Endocrinology, Vol 128, 1749-1753, Copyright © 1991 by Endocrine Society

ARTICLES

In vivo generation of hydrogen peroxide in the rat corpus luteum during luteolysis

JC Riley and HR Behrman
Department of Obstetrics and Gynecology, Yale University School of Medicine, New Haven, Connecticut 06510-8063.

The hypothesis that hydrogen peroxide generation occurs in the corpora lutea of superovulated rats during luteolysis was tested using a peroxide-dependent inhibitor of catalase, 3-amino-1,2,4-triazole (AT). Luteal regression was induced during midpseudopregnancy by injection of 500 micrograms prostaglandin F2 alpha (PGF2 alpha) 1 h before administration of AT (0.1 g/kg, ip) and was confirmed by progesterone analysis of peripheral blood serum. Within groups of both PGF2 alpha- treated and untreated control rats, other rats also received ethanol (0.2 g/kg, ip), which prevents hydrogen peroxide-mediated inhibition of catalase by AT. Diluted homogenates of ovaries removed 1 h after AT administration were assayed for catalase activity by measuring the decrease in absorbance at 240 nm for 30 sec after the addition of hydrogen peroxide (10 mM). Ethanol-sensitive catalase inhibition by AT was significantly higher (47.9 +/- 3.38%) in samples from PGF2 alpha- treated groups than in controls (23.1 +/- 4.82%; P less than 0.01; n = 9). Similar increases in catalase inhibition by AT were found in luteal tissue of rats treated with PGF2 alpha 24 h earlier and in rats in which luteolysis was allowed to occur spontaneously in late pseudopregnancy. Hemoglobin an AT assays revealed that the changes in catalase activity were not the result of altered blood contamination or AT concentration in the luteal homogenates. Since catalase inhibition by AT is only seen in the presence of hydrogen peroxide, these results support the conclusion that an early and sustained component of corpus luteum regression is the generation of hydrogen peroxide in luteal tissue.

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