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Yeast As a Chassis for Developing Functional Assays to Study Human P53
14:57

Yeast As a Chassis for Developing Functional Assays to Study Human P53

Published on: August 4, 2019

p14ARF inhibits the growth of p53 deficient cells in a cell-specific manner

Yanxia Li1, Lizhi He, Anthony Bruce

  • 1Department of Medicine, Division of Nephrology, McMaster University, Hamilton, ON, Canada.

Biochimica Et Biophysica Acta
|June 13, 2006
PubMed

Insights

The tumor suppressor p14ARF inhibits cell growth independently of p53 in a cell-type-specific manner. This p14ARF function involves apoptosis induction, not cell cycle arrest, and is independent of Mdm2 and E2F1.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • p14ARF is a known tumor suppressor that functions in a p53-dependent pathway.
  • The mechanisms by which p14ARF inhibits tumorigenesis independently of p53 are not fully understood.
  • Previous studies suggest various factors contribute to p53-independent tumor suppression by p14ARF.

Purpose of the Study:

  • To investigate the p53-independent mechanisms of p14ARF in suppressing tumorigenesis.
  • To determine the role of cell type and specific molecular pathways (Mdm2, E2F1) in p14ARF's p53-independent functions.
  • To elucidate how p14ARF affects anchorage-dependent and -independent cell growth in p53-null cells.

Main Methods:

  • Utilized various p53-null cell lines, including 293T, HCT116, H1299, and primary mouse embryonic fibroblasts (MEFs).
  • Assessed the effects of p14ARF expression on anchorage-dependent proliferation and anchorage-independent growth (soft agar assays).
  • Investigated p14ARF's impact on E2F1 protein levels, E2F1 activity (using reporter promoters), cell cycle progression (G1 arrest), and apoptosis (Bax up-regulation).

Main Results:

  • p14ARF inhibited both anchorage-dependent and -independent proliferation in 293T and HCT116 (p53-null) cells, but not in H1299 (p53-null) lung carcinoma cells.
  • p14ARF did not affect anchorage-dependent proliferation in p53-null MEFs, but inhibited anchorage-independent growth of Ras12V-transformed p53-null MEFs.
  • Ectopic p14ARF expression did not alter E2F1 protein levels or activity, did not induce G1 arrest, but did induce apoptosis through Bax up-regulation.

Conclusions:

  • The anti-tumorigenic effects of p14ARF in p53-null cells are dependent on the cell type.
  • p14ARF's p53-independent tumor suppression involves apoptosis induction via Bax, not cell cycle arrest.
  • These mechanisms operate independently of Mdm2 and E2F1, suggesting the involvement of other cellular factors.

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