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. 1993 Dec;13(12):7942–7952. doi: 10.1128/mcb.13.12.7942

Complementation by wild-type p53 of interleukin-6 effects on M1 cells: induction of cell cycle exit and cooperativity with c-myc suppression.

N Levy 1, E Yonish-Rouach 1, M Oren 1, A Kimchi 1
PMCID: PMC364866  PMID: 8247009

Abstract

Stable transfection of M1 myeloid leukemia cells with a temperature-sensitive mutant of p53 results in two phenomena that are manifested exclusively at the permissive temperature. On one hand, activation of wild-type p53 by the temperature shift induced an apoptotic type of cell death which could be inhibited by interleukin-6 (IL-6) (E. Yonish-Rouach, D. Resnitzky, J. Lotem, L. Sachs, A. Kimchi, and M. Oren, Nature 352:345-347, 1991). On the other hand, as reported in this work, activated p53 complemented the antiproliferative effects of IL-6 in M1 cells. A shift to the permissive temperature concomitant with or early after IL-6 treatment imposed a novel pattern of cell cycle arrest in which about 95% of the cells were retained within a G0-like quiescent state. This phase was characterized by 2N DNA content and low RNA and protein content. On the molecular level, activation of wild-type p53 transrepressed the c-myc gene but not the cyclin A, D1, or D2 gene, which are all independently suppressed by IL-6 in M1 cells. To further analyze whether c-myc inhibition mediates or complements p53 effects, the p53-transfected M1 cells were infected with a retroviral vector expressing deregulated c-myc, refractory to p53 or IL-6 action. It was found that the process of cell death was not interrupted at all in these M1 c-myc-p53 double transfectants, suggesting that the transrepression of c-myc is not a major obligatory event mediating p53-induced cell death. In addition, some of the antiproliferative effects of activated p53, manifested in the presence of IL-6, could still be transmitted in the background of constitutive c-myc. Yet the context of deregulated c-myc interfered with the final accumulation of cells within a G0-like phase, suggesting complementary interactions between the outcome of p53 activation and of c-myc suppression in the control of cell cycle arrest.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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