title: Regulation of fibroblast growth factor-23 signaling by klotho.
abstract: The aging suppressor gene Klotho encodes a single-pass transmembrane protein. Klotho-deficient mice exhibit a variety of aging-like phenotypes, many of which are similar to those observed in fibroblast growth factor-23 (FGF23)-deficient mice. To test the possibility that Klotho and FGF23 may function in a common signal transduction pathway(s), we investigated whether Klotho is involved in FGF signaling. Here we show that Klotho protein directly binds to multiple FGF receptors (FGFRs). The Klotho-FGFR complex binds to FGF23 with higher affinity than FGFR or Klotho alone. In addition, Klotho significantly enhanced the ability of FGF23 to induce phosphorylation of FGF receptor substrate and ERK in various types of cells. Thus, Klotho functions as a cofactor essential for activation of FGF signaling by FGF23.
authors.affiliation: Department of Pathology, Pediatrics, and Internal Medicine and Applied Genomics, Genzyme Corporation, The University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kurosu
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Ogawa
authors.forename: Masayoshi
authors.initials: M
authors.lastname: Miyoshi
authors.forename: Masaya
authors.initials: M
authors.lastname: Yamamoto
authors.forename: Animesh
authors.initials: A
authors.lastname: Nandi
authors.forename: Kevin P
authors.initials: KP
authors.lastname: Rosenblatt
authors.forename: Michel G
authors.initials: MG
authors.lastname: Baum
authors.forename: Susan
authors.initials: S
authors.lastname: Schiavi
authors.forename: Ming-Chang
authors.initials: MC
authors.lastname: Hu
authors.forename: Orson W
authors.initials: OW
authors.lastname: Moe
authors.forename: Makoto
authors.initials: M
authors.lastname: Kuro-o
mesh_terms: D000818:Animals; D002460:Cell Line; D000089703:Fibroblast Growth Factor-23; D005346:Fibroblast Growth Factors / Q000172:deficiency / Q000235:genetics / Q000378:metabolism*; D005966:Glucuronidase / Q000235:genetics / Q000502:physiology*; D006367:HeLa Cells; D006801:Humans; D000090265:Klotho Proteins; D051379:Mice; D018345:Mice, Knockout; D016716:PC12 Cells; D051381:Rats; D017468:Receptors, Fibroblast Growth Factor / Q000378:metabolism; D015398:Signal Transduction / Q000235:genetics / Q000502:physiology*
chemical_list: C000717427:FGF23 protein, human; C000717428:Fgf23 protein, mouse; D017468:Receptors, Fibroblast Growth Factor; D005346:Fibroblast Growth Factors; D000089703:Fibroblast Growth Factor-23; D005966:Glucuronidase; D000090265:Klotho Proteins