[Vitamin D and phosphate metabolism; relationship with aging-regulating gene].

It has been known that phosphate homeostasis is mainly regulated by parathyroid hormone and vitamin D. Fibroblast growth factor 23 (FGF23) has been identified as a novel factor that regulates vitamin D and phosphate metabolism. Genetic defect of FGF23 in mice revealed not only abnormal vitamin D and phosphate metabolism, but also premature aging-like phenotype that is quite similar to Klotho mice. Regulation of vitamin D and phosphate metabolism is closely related to aging processes as well as bone and mineral metabolism.