Opposing Effects of Jun Kinase and p38 Mitogen-Activated Protein Kinases on Cardiomyocyte Hypertrophy
| Autor: | Shino Nemoto, Zelin Sheng, Anning Lin |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
medicine.medical_specialty
Cardiotonic Agents Pyridines p38 mitogen-activated protein kinases Cardiomegaly Protein Serine-Threonine Kinases Leukemia Inhibitory Factor p38 Mitogen-Activated Protein Kinases Phenylephrine Internal medicine Gene expression medicine Animals Enzyme Inhibitors Protein kinase A Cell Growth and Development Molecular Biology Lymphokines Endothelin-1 MAP kinase kinase kinase biology Interleukin-6 Kinase Activator (genetics) Myocardium Imidazoles JNK Mitogen-Activated Protein Kinases Heart Cell Biology JUN kinase Protein-Tyrosine Kinases Growth Inhibitors Rats Endocrinology Mitogen-activated protein kinase Calcium-Calmodulin-Dependent Protein Kinases biology.protein Mitogen-Activated Protein Kinases Atrial Natriuretic Factor |
| Zdroj: | Molecular and Cellular Biology. 18:3518-3526 |
| ISSN: | 1098-5549 |
| Popis: | c-Jun N-terminal protein kinase (JNK) and p38, two distinct members of the mitogen-activated protein (MAP) kinase family, regulate gene expression in response to various extracellular stimuli, yet their physiological functions are not completely understood. In this report we show that JNK and p38 exerted opposing effects on the development of myocyte hypertrophy, which is an adaptive physiological process characterized by expression of embryonic genes and unique morphological changes. In rat neonatal ventricular myocytes, both JNK and p38 were stimulated by hypertrophic agonists like endothelin-1, phenylephrine, and leukemia inhibitory factor. Expression of MAP kinase kinase 6b (EE), a constitutive activator of p38, stimulated the expression of atrial natriuretic factor (ANF), which is a genetic marker of in vivo cardiac hypertrophy. Activation of p38 was required for ANF expression induced by the hypertrophic agonists. Furthermore, a specific p38 inhibitor, SB202190, significantly changed hypertrophic morphology induced by the agonists. Surprisingly, activation of JNK led to inhibition of ANF expression induced by MEK kinase 1 (MEKK1) and the hypertrophic agonists. MEKK1-induced ANF expression was also negatively regulated by expression of c-Jun. Our results demonstrate that p38 mediates, but JNK suppresses, the development of myocyte hypertrophy. |
| Databáze: | OpenAIRE |
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