TNF as a mediator of metabolic inflammation and body-brain interaction in obesity-driven neuroinflammation and neurodegeneration

IF 12.4 1区 医学 Q1 CELL BIOLOGY
Chih Hung Lo , Jialiu Zeng
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引用次数: 0

Abstract

Body–brain interaction (BBI) plays a critical role in coordinating the communication between peripheral organs and the brain, contributing to the comorbidity of metabolic disorders and neurological disorders. In the context of obesity, one of the key mediators driving systemic and neuroinflammatory responses is the soluble form of tumor necrosis factor (TNF), which primarily signals through TNF receptor 1 (TNFR1) to regulate inflammation and cell death. In this review, we examine how TNF/TNFR1-mediated metabolic inflammation in obesity disrupts cellular homeostasis across multiple organ systems, including the brain. In peripheral tissues, TNF is overproduced and secreted by activated macrophages, leading to lipid dysmetabolism, insulin resistance, and metabolic dysfunction in key cell types such as adipocytes and hepatocytes. Elevated circulating TNF also increases the permeability of the blood–brain barrier, enabling peripheral inflammatory mediators to infiltrate the brain and activate glial cells, thereby amplifying neuroinflammation. Within the brain, TNF induces metabolic and autolysosomal dysfunction in neurons, resulting in elevated reactive oxygen species, accumulation of toxic protein aggregates, and impaired insulin signaling, contributing collectively to neuronal death and the progression of neurodegeneration. We further highlight the metabolic-inflammatory crosstalk within the BBI as a potential therapeutic target, focusing on anti-inflammatory strategies that modulate TNF/TNFR1 signaling. Lastly, we provide future perspectives on the implications of body–brain axes, cell type–specific mechanisms, and disease comorbidities in the context of obesity.
TNF在肥胖驱动的神经炎症和神经变性中作为代谢性炎症和体脑相互作用的中介
体脑相互作用(BBI)在协调外周器官和大脑之间的交流中起着关键作用,是代谢性疾病和神经系统疾病的合并症的重要组成部分。在肥胖的背景下,驱动全身和神经炎症反应的关键介质之一是可溶性形式的肿瘤坏死因子(TNF),其主要通过TNF受体1 (TNFR1)发出信号来调节炎症和细胞死亡。在这篇综述中,我们研究了肥胖中TNF/ tnfr1介导的代谢炎症如何破坏包括大脑在内的多个器官系统的细胞稳态。在外周组织中,TNF被活化的巨噬细胞过量产生和分泌,导致脂肪细胞和肝细胞等关键细胞类型的脂质代谢异常、胰岛素抵抗和代谢功能障碍。升高的循环TNF也增加了血脑屏障的通透性,使外周炎症介质浸润大脑并激活神经胶质细胞,从而放大神经炎症。在脑内,TNF诱导神经元代谢和自溶酶体功能障碍,导致活性氧升高,有毒蛋白聚集体积累,胰岛素信号受损,共同导致神经元死亡和神经退行性进展。我们进一步强调BBI内的代谢-炎症串扰作为潜在的治疗靶点,重点关注调节TNF/TNFR1信号的抗炎策略。最后,我们对肥胖背景下的体脑轴、细胞类型特异性机制和疾病合并症的含义提供了未来的观点。
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来源期刊
Ageing Research Reviews
Ageing Research Reviews 医学-老年医学
CiteScore
19.80
自引率
2.30%
发文量
216
审稿时长
55 days
期刊介绍: With the rise in average human life expectancy, the impact of ageing and age-related diseases on our society has become increasingly significant. Ageing research is now a focal point for numerous laboratories, encompassing leaders in genetics, molecular and cellular biology, biochemistry, and behavior. Ageing Research Reviews (ARR) serves as a cornerstone in this field, addressing emerging trends. ARR aims to fill a substantial gap by providing critical reviews and viewpoints on evolving discoveries concerning the mechanisms of ageing and age-related diseases. The rapid progress in understanding the mechanisms controlling cellular proliferation, differentiation, and survival is unveiling new insights into the regulation of ageing. From telomerase to stem cells, and from energy to oxyradical metabolism, we are witnessing an exciting era in the multidisciplinary field of ageing research. The journal explores the cellular and molecular foundations of interventions that extend lifespan, such as caloric restriction. It identifies the underpinnings of manipulations that extend lifespan, shedding light on novel approaches for preventing age-related diseases. ARR publishes articles on focused topics selected from the expansive field of ageing research, with a particular emphasis on the cellular and molecular mechanisms of the aging process. This includes age-related diseases like cancer, cardiovascular disease, diabetes, and neurodegenerative disorders. The journal also covers applications of basic ageing research to lifespan extension and disease prevention, offering a comprehensive platform for advancing our understanding of this critical field.
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