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PMID: 15024084 Published · ppublish English Journal Article Research Support, U.S. Gov't, P.H.S.

Apoptosis associated with deregulated E2F activity is dependent on E2F1 and Atm/Nbs1/Chk2.

Molecular and cellular biology ·Vol. 24 ·No. 7 ·2004-04-00 ·Pages 2968-77

Rogoff HA, Pickering MT, Frame FM, Debatis ME, Sanchez Y, Jones S, Kowalik TF

Abstract

The retinoblastoma protein (Rb)/E2F pathway links cellular proliferation control to apoptosis and is critical for normal development and cancer prevention. Here we define a transcription-mediated pathway in which deregulation of E2F1 by ectopic E2F expression or Rb inactivation by E7 of human papillomavirus type 16 signals apoptosis by inducing the expression of Chk2, a component of the DNA damage response. E2F1- and E7-mediated apoptosis are compromised in cells from patients with the related disorders ataxia telangiectasia and Nijmegen breakage syndrome lacking functional Atm and Nbs1 gene products, respectively. Both Atm and Nbs1 contribute to Chk2 activation and p53 phosphorylation following deregulation of normal Rb growth control. E2F2, a related E2F family member that does not induce apoptosis, also activates Atm, resulting in phosphorylation of p53. However, we found that the key commitment step in apoptosis induction is the ability of E2F1, and not E2F2, to upregulate Chk2 expression. Our results suggest that E2F1 plays a central role in signaling disturbances in the Rb growth control pathway and, by upregulation of Chk2, may sensitize cells to undergo apoptosis.

MeSH Terms
Animals Apoptosis/physiology Ataxia Telangiectasia Mutated Proteins Cell Cycle Proteins/metabolism Cells, Cultured Checkpoint Kinase 2 DNA-Binding Proteins E2F Transcription Factors E2F1 Transcription Factor E2F2 Transcription Factor Fibroblasts/cytology,physiology Gene Expression Regulation Humans Mice Mice, Transgenic Nuclear Proteins/metabolism Oncogene Proteins, Viral/metabolism Papillomavirus E7 Proteins Protein Serine-Threonine Kinases/metabolism Retinoblastoma Protein/metabolism Signal Transduction/physiology Transcription Factors/metabolism Tumor Suppressor Protein p53/metabolism Tumor Suppressor Proteins
Chemicals
Cell Cycle Proteins DNA-Binding Proteins E2F Transcription Factors E2F1 Transcription Factor E2F1 protein, human E2F2 Transcription Factor E2F2 protein, human E2f1 protein, mouse NBN protein, human Nuclear Proteins Oncogene Proteins, Viral Papillomavirus E7 Proteins Retinoblastoma Protein Transcription Factors Tumor Suppressor Protein p53 Tumor Suppressor Proteins oncogene protein E7, Human papillomavirus type 16 Checkpoint Kinase 2 ATM protein, human Ataxia Telangiectasia Mutated Proteins Atm protein, mouse CHEK2 protein, human Chek2 protein, mouse Protein Serine-Threonine Kinases
Authors & Affiliations
7 authors, click to expand affiliations / ORCID
Rogoff Harry A
Program in Immunology and Virology, University of Massachusetts Medical School, Worcester, Massachusetts 01655, USA.
Pickering Mary T
Frame Fiona M
Debatis Michelle E
Sanchez Yolanda
Jones Stephen
Kowalik Timothy F
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Article Info
Journal
Molecular and cellular biology
Abbr.
Mol Cell Biol
ISSN
0270-7306
Published
2004-04-00
Pages
2968-77
Language
English
Region
United States
NLM ID
8109087
PMCID
PMC371110
Subset
IM
Grants
NCI NIH HHS · CA86038 · United States
NCI NIH HHS · R01 CA077735 · United States
NIAID NIH HHS · 5T32 AI07349 · United States
NCI NIH HHS · CA77735 · United States
NCI NIH HHS · R01 CA086038 · United States
NIAID NIH HHS · T32 AI007349 · United States
NCI NIH HHS · R56 CA077735 · United States
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