Arteriosclerosis, Vol 10, 1051-1057, Copyright © 1990 by American Heart Association
ARTICLES |
MR Adams, JR Kaplan, SB Manuck, DR Koritnik, JS Parks, MS Wolfe and TB Clarkson
Department of Comparative Medicine, Bowman Gray School of Medicine, Wake Forest University, Winston-Salem, North Carolina 27103.
Although controversy continues, the preponderance of evidence indicates that estrogen replacement therapy favorably influences the risk of coronary heart disease in postmenopausal women. It remains uncertain how this effect is mediated and whether the cyclic addition of a progestin may influence adversely an estrogen-related cardioprotective effect. We investigated the influence of sex hormone replacement therapy on diet-induced coronary artery atherosclerosis in estrogen- deficient (ovariectomized) adult female cynomolgus monkeys. Monkeys were assigned randomly to one of three treatment groups: 1) no hormone replacement (n = 17), 2) continuously administered 17-beta estradiol plus cyclically administered progesterone (n = 20), and 3) continuously administered 17-beta estradiol (n = 18). The physiologic patterns of plasma estradiol and progesterone concentrations were maintained by administering the hormones in sustained-release subcutaneous Silastic implants. The experiment lasted 30 months. At necropsy, coronary artery atherosclerosis was inhibited similarly (reduced by approximately one- half) in animals in both hormone replacement groups (p less than or equal to 0.05). Antiatherogenic effects of hormone replacement were independent of variation in total plasma cholesterol, lipoprotein cholesterol, apoprotein A-1 and B concentrations, high density lipoprotein subfraction heterogeneity, and low density lipoprotein molecular weight. We conclude that physiologic estrogen replacement therapy with or without added progesterone inhibits atherosclerosis progression in ovariectomized monkeys. This may explain why estrogen replacement therapy results in reduced risk of coronary heart disease in postmenopausal women.
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