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The purpose of the current report is to compare the skeletal effects of PTH treatment at red (hematopoietic) and yellow (fatty) marrow sites in ovariectomized (ovx) rats. In the first study, mature, slowly growing ovx rats that were 4 months of age and 4 weeks postovariectomy were treated with human parathyroid hormone [hPTH(1-34)] (80 μg/kg, 5 days/week) for 6 weeks. In the second study, aged ovx...
In the ovariectomized (ovx) rat, the nonsteroidal antiestrogens, clomiphene (CLO) and tamoxifen (TAM), at dose levels that prevent development of osteopenia to a degree approaching that of 17β-estradiol are, in contrast to 17β-estradiol, only weakly uterotrophic. Metabolites of CLO and TAM might contribute differentially to these effects. Thus, we have evaluated bone protective and uterine effects...
To characterize osteopenic changes in the femoral neck of ovariectomized (ovx) rats, female Sprague-Dawley rats were ovx or sham operated upon at 3 months of age and killed at various times from 0 to 360 days postsurgery. Quantitative bone histomorphometry was performed on undecalcified longitudinal sections of the proximal femur from each rat. This skeletal site was found to be slowly growing, as...
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