The central mechanisms of electroacupuncture at LR3 in the treatment of spontaneous hypertension: a PET and mRNA transcriptome study

Objective

To reveal the efficacy and potential mechanisms of electroacupuncture (EA) in treating hypertension.

Methods

Male spontaneously hypertensive rats (SHRs) were randomly assigned to the SHR group, EA group, and Sham-EA group, with Wistar-Kyoto rats (WKY) as the normal control group. SHRs in the EA group received electroacupuncture at the bilateral Taichong (LR3) acupoints for 7 consecutive days. Evaluation of systolic blood pressure (SBP), diastolic blood pressure (DBP), mean arterial pressure (MAP), and heart rate (HR) was conducted. Positron emission tomography-computed tomography (PET-CT) was employed to explore the active brain regions associated with acupuncture-induced blood pressure reduction. Furthermore, mRNA expression profiling was analyzed in the active brain regions to identify differentially expressed genes, and quantitative polymerase chain reaction (qPCR) was used to validate the mRNA expression of differentially expressed genes in the active brain region.

Results

EA reduced elevated SBP, DBP, MAP and HR in SHR. PET-CT revealed that EA decreased glucose metabolism in the hypothalamus. Genomic analysis suggested that, compared to the SHR group, the differentially expressed genes in the hypothalamus of the EA group included Nr4a1, Sirt1, Trh, GPR88, Cck, and Th. EA downregulated the mRNA expression of Th, Trh, Gpr88, and Nr4a1, while upregulating the expression of Sirt1 and Cck at the mRNA level.

Conclusion

EA may exert a unique antihypertensive effect in the hypothalamus of SHR, involving the modulation of sympathetic nerve activity, neuroinflammation, and oxidative stress response.

Clinical Spectrum and Trajectory of Innovative Therapeutic Interventions for Insomnia: A Perspective

Increasing incidences of insomnia in adults, as well as the aging population, have been reported for their negative impact on the quality of life. Insomnia episodes may be associated with neurocognitive, musculoskeletal, cardiovascular, gastrointestinal, renal, hepatic, and metabolic disorders. Epidemiological evidence also revealed the association of insomnia with oncologic and asthmatic complications, which has been indicated as bidirectional. Two therapeutic approaches including cognitive behavioral therapy (CBT) and drugs-based therapies are being practiced for a long time. However, the adverse events associated with drugs limit their wide and long-term application. Further, Traditional Chinese medicine, acupressure, and pulsed magnetic field therapy may also provide therapeutic relief. Notably, the recently introduced cryotherapy has been demonstrated as a potential candidate for insomnia which could reduce pain, by suppressing oxidative stress and inflammation. It seems that the synergistic therapeutic approach of cryotherapy and the above-mentioned approaches might offer promising prospects to further improve efficacy and safety. Considering these facts, this perspective presents a comprehensive summary of recent advances in pathological aetiologies of insomnia including COVID-19, and its therapeutic management with a greater emphasis on cryotherapy.

PET-CT and RNA sequencing reveal novel targets for acupuncture-induced lowering of blood pressure in spontaneously hypertensive rats

Manual acupuncture (MA) can be used to manage high blood pressure; however, the underlying molecular mechanism remains unknown. To explore the mechanism of acupuncture in the treatment of hypertension, Wistar Kyoto rats (WKYs) and spontaneously hypertensive rats (SHRs) were subjected to either MA stimulation or the corresponding sham procedure as a negative control (Sham-MA) for 1 week. PET-CT scans, transcriptomics and molecular biology were used to evaluate the effect of MA. The results show that MA can regulate blood pressure in SHRs, change the glucose metabolism of the paraventricular hypothalamus (PVH), and affect the mRNA and protein expression levels of differentially expressed genes in the PVH. These genes may lower blood pressure by regulating angiotensin, endothelial function and inflammation. These findings reveal that MA regulates multiple biological processes and genes/proteins of the PVH, and provide a solid theoretical basis for exploring the mechanisms by which MA regulates hypertension.

