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傅里叶变换红外成像显微光谱技术和组织水平力学测试揭示了小鼠骨矿物质和基质组成的种内差异。

Fourier transform infrared imaging microspectroscopy and tissue-level mechanical testing reveal intraspecies variation in mouse bone mineral and matrix composition.

作者信息

Courtland Hayden-William, Nasser Philip, Goldstone Andrew B, Spevak Lyudmila, Boskey Adele L, Jepsen Karl J

机构信息

Division of Endocrinology, Diabetes, and Bone Diseases, Mount Sinai School of Medicine, New York, NY, USA.

出版信息

Calcif Tissue Int. 2008 Nov;83(5):342-53. doi: 10.1007/s00223-008-9176-8. Epub 2008 Oct 15.

Abstract

Fracture susceptibility is heritable and dependent upon bone morphology and quality. However, studies of bone quality are typically overshadowed by emphasis on bone geometry and bone mineral density. Given that differences in mineral and matrix composition exist in a variety of species, we hypothesized that genetic variation in bone quality and tissue-level mechanical properties would also exist within species. Sixteen-week-old female A/J, C57BL/6J (B6), and C3H/HeJ (C3H) inbred mouse femora were analyzed using Fourier transform infrared imaging and tissue-level mechanical testing for variation in mineral composition, mineral maturity, collagen cross-link ratio, and tissue-level mechanical properties. A/J femora had an increased mineral-to-matrix ratio compared to B6. The C3H mineral-to-matrix ratio was intermediate of A/J and B6. C3H femora had reduced acid phosphate and carbonate levels and an increased collagen cross-link ratio compared to A/J and B6. Modulus values paralleled mineral-to-matrix values, with A/J femora being the most stiff, B6 being the least stiff, and C3H having intermediate stiffness. In addition, work-to-failure varied among the strains, with the highly mineralized and brittle A/J femora performing the least amount of work-to-failure. Inbred mice are therefore able to differentially modulate the composition of their bone mineral and the maturity of their bone matrix in conjunction with tissue-level mechanical properties. These results suggest that specific combinations of bone quality and morphological traits are genetically regulated such that mechanically functional bones can be constructed in different ways.

摘要

骨折易感性具有遗传性,且取决于骨骼形态和质量。然而,对骨骼质量的研究通常因对骨骼几何形状和骨矿物质密度的强调而黯然失色。鉴于不同物种在矿物质和基质组成上存在差异,我们推测同一物种内骨骼质量和组织水平力学性能也会存在基因变异。使用傅里叶变换红外成像和组织水平力学测试分析了16周龄雌性A/J、C57BL/6J(B6)和C3H/HeJ(C3H)近交系小鼠的股骨,以研究矿物质组成、矿物质成熟度、胶原交联比和组织水平力学性能的变化。与B6相比,A/J股骨的矿物质与基质比率增加。C3H的矿物质与基质比率介于A/J和B6之间。与A/J和B6相比,C3H股骨中的酸性磷酸盐和碳酸盐水平降低,胶原交联比增加。模量值与矿物质与基质值平行,A/J股骨最硬,B6最软,C3H具有中等硬度。此外,各品系的破坏功也有所不同,矿化程度高且脆的A/J股骨破坏功最小。因此,近交系小鼠能够结合组织水平力学性能差异调节其骨矿物质组成和骨基质成熟度。这些结果表明,骨骼质量和形态特征的特定组合受基因调控,从而可以以不同方式构建具有力学功能的骨骼。

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