Regulation of calcium-sensitive tyrosine kinase Pyk2 by angiotensin II in endothelial cells. Roles of Yes tyrosine kinase and tyrosine phosphatase SHP-2

• Published in: The Journal of biological chemistry Vol. 275; no. 12; pp. 8389 - 8396
• Main Authors: Tang, H, Zhao, Z J, Landon, E J, Inagami, T
• Format: Journal Article
• Language: English
• Published: United States 24.03.2000
• Subjects: Angiotensin II - metabolism; Animals; Endothelium, Vascular - cytology; Endothelium, Vascular - physiology; Focal Adhesion Kinase 2; Intracellular Signaling Peptides and Proteins; JNK Mitogen-Activated Protein Kinases; Mitogen-Activated Protein Kinases - metabolism; Phosphorylation; Protein Binding; Protein Tyrosine Phosphatase, Non-Receptor Type 1; Protein Tyrosine Phosphatase, Non-Receptor Type 11; Protein Tyrosine Phosphatase, Non-Receptor Type 6; Protein Tyrosine Phosphatases - metabolism; Protein-Tyrosine Kinases - metabolism; Proto-Oncogene Proteins - metabolism; Proto-Oncogene Proteins c-fyn; Proto-Oncogene Proteins c-yes; Pulmonary Veins - cytology; Pyk2 protein; Rats; Receptor, Angiotensin, Type 1; Receptor, Angiotensin, Type 2; Receptors, Angiotensin - metabolism; SH2 Domain-Containing Protein Tyrosine Phosphatases; Signal Transduction; src-Family Kinases - metabolism; Tyrosine - metabolism; Yes protein
• ISSN: 0021-9258
• DOI: 10.1074/jbc.275.12.8389

Calcium-sensitive tyrosine kinase Pyk2 has been implicated in the regulation of ion channels, cellular adhesion, and mitogenic and hypertrophic reactions. In this study, we have investigated the regulation of Pyk2 by angiotensin II (Ang II) in pulmonary vein endothelial cells. We found that the Ang II-induced tyrosine phosphorylation of Pyk2, which requires the activity of Src family kinase, was specifically regulated by the Src family kinase member, Yes kinase. Moreover, we identified for the first time the constitutive association of Pyk2 with an Src homology 2 (SH2) domain-containing tyrosine phosphatase SHP-2. SHP-2 interacts with Pyk2 through a region other than its SH2 domains. Pyk2 can be dephosphorylated in vitro in SHP-2 immunoprecipitates and in intact cells expressing an NH(2) terminus-truncated form of SHP-2, which lacks the two SH2 domains but has an enhanced phosphatase activity. Ang II activates the endogenous SHP-2. Finally, the SHP-2-mediated dephosphorylation of Pyk2 correlates with the negative effect of SHP-2 on the Ang II-induced activation of extracellular signal-regulated kinase and c-Jun NH(2)-terminal kinase. Thus, the balance of Pyk2 tyrosine phosphorylation in response to Ang II is controlled by Yes kinase and by a tyrosine phosphatase SHP-2 in endothelial cells.