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Ischemic stroke causes motor dysfunction and disability that significantly impact recovery and quality of life. Current rehabilitation approaches have limited efficacy. Recent research has focused on understanding how electroacupuncture activates specific neural circuits that regulate motor control and promote brain plasticity.
This study investigated the precise mechanisms by which electroacupuncture at two key acupoints improves motor function following stroke through the somatostatin neural circuit.
Study Overview
In this study, researchers created an ischemic stroke model in Sprague-Dawley rats by blocking and then reopening the left middle cerebral artery. Rats were assigned to control or electroacupuncture treatment groups receiving stimulation at Quchi (LI 11) and Zusanli (ST 36) for 14 consecutive days.
To identify specific neural mechanisms, researchers used optogenetic stimulation – targeted light-based activation of specific nerve fibers – on subsets of rats both alone and combined with electroacupuncture. Assessments included measurements of brain infarct volume, neurological deficit severity scores (movement, sensation, reflexes, balance), motor function using gait analysis and rotarod performance, and analysis of GABAergic (inhibitory) neural circuits and synaptic proteins in the brain.
Key Findings
Electroacupuncture significantly reduced infarct volume and neurological deficits compared to untreated stroke controls, improving motor function on gait and balance tests. At the cellular level, electroacupuncture increased GABA production and transport proteins while decreasing GABA receptor expression, indicating enhanced GABAergic circuit function. Three subtypes of GABAergic interneurons reduced in the stroke model were significantly restored after electroacupuncture.
Optogenetic stimulation of the cortex-striatum somatostatin circuit produced similar benefits to electroacupuncture alone, with further enhancement when combined. Electroacupuncture also increased synaptic plasticity proteins, suggesting brain reorganization underlies motor recovery.
Clinical Relevance for Acupuncture Practitioners
Electroacupuncture at LI 11 and ST 36 produces neurorestorative effects by activating the somatostatin neural circuit, a key pathway regulating motor control. The findings support integration of these distal acupoints into post-stroke rehabilitation, with potential enhancement when combined with scalp acupuncture over affected motor regions. Combining distal and local points offers practitioners an evidence-based approach to optimize motor recovery.
Conclusion
Electroacupuncture at Quchi (LI 11) and Zusanli (ST 36) effectively restored motor function following stroke in this animal model by activating the somatostatin neural circuit and enhancing synaptic plasticity. These promising findings provide a foundation for further clinical investigation into electroacupuncture’s potential role in post-stroke rehabilitation and support the rationale for its integration into comprehensive recovery protocols.
Reference
- Zheng Y, Wang W, Xia S, et al. Effect of electro-acupuncture on motor dysfunction in middle cerebral artery occlusion/reperfusion rats though cortex-striatum somatostatin neural circuit. Neurosci, 9 Sept 2025;585:262–278. Free full text available at https://tinyurl.com/ev47u5e9.
