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Blood, Vol. 95 No. 4 (February 15), 2000: pp. 1386-1392

Abundant Tax protein expression in CD4+ T cells infected with human T-cell lymphotropic virus type I (HTLV-I) is prevented by cytotoxic T lymphocytes

Emmanuel Hanon, Sarah Hall, Graham P. Taylor, Mineki Saito, Ricardo Davis, Yuetsu Tanaka, Koichiro Usuku, Mitsuhiro Osame, Jonathan N. Weber, and Charles R. M. Bangham

From the Department of Immunology and Genito-Urinary Medicine and Communicable Diseases, Imperial College School of Medicine, St Mary's Campus, London, United Kingdom; Department of Infectious Disease and Immunology, Okinawa-Asia Research Center of Medical Science, Faculty of Medicine, University of The Ryukyus, Nishihara, Okinawa, Japan; and Department of Medical Informatics and Third Department of Internal Medicine, Faculty of Medicine, Kagoshima University, Kagoshima, Japan.

The role of the cellular immune response in human T-cell leukemia virus type I (HTLV-I) infection is not fully understood. A persistently activated cytotoxic T lymphocyte (CTL) response to HTLV-I is found in the majority of infected individuals. However, it remains unclear whether this CTL response is protective or causes tissue damage. In addition, several observations paradoxically suggest that HTLV-I is transcriptionally silent in most infected cells and, therefore, not detectable by virus-specific CTLs. With the use of a new flow cytometric procedure, we show here that a high proportion of naturally infected CD4+ peripheral blood mononuclear cells (PBMC) (between 10% and 80%) are capable of expressing Tax, the immunodominant target antigen recognized by virus-specific CTLs. Furthermore, we provide direct evidence that autologous CD8+ T cells rapidly kill CD4+ cells naturally infected with HTLV-I and expressing Tax in vitro by a perforin-dependent mechanism. Consistent with these observations, we observed a significant negative correlation between the frequency of Tax11-19-specific CD8+ T cells and the percentage of CD4+ T cells in peripheral blood of patients infected with HTLV-I. Those results are in accordance with the view that virus-specific CTLs participate in a highly efficient immune surveillance mechanism that persistently destroys Tax-expressing HTLV-I-infected CD4+ T cells in vivo.


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