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Blood, 15 September 2001, Vol. 98, No. 6, pp. 1667-1677

REVIEW ARTICLE

Dressed to kill? A review of why antiviral CD8 T lymphocytes fail to prevent progressive immunodeficiency in HIV-1 infection

Judy Lieberman, Premlata Shankar, N. Manjunath, and Jan Andersson

From the Center for Blood Research and Department of Pediatrics, Harvard Medical School, Boston, MA; and the Division of Infectious Diseases, Center for Infectious Medicine, Karolinska Institutet, Huddinge University Hospital, Stockholm, Sweden.

CD8 T cells play an important role in protection and control of HIV-1 by direct cytolysis of infected cells and by suppression of viral replication by secreted factors. However, although HIV-1-infected individuals have a high frequency of HIV-1-specific CD8 T cells, viral reservoirs persist and progressive immunodeficiency generally ensues in the absence of continuous potent antiviral drugs. Freshly isolated HIV-specific CD8 T cells are often unable to lyse HIV-1-infected cells. Maturation into competent cytotoxic T lymphocytes may be blocked during the initial encounter with antigen because of defects in antigen presentation by interdigitating dendritic cells or HIV-infected macrophages. The molecular basis for impaired function is multifactorial, due to incomplete T-cell signaling and activation (in part related to CD3zeta and CD28 down-modulation), reduced perforin expression, and inefficient trafficking of HIV-specific CD8 T cells to lymphoid sites of infection. CD8 T-cell dysfunction can partially be corrected in vitro with short-term exposure to interleukin 2, suggesting that impaired HIV-specific CD4 T helper function may play a significant causal or exacerbating role. Functional defects are qualitatively different and more severe with advanced disease, when interferon gamma  production also becomes compromised.


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Related Letter in Blood Online:

Why antiviral CD8 T lymphocytes fail to prevent progressive immunodeficiency in HIV-1 infection
Carlo Agostini, Gianpietro Semenzato, Judy Lieberman, Premlata Shankar, M. Swamy, and Jan Andersson
Blood 2002 99: 1876-1878. [Full Text] [PDF]



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