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CTL specific for HIV have been described in lungs of infected patients at early stages of HIV disease. In order to characterize the evolution over time of HIV-specific CTL, we have analyzed the cytotoxic function and the cell surface phenotype of the alveolar lymphocytes from 41 patients at various stages of HIV disease. We demonstrated a progressive decline of alveolar anti-HIV CTL activity and detected Ts cells from the lungs of patients with advanced HIV disease. These alveolar T cells strongly suppressed the effector phase of anti-HIV CTL lysis. They lacked a marked specificity of function because they also block anti-HLA CTL response and were not restricted by the HLA-class-I transplantation Ag. They displayed the CD3, CD8, and HNK1 markers, were CD4 and CD16 negative, and lacked NK activity. The presence of Ts cells at late stages of HIV disease could thus partly explain the inefficiency of host defenses against HIV.
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