炎症
小RNA
过敏性炎症
免疫学
白细胞介素13
细胞因子
体内
医学
生物
白细胞介素4
基因
生物化学
生物技术
作者
Manish Kumar,Tanveer Ahmad,Amit Sharma,Ulaganathan Mabalirajan,Ankur Kulshreshtha,Anurag Agrawal,Balaram Ghosh
标识
DOI:10.1016/j.jaci.2011.04.034
摘要
BackgroundIL-13, a cytokine secreted by TH2 lymphocytes and other cells, critically modulates allergic inflammation and tissue remodeling in allergic asthma. Although much is known about transcriptional regulation of IL-13, posttranscriptional regulation is poorly understood.ObjectiveBecause many inflammatory pathways are known to be regulated by microRNAs, permitting a rapid and fine-tuned response, the role of microRNA-mediated regulation of IL-13 was investigated using both in vitro and in vivo studies.MethodsA combination of in silico approaches and in vitro transfections in A549 cells and primary cultured T cells was used to demonstrate the involvement of let-7 in IL-13 regulation. Furthermore, intranasal delivery of let-7 microRNA mimic in mice was performed to study its effects in allergic airway inflammatory conditions.ResultsUsing a combination of bioinformatics and molecular approaches, we demonstrate that the let-7 family of microRNAs regulates IL-13 expression. Induced levels of IL-13 in cultured T cells were inversely related to let-7 levels. In an IL-13–dependent murine model of allergic airway inflammation, we observed that inflammation was associated with a reduction in most of the members of the let-7 family. Exogenous administration of let-7 mimic to lungs of mice with allergic inflammation resulted in a decrease in IL-13 levels, resolution of airway inflammation, reduction in airway hyperresponsiveness, and attenuation of mucus metaplasia and subepithelial fibrosis.ConclusionLet-7 microRNAs inhibit IL-13 expression and represent a major regulatory mechanism for modulating IL-13 secretion in IL-13–producing cell types and thereby TH2 inflammation. IL-13, a cytokine secreted by TH2 lymphocytes and other cells, critically modulates allergic inflammation and tissue remodeling in allergic asthma. Although much is known about transcriptional regulation of IL-13, posttranscriptional regulation is poorly understood. Because many inflammatory pathways are known to be regulated by microRNAs, permitting a rapid and fine-tuned response, the role of microRNA-mediated regulation of IL-13 was investigated using both in vitro and in vivo studies. A combination of in silico approaches and in vitro transfections in A549 cells and primary cultured T cells was used to demonstrate the involvement of let-7 in IL-13 regulation. Furthermore, intranasal delivery of let-7 microRNA mimic in mice was performed to study its effects in allergic airway inflammatory conditions. Using a combination of bioinformatics and molecular approaches, we demonstrate that the let-7 family of microRNAs regulates IL-13 expression. Induced levels of IL-13 in cultured T cells were inversely related to let-7 levels. In an IL-13–dependent murine model of allergic airway inflammation, we observed that inflammation was associated with a reduction in most of the members of the let-7 family. Exogenous administration of let-7 mimic to lungs of mice with allergic inflammation resulted in a decrease in IL-13 levels, resolution of airway inflammation, reduction in airway hyperresponsiveness, and attenuation of mucus metaplasia and subepithelial fibrosis. Let-7 microRNAs inhibit IL-13 expression and represent a major regulatory mechanism for modulating IL-13 secretion in IL-13–producing cell types and thereby TH2 inflammation.
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