Cutting edge: dendritic cells copulsed with microbial and helminth antigens undergo modified maturation, segregate the antigens to distinct intracellular compartments, and concurrently induce microbe-specific Th1 and helminth-specific Th2 responses.
To examine the ability of dendritic cells (DC) to discriminate between helminth and microbial Ag and induce appropriately polarized Th responses, mouse DC were copulsed with the helminth Ag, schistosome egg Ag (SEA), along with the bacterium Proprionebacterium acnes, Pa, and transferred into wild-type mice. Strikingly, SEA/Pa-copulsed DC induced concurrent Pa-specific Th1 (but not Th2) responses and SEA-specific Th2 (but not Th1) responses. Although DC exposed to both Ag undergo many of the maturation-associated changes that accompany exposure to Pa alone, Pa-induced IL-12 production was inhibited by SEA. Examination of Ag uptake revealed that SEA and Pa are acquired via discrete pathways and enter nonoverlapping intracellular compartments. Data suggest that segregation of SEA and Pa into distinct compartments, coupled with SEA-induced modifications of the DC maturation pathway, are significant components of the ability of DC to interpret signals inherent to SEA and Pa and induce appropriately polarized Th responses.
Cervi
Laura
L
Departments of. Pathobiology and Biology, University of Pennsylvania, Philadelphia, PA 19104, USA.
MacDonald
Andrew S
AS
Kane
Colleen
C
Dzierszinski
Florence
F
Pearce
Edward J
EJ
D000818:Animals; D017951:Antigen Presentation; D000942:Antigens, Bacterial / Q000276:immunology* / Q000378:metabolism; D000947:Antigens, Helminth / Q000276:immunology* / Q000378:metabolism; D018122:B7-1 Antigen / Q000096:biosynthesis; D002454:Cell Differentiation / Q000276:immunology; D002478:Cells, Cultured; D003713:Dendritic Cells / Q000276:immunology* / Q000382:microbiology / Q000469:parasitology / Q000637:transplantation; D018984:Epitopes, T-Lymphocyte / Q000276:immunology*; D005260:Female; D000949:Histocompatibility Antigens Class II / Q000096:biosynthesis; D007424:Intracellular Fluid / Q000276:immunology* / Q000382:microbiology / Q000469:parasitology; D051379:Mice; D008810:Mice, Inbred C57BL; D011425:Propionibacterium acnes / Q000276:immunology; D012547:Schistosoma / Q000276:immunology*; D018417:Th1 Cells / Q000276:immunology* / Q000382:microbiology / Q000469:parasitology; D018418:Th2 Cells / Q000276:immunology* / Q000382:microbiology / Q000469:parasitology
D000942:Antigens, Bacterial; D000947:Antigens, Helminth; D018122:B7-1 Antigen; D018984:Epitopes, T-Lymphocyte; D000949:Histocompatibility Antigens Class II