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Mammalian DNA damage-inducible genes associated with growth arrest and apoptosis
1Laboratory of Molecular Pharmacology, National Cancer Institute, Bethesda, MD 20892, USA. smithml@box-s.nih.gov
Abstract:
Mammalian cells are exposed to a wide variety of genotoxic stresses from both endogenous and exogenous sources. Cells typically exhibit cell cycle delays, or checkpoints, in response to acute genotoxic stress. Other types of cellular responses to DNA damage include apoptosis and probably increases in DNA repair levels. These response pathways are altered in cancer cells, by genetic alterations such as overexpression or mutation of oncogenes, or loss of tumor suppressor gene functions. As cancer chemotherapy relies primarily on the selective killing of cancer cells by DNA-damaging agents, genetic alterations affecting cellular stress response pathways may affect the outcome of cancer treatment.
Insights
Mammalian cells have stress responses like cell cycle delays to DNA damage. Cancer cells alter these pathways, impacting chemotherapy effectiveness.
Area of Science:
- Cellular biology
- Genotoxic stress response
Background:
- Mammalian cells face diverse genotoxic stresses from internal and external origins.
- Cellular responses to DNA damage include cell cycle checkpoints, apoptosis, and DNA repair.
- Cancer cells exhibit altered stress response pathways due to genetic mutations.
Purpose of the Study:
- To explore the impact of altered cellular stress responses in cancer on treatment outcomes.
Main Methods:
- Review of existing literature on genotoxic stress, cellular responses, and cancer genetics.
- Analysis of how genetic alterations in cancer affect DNA damage response pathways.
Main Results:
- Cancer cells frequently possess genetic alterations (oncogene overexpression, tumor suppressor loss) that modify stress responses.
- These modifications can influence the efficacy of DNA-damaging chemotherapy agents.
Conclusions:
- Understanding cancer cell stress response alterations is crucial for predicting and improving chemotherapy outcomes.
- Targeting or accounting for these altered pathways may enhance cancer treatment strategies.