title: Ataxia telangiectasia mutated down-regulates phospho-extracellular signal-regulated kinase 1/2 via activation of MKP-1 in response to radiation.
abstract: Ataxia telangiectasia mutated (ATM) kinase plays a crucial role in the cellular response to DNA damage and in radiation resistance. Although much effort has focused on the relationship between ATM and other nuclear signal transducers, little is known about interactions between ATM and mitogenic signaling pathways. In this study, we show a novel relationship between ATM kinase and extracellular signal-regulated kinase 1/2 (ERK1/2), a key mitogenic stimulator. Activation of ATM by radiation down-regulates phospho-ERK1/2 and its downstream signaling via increased expression of mitogen-activated protein kinase phosphatase MKP-1 in both cell culture and tumor models. This dephosphorylation of ERK1/2 is independent of epidermal growth factor receptor (EGFR) activity and is associated with radioresistance. These findings show a new function for ATM in the control of mitogenic pathways affecting cell signaling and emphasize the key role of ATM in coordinating the cellular response to DNA damage.
authors.affiliation: Department of Radiation Oncology, University of Michigan Medical School, Ann Arbor, Michigan 48109, USA.
authors.forename: Mukesh K
authors.initials: MK
authors.lastname: Nyati
authors.forename: Felix Y
authors.initials: FY
authors.lastname: Feng
authors.forename: Divya
authors.initials: D
authors.lastname: Maheshwari
authors.forename: Sooryanarayana
authors.initials: S
authors.lastname: Varambally
authors.forename: Steven P
authors.initials: SP
authors.lastname: Zielske
authors.forename: Aarif
authors.initials: A
authors.lastname: Ahsan
authors.forename: Patrick Y
authors.initials: PY
authors.lastname: Chun
authors.forename: Vinay A
authors.initials: VA
authors.lastname: Arora
authors.forename: Mary A
authors.initials: MA
authors.lastname: Davis
authors.forename: Mira
authors.initials: M
authors.lastname: Jung
authors.forename: Mats
authors.initials: M
authors.lastname: Ljungman
authors.forename: Christine E
authors.initials: CE
authors.lastname: Canman
authors.forename: Arul M
authors.initials: AM
authors.lastname: Chinnaiyan
authors.forename: Theodore S
authors.initials: TS
authors.lastname: Lawrence
mesh_terms: D000818:Animals; D000943:Antigens, Differentiation / Q000235:genetics*; D064007:Ataxia Telangiectasia Mutated Proteins; D002294:Carcinoma, Squamous Cell / Q000235:genetics* / Q000473:pathology / Q000532:radiotherapy; D018797:Cell Cycle Proteins / Q000235:genetics* / Q000378:metabolism* / Q000528:radiation effects*; D045744:Cell Line, Tumor; D002470:Cell Survival; D004249:DNA Damage; D004261:DNA Replication; D004268:DNA-Binding Proteins / Q000235:genetics*; D054638:Dual Specificity Phosphatase 1; D004789:Enzyme Activation; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D017874:Immediate-Early Proteins / Q000378:metabolism* / Q000528:radiation effects*; D008562:Membrane Glycoproteins / Q000235:genetics*; D051379:Mice; D008819:Mice, Nude; D019006:Neural Cell Adhesion Molecules / Q000235:genetics*; D010749:Phosphoprotein Phosphatases / Q000378:metabolism* / Q000528:radiation effects*; D016133:Polymerase Chain Reaction; D054645:Protein Phosphatase 1; D017346:Protein Serine-Threonine Kinases / Q000235:genetics*; D017027:Protein Tyrosine Phosphatases / Q000378:metabolism* / Q000528:radiation effects*; D012334:RNA, Neoplasm / Q000235:genetics / Q000302:isolation & purification; D011971:Receptors, Immunologic / Q000235:genetics*; D014183:Transplantation, Heterologous; D025521:Tumor Suppressor Proteins / Q000235:genetics*
chemical_list: D000943:Antigens, Differentiation; D018797:Cell Cycle Proteins; D004268:DNA-Binding Proteins; D017874:Immediate-Early Proteins; D008562:Membrane Glycoproteins; D019006:Neural Cell Adhesion Molecules; D012334:RNA, Neoplasm; D011971:Receptors, Immunologic; C501920:SIRPA protein, human; C423651:SIRPB2 protein, human; D025521:Tumor Suppressor Proteins; C576324:ATM protein, human; D064007:Ataxia Telangiectasia Mutated Proteins; C576325:Atm protein, mouse; D017346:Protein Serine-Threonine Kinases; D010749:Phosphoprotein Phosphatases; D054645:Protein Phosphatase 1; C517019:DUSP1 protein, human; D054638:Dual Specificity Phosphatase 1; C517020:Dusp1 protein, mouse; D017027:Protein Tyrosine Phosphatases