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Estrogen plays an essential role in the development and maintenance of the skeleton; its effects are mediated via interactions with two estrogen receptor (ER) subtypes, alpha and beta. The aim of this study was to establish the cellular distribution of ERalpha and ERbeta in neonatal human rib bone. ERalpha and ERbeta immunoreactivity was seen in proliferative and prehypertrophic chondrocytes in the growth plate, with lower levels of expression in the late hypertrophic zone. Different patterns of expression of the two ERs were seen in bone. In cortical bone, intense staining for ERalpha was observed in osteoblasts and osteocytes adjacent to the periosteal-forming surface and in osteoclasts on the opposing resorbing surface. In cancellous bone, ERbeta was strongly expressed in both osteoblasts and osteocytes, whereas only low expression of ERalpha was seen in these areas. Nuclear and cytoplasmic staining for ERbeta was apparent in osteoclasts. These observations demonstrate distinct patterns of expression for the two ER subtypes in developing human bone and indicate functions in both the growth plate and mineralized bone. In the latter, ERalpha is predominantly expressed in cortical bone, whereas ERbeta shows higher levels of expression in cancellous bone.

Estrogen Receptors α and β Are Differentially Expressed in Developing Human Bone1

Estrogen Receptors α and β Are Differentially Expressed in Developing Human Bone¹