Neural Plasticity最新文献

{"title":"An Exploratory Study of Training Intensity in EEG Neurofeedback.","authors":"Inês Esteves, Wenya Nan, Cristiana Alves, Alexandre Calapez, Fernando Melício, Agostinho Rosa","doi":"10.1155/2021/8881059","DOIUrl":"10.1155/2021/8881059","url":null,"abstract":"<p><p>Neurofeedback training has shown benefits in clinical treatment and behavioral performance enhancement. Despite the wide range of applications, no consensus has been reached about the optimal training schedule. In this work, an EEG neurofeedback practical experiment was conducted aimed at investigating the effects of training intensity on the enhancement of the amplitude in the individual upper alpha band. We designed INTENSIVE and SPARSE training modalities, which differed regarding three essential aspects of training intensity: the number of sessions, the duration of a session, and the interval between sessions. Nine participants in the INTENSIVE group completed 4 sessions with 37.5 minutes each during consecutive days, while nine participants in the SPARSE group performed 6 sessions of 25 minutes spread over approximately 3 weeks. As a result, regarding the short-term effects, the upper alpha band amplitude change within sessions did not significantly differ between the two groups. Nonetheless, only the INTENSIVE group showed a significant increase in the upper alpha band amplitude. However, for the sustained effects across sessions, none of the groups showed significant changes in the upper alpha band amplitude across the whole course of training. The findings suggest that the progression within session is favored by the intensive design. Therefore, based on these findings, it is proposed that training intensity influences EEG self-regulation within sessions. Further investigations are needed to isolate different aspects of training intensity and effectively confirm if one modality globally outperforms the other.</p>","PeriodicalId":19122,"journal":{"name":"Neural Plasticity","volume":"2021 ","pages":"8881059"},"PeriodicalIF":3.1,"publicationDate":"2021-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7979284/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"25525049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Weakened Effective Connectivity Related to Electroacupuncture in Stroke Patients with Prolonged Flaccid Paralysis: An EEG Pilot Study.","authors":"Yi-Fang Lin,&nbsp;Xin-Hua Liu,&nbsp;Zheng-Yu Cui,&nbsp;Zuo-Ting Song,&nbsp;Fei Zou,&nbsp;Shu-Geng Chen,&nbsp;Xiao-Yang Kang,&nbsp;Bin Ye,&nbsp;Qiang Wang,&nbsp;Jing Tian,&nbsp;Jie Jia","doi":"10.1155/2021/6641506","DOIUrl":"https://doi.org/10.1155/2021/6641506","url":null,"abstract":"<p><p>Flaccid paralysis in the upper extremity is a severe motor impairment after stroke, which exists for weeks, months, or even years. Electroacupuncture treatment is one of the most widely used TCM therapeutic interventions for poststroke flaccid paralysis. However, the response to electroacupuncture in different durations of flaccid stage poststroke as well as in the topological configuration of the cortical network remains unclear. The objectives of this study are to explore the disruption of the cortical network in patients in different durations of flaccid stage and observe dynamic network reorganization during and after electroacupuncture. Resting-state networks were constructed from 18 subjects with flaccid upper extremity by partial directed coherence (PDC) analysis of multichannel EEG. They were allocated to three groups according to time after flaccid paralysis: the short-duration group (those with flaccidity for less than two months), the medium-duration group (those with flaccidity between two months and six months), and the long-duration group (those with flaccidity over six months). Compared with short-duration flaccid subjects, weakened effective connectivity was presented in medium-duration and long-duration groups before electroacupuncture. The long-duration group has no response in the cortical network during electroacupuncture. The global network measures of EEG data (sPDC, mPDC, and <i>N</i>) indicated that there was no significant difference among the three groups. These results suggested that the network connectivity reduced and weakly responded to electroacupuncture in patients with flaccid paralysis for over six months. These findings may help us to modulate the formulation of electroacupuncture treatment according to different durations of the flaccid upper extremity.