Abstract
1 Prostaglandins F1α and F2α caused contraction of the longitudinal muscle of both guinea-pig isolated ileum and colon, apparently by acting directly on the muscle and on cholinergic nerves. They had little effect on ileal circular muscle.
2 Prostaglandins E1 and E2 caused contraction of the longitudinal muscle of guinea-pig isolated colon, apparently by acting directly on the muscle and on excitatory nerves which are non-cholinergic. Prostaglandin E1 seems more effective than E2 in stimulating these nerves.
3 It seems likely that prostaglandin release in vitro maintains the tone of the longitudinal muscle of guinea-pig colon, whereas release of a prostaglandin E compound inhibits circular muscle tone.
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Selected References
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