Targeted Metabolic Profiling and PRM Analysis of Proteins Revealed Impaired Polyunsaturated Fatty Acid Metabolism and GTP Metabolism in the Brainstem of Spontaneously Hypertensive Rats

An untargeted multi-omics study implicated the potential dysregulation of fatty acid, nucleotide, and energy metabolism in the brainstems of spontaneously hypertensive rats (SHRs). A further quantitative exploration of the alterations in the metabolic pathways is necessary for a deep understanding of the central nervous system in SHRs. Targeted metabolic profiling of 40 fatty acids (PeptideAtlas: PASS01671) and 32 metabolites of nucleotides and energy metabolism (PeptideAtlas: PASS01672) and parallel reaction monitoring analysis of 5 proteins (PeptideAtlas: PASS01673) were performed on the brainstems of SHRs (n = 8, 11 weeks old) and normotensive Wistar rats (n = 8, age-matched) using gas chromatography-mass spectrometry (GC-MS) and liquid chromatography-tandem MS. The targeted profiling results of metabolites and proteins revealed decreased polyunsaturated fatty acid (PUFA) synthesis with a significant downregulation of cis-11,14-eicosadienoic acid, cis-13,16-docosadienoic acid, and docosatetraenoate and impaired PUFA oxidation with the accumulation of γ-linolenate induced by the significantly downregulated expression of 2,4-dienoyl-CoA reductase (p < 0.05). Dysregulated GTP and ATP metabolism was observed, with significantly decreased GDP and ADP (p < 0.05) correlated with reduced GTPases of guanine nucleotide-binding protein subunit beta-1 (GNB1), transforming protein RhoA (RHOA), and Rho-related GTP-binding protein RhoB (RHOB) in the brainstem of SHRs. In addition, protein-arginine deiminase type-2 was significantly reduced in the brainstems of SHRs (p < 0.05). The aberrant PUFA and energy metabolism might help to explain the alterations in the brainstem of SHRs. The findings on both metabolites and proteins could provide systemic insights into the pathology basis of altered PUFA and energy metabolism in hypertension, especially in the central nervous system.

Heterogeneous Acupuncture Effects of Taixi (KI3) on Functional Connectivity in Healthy Youth and Elder: A Functional MRI Study Using Regional Homogeneity and Large-Scale Functional Connectivity Analysis

Heterogeneous neurological responses of acupuncture between different groups have been proposed by previous studies but rarely studied. The study described here was designed to explore the divergence of acupuncture at Taixi (KI3) on spontaneous activity of brain regions and functional connectivity (FC) between healthy youth and elder with functional magnetic resonance imaging (fMRI). 20 healthy young volunteers and 20 healthy elders underwent 10-minute-resting-state fMRI before acupuncture, and then acupuncture at Taixi (KI3) for 3 minutes; after withdrawing the needles, volunteers underwent a second fMRI scan for 10 minutes. Regional homogeneity (ReHo) and large-scale FC analysis using Power 264 atlas were utilized to analyze the changes of brain spontaneous activity. Compared with the resting state, the decreased ReHo after acupuncture at KI3 in both groups were concentrated in the left postcentral, right paracentral lobule, and right SMA. Moreover, the subjects in the HY group showed declined ReHo in brain regions involving the right lingual and precentral. However, those subjects in the HE group presented decreased ReHo in the right postcentral and precentral, left supramarginal gyrus and SMA, and both cingulum middle after needling in KI3. Compared with the resting state, the HY group in the postneedling state showed lower mean intranetwork FC in sensory/somatomotor and subcortical network. And the internetwork FC between sensory/somatomotor and dorsal attention had significantly decreased after acupuncture. Furthermore, the internetwork FC between subcortical and dorsal attention and between subcortical and cerebellar showed the most obvious elevations after needling in the HY group. In the elder group, both FCs of internetwork and intranetwork primarily involving sensory/somatomotor, cingulo-opercular, and dorsal attention were declined after acupuncture. These results indicated that acupuncture at KI3 had heterogeneous acupuncture effects in different age groups. Our study led to converging evidence supporting the acupuncture effect segregation of different condition subjects and supporting evidence for prevention and treatment with acupuncture in the future.

Electroacupuncture versus Sham Acupuncture for Perimenopausal Insomnia: A Randomized Controlled Clinical Trial

OBJECTIVE

To evaluate the short- and long-term effects of acupuncture on perimenopausal insomnia (PMI) and quality of life.

PATIENTS AND METHODS

We designed a semi-standardized, patient-blinded, randomized placebo-controlled trial. A total of 84 patients were recruited, all of whom met the criteria for diagnosis of PMI. Either acupuncture therapy or a noninvasive placebo acupuncture therapy designed to treat insomnia was implemented 18 times over the course of 8 weeks (3 times per week for 4 weeks, twice per week for 2 weeks, once per week for 2 weeks). The primary outcome was the change in Pittsburgh Sleep Quality Index (PSQI) scores from baseline to the end of treatment, week 8. Secondary outcomes included climacteric symptoms and quality of life measured by the Menopause Quality of Life (Men-QoL), Insomnia Severity Index (ISI), Self-Rating Anxiety Scale (SAS), Self-Rating Depression Scale (SDS), sleep parameters recorded in the actigraphy and adverse events. The PSQI and Men-QoL were assessed at weeks 0, 4, 8, 12 and 20. Other assessments were performed at week 0 and week 8.

