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p53 confers a selective advantage on transfected HeLa cells
P J Ridgway1, T K Hale, A W Braithwaite
1Division of Cell Biology, John Curtin School of Medical Research, Australian National University, Canberra.
Oncogene
|April 1, 1993
Summary
The tumor suppressor p53 protein, when introduced into HeLa cells, increased resistance to an antibiotic. This suggests p53 influences cell survival and G418 resistance, even if its expression is lost.
Area of Science:
- Molecular Biology
- Cancer Research
- Cell Biology
Background:
- The p53 gene is frequently mutated in human cancers.
- p53 is a phosphoprotein involved in cell proliferation regulation.
- HeLa carcinoma cells lack endogenous p53 expression.
Purpose of the Study:
- To investigate the biological effects of wild-type and mutant p53 expression in HeLa cells.
- To determine p53's role in cell proliferation and survival.
- To explore p53's influence on antibiotic resistance.
Main Methods:
- Co-transfection of HeLa cells with p53 expression plasmids and a G418 resistance marker.
- Selection of G418-resistant colonies.
- Analysis of p53 expression and cell growth/survival.
Main Results:
- Both wild-type and mutant p53 significantly increased the number of G418-resistant colonies (5- to 36-fold).
- p53 enhanced cell survival, leading to more colonies, but did not increase cell growth rate.
- G418-resistant colonies often lost p53 expression, potentially due to p53's effect on the promoter driving the selection marker.
Conclusions:
- p53 expression, even transiently, can enhance cell survival and confer resistance to G418 selection in HeLa cells.
- The observed increase in G418 resistance may be linked to a transient growth inhibition effect of p53.
- Loss of p53 expression in resistant colonies suggests regulatory feedback mechanisms.