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. 1991 Apr;102(4):855–860. doi: 10.1111/j.1476-5381.1991.tb12266.x

Evidence for facilitatory and inhibitory muscarinic receptors on postganglionic sympathetic nerves in mouse isolated atria.

M Cost 1, H Majewski 1
PMCID: PMC1917992  PMID: 1713109

Abstract

1. McNeil A 343 (10 microM-30 microM) enhanced the fractional stimulation-induced (S-I) outflow of radioactivity from mouse isolated atria which had been incubated with [3H]-noradrenaline. The enhancing effect of McNeil A 343 was not altered by hexamethonium (300 microM) suggesting that it was not due to an action at nicotinic receptors. It is also unlikely that McNeil A 343 enhanced the S-I outflow of radioactivity in mouse atria by blocking neuronal reuptake of noradrenaline since the effect persisted in the presence of cocaine (30 microM). 2. The facilitatory effect of McNeil A 343 on the S-I outflow of radioactivity was attenuated by atropine (0.3 microM), pirenzepine (0.2 microM or 1.0 microM), dicyclomine (1.0 microM) and methoctramine (1.0 microM) and was thus due to activation of muscarinic receptors. 3. In contrast to the effect of McNeil A 343, another muscarinic receptor agonist, carbachol (3.0 microM) significantly decreased the S-I outflow of radioactivity. The receptors through which McNeil A 343 acts to enhance the S-I outflow of radioactivity appear to be distinct from inhibitory prejunctional muscarinic receptors. The relatively M 1-selective antagonist, pirenzepine (0.2 microM), attenuated the facilitatory effect of McNeil A 343 whereas a higher concentration (1.0 microM) was required to block the inhibitory effect of carbachol. Conversely, the relatively M2-selective antagonist, methoctramine (0.1 microM), blocked the inhibitory effect of carbachol but a higher concentration of methoctramine (1.0 microM) was required to block the facilitatory effects of McNeil A 343.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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