhang Ting-ting Zhao Hua-yu Deng 

作者机构：Laboratory of Stem Cell and Tissue Engineering Chongqing Medical University Chongqing 400016 China 

出 版 物：《Chinese Journal of Cancer Research》 (中国癌症研究（英文版）)

年 卷 期：2009年第21卷第2期

页      面：115-121页

核心收录：

学科分类：1002[医学-临床医学] 1001[医学-基础医学(可授医学、理学学位)] 100102[医学-免疫学] 100214[医学-肿瘤学] 10[医学] 

主　　题：Non-overexpression ErbB2 breast cancer Neuregulins Invasion Metastasis 

摘      要：Objective： To explore the effects of neuregulins on ErbB2 receptor signal transduction pathway activation, and invasion and metastasis of non-overexpression ErbB2 breast cancer cell MDA-MB-231. Methods： The expressions of neuregulin were detected by immunocytochemistry and Western blot. MDA-MB-231 cells were treated with ErbB2 kinase inhibitor AG825. Proliferations were measured with MTT assay. Invasion and metastasis of MDA-ME-231 cells were evaluated with transwell chamber. The enzyme activities of MMP-2 and MMP-9 were detected by gelatin zymography. The expressions of MMP-2 and HIF-1α were detected by Western blot. Results： MDA-MB-231 cells expressed a relatively higher level of neuregulin. In Western blot, the positive reaction band was found at 44KD which coincides with the molecular weight of NRG. When MDA-MB-231 cells were treated with AG825, the proliferation was inhibited in a time-dose-dependent manner （P〈0.01）, invasion and metastasis were also depressed （P〈0.05）. The enzyme activities of MMP-2 and MMP-9 were lower （P〈0.05）. The expression levels of MMP-2 and HIF-lct were decreased （P〈0.05）. Conclusion： Our study indicates that neuregulins are synthesized in MDA-MB-231 cells as transmembrane proteins, neuregulins could activate ErbB2 receptor signal transduction pathway by autocrine or paracrine secretion, and induce invasion and metastasis of MDA-MB-231 cells.