Inhibitory effects of insulin on cytosolic Ca2+ level and contraction in the rat aorta. Endothelium-dependent and -independent mechanisms.
To determine the mechanism of the inhibitory effect of insulin on vascular tone, contraction was measured simultaneously with endothelial and smooth muscle cytosolic Ca2+ level ([Ca2+]i) in the isolated rat aorta. Insulin (200 mU/mL) increased endothelial [Ca2+]i and decreased resting muscle tone. The removal of endothelium abolished the effects of insulin. In the aorta precontracted with norepinephrine, insulin (3 to 120 mU/mL) induced concentration-dependent inhibition of contraction. The relaxant effect followed the increase in endothelial [Ca2+]i and decrease in smooth muscle [Ca2+]i. The relaxant effect was attenuated by removal of endothelium or by the addition of 10(-5) mol/L NG-monomethyl-L-arginine but not by 10(-5) mol/L indomethacin. In the absence of endothelium, the relaxant effect of insulin followed the decrease in smooth muscle [Ca2+]i. These results suggest that insulin inhibits vascular contraction by dual mechanisms in the isolated rat aorta: (1) Insulin acts on vascular endothelium by increasing endothelial [Ca2+]i and releasing NO, which decreases smooth muscle [Ca2+]i and the Ca2+ sensitivity of the contractile elements. (2) Insulin also directly acts on smooth muscle and decreases smooth muscle [Ca2+]i.
Han
S Z
SZ
Department of Geriatrics, Faculty of Medicine, University of Tokyo, Japan.
Ouchi
Y
Y
Karaki
H
H
Orimo
H
H
D000818:Animals; D001011:Aorta / Q000502:physiology*; D002118:Calcium / Q000378:metabolism*; D004594:Electrophysiology; D004730:Endothelium, Vascular / Q000502:physiology; D006728:Hormones / Q000494:pharmacology*; D007328:Insulin / Q000494:pharmacology*; D008297:Male; D009119:Muscle Contraction / Q000187:drug effects; D009131:Muscle, Smooth, Vascular / Q000502:physiology; D051381:Rats; D017208:Rats, Wistar
D006728:Hormones; D007328:Insulin; D002118:Calcium