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Original Article |
Correspondence to: Martin Röcken, Department of Dermatology and Allergology, Ludwig-Maximilians-University Munich, Frauenlobstr. 9-11, 80337 Munich, Germany. Tel:49-89-5160-6205 Fax:49-89-5160-6206
Polymorphonuclear leukocytes (PMNs) characterize the pathology of T cellmediated autoimmune diseases and delayed-type hypersensitivity reactions (DTHRs) in the skin, joints, and gut, but are absent in T cellmediated autoimmune diseases of the brain or pancreas. All of these reactions are mediated by interferon
producing type 1 T cells and produce a similar pattern of cytokines. Thus, the cells and mediators responsible for the PMN recruitment into skin, joints, or gut during DTHRs remain unknown. Analyzing hapten-induced DTHRs of the skin, we found that mast cells determine the T celldependent PMN recruitment through two mediators, tumor necrosis factor (TNF) and the CXC chemokine macrophage inflammatory protein 2 (MIP-2), the functional analogue of human interleukin 8. Extractable MIP-2 protein was abundant during DTHRs in and around mast cells of wild-type (WT) mice but absent in mast celldeficient WBB6F1-KitW/KitW-v (KitW/KitW-v) mice. T celldependent PMN recruitment was reduced >60% by antiMIP-2 antibodies and >80% in mast celldeficient KitW/KitW-v mice. Mast cells from WT mice efficiently restored DTHRs and MIP-2dependent PMN recruitment in KitW/KitW-v mice, whereas mast cells from TNF-/- mice did not. Thus, mast cellderived TNF and MIP-2 ultimately determine the pattern of infiltrating cells during T cellmediated DTHRs.
Key Words: chemokines, inflammation, type 1 T cells, cytokines, autoimmune disease
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