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• W2034852691 abstract "Abstract Nitrogen‐containing bisphosphonates (N‐PCP) are bisphosphonates with an increased antiresorptive potency. Aminobisphosphonates, N‐PCPs with an amino group, can cause nonspecific gastrointestinal complaints. It is not known whether these side effects are specific for these bisphosphonates or for the whole class of N‐PCPs. In this study, we investigated the effects of two aminobisphosphonates (pamidronate and alendronate) and a structurally similar N‐PCP (olpadronate) and their three respective calcium complexes on the viability and the intracellular calcium concentration ([Ca 2+ ] i ) of cultured Caco‐2 cells a model for intestinal epithelium. These cells were also examined for apoptosis or necrosis. In the presence of calcium, pamidronate and alendronate were toxic to the cells, with pamidronate being more toxic than alendronate. Olpadronate induced toxicity only at concentrations more than ten times higher than the toxic concentrations of pamidronate. In the absence of calcium definite signs of toxicity were observed only with pamidronate at clinically relevant concentrations. The complexes of pamidronate and alendronate with calcium were considerably less soluble than the olpadronate calcium complex. There were no signs of apoptosis. [Ca 2+ ] i was transiently raised after treatment with the N‐PCPs. Doses at which responses were seen were, respectively, 0.02 mM (pamidronate), 0.3 mM (alendronate), and 2 mM (olpadronate). The peak of response was slightly greater after pamidronate treatment than after alendronate or olpadronate, respectively. In conclusion pamidronate, either as an ion or as a calcium complex, is the most toxic of the bisphosphonates tested for Caco‐2 cells. Alendronate was less toxic while olpadronate was the least toxic in presence of calcium. The solubility of the bisphosphonate complexes with calcium may account for these differences in toxicity." @default.
• W2034852691 created "2016-06-24" @default.
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• W2034852691 date "1999-05-01" @default.
• W2034852691 modified "2023-10-10" @default.
• W2034852691 title "The Effects of Nitrogen-Containing Bisphosphonates on Human Epithelial (Caco-2) Cells, an In Vitro Model for Intestinal Epithelium" @default.
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• W2034852691 doi "https://doi.org/10.1359/jbmr.1999.14.5.784" @default.
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