title: Regulation of oxidative stress by ATM is required for self-renewal of haematopoietic stem cells.
abstract: The 'ataxia telangiectasia mutated' (Atm) gene maintains genomic stability by activating a key cell-cycle checkpoint in response to DNA damage, telomeric instability or oxidative stress. Mutational inactivation of the gene causes an autosomal recessive disorder, ataxia-telangiectasia, characterized by immunodeficiency, progressive cerebellar ataxia, oculocutaneous telangiectasia, defective spermatogenesis, premature ageing and a high incidence of lymphoma. Here we show that ATM has an essential function in the reconstitutive capacity of haematopoietic stem cells (HSCs) but is not as important for the proliferation or differentiation of progenitors, in a telomere-independent manner. Atm-/- mice older than 24 weeks showed progressive bone marrow failure resulting from a defect in HSC function that was associated with elevated reactive oxygen species. Treatment with anti-oxidative agents restored the reconstitutive capacity of Atm-/- HSCs, resulting in the prevention of bone marrow failure. Activation of the p16(INK4a)-retinoblastoma (Rb) gene product pathway in response to elevated reactive oxygen species led to the failure of Atm-/- HSCs. These results show that the self-renewal capacity of HSCs depends on ATM-mediated inhibition of oxidative stress.
authors.affiliation: Department of Cell Differentiation, The Sakaguchi Laboratory of Developmental Biology, Keio University School of Medicine, 35 Shinano-machi, Shinjuku-ku, Tokyo 160-8582, Japan.
authors.forename: Keisuke
authors.initials: K
authors.lastname: Ito
authors.forename: Atsushi
authors.initials: A
authors.lastname: Hirao
authors.forename: Fumio
authors.initials: F
authors.lastname: Arai
authors.forename: Sahoko
authors.initials: S
authors.lastname: Matsuoka
authors.forename: Keiyo
authors.initials: K
authors.lastname: Takubo
authors.forename: Isao
authors.initials: I
authors.lastname: Hamaguchi
authors.forename: Kana
authors.initials: K
authors.lastname: Nomiyama
authors.forename: Kentaro
authors.initials: K
authors.lastname: Hosokawa
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Sakurada
authors.forename: Naomi
authors.initials: N
authors.lastname: Nakagata
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Ikeda
authors.forename: Tak W
authors.initials: TW
authors.lastname: Mak
authors.forename: Toshio
authors.initials: T
authors.lastname: Suda
mesh_terms: D000111:Acetylcysteine / Q000494:pharmacology; D000818:Animals; D000975:Antioxidants / Q000494:pharmacology; D064007:Ataxia Telangiectasia Mutated Proteins; D018797:Cell Cycle Proteins; D002455:Cell Division / Q000187:drug effects; D019070:Cell Lineage / Q000187:drug effects; D019941:Cyclin-Dependent Kinase Inhibitor p16 / Q000378:metabolism; D004268:DNA-Binding Proteins; D017353:Gene Deletion; D006410:Hematopoiesis / Q000187:drug effects; D006412:Hematopoietic Stem Cells / Q000166:cytology* / Q000187:drug effects / Q000378:metabolism*; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D018384:Oxidative Stress / Q000187:drug effects; D017346:Protein Serine-Threonine Kinases / Q000172:deficiency / Q000235:genetics / Q000378:metabolism*; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D017382:Reactive Oxygen Species / Q000378:metabolism; D016160:Retinoblastoma Protein / Q000378:metabolism; D015398:Signal Transduction / Q000187:drug effects; D025521:Tumor Suppressor Proteins
chemical_list: D000975:Antioxidants; D018797:Cell Cycle Proteins; D019941:Cyclin-Dependent Kinase Inhibitor p16; D004268:DNA-Binding Proteins; D012333:RNA, Messenger; D017382:Reactive Oxygen Species; D016160:Retinoblastoma Protein; D025521:Tumor Suppressor Proteins; D064007:Ataxia Telangiectasia Mutated Proteins; C576325:Atm protein, mouse; D017346:Protein Serine-Threonine Kinases; D000111:Acetylcysteine