DIURNAL VARIATION IN THE INDUCIBILITY OF LUTEAL 20α-HYDROXYSTEROID DEHYDROGENASE IN PREGNANT RATS

in Journal of Endocrinology
Authors:
DAVID HICKMAN-SMITH
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N. J. KUHN
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SUMMARY

Luteolysis was induced in rats during late pregnancy by fetoplacental removal, and was monitored by the increased activity of luteal 20α-hydroxysteroid dehydrogenase (20α-OHSDH). The extent of enzyme induction over a given length of time varied according to the time of day at which the fetuses and placentae were removed, 11.00 and 21.00 h appearing to give optimal and minimal enzyme activities respectively. The 20α-OHSDH was more readily induced on day 19 than on day 18.

 

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