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Endocrinology, Vol 112, 1122-1126, Copyright © 1983 by Endocrine Society

ARTICLES

Radioimmunoassay of 2-hydroxyestrone in plasma during the estrous cycle of the rat: interrelationships with estradiol, progesterone, and the gonadotropins

DJ Cecchini, SC Chattoraj, AS Fanous, SK Panda, TF Brennan and KC Edelin

A RIA for 2-hydroxyestrone (2-OHE1) in rat plasma has been developed. The assay employs an antiserum that is specific for catechol estrogens. Specificity is further ensured by purification of plasma extracts on Sephadex LH-20 columns before RIA. Blood was collected at 0 C in the presence of ascorbic acid to prevent oxidation. Under these conditions, the conversion of 2-OHE1 to methylated derivatives was found to be negligible. Plasma 2-OHE1, LH, FSH, PRL, estradiol, and progesterone were measured at 3-h intervals throughout the 4-day estrous cycle of the rat. The 2-OHE1 concentration varied from undetectable to 11 pg/ml plasma. No clearly defined relationship with the other hormones analyzed was observed. Thus, it is unlikely that changes in circulating 2-OHE1 levels are involved in the regulation of the gonadotropin surge and ovulation.


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Copyright © 1983 by The Endocrine Society