| First Author | Matheoud D | Year | 2010 |
| Journal | Blood | Volume | 115 |
| Issue | 22 | Pages | 4412-20 |
| PubMed ID | 20308597 | Mgi Jnum | J:161555 |
| Mgi Id | MGI:4459606 | Doi | 10.1182/blood-2009-11-255935 |
| Citation | Matheoud D, et al. (2010) Cross-presentation by dendritic cells from live cells induces protective immune responses in vivo. Blood 115(22):4412-20 |
| abstractText | Cross-presentation is an essential mechanism that allows dendritic cells (DCs) to efficiently present exogenous antigens to CD8(+) T cells. Among cellular antigen sources, apoptotic cells are commonly considered as the best for cross-presentation by DCs. However, the potential of live cells as a source of antigen has been overlooked. Here we explored whether DCs were able to capture and cross-present antigens from live cells. DCs internalized cytosolic and membrane material into vesicles from metabolically labeled live cells. Using time-lapse confocal microscopy in whole spleens, we showed that DCs internalized material from live cells in vivo. After ovalbumin uptake from live cells, DCs cross-primed ovalbumin-specific naive OT-I CD8(+) T cells in vitro. Injected into mice previously transferred with naive OT-I T cells, they also cross-primed in vivo, even in the absence of endogenous DCs able to present the epitope in the recipient mice. Interestingly, DCs induced stronger natural CD8(+) T-cell responses and protection against a lethal tumor challenge after capture of antigens from live melanoma cells than from apoptotic melanoma cells. The potential for cross-presentation from live cells uncovers a new type of cellular intercommunication and must be taken into account for induction of tolerance or immunity against self, tumors, grafts, or pathogens. |
