RTVP-1 expression is regulated by SRF downstream of protein kinase C and contributes to the effect of SRF on glioma cell migration
pmid: 21777672
RTVP-1 expression is regulated by SRF downstream of protein kinase C and contributes to the effect of SRF on glioma cell migration
Gliomas are characterized by increased infiltration into the surrounding normal brain tissue. We recently reported that RTVP-1 is highly expressed in gliomas and plays a role in the migration of these cells, however the regulation of RTVP-1 expression in these cells is not yet described. In this study we examined the role of PKC in the regulation of RTVP-1 expression and found that PMA and overexpression of PKCα and PKCε increased the expression of RTVP-1, whereas PKCδ exerted an opposite effect. Using the MatInspector software, we identified a SRF binding site on the RTVP-1 promoter. Chromatin immunoprecipitation (ChIP) assay revealed that SRF binds to the RTVP-1 promoter in U87 cells, and that this binding was significantly increased in response to serum addition. Moreover, silencing of SRF blocked the induction of RTVP-1 expression in response to serum. We found that overexpression of PKCα and PKCε increased the activity of the RTVP-1 promoter and the binding of SRF to the promoter. In contrast, overexpression of PKCδ blocked the increase in RTVP-1 expression in response to serum and the inhibitory effect of PKCδ was abrogated in cells expressing a SRFT160A mutant. SRF regulated the migration of glioma cells and its effect was partially mediated by RTVP-1. We conclude that RTVP-1 is a PKC-regulated gene and that this regulation is at least partly mediated by SRF. Moreover, RTVP-1 plays a role in the effect of SRF on glioma cell migration.
- Henry Ford Hospital United States
- Henry Ford Health System United States
- Bar-Ilan University Israel
Transcriptional Activation, Serum Response Factor, Base Sequence, Transcription, Genetic, Molecular Sequence Data, Membrane Proteins, Nerve Tissue Proteins, Glioma, Neoplasm Proteins, Isoenzymes, Cell Movement, Cell Line, Tumor, Humans, Phosphorylation, Promoter Regions, Genetic, Protein Kinase C
Transcriptional Activation, Serum Response Factor, Base Sequence, Transcription, Genetic, Molecular Sequence Data, Membrane Proteins, Nerve Tissue Proteins, Glioma, Neoplasm Proteins, Isoenzymes, Cell Movement, Cell Line, Tumor, Humans, Phosphorylation, Promoter Regions, Genetic, Protein Kinase C
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