几种抗原呈递细胞的比较 Dendritic cell Macrophage B Lymphocyte Resting Activated Resting Activated Class I C1ass】 LPS MHC MHC Class I Class II Class I MHC Class II MHC MHC MHC Class Il】 Class l 1B7 MHC MHC MHC Endocytosis Antigen uptake Phagocytosis Phagocytosis Receptor-mediated Receptor-mediated phagocytosis endocytosis endocytosis (by Langerhans cells) CkssⅡMHC Constitutive Inducible Inducible Constitutive Constitutive expression (+++) -) (++) (++) (+++) Co-stimulatory Constitutive B7 Inducible B7 Inducible B7 Inducible B7 Inducible B7 activity (+++) -） (++) -) (++) Naive T cells Effector T cells Effector T cells Naive T cells T-cell activation Effector T cells Memory T cells Memory T cells Effector T cells Memory T cells Memory T cells 几种抗原呈递细胞的比较