The Journal of Experimental Medicine
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Published online 5 September 2000.
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© The Rockefeller University Press, 0022-1007/2000/9/705/ $5.00
The Journal of Experimental Medicine, Volume 192, Number 5, September 5, 2000 705-718


Original Article

Macrophage Inflammatory Protein 3{alpha} Is Expressed at Inflamed Epithelial Surfaces and Is the Most Potent Chemokine Known in Attracting Langerhans Cell Precursors

Marie-Caroline Dieu-Nosjeana, Catherine Massacriera, Bernhard Homeyb, Béatrice Vanbervlieta, Jean-Jacques Pina, Alain Vicaria, Serge Lebecquea, Colette Dezutter-Dambuyantc, Daniel Schmittc, Albert Zlotnikb, and Christophe Cauxa
a Laboratory for Immunological Research, Schering-Plough, 69571 Dardilly, France
b DNAX Research Institute, Palo Alto, California 94304
c Institut National de la Santé et de la Recherche Médicale, U346, Centre Hospitalier Edouard Herriot, 69437 Lyon, France

Correspondence to: Christophe Caux, Schering-Plough, 27 chemin des Peupliers, BP 11, 69571 Dardilly, France. Tel:33-4-72-17-27-00 Fax:33-4-78-35-47-50 E-mail:christophe.caux{at}spcorp.com.

Dendritic cells (DCs) form a network comprising different populations that initiate and differentially regulate immune responses. Langerhans cells (LCs) represent a unique population of DCs colonizing epithelium, and we present here observations suggesting that macrophage inflammatory protein (MIP)-3{alpha} plays a central role in LC precursor recruitment into the epithelium during inflammation. (a) Among DC populations, MIP-3{alpha} was the most potent chemokine inducing the selective migration of in vitro–generated CD34+ hematopoietic progenitor cell–derived LC precursors and skin LCs in accordance with the restricted MIP-3{alpha} receptor (CC chemokine receptor 6) expression to these cells. (b) MIP-3{alpha} was mainly produced by epithelial cells, and the migration of LC precursors induced by the supernatant of activated skin keratinocytes was completely blocked with an antibody against MIP-3{alpha}. (c) In vivo, MIP-3{alpha} was selectively produced at sites of inflammation as illustrated in tonsils and lesional psoriatic skin where MIP-3{alpha} upregulation appeared associated with an increase in LC turnover. (d) Finally, the secretion of MIP-3{alpha} was strongly upregulated by cells of epithelial origin after inflammatory stimuli (interleukin 1ß plus tumor necrosis factor {alpha}) or T cell signals. Results of this study suggest a major role of MIP-3{alpha} in epithelial colonization by LCs under inflammatory conditions and immune disorders, and might open new ways to control epithelial immunity.

Key Words: dendritic cell, chemokine, migration, regulation, in vivo expression


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