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. 1995 Jan;114(2):283–288. doi: 10.1111/j.1476-5381.1995.tb13224.x

Local cardiac effects of substance P: roles of acetylcholine and noradrenaline.

H Chiao 1, R W Caldwell 1
PMCID: PMC1510236  PMID: 7533612

Abstract

1. The local cardiac actions of substance P were examined in isolated perfused hearts and atria of the guinea-pig. 2. In both hearts and right atria, substance P caused negative inotropic and chronotropic effects. 3. Atropine (10(-6) M) or depletion of acetylcholine, by electrical stimulation and hemicholinium-3 perfusion, significantly attenuated the negative inotropic and chronotropic effects of substance P. alpha- and beta-adrenoceptor blockade by nadolol and phentolamine (10(-6) M each) did not prevent the negative inotropic and chronotropic effects of substance P. This indicates that cholinergic neurones, but not adrenergic neurones, partially mediate the effects of substance P. 4. There was no significant difference in the effects of substance P observed between groups with acetylcholine depletion and with cholinoceptor blockade. This suggests that substance P elicits its effects mainly through release of acetylcholine. 5. These results indicate that substance P has negative inotropic and chronotropic effects in guinea-pig hearts and right atria mediated partly by release of acetylcholine. Substance P also appears to have direct effects on cardiac tissue.

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Selected References

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