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. 1995 Nov;69(11):6925–6931. doi: 10.1128/jvi.69.11.6925-6931.1995

Contact of human immunodeficiency virus type 1-infected and uninfected CD4+ T lymphocytes is highly cytolytic for both cells.

M Heinkelein 1, S Sopper 1, C Jassoy 1
PMCID: PMC189610  PMID: 7474110

Abstract

Individuals infected with the human immunodeficiency virus (HIV) experience a marked loss of CD4+ T lymphocytes, leading to fatal immunodeficiency. The mechanisms causing the depletion of these cells are not yet understood. In this study, we observed that CD4+ T lymphocytes from HIV type 1 (HIV-1)-infected and uninfected individuals rapidly lysed B lymphoblasts expressing the HIV-1 envelope glycoprotein on the cell surface and Jurkat cells expressing the complete virus. Contact of uninfected CD4+ T cells with envelope glycoprotein-expressing cells also resulted in the lysis of the uninfected CD4+ T cells. Cytolysis did not require priming or in vitro stimulation of the CD4+ T cells and was not restricted by major histocompatibility complex molecules. Cytotoxicity was inhibited by soluble CD4 and anti-CD4 monoclonal antibodies that block binding of CD4 to gp120. In addition, neutralizing anti-CD4 and anti-gp120 monoclonal antibodies which block postbinding membrane fusion events and syncytium formation also inhibited cell lysis, suggesting that identical mechanisms in HIV-infected cultures underlie cell-cell fusion and the cytolysis observed. However, cytotoxicity was not always accompanied by the formation of visible syncytia. Rapid cell lysis after contact of uninfected and HIV-1-infected CD4+ T cells may explain CD4+ T-cell depletion in the absence of detectable syncytia in infected individuals. Moreover, because of its vigor, lysis of envelope-expressing targets by contact with unprimed CD4+ T lymphocytes may at first glance resemble antigen-specific immune responses and should be excluded when cytotoxic T-lymphocyte responses in infected individuals and vaccinees are evaluated.

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Selected References

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