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cGAS-STING 信号通路在肠道稳态和疾病中的作用。

cGAS-STING signaling pathway in intestinal homeostasis and diseases.

机构信息

Department of Gastroenterology and Hepatology, University of Groningen, University Medical Center Groningen, Groningen, Netherlands.

Department of Medical Microbiology and Infection Prevention, University of Groningen, University Medical Center Groningen, Groningen, Netherlands.

出版信息

Front Immunol. 2023 Sep 14;14:1239142. doi: 10.3389/fimmu.2023.1239142. eCollection 2023.

Abstract

The intestinal mucosa is constantly exposed to commensal microbes, opportunistic pathogens, toxins, luminal components and other environmental stimuli. The intestinal mucosa consists of multiple differentiated cellular and extracellular components that form a critical barrier, but is also equipped for efficient absorption of nutrients. Combination of genetic susceptibility and environmental factors are known as critical components involved in the pathogenesis of intestinal diseases. The innate immune system plays a critical role in the recognition and elimination of potential threats by detecting pathogen-associated molecular patterns (PAMPs) and damage-associated molecular patterns (DAMPs). This host defense is facilitated by pattern recognition receptors (PRRs), in which the cyclic GMP-AMP synthase-stimulator of interferon genes (cGAS-STING) pathway has gained attention due to its role in sensing host and foreign double-stranded DNA (dsDNA) as well as cyclic dinucleotides (CDNs) produced by bacteria. Upon binding with dsDNA, cGAS converts ATP and GTP to cyclic GMP-AMP (cGAMP), which binds to STING and activates TANK binding kinase 1 (TBK1) and interferon regulatory factor 3 (IRF3), inducing type I interferon (IFN) and nuclear factor kappa B (NF-κB)-mediated pro-inflammatory cytokines, which have diverse effects on innate and adaptive immune cells and intestinal epithelial cells (IECs). However, opposite perspectives exist regarding the role of the cGAS-STING pathway in different intestinal diseases. Activation of cGAS-STING signaling is associated with worse clinical outcomes in inflammation-associated diseases, while it also plays a critical role in protection against tumorigenesis and certain infections. Therefore, understanding the context-dependent mechanisms of the cGAS-STING pathway in the physiopathology of the intestinal mucosa is crucial for developing therapeutic strategies targeting the cGAS-STING pathway. This review aims to provide insight into recent findings of the protective and detrimental roles of the cGAS-STING pathway in intestinal diseases.

摘要

肠黏膜不断暴露于共生微生物、机会性病原体、毒素、腔内容物和其他环境刺激物中。肠黏膜由多种分化的细胞和细胞外成分组成,形成一个关键的屏障,但也具备高效吸收营养物质的能力。遗传易感性和环境因素的结合被认为是参与肠道疾病发病机制的关键因素。先天免疫系统在识别和消除潜在威胁方面起着至关重要的作用,它通过检测病原体相关分子模式(PAMPs)和损伤相关分子模式(DAMPs)来实现。这种宿主防御是通过模式识别受体(PRRs)来实现的,其中环鸟苷酸-腺苷酸合酶-干扰素基因刺激物(cGAS-STING)途径由于其在识别宿主和外来双链 DNA(dsDNA)以及细菌产生的环二核苷酸(CDNs)方面的作用而受到关注。cGAS 与 dsDNA 结合后,将 ATP 和 GTP 转化为环鸟苷酸-腺苷酸(cGAMP),与 STING 结合并激活 TANK 结合激酶 1(TBK1)和干扰素调节因子 3(IRF3),诱导 I 型干扰素(IFN)和核因子 kappa B(NF-κB)介导的促炎细胞因子,这些细胞因子对先天和适应性免疫细胞和肠上皮细胞(IECs)有多种影响。然而,cGAS-STING 途径在不同的肠道疾病中的作用存在相反的观点。cGAS-STING 信号的激活与炎症相关疾病的临床预后恶化有关,而它在肿瘤发生和某些感染的保护中也起着关键作用。因此,了解 cGAS-STING 途径在肠黏膜生理病理学中的上下文相关机制对于开发针对 cGAS-STING 途径的治疗策略至关重要。本综述旨在提供对 cGAS-STING 途径在肠道疾病中保护和有害作用的最新发现的深入了解。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/732e/10538549/e7fdc2afb821/fimmu-14-1239142-g001.jpg

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