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  • Meeting abstract
  • Open Access

HTLV-1 bZIP factor perturbs immune response to the pathogens in vivo by inhibiting IFN-gamma production

  • 1,
  • 1,
  • 1,
  • 2 and
  • 1Email author
Retrovirology20118 (Suppl 1) :A102

  • Published:


  • Leukemia
  • Mouse Model
  • Opportunistic Infection
  • Ectopic Expression
  • Listeria

HTLV-1 carriers and the patients with adult T-cell leukemia (ATL) frequently suffer from the opportunistic infections. Although it has been known that HTLV-1 infection evokes cell-mediated immune deficiency, its mechanism remains unknown. HTLV-1 bZIP factor (HBZ) is encoded in the minus strand of HTLV-1, which is constitutively expressed and involved in the proliferation of HTLV-1-infected cells. In this study, we investigated the role of HBZ in immunodeficiency in a mice model. HBZ transgenic (HBZ-Tg) mice were infected with HSV-2 and Listeria monocytogenes and evaluated for cellular immunity to those pathogens. The clearance of both pathogens was impaired in HBZ-Tg mice compared with the non-transgenic littermate. In the both infection, production of IFN-gamma in CD4+ T cells was significantly reduced in HBZ-Tg mice. In addition, ectopic expression of HBZ in primary human CD4+ T cells impaired IFN-gamma production in vitro. As the molecular mechanisms, we found that HBZ suppressed transcription of IFNG promoter. Our results suggest that HBZ plays a crucial role for cellular immunodeficiency in HTLV-1-infected subjects.

Authors’ Affiliations

Laboratory of Virus Control, Institute for Virus Research, Kyoto University, Kyoto, Japan
Department of Hematology, Kumamoto University School of Medicine, Japan


© Sugata et al; licensee BioMed Central Ltd. 2011

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.