Dendritic cells that endocytosed antigen-containing IgG-liposomes elicit effective antitumor immunity

Journal of Immunotherapy
Kazuko KawamuraTakashi Uchiyama

Abstract

Liposomes represent a promising vehicle to deliver exogenous antigens to dendritic cells (DCs) for tumor immunotherapy. Targeting exogenous antigens to Fcgamma receptors on DCs has been shown to result in efficient presentation of antigen-derived peptides on major histocompatibility complex (MHC) class I and class II molecules. In this study, it was investigated whether DCs that endocytosed physicochemically optimized antigen-containing liposomes conjugated with IgG efficiently present antigens on MHC class I and class II molecules, and consequently induce strong antitumor immune responses. IgG-conjugated liposomes that were 200 nm in diameter without attaching polyethylene glycol were most efficiently endocytosed by DCs. Human monocyte-derived DCs that endocytosed tetanus toxoid (TT)-containing IgG liposomes via CD32 stimulated CD4(+) T cells more strongly than DCs pulsed with TT-containing bare liposomes or with soluble TT. Immunization of mice with DCs that endocytosed ovalbumin (OVA)-containing IgG liposomes but not OVA-containing bare liposomes or soluble OVA completely prevented the growth of OVA-expressing lymphoma cells. Importantly, administration of DCs that endocytosed OVA-containing IgG liposomes to the mice with es...Continue Reading

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