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Journal Article
Research Support, Non-U.S. Gov't
Skeletal effects of bazedoxifene paired with conjugated estrogens in ovariectomized rats.
Bone 2011 September
A novel approach to menopausal therapy is the tissue selective estrogen complex (TSEC) that partners bazedoxifene (BZA) with conjugated estrogens (CE). We examined the effects of daily treatment with BZA 0.3mg/kg, CE 2.5mg/kg, or combined BZA/CE (BZA 0.1, 0.3, or 1.0mg/kg with CE 2.5mg/kg) over 12months on bone mass, bone architecture and strength, and biochemical markers of bone turnover in ovariectomized (OVX) female Sprague-Dawley rats vs OVX control rats. Total cholesterol and uterine weights were also evaluated. All BZA/CE dose combinations prevented ovariectomy-induced increases in bone turnover and significantly increased bone mineral density (BMD) at the lumbar spine, proximal femur, and tibia compared with OVX controls. All BZA/CE doses evaluated also prevented many of the ovariectomy-induced changes of the static and dynamic parameters of the cortical compartment of the tibia and the cancellous compartment of the L1 and L2 vertebrae. All BZA/CE doses increased biomechanical strength at the lumbar spine (L4) compared with OVX animals. The co-administration of BZA 0.3 and 1.0mg/kg/day with CE 2.5mg/kg/day showed a dose-dependent reduction in uterine wet weight compared with administration of CE alone. All BZA/CE doses significantly lowered total cholesterol levels compared with OVX controls. In conclusion, 12months of treatment with BZA/CE in OVX rats effectively maintained BMD, bone microstructure, and bone quality; and the pairing of BZA with CE prevented CE-induced uterine stimulation.
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