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A platelet-mediated system for shuttling blood-borne bacteria to CD8α+ dendritic cells depends on glycoprotein GPIb and complement C3.
Nat. Immunol. 12, 1194-1201 (2011)
The acquisition of pathogen-derived antigen by dendritic cells (DCs) is a key event in the generation of cytotoxic CD8(+) T cell responses. In mice, the intracellular bacterium Listeria monocytogenes is directed from the blood to splenic CD8α(+) DCs. We report that L. monocytogenes rapidly associated with platelets in the bloodstream in a manner dependent on GPIb and complement C3. Platelet association targeted a small but immunologically important portion of L. monocytogenes to splenic CD8α(+) DCs, diverting bacteria from swift clearance by other, less immunogenic phagocytes. Thus, an effective balance is established between maintaining sterility of the circulation and induction of antibacterial immunity by DCs. Other Gram-positive bacteria also were rapidly tagged by platelets, revealing a broadly active shuttling mechanism for systemic bacteria.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
Listeria-monocytogenes infection; Marginal zone; T-cells; Immune-responses; In-vivo; Receptor; Antigens; Phagocytosis; Macrophages; Spleen
ISSN (print) / ISBN
1529-2908
e-ISSN
1529-2916
Journal
Nature Immunology
Quellenangaben
Volume: 12,
Issue: 12,
Pages: 1194-1201
Publisher
Nature Publishing Group
Non-patent literature
Publications
Reviewing status
Peer reviewed