Angiotensin II-induced extracellular signal-regulated kinase 1/2 activation is mediated by protein kinase Cdelta and intracellular calcium in adult rat cardiac fibroblasts.

Title

Angiotensin II-induced extracellular signal-regulated kinase 1/2 activation is mediated by protein kinase Cdelta and intracellular calcium in adult rat cardiac fibroblasts.

Creator

Olson Erik R; Shamhart Patricia E; Naugle Jennifer E; Meszaros J Gary

Publisher

Hypertension (Dallas, Tex. : 1979)

Date

2008
2008-03

Description

Angiotensin II (Ang II)-induced proliferation of cardiac fibroblasts is a major contributing factor to the pathogenesis of cardiac fibrosis. Ang II activates extracellular signal-regulated kinase (ERK) 1/2 to induce cardiac fibroblast proliferation, but the signaling pathways leading to ERK 1/2 activation have not been elucidated in these cells. The goal of the current study was to identify the intracellular mediators of Ang II-induced ERK 1/2 activation in adult rat cardiac fibroblasts. We determined that 100 nmol/L of Ang II-induced ERK 1/2 phosphorylation is inhibited by simultaneous chelation of cytosolic calcium and downregulation of protein kinase C (PKC) by phorbol ester or by the specific PKCdelta inhibitor rottlerin, as well as PKCdelta small interfering RNA, but not by inhibition of 1,2-bis(2-aminophenoxy)ethane-N,N,N',N'-tetraacetate, phorbol ester, rottlerin, or PKCdelta small interfering RNA alone. We also found that Ang II does not transactivate the epidermal growth factor receptor in adult cardiac fibroblasts, because pretreatment with 1 mumol/L of AG 1478 did not significantly inhibit [(3)H]-thymidine incorporation or ERK 1/2 activation. In addition, immunoprecipitation of the epidermal growth factor receptor demonstrated no significant Ang II-induced phosphorylation of tyrosine residues. Inhibition of phosphatidylinositide 3-kinase, PKCzeta, and src tyrosine kinase had no effect on Ang II-induced ERK 1/2 activation. Collectively, these data demonstrate that Ang II does not transactivate the epidermal growth factor receptor in adult rat cardiac fibroblasts to activate ERK 1/2, a common pathway described in vascular smooth muscle and other cell types, but rather occurs via activation of distinct parallel signaling pathways mechanistically controlled by intracellular Ca(2+) and PKCdelta.

Subject

Acetophenones/pharmacology; Angiotensin II/*physiology; Animals; Benzopyrans/pharmacology; Calcium/*metabolism; Cell Proliferation; Cells; Cultured; Enzyme Activation; ErbB Receptors/metabolism; Fibroblasts/*metabolism; Male; Mitogen-Activated Protein Kinase 1/*metabolism; Mitogen-Activated Protein Kinase 3/*metabolism; Myocardium/*cytology/metabolism; Phorbol Esters/pharmacology; Phosphorylation; Protein Kinase C-delta/genetics/*metabolism; Rats; Signal Transduction/physiology; Sprague-Dawley

Rights

Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).

Pages

704–711

Issue

3

Volume

51

Citation

Olson Erik R; Shamhart Patricia E; Naugle Jennifer E; Meszaros J Gary, “Angiotensin II-induced extracellular signal-regulated kinase 1/2 activation is mediated by protein kinase Cdelta and intracellular calcium in adult rat cardiac fibroblasts.,” NEOMED Bibliography Database, accessed June 21, 2021, https://neomed.omeka.net/items/show/4759.

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