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Contractile effects of Bay k 8644, a dihydropyridine calcium agonist, on isolated femoral arteries from spontaneously hypertensive rats

M Asano, K Aoki and T Matsuda

Agonist actions of methyl-1,4-dihydro-2,6-dimethyl-3-nitro-4-(2- trifluoromethylphenyl)- pyridine-5-carboxylate (Bay k 8644) were investigated in femoral and mesenteric arteries from 6-week-old spontaneously hypertensive rats (SHRs), and data compared with findings in normotensive Wistar-Kyoto rats (WKYs). The addition of Bay k 8644 produced a dose-dependent contraction in SHR femoral artery with a pD2 value of 8.55. Maximum contraction induced by this agonist (1 X 10(-7) M) was comparable to the maximum developed by K+-depolarization. Bay k 8644 was much less effective in eliciting the contractile responses on WKY femoral artery. Contractile responses of mesenteric and tail arteries to Bay k 8644 were weak and were not significantly different between SHR and WKY. Thoracic aorta was sensitive to the contractile response to Bay k 8644, but the sensitivity was not significantly different between SHR and WKY. Increased responsiveness to exogenously applied K+ was also observed in SHR femoral artery as compared to WKY. Contractile responses of SHR femoral artery to Bay k 8644 were antagonized competitively by nifedipine (pA2 = 8.36), a dihydropyridine Ca++ antagonist, but noncompetitively by diltiazem, a non- dihydropyridine Ca++ antagonist. When the effect of nifedipine on the dose-response curve for Bay k 8644 was determined in WKY femoral artery, there was a similar extent of rightward displacement of the dose-response curve to that seen in SHR. Nifedipine was less efficacious in relaxing the contractile response to Bay k 8644 compared to the contractile response to K+ in SHRs femoral arteries.(ABSTRACT TRUNCATED AT 250 WORDS)

Volume 239, Issue 1, pp. 198-205, 10/01/1986
Copyright © 1986 by American Society for Pharmacology and Experimental Therapeutics




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Copyright © 1986 by the American Society for Pharmacology and Experimental Therapeutics.