Fibroblast growth factor 23 (FGF23) is a hormone involved in bone and mineral metabolism. Increased FGF23 levels are associated with poor clinical outcomes in patients with kidney disease and could represent a novel biomarker and therapeutic target. In this article, Komaba and Fukagawa provide an overview of the physiological role of FGF23 and discuss the Klotho-dependent and Klotho-independent effects of FGF23 in disease.
- Hirotaka Komaba
- Masafumi Fukagawa