Understanding the Relationship Between Vascular Smooth Muscle Cell Function and the Efficacy of Acupuncture in Treating Cerebral Ischemic Stroke: A Preclinical Meta-Analysis and Systematic Review.

Background: Cerebral blood flow and vascular structures serve as the fundamental components of brain metabolism and circulation. Acupuncture, an alternative and complementary medical approach, has demonstrated efficacy in treating cerebral ischemic stroke (CIS). Nevertheless, the mechanisms underlying the impact of acupuncture on vascular smooth muscle cell (VSMC) function remain uncertain. The objective of this systematic review and meta-analysis is to assess the alterations in VSMC function following acupuncture stimulation in CIS models. Methods: The databases PubMed, Web of Science, SCOPUS, and EMBASE were queried until November 2022 using a predetermined search strategy. The FORMAT BY SYRCLE guidelines were adhered to, and the risk of bias of the included studies was evaluated using the Risk of Bias tool developed by the Systematic Review Centre for Laboratory Animal Experimentation. The random-effects model was employed to estimate the standardized mean difference (SMD). Results: Eighteen articles are included in this review. Acupuncture showed significant positive effects on the region cerebral blood flow (SMD=8.15 [95% CI, 4.52 to 11.78]) and neurological deficiency (SMD=-3.75 [95% CI, -5.54 to -1.97]). Descriptive analysis showed a probable mechanism of acupuncture stimulation in CIS rats related to VSMC function. Limitations and publication bias were presented in the studies. Conclusion: In this systematic review and meta-analysis, our findings indicate that acupuncture stimulation has the potential to improve regional cerebral blood flow and alleviate neurological deficits, possibly by regulating VSMC function. However, it is important to exercise caution when interpreting these results due to the limitations of animal experimental design and methodological quality.

[Electroacupuncture improves learning-memory ability in diabetic rats with cognitive impairment via inhabitating proinflammatory cytokine production through p38 MAPK and STAT3 pathway].

OBJECTIVE: To investigate the effect of electroacupuncture (EA) on the p38 mitogen-activated protein kinase (p38 MAPK) and signal transducer and activator of transcription 3 (STAT3) pathway in hippocampus and frontal cortex of diabetic rats with cognitive impairment (CI), as well as the mechanism of EA in protection against CI in diabetic rats. METHODS: Thirty SD rats were divided into normal, model and EA groups (n=10 rats/group). The diabetic model was established by i.p.injection of Streptozotocin solution(25 mg/kg), followed by high-fat diet raising for 1 month, and the CI rats was confirmed by Morris water maze tasks. The rats in the EA group were given acupuncture at "Zusanli" (ST36) "Neiting" (ST44) and "Yishu" (EX-B3) 20 min/d, among which ST36 and ST44 were treated with EA. The treatment was conducted 6 times a week for 4 weeks. The fasting blood glucose (FBG) contents were assayed by glucometer before and after treatment. The rats' learning-memory ability was detected by Morris water maze tasks. The expression levels of IL-6、IL-1ß、TNF-α、p38 MAPK、p-p38 MAPK、STAT3 and p-STAT3 in hippocampus and frontal cortex were detected by Western blot and quantitative real-time PCR, separately. The mean fluorescence intensity of p38 MAPK and STAT3 was observed by immunofluorescence histochemistry. RESULTS: After modeling, FBG and the escape latency of Morris water maze tasks were significantly increased in the model group compared with the normal group (P<0.001, P<0.01). Following EA treatment, the increased FBG and average escape latency were markedly reversed in the EA group relevant to the model group (P<0.05). Compared with the normal group, the proteins and mRNAs expression of IL-6, IL-1ß, TNF-α, p38 MAPK, p-p38 MAPK, STAT3 and p-STAT3 in hippocampus and frontal cortex were significantly increased in the model group (P<0.001), as well as the mean fluorescence intensity of p38 MAPK and STAT3 in hippocampus and frontal cortex (P<0.001). Following EA intervention, the proteins and mRNAs expression of IL-6, IL-1ß, TNF-α, p38 MAPK, p-p38 MAPK, STAT3 and p-STAT3, and the mean fluorescence intensity of p38 MAPK and STAT3 in hippocampus and frontal cortex were down-regulated(P<0.001, P<0.05). CONCLUSION: EA can inhibit the over production of pro-inflammatory cytokines in diabetic rats with CI, possibly by regulating the expression of p38 MAPK and STAT3 pathway.

