Endothelin stimulates hypertrophy and contractility of neonatal rat cardiac myocytes in a serum-free medium.
The effect of endothelin (ET) on rat cardiac myocytes cultured in a serum-free, defined medium was determined. ET simulated cardiac myocyte hypertrophy in a dose-dependent manner as determined by the protein synthesis and cell surface area. Since the myocyte hypertrophy was abolished by H-7, a protein kinase C inhibitor, ET-receptor mediated protein kinase C activation may be involved in cardiac myocyte hypertrophy. At the same time, ET also stimulated myocyte contractility in this medium, and this stimulatory effect was inhibited by nicardipine. This result indicates that the influx of extracellular calcium ion is necessary for the stimulation of contractility induced by ET.
Bio-Science Laboratory, Inc., Yamagata, Japan.
T
T
Suzuki
H
H
Hoshi
Y
Y
Mitsui
D019307:1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine; D000818:Animals; D002118:Calcium / Q000502:physiology; D002478:Cells, Cultured; D016232:Endothelins; D066298:In Vitro Techniques; D007546:Isoquinolines / Q000494:pharmacology; D009119:Muscle Contraction / Q000187:drug effects*; D009124:Muscle Proteins / Q000096:biosynthesis; D009206:Myocardium / Q000166:cytology*; D009529:Nicardipine / Q000494:pharmacology; D010455:Peptides / Q000494:pharmacology*; D010879:Piperazines / Q000494:pharmacology; D011493:Protein Kinase C / Q000502:physiology; D051381:Rats; D011919:Rats, Inbred Strains; D010738:Type C Phospholipases / Q000502:physiology
D016232:Endothelins; D007546:Isoquinolines; D009124:Muscle Proteins; D010455:Peptides; D010879:Piperazines; D019307:1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine; D009529:Nicardipine; D011493:Protein Kinase C; D010738:Type C Phospholipases; D002118:Calcium