</p>","PeriodicalId":19122,"journal":{"name":"Neural Plasticity","volume":"2021 ","pages":"6641506"},"PeriodicalIF":3.1,"publicationDate":"2021-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7969113/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"25525047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of Acupuncture Stimulation of Hegu (LI4) and Taichong (LR3) on the Resting-State Networks in Alzheimer's Disease: Beyond the Default Mode Network.","authors":"Shaozhen Ji,&nbsp;Hao Zhang,&nbsp;Wen Qin,&nbsp;Ming Liu,&nbsp;Weimin Zheng,&nbsp;Ying Han,&nbsp;Haiqing Song,&nbsp;Kuncheng Li,&nbsp;Jie Lu,&nbsp;Zhiqun Wang","doi":"10.1155/2021/8876873","DOIUrl":"https://doi.org/10.1155/2021/8876873","url":null,"abstract":"<p><p>It was reported that acupuncture could treat Alzheimer's disease (AD) with the potential mechanisms remaining unclear. The aim of the study is to explore the effect of the combination stimulus of Hegu (LI4) and Taichong (LR3) on the resting-state brain networks in AD, beyond the default network (DMN). Twenty-eight subjects including 14 AD patients and 14 healthy controls (HCs) matched by age, gender, and educational level were recruited in this study. After the baseline resting-state MRI scans, the manual acupuncture stimulation was performed for 3 minutes, and then, another 10 minutes of resting-state fMRI scans was acquired. In addition to the DMN, five other resting-state networks were identified by independent component analysis (ICA), including left frontal parietal network (lFPN), right frontal parietal network (rFPN), visual network (VN), sensorimotor network (SMN), and auditory network (AN). And the impaired connectivity in the lFPN, rFPN, SMN, and VN was found in AD patients compared with those in HCs. After acupuncture, significantly decreased connectivity in the right middle frontal gyrus (MFG) of rFPN (<i>P</i> = 0.007) was identified in AD patients. However, reduced connectivity in the right inferior frontal gyrus (IFG) (<i>P</i> = 0.047) and left superior frontal gyrus (SFG) (<i>P</i> = 0.041) of lFPN and some regions of the SMN (the left inferior parietal lobula (<i>P</i> = 0.004), left postcentral gyrus (PoCG) (<i>P</i> = 0.001), right PoCG (<i>P</i> = 0.032), and right MFG (<i>P</i> = 0.010)) and the right MOG of VN (<i>P</i> = 0.003) was indicated in HCs. In addition, after controlling for the effect of acupuncture on HCs, the functional connectivity of the right cerebellum crus I, left IFG, and left angular gyrus (AG) of lFPN showed to be decreased, while the left MFG of IFPN and the right lingual gyrus of VN increased in AD patients. These findings might have some reference values for the interpretation of the combination stimulus of Hegu (LI4) and Taichong (LR3) in AD patients, which could deepen our understanding of the potential mechanisms of acupuncture on AD.</p>","PeriodicalId":19122,"journal":{"name":"Neural Plasticity","volume":"2021 ","pages":"8876873"},"PeriodicalIF":3.1,"publicationDate":"2021-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7960059/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"25500964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Resting-State Network Plasticity Induced by Music Therapy after Traumatic Brain Injury.","authors":"Noelia Martínez-Molina,&nbsp;Sini-Tuuli Siponkoski,&nbsp;Linda Kuusela,&nbsp;Sari Laitinen,&nbsp;Milla Holma,&nbsp;Mirja Ahlfors,&nbsp;Päivi Jordan-Kilkki,&nbsp;Katja Ala-Kauhaluoma,&nbsp;Susanna Melkas,&nbsp;Johanna Pekkola,&nbsp;Antoni Rodríguez-Fornells,&nbsp;Matti Laine,&nbsp;Aarne Ylinen,&nbsp;Pekka Rantanen,&nbsp;Sanna Koskinen,&nbsp;Benjamin Ultan Cowley,&nbsp;Teppo Särkämö","doi":"10.1155/2021/6682471","DOIUrl":"https://doi.org/10.1155/2021/6682471","url":null,"abstract":"<p><p>Traumatic brain injury (TBI) is characterized