Abstract
Using Cre-Lox technology to inducibly delete Rb from wild-type, p21- and/or p53-deficient primary hepatocytes, we investigated the role of p53, p21 and pRb in the regulation of liver cell proliferation, polyploidization and death. These cellular decisions are critical to maintaining liver cell replacement in disease, and in determining the likelihood of carcinogenesis in chronic liver injury. Clearly, the present study shows a complex interplay between p53, p21 and pRb, which regulates the likelihood of hepatocytes stimulated from quiescence, to proliferate, undergo polyploidy or die. It reveals that these proteins act both in concert and independently, demonstrating that a small set of key cellular players is common to diverse cell decisions of fundamental importance to disease.
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Abbreviations
- s.d.:
-
standard deviation
- Rb-floxed:
-
homozygote for floxed Rb
- wt:
-
wild-type or Rb-floxed cells treated with control adenovirus, or untreated
- p21−/−:
-
knockout for p21
- p53−/−:
-
knockout for p53
- Rb−/−:
-
Rb-floxed cells infected by Cre-recombinase
- p14/p19ARF:
-
human p14ARF or mouse p19ARF
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Acknowledgements
The Rb-floxed (Rblox/lox) mice and the p21−/− mice were a kind gift from Anton Berns (Netherlands Cancer Institute, Amsterdam) and Philip Leder (Harvard Medical School, Boston, MA), to whom we are very grateful. We wish to thank Helen Caldwell for technical assistance. This work was supported by a grant from the Melville Trust for the Care and Cure of Cancer to SP.
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Sheahan, S., Bellamy, C., Treanor, L. et al. Additive effect of p53, p21 and Rb deletion in triple knockout primary hepatocytes. Oncogene 23, 1489–1497 (2004). https://doi.org/10.1038/sj.onc.1207280
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DOI: https://doi.org/10.1038/sj.onc.1207280
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