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• W4384202690 abstract "ABSTRACT Estrogen regulates bone mass in women and men, but the underlying cellular mechanisms of estrogen action on bone remain unclear. Although both estrogen receptor (ER)α and ERβ are expressed in bone cells, ERα is the dominant receptor for skeletal estrogen action. Previous studies using either global or cell‐specific ERα deletion provided important insights, but each of these approaches had limitations. Specifically, either high circulating sex steroid levels in global ERα knockout mice or the effects of deletion of ERα during growth and development in constitutive cell‐specific knockout mice have made it difficult to clearly define the role of ERα in specific cell types in the adult skeleton. We recently generated and characterized mice with tamoxifen‐inducible ERα deletion in osteocytes driven by the 8‐kb Dmp1 promoter (ERαΔOcy mice), revealing detrimental effects of osteocyte‐specific ERα deletion on trabecular bone volume (−20.1%) and bone formation rate (−18.9%) in female, but not male, mice. Here, we developed and characterized analogous mice with inducible ERα deletion in osteoclasts using the Cathepsin K promoter (ERαΔOcl mice). In a study design identical to that with the previously described ERαΔOcy mice, adult female, but not male, ERαΔOcl mice showed a borderline (−10.2%, p = 0.084) reduction in trabecular bone volume, no change in osteoclast numbers, but a significant increase in serum CTx levels, consistent with increased osteoclast activity. These findings in ERαΔOcl mice differ from previous studies of constitutive osteoclast‐specific ERα deletion, which led to clear deficits in trabecular bone and increased osteoclast numbers. Collectively, these data indicate that in adult mice, estrogen action in the osteocyte is likely more important than via the osteoclast and that ERα deletion in osteoclasts from conception onward has more dramatic skeletal effects than inducible osteoclastic ERα deletion in adult mice. © 2023 The Authors. JBMR Plus published by Wiley Periodicals LLC on behalf of American Society for Bone and Mineral Research." @default.
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• W4384202690 date "2023-07-13" @default.
• W4384202690 modified "2023-10-18" @default.
• W4384202690 title "Modest Effects of <scp>Osteoclast‐Specific ERα</scp> Deletion after Skeletal Maturity" @default.
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• W4384202690 doi "https://doi.org/10.1002/jbm4.10797" @default.
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• W4384202690 hasPublicationYear "2023" @default.
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