Growth factors stimulate kidney proximal tubule cell migration independent of augmented tyrosine phosphorylation of focal adhesion kinase

  • Cao Y
  • Baig M
  • Hamm L
 et al. 
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Migration of human proximal tubule cells (HKC-5) was stimulated by epidermal growth factor (EGF), hepatocyte growth factor (HGF), and insulin-like growth factor-1 (IGF-1). Integrin signaling via phosphorylation of focal adhesion kinase (FAK) appears to play a central role in cell migration. Once stimulated, FAK undergoes autophosphorylation at tyrosine (Y) 397, followed by phosphorylation of several sites including Y576/Y577 which increases FAK's kinase activity, as well as at Y407, Y861, and Y925. EGF, HGF, and IGF-1 stimulate FAK phosphorylation in various cells. We showed that endothelin stimulated phosphorylation of Y397 in fibroblasts but not HKC-5 cells. After EGF stimulation, HKC-5 cells showed no change in tyrosine phosphorylation at FAK Y397, 407, 576, 861, or 925. Similarly, HGF and IGF-1 did not stimulate the phosphorylation of FAK Y397 in HKC-5 cells. Further, after inhibition of FAK expression by siRNA, cell migration was similar to cells treated with non-target siRNA and responded to EGF with increased migration. Thus, in proximal tubule cells, stimulation of cell migration by growth factors was independent of augmented FAK tyrosine phosphorylation. © 2005 Elsevier Inc. All rights reserved.

Author-supplied keywords

  • Cell migration
  • Epidermal growth factor
  • Focal adhesion kinase
  • Hepatocyte growth factor
  • Insulin-like growth factor-1
  • Kidney proximal tubule cells
  • Phosphotyrosine

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  • Yangming Cao

  • Masood R. Baig

  • L. Lee Hamm

  • Kuoting Wu

  • Eric E. Simon

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