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Loss of the retinoblastoma tumor suppressor: differential action on transcriptional programs related to cell cycle control and immune function

Oncogene volume 26, pages 6307–6318 (2007)Cite this article

Abstract

Functional inactivation of the retinoblastoma tumor suppressor gene product (RB) is a common event in human cancers. Classically, RB functions to constrain cellular proliferation, and loss of RB is proposed to facilitate the hyperplastic proliferation associated with tumorigenesis. To understand the repertoire of regulatory processes governed by RB, two models of RB loss were utilized to perform microarray analysis. In murine embryonic fibroblasts harboring germline loss of RB, there was a striking deregulation of gene expression, wherein distinct biological pathways were altered. Specifically, genes involved in cell cycle control and classically associated with E2F-dependent gene regulation were upregulated via RB loss. In contrast, a program of gene expression associated with immune function and response to pathogens was significantly downregulated with the loss of RB. To determine the specific influence of RB loss during a defined period and without the possibility of developmental compensation as occurs in embryonic fibroblasts, a second system was employed wherein Rb was acutely knocked out in adult fibroblasts. This model confirmed the distinct regulation of cell cycle and immune modulatory genes through RB loss. Analyses of cis-elements supported the hypothesis that the majority of those genes upregulated with RB loss are regulated via the E2F family of transcription factors. In contrast, those genes whose expression was reduced with the loss of RB harbored different promoter elements. Consistent with these analyses, we found that disruption of E2F-binding function of RB was associated with the upregulation of gene expression. In contrast, cells harboring an RB mutant protein (RB-750F) that retains E2F-binding activity, but is specifically deficient in the association with LXCXE-containing proteins, failed to upregulate these same target genes. However, downregulation of genes involved in immune function was readily observed with disruption of the LXCXE-binding function of RB. Thus, these studies demonstrate that RB plays a significant role in both the positive and negative regulations of transcriptional programs and indicate that loss of RB has distinct biological effects related to both cell cycle control and immune function.

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Acknowledgements

We are grateful to Dr George Blanck, Dr Karen Knudsen and Dr Lisa Morey for critical commentary on the manuscript. We also thank Dr Julien Sage and Dr Tyler Jacks for the provision of mouse strains.

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Authors and Affiliations

  1. Department of Cell and Cancer Biology, University of Cincinnati, Cincinnati, OH, USA

    M P Markey, E E Bosco, K Stengel, C N Mayhew, W A Braden & E S Knudsen

  2. Department of Medicine, Moores Cancer Center, University of California San Diego, La Jolla, CA, USA

    J Bergseid, Y Jiang & J Y J Wang

  3. Department of Pediatrics, University of Cincinnati, Cincinnati, OH, USA

    H Xu, A G Jegga & B J Aronow

  4. Division of Biomedical Informatics, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA

    H Xu, A G Jegga & B J Aronow

  5. Department of Surgery, University of Cincinnati, Cincinnati, OH, USA

    G F Babcock & M F Reed

  6. Shriners Hospital, Cincinnati, OH, USA

    S J Schwemberger & G F Babcock

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  1. M P Markey
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  2. J Bergseid
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  3. E E Bosco
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  5. H Xu
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  6. C N Mayhew
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Correspondence to E S Knudsen.

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Supplementary Information accompanies the paper on the Oncogene website (http://www.nature.com/onc).

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Markey, M., Bergseid, J., Bosco, E. et al. Loss of the retinoblastoma tumor suppressor: differential action on transcriptional programs related to cell cycle control and immune function. Oncogene 26, 6307–6318 (2007). https://doi.org/10.1038/sj.onc.1210450

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  • DOI: https://doi.org/10.1038/sj.onc.1210450

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