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MBC in Press, published online ahead of print August 16, 2006
Mol. Biol. Cell 10.1091/mbc.E06-05-0466

A more recent version of this article appeared on November 1, 2006
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Submitted on May 31, 2006
Revised on August 3, 2006
Accepted on August 8, 2006

Gene Targeting of Cdc42 and Cdc42GAP Affirms the Critical Involvement of Cdc42 in Filopodia Induction, Directed Migration, and Proliferation in Primary Mouse Embryonic Fibroblasts

Linda Yang, Lei Wang, and Yi Zheng

Division of Experimental Hematology, Children’s Hospital Medical Center, Molecular Developmental Biology Graduate Program, University of Cincinnati, Cincinnati, OH 45229

Monitoring Editor: Mark Ginsberg

Recent studies in Cdc42 knockout mouse embryonic stem (ES) cells and ES-derived fibroblastoid cell lines raise concern on a body of literature derived by dominant mutant expression approach in a variety of cell lines implicating mammalian Cdc42 as a key regulator of filopodia induction, directional migration and cell cycle progression. To resolve the physiological function of mammalian Cdc42, we have characterized the Cdc42-/- and Cdc42GAP-/- primary mouse embryonic fibroblasts (MEFs) produced by gene targeting as the Cdc42 loss or gain of activity cell model. The Cdc42-/- cells were defective in filopodia formation stimulated by bradykinin and in dorsal membrane ruffling stimulated by PDGF, whereas the Cdc42GAP-/- cells displayed spontaneous filopodia. The Cdc42 loss or gain of activity cells were defective in adhesion to fibronectin, wound-healing, polarity establishment and migration toward a serum gradient. These defects were associated with deficiencies of PAK1, GSK3{beta}, myosin light chain, and FAK phosphorylation. Furthermore, Cdc42-/- cells were defective in G1/S-phase transition and survival, correlating with deficient NF-{kappa}B transcription and defective JNK, p70 S6K, and ERK1/2 activation. These results demonstrate a different requirement of Cdc42 activity in primary MEFs from ES or ES-derived clonal fibroblastoid cells and suggest that Cdc42 plays cell type-specific signaling roles.

Address correspondence to: Yi Zheng (yi.zheng{at}chmcc.org)




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