p38 Mitogen-activated Protein Kinase Pathway Protects Adult Rat Ventricular Myocytes against β-Adrenergic Receptor-stimulated Apoptosis

We have shown that stimulation of β-adrenergic receptors (β-AR) by norepinephrine (NE) increases apoptosis in adult rat ventricular myocytes (ARVMs) via a cAMP-dependent mechanism that is antagonized by activation of Giprotein. The family of mitogen-activated protein kinases (MAPKs) is involved in the regulation of cardiac myocyte growth and apoptosis. Here we show that β-AR stimulation activates p38 kinase, c-jun N-terminal kinases (JNKs), and extracellular signal-regulated kinase (ERK1/2) in ARVMs. Inhibition of p38 kinase with SB-202190 (10 μm) potentiated β-AR-stimulated apoptosis as measured by flow cytometry and terminal deoxynucleotidyl transferase-mediated nick end labeling (TUNEL) staining. SB-202190 at this concentration specifically blocked β-AR-stimulated activation of p38 kinase and its downstream substrate MAPK-activated protein kinase-2 (MAPKAPK2). Pertussis toxin, an inhibitor of Gi/Go proteins, blocked the activation of p38 kinase and potentiated β-AR-stimulated apoptosis. Activation of Gi protein with the muscarinic receptor agonist carbachol protected against β-AR-stimulated apoptosis. Carbachol also activated p38 kinase, and the protective effect of carbachol was abolished by SB-202190. PD-98059 (10 μm), an inhibitor of ERK1/2 pathway, blocked β-AR-stimulated activation of ERK1/2 but had no effect on apoptosis. These data suggest that 1) β-AR stimulation activates p38 kinase, JNKs, and ERK1/2; 2) activation of p38 kinase plays a protective role in β-AR-stimulated apoptosis in cardiac myocytes; and 3) the protective effects of Gi are mediated via the activation of p38 kinase.

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