过氧化物酶体增殖物激活受体γ与固有免疫系统介导炎症消退。

PPARγ and the Innate Immune System Mediate the Resolution of Inflammation.

作者信息

Croasdell Amanda, Duffney Parker F, Kim Nina, Lacy Shannon H, Sime Patricia J, Phipps Richard P

机构信息

Department of Environmental Medicine, University of Rochester School of Medicine and Dentistry, 601 Elmwood Avenue, Rochester, NY 14642, USA ; Lung Biology and Disease Program, University of Rochester School of Medicine and Dentistry, 601 Elmwood Avenue, Rochester, NY 14642, USA.

Department of Environmental Medicine, University of Rochester School of Medicine and Dentistry, 601 Elmwood Avenue, Rochester, NY 14642, USA ; Lung Biology and Disease Program, University of Rochester School of Medicine and Dentistry, 601 Elmwood Avenue, Rochester, NY 14642, USA ; Department of Medicine, University of Rochester School of Medicine and Dentistry, 601 Elmwood Avenue, Rochester, NY 14642, USA.

出版信息

PPAR Res. 2015;2015:549691. doi: 10.1155/2015/549691. Epub 2015 Dec 2.

Abstract

The resolution of inflammation is an active and dynamic process, mediated in large part by the innate immune system. Resolution represents not only an increase in anti-inflammatory actions, but also a paradigm shift in immune cell function to restore homeostasis. PPARγ, a ligand activated transcription factor, has long been studied for its anti-inflammatory actions, but an emerging body of literature is investigating the role of PPARγ and its ligands (including thiazolidinediones, prostaglandins, and oleanolic acids) in all phases of resolution. PPARγ can shift production from pro- to anti-inflammatory mediators by neutrophils, platelets, and macrophages. PPARγ and its ligands further modulate platelet and neutrophil function, decreasing trafficking, promoting neutrophil apoptosis, and preventing platelet-leukocyte interactions. PPARγ alters macrophage trafficking, increases efferocytosis and phagocytosis, and promotes alternative M2 macrophage activation. There are also roles for this receptor in the adaptive immune response, particularly regarding B cells. These effects contribute towards the attenuation of multiple disease states, including COPD, colitis, Alzheimer's disease, and obesity in animal models. Finally, novel specialized proresolving mediators-eicosanoids with critical roles in resolution-may act through PPARγ modulation to promote resolution, providing another exciting area of therapeutic potential for this receptor.

摘要

炎症的消退是一个活跃且动态的过程,在很大程度上由固有免疫系统介导。消退不仅代表抗炎作用的增强,还意味着免疫细胞功能发生范式转变以恢复体内平衡。PPARγ是一种配体激活的转录因子,长期以来一直因其抗炎作用而受到研究,但越来越多的文献正在探究PPARγ及其配体(包括噻唑烷二酮类、前列腺素和齐墩果酸)在消退各阶段中的作用。PPARγ可使中性粒细胞、血小板和巨噬细胞的促炎介质生成转变为抗炎介质生成。PPARγ及其配体进一步调节血小板和中性粒细胞功能,减少其迁移,促进中性粒细胞凋亡,并防止血小板与白细胞相互作用。PPARγ改变巨噬细胞迁移,增加胞葬作用和吞噬作用,并促进替代性M2巨噬细胞活化。该受体在适应性免疫反应中也发挥作用,尤其是在B细胞方面。这些作用有助于减轻多种疾病状态,包括动物模型中的慢性阻塞性肺疾病、结肠炎、阿尔茨海默病和肥胖症。最后,新型的在消退中起关键作用的特殊促消退介质——类二十烷酸,可能通过PPARγ调节发挥作用以促进消退,为该受体提供了另一个令人兴奋的治疗潜力领域。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bf95/4680113/c9e12ba4fd0e/PPAR2015-549691.001.jpg

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