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Endocrinology, Vol 137, 2075-2084, Copyright © 1996 by Endocrine Society
ARTICLES |
NN Yang, HU Bryant, S Hardikar, M Sato, RJ Galvin, AL Glasebrook and JD Termine
Endocrine Research, Lilly Research Laboratories, Eli Lilly & Co., Indianapolis, Indiana 46285, USA.
Estrogen or raloxifene (LY156758) prevent estrogen deficiency-induced bone loss in animals and humans. We demonstrated in the rat that a 22% reduction in bone mineral density generated by ovariectomy was associated with a 2-fold reduction of transforming growth factor-beta 3 (TGF beta 3) messenger RNA expression in the femur. Administration of 17 beta-estradiol or raloxifene to ovariectomized rats restored both bone mineral density and TGF beta 3 messenger RNA expression in the femur to levels measured in intact animals. In transient transfection assays, the promoter sequence from -38 to + 110 of the human TGF beta 3 gene, which contains no palindromic estrogen response element, was sufficient to mediate 17 beta-estradiol or raloxifene induced-reporter gene expression in presence of the estrogen receptor. Raloxifene activated TGF beta 3 promoter as a full agonist at nanomolar concentrations. In the same cellular system, raloxifene inhibited the estrogen response element-containing vitellogenin promoter expression as a pure estrogen antagonist. In two well characterized osteoclast differentiation models, TGF beta 3 significantly inhibited the differentiation and bone-resorptive activities of murine and avian osteoclasts. These findings suggest that regulation of TGF beta 3 gene expression by raloxifene or estrogen in bone may be an important target to mediate bone maintenance.
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