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Endothelins increase tyrosine phosphorylation of astrocytic focal adhesion kinase and paxillin accompanied by their association with cytoskeletal components.

Abstract：

:Astrocytic endothelin receptors are involved in the appearance of activated astrocytes upon injury of the brain [Ishikawa N. et al. (1997) Eur. J. Neurosci. 9, 895-901; Koyama Y. et al. (1999) Glia 26, 268-271]. To clarify signal transduction triggered by endothelin receptors, we examined the effects of endothelins on protein tyrosine phosphorylation in cultured rat astrocytes. Endothelin-1 (1 nM) increased tyrosine phosphorylation of focal adhesion kinase and paxillin. The tyrosine phosphorylation was also induced by endothelin-1 (1 nM) and Ala(1,3,11,15)-endothelin-1 (10nM), an endothelin-B receptor agonist. BQ788 (100 nM), an endothelin-B receptor antagonist, inhibited the effects of endothelin-3. Orthovanadate (VO(4)(3-)), a tyrosine phosphatase inhibitor, but not bradykinin (1 microM), angiotensin II (100 nM), A23187 (5 microM) and phorbol 12-myristate 13-acetate (100 nM), increased tyrosine phosphorylation of focal adhesion kinase and paxillin. The tyrosine phosphorylation by endothelin-3 was not prevented by pertussis toxin, Ca(2+) chelation, protein kinase C inhibitors (calphostin C and staurosporine) or wortmannin. Immunocytochemical staining showed that endothelin-3 and VO(4)(3-) induced redistribution of focal adhesion kinase and paxillin to focal adhesions concomitant with stress fiber formation in dibutyryl cyclic-AMP-treated astrocytes. Treatment with endothelin-3 and VO(4)(3-) increased focal adhesion kinase and paxillin associated with astrocytic cytoskeletal fraction. In the presence of cytochalasin B, an actin disrupting agent, endothelin-3 and VO(4)(3-) did not phosphorylate focal adhesion kinase and paxillin. Application of cytochalasin B after treatment with endothelin-3 and VO(4)(3-) stimulated dephosphorylation of focal adhesion kinase and paxillin. These results suggest that the associations of focal adhesion kinase and paxillin with cytoskeletal components are required in the endothelin-induced tyrosine phosphorylation of the astrocytic proteins.

journal_name

Neuroscience

journal_title

Neuroscience

authors

Koyama Y,Yoshioka Y,Hashimoto H,Matsuda T,Baba A

doi

10.1016/s0306-4522(00)00330-4

keywords:

subject

Has Abstract

pub_date

2000-01-01 00:00:00

pages

219-27

issue

1

eissn

0306-4522

issn

1873-7544

pii

S0306-4522(00)00330-4

journal_volume

101

pub_type

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