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Departments of
*
Infectious Diseases and Microbiology, Graduate School of Public Health, and
Cell Biology and Physiology, School of Medicine, University of Pittsburgh, Pittsburgh, PA 15261
Monocyte-derived dendritic cells (DC) possess the unique capacity to capture Ag from live cells through intimate cell contact, a process referred to as nibbling. We sought to define the receptor(s) mediating DC nibbling. Uptake of fluorescently labeled plasma membrane from live cells by DC was inhibited by protease treatment and by a panel of polyanionic ligands, implicating scavenger receptors (SR) in this process. Differential expression of SR on DC and macrophages correlated with the capacity to acquire membrane from live cells. 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. DC capture of fluorescently labeled membrane from live cells was partially blocked by SR-A-specific Ab, suggesting that other SR may also be contributing to nibbling. DC maturation resulted in a switch in expression from type II SR-A (SR-AII) to the SR-AI splice variant. Finally, SR-A was identified on interdigitating DC isolated from monkey lymph nodes. These findings define a novel role for SR-A, and suggest that Ag uptake from live cells by DC may be important in the generation of immunity and in the maintenance of peripheral tolerance in vivo.
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