Abstract:
:We investigated the role of tyrosine phosphorylation of FAK in the stretch-induced MAPKs (extracellular signal-regulated kinase (ERK), p38MAPK) activation in mutant FAK-transfected fibroblasts. In response to uniaxial cyclic stretch (1 Hz, 120% in length), the levels of tyrosine phosphorylation of the Tyr-397 and Tyr-925 of FAK in control cells increased and peaked at 5 min (2.75 +/- 0.51, n = 3), and 20 min (2.98 +/- 0.58, n = 3), respectively, and the activities of MAPKs increased and peaked at approximately 10 min. On the other hand, in the mutant FAK-transfected cells, the stretch-induced MAPKs activation was significantly inhibited. The stretch-induced activation of MAPKs was also significantly abolished by either treatment with Gd(3+) or extracellular Ca(2+) removal which may inhibit intracellular Ca(2+) increase caused by the activation of cation selective (Ca(2+)-permeable) stretch activated (SACatC) channels. These results suggest that the stretch-induced tyrosine-phosphorylation of FAK via SACatC activation is critical for the stretch-induced MAPKs activation.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Wang JG,Miyazu M,Matsushita E,Sokabe M,Naruse Kdoi
10.1006/bbrc.2001.5775subject
Has Abstractpub_date
2001-10-26 00:00:00pages
356-61issue
2eissn
0006-291Xissn
1090-2104pii
S0006-291X(01)95775-4journal_volume
288pub_type
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