Rapid effector function in CD8+ memory T cells.

Journal article

The nature of the CD8+ T cells that underlie antiviral protective immunological memory in vivo is unclear. We have characterized peptide-specific CD8+ T lymphocytes directly ex vivo from peripheral blood in humans with past exposure to influenza virus, using single cell interferon gamma (IFN-gamma) release as a measure of effector function. In individuals in the memory state with respect to influenza virus infection, unrestimulated antigen-specific CD8+ T cells displayed IFN-gamma release within 6 h of antigen contact, identifying a population of memory CD8+ T cells that exhibit effector function without needing to divide and differentiate over several days. We have quantified circulating CD8+ effector T cells specific for six different MHC class I-restricted influenza virus epitopes. Enumeration of these CD8+ T cells gives frequencies of peptide-specific T cells that correlate with, but are in general severalfold higher than, CTL precursor frequencies derived from limiting dilution analysis, indicating that this novel population of memory CD8+ T cells has hitherto been undetected by standard means. The phenotype of these cells, which persist at a low frequency long after recovery from an acute viral infection, suggests that they play a role in protective immunological memory.

Authors: Lalvani, A; Brookes, R; Hambleton, S; Britton, W; Hill, A

• Publication status: Published
• Journal: Journal of experimental medicine
• Volume: 186
• Issue: 6
• Pages: 859-865
• Publication date: 1997-09-01
• DOI: 10.1084/jem.186.6.859
• EISSN: 1540-9538
• ISSN: 0022-1007
• Language: English
• Keywords: T-Lymphocytes, Cytotoxic; Adult; CD8-Positive T-Lymphocytes; Receptors, Antigen, T-Cell, alpha-beta; Influenza, Human; Humans; Phenotype; Interferon-gamma; Epitopes; HLA Antigens; Antigens, Viral; Histocompatibility Antigens Class I; Amino Acid Sequence; Immunologic Memory; Orthomyxoviridae