The effect of PGE1 on peristalsis and on perivascular nerve inhibition of peristaltic activity in guinea-pig isolated ileum

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Abstract
The effect of PGE1 on peristalsis of guinea-pig isolated ileum was examined using a modified Trendelenburg method to evoke and record peristaltic activity. PGE1 (14 nm, 0·11 μm and 0·56 μm) increased peristaltic activity of both longitudinal and circular muscle, mainly by increasing the amplitude of contraction. Preparations of ileum subjected to a ‘minimal’ peristaltic stimulus were more sensitive to the effects of PGE, than were preparations subjected to a ‘just-maximal’ peristaltic stimulus. The inhibition of peristaltic activity caused by perivascular nerve stimulation was antagonized by 0·56 μm PGE1 but slightly increased by 14 nm PGE1.