One of the most common challenges TCM practitioners face is the question, usually politely worded, sometimes not, of how acupuncture works. For a long time, the honest answer involved a lot of “we know it does, but the mechanism isn’t fully mapped yet.”
That answer is becoming less and less true.
A comprehensive review published in Acupuncture Research by researchers from Fudan University and the China Academy of Chinese Medical Sciences has produced what may be the most detailed mechanistic picture of acupuncture to date; one that reframes the practice not as a localized intervention or a placebo effect, but as a form of programmable neuromodulation acting through defined neural circuits.
The Circuit Map
The review synthesizes recent experimental evidence to trace exactly what happens from needle to response. Mechanical stimulation at an acupoint is transduced into neural signals through mechanosensitive receptors and connective tissue interactions. Those signals activate sensory neurons in the dorsal root and trigeminal ganglia, which relay to the spinal cord and brainstem. From there, the central nervous system engages autonomic outputs; vagal, sympathetic, and hypothalamic-pituitary-adrenal pathways, to produce coordinated immune regulation across multiple organs simultaneously.
Locally, acupuncture remodels the immune microenvironment through controlled neurogenic inflammation, increased blood flow, and coordinated activity among sensory nerves, mast cells, and fibroblasts. Systemically, vagus nerve-dependent anti-inflammatory pathways suppress excessive inflammatory responses. The enteric nervous system is also involved, acupuncture strengthens gut barrier integrity and modulates microbiota-neuropeptide interactions to influence whole-body immunity.
One of the more clinically relevant findings is that stimulus parameters; intensity, frequency, and depth to determine which neural circuits are engaged. This explains something practitioners observe but has been hard to articulate to sceptics: acupuncture’s effects are bidirectional and context-dependent because the inputs are specific and the circuits they activate are specific.
Why This Matters for Our Profession
This research does something important beyond advancing mechanistic understanding. It provides a translation layer between TCM’s traditional framework and the language modern medicine demands. Concepts like treating the root, regulating the whole, and addressing the relationship between systems rather than isolated symptoms; these are not poetic metaphors. They describe, in their own language, exactly what this circuit-based model is now demonstrating in neurobiological terms.
For practitioners in Ontario working to establish TCM’s place in interprofessional care settings, this kind of research is significant. It is harder to dismiss a modality as non-scientific when researchers at Fudan University can point to a “mechanical stimulation–neural coding–immune response” framework that maps the full pathway from needling to systemic immune regulation. The authors themselves note that this mechanistic clarity supports integrating acupuncture into modern treatment paradigms for inflammatory and immune-related diseases.
The science is not just validating what we do. It is giving us better language to explain it.
Source: Tian et al., “Acupuncture effects and neuro-immune regulation,” Acupuncture Research, 2025. EurekAlert summary published April 22, 2026.

