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Fig. 9. Tension recordings from the intestinal vein showing the vasodilatory effect
of the calcium ionophore, A23187 (A), and its effect in the presence of the
cyclo-oxygenase inhibitor, indomethacin (B), and in the absence of an intact
endothelium (C). Vessels were pre-incubated with indomethacin
(105 mol l1) for approximately 10 min
prior to being constricted with endothelin-1 (ET-1; 108 mol
l1), and at the point of maximal vasoconstriction, the
ionophore (3x106 mol l1) was added.
Pre-incubation with indomethacin or disruption of the endothelium abolished
the dilation induced by the addition of the ionophore
(3x106 mol l1; N=3).