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Objective
To observe the effects of electroacupuncture (EA) of three different frequencies (2 Hz, 80 Hz and 2 Hz/80 Hz) on the free radicals in hippocampus of vascular dementia (VD) model mice.Methods
A total of 100 Kunming mice were randomly divided into a sham operation group, a model group, a 2 Hz EA group, an 80 Hz EA group and a 2 Hz/80 Hz EA group, with 20 mice in each group. The ischemia-reperfusion VD model was established by repeated blockade of bilateral common carotid arteries. Mice in EA groups began EA treatment on the 4th day after the operation. Baihui (GV 20), Dazhui (GV 14), Geshu (BL 17) and Zusanli (ST 36) were punctured and then connected to EA instrument, with different waves of 2 Hz, 80 Hz or 2 Hz/80 Hz (10 min/time) applied accordingly, once a day. During the jumping stand experiment, the learning performance, memory performance and hippocampal calcitonin gene-related peptide (CGRP), nitric oxide synthase (NOS), malondialdehyde (MDA), changes in superoxide dismutase (SOD) and true choline esterase (TChE) were observed. In hippocampus, the CGRP level was determined by radioimmunoassay; the MDA level was determined by thiobarbituric acid colorimetric method; the activities of NOS and TChE were determined by spectrophotometry; the activity of SOD was determined by xanthine oxidase method.Results
Compared with the sham operation group, the performances of learning and memory decreased significantly in the model group (P<0.01); in hippocampus, the CGRP level decreased, the MDA level increased, the activities of NOS and TChE increased, and the activity of SOD decreased in the model group. Compared with the model group, the learning and memory performances of the EA groups were significantly improved (P<0.05 or P<0.01); in hippocampus, the CGRP level increased, the MDA level decreased, the NOS and TChE activities decreased, and the SOD activity increased (P<0.05 or P<0.01). Among EA groups, the 2 Hz/80 Hz EA group was superior to the 2 Hz EA group and the 80 Hz EA group (P<0.05 or P<0.01).Conclusion
EA can improve the cognitive impairment of mice with ischemia-reperfusion VD. The mechanism may be related to the improvement of cerebral blood circulation, regulation of the central neurotransmitters, fighting lipid peroxidation and promoting nerve cell repair. The therapeutic effects of EA with different frequencies were different, and the intervention effect by EA at 2 Hz/80Hz is the most significant.2.
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