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The Kaposi's sarcoma-associated herpesvirus K-bZIP protein represses transforming growth factor β signaling through interaction with CREB-binding protein

Abstract

Kaposi's sarcoma (KS)-associated herpesvirus (KSHV) is involved in the pathogenesis of KS, primary effusion lymphoma, and multicentric Castleman's disease. K-bZIP, the protein encoded by the open reading frame K8 of KSHV, is a member of the basic region-leucine zipper family of transcription factors. We studied the mechanisms that underlie KSHV-induced oncogenesis by investigating whether K-bZIP perturbs signaling through transforming growth factor β (TGF-β), which inhibits proliferation of a wide range of cell types. K-bZIP repressed TGF-β-induced, Smad-mediated transcriptional activity and antagonized the growth-inhibitory effects of TGF-β. Since both K-bZIP and Smad are known to interact with CREB-binding protein (CBP), the effect of CBP on inhibition of Smad-mediated transcriptional activation by K-bZIP was examined. K-bZIP mutants, which lacked the CBP-binding site, could not repress TGF-β-induced or Smad3-mediated transcriptional activity. Overexpression of CBP restored K-bZIP-induced inhibition of Smad3-mediated transcriptional activity. Competitive interaction studies showed that K-bZIP inhibited the interaction of Smad3 with CBP. These results suggest that K-bZIP, through its binding to CBP, disrupts TGF-β signaling by interfering with the recruitment of CBP into transcription initiation complexes on TGF-β-responsive elements. We propose a possibility that K-bZIP may contribute to oncogenesis through its ability to promote cell survival by repressing TGF-β signaling.

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Abbreviations

KSHV:

Kaposi's sarcoma-associated herpesvirus

PEL:

primary effusion lymphoma

CBP:

CREB-binding protein

NF:

nuclear factor

TGF-β:

transforming growth factor β

TβRII:

type II TGF-β receptor

TβRI:

type I TGF-β receptor

PAI:

plasminogen activator inhibitor

ARE:

activin response element

EMSA:

electrophoretic mobility shift assay

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Acknowledgements

We acknowledge all of the members in the laboratory for discussions and help. We thank Drs S Tan and MP Pando for critical reading of the manuscript. We also thank Dr J Massague for p3TP-Lux; Dr M Whitman for FAST-1 expression plasmid; Dr JL Wrana for Flag-Smad2, Flag-Smad3, Smad4-HA, Myc-Smad2, Myc-Smad3, Myc-Smad4, TβRI-WT-HA, TβRI-T204D-HA, and ARE-Lux; and Dr K Miyazono for CBP expression plasmid. This work was supported by a Grant-in-Aid for Scientific Research (C) from the Japan Society for the Promotion of Science.

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Correspondence to Naoki Mori.

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Tomita, M., Choe, J., Tsukazaki, T. et al. The Kaposi's sarcoma-associated herpesvirus K-bZIP protein represses transforming growth factor β signaling through interaction with CREB-binding protein. Oncogene 23, 8272–8281 (2004). https://doi.org/10.1038/sj.onc.1208059

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