Evasion of peptide, but not lipid antigen presentation, through pathogen-induced dendritic cell maturation.

ABSTRACT: Dendritic cells (DC) present lipid and peptide antigens to T cells on CD1 and MHC Class II (MHCII), respectively. The relative contribution of these systems during the initiation of adaptive immunity after microbial infection is not characterized. MHCII molecules normally acquire antigen and rapidly traffic from phagolysosomes to the plasma membrane as part of DC maturation, whereas CD1 molecules instead continually recycle between these sites before, during, and after DC maturation. We find that in Mycobacterium tuberculosis (Mtb)-infected DCs, CD1 presents antigens quickly. Surprisingly, rapid DC maturation results in early failure and delay in MHCII presentation. Whereas both CD1b and MHCII localize to bacterial phagosomes early after phagocytosis, MHCII traffics from the phagosome to t

SUBMITTER: Hava DL 

PROVIDER: S-EPMC2516216 | biostudies-literature | 2008 Aug

REPOSITORIES: biostudies-literature