Abstract
Osteoporosis is associated with the pathogenesis of urinary stone formation. Urinary stones are similar to bone diseases such as osteoporosis and bone metabolism in terms of pathogenesis. Bisphosphonates are potent inhibitors of bone resorption, and are used in the management of bone disease. Furthermore, bisphosphonates have a strong affinity for calcium, and a reported inhibitory effect on calcium oxalate crystallization in vitro. Thus, bisphosphonates might also inhibit urinary stone formation. Madin-Darby canine kidney (MDCK) cells form calcium phosphate microliths at the basolateral side in vitro. We investigated the inhibitory effects of new generation bisphosphonates (alendronate and incadronate) on calcium phosphate microlith formation and on the expression of osteopontin, which is an important urinary stone matrix. MDCK cells formed two types of colonies in three-dimensional soft agar culture; dark colonies containing calcium phosphate microliths and clear colonies free from microliths. We applied purified alendronate and incadronate at concentrations of 10−11, 10−9, 10−7 and 10−5 M to MDCK cells cultured in three-dimensional soft agar and investigated the efficiency of colony formation and the dark colony ratio (number of dark colonies relative to the total number of colonies). The administration of 10−9 and 10−7 M alendronate decreased the dark colony ratio compared with controls, whereas incadronate did not significantly alter this colony ratio compared with controls. The expression of osteopontin in cultured cells was inhibited by the 10−7 M alendronate administration. The present findings show that alendronate inhibits calcium stone formation, suggesting that it is effective in the prevention of urolithiasis.
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This study was supported, in part, by grants-in-aid for scientific research from the Ministry of Education, Science, Sports and Culture of Japan (no. 13770889 and no. 12307032).
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Senzaki, H., Yasui, T., Okada, A. et al. Alendronate inhibits urinary calcium microlith formation in a three-dimensional culture model. Urol Res 32, 223–228 (2004). https://doi.org/10.1007/s00240-004-0409-7
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DOI: https://doi.org/10.1007/s00240-004-0409-7