Boya Wang

Intestinal homeostasis requires immune tolerance, barrier integrity, tissue repair, and microbiota mutualism. Interleukin-10 (IL-10) is essential, but not merely as an immunosuppressant. Although IL-10 signals via the IL-10R—JAK1/TYK2—STAT3 axis, its outputs are cell-type and context dependent. In macrophages, IL-10 restrains IL-23 production, inflammasome activation, IL-1β release, and metabolic reprogramming. In T cells, it limits pathogenic T helper 17 cell (Th17) responses while stabilizing regulatory cells and promoting metabolically driven IL-10 production. In the epithelium, IL-10 maintains barrier integrity by limiting apoptosis, endoplasmic reticulum (ER) stress, and mucus defects. IL-10 and the gut microbiota engage in reciprocal regulation: microbial metabolites and structural components enhance IL-10 production and receptor responsiveness, whereas IL-10 signaling preserves microbial diversity and ecological resilience. This may help to explain why systemic recombinant IL-10 failed in Crohn’s disease (CD)—increasing ligand abundance alone is unlikely to recapitulate endogenous localization or restore refractory target cells. Emerging strategies aim to tune IL-10 signaling through gut-selective delivery, engineered cytokines, conditionally activated prodrugs, regulatory cell approaches, and microbiome or metabolic interventions. Clinical translation requires biomarkers of IL-10R expression, STAT3 responsiveness, macrophage metabolic state, microbial signatures, and acquired IL-10 hyporesponsiveness. Despite the established role of IL-10 in intestinal homeostasis, systemic IL-10 therapy has failed in clinical trials, and there is a lack of effective strategies to restore IL-10 signaling in a spatially and cell-specific manner. The spatially organized, metabolically conditioned homeostatic IL-10 signaling—largely inferred from model systems and awaiting direct spatial validation in human intestine—offers a roadmap for more precise therapy in inflammatory bowel disease and related intestinal disorders.

Hua L, et al. J Gastric Cancer. 2026 ;26:e27. https://doi.org/10.5230/jgc.2026.26.e27

Mast cells have vital functions in allergic responses and parasite ejection, while the underlying mechanisms remain unclear. Meanwhile, MCs are essential for the maintenance of GI barrier function, and their interactions with neurons, immune cells, and epithelial cells have been related to various gastrointestinal (GI) disorders. An increasing number of investigations are being disclosed, with a lack of inner connections among them. This review aims to highlight their properties and categorization and further delve into their participation in GI diseases via interplay with neurons and immune cells. We also discuss their roles in diseases like inflammatory bowel disease (IBD) and irritable bowel syndrome (IBS). Based on the evidence, we advocated for their potential application in clinical practices and advocated future research prospects.

(1) Background: Depression is the most prevalent psychiatric symptom present among individuals of all ages and backgrounds, impacting an estimated 300 million people globally. Therefore, it demands a significant amount of attention when it comes to managing depression. A growing amount of data reveal that probiotics and fatty acids could be beneficial to depression. However, the opposing position maintains that they have no influence on depression. A network meta-analyses of existing datasets aid in the estimation of comparative efficacy as well as in achieving an understanding of the relative merits of different therapies. The purpose of this study was to investigate the current evidence for probiotic or fatty acid depression therapy and to establish a practical alternative for depression patients using a meta-analysis and metagenomic data from a Wistar–Kyoto (WKY) depressed rat model. (2) Methods: Probiotic data were obtained from seven randomized controlled trial studies (n = 394), and fatty acid data were obtained from 24 randomized controlled trial studies (n = 1876). Meanwhile, a metagenomics analysis of data on animal gut flora was also applied to validate the preceding evidence. (3) Results: The fatty acid studies were separated into three sections based on the duration of probiotic delivery: ≤8 weeks, 9–12 weeks, and >12 weeks. The results were as follows: for ≤8 weeks, MD = −1.65 (95% CI: −2.96–−0.15), p = 0.01; for 9–12 weeks, MD = −2.22 (95% CI: −3.03–−1.22), p < 0.001; for >12 weeks, MD = −1.23 (95% CI: −2.85–0.39), p = 0.14. Regarding the probiotics, the meta-analysis revealed MD = −2.19 (95% CI: −3.38–−2.43), p < 0.001. The research presented herein illustrates that probiotics and fatty acids may successfully lower depression scores. Additionally, the probiotics were drastically reduced in the WKY rats. (4) Conclusions: According to the data, a depression intervention utilizing probiotics outperformed the control, implying that the use of probiotics and fatty acids may be a successful strategy for depression treatment.