Regulation of the endoplasmic reticulum stress response and neuroprotective effects of acupuncture on brain injury caused by heroin addiction.

OBJECTIVES: To evaluate regulation of the endoplasmic reticulum stress (ERS) response by acupuncture and to investigate its neuroprotective effect on brain injury caused by heroin addiction. METHODS: A total of 48 male Sprague-Dawley rats were randomly divided into a healthy control group (Control), an untreated heroin exposed group (Heroin) and a heroin exposed group receiving electroacupuncture (EA) treatment at GV14 and GV20 (Heroin+acupuncture) with n=16 rats per group. A rat model of heroin addiction was established by intramuscular injection of incremental doses of heroin for 8 consecutive days. A rat model of heroin relapse was established according to the exposure (addiction) → detoxification method. Apoptotic changes in nerve cells in the hippocampus and ventral tegmental area (VTA) were evaluated in each group of rats using terminal deoxynucleotidyl transferase dUTP nick end labelling (TUNEL) assay. PERK, eIF2a, CHOP, IRE1 and JNK gene expression and protein expression were measured using quantitative real-time PCR (RT-qPCR) assay and immunohistochemical assay, respectively. RESULTS: The total number of positive nerve cells in the hippocampus and VTA was significantly lower in the Heroin+acupuncture group than in the Heroin group (p<0.01). Compared with the Heroin group, mRNA and protein expression of PERK, eIF2a, CHOP, IRE1 and JNK in the hippocampus and VTA were significantly downregulated in the Heroin+acupuncture group (p<0.05). CONCLUSION: The acupuncture-regulated ERS response appears to mediate the neuroprotective effect of acupuncture in heroin-addicted rats with brain injury. Inhibition of CHOP and JNK upregulation and reduction of nerve cell apoptosis may be the main mechanisms underlying the effects of acupuncture on heroin addiction-induced brain injury.

Acupuncture regulates the unfolded protein response and inhibits apoptosis in a rat model of heroin relapse.

OBJECT: To explore the unfolded protein response (UPR) in the hippocampus of rats undergoing heroin relapse and the mechanisms underlying the acupuncture-mediated inhibition of brain damage caused by heroin relapse. METHODS: 60 Sprague-Dawley rats (30 females and 30 males) were randomly divided into four groups: Control group, Heroin group, Heroin+acupuncture group, and Heroin+methadone group (n=15 each). In the latter three groups, a model of heroin addiction was established by successive increments of intramuscular heroin injections for 8 days, according to the exposure (addiction)→detoxification method. A UPR RT2 Profiler PCR array was used to screen for differentially expressed genes in the hippocampus. Apoptosis was detected by terminal deoxynucleotidyl transferase dUTP nick end labelling (TUNEL) staining. The protein expression levels of the following three differentially expressed genes were detected by Western blot to validate the results of the PCR array: heat shock protein (HSP)70, HSP105, and valosin-containing protein (Vcp). RESULTS: The UPR RT2 Profiler PCR Array detection results indicated that acupuncture increased the expression levels of the molecular chaperones HSP70, HSP105, and Vcp. The degree of neuronal apoptosis in the hippocampus of rats in the Heroin+acupuncture and Heroin+methadone groups was significantly reduced compared with the untreated Heroin group (p<0.01). Protein expression of HSP70, HSP105, and Vcp in the Heroin+acupuncture and Heroin+methadone groups was significantly higher than the Heroin group (p<0.01). CONCLUSIONS: The positive effects of acupuncture on brain damage caused by heroin may be closely related to up-regulation of HSP70, HSP105, and Vcp, and reduced apoptosis.