{"title":"TNF as a mediator of metabolic inflammation and body-brain interaction in obesity-driven neuroinflammation and neurodegeneration","authors":"Chih Hung Lo , Jialiu Zeng","doi":"10.1016/j.arr.2025.102891","DOIUrl":null,"url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":55545,"journal":{"name":"Ageing Research Reviews","volume":"112 ","pages":"Article 102891"},"PeriodicalIF":12.4000,"publicationDate":"2025-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Ageing Research Reviews","FirstCategoryId":"3","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1568163725002375","RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CELL BIOLOGY","Score":null,"Total":0}
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.
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.