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标题：Inhibition of Reactive Oxygen Species/Extracellular Signal-Regulated Kinases Pathway by Pioglitazone Attenuates Advanced Glycation End Products-Induced Proliferation of Vascular Smooth Muscle Cells in Rats
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作者：Xiaochen Yuan ; Zhengang Zhang ; Kaizheng Gong 等
期刊名称：Biological and Pharmaceutical Bulletin
印刷版ISSN：0918-6158
电子版ISSN：1347-5215
出版年度：2011
卷号：34
期号：5
页码：618-623
DOI：10.1248/bpb.34.618
出版社：The Pharmaceutical Society of Japan
摘要：Advanced glycation end products (AGEs) have been shown to induce the proliferation of vascular smooth muscle cells (VSMCs) and contribute to atherogenesis and diabetes. In the present study, we investigated the effects of pioglitazone, a peroxisome proliferator activated receptor gamma (PPARγ) agonist, on AGE-induced rat VSMC growth and the underlying mechanism. In cultured rat VSMCs, AGE treatment induced VSMC proliferation in time- and dose-dependent manner, while down-regulated the expression of PPARγ. Pretreatment of pioglitazone not only prevented the down-regulation of PPARγ, but inhibited VSMC proliferation and prevented S -phase entry of cell via a G0–G1 block in the presence of AGEs. Western blotting analysis showed that AGE treatment potentiated to activate extracelluar signal-regulated kinases (ERK1/2) by the induction of intracellular reactive oxygen species (ROS) production, since ROS scavenger N -acetyl- L -cysteine pretreatment significantly inhibited AGE-induced ERK1/2 activation. Further, pretreatment with either N -acetyl- L -cysteine or the inhibitor of ERK1/2 activation suppressed AGE-induced proliferation of VSMCs, suggesting a role of ROS/ERK1/2 signaling. Notably, we demonstrated that pretreatment of pioglitazone significantly attenuated AGE-induced ROS and ERK1/2 activation. Collectively, these results suggest that pioglitazone inhibits AGE-induced VSMC proliferation via increasing PPARγ expression and inhibiting ROS/ERK1/2 signaling pathway.
关键词：pioglitazone;advanced glycation end product;vascular smooth muscle cell;peroxisome proliferator activated receptor gamma;proliferation