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Objective: To observe the effect of electroacupuncture (EA) stimulation on the expression of c-Jun terminal kinase(JNK)signaling pathway-related proteins in the hippocampus of vascular dementia (VD) rats, so as to explore its mechanisms underlying improvement of VD., Methods: Male Sprague-Dawley rats were randomly divided into sham operation, model and EA groups ( n ＝10 rats per group). The VD model was prepared by repeated occlusion of the bilateral common carotid arteries for 10 min and reperfusion for 10 min (3 times in total). The rats in the EA group received EA (2 Hz, 2 mA) at "Dazhui"(GV14)，"Baihui"(GV20), and bilateral "Housanli"(ST36) ，"Geshu"(BL17) for 10 min, once daily for 14 days. The learning-memory abi-lity was detected by Morris water maze tests, the distribution of hippocampal neurons detected by Nissl staining, and the apoptosis of hippocampal neurons detected by using TdT-mediated dUTP nick-end labeling (TUNEL) method. The expressions of JNK, phosphorylated JNK (p-JNK), cysteine-containing aspartate-specific proteases-8 (Caspase-8) and Caspase-3 proteins were detected by Western blot., Results: After modeling and compared with the sham operation group, the escape latency was significantly prolonged ( P <0.01) and the number of safe-platform quadrant crossing obviously decreased ( P <0.01), suggesting a reduction of learning-memory ability. The number of hippocampal neurons was considerably reduced ( P <0.01), and that of hippocampal apoptotic neurons remarkably increased in the model group ( P <0.01). Whereas, the expression levels of hippocampal apoptosis-related proteins as JNK, p-JNK, Caspase-8 and Caspase-3, as well as the apoptotic index were significantly up-regulated ( P <0.01). Following EA intervention, the learning-memory ability was apparently improved ( P <0.01), and the number of hippocampal neurons was considerably increased ( P <0.01), the hippocampal apoptotic cell number, apoptosis index and the expression levels of JNK, p-JNK, Caspase-8 and Caspase-3 were significantly down-regulated ( P <0.01)., Conclusion: EA intervention can improve the learning-memory ability of VD rats, which may be associated with its effects in reducing hippocampal apoptosis by suppressing JNK signaling pathway.

Objective: To observe the influence of electroacupuncture (EA) intervention on hippocampal glutamate (Glu) and Ca 2+ contents, and expression of Glu-N-methyl-D-aspartic acid receptor(NMDAR) and the learning-memory ability in vascular dementia (VD) rats, so as to reveal its mechanisms underlying improvement of VD., Methods: SD rats were rando-mized into sham operation (sham) group ( n =9), model group ( n =11) and EA groups ( n =10). The VD model was established by repeated bilateral common carotid arteries occlusion and reperfusion plus intraperitoneal injection of sodium nitroprusside. EA (2 Hz, 2 mA) was applied to "Baihui" (GV 20)-"Housanli" (ST 36) and "Geshu" (BL 17)-"Dazhui" (GV 14) for 10 min, once a day for 15 consecutive days. The neurological function was assessed by using stroke index (0-10 points) and neurological deficit scaling(0-10 points). The learning-memory ability was evaluated by using step-down tests. The contents of Glu and Ca 2+ in the right hippocampal tissue were determined by using aspectrophotometer and the expression of NMDAR protein in the right hippocampus was detected by immunoblotting., Results: Compared with the sham group, the stroke index and neurological deficit scores, and the reaction latency and the error times of step-down tests, as well as the contents of Glu and Ca 2+ and the expression level of NMDAR in the right hippocampus were significantly increased in the model group ( P <0.05, P <0.01), while the step-through latency was considerably decreased ( P <0.01), suggesting a neurological disorder and a cognitive decline. After EA intervention, the reaction latency and error times of step-down tests, the contents of Glu and Ca 2+ and the expression level of NMDAR in the right hippocampus were significantly down-regulated, and the step-through latency was notably increased in comparison with the model group ( P <0.01)., Conclusions: EA intervention is able to improve the cognitive ability of VD rats, which may be associated with its effects in reducing the excitatory neurotoxicity of hippocampal Glu-NMDAR and lowering cellular Ca 2+ load to resist neuronal injury.

