RT Journal Article
SR Electronic
T1 Cysteinyl Leukotrienes Induce P-Selectin Expression in Human Endothelial Cells <em>via</em> a Non-<em>Cys</em>LT<sub>1</sub> Receptor-Mediated Mechanism
JF Journal of Pharmacology and Experimental Therapeutics
JO J Pharmacol Exp Ther
FD American Society for Pharmacology and Experimental Therapeutics
SP 655
OP 662
VO 281
IS 2
A1 Pedersen, Karen E.
A1 Bochner, Bruce S.
A1 Undem, Bradley J.
YR 1997
UL http://jpet.aspetjournals.org/content/281/2/655.abstract
AB Cysteinyl leukotrienes are bioactive lipid mediators known to possess potent proinflammatory actions. Included in these are effects on vascular endothelium to promote surface expression of the adhesion molecule P-selectin. In the present study we were interested in investigating the receptor mechanism(s) involved in cysteinyl leukotriene-induced endothelial P-selectin expression. As such we examined the effect of several potent and selective cysteinyl leukotriene receptor antagonists on this response. Incubation of cultured human umbilical vein endothelial cells (HUVEC) with the cysteinyl leukotrienes leukotriene C4 (LTC4) or leukotriene D4 (LTD4) induced surface expression of P-selectin which was concentration dependent and rapid in onset. Expression of endothelial P-selectin induced by either LTC4 or LTD4 was not blocked however by pretreatment of HUVEC with the selective cysteinyl leukotriene-1 (CysLT1) receptor antagonists SKF 104353, pranlukast or zafirlukast before agonist exposure. In contrast, SKF 104353 effectively antagonized the LTC4-induced contractions in isolated human bronchial smooth muscle preparations, shifting the agonist dose-response curve to the right by some 3 log-fold in this tissue. The present results suggest that cysteinyl leukotrienes induce surface expression of endothelial P-selectinvia a mechanism independent of theCysLT1 receptor. The American Society for Pharmacology and Experimental Therapeutics