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- W2012309087 abstract "Although several lines of evidence support the role of calcifiable vesicles in dystrophic vascular calcification, the mechanisms whereby vesicles promote aortic calcification remain incompletely understood. Previous reports indicate that ATP promotes in vitro vesicle calcification. Whether ATP-initiated calcification is simply mediated through increased Pi concentrations or by other unknown mechanisms related to ATP hydrolysis is unclear. To determine whether high Pi levels resulting from ATP hydrolysis may cause CaxP ion products to surpass the threshold for calcium phosphate precipitation, 3 mM Pi instead of 1 mM ATP was added to calcifying media. The inclusion of 1 mM ATP in calcifying media with an initial serum level of Ca2+ (1.45 mM) and Pi (2.3 mM) was much more effective in promoting calcification than the addition of 3 mM Pi. The higher effectiveness of ATP over Pi in promoting calcification was consistent throughout various incubation periods and vesicle protein ranges. To minimize the effect of CaxPi ion products on calcification, the ion product was kept within the physiological ranges throughout the incubation period by reducing initial Pi or ATP concentrations in calcifying media. At these low levels of ion products, ATP was still more effective than Pi in promoting calcification. Both ATP- and Pi-stimulated calcifications were found to increase with increasing levels of ion products whereas greater effectiveness of ATP over Pi remained unaltered. These observations indicate that ATP hydrolysis may initiate calcification through some mechanisms other than a simple provision of Pi in order to surpass the solubility products. Concanavalin A (Con A) was found to bind to vesicles and to enhance both ATP- and Pi-promoted calcification. Taken together, these observations suggest that ATP hydrolysis, CaxP ion products, and vesicle-associated carbohydrates are implicated in vesicle-mediated calcification." @default.
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- W2012309087 date "2002-06-01" @default.
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- W2012309087 title "Mechanisms of calcification by vesicles isolated from atherosclerotic rabbit aortas" @default.
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- W2012309087 doi "https://doi.org/10.1016/s0005-2736(02)00371-1" @default.
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