Mechanisms of Electroacupuncture in Alleviating Visceral Hypersensitivity in Post-Infectious Irritable Bowel Syndrome Mice: The Role of GDNF Signaling Pathway and Gut Microbiota.

Irritable bowel syndrome (IBS) sometimes develops after a gut infection, causing painful digestive symptoms and increased sensitivity in the intestines. Researchers studied whether electroacupuncture—a type of acupuncture using mild electrical stimulation—could help reduce this intestinal pain in mice with post-infectious IBS. The study examined two important factors: the community of bacteria living in the gut (called the gut microbiome) and a protein called GDNF that affects nerve sensitivity. The researchers gave mice a chemical to trigger post-infection IBS symptoms, then measured their pain responses to intestinal stretching. They found that electroacupuncture treatment significantly improved the diversity and balance of gut bacteria while reducing intestinal pain sensitivity. Interestingly, when GDNF levels were high, it worsened the bacterial imbalance and increased pain. However, electroacupuncture appeared to work by regulating GDNF signaling, which helped restore healthy gut bacteria and decrease pain. This research suggests electroacupuncture may help IBS patients by improving the gut microbiome through specific biological pathways. The study adds to growing evidence that acupuncture affects not just pain signals but also the complex ecosystem of intestinal bacteria that influences digestive health. While this was an animal study and human research is needed, it provides insight into how acupuncture might relieve IBS symptoms at a biological level. If considering acupuncture for IBS, seek treatment from a licensed acupuncturist with experience in digestive disorders.

This animal study investigated electroacupuncture's mechanisms in post-infectious IBS using a TNBS-induced mouse model. Researchers assessed visceral hypersensitivity via abdominal withdrawal reflex to colorectal distention and profiled gut microbiota using 16S rRNA sequencing. Key findings demonstrated that EA treatment significantly increased gut microbiota richness and diversity while reducing interspecies variation and alleviating visceral hypersensitivity. The study identified GDNF signaling as a critical mediator: elevated GDNF exacerbated gut dysbiosis and increased visceral sensitivity compared to model controls, while EA appeared to modulate GDNF pathways to restore microbiome balance. This research establishes a mechanistic link between EA's effects on visceral pain and gut microbiota regulation through GDNF signaling pathways. Clinical implications suggest EA may benefit PI-IBS patients through microbiome modulation, though human trials are needed. The study provides biological plausibility for acupuncture's role in functional GI disorders beyond traditional neuromodulation theories.