The gut microbiota is the most abundant and diverse microbiota in the human body and the vagus nerve is the most widely distributed and complex nerve in the body, both of them are essential in maintaining homeostasis. The most important phenomenon is how they coordinate to regulate functions, which has attracted the great attention of scientists. The academic literature on the correlation with a host of intestinal diseases and even systemic diseases has revealed the bidirectional communication between the gut microbiota and the brain, which can be carried out via multiple patterns. In the review, firstly, we have a general overview of the gut microbiota and the gut microbiota-brain axis. Secondly, according to the distribution characteristics of the vagus nerve, we analyzed and summarized its function in the intestinal tract. At the same time, we have summarized the underlying mechanism of some behavior changes such as depressive and anxiety-like behaviors and related neurodegenerative diseases caused by the vagus nerve and intestinal microecological environment disorders, and then we also analyzed inconsistency of the experimental evidence in order to propose novel strategies for the clinical practice.

Background Although constipation is a common syndrome and a worldwide health problem. Constipation patients are becoming younger with a 29.6% overall prevalence in the children, which has captured great attention because of its epigenetic rejuvenation and recurrent episodes. Despite the usage of rhubarb to relieve constipation, novel targets and genes involved in target-relevant pathways with remarkable functionalities should still be sought after. Materials and methods We established a reliable constipation model in C57B/6N male mice using intragastric administration diphenoxylate and the eligible subjects received 600mg/25g rhubarb extraction to ameliorate constipation. Resultant constipation was morphological and genetically compared with the specimen from different groups. Results The constipation mice exhibited thicker muscle layers, improved content of cytokines, including IL-17 and IL-23, and lower content of IL-22. The bacterial abundance and diversity varied tremendously. Notably, the alterations were reversed after rhubarb treatment. Additionally, SCFA and MLCFA were significantly influenced by constipation accompanied by enhanced expressions of SCFA receptors, GPR41 and GPR43. Conclusion This thesis has provided an insight that rhubarb promoted the flexibility of collagen fiber, reduced pro-inflammatory cytokines and enhanced anti-inflammatory cytokines, and maintained intestinal microflora balance with potential effects on affecting the metabolism of fatty acids and polyamines.

Purpose: Hypertension (HTN) is a major risk factor for cardiovascular disease. In recent years, there were numerous studies on the function of stress in HTN. However, the gut dysbiosis linked to hypertension in animal models under stress is still incompletely understood. Purpose of this study is to use multiple determination method to determine the juvenile stage intestinal bacteria, cytokines and changes in hormone levels. Methods: Four groups of juvenile male spontaneously hypertensive rats (SHRs) and age-matched male Wistar-Kyoto (WKY) rats were randomly selected as control and experimental groups. Rats in the two stress groups were exposed to restraint stress for 3 hours per day for 7 consecutive days. In one day three times in the method of non-invasive type tail-cuff monitoring blood pressure. The detailed mechanism was illuminated based on the intestinal change using immunohistochemical and immunofluorescence staining and the stress-related hormone and inflammation factors were analyzed via ELISA method. The integrity of the epithelial barrier was assessed using FITC/HRP and the expression levels of proteins associated with the tight junction was detected by Western blot. The alteration of stress-related intestinal flora from ileocecal junction and distal colon were also analyzed using its 16S rDNA sequencing. Results: The results indicate that acute stress rapidly increases mean arterial pressure which is positive correlation to hormone concentration, especially in SHR-stress group. Meanwhile, stress promoted the enhancement of epithelial permeability accompanied with a reduced expression of the tight junction-related protein and the macrophages (M&phis;) aggregation to the lamina propria. There were remarkable significant increase of stress-related hormones and pro-inflammatory factor interleukin (IL)-6 along with a decrease in the diversity of intestinal flora and an imbalance in the F/B ratio. Conclusion: Our results reveal that stress accompanied with HTN could significantly disrupt the domino effect between intestinal flora and homeostasis.

As the main player in humoral immunity, antibodies play indispensable roles in the body’s immune system. Plasma cells (PCs), as antibody factories, are important contributors to humoral immunity. PCs, recognized by their unique marker CD138, are always discovered in the medullary cords of spleen and lymph nodes and in bone marrow and mucosal lymphoid tissue. This article will review the origin and differentiation of PCs, characteristics of short- and long-lived PCs, and the secretion of antibodies, such as IgA, IgM, and IgG. PCs play a crucial role in the maintenance of intestinal homeostasis using immunomodulation though complex mechanisms. Clearly, PCs play functional roles in maintaining intestinal health, but more details are needed to fully understand all the other effects of intestinal PCs.