Release and vasoconstrictor effect of leukotriene C-like immunoreactive material in the anaphylactic guinea-pig mesenteric vascular bed
Abstract
Antigen challenge of sensitized isolated guinea-pig mesentery perfused under constant pressure resulted in a significant flow reduction, which was paralleled by the release of leukotriene (LT)C4-like immunoreactivity into the perfusates. The lipoxygenase inhibitor quercetin inhibited the release of immunoreactive LTC4 and simultaneously abolished the antigen-induced mesenteric flow reduction. Mesenteric flow reduction was also observed after injection of exogenous LTC4. The results demonstrate that LTC4 is a constrictor of the mesenteric vascular bed and that endogenous LTC4-like immunoreactive material is a mediator of anaphylactic vasoconstriction in the guinea-pig mesentery.
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