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Mediation of c-Myc-induced apoptosis by p53
1Institut für Klinische Molekularbiologie und Tumorgenetik Forschungszentrum für Umwelt und Gesundheit, GSF, München, Germany.
Abstract:
The cellular proto-oncogene c-myc is involved in cell proliferation and transformation but is also implicated in the induction of programmed cell death (apoptosis). The same characteristics have been described for the tumor suppressor gene p53, the most commonly mutated gene in human cancer. In quiescent mouse fibroblasts expressing wild-type p53 protein, activation of c-Myc was found to induce apoptosis and cell cycle reentry, preceded by stabilization of p53. In contrast, in quiescent p53-null fibroblasts, activation of c-Myc induced cell cycle reentry but not apoptosis. These results suggest that p53 mediates apoptosis as a safeguard mechanism to prevent cell proliferation induced by oncogene activation.
Insights
The tumor suppressor p53 protein mediates apoptosis, preventing uncontrolled cell growth. Activating the c-Myc oncogene in cells with p53 triggers apoptosis, but not in cells lacking p53.
Area of Science:
- Molecular Biology
- Cell Biology
- Oncology
Background:
- The proto-oncogene c-Myc drives cell proliferation and transformation.
- The tumor suppressor p53 is frequently mutated in human cancers.
- Both c-Myc and p53 are implicated in regulating apoptosis.
Purpose of the Study:
- To investigate the role of p53 in mediating c-Myc-induced apoptosis.
- To determine if p53 is required for c-Myc to induce cell cycle reentry.
Main Methods:
- Utilized quiescent mouse fibroblasts with either wild-type p53 or p53-null status.
- Activated the c-Myc oncogene in these fibroblasts.
- Monitored for apoptosis and cell cycle reentry.
Main Results:
- Activation of c-Myc induced apoptosis and cell cycle reentry in wild-type p53 fibroblasts.
- c-Myc activation led to cell cycle reentry but not apoptosis in p53-null fibroblasts.
- p53 stabilization preceded apoptosis induction by c-Myc.
Conclusions:
- p53 acts as a crucial mediator of apoptosis in response to oncogene activation.
- p53 functions as a safeguard mechanism against oncogene-induced proliferation.
- The p53 pathway is essential for suppressing uncontrolled cell growth driven by oncogenes like c-Myc.