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J. Exp. Med.,
Volume 189, Number 2, January 18, 1999 423-434
By
From the Trudeau Institute, Saranac Lake, New York 12983
The requirements for CD8 T cells to provide protection against a localized virus infection in
models of adoptive immunotherapy are not well defined. Here we investigated the protective
value of defined in vitro-generated hemagglutinin (HA) peptide-specific primary CD8 T cell
effectors from the clone 4 T cell receptor transgenic mice, secreting type 1 or type 2 cytokines,
against pulmonary infection with whole influenza virus. Cytotoxic T lymphocytes producing
type 1 and type 2 cytokine (Tc1 and Tc2) populations were equally cytolytic, but Tc1 effectors
and not Tc2 effectors reduced the pulmonary virus titer early during infection. Host recovery
mediated by Tc1 effectors was found to be independent of interferon
production. Tc2 effectors entered the lung with delayed kinetics as compared with Tc1 effectors, and after lung entry
Tc2 effector cells did not localize near the infected airway epithelium as did Tc1 effectors but
were found within clusters of inflammatory cells distant from the epithelium. We also show that the expression of several chemokine receptors was selectively regulated in the Tc1 and Tc2
subsets. Thus, the protective value of a CD8 cell population against pulmonary influenza virus
infection is strongly correlated with its ability to exert its effector potential at the site of virus infection.
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