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MBC in Press, published online ahead of print March 14, 2007
Mol. Biol. Cell 10.1091/mbc.E06-07-0608

A more recent version of this article appeared on June 1, 2007
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Submitted on July 18, 2006
Revised on February 13, 2007
Accepted on March 6, 2007

PDCD10 Interacts with Ste20-related Kinase MST4 to Promote Cell Growth and Transformation via Modulation of ERK Pathway

Xi Ma,*{dagger} Hongshan Zhao,*{dagger} Jingxuan Shan,{ddagger} Feng Long,{ddagger} Yaoyao Chen,* Yingyu Chen,* Yingmei Zhang,* Xiao Han,* and Dalong Ma*

*Department of Immunology, School of Basic Medicine, and Human Disease Genomics Center, Peking University, Beijing 100083, China; {ddagger}Shanghai Genomics, Inc., Shanghai 201203, China

Monitoring Editor: J. Silvio Gutkind

PDCD10 (programmed cell death 10, TFAR15), a novel protein associated with cell apoptosis has been recently implicated in mutations associated with Cerebral Cavernous Malformations (CCM). Yeast two-hybrid screening revealed that PDCD10 interacts with MST4, a member of Ste20-related kinases. This interaction was confirmed by coimmunoprecipitation and colocalization assays in mammalian cells. Furthermore, the cooverexpression of PDCD10 and MST4 promoted cell proliferation and transformation via modulation of the ERK pathway. Potent short interfering RNAs (siRNA) against PDCD10 (siPDCD10) and MST4 (siMST4) were designed to specifically inhibit the expression of PDCD10 and MST4 mRNA, respectively. The induction of siPDCD10 or siMST4 resulted in decreased expression of endogenous PDCD10 or MST4 which was accompanied by reduced ERK activity and attenuated cell growth and anchorage-independent growth. On the other hand, siMST4 had similar effects in PDCD10-overexpressed cells. And more importantly, we confirmed that either overexpressing or endogenous PDCD10 can increase the MST4 kinase activity in vitro. Our results demonstrated that PDCD10 modulation of ERK signaling was mediated by MST4, and PDCD10 could be a regulatory adaptor necessary for MST4 function, suggesting a link between cerebral cavernous malformation pathogenesis and the ERK-MAPK cascade via PDCD10/MST4.

{dagger}These authors contributed equally to this work.

Address correspondence to: Dalong Ma (madl{at}bjmu.edu.cn)




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