Protein kinase C and extracellular signal regulated kinase are involved in cardiac hypertrophy of rats with progressive renal injury.

Abstract:

:Increased cardiovascular mortality is an unresolved problem in patients with chronic renal failure. Cardiac hypertrophy is observed in the majority of patients with chronic renal failure undergoing haemodialysis. However, the mechanisms, including signal transduction pathways, responsible for cardiac hypertrophy in renal failure remain unknown. We examined the subcellular localization of protein kinase C (PKC) isoforms and phosphorylation activities of 3 mitogen-activated protein (MAP) kinase families in hypertrophied hearts of progressive renal injury rat model by subtotal nephrectomy (SNx). We also examined the effects of a novel angiotensin II type-1 receptor antagonist, CS-866, on the PKC translocation, MAP kinase activity and cardiac hypertrophy in SNx rats. The left ventricle/body weight ratios were significantly larger in SNx rats than in sham rats at 1, 2, and 4 weeks after surgery. The translocation of PKCalpha and epsilon isoforms to membranous fraction was observed in SNx rat hearts at 1, 2, and 4 weeks after surgery. Activation of extracellular signal regulated kinase (ERK) 1/2, but not p38 MAP kinase and c-Jun N-terminal kinase (JNK), was observed at 1 and 2 weeks after surgery. Angiotensin II receptor blockade with CS-866 (1 mg kg-1 day-1) prevented cardiac hypertrophy, PKC translocation and ERK1/2 activation in SNx rats without significant changes in blood pressure. These data suggest that PKC and ERK1/2 are activated by an angiotensin II receptor-mediated pathway and might play an important role in the progression of cardiac hypertrophy in renal failure.

journal_name

Eur J Clin Invest

authors

Takahashi H,Takeishi Y,Miyamoto T,Shishido T,Arimoto T,Konta T,Miyashita T,Ito M,Kubota I

doi

10.1111/j.1365-2362.2004.01304.x

keywords:

subject

Has Abstract

pub_date

2004-02-01 00:00:00

pages

85-93

issue

2

eissn

0014-2972

issn

1365-2362

pii

1304

journal_volume

34

pub_type

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