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Estrogens reduce bone loss in the ovariectomized, lactating rat model
S C Garner1, J J Anderson, M H Mar
1Department of Nutrition, School of Public Health, University of North Carolina, Chapel Hill 27599-7400.
Bone and Mineral
|October 1, 1991
Summary
Estrogen therapy significantly preserves bone mineral mass in ovariectomized, lactating rats. This study demonstrates estrogen
Area of Science:
- Endocrinology
- Bone Biology
- Reproductive Physiology
Background:
- Lactation and ovariectomy induce significant bone mineral loss.
- Estrogen plays a crucial role in maintaining bone homeostasis.
Purpose of the Study:
- To investigate the efficacy of estrogen treatment in preventing bone loss during lactation in ovariectomized rats.
- To compare the effects of different estrogen formulations and doses on bone mineral retention.
Main Methods:
- Ovariectomized, lactating rats were treated with 17 beta-estradiol (pellets or injections) or estrone.
- Bone mineral mass was assessed by bone ash weight in femurs.
- Serum estradiol levels were measured.
Main Results:
- Estrogen treatment improved bone mineral mass retention by 15-25% compared to vehicle controls.
- Doses of 5 and 16 micrograms/day of estradiol benzoate significantly increased bone mineral retention.
- Estrone also improved bone retention, but higher doses were required compared to estradiol.
Conclusions:
- Estrogen therapy effectively reduces bone mineral loss associated with lactation in ovariectomized rats.
- Both 17 beta-estradiol and estrone demonstrate bone-protective effects.
- Dose-dependent efficacy of estradiol in preserving bone mass was observed.