Abstract
The application of lanthanum (La) in industry, medicine, and agriculture may cause accumulation of the element in human body. This article examines the effects of La on the femur bone mineral of male Wistar rats after administration of La(NO3)3 by gavage at the dose of 2.0 mg La(NO3)3 · kg−1 · day−1 over a 6-month period. Chemical analysis confirmed La accumulation in bone and loss in bone mineral. Thermogravimetric analysis showed a decrease in the mineral-to-matrix ratio and an increase in carbonate content. Fourier-transform infrared spectrometry revealed elevation in the contents of labile carbonate and acidic phosphate. The synchrotron radiation small-angle X-ray scattering study presented a smaller mean thickness of the mineral crystals in the bone of La-treated rats. The synchrotron radiation-extended X-ray absorption fine structure analysis indicated that the La treatment resulted in a lowered disorder in the crystals. The smaller size, more adsorbed labile carbonate, and more acidic phosphate made the bone mineral easier to dissolve, as revealed in the kinetic measurement of bone demineralization. These findings suggest that La retards bone maturation of rats.
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This study was supported by National Natural Science Foundation of China (grants 20271005 and 20571006).
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Huang, J., Zhang, TL., Xu, SJ. et al. Effects of Lanthanum on Composition, Crystal Size, and Lattice Structure of Femur Bone Mineral of Wistar Rats. Calcif Tissue Int 78, 241–247 (2006). https://doi.org/10.1007/s00223-005-0294-2
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DOI: https://doi.org/10.1007/s00223-005-0294-2