Salivary phospholipid secretion in response to beta-adrenergic stimulation is mediated by Src kinase-dependent epidermal growth factor receptor transactivation.

Abstract:

:Communication between receptor tyrosine kinase and G protein-coupled receptor (GPCR)-mediated signaling is recognized as a common integrator linking diverse aspects of intracellular signaling systems. Here, we report that G protein-coupled beta-adrenergic receptor activation leading to stimulation of salivary phospholipid release occurs with the involvement of epidermal growth factor receptor (EGFR). Using sublingual gland acinar cells, we show that prosecretory effect of isoproterenol on phospholipid release was subjected to suppression by EGFR kinase inhibitor, PD153035, and wortmannin, an inhibitor of PI3K, but not by PD98059, an inhibitor of extracellular signal regulated kinase (ERK). Furthermore, wortmannin, but not the ERK inhibitor, caused the reduction in the acinar cell secretory responses to beta-adrenergic agonist-generated cAMP as well as adenyl cyclase activator, forskolin. The acinar cell phospholipid secretory responses to isoproterenol, moreover, were inhibited by PP2, a selective inhibitor of tyrosine kinase Src responsible for ligand-independent EGFR phosphorylation. Taken together, our data are the first to demonstrate the requirement for Src kinase-dependent EGFR transactivation in regulation of salivary phospholipid secretion in response to beta-adrenergic GPCR activation.

authors

Slomiany BL,Slomiany A

doi

10.1016/j.bbrc.2004.04.016

subject

Has Abstract

pub_date

2004-05-21 00:00:00

pages

247-52

issue

1

eissn

0006-291X

issn

1090-2104

pii

S0006291X04007223

journal_volume

318

pub_type

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