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. 1997 Jan 15;498(Pt 2):453–461. doi: 10.1113/jphysiol.1997.sp021871

Inhibition of nitroxidergic nerve function by neurogenic acetylcholine in monkey cerebral arteries.

N Toda 1, K Ayajiki 1, T Okamura 1
PMCID: PMC1159214  PMID: 9032692

Abstract

1. Modification by endogenous or exogenous acetylcholine and vasoactive intestinal polypeptide (VIP) of vasodilatation mediated by nitric oxide (NO) released from nitroxidergic nerves was studied in isolated monkey cerebral arteries. In arterial strips denuded of endothelium, transmural electrical stimulation (2-20 Hz) produced relaxations that were abolished by tetrodotoxin. 2. The relaxation response was attenuated by acetylcholine, and the attenuation was reversed by atropine. Attenuation was also observed with AF-DX 116, an antagonist of the muscarinic acetylcholine receptor subtype, M2. NO-induced relaxation was not affected by acetylcholine. Neurogenic relaxation was also inhibited by physostigmine and potentiated by atropine. 3. VIP in concentrations that elicited slight relaxation did not alter the response to nerve stimulation. In the strips showing tachyphylaxis to VIP, the neurogenic response was not inhibited. 4. Histochemical studies of whole-mount preparations revealed nerve fibres with NO synthase and VIP immunoreactivity, and also acetylcholinesterase, suggesting the presence of perivascular nitroxidergic, VIPergic and cholinergic innervation. 5. It is concluded that the actions of nitroxidergic nerve fibres on the monkey cerebral artery are inhibited by nerve-released acetylcholine acting on prejunctional muscarinic receptors, possibly of the M2 subtype. Despite the presence of VIP immunoreactive nerve fibres and the ability of exogenous VIP to relax the artery, there is no evidence supporting either a prejunctional modulation of nitroxidergic nerve function by VIP or a role for VIP as a vasodilatory neurotransmitter.

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Selected References

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