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Published in: Calcified Tissue International 2/2005

01-08-2005

Abnormal Response to Physical Activity in Femurs after Heterozygous Inactivation of One Allele of the Col2a1 Gene for Type II Collagen in Mice

Authors: J. Nieminen, J. Sahlman, T. Hirvonen, T. Jämsä, J. Tuukkanen, V. Kovanen, H. Kröger, J. Jurvelin, M. Arita, S. W. Li, D.J. Prockop, M. M. Hyttinen, H. J. Helminen, T. Lapveteläinen, K. Puustjärvi

Published in: Calcified Tissue International | Issue 2/2005

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Abstract

The objective of this study was to evaluate the influence of heterozygous inactivation of one allele of the type II collagen gene (Col2a1) on biomechanical properties and mineral density of bone under physical loading conditions. C57BL/6−TGN mice with heterozygous knockout (HZK) inactivation of Col2a1 gene and their nontransgenic littermate controls were housed in individual cages with running wheels for 9 and 15 months. The running activity of each mouse was monitored continuously throughout the experiment. Bone mineral density (BMD) of mice femora was measured using dual-energy X-ray absorptiometry (DXA) and peripheral quantitative computerized tomography (pQCT). Biomechanical properties were determined using three-point bending tests. Vertebral bone samples were prepared for quantitative polarized light microscopy and digital densitometry of proteoglycans. The concentration of total collagen and collagen cross-links were analyzed using high-performance liquid chromatograpy (HPLC).
The average daily running distance was shorter for the HZK mice between the age of 4 and 15 months as compared with normal runners (P < 0.05). The ultimate breaking force was 14.8% and 23.6% (9 vs. 15 months) lower in HZK-runners than in wild-type runners. BMD of the femur was 6.1% lower in HZK-runners at the age of 9 months (P < 0.05). Physical activity increased cortical BMD in wild-type runners but not in the HZK runners at the age of 9 months. The collagen network of the HZK mice was less organized. There were only minor changes in BMD and mechanical and structural properties between sedentary HZK mice and their wild-type controls. Increased physical activity induced significantly lower bone density, mechanical properties, and organization of collagen fibers in male HZK mice. However, there were no major differences in biomechanical parameters between sedentary HZK and wild-type male mice. This suggests an important guiding role of collagen type II in bone remodelling and maturation.
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Metadata
Title
Abnormal Response to Physical Activity in Femurs after Heterozygous Inactivation of One Allele of the Col2a1 Gene for Type II Collagen in Mice
Authors
J. Nieminen
J. Sahlman
T. Hirvonen
T. Jämsä
J. Tuukkanen
V. Kovanen
H. Kröger
J. Jurvelin
M. Arita
S. W. Li
D.J. Prockop
M. M. Hyttinen
H. J. Helminen
T. Lapveteläinen
K. Puustjärvi
Publication date
01-08-2005
Publisher
Springer-Verlag
Published in
Calcified Tissue International / Issue 2/2005
Print ISSN: 0171-967X
Electronic ISSN: 1432-0827
DOI
https://doi.org/10.1007/s00223-004-0069-1

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