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Functional role of calcium-activated potassium (KCA) channels on the basal and agonist-elevated arterial tones was investigated in isolated rabbit aorta, porcine and canine coronary arteries as well as in human internal mammary artery. The vascular tones enhanced by contractile agents were increased further by preincubation of these conduit blood vessels with selective (charybdotoxin or iberiotoxin) or non-selective (tetraethylammonium) inhibitors of KCA channels. The basal tone (without an agonist) was increased only in the canine coronary artery. The results indicate a feed-back regulatory role of KCA channels counteracting the vasospasm of conduit arteries.

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Bult H, De Meyer GR, Herman AG: Influence of chronic treatment with a nitric oxide donor on fatty streak development and reactivity of the rabbit aorta. Br. J. Pharmacol. 114, 1371–1382 (1995). Herman A

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, Jayakody RL, Senaratne MP, Thomson AB, Kappagoda CT: Endothelium-dependent relaxation and experimental atherosclerosis in the rabbit aorta. Can. J. Physiol. Pharmacol. 64, 1451–1453 (1986) Kappagoda C

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organ culture model of rabbit aorta: evidence for a pressure-induced tissue renin-angiotensin system. Circ. Res. 79, 70–78 (1996) Tedgui A. Pressure and angiotensin II synergistically

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aorta caused by endothelium-derived PGH2-TxA2. Am. J. Physiol., 1989, 257 , H1327–H1333. Cohen R. A. Contraction of diabetic rabbit aorta caused by endothelium-derived PGH2-TxA2

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158 164 Pagano PJ, Lin L, Sessa WC, Nasjletti A: Arachidonic acid elicits endothelium-dependent release from the rabbit aorta of a constrictor prostanoid resembling

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M , Doğan N : Role of the endothelium on the response to adrenoceptor agonists of rabbit aorta during cooling . Fundam. Clin. Pharmacol. 14, 25

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, Powers HJ , Lewis MJ : Homocysteine-induced inhibition of endothelium-dependent relaxation in rabbit aorta: role for superoxide anions

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