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. 1991 Oct;104(2):337–342. doi: 10.1111/j.1476-5381.1991.tb12432.x

Vasodilator response of coronary smooth muscle to the sympathetic co-transmitters noradrenaline and adenosine 5'-triphosphate.

L Corr 1, G Burnstock 1
PMCID: PMC1908566  PMID: 1686735

Abstract

1. Vasodilator and vasoconstrictor responses to noradrenaline (NA), adenosine and adenosine 5'-triphosphate (ATP) were examined in isolated ring segments of the left anterior descending coronary artery of the rabbit in the absence of endothelium. 2. NA caused dose-dependent relaxation of potassium-constricted vessels in the absence of beta-adrenoceptor blockade, with a pD2 of 5.96 +/- 0.21. This was inhibited by 1 microM propranolol. Constrictor responses of vessels at baseline tension were only seen at concentrations greater than 1 mM, and reached a maximum of 6% of the contraction to 30 mM KCl. 3. ATP caused relaxation of the potassium-constricted ring segments in a dose-dependent manner, although a transient constriction often preceded the relaxation. Adenosine was equipotent with ATP in producing relaxation; this was significantly inhibited by the P1-purinoceptor antagonist, 8-phenyltheophylline (8-PT). The responses to ATP were little affected by 8-PT, indicating that ATP was not acting through breakdown to adenosine. At basal tone, ATP produced transient vasoconstriction only at concentrations greater than 0.1 mM, reaching a maximum of 38% of the contraction of 30 mM KCl. 4. We conclude that in the rabbit coronary artery both NA and ATP produce vasodilatation by a direct action on the smooth muscle.

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Selected References

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