Both CD4+ and CD8+ T Cells Can Mediate Vaccine-Induced Protection againstCoccidioides immitisInfection in Mice

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Abstract

To determine which lymphocytes are required for vaccine-induced immunity to coccidioidomycosis, we used a temperature-sensitive mutant of Coccidioides immitis to immunize mice lacking subsets of lymphocytes or specific cytokines and infected the mice 4 weeks later with virulent C. immitis. After 2 weeks, we determined the number of fungi in their lungs and spleens. Vaccine-induced immunity required αβ T lymphocytes. β-2 microglobulin knockout (KO) mice were protected by immunization, and we transferred protection using CD4+ T cells from immunized mice. However, vaccination also protected CD4+ KO mice, which suggests that CD8+ T cells played a role in vaccine-induced immunity, even though they were not required. We adaptively transferred protection using spleen cells from immunized CD4+ KO mice to nonimmune B6 mice, but CD8+-depleted spleen cells did not protect against infection. Recipients of spleen cells from immunized CD4+ KO mice had 6 times more tumor necrosis factor (TNF)-α mRNA in their lungs than did mice that received nonimmune spleen cells, and TNF receptor-1 KO mice were not fully protected by immunization. These results show that both CD4+ and CD8+ T cells can protect against coccidioidomycosis and that TNF-α is a necessary component of the acquired immune response.

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