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*
Schering-Plough Laboratory for Immunological Research, Dardilly, France;
Institut National de la Santé et de la Recherche Médicale Unité 346, Centre Hospitalier Edouard Herriot, Lyon, France;
Institut National de la Santé et de la Recherche Médicale Unité 491, Faculté de Médecine, Marseille, France;
Centre dImmunologie, Institut National de la Santé et de la Recherche Médicale-Centre National de la Recherche Scientifique, Marseille, France;
¶ Department of Dermatology, University of Innsbruck, Innsbruck, Austria
Human (h)Langerin/CD207 is a C-type lectin of Langerhans cells (LC)
that induces the formation of Birbeck granules (BG). In this study, we
have cloned a cDNA-encoding mouse (m)Langerin. The predicted protein is
66% homologous to hLangerin with conservation of its particular
features. The organization of human and mouse Langerin
genes are similar, consisting of six exons, three of which encode the
carbohydrate recognition domain. The mLangerin gene maps to
chromosome 6D, syntenic to the human gene on chromosome 2p13. mLangerin
protein, detected by a mAb as a 48-kDa species, is abundant in
epidermal LC in situ and is down-regulated upon culture. A subset of
cells also expresses mLangerin in bone marrow cultures supplemented
with TGF-
. Notably, dendritic cells in thymic medulla are
mLangerin-positive. By contrast, only scattered cells express mLangerin
in lymph nodes and spleen. mLangerin mRNA is also detected in some
nonlymphoid tissues (e.g., lung, liver, and heart). Similarly to
hLangerin, a network of BG form upon transfection of mLangerin cDNA
into fibroblasts. Interestingly, substitution of a conserved residue
(Phe244 to Leu) within the carbohydrate recognition domain
transforms the BG in transfectant cells into structures resembling
cored tubules, previously described in mouse LC. Our findings should
facilitate further characterization of mouse LC, and provide insight
into a plasticity of dendritic cell organelles which may have important
functional consequences.
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