乳腺癌MDA-MB-231细胞源Exosomes对内皮细胞增殖的影响及MAPK/ERK和PI3K/Akt信号通路的作用  

Effects of exosomes derived from MDA-MB-231 on proliferation of endothelial cells and the role of MAPK/ERK and PI3K/Akt pathways

作　　者：隆霜[1] 沈宜[1] 谢莹珊[1] 范维珂[1] 姜蓉[1] 陈黎[1] 

机构地区：[1]重庆医科大学基础医学院病理生理教研室,干细胞与组织工程研究室,400016

出　　处：《解放军医学杂志》2012年第11期1054-1058,共5页Medical Journal of Chinese People's Liberation Army

摘　　要：目的研究人乳腺癌MDA-MB-231细胞源Exosomes对人脐静脉内皮细胞(HUVECs)的促增殖作用,并初步探讨MAPK/ERK和PI3K/Akt信号转导通路在此过程中的作用。方法低温超速离心及密度梯度离心法提取乳腺癌MDA-MB-231细胞源Exosomes。采用MTT法分别检测50、100、200、400μg/ml Exosomes对HUVECs促增殖作用的影响,流式细胞仪测定200μg/ml Exosomes对HUVECs细胞周期的影响,Western blotting检测200μg/ml Exosomes诱导下HUVECs细胞内细胞外调节蛋白激酶(ERK)和蛋白激酶B(Akt)蛋白的表达水平。结果乳腺癌MDA-MB-231细胞源Exosomes可促进HUVECs细胞增殖,且呈时间和剂量依赖性。200μg/ml Exosomes作用HUVECs细胞24h后,S期细胞比例(27.8%±3.37%)较对照组(15.34%±0.71%)增加(P<0.05),G1/S期细胞比例(2.22%±0.37%)与对照组(4.67%±0.47%)比较下降(P<0.05)。Western blotting结果显示,200μg/ml Exosomes作用HUVECs细胞24、48、72h后,磷酸化ERK表达(0.3378±0.0415,0.4967±0.0511,0.9205±0.0462)与磷酸化Akt蛋白表达(0.4091±0.0361,0.5484±0.0382,0.7496±0.0481)与对照组(磷酸化ERK 0.1836±0.0324,磷酸化Akt 0.2582±0.0215)相比有所增加(P<0.05)。结论乳腺癌MDA-MB-231细胞源Exosomes能促进HUVECs的增殖,其机制可能与细胞周期改变,以及MAPK/ERK和PI3K/Akt信号通路的持续活化有关。Objective To investigate the effects of exosomes derived from breast cancer cell line MDA-MB-231 on proliferation of human umbilical cord vein endothelial cells （HUVECs）, and evaluate the role of MAPK/ERK and PI3K/Akt signal transduction pathway during the process. Methods Exosomes were derived and purified from MDA-MB-231 by cryogenic ultracentrifugation and density gradient centrifugation. MTT assay was carried out for measurement of cell proliferation in HUVECs with exosome of 50, 100, 200 and 400μg/ml. The states of cell cycle of HUVECs co-cultured with 200μg/ml exosomes were detected by flow cytometry. The effects of 200μg/ml exosomes on the expression of ERK, Akt and phosphorylated ERK, Akt in HUVECs were detected with Western blotting. Results Exosomes derived from MDA-MB-231 significantly promoted HUVECs proliferation in a classical time- and dose-dependent manner. Flow cytometry revealed that, co-cultured with 200μg/ml exosomes for 24h, S-phase cells in HUVECs increased, while G1/S phase cells in HUVECs decreased. Western blotting showed that, co- cultured with 200μg/ml exosomes for 24h, 48h and 72h, the expressions of phosphorylated ERK and Akt were up-regulated in a time-dependent manner. Conclusion Exosomes derived from breast cancer cell line MDA-MB-231 may promote HUVECs proliferation, the changes in cell cycle and the continuous activation of the MAPK/ERK and PI3K/Akt signal transduction pathways may be the underlying mechanism.

关 键 词：EXOSOMES 胞外信号调节激酶 蛋白激酶B 增殖 乳腺癌 

分 类 号：R730.23[医药卫生—肿瘤]