Effect of electro-acupuncture therapy on limb spasm and excitability of motor neurons in stroke rats.

Abstract

To investigate the effect of electro-acupuncture therapy on limb spasm and excitability of motor neurons in stroke rats. Ischemic stroke model was induced with middle cerebral artery embolization in SD rats. Thirty-three modeled rats were randomly divided into model group, electro-acupuncture group, and baclofen group with 11 rats in each group, and another 10 rats were taken as sham operation group. The electro-acupuncture group and the baclofen group were treated with electro-acupuncture and baclofen tablets respectively. The model group and the sham operation group had no intervention. The neural function was evaluated with Bederson's scale and balance beam test; the muscle tension was measured with electrophysiography; the pathological changes of brain tissue was examined with HE staining; the content of glutamic acid (Glu) and γ-aminobutyric acid (GABA) in rat cerebral cortex was analyze with enzyme linked immunosorbent assay (ELISA) method, the expression of metabotropic glutamate receptor 1a () and γ-aminobutyric acid type B receptor subunit 1 () mRNA were detected with RT-qPCR. Compared with the model group, the neurological function scores of the electro-acupuncture group and the baclofen group showed a downward trend at d7 after operation (all >0.05), and the neurological function scores of the electro-acupuncture group and the baclofen group were significantly decreased at d12 after the operation (all <0.05). Compared with sham operation group, the electrophysiological results of model group, electro-acupuncture group and baclofen group were significantly lower (all <0.05), and there was no statistical difference in the electrophysiological results of the model group, electro-acupuncture group and baclofen group at d7 after operation (all >0.05). Compared with the model group, the electrophysiological results of the electro-acupuncture group and baclofen group were significantly increased after operation (all <0.05). The results of HE staining showed that there was no cell edema and degeneration in the sham operation group, no pyknosis of the nucleus, and no bleeding in the interstitium. Cell edema and degeneration and mesenchymal congestion appeared in the model group. Compared with the model group, the cytoplasmic edema and degeneration and the interstitial bleeding in the electroacupuncture group and the baclofen group were reduced. Compared with sham operation group, the Glu content and the relative expression of mRNA was increased in the model group, electro-acupuncture group and baclofen group, while the GABA content and the relative expression of mRNA decreased (all <0.05). Compared with model group, the Glu content and the relative expression of mRNA in the electro-acupuncture group and baclofen group decreased, and the GABA content and relative expression of mRNA increased (all <0.05). Electro-acupuncture may improve limb spasm after stroke through regulating the expression of Glu and GABA in the cerebral cortex and the excitability of motor neurons in rats.