The Journal of Experimental Medicine
Aegean Conferences: 2009 Conferences
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Published 17 December 2001. doi:10.1084/jem.194.12.1823
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© Rockefeller University Press, 0022-1007/2001/12/1823/ $5.00
The Journal of Experimental Medicine, Volume 194, Number 12, December 17, 2001 1823-1834


Original Article

BDCA-2, a Novel Plasmacytoid Dendritic Cell–specific Type II C-type Lectin, Mediates Antigen Capture and Is a Potent Inhibitor of Interferon {alpha}/ß Induction

Andrzej Dzionek1, Yoshiaki Sohma2, Jun Nagafune2, Marina Cella3, Marco Colonna3, Fabio Facchetti4, Gritt Günther1, Ian Johnston1, Antonio Lanzavecchia5, Tomoko Nagasaka2, Tsutomu Okada2, William Vermi4, Gregor Winkels1, Terumi Yamamoto2, Monika Zysk1, Yasunori Yamaguchi2 and Jürgen Schmitz1

1 Miltenyi Biotec GmbH, D-51429 Bergisch Gladbach, Germany
2 Pharmaceutical Research Laboratory, Kirin Brewery Company, Limited, Gunma 370-1295, Japan
3 Basel Institute for Immunology, CH-4005 Basel, Switzerland
4 Department of Pathology, University of Brescia, Spedali Civili Brescia, 1-25124 Brescia, Italy
5 Institute for Research in Biomedicine, CH-6500 Bellinzona, Switzerland

Address correspondence to J. Schmitz, Miltenyi Biotec GmbH, Friedrich-Ebert-Strabe 68, D-51429 Bergisch Gladbach, Germany. Phone: 49-2204-8306-410; Fax: 49-2204-85197; E-mail: juergenS{at}miltenyibiotec.de

Plasmacytoid dendritic cells are present in lymphoid and nonlymphoid tissue and contribute substantially to both innate and adaptive immunity. Recently, we have described several monoclonal antibodies that recognize a plasmacytoid dendritic cell-specific antigen, which we have termed BDCA-2. Molecular cloning of BDCA-2 revealed that BDCA-2 is a novel type II C-type lectin, which shows 50.7% sequence identity at the amino acid level to its putative murine ortholog, the murine dendritic cell–associated C-type lectin 2. Anti–BDCA-2 monoclonal antibodies are rapidly internalized and efficiently presented to T cells, indicating that BDCA-2 could play a role in ligand internalization and presentation. Furthermore, ligation of BDCA-2 potently suppresses induction of interferon {alpha}/ß production in plasmacytoid dendritic cells, presumably by a mechanism dependent on calcium mobilization and protein-tyrosine phosphorylation by src-family protein-tyrosine kinases. Inasmuch as production of interferon {alpha}/ß by plasmacytoid dendritic cells is considered to be a major pathophysiological factor in systemic lupus erythematosus, triggering of BDCA-2 should be evaluated as therapeutic strategy for blocking production of interferon {alpha}/ß in systemic lupus erythematosus patients.

Key Words: interferon type I • monoclonal antibodies • magnetic cell sorting • interferon inducers • systemic lupus erythematosus


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