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Distribution of organic matrix in calcium oxalate renal calculi

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Summary

The quantity of protein and carbohydrate comprising the matrix of calcium oxalate monohydrate (COM) renal stones was found to decrease with distance from the surface of the stone. The average organic concentration of stones 3 to 30 mm in diameter ranged from 5.7% at the surface to 2.7% at the core. This concentration gradient suggests matrix involvement in a “growth front” on stone surfaces with migration of organic material from the “older” interior. The matrix distribution was not readily correlated with density variations or with the presence of hydroxyapatite or calcium oxalate dihydrate. Surface matrix concentrations were greater than amounts predicted by physical adsorption. Electron microscopy confirmed the presence of the organic-rich surface layer and also suggested that increase in stone size occurs predominantly by crystal growth with microcrystal aggregates as growth centers.

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Warpehoski, M.A., Buscemi, P.J., Osborn, D.C. et al. Distribution of organic matrix in calcium oxalate renal calculi. Calcif Tissue Int 33, 211–222 (1981). https://doi.org/10.1007/BF02409440

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