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- W2100063070 abstract "Calcific tendonitis is a common clinical condition associated with high rates of tendon rupture, prolonged symptoms, and poor response to therapy. Little is known about the pathogenesis of calcifications in tendons and consequently few effective therapies are available. We hypothesized that tendon calcification, like pathologic calcification in other sites, was generated by extracellular organelles known as matrix vesicles and that isolated matrix vesicles would constitute the basis for a useful model of this process. Tendon matrix vesicles were isolated from adult porcine patellar tendons using enzymatic digestion and differential centrifugation. Vesicle morphology was examined with electron microscopy. Levels of calcium, phosphate, pyrophosphate, ATP, and mineralization-associated enzymes were measured and compared with articular cartilage vesicles from porcine articular cartilage. Vesicles were embedded in agarose gels with or without type I collagen or dermatan sulfate and incubated in calcifying salt solution trace labeled with (45)calcium. (45)Calcium in the vesicle fraction was measured after 5-7 days. The type of mineral formed was determined by micro-x-ray diffraction. Matrix vesicles isolated from adult porcine tendon were similar morphologically to those obtained from articular cartilage. They contained mineralization-related enzymes and formed hydroxyapatite mineral in vitro. Mineralization was suppressed by levamisole and modulated by extracellular matrix components. Matrix vesicles isolated from tendons mineralize in vitro. This model may aid in the study of the pathogenesis of calcific tendonitis as well as serve as a means to identify effective therapies for this common disorder." @default.
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- W2100063070 date "2007-01-01" @default.
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- W2100063070 title "Calcific Tendonitis : A Model" @default.
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- W2100063070 doi "https://doi.org/10.1080/03008200701692362" @default.
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