Identifiers
HUGO:MSR1
References
DENDRITIC_CELL
CASCADE:MSR1
PMID:12594251
Dendritic cells can capture the antigens through the ???nibbling??? of live tumour cells, Class A Scavenger Receptor (MSR1) regulates the process.
Internalized membrane colocalized with SR ligand and entered the endosomal pathway.
DC very efficiently acquired and internalized gp100 tumor Ag expressed at the surface of viable adenocarcinoma cells via recombinant adenoviral infection. Cross-presentation of gp100 by DC to MHC class I-restricted T cells was inhibited by polyanionic SR ligand and an Ab to type A SR (SR-A), whereas Ab to the class B SR CD36, which mediates uptake of apoptotic cells, induced no inhibition.
References
in_re1( Innate Immunity ):
PMID:10837075
Immature DCs are very efficient in Ag capture and can use several pathways, such as (a) macropinocytosis; (b) receptor-mediated endocytosis via C-type lectin receptors (mannose receptor, DEC-205)
or Fc?? receptor types I (CD64) and II (CD32) [uptake of immune complexes or opsonized particles ]; and (c) phagocytosis of particles such as latex beads , apoptotic and necrotic cell fragments (involving CD36 and ??v??3 or ??v??5 integrins), viruses, and bacteria including mycobacteria, as well as intracellular parasites such as Leishmania major. DCs can also internalize the peptide loaded heat shock proteins gp96 and Hsp70 through presently unknown mechanisms