alexa Alternatively activated alveolar macrophages in pulmonary fibrosis-mediator production and intracellular signal transduction.
Immunology

Immunology

Journal of Clinical & Cellular Immunology

Author(s): Pechkovsky DV, Prasse A, Kollert F, Engel KM, Dentler J,

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Abstract Activated macrophages have been characterized as M1 and M2 according to their inflammatory response pattern. Here we analyzed the M2 marker expression and intracellular signal transduction in the course of cytokine-driven differentiation. We found elevated spontaneous production of the chemokines CCL17, CCL18 and CCL22 and increased expression of CD206 by alveolar macrophages from patients with lung fibrosis. Stimulation of normal human AM with Th2 cytokines IL-4 and/or IL-10 in vitro revealed IL-4 as the most powerful inducer of M2-phenotype in AM and monocytes. Importantly, IL-10 enhanced IL-4-induced expression of CCL18 and IL-1RA in a synergistic fashion. IL-4/IL-10 stimulation induces a strong activation of STAT3 in AM from fibrosis patients. These results suggest an important role for M2 polarized AM in the pathogenesis of pulmonary fibrosis and indicate that both IL-4 and IL-10 account for human AM phenotype shift to M2, as seen in patients with fibrotic interstitial lung diseases. Copyright © 2010 Elsevier Inc. All rights reserved. This article was published in Clin Immunol and referenced in Journal of Clinical & Cellular Immunology

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