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P14ARF: The Absence that Makes the Difference
Danilo Cilluffo1, Viviana Barra1, Aldo Di Leonardo1,2
1Department of Biological, Chemical and Pharmaceutical Sciences and Technologies, University of Palermo, 90128 Palermo, Italy.
Abstract:
P14ARF is a tumor suppressor encoded by the CDKN2a locus that is frequently inactivated in human tumors. P14ARF protein quenches oncogene stimuli by inhibiting cell cycle progression and inducing apoptosis. P14ARF functions can be played through interactions with several proteins. However, the majority of its activities are notoriously mediated by the p53 protein. Interestingly, recent studies suggest a new role of p14ARF in the maintenance of chromosome stability. Here, we deepened this new facet of p14ARF which we believe is relevant to its tumor suppressive role in the cell. To this aim, we generated a monoclonal HCT116 cell line expressing the p14ARF cDNA cloned in the piggyback vector and then induced aneuploidy by treating HCT116 cells with the CENP-E inhibitor GSK923295. P14ARF ectopic re-expression restored the near-diploid phenotype of HCT116 cells, confirming that p14ARF counteracts aneuploid cell generation/proliferation.
Insights
The tumor suppressor p14ARF (alternative reading frame) helps maintain chromosome stability. Restoring p14ARF in cancer cells prevented the generation and proliferation of aneuploid cells, supporting its tumor-suppressive function.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- The CDKN2a locus encodes p14ARF, a tumor suppressor frequently inactivated in human cancers.
- p14ARF inhibits oncogene-induced cell cycle progression and apoptosis, primarily through p53.
- Emerging evidence suggests a role for p14ARF in maintaining chromosome stability.
Purpose of the Study:
- To investigate the role of p14ARF in chromosome stability.
- To determine if p14ARF counteracts aneuploidy, a hallmark of cancer.
Main Methods:
- Generated a monoclonal HCT116 cell line stably expressing p14ARF cDNA using a piggyback vector.
- Induced aneuploidy in HCT116 cells by treatment with the CENP-E inhibitor GSK923295.
- Assessed the effect of p14ARF re-expression on cellular ploidy.
Main Results:
- Ectopic re-expression of p14ARF in HCT116 cells significantly reduced aneuploidy.
- Cells with restored p14ARF expression exhibited a near-diploid phenotype after aneuploidy induction.
- These findings confirm p14ARF's ability to counteract the generation and proliferation of aneuploid cells.
Conclusions:
- p14ARF plays a crucial role in maintaining chromosome stability.
- The chromosome-stabilizing function of p14ARF contributes to its tumor-suppressive activity.
- Targeting p14ARF pathways could offer new therapeutic strategies for cancer treatment.
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