4.6 Review

The intestinal immune system and gut barrier function in obesity and ageing

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Chronic Intestinal Inflammation Suppresses Brain Activity by Inducing Neuroinflammation in Mice

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Summary: Chronic gut inflammation, such as inflammatory bowel disease, may lead to reduced brain activity, decreased memory, and activation of neuroinflammatory signals, potentially caused by the transmission of HMGB1 from the intestine to the brain. Increased blood-brain barrier permeability may exacerbate inflammatory responses in the brain.

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Summary: The study identified that patients with relapsing remitting multiple sclerosis treated with dimethyl fumarate show a significant depletion of gut microbiota and potential neurotoxicity induced by phenol and indole derivatives of bacterial origin. The metabolites identified, such as p-cresol sulphate, indoxyl sulphate and N-phenylacetylglutamine, were associated with changes in neurofilament light chain levels and cortical volume in MRI measurements. This suggests that bacterial-derived metabolites from the breakdown of tryptophan and phenylalanine may play a role in mediating gut-brain communication and neurotoxicity in multiple sclerosis.
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Trimethylamine N-oxide promotes hyperlipidemia acute pancreatitis via inflammatory response

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Summary: This study found that TMAO promotes the occurrence of hyperlipidemia acute pancreatitis (HAP) by activating the TLR/p65 signaling pathway, while the choline analog 3,3-dimethyl-1-butanol (DMB) has a reversing effect on this process.

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Human gut bacteria produce TH17-modulating bile acid metabolites

Donggi Paik et al.

Summary: This study identifies bile acids produced by gut bacteria that inhibit the differentiation of T(H)17 cells, a key immune cell type involved in inflammatory disorders such as inflammatory bowel disease. The levels of these bile acids are reduced in patients with inflammatory bowel disease and are inversely correlated with the expression of T(H)17-cell-associated genes.

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Insulin resistance per se drives early and reversible dysbiosis-mediated gut barrier impairment and bactericidal dysfunction

Dalale Gueddouri et al.

Summary: This study demonstrates that acute insulin resistance and hyperglycemia induced by an insulin receptor antagonist in mice can lead to increased gut permeability without systemic inflammatory response. Additionally, this treatment results in gut dysbiosis and defects in gut barrier function, but discontinuation of the treatment can restore gut microbial balance and intestinal barrier integrity promptly.

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Intestinal intraepithelial lymphocytes: Maintainers of intestinal immune tolerance and regulators of intestinal immunity

Haitao Ma et al.

Summary: Intestinal immune tolerance is crucial for preventing abnormal immune responses to antigens from the gut, with IELs playing a significant role in maintaining this balance. Specific subgroups of IELs have the potential to regulate intestinal immunity and tolerance effectively.

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The gut microbiota-brain axis in behaviour and brain disorders

Livia H. Morais et al.

Summary: This Review discusses the intricate and potentially important connections between the gut microbiota and the brain, involving bidirectional communication along the gut-brain axis. Emerging evidence suggests that disruptions in microbial communities may be implicated in neurological disorders, with animal models providing valuable insights into the pathways linking the gut and the brain which could have tangible impacts on human health.

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A polyphenol-rich dietary pattern improves intestinal permeability, evaluated as serum zonulin levels, in older subjects: The MaPLE randomised controlled trial

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Summary: This study demonstrates that a polyphenol-rich diet can reduce serum zonulin levels, decrease blood pressure, and increase beneficial bacteria in the gut. These findings may open avenues for further research on dietary interventions for managing intestinal permeability, inflammation, and gut function in diverse populations.

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Stem-like intestinal Th17 cells give rise to pathogenic effector T cells during autoimmunity

Alexandra Schnell et al.

