Journal
BONE
Volume 30, Issue 1, Pages 18-25Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/S8756-3282(01)00643-3
Keywords
estradiol; knockout mice; bone remodeling; bone mineral density (BMD); estrogen receptors (ERs)
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Funding
- NIDCR NIH HHS [DE04724] Funding Source: Medline
- NATIONAL INSTITUTE OF DENTAL &CRANIOFACIAL RESEARCH [R01DE004724, R37DE004724] Funding Source: NIH RePORTER
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To determine the contributions of estrogen receptor (ER)a and ERbeta in bone growth and remodeling in male and female mice, we generated and analyzed full knockouts for each receptor, and a double ER knockout. Although suppression of the ligand to the ERs (i.e., estradiol) after menopause or gonadectomy in females led to a catastrophic increase in bone turnover and concomitant bone loss, deletion of one or both ERs failed to show such an effect. Complete deletion of ERalpha led to a decrease, not an increase, in bone turnover and an increase, not a decrease, in trabecular bone volume in both male and female animals. Deletion of ERbeta led to different responses in males, where bone was unaffected, and in females, where bone resorption was decreased and trabecular bone volume increased. In contrast, deletion of both ERs led to a profound decrease in trabecular bone volume in females, which was associated with a decrease, not an increase, in bone turnover. Finally, deletion of ERalpha, but not ERbeta, led to major changes in circulating levels of estradiol and/or testosterone, indirectly affecting bone remodeling and bone mass. Thus, only ERalpha was shown to regulate bone remodeling in males, whereas in females both receptor subtypes influenced this process and could, at least under basal knockout conditions, compensate for each other. (C) 2002 by Elsevier Science Inc. All rights reserved.
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