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CD8 cells play a critical role in delayed type hypersensitivity to intact Cryptococcus neoformans.

C H Mody, R Paine 3rd, C Jackson, G H Chen and G B Toews
J Immunol April 15, 1994, 152 (8) 3970-3979;
C H Mody
Department of Internal Medicine, University of Calgary, Alberta, Canada.
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R Paine 3rd
Department of Internal Medicine, University of Calgary, Alberta, Canada.
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C Jackson
Department of Internal Medicine, University of Calgary, Alberta, Canada.
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G H Chen
Department of Internal Medicine, University of Calgary, Alberta, Canada.
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G B Toews
Department of Internal Medicine, University of Calgary, Alberta, Canada.
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Abstract

Although cell-mediated immunity is critical for optimal host defense to C. neoformans, the role of T lymphocyte subsets is complex and poorly understood. CD8 cells are important both for optimal host defense against C. neoformans, and for expression of delayed type hypersensitivity (DTH). Because host defense correlates with the ability to mount a DTH response to C. neoformans, the current studies were performed to determine the mechanism by which CD8 cells participate in DTH. Mice were immunized by the intratracheal route with live C. neoformans, or by the subcutaneous route with heat-killed C. neoformans. Mice were depleted of CD8 cells in vivo by administration of mAb. After challenge with soluble cryptococcal Ag, the DTH response was quantified as footpad swelling. We found that mice depleted of CD8 cells before immunization were unable to express DTH. Mice depleted of CD8 cells after immunization but before challenge also were unable to express DTH. Splenocytes of mice depleted of CD8 cells in vivo, before immunization, failed to transfer DTH to naive, undepleted mice. Immune splenocytes depleted of CD8 cells in vitro also failed to transfer DTH to naive, undepleted mice. These data indicate that CD8 cells were necessary during the challenge and immunizing phases of DTH, and were necessary for expression of DTH. However, CD8 cell depletion did not abrogate DTH in mice immunized with either soluble cryptococcal Ag in complete Freund's adjuvant, or sheep red blood cells, which are mediated by CD4 cells. These data suggest that CD8 cells play a critical role in the cell-mediated immune response to C. neoformans. Based on this information, it may be possible to protect hosts with deficiencies of CD4 cells, such as in AIDS, by designing immunizing strategies for stimulating CD8 cells.

  • Copyright © 1994 by American Association of Immunologists

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The Journal of Immunology
Vol. 152, Issue 8
15 Apr 1994
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CD8 cells play a critical role in delayed type hypersensitivity to intact Cryptococcus neoformans.
C H Mody, R Paine, C Jackson, G H Chen, G B Toews
The Journal of Immunology April 15, 1994, 152 (8) 3970-3979;

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CD8 cells play a critical role in delayed type hypersensitivity to intact Cryptococcus neoformans.
C H Mody, R Paine, C Jackson, G H Chen, G B Toews
The Journal of Immunology April 15, 1994, 152 (8) 3970-3979;
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Print ISSN 0022-1767        Online ISSN 1550-6606