Summary: This study characterized the heterogeneity, plasticity, and migratory phenotypes of tissue Th17 cells in different states, revealing their roles in intestinal and central nervous system autoimmune inflammation. The research found that intestinal Th17 cells not only maintain tissue homeostasis but also directly contribute to the development of extra-intestinal autoimmune diseases.
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High-Fat Diet and Age-Dependent Effects of IgA-Bearing Cell Populations in the Small Intestinal Lamina Propria in Mice

Yuta Sakamoto et al.

Summary: This study investigated the impaired immune functions in diet-induced obese mice by evaluating the distribution of Igs in intestinal villi. Results showed a decrease in IgA, IgM, and IgG1 levels in the intestinal villi of mice fed a high-fat diet compared to those fed a standard diet, suggesting an impaired mucosal immune function due to diet-induced obesity.

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NAD+ metabolism and its roles in cellular processes during ageing

Anthony J. Covarrubias et al.

Summary: NAD(+) is a crucial coenzyme in redox reactions and plays a pivotal role in energy metabolism. Its levels decline with age, and raising NAD(+) levels is being explored as a potential strategy to extend human lifespan and healthspan. NAD(+) influences key cellular processes and functions, including metabolic pathways, DNA repair, and cellular senescence, with implications for healthy aging and age-related diseases.

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The cholesterol metabolite 25-hydroxycholesterol restrains the transcriptional regulator SREBP2 and limits intestinal IgA plasma cell differentiation

Bruno C. Trindade et al.

Summary: The cholesterol metabolite 25-hydroxycholesterol impacts intestinal B cell response by restricting plasma cell differentiation and promoting IgA secretion. The 25-HC-SREBP2 axis plays a crucial role in shaping the humoral response at the intestinal barrier, revealing insights into the effect of high dietary cholesterol on intestinal immunity.

IMMUNITY (2021)

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Role of gut microbiota in regulating gastrointestinal dysfunction and motor symptoms in a mouse model of Parkinson's disease.

Yogesh Bhattarai et al.

Summary: Parkinson's disease is a common neurodegenerative disorder associated with alterations in gut microbiota and epithelial barrier function. In a mouse model, chronic rotenone treatment resulted in changes in gut microbiota composition and increased intestinal permeability, exacerbating motor deficits.

GUT MICROBES (2021)

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Age-related cognitive decline is associated with microbiota-gut-brain axis disorders and neuroinflammation in mice

Mei-Ling Wu et al.

Summary: Age-related cognitive decline is associated with disruptions in the microbiota-gut-brain axis, resulting in deficits in learning and memory, neuronal and synaptic function, dysbiosis of gut microbiota, and increased inflammation in the brain in aged mice. These disruptions are linked to the activation of the TLR4/NF-κB signaling pathway by LPS, contributing to neuroinflammation and cognitive decline.

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Understanding the Connection Between the Gut-Brain Axis and Stress/Anxiety Disorders

Younjung Lee et al.

Summary: The microbiota-gut-brain axis involves a bidirectional relationship between the brain and gastrointestinal organs, with onset of anxiety disorders possibly correlated with this mechanism. There is a potential for using gastrointestinal system drugs such as probiotics and antibiotics as treatments for anxiety disorders. New strategies employing the microbiota-gut-brain axis mechanism are expected to be developed for not only anxiety disorders, but also other psychiatric diseases.

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Reduced immune-regulatory molecule expression on human colonic memory CD4 T cells in older adults

Stephanie M. Dillon et al.

Summary: The study found that older individuals had higher frequencies of colonic CD4 T cells, but lower expression of inhibitory markers such as CTLA-4 and PD-1. However, similar changes were not observed in CD4 T cells from peripheral blood in the same age group.

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Microbiota-Derived β-Amyloid-like Peptides Trigger Alzheimer's Disease-Related Pathways in the SH-SY5Y Neural Cell Line

Aitor Blanco-Miguez et al.

Summary: This study presents evidence of A beta-like peptides released from the gut microbiome, with one peptide inducing pathways related to Alzheimer's disease in neuron cell-line model. It opens new approaches for understanding the relationship between gut microbiota and AD, suggesting potential implications for targeted microbiota modification in animal models to study the role of gut bacteria in this progressive disease.

