The Journal of Experimental Medicine
Avanti Polar Lipids
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Published online 16 April 2001.
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© The Rockefeller University Press, 0022-1007/2001/4/981/ $5.00
The Journal of Experimental Medicine, Volume 193, Number 8, April 16, 2001 981-986


Brief Definitive Report

Protection from Respiratory Virus Infections Can Be Mediated by Antigen-specific CD4+ T Cells That Persist in the Lungs

Robert J. Hogana, Weimin Zhonga, Edward J. Usherwooda, Tres Cookenhama, Alan D. Robertsa, and David L. Woodlanda
a Trudeau Institute, Saranac Lake, New York 12983

Correspondence to: David L. Woodland, Trudeau Institute, P.O. Box 59, Saranac Lake, NY 12983. Tel:518-891-3080 Fax:518-891-5126 E-mail:dwoodland{at}trudeauinstitute.org.

Although CD4+ T cells have been shown to mediate protective cellular immunity against respiratory virus infections, the underlying mechanisms are poorly understood. For example, although phenotypically distinct populations of memory CD4+ T cells have been identified in different secondary lymphoid tissues, it is not known which subpopulations mediate protective cellular immunity. In this report, we demonstrate that virus-specific CD4+ T cells persist in the lung tissues and airways for several months after Sendai virus infection of C57BL/6 mice. A large proportion of these cells possess a highly activated phenotype (CD44hi, CD62Llo, CD43hi, and CD25hi) and express immediate effector function as indicated by the production of interferon {gamma} after a 5-h restimulation in vitro. Furthermore, intratracheal adoptive transfer of lung memory cells into ß2m-deficient mice demonstrated that lung-resident virus-specific CD4+ T cells mediated a substantial degree of protection against secondary virus infection. Taken together, these data demonstrate that activated memory CD4+ T cells persisting at mucosal sites play a critical role in mediating protective cellular immunity.

Key Words: immunologic memory, immunity, mucosal, paramyxovirus, CD4+ T lymphocytes


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