Deletion of PPARγ in lung macrophages provides an immunoprotective response against M. tuberculosis infection in mice.

Deletion of PPARγ in lung macrophages provides an immunoprotective response against M. tuberculosis infection in mice.
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肺巨噬细胞中PPARγ的缺失提供了针对小鼠结核分枝杆菌感染的免疫保护反应。

DOI:
10.1016/j.tube.2018.06.012
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发表时间:
2018-07
期刊:
Tuberculosis (Edinburgh, Scotland)
影响因子:
--
通讯作者:
Schlesinger LS
Schlesinger LS
中科院分区:
其他
文献类型:
--
作者:
Guirado E;Rajaram MV;Chawla A;Daigle J;La Perle KM;Arnett E;Turner J;Schlesinger LS

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过氧化物酶体增殖物激活受体γ(Peroxisome proliferator-activated receptor gamma,PPARγ)是一种核转录因子,属于配体激活核受体超家族。它被多种内源性脂质代谢物以及外源性配体如噻唑烷二酮类激活。其活性调节细胞代谢、增殖、分化和炎症,后者部分通过促炎细胞因子的反式抑制。PPARγ在交替活化的肺泡巨噬细胞(AM)中高度表达,AM是空气传播的结核分枝杆菌(M.tb)的主要宿主细胞。我们先前的体外研究确定了通过人巨噬细胞上的甘露糖受体(CD 206)激活PPARγ在使结核分枝杆菌生长中的重要性。本研究的目的是使用巨噬细胞特异性PPARγ基因敲除小鼠模型,特别强调肺环境,研究PPARγ在结核分枝杆菌感染过程中的体内作用。我们的数据表明,肺巨噬细胞中不存在PPARγ可减少毒性结核分枝杆菌的生长,增强促炎细胞因子并减少肉芽肿浸润。这些发现表明,PPARγ激活,下调巨噬细胞促炎反应,影响肺对结核分枝杆菌感染的反应,从而支持PPARγ在结核病(TB)发病机制中的作用。
Peroxisome proliferator-activated receptor gamma (PPARγ) is a nuclear transcription factor belonging to the superfamily of ligand-activated nuclear receptors. It is activated by diverse endogenous lipid metabolites as well as by exogenous ligands such as the thiazolidinediones. Its activity regulates cellular metabolism, proliferation, differentiation, and inflammation, the latter in part through trans-repression of pro-inflammatory cytokines. PPARγ is highly expressed in alternatively activated alveolar macrophages (AMs), a primary host cell for airborne Mycobacterium tuberculosis (M.tb). Our previous in vitro study identified the importance of PPARγ activation through the mannose receptor (CD206) on human macrophages in enabling M.tb growth. The aim of the current study was to investigate the role of PPARγ in vivo during M.tb infection using a macrophage-specific PPARγ knock out mouse model with special emphasis on the lung environment. Our data show that the absence of PPARγ in lung macrophages reduces the growth of virulent M.tb, enhances pro-inflammatory cytokines and reduces granulomatous infiltration. These findings demonstrate that PPARγ activation, which down-regulates macrophage pro-inflammatory responses, impacts the lung’s response to M.tb infection, thereby supporting PPARγ’s role in tuberculosis (TB) pathogenesis.
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