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Cytokine response gene 8 (CR8) regulates the cell cycle G1-S phase transition and promotes cellular survival

Oncogene volume 20, pages 1771–1783 (2001)Cite this article

Abstract

Cellular proliferation and survival are modulated by the expression of specific genes. Cytokine response gene 8 (CR8), which was originally cloned as an IL-2-induced gene in human T lymphocytes, encodes a basic helix–loop–helix (bHLH) transcription factor. The CR8 gene product is highly conserved among human, mouse and rat, and contains sequence motifs that distinguish it from other bHLH families. The CR8 gene is ubiquitously expressed, and CR8 gene expression is induced by both growth-promoting as well as growth-inhibitory stimuli. As bHLH proteins have been found to regulate both the G1-S phase cell cycle transition, as well as cellular survival, the effects of CR8 on these processes were investigated. Ectopic CR8 expression in asynchronous U2OS cell cultures reduces the percentage of cells in the cell cycle S phase, and also slows the entry of G1-synchronized cells into S phase. The prolonged G1 interval correlates with impaired elevation of cyclin E protein and prolonged p21 protein expression in G1. CR8 expression also protects U2OS cells from serum-withdrawal induced apoptosis. These results indicate that CR8 is an important modulator of both the G1-S phase cell cycle transition, and cellular survival.

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Acknowledgements

This work was supported by National Institutes of Health, NIAID grants □num;RO1 A1 32031-24 and 1RO1 Al44207-O1A1.

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Authors and Affiliations

  1. The Division of Immunology, Department of Medicine, The New York Presbyterian-Cornell Medical Center, 1300 York Avenue, New York, 10021, NY, USA

    Carol Beadling, Anna Cereseto, Wen Fan, Mayumi Naramura & Kendall A Smith

  2. Weill Medical College & Graduate School of Medical Sciences, The New York Presbyterian-Cornell Medical Center, 1300 York Avenue, New York, 10021, NY, USA

    Wen Fan & Kendall A Smith

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  1. Carol Beadling
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  2. Anna Cereseto
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  4. Mayumi Naramura
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Beadling, C., Cereseto, A., Fan, W. et al. Cytokine response gene 8 (CR8) regulates the cell cycle G1-S phase transition and promotes cellular survival. Oncogene 20, 1771–1783 (2001). https://doi.org/10.1038/sj.onc.1204212

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