Coupling of RAFTK/Pyk2 kinase with c-Abl and their role in the migration of breast cancer cells

  • Authors: Sheila Zrihan-Licht, Shalom Avraham, Shuxian Jiang, Yigong Fu, Hava Karsenty Avraham
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  • Published online on: Thursday, January 1, 2004
  • Pages: 153-159
  • DOI: 10.3892/ijo.24.1.153

Abstract

Mitogen-induced changes in the actin cytoskeleton are accompanied by changes in the tyrosine phosphorylation of several proteins in focal adhesions. In this study, we have investigated the role of RAFTK (also termed Pyk2/CAK-β), a cytoplasmic tyrosine kinase related to focal adhesion kinase (FAK), in heregulin-mediated signal transduction in breast cancer cells. Stimulation of T47D cells with heregulin (HRG) induced the tyrosine phosphorylation of RAFTK and the formation of a multiprotein complex. Maximal phosphorylation of the proteins participating in this complex occurred within 2 h of HRG stimulation. Analyses of the members of the HRG-stimulated complex revealed that RAFTK associated with p190 RhoGAP (p190), RasGAP, c-Abl as well as with the focal adhesion molecules p130cas and paxillin. c-Abl was found to be associated with RAFTK through the region of RAFTK containing amino acids 419-1009. Site-directed mutagenesis of Y881 aa within the RAFTK sequence abolished the binding of RAFTK to c-Abl, indicating that the tyrosine residue 881 of RAFTK is the c-Abl binding site within the RAFTK molecule. Overexpression of wild-type RAFTK significantly enhanced breast cancer cell invasion, while overexpression of the mutants Tyr402 or Tyr881 of RAFTK inhibited this migration. Therefore, RAFTK serves as a mediator and an integration point between focal adhesion molecules in HRG-mediated signaling in T47D breast cancer cells.
Journal Cover

January 2004
Volume 24 Issue 1

Print ISSN: 1019-6439
Online ISSN:1791-2423

2012 Impact Factor: 2.773
Ranked #30/202 Oncology
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APA
Zrihan-Licht, S., Avraham, S., Jiang, S., Fu, Y., & Avraham, H. (2004). Coupling of RAFTK/Pyk2 kinase with c-Abl and their role in the migration of breast cancer cells. International Journal of Oncology, 24(1), 153-159.
MLA
Zrihan-Licht, Avraham, Jiang, Fu, and Hava Avraham. "Coupling of RAFTK/Pyk2 kinase with c-Abl and their role in the migration of breast cancer cells." International Journal of Oncology International Journal of Oncology 24.1 (2004): 153-159.
Chicago
Zrihan-Licht, Avraham, Jiang, Fu, and Hava Avraham. "Coupling of RAFTK/Pyk2 kinase with c-Abl and their role in the migration of breast cancer cells." International Journal of Oncology International Journal of Oncology 24 no. 1 (2004): 153-159.