Abstract
1. In isolated guinea-pig terminal colon, the effect of sympathetic stimulation on contraction and acetylcholine release elicited by pelvic and transmural stimulation was investigated.
2. Sympathetic stimulation reduced the nerve-mediated contractile responses more than those produced by added acetylcholine.
3. Sympathetic stimulation also reduced the acetylcholine released during pelvic and transmural stimulation at low frequency. The inhibitory effect on acetylcholine released from resting colons is concealed by the simultaneous release of acetylcholine in considerable amounts from stimulated periarterial nerves which probably contain parasympathetic fibres.
4. The inhibitory effect of endogenous and exogenous catecholamines prevails when cholinergic neurones fire at low rates. It was confirmed that adrenaline is more active than noradrenaline.
5. The release of acetylcholine from unstimulated colons was for the most part maintained by nerve-conducted activity, because tetrodotoxin was able to reduce it to about one-tenth.
6. It is suggested that the sympathetic control of gastrointestinal tone and motility is exerted through two different routes: inhibition of intramural cholinergic plexuses and direct relaxation of smooth muscle cells.
7. The possible site and mechanism of action of catecholamines on intramural cholinergic structures is briefly discussed.
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