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c-Myc exerts a protective function through ornithine decarboxylase against cellular insults
Jong Kuk Park1, Young Min Chung, Seongman Kang
1Korea University Cancer Institute, Korea University College of Medicine, Seoul, Korea.
Molecular Pharmacology
|November 19, 2002
Summary
c-Myc activation protects cells from death caused by various stressors like radiation and chemotherapy. This protective effect is mediated by ornithine decarboxylase (ODC) induction, highlighting c-Myc's role in cellular stress response.
Area of Science:
- Molecular Biology
- Cell Biology
- Oncology
Background:
- c-Myc is a key regulator of cell proliferation and apoptosis.
- Understanding c-Myc's mechanisms is crucial for cancer research.
- Cellular insults can trigger complex stress responses.
Purpose of the Study:
- To investigate the role of c-Myc in cellular response to various insults.
- To elucidate the protective mechanisms mediated by c-Myc.
- To explore the link between c-Myc, ornithine decarboxylase (ODC), and cell survival.
Main Methods:
- Induction of c-Myc expression by cellular insults (cisplatin, doxorubicin, radiation, etc.).
- Construction of a stable transfectant overexpressing ODC.
- Analysis of cell death inhibition by c-Myc and ODC.
- Investigation of nuclear factor-kappaB (NF-κB) activation by cisplatin.
Main Results:
- c-Myc expression is induced by multiple cellular insults.
- Enhanced c-Myc protects cells from death induced by these insults via ODC induction.
- Overexpression of ODC inhibits cell death caused by cisplatin, H2O2, and radiation.
- Cisplatin activates NF-κB, leading to c-Myc induction and subsequent apoptosis blocking through ODC.
Conclusions:
- c-Myc plays a significant role in cellular stress response.
- c-Myc promotes cell survival under stressful conditions through ODC induction.
- This study reveals a novel stress-response function for c-Myc.