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STLV-1-infected Japanese macaque as a model of HTLV-1 infection

Various non-human primates are the natural hosts of simian T-cell leukemia virus type 1 (STLV-1). In the present study, we analyzed Japanese macaques naturally infected with STLV-1, and evaluated them as an animal model for HTLV-1 research. Approximately 60% of individuals in the colony are seropositive for STLV-1. Clonal proliferation of STLV-1+ cells was investigated by massively sequencing the provirus integration sites. We found that some clones proliferated distinctively in monkeys with higher proviral load. T lymphocytes expressing Tax in the peripheral blood were largely CD4+. Notably, one of the monkeys surveyed in this study developed T-cell lymphoma in the brain, indicating that STLV-1 is oncogenic in Japanese macaques. We also assessed the molecular function of STLV-1 Tax and STLV-1 bZIP factor (SBZ). STLV-1 Tax activated NFAT, AP-1, canonical Wnt and canonical NF-kappa B pathways, whereas SBZ suppressed those signaling pathways. SBZ enhanced TGF-beta signaling, but STLV-1 Tax suppressed it. These findings suggest that STLV-1 Tax and SBZ have similar functions to their counterparts of HTLV-1. In addition, we found that administration of anti-CCR4 antibody, which is currently used in Japan for the treatment of ATL patients, efficiently reduced proviral load in STLV-1-infected Japanese macaques. Our study provides the evidence that Japanese macaques naturally infected with STLV-1 correspond to HTLV-1 carriers and are a suitable animal model to investigate the pathogenesis of HTLV-1 and novel therapeutic strategies.

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Correspondence to Masao Matsuoka.

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Open Access This article is published under license to BioMed Central Ltd. This is an Open Access article is 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 credited. The Creative Commons Public Domain Dedication waiver ( ) applies to the data made available in this article, unless otherwise stated.

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Miura, M., Tanabe, J., Sugata, K. et al. STLV-1-infected Japanese macaque as a model of HTLV-1 infection. Retrovirology 11 (Suppl 1), O12 (2014).

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