v-Crk Induces Rac-dependent Membrane Ruffling and Cell Migration in CAS-deficient Embryonic Fibroblasts

  • Sung, Bong Hwan (Center for Distributed Sensor Network (CDSN), Department of Life Sciences, Gwangju Institute of Science and Technology) ;
  • Yeo, Myoung Gu (Center for Distributed Sensor Network (CDSN), Department of Life Sciences, Gwangju Institute of Science and Technology) ;
  • Oh, Hye Jin (Center for Distributed Sensor Network (CDSN), Department of Life Sciences, Gwangju Institute of Science and Technology) ;
  • Song, Woo Keun (Center for Distributed Sensor Network (CDSN), Department of Life Sciences, Gwangju Institute of Science and Technology)
  • Received : 2007.07.19
  • Accepted : 2007.09.10
  • Published : 2008.02.29

Abstract

Crk-associated substrate (CAS) is a focal adhesion protein that is involved in integrin signaling and cell migration. CAS deficiency reduces the migration and spreading of cells, both of which are processes mediated by Rac activation. We examined the functions of v-Crk, the oncogene product of the CT10 virus p47gag-crk, which affects cell migration and spreading, membrane ruffling, and Rac activation in CAS-deficient mouse embryonic fibroblasts (CAS-/- MEFs). CAS-/- MEFs showed less spreading than did CAS+/+ MEFs, but spreading was recovered in mutant cells that expressed v-Crk (CAS-/-v-Crk MEF). We observed that the reduction in spreading was linked to the formation of membrane ruffles, which were accompanied by Rac activation. In CAS-/- MEFs, Rac activity was significantly reduced, and Rac was not localized to the membrane. In contrast, Rac was active and localized to the membrane in CAS-/-v-Crk MEFs. Lamellipodia protrusion and ruffle retraction velocities were both reduced in CAS-/- MEFs, but not in CAS-/-v-Crk MEFs. We also found that microinjection of anti-gag antibodies inhibited the migration of CAS-/-v-Crk MEFs. These findings indicate that v-Crk controls cell migration and membrane dynamics by activating Rac in CAS-deficient MEFs.

Keywords

CAS;Cell Migration;Membrane Dynamics;Rac;v-Crk

Acknowledgement

Supported by : Ministry of Science and Technology

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