Originally published as JGV in Press, 10.1099/vir.0.010199-0 on May 7, 2009
J Gen Virol 90 (2009), 1806-1811; DOI 10.1099/vir.0.010199-0
HBZ is an immunogenic protein, but not a target antigen for human T-cell leukemia virus type 1-specific cytotoxic T lymphocytes
Koichiro Suemori1,
Hiroshi Fujiwara1,
Toshiki Ochi1,
Taiji Ogawa1,
Masao Matsuoka2,
Tadashi Matsumoto3,
Jean-Michel Mesnard4 and
Masaki Yasukawa1
1 Department of Bioregulatory Medicine, Ehime University Graduate School of Medicine, Toon, Ehime, Japan
2 Laboratory for Virus Immunology, Institute for Virus Research, Kyoto University, Kyoto, Japan
3 Division of Hematology and Oncology, Jiaikai Imamura Hospital, Kagoshima, Japan
4 Université Montpellier 1, Centre d'Études d'Agents Pathogènes et Biotechnologies pour la Santé (CPBS), CNRS UM5236, Montpellier, France
Correspondence
Masaki Yasukawa
yasukawa{at}m.ehime-u.ac.jp
Recently, HBZ has been reported to play an important role in the proliferation of adult T-cell leukaemia (ATL) cells and might be a target of novel therapy for ATL. To develop a novel immunotherapy for ATL, we verified the feasibility of cellular immunotherapy targeting HBZ. We established an HBZ-specific and HLA-A*0201-restricted cytotoxic T lymphocyte (CTL) clone. Detailed study using this CTL clone clearly showed that HBZ is certainly an immunogenic protein recognizable by human CTLs; however, HBZ-specific CTLs could not lyse ATL cells. Failure of HBZ-specific CTLs to recognize human T-cell leukemia virus type 1 (HTLV-1)-infected cells might be due to a low level of HBZ protein expression in ATL cells and resistance of HTLV-1-infected cells to CTL-mediated cytotoxicity. Although HBZ plays an important role in the proliferation of HTLV-1-infected cells, it may also provide a novel mechanism that allows them to evade immune recognition.
Copyright © 2009 by the Society for General Microbiology.