The response of gamma delta T cells to Plasmodium falciparum is dependent on activated CD4+ T cells and the recognition of MHC class I molecules

Immunology
S M JonesJ Langhorne

Abstract

Peripheral blood gamma delta T cells from non-exposed individuals respond to antigens of the malaria parasite, Plasmodium falciparum, in vitro. This response, largely caused by T cells bearing the V gamma 9+ chain of the T-cell receptor, is stimulated by components of the parasite expressed on the schizont stage and released at schizont rupture. The response of V gamma 9+ T cells to parasite components is inhibited by antibodies to major histocompatibility complex (MHC) class I and class II. However, the inhibition by anti-MHC class II antibodies can be overcome by the addition of interleukin-2 (IL-2) to the cultures, suggesting that gamma delta T cells themselves do not recognize MHC class II molecules but require an MHC class II-dependent response taking place in the culture. In contrast, the inhibition by anti-class I antibodies cannot be reversed by addition of IL-2. Since an accompanying CD4+ T-cell response occurred in peripheral blood mononuclear cells cultured with P falciparum antigens, it was considered that these cells provide the cytokines necessary for the subsequent activation and expansion of V gamma 9+ T cells recognizing components of the parasite and MHC class I molecules. This was confirmed by reconstituting ...Continue Reading

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