Abstract
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.
| Original language | English |
|---|---|
| Journal | Nature Immunology |
| Volume | 12 |
| Issue number | 12 |
| Pages (from-to) | 1194-1201 |
| Number of pages | 8 |
| ISSN | 1529-2908 |
| DOIs | |
| Publication status | Published - 12.2011 |
Funding
We thank S. Gordon, P. Lachmann and H. Wagner for input; M. Botto (Imperial College, London) for C1qa−/−mice; M. Carroll (Harvard Medical School) for C3−/− and C4b−/− mice; C. Gerard (Harvard Medical School) for C3ar−/− mice; F. Petry (Johannes Gutenberg University of Mainz, Germany) for C1qa−/− mice; M. van der Linden (University Hospital Aachen, Germany) for Streptococcus strains; S. Feihl and V. Greifenberg for bacterial typing; L. Henkel, M. Schiemann and K. Wild for flow cytometry cell sorting; K. Mink, S. Vieweg and A. Wanisch for experimental assistance; and L. Layland for support preparing the manuscript. Supported by the German Research Foundation SFB 914 (TP-B4 to A.V. and D.H.B.) and SFB 576 (TP-A8 to D.H.B.), the Swiss National Foundation (3100AO-100779/2 and 3100AO-100068/2 to H.H. and R.M.Z.), the German Center for Infection Research (DZIF; D.H.B.) and the European Commission (Marie Curie Fellowship to A.V.).
Research Areas and Centers
- Academic Focus: Center for Infection and Inflammation Research (ZIEL)