Abstract
Two lines of mice divergently selected from the control strain (CBi) against the positive phenotypic correlation between body weight (b.w.) and tail (skeletal) length were obtained (CBi/C: high weight, short tail; CBi/L: low weight, long tail). The selected animals showed a different relationship between body and skeletal masses. To compare the adequacy between biomass and load-bearing ability of the skeleton, and to describe the eventual role of bone mechanostat in the production of these changes, cross-sectional and bending properties of both femur diaphyses were determined in CBi, CBi/C, and CBi/L adult mice of both genders. Cortical bone material quality (elastic modulus) was reduced in the selected lines (p < 0.001), significantly less in CBi/C than in CBi/L. In contrast, cross-sectional design (b.w.-adjusted values of moment of inertia, CSMI) was largely improved (p < 0.001), significantly more in CBi/C than in CBi/L. These effects determined a greater stiffness and strength in CBi/C than in CBi/L or CBi weight-paired mice. The elevations of the negative regression lines between elastic modulus and CSMI ("distribution/quality" curves) decreased in the order CBi/C > CBi/L > CBi. Data show that selection improved diaphyseal...Continue Reading
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