7-Ketocholesterol and cholesterol-5α,6α-epoxide induce smooth muscle cell migration and proliferation through the epidermal growth factor receptor/phosphoinositide 3-kinase/Akt signaling pathways

Po Lin Liao, Yu Wen Cheng, Ching Hao Li, Yan Ting Wang, Jaw Jou Kang

研究成果: 雜誌貢獻文章

16 引文 斯高帕斯(Scopus)

摘要

Oxysterols, the major components of oxidized low-density lipoproteins (ox-LDLs), are present in atherosclerotic plaque and are suggested to play an active role in plaque development. The formation of an atherosclerotic lesion occurs through activation of cellular events that include vascular smooth muscle cell (SMC) migration and proliferation. Therefore, we investigated the roles of two common oxysterols, 7-ketocholesterol (7-keto) and cholesterol-5α,6α-epoxide (α-epoxide) on SMCs. Our results showed that 7-keto and α-epoxide promoted SMC migration by a chemotactic assay, and induced mitogenic effects by MTT assay and BrdU assay. Specific inhibitors confirmed that MMPs, EGFR and PI3K are involved in oxysterol-induced SMC migration, while EGFR, ERK, Akt, and sphingomyelin/ceramide pathways might play a role in SMC proliferation. More, the co-immunoprecipitation study indicated that 7-keto and α-epoxide caused EGFR phosphorylation and there was an interaction between EGFR and PI3K. At protein expression level, Akt and ERK were activated, at messenger RNA level, MMP-2/9 mRNA was transcribed, at enzyme activity level, the MMP-2/9 enzyme activity were increased in SMCs treated with 7-keto and α-epoxide according to Western bolt, RT-PCR and a fluorogenic substrate. Taken together, we concluded that 7-keto and α-epoxide may be an atherogenic factor by stimulating SMC migration and proliferation.
原文英語
頁(從 - 到)88-96
頁數9
期刊Toxicology Letters
197
發行號2
DOIs
出版狀態已發佈 - 八月 2010

ASJC Scopus subject areas

  • Toxicology

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