Dendritic cells pulsed with intact Streptococcus pneumoniae elicit both protein- and polysaccharide-specific immunoglobulin isotype responses in vivo through distinct mechanisms.
Immature bone marrow-derived myeloid dendritic cells (BMDCs) are induced to undergo phenotypic maturation and secretion of tumor necrosis factor (TNF)-alpha, interleukin (IL)-6, IL-12, and IL-10 when pulsed in vitro with intact Streptococcus pneumoniae. After transfer to naive mice, pulsed BMDCs induce immunoglobulin (Ig) isotype responses specific for both protein and polysaccharide pneumococcal antigens, having in common the requirement for viable BMDCs, T cells, and B7-dependent costimulation in the recipient mice. Whereas primary Ig isotype responses to bacterial proteins uniformly require BMDC expression of major histocompatibility complex class II, CD40, and B7, and the secretion of IL-6, but not IL-12, similar requirements for antipolysaccharide Ig responses were only observed for the IgG1 isotype.
Colino
Jesus
J
Department of Pathology, Uniformed Services University of the Health Sciences, Bethesda, MD 20814, USA.
Shen
Yi
Y
Snapper
Clifford M
CM
D000818:Animals; D000907:Antibodies, Bacterial / Q000096:biosynthesis; D000918:Antibody Specificity; D000942:Antigens, Bacterial / Q000276:immunology; D018122:B7-1 Antigen / Q000276:immunology; D001426:Bacterial Proteins / Q000276:immunology*; D001854:Bone Marrow Cells / Q000276:immunology; D002454:Cell Differentiation; D002478:Cells, Cultured; D003713:Dendritic Cells / Q000166:cytology / Q000276:immunology* / Q000637:transplantation; D007132:Immunoglobulin Isotypes / Q000096:biosynthesis*; D007156:Immunologic Memory; D016753:Interleukin-10 / Q000378:metabolism; D018664:Interleukin-12 / Q000378:metabolism; D015850:Interleukin-6 / Q000378:metabolism; D051379:Mice; D008810:Mice, Inbred C57BL; D008817:Mice, Mutant Strains; D010587:Phagocytosis; D010767:Phosphorylcholine / Q000276:immunology; D011135:Polysaccharides, Bacterial / Q000276:immunology*; D013296:Streptococcus pneumoniae / Q000276:immunology*; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism
D000907:Antibodies, Bacterial; D000942:Antigens, Bacterial; D018122:B7-1 Antigen; D001426:Bacterial Proteins; D007132:Immunoglobulin Isotypes; D015850:Interleukin-6; D011135:Polysaccharides, Bacterial; D014409:Tumor Necrosis Factor-alpha; C051592:pneumococcal surface protein A; D010767:Phosphorylcholine; D016753:Interleukin-10; D018664:Interleukin-12