10848516

pubmed:Citation

6

Nonselective cyclooxygenase (COX) inhibitors are potent tocolytic agents; however, they also have adverse fetal effects such as constriction of the fetal ductus arteriosus. Recently, selective COX-2 inhibitors have been used in the management of preterm labor in the hope of avoiding fetal complications. However, both COX-1 and -2 are expressed by cells of the ductus arteriosus. We used fetal lambs (0.88 gestation) to assess the ability of selective COX-2 inhibitors celecoxib and NS398 to affect the ductus arteriosus. Both selective COX-2 inhibitors decreased PGE(2) and 6ketoPGF(1alpha) production in vitro; both inhibitors constricted the isolated ductus in vitro. The nonselective COX-1/COX-2 inhibitor indomethacin produced a further reduction in PG release and an additional increase in ductus tension in vitro. We used a prodrug of celecoxib to achieve 1.4 +/- 0.6 microg/ml, mean +/- standard deviation, of the active drug in vivo. This concentration of celecoxib produced both an increase in pressure gradient and resistance across the ductus; celecoxib also decreased fetal plasma concentrations of PGE(2) and 6ketoPGF(1alpha). Indomethacin (0.7 +/- 0.2 microg/ml) produced a significantly greater fall in ductus blood flow than celecoxib and tended to have a greater effect on ductus resistence in vivo. We conclude that caution should be used when recommending COX-2 inhibitors for use in pregnant women, because COX-2 appears to play a significant role in maintaining patency of the fetal ductus arteriosus.

eng

IM

MEDLINE

0363-6119

Print

NLM

R1496-505

pubmed-meshheading:10848516-6-Ketoprostaglandin F1 alpha, pubmed-meshheading:10848516-Animals, pubmed-meshheading:10848516-Cyclooxygenase 1, pubmed-meshheading:10848516-Cyclooxygenase 2, pubmed-meshheading:10848516-Cyclooxygenase 2 Inhibitors, pubmed-meshheading:10848516-Cyclooxygenase Inhibitors, pubmed-meshheading:10848516-Dinoprostone, pubmed-meshheading:10848516-Ductus Arteriosus, pubmed-meshheading:10848516-Epoprostenol, pubmed-meshheading:10848516-Female, pubmed-meshheading:10848516-Hemodynamics, pubmed-meshheading:10848516-Indomethacin, pubmed-meshheading:10848516-Isoenzymes, pubmed-meshheading:10848516-Nitrobenzenes, pubmed-meshheading:10848516-Nitroprusside, pubmed-meshheading:10848516-Oxygen, pubmed-meshheading:10848516-Pregnancy, pubmed-meshheading:10848516-Prostaglandin-Endoperoxide Synthases, pubmed-meshheading:10848516-Pulmonary Artery, pubmed-meshheading:10848516-Pyrazoles, pubmed-meshheading:10848516-Sheep, pubmed-meshheading:10848516-Sulfonamides, pubmed-meshheading:10848516-Vasoconstriction, pubmed-meshheading:10848516-Vasodilator Agents

Cyclooxygenase-2 inhibitors constrict the fetal lamb ductus arteriosus both in vitro and in vivo.

Journal Article, In Vitro, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't