by a complex pattern of abnormalities in resting-state functional connectivity (rsFC) and network dysfunction, which can potentially be ameliorated by rehabilitation. In our previous randomized controlled trial, we found that a 3-month neurological music therapy intervention enhanced executive function (EF) and increased grey matter volume in the right inferior frontal gyrus (IFG) in patients with moderate-to-severe TBI (<i>N</i> = 40). Extending this study, we performed longitudinal rsFC analyses of resting-state fMRI data using a ROI-to-ROI approach assessing within-network and between-network rsFC in the frontoparietal (FPN), dorsal attention (DAN), default mode (DMN), and salience (SAL) networks, which all have been associated with cognitive impairment after TBI. We also performed a seed-based connectivity analysis between the right IFG and whole-brain rsFC. The results showed that neurological music therapy increased the coupling between the FPN and DAN as well as between these networks and primary sensory networks. By contrast, the DMN was less connected with sensory networks after the intervention. Similarly, there was a shift towards a less connected state within the FPN and SAL networks, which are typically hyperconnected following TBI. Improvements in EF were correlated with rsFC within the FPN and between the DMN and sensorimotor networks. Finally, in the seed-based connectivity analysis, the right IFG showed increased rsFC with the right inferior parietal and left frontoparietal (Rolandic operculum) regions. Together, these results indicate that the rehabilitative effects of neurological music therapy after TBI are underpinned by a pattern of within- and between-network connectivity changes in cognitive networks as well as increased connectivity between frontal and parietal regions associated with music processing.</p>","PeriodicalId":19122,"journal":{"name":"Neural Plasticity","volume":"2021 ","pages":"6682471"},"PeriodicalIF":3.1,"publicationDate":"2021-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7964116/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"25514033","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Focal Vibration Alters Human Digital Sensory Nerve Action Potentials: A Pilot Study.","authors":"Dong Qing Zhu,&nbsp;Fang Liu,&nbsp;Yu Zhu,&nbsp;Duan Lei,&nbsp;Xiang Jin,&nbsp;Lan Xu,&nbsp;Chao Jun Zheng,&nbsp;Robert Weber,&nbsp;Xiang Jun Chen","doi":"10.1155/2021/8819169","DOIUrl":"https://doi.org/10.1155/2021/8819169","url":null,"abstract":"<p><strong>Introduction: </strong>We studied the impact of vibratory stimulation on the electrophysiological features of digital sensory nerve action potential (SNAP).</p><p><strong>Methods: </strong>The antidromic digit 3 SNAP was recorded in 19 healthy adults before, during, and after applying a vibration to either 3rd or 5th metacarpal phalangeal joint (MCPJ) at 60 Hz and amplitude of 2 mm. 100% supramaximal stimulus intensity was performed in 5 subjects (randomly selected from the 19 subjects) where the SNAP sizes were recorded.</p><p><strong>Results: </strong>The amplitude of digit 3 SNAP declined to 58.9 ± 8.6% when a vibration was applied to MCPJ digit 3. These impacts did not change by increasing the electrical stimulus intensity. The SNAP regained its baseline value immediately after the cessation of vibration stimulation. The magnitude of size reduction of digit 3 SNAP was less when vibration was moved to from MCPJ of digit 3 to MCPJ of digit 5. <i>Discussion</i>. The marked drop of the SNAP size during vibratory stimulation reflects the decreased responsiveness of A<i>β</i> afferents to electrical stimulation, which deserve further investigation in the study of focal vibration in neurorehabilitation.