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The Journal of Immunology, 2002, 168: 5954-5958.
Copyright © 2002 by The American Association of Immunologists

Characterization of CD4+ CTLs Ex Vivo1

Victor Appay2,3,*, John J. Zaunders3,{dagger}, Laura Papagno*, Julian Sutton*, Angel Jaramillo{ddagger}, Anele Waters§, Philippa Easterbrook§, Pat Grey, Don Smith, Andrew J. McMichael*, David A. Cooper{dagger}, Sarah L. Rowland-Jones* and Anthony D. Kelleher

* Medical Research Council Human Immunology Unit, Institute of Molecular Medicine, John Radcliffe Hospital, Oxford, United Kingdom; {dagger} Center for Immunology, St. Vincent’s Hospital, Sydney, Australia; {ddagger} Sydney Children’s Hospital, Sydney, Australia; § Department of HIV/GUM, Guy’s, Kings’, and St. Thomas’ School of Medicine, Weston Education Center, London, United Kingdom; and National Center in HIV Epidemiology and Clinical Research, University of New South Wales, Sydney, Australia

The cytotoxic potential of CD8+ T cells and NK cells plays a crucial role in the immune response to pathogens. Although in vitro studies have reported that CD4+ T cells are also able to mediate perforin-mediated killing, the in vivo existence and relevance of cytotoxic CD4+ T cells have been the subject of debate. Here we show that a population of CD4+ perforin+ T cells is present in the circulation at low numbers in healthy donors and is markedly expanded in donors with chronic viral infections, in particular HIV infection, at all stages of the disease, including early primary infection. Ex vivo analysis shows that these cells have cytotoxic potential mediated through the release of perforin. In comparison with more classical CD4+ T cells, this subset displays a distinct surface phenotype and functional profile most consistent with end-stage differentiated T cells and include Ag experienced CD4+ T cells. The existence of CD4+ cytotoxic T cells in vivo at relatively high levels in chronic viral infection suggests a role in the immune response.




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F. Yanai, E. Ishii, K. Kojima, A. Hasegawa, T. Azuma, S. Hirose, N. Suga, A. Mitsudome, M. Zaitsu, Y. Ishida, et al.
Essential Roles of Perforin in Antigen-Specific Cytotoxicity Mediated by Human CD4+ T Lymphocytes: Analysis Using the Combination of Hereditary Perforin-Deficient Effector Cells and Fas-Deficient Target Cells
J. Immunol., February 15, 2003; 170(4): 2205 - 2213.
[Abstract] [Full Text] [PDF]


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G. Consogno, S. Manici, V. Facchinetti, A. Bachi, J. Hammer, B. M. Conti-Fine, C. Rugarli, C. Traversari, and M. P. Protti
Identification of immunodominant regions among promiscuous HLA-DR-restricted CD4+ T-cell epitopes on the tumor antigen MAGE-3
Blood, February 1, 2003; 101(3): 1038 - 1044.
[Abstract] [Full Text] [PDF]




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