Objective: To observe the effect of electrocupuncture (EA) intervention at different time-points of post-modeling on behavior and hippocampal monoamine neurotransmitter noradrenalin (NE), dopamine (DA) and 5-hydroxytrypamine (5-HT) contents in vascular dementia (VD) mice, so as to study its mechanism underlying improvement of VD., Methods: A total of 60 Kunming mice were randomized into sham-operation control (n = 20), VD model (n = 20), EA-day (D)-1 (EA treatment was given from the 1st day on after modeling, n = 10), EA-D-3 (EA was given from the 3rd day on after modeling, n = 10) groups. VD model was established by occlusion of the bilateral cervical common arteries and reperfusion. EA (2 Hz/80 Hz) was applied to "Baihui" (GV 20), "Dazhui" (GV 14),"Zusanli" (ST 36) and "Geshu"(BL 17) for 10 min, once daily for 15 days. Hippocampal NE, DA and 5-HT contents were assayed by fluorospectrophotometry. The mouse's learning-memory ability was assessed by step-down tests., Results: In comparison with the sham-operation control group, the learning-memory ability (marked increase of reaction time and error times, decrease of step-down latency) was apparently lowered in the model group (P < 0.01). The hippocampal NE, DA and 5-HT contents were significantly lower in the model group than in the sham-operation group (P < 0.01). Compared with the model group, the mice's learning-memory ability (marked decrease of reaction time and error times, increase of step-down latency) was significantly increased in EA intervention groups (P < 0.01), and hippocampal NE, DA and 5-HT levels were significantly increased (P < 0.01), and the effect of EA-D-3 group was obviously better than that of the EA-D-1 group (P < 0.05, P < 0.01)., Conclusion: EA can improve the VD mice's learning-memory ability, which is closely related to its effects in up-regulating hippocampal NE, DA and 5-HT contents, and the effect of later EA intervention after modeling is better.

Objective: To investigate the influence of electroacupuncture (EA) on lipid metabolism in both sexes of obesity model rats., Methods: A total of 30 male and 30 female SD rats were randomized into normal control, model and EA groups respectively, with 10 rats in each group. EA (2 Hz, 1-2 mA) was applied to the ipsilateral "Zusanli" (ST 36)-"Sanyin-jiao"(SP 6) and bilateral "Fenglong" (ST 40) for 30 min, once daily for 28 days. In addition,"Quchi" (LI 11),"Zhongwan" (CV 12) and "Guanyuan" (CV 4) were punctured with filiform needles and stimulated by manipulating the needle for 1 min, separately. Obesity model was duplicated by subcutaneous injection of 15% glutamic sodium (0.2 mL/10 g) once daily for 5 days and by feeding the animal with high fat forage for 36 days. Lee's index was calculated, and plasma triglyeride (TG) concentration detected by glycerol-phosphoric acid oxidase-peroxydase method, total cholesterol (TC) detected by cholesterol oxidase method, and plasma low-density lipoprotein-cholesterol (LDL-C) and high-density lipoprotein-cholesterol (HDL-C) contents were assayed by one-step method, respectively., Results: In both male and female rats, compared to their own normal groups, the Lee's index, plasma TG, TC and LDL-C contents were increased significantly and plasma HDL-C contents decreased obviously in the model groups (P<0.01), while compared to their own model groups, the Lee's index, plasma TG, TC and LDL-C levels in the EA groups were down-regulated considerably and plasma HDL-C contents up-regulated remarkably after the treatment (P<0.01, P<0.05). The efficacies of the EA intervention were obviously better in reducing Lee's index for male rats, and in down-regulating plasma TG and TC contents in female rats (P<0.05). No significant differences were found between male and female rats in EA intervention for plasma LDL-C and HDL-C levels., Conclusion: EA intervention can effectively regulate obesity rats' Lee's index and plasma TG, TC, LDL-C and HDL-C levels. The effects are different in male and female rats.

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