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Original Article |
Is Expressed at Inflamed Epithelial Surfaces and Is the Most Potent Chemokine Known in Attracting Langerhans Cell Precursors
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
plays a central role in LC precursor recruitment into the epithelium during inflammation. (a) Among DC populations, MIP-3
was the most potent chemokine inducing the selective migration of in vitrogenerated CD34+ hematopoietic progenitor cellderived LC precursors and skin LCs in accordance with the restricted MIP-3
receptor (CC chemokine receptor 6) expression to these cells. (b) MIP-3
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
. (c) In vivo, MIP-3
was selectively produced at sites of inflammation as illustrated in tonsils and lesional psoriatic skin where MIP-3
upregulation appeared associated with an increase in LC turnover. (d) Finally, the secretion of MIP-3
was strongly upregulated by cells of epithelial origin after inflammatory stimuli (interleukin 1ß plus tumor necrosis factor
) or T cell signals. Results of this study suggest a major role of MIP-3
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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