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- W2111551750 abstract "Long-term diabetes in female rats preserves the bone mineral density (BMD) but impairs the strength of the femur. In this study, we have compared the effects of diabetes and high-dose 17 beta-estradiol (E2), two conditions of low bone formation, in ovariectomized (ovx) rats. Spontaneously diabetic BB rats were ovx 0-3 days after onset, and nondiabetic ovx littermates were used as controls; the rats were either untreated or treated with E2 (30 micrograms/day, subcutaneously), for 6 or 12 weeks (n = 9 in each of the eight groups). Analysis included: plasma 1,25-dihydroxyvitamin D3, insulin-like growth factor-I (IGF-I), and osteocalcin concentrations; histomorphometry of the proximal tibial metaphysis (PTM); and DXA and biomechanical testing of the femur. Both E2 treatment and diabetes markedly lowered plasma IGF-I and osteocalcin concentrations, as well as dynamic morphometric parameters of bone formation in the PTM. Plasma IGF-I and osteocalcin were correlated (R2 = 0.55; p < 0.0001). E2 treatment in both control and diabetic ovx rats increased the trabecular bone volume in the PTM and the BMD in the metaphysis of the distal femur; there was no difference between control and diabetic rats, however. The diaphyseal area and BMC were decreased in E2-treated or/and diabetic ovx rats, but the diaphyseal BMD remained unchanged compared with untreated ovx rats. The biomechanical properties of the whole femur (strength, angular deformation, and stiffness) were decreased in E2-treated and diabetic E2-treated ovx rats after 12 weeks. The data indicate that in situations of chronic low bone formation, whole bone strength does not reflect total BMD but correlates better with bone size and bone mineral content measurements." @default.
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- W2111551750 date "1997-05-01" @default.
- W2111551750 modified "2023-10-11" @default.
- W2111551750 title "Effects of long-term diabetes and/or high-dose 17β-estradiol on bone formation, bone mineral density, and strenght in ovariectomized rats" @default.
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- W2111551750 doi "https://doi.org/10.1016/s8756-3282(97)00029-x" @default.
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