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Role of IFI 16, a member of the interferon-inducible p200-protein family, in prostate epithelial cellular senescence

Abstract

Recent studies have implicated interferon signaling in the regulation of cellular senescence. However, the role of specific interferon-inducible proteins in cellular senescence remains to be defined. Here we report that IFI 16, an interferon-inducible transcriptional modulator from the p200-protein family, contributes to cellular senescence of prostate epithelial cells. Normal human prostate epithelial cells (PrEC) in culture expressed detectable levels of IFI 16, and the levels increased more than fourfold when cells approached cellular senescence. Consistent with a role of IFI 16 in cellular senescence, human prostate cancer cell lines either did not express IFI 16 or expressed a variant form, which was primarily detected in the cytoplasm of prostate cancer cells and not in the nucleus. Moreover, overexpression of functional IFI 16 in human prostate cancer cell lines inhibited colony formation. Additionally, ectopic expression of IFI 16 in clonal prostate cancer cell lines was associated with a senescence-like phenotype, production of senescence-associated β-galactosidase (a biochemical marker for cellular senescence), and reduction of S-phase cells in culture. Importantly, upregulation of p21WAF1 and inhibition of E2F-stimulated transcription accompanied inhibition of cell growth by IFI 16 in prostate cancer cell lines. Collectively, our observations support the idea that increased levels of IFI 16 in PrECs contribute to senescence-associated irreversible cell growth arrest.

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Acknowledgements

We thank Dr Qin for technical advice and Dr M Tainsky for sharing observations before publication. We also thank Drs O Pereira-Smith, S Campbell, N Mohideen, and E Wojcik for their suggestions and advise during the course of this work. This work was supported by NIH Grants CA69031 and AG022124 (to DC), and AR47307 (to BJN).

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Correspondence to Divaker Choubey.

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Xin, H., Curry, J., Johnstone, R. et al. Role of IFI 16, a member of the interferon-inducible p200-protein family, in prostate epithelial cellular senescence. Oncogene 22, 4831–4840 (2003). https://doi.org/10.1038/sj.onc.1206754

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