期刊
MOLECULAR ONCOLOGY
卷 11, 期 11, 页码 1579-1594出版社
WILEY
DOI: 10.1002/1878-0261.12132
关键词
bladder cancer; invasion; miR-200c; RhoGDI beta
类别
资金
- NIH/NCI [CA165980, CA177665, CA112557]
- NIH/NIEHS [ES000260]
- Natural Science Foundation of China [NSFC81702530, NSFC81773391, NSFC81372946]
- Key Project of Science and Technology Innovation Teamof Zhejiang Province [2013TD10]
Our most recent studies demonstrate that RhoGDI beta is able to promote human bladder cancer (BC) invasion and metastasis in an X-link inhibitor of apoptosis protein-dependent fashion accompanied by increased levels of matrix metalloproteinase (MMP)-2 protein expression. We also found that RhoGDIb and MMP-2 protein expressions are consistently upregulated in both invasive BC tissues and cell lines. In the present study, we show that knockdown of RhoGDIb inhibited MMP-2 protein expression accompanied by a reduction of invasion in human BC cells, whereas ectopic expression of RhoGDIb upregulated MMP-2 protein expression and promoted invasion as well. The mechanistic studies indicated that MMP-2 was upregulated by RhoGDIb at the transcriptional level by increased specific binding of the transcription factor Sp1 to the mmp-2 promoter region. Further investigation revealed that RhoGDIb overexpression led to downregulation of miR-200c, whereas miR-200c was able directly to target 30-UTR of jnk2 mRNA and attenuated JNK2 protein translation, which resulted in attenuation of Sp1 mRNA and protein expression in turn, inhibiting Sp1-dependent mmp-2 transcription. Collectively, our studies demonstrate that RhoGDIb overexpression inhibits miR-200c abundance, which consequently results in increases of JNK2 protein translation, Sp1 expression, mmp-2 transcription, and BC invasion. These findings, together with our previous results showing X-link inhibitor of apoptosis protein mediating mRNA stabilization of both RhoGDIb and mmp-2, reveal the nature of the MMP-2 regulatory network, which leads to MMP-2 overexpression and BC invasion.
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