Oxidative stress and oxidative damage in carcinogenesis.
Carcinogenesis is a multistep process involving mutation and the subsequent selective clonal expansion of the mutated cell. Chemical and physical agents including those that induce reative oxygen species can induce and/or modulate this multistep process. Several modes of action by which carcinogens induce cancer have been identified, including through production of reactive oxygen species (ROS). Oxidative damage to cellular macromolecules can arise through overproduction of ROS and faulty antioxidant and/or DNA repair mechanisms. In addition, ROS can stimulate signal transduction pathways and lead to activation of key transcription factors such as Nrf2 and NF-kappaB. The resultant altered gene expression patterns evoked by ROS contribute to the carcinogenesis process. Recent evidence demonstrates an association between a number of single nucleotide polymorphisms (SNPs) in oxidative DNA repair genes and antioxidant genes with human cancer susceptibility. These aspects of ROS biology will be discussed in the context of their relationship to carcinogenesis.
Klaunig
James E
JE
Indiana University School of Medicine, Indianapolis, IN 46202, USA. jklauni@iupui.edu
Kamendulis
Lisa M
LM
Hocevar
Barbara A
BA
D000818:Animals; D004249:DNA Damage; D004260:DNA Repair; D006801:Humans; D051793:Hypoxia-Inducible Factor 1 / Q000502:physiology; D008114:Liver Neoplasms, Experimental / Q000209:etiology; D051267:NF-E2-Related Factor 2 / Q000502:physiology; D009369:Neoplasms / Q000209:etiology* / Q000235:genetics / Q000378:metabolism; D010084:Oxidation-Reduction; D018384:Oxidative Stress; D011110:Polymorphism, Genetic; D017382:Reactive Oxygen Species / Q000378:metabolism; D018808:Transcription Factor AP-1 / Q000502:physiology
D051793:Hypoxia-Inducible Factor 1; D051267:NF-E2-Related Factor 2; D017382:Reactive Oxygen Species; D018808:Transcription Factor AP-1