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Abstract
The protective effect and mechanism of low-intensity laser acupoint irradiation on focal cerebral ischemia-reperfusion (CIR) injury in rats were investigated. Male Sprague-Dawley rats were randomly divided into a sham group, a CIR model (model) group, and a model plus laser irradiation (laser) group. The focal CIR model was induced by middle cerebral artery occlusion in all except the rats in the sham group. After modeling, the Baihui, Mingmen, and left Zusanli points of the rats in the laser group were irradiated with 15 mW using a semiconductor laser, and each point was irradiated for 15 min once a day for 7 d. The treatments used in the sham and model groups were the same as in the laser group except that the laser output power was zero. After treatment, the expressions of serum superoxide dismutase (SOD) activity and serum malonaldehyde (MDA) content, the expression of growth-associated protein (GAP-43), the activities of succinic dehydrogenase and lactic dehydrogenase in brain tissue, were measured. The results showed that acupoint irradiation with a semiconductor laser can improve energy metabolism, enhance the expression of GAP-43, increase the levels of expression of serum SOD, and decrease the serum MDA content in a rat model of focal CIR, suggesting the mechanism for reduction of CIR injury.
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