Title: RhoGDIβ promotes Sp1/MMP-2 expression and bladder cancer invasion through perturbing miR-200c-targeted JNK2 protein translation.
Authors: Huang, Haishan; Jin, Honglei; Zhao, Huirong; Wang, Jingjing; Li, Xin; Yan, Huiying; Wang, Shuai; Guo, Xirui; Xue, Lei; Li, Jingxia; Peng, Minggang; Wang, Annette; Zhu, Junlan; Wu, Xue-Ru; Chen, Changyan; Huang, Chuanshu
Published In Mol Oncol, (2017 11)
Abstract: Our most recent studies demonstrate that RhoGDIβ 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 RhoGDIβ 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 RhoGDIβ inhibited MMP-2 protein expression accompanied by a reduction of invasion in human BC cells, whereas ectopic expression of RhoGDIβ upregulated MMP-2 protein expression and promoted invasion as well. The mechanistic studies indicated that MMP-2 was upregulated by RhoGDIβ at the transcriptional level by increased specific binding of the transcription factor Sp1 to the mmp-2 promoter region. Further investigation revealed that RhoGDIβ overexpression led to downregulation of miR-200c, whereas miR-200c was able directly to target 3'-UTR of jnk2mRNA and attenuated JNK2 protein translation, which resulted in attenuation of Sp1mRNA and protein expression in turn, inhibiting Sp1-dependent mmp-2 transcription. Collectively, our studies demonstrate that RhoGDIβ 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 RhoGDIβ and mmp-2, reveal the nature of the MMP-2 regulatory network, which leads to MMP-2 overexpression and BC invasion.
PubMed ID: 28846829
MeSH Terms: Cell Line, Tumor; Down-Regulation; Gene Expression Regulation, Neoplastic*; Gene Knockdown Techniques; Humans; Matrix Metalloproteinase 2/genetics*; Matrix Metalloproteinase 2/metabolism; MicroRNAs/genetics*; MicroRNAs/metabolism; Mitogen-Activated Protein Kinase 9/genetics*; Mitogen-Activated Protein Kinase 9/metabolism; Neoplasm Invasiveness/genetics*; Neoplasm Invasiveness/pathology; Protein Biosynthesis; Sp1 Transcription Factor/genetics*; Sp1 Transcription Factor/metabolism; Up-Regulation; Urinary Bladder Neoplasms/genetics*; Urinary Bladder Neoplasms/metabolism; Urinary Bladder Neoplasms/pathology; rho Guanine Nucleotide Dissociation Inhibitor beta/genetics*; rho Guanine Nucleotide Dissociation Inhibitor beta/metabolism