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Meta-analysis of the Parkinson's disease gut microbiome suggests alterations linked to intestinal inflammation

Stefano Romano et al.

Summary: Recent studies have shown significant alterations in the gut microbiome of Parkinson's disease patients compared to healthy individuals, which may result in a pro-inflammatory status and impact the symptoms and pathophysiology of the disease.

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Western diet induces Paneth cell defects through microbiome alterations and farnesoid X receptor and type I interferon activation

Ta-Chiang Liu et al.

Summary: Western diet can lead to dysfunction of Paneth cells and inhibit gut innate immunity. Obesity and high-fat diet may affect Paneth cells through microbiota and biological signaling pathways, contributing to diseases such as Crohn's disease.

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Food colorants metabolized by commensal bacteria promote colitis in mice with dysregulated expression of interleukin-23

Zhengxiang He et al.

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Dietary Regulation of Gut-Brain Axis in Alzheimer's Disease: Importance of Microbiota Metabolites

Dulce M. Frausto et al.

Summary: Alzheimer's disease is a global neurodegenerative disease that is influenced by genetics, environment, and lifestyle. Diet plays a crucial role as an environmental factor, affecting cognitive function and memory. Microbiota metabolites have been shown to impact brain function and the development of Alzheimer's disease.

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High-fat diet and dyslipidemia synergistically contribute to T cell senescence in gut associated lymphoid tissue

Yuchen Li et al.

Summary: Recent studies have linked obesity with systemic T cell senescence and thymus involution, but the influence of high-fat diet (HFD) and diet composition on premature T cell senescence remains unclear. This study showed that HFD components synergistically induce T cell senescence in the gut-associated lymphoid tissue (GALT) with dyslipidemia. The results demonstrated a shift from naive to effector-memory (EM) phenotype in T cells and up-regulation of PD1 and KLRG1 in DIO mice, highlighting the complex interplay of HFD, obesity, and intestinal immunity.

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A fiber-deprived diet causes cognitive impairment and hippocampal microglia-mediated synaptic loss through the gut microbiota and metabolites

Hongli Shi et al.

Summary: The study indicates that a diet lacking in fiber may lead to cognitive impairment, predominantly through altering the gut microbiota-hippocampal axis. These findings are crucial in highlighting the adverse effects of dietary fiber deficiency on brain function.

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The twilight of the immune system: The impact of immunosenescence in aging

Jack Feehan et al.

Summary: Cellular senescence is a critical part of human anti-tumor defence, but the accumulation of senescent cells with age can lead to various pathologies. Immunosenescence, the senescent change in immune cells, has a wide range of physiological effects and is partially responsible for many diseases associated with aging. Understanding the effects and mechanisms of immunosenescence can improve disease outcomes and prevention in older adults, and lead to new treatments for common illnesses.

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Article Multidisciplinary Sciences

Nicotinamide mononucleotide increases muscle insulin sensitivity in prediabetic women

Mihoko Yoshino et al.

Summary: The study demonstrates that NMN supplementation can enhance insulin sensitivity, insulin signaling, and remodeling in women with prediabetes who are overweight or obese, improving their metabolic function.

SCIENCE (2021)

Article Immunology

Preoperative Microbiomes and Intestinal Barrier Function Can Differentiate Prodromal Alzheimer's Disease From Normal Neurocognition in Elderly Patients Scheduled to Undergo Orthopedic Surgery

Mei Duan et al.

Summary: This study identified preoperative differences in intestinal microbiota (IM) and barrier function between pAD patients (SCD and aMCI) and NC patients. Dysbiosis and barrier dysfunction in the intestines of SCD and aMCI patients were observed, along with elevated plasma LPS and CRP in SCD patients.

