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. 2008 Feb;7(2):285-92.
doi: 10.4161/cbt.7.2.5302. Epub 2007 Nov 14.

Protein phosphatase 1H, overexpressed in colon adenocarcinoma, is associated with CSE1L

Takeyuki Sugiura  1 , Yoshie Noguchi, Kayo Sakurai, Chiharu Hattori
Affiliations
Free article

Protein phosphatase 1H, overexpressed in colon adenocarcinoma, is associated with CSE1L

Takeyuki Sugiura et al. Cancer Biol Ther. 2008 Feb.
Free article

Abstract

In search for a new anticancer drug target, we explored genes involved in colon adenocarcinoma development through dysregulation of a signal transduction pathway. By using the gene expression profile database, we found protein phosphatase 1H (PPM1H), belonging to the protein phosphatase 2C (PP2C) family, upregulated in colon adenocarcinomas compared with normal colon tissues. RT-PCR analysis verified the elevated level of PPM1H expression in colon cancer cell lines relative to a normal colon cell line. PPM1H encodes a protein with a molecular mass of approximately 50 kDa that resides in the cytoplasm. PPM1H fused with maltose-binding protein expressed in E. coli exhibited phosphatase activity characteristic of the PP2C family. Co-immunoprecipitation coupled with mass spectrometry analysis identified CSE1L, a proliferation and apoptosis-related protein, as a PPM1H-interacting protein. Native, but not inactive, PPM1H expressed in HeLa cells increased the mobility of CSE1L on SDS gels and a similar mobility shift was observed for purified CSE1L after treatment with PPM1H in vitro, supporting the notion that CSE1L is a substrate of PPM1H. Dominant negative PPM1H protected HeLa cells from cell death triggered by staurosporine or taxol. Additionally, knockdown of PPM1H expression with small interfering RNAs suppressed the growth of MCF-7 cells weakly but consistently. PPM1H controls cell cycle and proliferation of cancer cells potentially through dephosphorylation of CSE1L and might be a new target of anticancer drugs.

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Comment in

  • PPM1H--new kid on the block.
    Shreeram S, Bulavin DV. Shreeram S, et al. Cancer Biol Ther. 2008 Feb;7(2):293-4. doi: 10.4161/cbt.7.2.5579. Cancer Biol Ther. 2008. PMID: 18623903 No abstract available.

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