Abstract
Splenic CD169+ macrophages are located in the marginal zone to efficiently capture blood-borne pathogens. Here, we investigate the requirements for the induction of CD8+ T cell responses by antigens (Ags) bound by CD169+ macrophages. Upon Ag targeting to CD169+ macrophages, we show that BATF3-dependent CD8α+ dendritic cells (DCs) are crucial for DNGR-1-mediated cross-priming of CD8+ T cell responses. In addition, we demonstrate that CD169, a sialic acid binding lectin involved in cell-cell contact, preferentially binds to CD8α+ DCs and that Ag transfer to CD8α+ DCs and subsequent T cell activation is dependent on the sialic acid-binding capacity of CD169. Finally, functional CD169 mediates optimal CD8+ T cell responses to modified vaccinia Ankara virus infection. Together, these data indicate that the collaboration of CD169+ macrophages and CD8α+ DCs for the initiation of effective CD8+ T cell responses is facilitated by binding of CD169 to sialic acid containing ligands on CD8α+ DCs.
Original language | English |
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Pages (from-to) | 1484-1495 |
Number of pages | 12 |
Journal | Cell Reports |
Volume | 22 |
Issue number | 6 |
DOIs | |
Publication status | Published - 6 Feb 2018 |
Keywords
- Journal article
- CD169
- Siglec-1
- Sialoadhesin
- macrophage
- dendritic cell
- antigen
- T cell response
- cross-presentation
- DNGR-1
- vaccinia
ASJC Scopus subject areas
- General Biochemistry,Genetics and Molecular Biology