Electroacupuncture Relieves Irritable Bowel Syndrome by Regulating IL-18 and Gut Microbial Dysbiosis in a Trinitrobenzene Sulfonic Acid-Induced Post-Inflammatory Animal Model.

Irritable bowel syndrome (IBS) affects millions of people, causing abdominal pain, bloating, and unpredictable bowel movements. Post-inflammatory IBS (PI-IBS) develops after an intestinal infection and is particularly challenging to treat. Researchers investigated whether electroacupuncture—a form of acupuncture that uses mild electrical stimulation—could help relieve PI-IBS symptoms in rats.

The study used rats with chemically-induced intestinal inflammation that mimics PI-IBS in humans. Researchers applied electroacupuncture to two specific acupuncture points on the abdomen and leg (ST25 and ST36), which are traditionally used in Chinese medicine for digestive problems. They measured pain responses, analyzed gut bacteria, and examined inflammation markers in the intestinal tissue.

The results were promising. Rats receiving electroacupuncture showed significantly reduced sensitivity to abdominal pain compared to untreated animals. The treatment also restored healthier gut bacteria populations—the untreated rats had elevated levels of harmful bacteria and reduced beneficial Lactobacillus, while electroacupuncture helped reverse these changes. Additionally, the treatment reduced levels of IL-18, an inflammatory protein that was elevated in the IBS model.

These findings suggest that electroacupuncture may work through multiple mechanisms: reducing inflammation, restoring healthy gut bacteria balance, and decreasing pain sensitivity. While this was an animal study and human trials are needed, the results support what many practitioners and patients have observed clinically. For people with PI-IBS who haven't found relief with conventional treatments, electroacupuncture may offer a promising complementary approach. If considering acupuncture for digestive issues, seek treatment from a licensed acupuncturist with experience in gastrointestinal conditions.

This study investigated electroacupuncture effects on visceral hypersensitivity in a TNBS-induced PI-IBS rat model. EA was applied to ST25 and ST36 acupoints, with visceral sensitivity assessed via abdominal withdrawal reflex scores at various colorectal distention pressures. 16S rRNA sequencing revealed significant gut dysbiosis in model rats, with increased pathogenic genera (Empedobacter, Psychrobacter, Enterococcus, Fusobacterium) and decreased Lactobacillus compared to controls. EA treatment significantly reduced visceral hypersensitivity, decreased Fusobacteria phylum abundance, and normalized microbiome composition. Quantitative PCR and western blot analysis demonstrated elevated IL-18 mRNA and protein expression in colonic tissue of model rats, which was significantly attenuated by EA treatment. The study demonstrates EA's therapeutic mechanism involves modulation of inflammatory cytokines and restoration of gut microbiota homeostasis. Clinical implications suggest EA at ST25/ST36 may provide effective treatment for PI-IBS through anti-inflammatory and microbiome-modulating pathways, particularly for patients with elevated inflammatory markers.