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Neutrophils efficiently cross-prime naive T cells in vivo

Abstract : Neutrophils are professional phagocytes that migrate early, in high number, to the infection sites. Our study has analyzed how neutrophils cross-present antigens and influence CD8+ T-cell responses. By using highly purified neutrophils from peritoneal exudates and bone marrow, we have shown that neutrophils cross-present ovalbumin to a CD8+ T-cell hybridoma and to naive CD8+ T cells from OT1 transgenic mice. Cross-presentation by neutrophils was TAP and proteasome dependent and was as efficient as in macrophages. Moreover, it actually occurred earlier than in professional antigen-presenting cells. Peritoneal exudate neutrophils from mice injected intraperitoneally with ovalbumin also cross-presented ovalbumin, proving that neutrophils take up and present exogenous antigens into major histocompatibility complex I (MHC I) molecules in vivo. We then evaluated the in vivo influence of antigen cross-presentation by neutrophils on CD8+ T-cell response using beta2-microglobulin-deficient mice transferred with OT1 CD8+ T cells and injected with ovalbumin-pulsed neutrophils. Four days after neutrophil injection, OT1 cells proliferated and expressed effector functions (IFN-gamma production and cytolysis). They also responded efficiently to a rechallenge with ovalbumin-pulsed dendritic cells in CFA. These data are the first demonstration that neutrophils cross-prime CD8+ T cells in vivo and suggest that they may constitute, together with professional antigen-presenting cells, an attractive target to induce cytotoxic T cells in vaccines. Similar articles
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Contributor : Céline Beauvillain Connect in order to contact the contributor
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Celine Beauvillain, yves Delneste, Mari Scotet, Audrey Peres, Hugues Gascan, et al.. Neutrophils efficiently cross-prime naive T cells in vivo. Blood, American Society of Hematology, 2007, 110 (8), pp.2965 - 2973. ⟨10.1182/blood-2006-12-063826⟩. ⟨inserm-03436185⟩



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