NFAT activation in innate immune cells dictates the sterilization of C

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NFAT activation in innate immune cells dictates the sterilization of C

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Presentation transcript:

NFAT activation in innate immune cells dictates the sterilization of C NFAT activation in innate immune cells dictates the sterilization of C. albicans skin infection. NFAT activation in innate immune cells dictates the sterilization of C. albicans skin infection. Schematic of C. albicans skin infection containment and elimination. Distinct phases can be identified in the inflammatory process that takes place after C. albicans skin infections. During the very early phases (1), granulocytes are recruited and form an abscess around the invading microorganisms to avoid infection spreading. The containment of the infection is ensured by fibroblasts that, once activated by TGF-β, proliferate and deposit collagen around the abscess to form a capsule. Later, IFN-γ, produced by NK cells activated in the draining lymph nodes (dLN), antagonizes TGF-β and thus avoids excessive fibroblast activation and excessive collagen deposition and also avoids the differentiation of fibroblasts into myofibroblasts (2). Last, IFN-γ ensures the activation of the fibrinolytic system and the consequent activation of metalloproteinases by plasmin (3). During the elimination phase, proteinases digest the collagen capsule and induce skin ulceration for the microbial expulsion out of the skin (3). NFATc2 activation in DCs after C. albicans exposure leads to IL-2 production. In turn, IL-2 is required to elicit IFN-γ release by NK cells (2). In the absence of NFATc2, IFN-γ is not produced in sufficient amount to counteract the TGF-β pathway (2 Nfatc2−/−) and to induce the activation of the fibrinolytic system (3 Nfatc2−/−); therefore, fibroblasts are hyperactive, deposit excessive collagen, and differentiate in myofibroblasts (3 Nfatc2−/−). This leads to the formation of a thick capsule that prevents skin ulceration and microbial expulsion out of the skin. William Santus et al. Sci. Immunol. 2017;2:eaan2725 Copyright © 2017 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works