학술논문
TPL-2 Regulates Macrophage Lipid Metabolism and M2 Differentiation to Control T.sub.H2-Mediated Immunopathology
Research Article
Research Article
Document Type
Author abstract
Author
Source
PLoS Pathogens. August 3, 2016, Vol. 12 Issue 8, e1005783
Subject
Language
English
ISSN
1553-7366
Abstract
Author(s): Yashaswini Kannan 1, Jimena Perez-Lloret 1, Yanda Li 1, Lewis J. Entwistle 1, Hania Khoury 2, Stamatia Papoutsopoulou 3, Radma Mahmood 4, Nuha R. Mansour 5, Stanley Ching-Cheng Huang [...]
Persistent T.sub.H 2 cytokine responses following chronic helminth infections can often lead to the development of tissue pathology and fibrotic scarring. Despite a good understanding of the cellular mechanisms involved in fibrogenesis, there are very few therapeutic options available, highlighting a significant medical need and gap in our understanding of the molecular mechanisms of T.sub.H 2-mediated immunopathology. In this study, we found that the Map3 kinase, TPL-2 (Map3k8; Cot) regulated T.sub.H 2-mediated intestinal, hepatic and pulmonary immunopathology following Schistosoma mansoni infection or S. mansoni egg injection. Elevated inflammation, T.sub.H 2 cell responses and exacerbated fibrosis in Map3k8.sup.-/- mice was observed in mice with myeloid cell-specific (LysM) deletion of Map3k8, but not CD4 cell-specific deletion of Map3k8, indicating that TPL-2 regulated myeloid cell function to limit T.sub.H 2-mediated immunopathology. Transcriptional and metabolic assays of Map3k8.sup.-/- M2 macrophages identified that TPL-2 was required for lipolysis, M2 macrophage activation and the expression of a variety of genes involved in immuno-regulatory and pro-fibrotic pathways. Taken together this study identified that TPL-2 regulated T.sub.H 2-mediated inflammation by supporting lipolysis and M2 macrophage activation, preventing T.sub.H 2 cell expansion and downstream immunopathology and fibrosis.
Persistent T.sub.H 2 cytokine responses following chronic helminth infections can often lead to the development of tissue pathology and fibrotic scarring. Despite a good understanding of the cellular mechanisms involved in fibrogenesis, there are very few therapeutic options available, highlighting a significant medical need and gap in our understanding of the molecular mechanisms of T.sub.H 2-mediated immunopathology. In this study, we found that the Map3 kinase, TPL-2 (Map3k8; Cot) regulated T.sub.H 2-mediated intestinal, hepatic and pulmonary immunopathology following Schistosoma mansoni infection or S. mansoni egg injection. Elevated inflammation, T.sub.H 2 cell responses and exacerbated fibrosis in Map3k8.sup.-/- mice was observed in mice with myeloid cell-specific (LysM) deletion of Map3k8, but not CD4 cell-specific deletion of Map3k8, indicating that TPL-2 regulated myeloid cell function to limit T.sub.H 2-mediated immunopathology. Transcriptional and metabolic assays of Map3k8.sup.-/- M2 macrophages identified that TPL-2 was required for lipolysis, M2 macrophage activation and the expression of a variety of genes involved in immuno-regulatory and pro-fibrotic pathways. Taken together this study identified that TPL-2 regulated T.sub.H 2-mediated inflammation by supporting lipolysis and M2 macrophage activation, preventing T.sub.H 2 cell expansion and downstream immunopathology and fibrosis.