Abstract
Vascular calcification affects the prognosis of patients with renal failure. Bisphosphonates are regarded as candidate anti-calcifying drugs because of their inhibitory effects on both calcium-phosphate aggregation and bone resorption. However, calcification in well-known rodent models is dependent upon bone resorption accompanied by excessive bone turnover, making it difficult to estimate accurately the anti-calcifying potential of drugs. Therefore, models with low bone resorption are required to extrapolate anti-calcifying effects to humans. Three bisphosphonates (etidronate, alendronate, and FYB-931) were characterised for their inhibitory effects on bone resorption in vivo and calcium-phosphate aggregation estimated by calciprotein particle formation in vitro. Then, their effects were examined using two models inducing ectopic calcification: the site where lead acetate was subcutaneously injected into mice and the transplanted, aorta obtained from a donor rat. The inhibitory effects of bisphosphonates on bone resorption and calcium-phosphate aggregation were alendronate > FYB-931 > etidronate and FYB-931 > alendronate = etidronate, respectively. In the lead acetate-induced model, calcification was most potently suppressed by FYB-931, followed by alendronate and etidronate. In the aorta-transplanted model, only FYB-931 suppressed calcification at a high dose. In both the models, no correlation was observed between calcification and bone resorption marker, tartrate-resistant acid phosphatase (TRACP). Results from the lead acetate-induced model showed that inhibitory potency against calcium-phosphate aggregation contributed to calcification inhibition. The two calcification models, especially the lead acetate-induced model, may be ideal for the extrapolation of calcifying response to humans because of calcium-phosphate aggregation rather than bone resorption as its mechanism.
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Acknowledgements
We thank Dr. Koji Matsumoto, and Ms. Noriko Chikamatsu in FUJI YAKUHIN CO., LTD. for their assistance in the in vivo evaluation.
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Participated in research design: Shota Morikane, Koichi Ishida, Naoki Ashizawa, Naoki Kurita, Seiichi Kobashi and Takashi Iwanaga. Conducted experiments: Shota Morikane, Koichi Ishida and Naoki Ashizawa. Wrote or contributed to the writing of the manuscript: Shota Morikane, Naoki Ashizawa, Koichi Ishida, Masaya Matsubayashi, and Tetsuya Taniguchi. All authors read and approved the final manuscript.
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Shota Morikane, Koichi Ishida, Naoki Ashizawa, Tetsuya Taniguchi, Masaya Matsubayashi, Naoki Kurita, Seiichi Kobashi and, Takashi Iwanaga have no conflict of interest directly relevant to the content of this manuscript.
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Morikane, S., Ishida, K., Ashizawa, N. et al. Lead Acetate-Injected Mice is an Animal Model for Extrapolation of Calcifying Response to Humans Due to Low Involvement of Bone Resorption. Calcif Tissue Int (2024). https://doi.org/10.1007/s00223-024-01245-w
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DOI: https://doi.org/10.1007/s00223-024-01245-w