title: p63 deficiency activates a program of cellular senescence and leads to accelerated aging.
abstract: The p53 tumor suppressor plays a key role in organismal aging. A cellular mechanism postulated to drive the aging process is cellular senescence, mediated in part by p53. Although senescent cells accumulate in elderly individuals, most studies have relied on correlating in vitro senescence assays with in vivo phenotypes of aging. Here, using two different mouse models in which the p53-related protein p63 is compromised, we demonstrate that cellular senescence and organismal aging are intimately linked and that these processes are mediated by p63 loss. We found that p63(+/-) mice have a shortened life span and display features of accelerated aging. Both germline and somatically induced p63 deficiency activates widespread cellular senescence with enhanced expression of senescent markers SA-beta-gal, PML, and p16(INK4a). Using an inducible tissue-specific p63 conditional model, we further show that p63 deficiency induces cellular senescence and causes accelerated aging phenotypes in the adult. Our results thus suggest a causative link between cellular senescence and aging in vivo, and demonstrate that p63 deficiency accelerates this process.
authors.affiliation: Cold Spring Harbor Laboratory, Cold Spring Harbor, NY 11724, USA.
authors.forename: William M
authors.initials: WM
authors.lastname: Keyes
authors.forename: Ying
authors.initials: Y
authors.lastname: Wu
authors.forename: Hannes
authors.initials: H
authors.lastname: Vogel
authors.forename: Xuecui
authors.initials: X
authors.lastname: Guo
authors.forename: Scott W
authors.initials: SW
authors.lastname: Lowe
authors.forename: Alea A
authors.initials: AA
authors.lastname: Mills
mesh_terms: D000375:Aging / Q000235:genetics / Q000502:physiology*; D019588:Aging, Premature / Q000209:etiology / Q000235:genetics / Q000473:pathology; D000818:Animals; D001483:Base Sequence; D002478:Cells, Cultured; D016922:Cellular Senescence / Q000235:genetics / Q000502:physiology*; D018076:DNA, Complementary / Q000235:genetics; D004848:Epithelium / Q000473:pathology; D005260:Female; D015603:Keratinocytes / Q000473:pathology; D008297:Male; D051379:Mice; D008817:Mice, Mutant Strains; D008822:Mice, Transgenic; D010641:Phenotype; D010750:Phosphoproteins / Q000172:deficiency* / Q000235:genetics / Q000502:physiology; D011247:Pregnancy; D015534:Trans-Activators / Q000172:deficiency* / Q000235:genetics / Q000502:physiology; D025521:Tumor Suppressor Proteins / Q000172:deficiency / Q000235:genetics / Q000502:physiology
chemical_list: D018076:DNA, Complementary; D010750:Phosphoproteins; D015534:Trans-Activators; C486419:Trp63 protein, mouse; D025521:Tumor Suppressor Proteins