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Abstract

Inhibition of thalidomide teratogenicity by acetylsalicylic acid: evidence for prostaglandin H synthase-catalyzed bioactivation of thalidomide to a teratogenic reactive intermediate.

R R Arlen and P G Wells
Journal of Pharmacology and Experimental Therapeutics June 1996, 277 (3) 1649-1658;
R R Arlen
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P G Wells
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Abstract

Thalidomide is a teratogenic sedative-hypnotic drug that is structurally similar to phenytoin, which is thought to be bioactivated by prostaglandin H synthase (PHS) and other peroxidases to a teratogenic reactive intermediate. The relevance of this mechanism to thalidomide teratogenicity was evaluated in pregnant New Zealand White rabbits treated with thalidomide at 11:00 A.M. on gestational days 8 to 11, with day 0 indicating the time when sperm were observed in the vaginal fluid. Thalidomide (7.5 mg/kg i.v.) produced mainly fetal limb anomalies analogous to those observed in humans. Thalidomide (25-200 mg/kg i.p.), produced a dose-related increase in a spectrum of fetal anomalies, and in postpartum lethality, but did not produce a reliable incidence of limb anomalies. In subsequent studies, pregnant does received the irreversible PHS inhibitor acetylsalicylic acid (ASA), 75 mg/kg i.p., or its vehicle, followed 2 hr later by thalidomide, 7.5 mg/kg i.v., or its vehicle. ASA pretreatment was remarkably embryoprotective, resulting in respective 61.2 and 61.4% decreases in thalidomide-initiated fetal limb anomalies (P = .002) and postpartum fetal lethality (P < .02), and a small but significant reduction in thalidomide-initiated fetal weight loss. ASA alone did not produce significant embryopathy. These results show that ASA can protect the embryo from thalidomide teratogenicity, suggesting that thalidomide may be bioactivated by PHS to a teratogenic reactive intermediate.

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Journal of Pharmacology and Experimental Therapeutics
Vol. 277, Issue 3
1 Jun 1996
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Abstract

Inhibition of thalidomide teratogenicity by acetylsalicylic acid: evidence for prostaglandin H synthase-catalyzed bioactivation of thalidomide to a teratogenic reactive intermediate.

R R Arlen and P G Wells
Journal of Pharmacology and Experimental Therapeutics June 1, 1996, 277 (3) 1649-1658;

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Abstract

Inhibition of thalidomide teratogenicity by acetylsalicylic acid: evidence for prostaglandin H synthase-catalyzed bioactivation of thalidomide to a teratogenic reactive intermediate.

R R Arlen and P G Wells
Journal of Pharmacology and Experimental Therapeutics June 1, 1996, 277 (3) 1649-1658;
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