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While essential for phosphate homeostasis, elevated FGF23 increases phosphate concentration in the renal tubular fluid, promoting calcium-phosphate crystal formation and tubular injury. Here we show that bone resorption mobilizes phosphate into the circulation and mimics the pathophysiology of dietary phosphate loading. Enhanced bone resorption, induced by soluble receptor activator of NF-\u03baB ligand (sRANKL) administration or microgravity exposure on the International Space Station, increased circulating FGF23 levels and caused renal tubular injury in mice. Pre-treatment with bisphosphonate, an inducer of osteoclast apoptosis, prevented sRANKL-induced increases in FGF23 and tubular damage. 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