title: PPARγ controls Dectin-1 expression required for host antifungal defense against Candida albicans.
abstract: We recently showed that IL-13 or peroxisome proliferator activated receptor gamma (PPARgamma) ligands attenuate Candida albicans colonization of the gastrointestinal tract. Here, using a macrophage-specific Dectin-1 deficient mice model, we demonstrate that Dectin-1 is essential to control fungal gastrointestinal infection by PPARgamma ligands. We also show that the phagocytosis of yeast and the release of reactive oxygen intermediates in response to Candida albicans challenge are impaired in macrophages from Dectin-1 deficient mice treated with PPARgamma ligands or IL-13. Although the Mannose Receptor is not sufficient to trigger antifungal functions during the alternative activation of macrophages, our data establish the involvement of the Mannose Receptor in the initial recognition of non-opsonized Candida albicans by macrophages. We also demonstrate for the first time that the modulation of Dectin-1 expression by IL-13 involves the PPARgamma signaling pathway. These findings are consistent with a crucial role for PPARgamma in the alternative activation of macrophages by Th2 cytokines. Altogether these data suggest that PPARgamma ligands may be of therapeutic value in esophageal and gastrointestinal candidiasis in patients severely immunocompromised or with metabolic diseases in whom the prevalence of candidiasis is considerable.
authors.affiliation: UMR-MD3 EA2405 Université de Toulouse III; UPS; Polarisation des Macrophages et Récepteurs Nucléaires dans les Pathologies Inflammatoires et Infectieuses, PMRNP2I, Toulouse, France.
authors.forename: Amandine
authors.initials: A
authors.lastname: Galès
authors.forename: Annabelle
authors.initials: A
authors.lastname: Conduché
authors.forename: José
authors.initials: J
authors.lastname: Bernad
authors.forename: Lise
authors.initials: L
authors.lastname: Lefevre
authors.forename: David
authors.initials: D
authors.lastname: Olagnier
authors.forename: Maryse
authors.initials: M
authors.lastname: Béraud
authors.forename: Guillaume
authors.initials: G
authors.lastname: Martin-Blondel
authors.forename: Marie-Denise
authors.initials: MD
authors.lastname: Linas
authors.forename: Johan
authors.initials: J
authors.lastname: Auwerx
authors.forename: Agnès
authors.initials: A
authors.lastname: Coste
authors.forename: Bernard
authors.initials: B
authors.lastname: Pipy
mesh_terms: D000818:Animals; D002176:Candida albicans / Q000276:immunology; D002177:Candidiasis / Q000276:immunology* / Q000378:metabolism; D002469:Cell Separation; D005434:Flow Cytometry; D018793:Interleukin-13 / Q000276:immunology / Q000378:metabolism; D037181:Lectins, C-Type / Q000276:immunology / Q000378:metabolism; D008262:Macrophage Activation / Q000276:immunology; D008264:Macrophages / Q000276:immunology / Q000378:metabolism*; D000090323:Mannose Receptor; D037241:Mannose-Binding Lectins / Q000276:immunology / Q000378:metabolism; D008565:Membrane Proteins / Q000276:immunology / Q000378:metabolism*; D051379:Mice; D018345:Mice, Knockout; D009419:Nerve Tissue Proteins / Q000276:immunology / Q000378:metabolism*; D047495:PPAR gamma / Q000276:immunology / Q000378:metabolism*; D010587:Phagocytosis / Q000276:immunology; D017382:Reactive Oxygen Species / Q000276:immunology / Q000378:metabolism; D011956:Receptors, Cell Surface / Q000276:immunology / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015398:Signal Transduction / Q000276:immunology*; D000099181:Dectin-1
chemical_list: D018793:Interleukin-13; D037181:Lectins, C-Type; D000090323:Mannose Receptor; D037241:Mannose-Binding Lectins; D008565:Membrane Proteins; D009419:Nerve Tissue Proteins; D047495:PPAR gamma; D017382:Reactive Oxygen Species; D011956:Receptors, Cell Surface; D000099181:Dectin-1