International Immunology Advance Access originally published online on March 18, 2005
International Immunology 2005 17(5):539-547; doi:10.1093/intimm/dxh232
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Highly efficient antigen targeting to M-DC8+ dendritic cells via Fc
RIII/CD16-specific antibody conjugates
1 Micromet AG, Staffelseestrasse 2, 81477 Munich, Germany
2 Institute for Immunology, Ludwig-Maximilians-University, Goethestrasse 31, 80336 Munich, Germany
3 Techno Venture Management, Maximilianstrasse 35C, 80539 Munich, Germany
Correspondence to: P. Kufer; E-mail: peter.kufer{at}micromet.de
Conjugates of peptide antigens with antibodies specifically recognizing surface molecules on dendritic cells (DC) represent an attractive approach to target antigens to antigen-presenting cells (APC) for the induction of specific T cell responses. The present study evaluates the potential of M-DC8+ DC, a sub-population of professional APC in the blood, for an antibody-based vaccination strategy. We prepared, by chemical cross-linking, conjugates of peptide model antigens with antibodies directed against different cell surface molecules of DC. Antigenpeptide conjugates using an anti-CD16 (Fc
RIII) antibody were most potent in inducing in vitro activation of a specific CD4+ T cell response. They were at least 300 times more efficient than two other antibodyantigen conjugates and
500 times more efficient than unconjugated antigen peptides. Our data demonstrate that specific antigen targeting via CD16 on M-DC8+ DC is a promising vaccination approach for the efficient induction of specific CD4+ T cell responses ex vivo, and perhaps in vivo.
Keywords: antibodies, antigen presentation, dendritic cells, Fc receptors, vaccination
Transmitting editor: T. Huenig
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