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Transcriptional repression of the E2F-1 gene by interferon-α is mediated through induction of E2F-4/pRB and E2F-4/p130 complexes

Abstract

E2F is a heterodimeric transcription factor composed of one of five E2F subunits (E2F-1 to E2F-5) and a DP subunit. E2F regulates the expression of several growth-promoting genes, and thus, can be a target of antiproliferative action of interferons (IFNs). In this study, we investigated the mechanisms whereby IFN-α suppresses transcription of the E2F-1 gene. Transfection studies revealed that E2F-1 promoter was functionally divided into two parts: upstream activation sequences (UAS) and a downstream negative-regulatory element (E2F-binding sites). When cells were proliferating, transcription of the E2F-1 gene was primarily driven by the UAS, while E2F sites were not involved in activation. IFN-α markedly reduced E2F-1 promoter activity, but introduction of non-binding mutation at the E2F sites completely abrogated the inhibition. Free E2F-4 was found to be the predominant species bound to the E2F sites in proliferating cells. IFN-α induced up-regulation of E2F-4 along with dephosphorylation of pRB and p130, which resulted in the formation of E2F-4/pRB and E2F-4/p130 complexes on the E2F-1 promoter. These complexes function as transcriptional repressors to inhibit E2F-1 mRNA expression. Our findings indicate that E2F-4 is a critical regulator of E2F-1, which offer an excellent paradigm for understanding functional diversity within the E2F family.

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Acknowledgements

We are grateful to Ms Yukiko Fukuda and Ms Taeko Inegeda for their technical assistance. This work was supported in part by Grants-in-Aid from the Ministry of Education Science and Culture of Japan (P07269220, C09680701) and by a grant from the Ichiro Kanehara Foundation (to YF).

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Furukawa, Y., Iwase, S., Kikuchi, J. et al. Transcriptional repression of the E2F-1 gene by interferon-α is mediated through induction of E2F-4/pRB and E2F-4/p130 complexes. Oncogene 18, 2003–2014 (1999). https://doi.org/10.1038/sj.onc.1202500

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