Material and mechanical properties of bones deficient for fibrillin-1 or fibrillin-2 microfibrils.
Material and mechanical properties of bones deficient for fibrillin-1 or fibrillin-2 microfibrils.
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DOI:
10.1016/j.matbio.2011.03.004
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发表时间:
2011-04
期刊:
影响因子:
6.9
通讯作者:
Ramirez, Francesco
中科院分区:
文献类型:
--
作者:
Arteaga-Solis, Emilio;Sui-Arteaga, Lee;Kim, Minwook;Schaffler, Mitchell B.;Jepsen, Karl J.;Pleshko, Nancy;Ramirez, Francesco
关键词:
The contribution of non-collagenous components of the extracellular matrix to bone strength is largely undefined. Here we report that deficiency of fibrillin-1 or fibrillin-2 microfibrils causes distinct changes in bone material and mechanical properties. Morphometric examination of mice with hypomorphic or null mutations in fibrillin-1 or fibrillin-2, respectively, revealed appreciable differences in the postnatal shaping and growth of long bones. Fourier transform infrared imaging spectroscopy indicated that fibrillin-1 plays a predominantly greater role than fibrillin-2 in determining the material properties of bones. Biomechanical tests demonstrated that fibrillin-2 exerts a greater positive influence on the mechanical properties of bone than fibrillin-1 assemblies. Published evidence indirectly supports the notion that the above findings are mostly, if not exclusively, related to the differential control of TGFβ family signaling by fibrillin proteins. Our study therefore advance our understanding of the role that extracellular microfibrils play in bone physiology and implicitly, in the pathogenesis of bone loss in human diseases caused by mutations in fibrillin-1 or -2.
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