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Apoptotic response to growth factor deprivation involves cooperative interactions between c-Fos and p300
G A Preston1, D Srinivasan, J C Barrett
1Division of Nephrology, Department of Medicine, University of North Carolina Chapel Hill, CD#7155, Chapel Hill, NC 27599, USA. Gloria_Preston@med.unc.edu
Cell Death and Differentiation
|March 14, 2000
Summary
Researchers found that c-Fos/p300 complexes are crucial for inducing apoptosis (programmed cell death) in preneoplastic cells. This discovery offers new insights into cancer progression and potential therapeutic targets.
Area of Science:
- Molecular Biology
- Cell Biology
- Cancer Research
Background:
- Apoptosis regulation is critical in neoplastic progression.
- Preneoplastic cell lines, sup+I (stage I) and sup-II (stage II), exhibit differential apoptosis susceptibility.
- Understanding the molecular mechanisms underlying apoptosis resistance is key to cancer research.
Purpose of the Study:
- To investigate the role of c-Fos/p300 complexes in apoptosis during neoplastic progression.
- To determine if c-Fos/p300 complex formation is associated with apoptosis induction.
- To explore the potential of p300 as a mediator of transcription factor-induced apoptosis.
Main Methods:
- Utilized two preneoplastic cell lines (sup+I and sup-II) with varying apoptosis sensitivity.
- Induced apoptosis via overexpression of c-Fos and p300.
- Analyzed the formation of c-Fos/p300 complexes under different conditions.
- Investigated the impact of p300 overexpression on apoptosis in human tumor cells with wild-type (wt) and mutant p53.
Main Results:
- Apoptosis induction in sup+I cells strongly correlated with c-Fos/p300 complex formation.
- Non-apoptotic sup-II cells lacked these complexes under basal conditions.
- Overexpression of c-Fos in sup-II cells led to apoptosis and c-Fos:p300 complex detection.
- p300 overexpression induced apoptosis in sup-II and p53wt human tumor cells, but not in p53mutant cells.
- A p300 fragment containing the c-Fos binding site enhanced apoptosis, implicating the complex in the process.
Conclusions:
- The c-Fos:p300 complex plays an active role in mediating apoptosis.
- p300 may function as a general mediator for transcription factor-induced apoptosis.
- These findings provide a molecular basis for understanding apoptosis dysregulation in cancer progression.