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Bone matrix quality and plasma homocysteine levels
S Blouin1, H W Thaler, C Korninger
14th Medical Department, Ludwig Boltzmann Institute of Osteology, Hanusch Hospital of WGKK, AUVA Trauma Centre Meidling, Hanusch Hospital, Austria.
Bone
|January 27, 2009
Summary
High homocysteine levels significantly correlate with altered collagen cross-linking in bone, impacting bone quality. This study investigated plasma homocysteine and bone material properties in elderly fracture patients.
Area of Science:
- Biochemistry
- Orthopedics
- Gerontology
Background:
- Elevated homocysteine is linked to fracture risk, though findings vary.
- Bone strength relies on both quantity and quality.
- Understanding homocysteine's impact on bone quality is crucial.
Purpose of the Study:
- To investigate correlations between plasma homocysteine levels and bone material properties.
- Specifically examining collagen cross-link ratio and bone mineralization density distribution (BMDD).
Main Methods:
- Femoral head bone samples from 19 elderly female fracture patients were analyzed.
- Collagen cross-link ratio (pyridinoline/divalent) determined by Fourier Transform Infrared Imaging (FTIRI).
- Bone Mineral Density Distribution (BMDD) quantified using quantitative Backscattered Electron Imaging (qBEI).
Main Results:
- Significant correlation found between plasma homocysteine and collagen cross-link ratio in primary mineralized bone (p<0.0001).
- No correlation observed between homocysteine and collagen cross-links on trabecular bone surfaces.
- No correlation found between plasma homocysteine and any BMDD parameters (p>0.05).
Conclusions:
- Homocysteine influences bone quality by affecting collagen post-translational modifications.
- These changes are independent of bone mineral characteristics.
- Findings suggest a mechanism for homocysteine's effect on bone quality, with a caveat regarding the fracture patient cohort.
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