FRONTIERS IN CELLULAR AND INFECTION MICROBIOLOGY (2021)

Review Neurosciences

The Contribution of Gut Microbiota-Brain Axis in the Development of Brain Disorders

Jessica Maiuolo et al.

Summary: This article explores the relationship between gut microbiota and neurological pathologies. Scientific studies have shown that the co-metabolism between microbiota and the host system is crucial for immune system organization, and that microbiota plays a significant role in the development, physiology, and cognitive functions of the brain. The alterations in gut microbiota have been closely associated with the onset of various neurological pathologies, suggesting that microbiota could be a valuable target for reducing or modulating the incidence of certain neurological diseases.

FRONTIERS IN NEUROSCIENCE (2021)

Article Immunology

Th17 Immunity in the Colon Is Controlled by Two Novel Subsets of Colon-Specific Mononuclear Phagocytes

Hsin-I. Huang et al.

Summary: Intestinal immunity is regulated by distinct mononuclear phagocyte populations, with colon-specific subsets of macrophages and Th17-inducing dendritic cells identified. These colon-specific cells express CD24 and CD14, and are dependent on the transcription factor IRF4. They play essential roles in Th17 immunity in the colon, demonstrating organ-specific requirements for antigen presenting cells in Th17 immunity in the colon and small intestine.

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A bacterial bile acid metabolite modulates Treg activity through the nuclear hormone receptor NR4A1

Wei Li et al.

Summary: Bile acids regulate immune balance by affecting T cell differentiation, with isoalloLCA promoting T-reg cell differentiation through chromatin structure changes; gut bacteria capable of producing isoalloLCA belong to common human gut bacterial phylum Bacteroidetes, and NR4A1 is essential for isoalloLCA's effects on T-reg cells; significantly reduced levels of isoalloLCA in patients with inflammatory bowel diseases suggest a critical role for isoalloLCA and its bacterial producers in maintaining immune homeostasis in humans.

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Erythritol Ameliorates Small Intestinal Inflammation Induced by High-Fat Diets and Improves Glucose Tolerance

Rena Kawano et al.

Summary: The study revealed that mice fed with water containing 5% erythritol under a high-fat diet had lower body weight, improved glucose tolerance, and higher energy expenditure. Furthermore, the erythritol group showed better outcomes in terms of liver fat deposition, adipocyte size, and intestinal inflammation compared to the control group.

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An integrin αEβ7-dependent mechanism of IgA transcytosis requires direct plasma cell contact with intestinal epithelium

Mauricio Guzman et al.

Summary: This study found that the deficiency of alpha E leads to a lack of luminal IgA in mice, despite normal immune cell recruitment and increased receptor expression. The researchers propose a new mechanism where a subset of plasma cells directly interacts with intestinal epithelium to transport IgA into the gut.

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Malnutrition in Older Adults-Recent Advances and Remaining Challenges

Kristina Norman et al.

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Serum and Fecal Markers of Intestinal Inflammation and Intestinal Barrier Permeability Are Elevated in Parkinson's Disease

Laura Dumitrescu et al.

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Prebiotic Inulin and Sodium Butyrate Attenuate Obesity-Induced Intestinal Barrier Dysfunction by Induction of Antimicrobial Peptides

Julia Beisner et al.

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Propionic Acid Rescues High-Fat Diet Enhanced Immunopathology in Autoimmunity via Effects on Th17 Responses

Stefanie Haase et al.

Summary: High-fat diets are linked to obesity and autoimmune diseases, with short-chain fatty acid propionate showing potential in counteracting the pro-inflammatory state induced by high-fat diets. By enhancing regulatory T cell functionality, propionate can prevent disease progression.

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Songwei Yang et al.

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Hippocampal Function Is Impaired by a Short-Term High-Fat Diet in Mice: Increased Blood-Brain Barrier Permeability and Neuroinflammation as Triggering Events

Gabriela Cristina de Paula et al.

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Peng Chen et al.

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