Carcinogenesis Advance Access originally published online on August 14, 2003
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Carcinogenesis, Vol. 24, No. 10, 1571-1580,
October 2003
© 2003 Oxford University Press
REVIEW |
ATM, ATR and DNA-PK: initiators of the cellular genotoxic stress responses
1 Department of Pathology and Pathophysiology and 2 Department of Public Health, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310031, China, 3 Department of Psychology, Wellesley College, Wellesley, MA 02481, USA and 4 Center for Molecular Biology and Gene Therapy, Loma Linda University School of Medicine, Loma Linda, CA 92354, USA
Exposure to genotoxic agents is a major cause of human cancer, and cellular responses to genotoxic stress are important defense mechanisms. These responses are very complex, involving many cellular factors that form an extensive signal transduction network. This network includes a protein kinase cascade that connects the detection of DNA damage to the activation of transcription factors, which in turn regulate the expression of genes involved in DNA repair, cell cycle arrest and programmed cell death (apoptosis). The mitogen-activated protein kinases are the best-studied members of the kinase cascade with an acknowledged role in the genotoxic stress response. However, the initial activation of the protein kinase cascade is not fully understood, although several protein kinases, such as ataxia telangiectasia, mutated (ATM), ATM- and Rad3-related (ATR), and DNA-dependent protein kinase (DNA-PK) in humans, are increasingly recognized for their potential roles in the sensing of DNA damage and initiating the subsequent protein kinase cascade. In this review, the properties of these three kinases are discussed and their functions in the initiation of the genotoxic stress response are explored.
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