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Published 28 May 2002. doi:10.1083/jcb.200203126
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© The Rockefeller University Press, 0021-9525/2002/5/831 $5.00
The Journal of Cell Biology, Volume 157, Number 5, May 28, 2002 831-838


Article

LIM kinase and Diaphanous cooperate to regulate serum response factor and actin dynamics



Olivier Geneste, John W. Copeland and Richard Treisman

Cancer Research UK London Research Institute, Lincoln's Inn Fields Laboratories, London WC2A 3PX, UK

Address correspondence to Richard Treisman, Cancer Research UK London Research Institute, Lincoln's Inn Fields Laboratories, Transcription Laboratory, Room 401, 44 Lincoln's Inn Fields, London WC2A 3PX, UK. Tel.: 44-207-269-3271. Fax: 44-207-269-3093. E-mail: richard.treisman{at}cancer.org.uk

The small GTPase RhoA controls activity of serum response factor (SRF) by inducing changes in actin dynamics. We show that in PC12 cells, activation of SRF after serum stimulation is RhoA dependent, requiring both actin polymerization and the Rho kinase (ROCK)–LIM kinase (LIMK)–cofilin signaling pathway, previously shown to control F-actin turnover. Activation of SRF by overexpression of wild-type LIMK or ROCK-insensitive LIMK mutants also requires functional RhoA, indicating that a second RhoA-dependent signal is involved. This is provided by the RhoA effector mDia: dominant interfering mDia1 derivatives inhibit both serum- and LIMK-induced SRF activation and reduce the ability of LIMK to induce F-actin accumulation. These results demonstrate a role for LIMK in SRF activation, and functional cooperation between RhoA-controlled LIMK and mDia effector pathways.

Key Words: LIM kinase; mDia; ROCK; actin; SRF


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