The Journal of Experimental Medicine
VeriKine-HS Human IFN-Beta
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Journal of Experimental Medicine, Vol 184, 131-139, Copyright © 1996 by Rockefeller University Press


ARTICLES

A role for CD4+ NK1.1+ T lymphocytes as major histocompatibility complex class II independent helper cells in the generation of CD8+ effector function against intracellular infection

EY Denkers, T Scharton-Kersten, S Barbieri, P Caspar and A Sher
Immunobiology Section, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA.

Major histocompatibility complex (MHC) class II (A beta) knockout mice were vaccinated with ts-4, an attenuated mutant strain of Toxoplasma gondii, which in normal animals induces strong T cell immunity mediated by interferon gamma (IFN-gamma). After challenge with the lethal parasite strain RH, the knockout mice displayed decreased resistance consistent with absence of CD4+ effectors. Nevertheless, these animals generated CD8+ lymphocyte effectors capable of mediating partial protection through IFN-gamma secretion. Moreover, in vivo neutralization experiments indicated that the development of resistance in knockout mice depends on CD4+ cells as well as interleukin 2 (IL-2). The identity of the IL-2-producing protective cell population was further characterized as CD4+, NK1.1+ by in vitro depletion studies and reverse transcriptase-PCR analysis of fluorescence-activated cell sorter (FACS)-purified CD4+ NK1.1+ T lymphocytes. These results demonstrate that in the absence of conventional MHC class II-restricted CD4+ T lymphocytes, CD8 priming persists and mediates partial protective immunity to T. gondii. Moreover, the data argue that CD4+, NK1.1+ cells, previously implicated in the initiation of T helper cell 2 (Th2) responses through their production of IL-4, can also play a role as alternative IL-2-secreting helper cells in Th1-mediated host resistance to infection.
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