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editorial
. 2008 Nov 7;24(1):4–7. doi: 10.1093/ndt/gfn620

Fig. 1.

Fig. 1

Simplified schematic outline of how FGF23 may exert physiological and pathological responses. Under physiological conditions, FGF23-mediated systemic regulation of phosphate homeostasis is a Klotho-dependent process. Under pathological conditions, however, an excessive amount of FGF23 may bind its receptors with low affinity without Klotho to exert non-specific effects that might influence organ functions.