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Structure and chemistry of bone mineral and matrix
Bone is heterogeneous, contains local areas which have just mineralized next to local areas which have been mineralized for longer periods of time. This heterogeneity renders analysis of whole bone misleading. We use the density fractionation technique to produce mineralization profiles in which newly-formed bone (low density fractions) can be separated from more mature bone, and we analyze the mineral and matrix m each fraction. In addition to chemical analyses we are using electron microscopy, X-ray and electron diffraction, neutron activation analysis and HPLC techniques. By studying the mineral-matrix interactions of the extracellular matrix of bone we are trying to understand the regulation of bone formation, mineralization and resorption.
Changes in Bone Mineral and Matrix with Age and Diseases
Mineralization profiles are a much more sensitive index of bone tissue age than the age of the animal. In normal physiological conditions there is a shift in the profile towards higher densities with aging. In pathological conditions either localized as in osteoarthritis or generalized as in osteoporosis subtle differences can be detected in the mineralization of the bone, confirming the view that in osteoporosis the nature of the bone changes as well as its quantity. We are correlating changes in bone tissue chemistry and architecture to bone mechanical strength.
Effects of Trace Elements and Drugs on Bone
It is possible to manipulate bones in to change their mineralization profile and therefore change their solubility and other material properties. We have shown that a high fluoride diet shifts bone mineralization profiles in rats as well as reducing bone solubility. We are also studying the affect of stable strontium on bone because strontium increases bone mass. In bisphosphonate treated animals we are studying the long term effects of lack of resorption on bone metabolism in animal models of arthritis and osteoporosis.
Research Interests
Papers共 394 篇Author StatisticsCo-AuthorSimilar Experts
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Connective tissue researchno. 4 (2023): 350-361
JBMR PLUSno. 12 (2023): e10841-e10841
JOURNAL OF BONE AND MINERAL RESEARCH (2023): 104-104
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AMERICAN JOURNAL OF BIOLOGICAL ANTHROPOLOGY (2023): 16-16
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The Journal of endocrinologyno. 1 (2022): 13-26
Kidney internationalno. 5 (2021): 1118-1126
Orthopaedic Proceedings (2021)
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