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Whole lymphoma B cells allow efficient cross-presentation of antigens by dendritic cells.

Abstract : BACKGROUND: In order to compensate for the paucity of defined tumor antigens (Ag) in non-Hodgkin's lymphomas, a promising approach might be the use of whole tumor cells as a source of tumor Ag to pulse antigen-presenting cells (APC). However, it is not presently known how the tumor cells should be delivered to APC to optimize the cross-presentation of tumor Ag to anti-tumor CD8 T cells. We aimed to compare CD20-opsonized, apoptotic and necrotic human tumor cells for their capacity to induce endocytosis and cross-presentation of tumor-associated Ag by dendritic cells (DC) or macrophages. METHODS: Endocytosis of human tumor-derived material by macrophages or DC was monitored by flow cytometry. We used a previously described influenza model and studied cross-presentation of viral Ag as cellular surrogate tumor-associated Ag by APC after endocytosis of lymphoma B cells treated by inactivated influenza virus. RESULTS: Optimal endocytosis was obtained when tumor cells were opsonized by an anti-CD20 antibody and, as expected, macrophages were more phagocytic than DC. However, Ag from opsonized, apoptotic and live cells, but not from necrotic lymphoma cells, were efficiently cross-presented by DC but not by macrophages. DISCUSSION: We have developed a new model with human primary lymphoma cells to study the cross-presentation of tumor-associated Ag by APC. The results we have obtained support the use of whole lymphoma cells from patients to pulse DC to induce an anti-tumor immune response.
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Contributor : Laurence Chaperot <>
Submitted on : Tuesday, January 20, 2009 - 7:00:01 AM
Last modification on : Friday, November 6, 2020 - 4:04:03 AM
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Olivier Manches, Gabrielle Lui, Jean Paul Molens, Jean Jacques Sotto, Laurence Chaperot, et al.. Whole lymphoma B cells allow efficient cross-presentation of antigens by dendritic cells.. Cytotherapy, Elsevier, 2008, 10 (6), pp.642-9. ⟨10.1080/14653240802317647⟩. ⟨inserm-00332094⟩



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