OBJECTIVE

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To study the improvement effects and mechanisms of Tujia medicine musk needle therapy on cognitive dysfunction in ischemic stroke model rats.

METHODS

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Totally 44 rats were randomly divided into sham operation group， model group， musk needle treatment group and ordinary acupuncture group， with 11 rats in each group. Except for the sham operation group， ischemic stroke model was induced by modified suture method in other groups. After modeling， musk needle treatment group and the ordinary acupuncture group were treated with Tujia musk needle （containing 3 mg of artificial musk） and traditional filiform needle respectively to intervene in the muscle layer of the contralateral scalp motor area， with an intervention duration of 3 courses. The sham operation group and model group were not given any treatment. The neurological deficits score in rats were recorded and Morris water maze behavioral tests were conducted. The morphology of neurons in the cortical area of rats was observed， and the expression of DCX/BrdU and NeuN/BrdU co-labeled cells in the ischemic subependymal area was observed. The plasma levels of hypoxia-inducible factor-1α （HIF-1α） and vascular endothelial growth factor（VEGF） in rats were tested.

RESULTS

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Compared with sham operation group， neurological deficit score of model group was increased significantly， escape latency prolonged significantly， and the times of crossing platform significantly reduced （

P

＜0.05）； the neuronal structure was significantly damaged， and the number of surrounding Nissl bodies decreased； the number of DCX/BrdU and NeuN/BrdU co-labeled cells in the ischemic subependymal area were significantly increased （

P

＜0.05）； the levels of HIF-1α and VEGF in plasma were significantly increased （

P

＜0.05）. Compared with model group， neurological deficits score， escape latency， the times of crossing platform were all reversed significantly in musk needle treatment group and ordinary acupuncture group （

P

＜0.05）； the neuronal structure was improved， and the number of Nissl bodies increased； the number of DCX/BrdU and NeuN/BrdU co-labeled cells in the ischemic subependymal area were significantly increased （

P

＜0.05）； the plasma levels of HIF-1α and VEGF were significantly increased （

P

＜0.05）. Compared with ordinary acupuncture group， the plasma level of HIF-1α was reduced （the difference was not statistically significant）， while the level of VEGF was significantly increased （

P

＜0.05）.

CONCLUSIONS

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Tujia medicine musk needle therapy can significantly improve the cognitive dysfunction in ischemic stroke model rats， and its mechanism of action may be associated with promoting migration and differentiation of neural stem cell in ischemic subependymal area， preventing the excessive release of HIF-1α and increasing the expression of VEGF.