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Immunological Model of sphingolipids with IL-6/IL-17/IL-23 in L. major infection

ABSTRACT: In diseased state, we demonstrated that increase in production of sphingosine-1-phosphate and overexpression of IL-6,lL-17 and IL-23 with SATB1 leads to disease progression.

SUBMITTER: Shailza Singh

PROVIDER: MODEL2301110001 | BioModels | 2023-01-11

REPOSITORIES: BioModels

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Publications

Decoding systems immunological model of sphingolipids with IL-6/IL-17/IL-23 axes in L. major infection.

Jawale Diksha D Khandibharad Shweta S Singh Shailza S

Biochimica et biophysica acta. Molecular and cell biology of lipids 20221207 2

IL-6, IL-17, IL-23 and IL-1β are the crucial cytokines controlling inflammatory and immune response during L. major infection. During cutaneous leishmaniasis, an important T helper cell type CD4<sup>+</sup> Th17 subset plays a deterministic role in lesion formation through channelling infected macrophages and production of IL-1β, IL-6, IL-23 and IFN-γ. Ceramide derived sphingosine precursors may assist in pro-inflammatory cytokine response. However, the role of these metabolites in inflammation ...[more]

PMID: 36494028

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Immunological Healthy State Model of Sphingolipids with IL-6/IL-17/IL-23 immune axis in L.major infection

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2020-03-25 | PXD016633 | Pride

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Project description:Background & Aims: The IL-23/IL-17 axis plays an important role in the pathogenesis of autoimmune diseases and the pathological consequences of infection. We previously showed that immunopathologic mechanisms mediated by inflammatory monocytes underlie the severe focal liver damage induced by the protozoan parasite, Entamoeba histolytica. Here, we analyze the contribution of the IL-23/IL-17 axis to the induction and subsequent recovery from parasite-induced liver damage. Methods: IL-23p19-/-, IL-17A/F-/-, CCR2-/-, and WT mice were intra-hepatically infected with E. histolytica trophozoites and disease onset and recovery were analyzed by magnetic resonance imaging. The expression of liver-specific genes and proteins during infection was examined by qPCR, microarray, FACS analysis and immunohistochemistry. Immuno-depletion and substitution experiments were performed in IL-23p19-/- and WT mice to investigate the role of IL-13 in disease outcome. Results: Liver damage in infected IL-23p19-/-, IL-17A/F-/-, CCR2-/- mice was strongly attenuated compared with that in WT mice. IL-23p19-/- mice showed reduced expression of IL-17 and CCL2 genes and proteins. Increased numbers of IL-13-producing CD11b+Ly6Clo regenerative monocytes were associated with disease attenuation in IL-23p19-/- mice. Immuno-depletion of IL-13 in IL-23-/- mice reversed this attenuation and treatment of infected WT mice with an IL-13/anti-IL-13-mAb complex supported liver recovery. Conclusions: The IL-23/IL-17 axis plays a critical role in the immunopathology of hepatic amebiasis. IL- 13 secreted by CD11b+Ly6Clo monocytes supports recovery from liver damage. An IL-13/anti-IL13- mAb complex mimics this function, suggesting a novel therapeutic option to support tissue healing after liver damage.

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NFAT-dependent IL-2 and IL-23 produced by DC are key regulators of pathogenic TH17-mediated lung inflammation

Project description:Calcineurin/NFAT/IL-2 signaling pathway is activated in dendritic cells (DC) upon encounter of β glucan, the main component of the fungal cell wall, raising the question about the role of NFAT-regulated genes in DC biology in vivo. To directly assess the function of IL-2 secreted by DC, we analyzed mice lacking of IL-2 in the DC lineage, CD4-expressing cells and with complete deletion of IL-2 in the germ line in a mouse model of pulmonary fungal infection. Here we found that specifically the loss of IL-2 in DC resulted in increased mice mortality upon the fungus Aspergillus fumigatus challenge and expansion of Th17 cells in the lung. We demonstrated that only CD103+DC were able to release IL-2 in acute phase of pulmonary Aspergillosis through the Ca2+-Calcineurin-NFAT signaling. We also found that NFAT mediates IL-23 transcription in lung DC, where IL-2 results essential in restraining the priming of a pathogenic infiltrating IL-17+Sca1+CD90+CD4+ cell with stem cell like properties. Thus, IL-2 and IL-23 secreted by DC in the lung have an antagonistic relationship on the Th17 differentiation program with IL-2 inducing T cell differentiation and IL-23 inducing a stem cell like molecular signature to Th17 cells upon Aspergillus challenge. DC-Il2-/- then confer the Th17 stemness, releasing IL-23 in response to the fungus contributing to the development of a Th17 cell effector population, particularly pathogenic in infection.

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