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(Hypertension. 1997;29:494.)
© 1997 American Heart Association, Inc.
State-of-the-Art-Lecture |
Gonadal Hormones Modulate Deoxycorticosterone-Salt Hypertension in Male and Female Rats
From the Department of Physiology and Biophysics, University of Tennessee, Memphis.
Correspondence to Joan T. Crofton, Department of Physiology and Biophysics, University of Tennessee, Memphis, 894 Union Ave, Memphis, TN 38163 E-mail jcrofton{at}physiol.utmem.edu
We have shown previously that, in rats with deoxycorticosterone (DOC)-salt hypertension, arterial blood pressure rises more rapidly and reaches a higher level in male than in female rats and that the course of the hypertension was ameliorated by gonadectomy in male rats and exacerbated by gonadectomy in female rats. The present investigation was undertaken to examine the role of the gonadal steroid hormones in modulating the course of DOC-salt hypertension in the rat. Our previous findings with respect to the effects of gender and gonadectomy on DOC-salt hypertension were confirmed in this study. Chronic treatment with gonadal steroids was begun 1 week before the start of the DOC-salt protocol. 17ß-Estradiol attenuated the course of the hypertension in intact male rats and in gonadectomized females. Testosterone exacerbated the development of the hypertension in gonadectomized male rats but was without effect in intact females. Progesterone alone had no effect on the hypertension in ovariectomized rats but when given to ovariectomized rats in combination with estradiol transiently prevented the ameliorating effect of the estradiol. These effects of the gonadal steroid hormones could not be attributed to effects of saline intake. Thus, these findings demonstrate that the gonadal steroid hormones play an important role in modulating the pathogenesis of DOC-salt hypertension in the rat. It is suggested that the effects of the gonadal hormones on the course of the hypertension may be due to modulation of the cardiovascular and renal actions of vasopressin, since vasopressin is required for this model of hypertension.
Key Words: gender differences • sex steroids • DOC-salt hypertension
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