Abstract:
:Bradykinin (BK) B2 receptor signaling involves activation of phospholipase C (PLC). PLC activation by other receptors consists of either allosteric activation of PLC beta isoforms by G-proteins or tyrosine phosphorylation of PLC gamma isoforms. Because the B2 receptor is a G-protein-coupled receptor, it has been assumed that the receptor signals through PLC beta. In the present study, however, we have found that BK stimulation of IP3 production and the Ca2+ signal in endothelial cells is dependent on tyrosine phosphorylation. Furthermore, stimulation of B2 receptors in these cells is accompanied by a transient tyrosine phosphorylation of PLC gamma 1. Phosphorylation is correlated with increased IP3 production and association of PLC gamma 1 with the C-terminal intracellular domain of the B2 receptor. The B2 receptor can thus physically associate with intracellular proteins other than G-proteins. Activation of PLC gamma isoforms, rather than PLC beta isoforms, may, therefore, be primarily responsible for BK-stimulated IP3 generation in endothelial cells.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Venema VJ,Ju H,Sun J,Eaton DC,Marrero MB,Venema RCdoi
10.1006/bbrc.1998.8574subject
Has Abstractpub_date
1998-05-08 00:00:00pages
70-5issue
1eissn
0006-291Xissn
1090-2104pii
S0006-291X(98)98574-6journal_volume
246pub_type
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