| First Author | Bozzacco L | Year | 2010 |
| Journal | Eur J Immunol | Volume | 40 |
| Issue | 1 | Pages | 36-46 |
| PubMed ID | 19830741 | Mgi Jnum | J:155704 |
| Mgi Id | MGI:4415114 | Doi | 10.1002/eji.200939748 |
| Citation | Bozzacco L, et al. (2010) HIV gag protein is efficiently cross-presented when targeted with an antibody towards the DEC-205 receptor in Flt3 ligand-mobilized murine DC. Eur J Immunol 40(1):36-46 |
| abstractText | DC present exogenous proteins to MHC class I-restricted CD8+ T cells. This function does not require endogenous antigen synthesis within DC, providing the potential to elicit CD8+ T-cell responses to immune complexes, inactivated microbes, dying cells, and proteins such as OVA. In mice, the CD8+ or DEC-205+ DC are specialized for cross-presentation, and this subset can be increased 10-fold in numbers following Fms-like tyrosine kinase 3 ligand (Flt3L) treatment in vivo. Therefore, we studied cross-presentation by abundant Flt3L DC using HIV gag protein. When enriched by positive selection with anti-CD11c beads, cells from Flt3L mice are not only more abundant but are also more highly enriched in CD11chigh DC, particularly the DEC-205+ subset. DC cross-present HIV gag to primed CD8+ T cells, but when the antigen is delivered within an antibody to DEC-205 receptor, cross-presentation becomes 100-fold more efficient than non-targeted antigen. This finding requires gag to be engineered into anti-DEC antibody, not just mixed with antibody. Flt3L DC are a valuable tool to study cross-presentation, since their use overcomes the obstacle posed by the low number of cross-presenting DC in the steady state. These findings support future experiments to use Flt3L to enhance presentation of DC-targeted vaccines. |
