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

M. P. Markey, J. Bergseid, E. E. Bosco, K. Stengel, H. Xu, C. N. Mayhew, S. J. Schwemberger, W. A. Braden, Y. Jiang, G. F. Babcock, A. G. Jegga, B. J. Aronow, M. F. Reed, J. Y J Wang, E. S. Knudsen

Research output: Contribution to journalArticle

51 Citations (Scopus)

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.

Original languageEnglish (US)
Pages (from-to)6307-6318
Number of pages12
JournalOncogene
Volume26
Issue number43
DOIs
StatePublished - Sep 20 2007

Fingerprint

Retinoblastoma
Cell Cycle Checkpoints
Genes
Gene Expression
Neoplasms
Fibroblasts
Up-Regulation
Down-Regulation
E2F Transcription Factors
Mutant Proteins
Microarray Analysis
Tumor Suppressor Genes
Cell Cycle
Carcinogenesis
Cell Proliferation
Proteins

Keywords

  • Cell cycle
  • E2F
  • Inflammation
  • RB
  • Transcriptional repression

ASJC Scopus subject areas

  • Molecular Biology
  • Cancer Research
  • Genetics

Cite this

Markey, M. P., Bergseid, J., Bosco, E. E., Stengel, K., Xu, H., Mayhew, C. N., ... Knudsen, E. S. (2007). Loss of the retinoblastoma tumor suppressor: Differential action on transcriptional programs related to cell cycle control and immune function. Oncogene, 26(43), 6307-6318. https://doi.org/10.1038/sj.onc.1210450

Loss of the retinoblastoma tumor suppressor : Differential action on transcriptional programs related to cell cycle control and immune function. / Markey, M. P.; Bergseid, J.; Bosco, E. E.; Stengel, K.; Xu, H.; Mayhew, C. N.; Schwemberger, S. J.; Braden, W. A.; Jiang, Y.; Babcock, G. F.; Jegga, A. G.; Aronow, B. J.; Reed, M. F.; Wang, J. Y J; Knudsen, E. S.

In: Oncogene, Vol. 26, No. 43, 20.09.2007, p. 6307-6318.

Research output: Contribution to journalArticle

Markey, MP, Bergseid, J, Bosco, EE, Stengel, K, Xu, H, Mayhew, CN, Schwemberger, SJ, Braden, WA, Jiang, Y, Babcock, GF, Jegga, AG, Aronow, BJ, Reed, MF, Wang, JYJ & Knudsen, ES 2007, 'Loss of the retinoblastoma tumor suppressor: Differential action on transcriptional programs related to cell cycle control and immune function', Oncogene, vol. 26, no. 43, pp. 6307-6318. https://doi.org/10.1038/sj.onc.1210450
Markey, M. P. ; Bergseid, J. ; Bosco, E. E. ; Stengel, K. ; Xu, H. ; Mayhew, C. N. ; Schwemberger, S. J. ; Braden, W. A. ; Jiang, Y. ; Babcock, G. F. ; Jegga, A. G. ; Aronow, B. J. ; Reed, M. F. ; Wang, J. Y J ; Knudsen, E. S. / Loss of the retinoblastoma tumor suppressor : Differential action on transcriptional programs related to cell cycle control and immune function. In: Oncogene. 2007 ; Vol. 26, No. 43. pp. 6307-6318.
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