Chronic stress increases estrogen and other steroids in inseminated rats.

Abstract:

:Physical restraint, like many other stressors, can block early pregnancy, but the underlying physiological mechanisms have not been established. Exogenous estrogens in minute doses will also block early pregnancy. In the present study, female rats were exposed to 5 h of restraint daily for the first 5 days after insemination. A subset of animals was sacrificed after 1, 2, 3, 4, and 5 days of restraint, and blood was collected for radioimmunoassay. Blood was also collected from unstressed control animals on each of the first 5 days after insemination. Plasma concentrations of estradiol, as well as those of corticosterone and progesterone, were increased in the stressed animals as compared to the controls. The finding of significantly enhanced maternal estrogen suggests the possibility that estrogens mediate psychogenic pregnancy blocks.

journal_name

Physiol Behav

journal_title

Physiology & behavior

authors

MacNiven E,deCatanzaro D,Younglai EV

doi

10.1016/0031-9384(92)90446-9

subject

Has Abstract

pub_date

1992-07-01 00:00:00

pages

159-62

issue

1

eissn

0031-9384

issn

1873-507X

pii

0031-9384(92)90446-9

journal_volume

52

pub_type

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