International Immunology, Vol. 14, No. 5, pp. 433-444,
May 2002
© 2002 Japanese Society for Immunology
Identification and expression of mouse Langerin (CD207) in dendritic cells
1 Laboratory of Immunobiology, Department of Animal Development and Physiology, Division of Systemic Life Science, Graduate School of Biostudies, and 2 Department of Zoology, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan 3 Laboratory of Cytogenetics, Division of Bioscience, Graduate School of Environmental Earth Science and 4 Chromosome Research Unit, Faculty of Science, Hokkaido University, Hokkaido 060-08IO, Japan 5 Department of Cell Biology and Histology, Academic Medical Center (AMC), University of Amsterdam, 1105AZ Amsterdam, The Netherlands 6 National Cancer Institute, NIH, Bethesda, MD 20892-5055, USA 7 Laboratory of Cellular Physiology and Immunology, The Rockefeller University, New York, NY 10021-6399, USA
Correspondence to: K. Inaba; E-mail: kayo{at}lif.kyoto-u.ac.jp
Transmitting editor: T. Hirano
We have cloned the mouse homologue of human Langerin (h-Langerin), a type II transmembrane protein with a single external C-type lectin domain. Mouse Langerin (m-Langerin) displays 65 and 74% homologies in total amino acid and lectin domains with those of h-Langerin. The cognate mouse and rat genes were assigned to chromosome 6D1D2 and chromosome 4q33 distalq34.1 proximal respectively, syntenic to the h-Langerin gene on chromosome 2p13. With RT-PCR, m-Langerin transcripts were as expected detected in MHC class II+, but not MHC class II, cells from epidermis and the expression level was reduced by culture. However, m-Langerin transcripts were also expressed in spleen, lymph nodes (LN), thymus, liver, lung and even heart, but not gut-associated lymphoid tissues. In single-cell lymphoid suspensions, m-Langerin transcripts were mainly detected in the CD11c+ dendritic cells (DC), especially the CD11blow/CD8high fraction of spleen and LN. DC generated from bone marrow precursors by granulocyte macrophage colony stimulating factor (GM-CSF) expressed m-Langerin, but this was shut down during maturation with CD40 ligand or lipopolysaccharide. DC derived from blood monocytes by GM-CSF + IL-4 lacked m-Langerin unless the cultures were supplemented with transforming growth factor (TGF)-ß1. Unexpectedly, significant amounts of m-Langerin transcripts were detected in skin and LN of TGF-ß1-deficient mice, although in much lower amounts than littermate controls. Recombinant m-Langerin could form multimers and bind to mannanagarose. These findings indicate that Langerin expression is regulated at several levels: by TGF-ß1, DC subsets, DC maturation and the tissue environment.
Keywords: Birbeck granules, C-type lectin, gene mapping, Langerhans cells, multimer, transforming growth factor-ß1
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