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Chemotherapeutically induced DNA damage, ATP depletion, and the apoptotic biochemical cascade
1Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY 10021, USA.
Abstract:
The biochemical death cascade of apoptosis is separate from, although induced by, the anticancer drug-target interaction. The failure of many of our chemotherapeutic agents reflects an inability of anticancer drugs to induce apoptosis. Understanding the basic cellular mechanisms that control apoptosis will greatly increase our ability to treat cancer. Identification of the components of the apoptotic biochemical cascade will present new targets for complementary enhancement of chemotherapeutically induced cancer cell death. One factor that has been directly implicated in apoptosis is adenosine triphosphate (ATP). Nevertheless, in this regard, ATP is controversial. This commentary takes issue with dogma, and points to the need for additional thought and research in this field. ATP-depleting therapy of tumor-bearing mice has been shown to induce a marked therapeutic result with minimal mortality, and this effect can be further enhanced when combined with chemotherapy. The definitive mechanism of action is still controversial, although several mechanisms for ATP depletion have been implicated in the process. These include reduction in the mitochondrial transmembrane potential, activation of poly (ADP-ribose) polymerase (PARP) and depletion of the coenzyme nicotinamide adenine dinucleotide (NAD+). Even though the definitive experiments have yet to be carried out, the identification of ATP depletion as a critical determinant in apoptosis should allow for the development of new therapeutic strategies in the treatment of human cancer.
Insights
Cancer drug failure stems from inability to trigger apoptosis. Targeting adenosine triphosphate (ATP) depletion shows promise for enhancing cancer cell death and improving chemotherapy effectiveness.
Area of Science:
- Biochemistry
- Molecular Biology
- Oncology
Background:
- Apoptosis, the programmed cell death cascade, is crucial for cancer treatment.
- Many chemotherapeutic agents fail because they cannot effectively induce apoptosis.
- Understanding apoptosis regulation is key to improving cancer therapies.
Purpose of the Study:
- To explore the role of adenosine triphosphate (ATP) in apoptosis.
- To challenge the conventional understanding of ATP's function in cancer cell death.
- To identify new therapeutic targets for enhancing chemotherapy.
Main Methods:
- Review of existing literature on ATP's role in apoptosis.
- Analysis of studies involving ATP-depleting therapy in tumor-bearing mice.
- Discussion of potential mechanisms of ATP depletion, including mitochondrial potential reduction, PARP activation, and NAD+ depletion.
Main Results:
- ATP depletion therapy in mice demonstrated significant therapeutic effects with low mortality.
- Combining ATP depletion with chemotherapy enhanced anti-cancer outcomes.
- Several mechanisms, including mitochondrial dysfunction and coenzyme depletion, are implicated in ATP depletion.
Conclusions:
- ATP depletion is a critical factor in inducing apoptosis and cancer cell death.
- Targeting ATP depletion offers a novel strategy for cancer treatment.
- Further research is needed to elucidate definitive mechanisms and optimize therapeutic approaches.