Summary
The localization of estrogen receptors (ER) in osteogenic cells during the early stage of medullary bone osteogenesis was studied immunohistochemically in the femurs of estrogen-treated male Japanese quail. Alkaline phosphatase (ALP) activity was used as a marker for osteogenic cells. ER immunostaining was observed in the nuclei of weak ALP-positive bone lining cells on the endosteal bone surface of nontreated birds. After 24 hours of estrogen treatment, nuclear immunostaining was detected in ALP-positive preosteoblasts on the endosteal bone surface. After 48 hours, the medullary bone appeared to some degree along the endosteal surface. ER immunostaining was observed in the nuclei of ALP-positive osteoblasts on the medullary bone surface. This study demonstrates that ER are present in osteogenic cells, and suggests that estrogen directly acts on medullary bone osteogenesis.
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Ohashi, T., Kusuhara, S. & Ishida, K. Estrogen target cells during the early stage of medullary bone osteogenesis: Immunohistochemical detection of estrogen receptors in osteogenic cells of estrogen-treated male Japanese quail. Calcif Tissue Int 49, 124–127 (1991). https://doi.org/10.1007/BF02565134
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DOI: https://doi.org/10.1007/BF02565134