Virus specificity of human influenza virus-immune cytotoxic T cells
- PMID: 84032
Virus specificity of human influenza virus-immune cytotoxic T cells
Abstract
The virus specificity of human in vitro cytotoxic T cell responses to influenza virus was studied with the use of peripheral blood mononuclear leukocytes from normal adult volunteers. Previous natural exposure of these donors to a variety of type A influenza viruses was documented by HI antibody titers. Cells sensitized in vitro with A/HK or A/PR8 were cytotoxic for autologous target cells infected with A/HK, A/PR8, or A/JAP 305 type A influenza viruses, but not for B/HK-infected or uninfected cells. B/HK-sensitized effector cells lysed target cells infected with B/HK but not targets infected with type A viruses. A/HK- and A/PR8-immune effector populations were shown to recognize cross-reactive antigens on A/HK- and A/PR8-infected target cells by cold target competition. Influenza-immune effector cells were cytotoxic for virus-infected autologous targets but much less so for virus-infected allogeneic targets. This self-restriction suggested that the cytotoxicity was largely T cell-mediated and was confirmed by cell separation analysis. Thus, the human secondary cytotoxic T cell response in vitro to influenza viruses is predominantly directed against cross-reactive determinants on cells infected with serologically distinct type A influenza viruses.
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