RESULTS

The participants were randomly assigned to either acupuncture (n=42) or sham acupuncture (n=42) groups. The mean difference from baseline of PSQI score at the end of treatment between real acupuncture and sham acupuncture group was -2.38 (95% CI, -3.46 to -1.30; P<0.001). The acupuncture group was associated with significantly lower scores than the sham acupuncture group at week 12 and during the 20-week follow-up visits (all P <0.001). Acupuncture was also associated with significantly higher quality of life in vasomotor and other physical dimensions (all P <0.001). At the end of treatment, researchers found a significantly higher total sleep time (TST), sleep efficiency (SE) and lower number of average awakenings (AA) (P =0.007 0.023 and 0.011, respectively) in the acupuncture group than in the sham acupuncture group. No severe adverse events were reported.

CONCLUSION

The findings suggest that acupuncture may be a safe and effective treatment for PMI and improving quality of sleep in patients with menopause and could have a long-lasting effect.

TRIAL REGISTRATION

Chinese Clinical Trial Registry (ChiCTR); Trial ID: ChiCTR1800018645. URL: http://www.chictr.org.cn/showproj.aspx?proj=31482.

Using Nonlinear Dynamics and Multivariate Statistics to Analyze EEG Signals of Insomniacs with the Intervention of Superficial Acupuncture

Objective

As a noninvasive and nonpharmacological therapeutic approach, superficial acupuncture (SA) is a special method of acupuncture. In this study, using nonlinear dynamics and multivariate statistics, we studied the electroencephalography (EEG) of primary insomnia under SA intervention to investigate how brain regions change.

Method

This study included 30 adults with primary insomnia. They underwent superficial acupuncture at the Shangen acupoint. The EEG signals were collected for 10 minutes at each state, including the resting state, the intervention state, and the postintervention state. The data were conducted using nonlinear dynamics (including approximate entropy (ApEn) and correlation dimension (CD)) and multivariate statistics.

Result

The repeated-measures ANOVA results showed that both ApEn and CD values were not significantly different at the three states (p > 0.05). The paired t-test results showed that the ApEn values of electrodes O2 (the right occipital lobe) at the postintervention state have decreased, compared with the resting state (p < 0.05), and no difference was detected in CD (p > 0.05). The cluster analysis results of ApEn showed that patients' EEG has changed from the right prefrontal lobe (electrode Fp2) to the right posterior temporal lobe (electrode T6) and finally to the right occipital lobe (electrode O2), before, during, and after the SA intervention. In addition, the factor analysis results of CD revealed that patients' EEG of all brain regions except for the occipital lobes has changed to the frontal lobes and anterior temporal and frontal lobes from pre- to postintervention.

Conclusion

SA activated the corresponding brain regions and reduced the complexity of the brain involved. It is feasible to use nonlinear dynamics analysis and multivariate statistics to examine the effects of SA on the human brain.

Improving glucose metabolism in the auditory cortex delays the aging of auditory function of guinea pig

The glucose homeostasis is essential for brain function, and energy deficiency is a key feature of brain aging. We investigated whether improving glucose metabolism in the auditory cortex can delay the aging of auditory function of guinea pigs with age-related hearing loss (ARHL) by d-galactose. Auditory function was assessed by auditory brainstem response (ABR), glucose metabolism was detected by micro PET/CT, and the proteome were identified in auditory cortex by two-dimensional electrophoresis and matrix assisted laser desorption/ionization mass spectrometry. Glucose metabolism decreased in the auditory cortex of d-galactose group, and improving glucose metabolism can delay the aging of auditory function by upregulating seven metabolism-related proteins including ATP synthase subunit beta, triosephosphate isomerase, creatine kinase U-type, pyruvate dehydrogenase E1 component subunit beta, alpha-enolase, phosphoglycerate kinase, and tubulin beta-2A chain. These results suggest that the decrease of glucose metabolism in the auditory cortex may be an important role in the aging of auditory function, and improving glucose metabolism in the auditory cortex can delay the aging of auditory function of guinea pig with ARHL induced by d-galactose.