Genetic Regulation of Cortical and Trabecular Bone Strength and Microstructure in Inbred Strains of Mice (original) (raw)

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Biomechanics and Biomaterials Research Center, Indiana University, Indianapolis, Indiana, U.S.A.

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Biomechanics and Biomaterials Research Center, Indiana University, Indianapolis, Indiana, U.S.A.

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Orthopedic Biomechanics Laboratory, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, U.S.A.

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Orthopedic Biomechanics Laboratory, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, U.S.A.

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Loma Linda University and Jerry L. Pettis Memorial VA Medical Center, Loma Linda, California, U.S.A.

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Maine Center for Osteoporosis Research and Education, Bangor, Maine, U.S.A.

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Connective Tissue Research Group, Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Canada

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The Jackson Laboratory, Bar Harbor, Maine, U.S.A.

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The Jackson Laboratory, Bar Harbor, Maine, U.S.A.

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Revision received:

08 December 1999

Accepted:

12 January 2000

Published:

02 December 2009

Cite

Charles H. Turner, Yeou‐Fang Hsieh, Ralph Müller, Mary L. Bouxsein, David J. Baylink, Clifford J. Rosen, Marc D. Grynpas, Leah Rae Donahue, Wesley G. Beamer, Genetic Regulation of Cortical and Trabecular Bone Strength and Microstructure in Inbred Strains of Mice, Journal of Bone and Mineral Research, Volume 15, Issue 6, 1 June 2000, Pages 1126–1131, https://doi.org/10.1359/jbmr.2000.15.6.1126
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Abstract

The inbred strains of mice C57BL/6J (B6) and C3H/HeJ (C3H) have very different femoral peak bone densities and may serve as models for studying the genetic regulation of bone mass. Our objective was to further define the bone biomechanics and microstructure of these two inbred strains. Microarchitecture of the proximal femur, femoral midshaft, and lumbar vertebrae were evaluated in three dimensions using microcomputed tomography (μCT) with an isotropic voxel size of 17 μm. Mineralization of the distal femur was determined using quantitative back‐scatter electron (BSE) imaging. μCT images suggested that C3H mice had thicker femoral and vertebral cortices compared with B6. The C3H bone tissue also was more highly mineralized. However, C3H mice had few trabeculae in the vertebral bodies, femoral neck, and greater trochanter. The trabecular number (Tb.N) in the C3H vertebral bodies was about half of that in B6 vertebrae (2.8−1 ± 0.1 mm−1 vs. 5.1−1 ± 0.2 mm−1; p < 0.0001). The thick, more highly mineralized femoral cortex of C3H mice resulted in greater bending strength of the femoral diaphysis (62.1 ± 1.2N vs. 27.4 ± 0.5N, p < 0.0001). In contrast, strengths of the lumbar vertebra were not significantly different between inbred strains (p = 0.5), presumably because the thicker cortices were combined with inferior trabecular structure in the vertebrae of C3H mice. These results indicate that C3H mice benefit from alleles that enhance femoral strength but paradoxically are deficient in trabecular bone structure in the lumbar vertebrae.

Copyright © 2000 ASBMR

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