title: Regulation of oxidative stress by the anti-aging hormone klotho.
abstract: klotho is an aging suppressor gene and extends life span when overexpressed in mice. Klotho protein was recently demonstrated to function as a hormone that inhibits insulin/insulin-like growth factor-1 (IGF-1) signaling. Here we show that Klotho protein increases resistance to oxidative stress at the cellular and organismal level in mammals. Klotho protein activates the FoxO forkhead transcription factors that are negatively regulated by insulin/IGF-1 signaling, thereby inducing expression of manganese superoxide dismutase. This in turn facilitates removal of reactive oxygen species and confers oxidative stress resistance. Thus, Klotho-induced inhibition of insulin/IGF-1 signaling is associated with increased resistance to oxidative stress, which potentially contributes to the anti-aging properties of klotho.
authors.affiliation: Department of Pathology, the University of Texas Southwestern Medical Center, Dallas, 75390, USA.
authors.forename: Masaya
authors.initials: M
authors.lastname: Yamamoto
authors.forename: Jeremy D
authors.initials: JD
authors.lastname: Clark
authors.forename: Johanne V
authors.initials: JV
authors.lastname: Pastor
authors.forename: Prem
authors.initials: P
authors.lastname: Gurnani
authors.forename: Animesh
authors.initials: A
authors.lastname: Nandi
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kurosu
authors.forename: Masayoshi
authors.initials: M
authors.lastname: Miyoshi
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Ogawa
authors.forename: Diego H
authors.initials: DH
authors.lastname: Castrillon
authors.forename: Kevin P
authors.initials: KP
authors.lastname: Rosenblatt
authors.forename: Makoto
authors.initials: M
authors.lastname: Kuro-o
mesh_terms: D000080242:8-Hydroxy-2'-Deoxyguanosine; D000818:Animals; D003849:Deoxyguanosine / Q000031:analogs & derivatives / Q000652:urine; D051858:Forkhead Transcription Factors / Q000378:metabolism; D017353:Gene Deletion; D005966:Glucuronidase; D006367:HeLa Cells; D006801:Humans; D007328:Insulin / Q000378:metabolism; D000090265:Klotho Proteins; D008297:Male; D008565:Membrane Proteins / Q000235:genetics* / Q000378:metabolism*; D051379:Mice; D008822:Mice, Transgenic; D018482:Muscle, Skeletal / Q000378:metabolism; D018384:Oxidative Stress; D010269:Paraquat / Q000633:toxicity; D021381:Protein Transport; D051057:Proto-Oncogene Proteins c-akt / Q000378:metabolism; D013002:Somatomedins / Q000378:metabolism; D013482:Superoxide Dismutase
chemical_list: D051858:Forkhead Transcription Factors; D007328:Insulin; D008565:Membrane Proteins; D013002:Somatomedins; D000080242:8-Hydroxy-2'-Deoxyguanosine; D013482:Superoxide Dismutase; D051057:Proto-Oncogene Proteins c-akt; D005966:Glucuronidase; D000090265:Klotho Proteins; D003849:Deoxyguanosine; D010269:Paraquat