</p>","PeriodicalId":19122,"journal":{"name":"Neural Plasticity","volume":"2021 ","pages":"8819169"},"PeriodicalIF":3.1,"publicationDate":"2021-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7949868/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"25514032","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of Hepatoma-Derived Growth Factor Blockade on Resiniferatoxin-Induced Neuropathy.","authors":"Chieh-Hsin Wu, Ming-Kung Wu, Chun-Ching Lu, Hung-Pei Tsai, Ying-Yi Lu, Chih-Lung Lin","doi":"10.1155/2021/8854461","DOIUrl":"10.1155/2021/8854461","url":null,"abstract":"<p><p>Resiniferatoxin is an ultrapotent capsaicin analog that mediates nociceptive processing; treatment with resiniferatoxin can cause an inflammatory response and, ultimately, neuropathic pain. Hepatoma-derived growth factor, a growth factor related to normal development, is associated with neurotransmitters surrounding neurons and glial cells. Therefore, the study aims to investigate how blocking hepatoma-derived growth factor affects the inflammatory response in neuropathic pain. Serum hepatoma-derived growth factor protein expression was measured via ELISA. Resiniferatoxin was administrated intraperitoneally to induce neuropathic pain in 36 male Sprague-Dawley rats which were divided into three groups (resiniferatoxin+recombinant hepatoma-derived growth factor antibody group, resiniferatoxin group, and control group) (<i>n</i> = 12/group). The mechanical threshold response was tested with calibration forceps. Cell apoptosis was measured by TUNEL assay. Immunofluorescence staining was performed to detect apoptosis of neuron cells and proliferation of astrocytes in the spinal cord dorsal horn. RT-PCR technique and western blot were used to measure detect inflammatory factors and protein expressions. Serum hepatoma-derived growth factor protein expression was higher in the patients with sciatica compared to controls. In resiniferatoxin-group rats, protein expression of hepatoma-derived growth factor was higher than controls. Blocking hepatoma-derived growth factor improved the mechanical threshold response in rats. In dorsal root ganglion, blocking hepatoma-derived growth factor inhibited inflammatory cytokines. In the spinal cord dorsal horn, blocking hepatoma-derived growth factor inhibited proliferation of astrocyte, apoptosis of neuron cells, and attenuated expressions of pain-associated proteins. The experiment showed that blocking hepatoma-derived growth factor can prevent neuropathic pain and may be a useful alternative to conventional analgesics.</p>","PeriodicalId":19122,"journal":{"name":"Neural Plasticity","volume":"2021 ","pages":"8854461"},"PeriodicalIF":3.1,"publicationDate":"2021-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7937473/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"25485320","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synergistic Network Pharmacology for Traditional Chinese Medicine Liangxue Tongyu Formula in Acute Intracerebral Hemorrhagic Stroke.","authors":"Yang Chen,&nbsp;Ju Dong,&nbsp;Dongqing Yang,&nbsp;Qin Qian,&nbsp;Pengcheng Wang,&nbsp;Xiaojuan Yang,&nbsp;Wei Li,&nbsp;Guochun Li,&nbsp;Xu Shen,&nbsp;Fushun Wang","doi":"10.1155/2021/8874296","DOIUrl":"https://doi.org/10.1155/2021/8874296","url":null,"abstract":"<p><strong>Background: </strong>Nowadays, acute intracerebral hemorrhage stroke (AICH) still causes higher mortality. Liangxue Tongyu Formula (LXTYF), originating from a traditional Chinese medicine (TCM) prescription, is widely used as auxiliary treatment for AICH.</p><p><strong>Objective: </strong>To dig into the multicomponent, multitarget, and multipathway mechanism of LXTYF on treating AICH via network pharmacology and RNA-seq.</p><p><strong>Methods: </strong>Network pharmacology analysis was used by ingredient collection, target exploration and prediction, network construction, and Gene Ontology (GO) and KEGG analysis, with the Cytoscape software and ClusterProfiler package in R. The RNA-seq data of the AICH-rats were analyzed for differential expression and functional enrichments. Herb-Compound-Target-Pathway (H-C-T-P) network was shown to clarify the mechanism of LXTYF for AICH.</p><p><strong>Results: </strong>76 active ingredients (quercetin, Alanine, kaempferol, etc.) of LXTYF and 376 putative targets to alleviate AICH (PTGS2, PTGS1, ESR1, etc.) were successfully identified. The protein-protein interaction (PPI) network indicated the important role of STAT3. The functional enrichment of GO and KEGG pathway showed that LXTYF is most likely to influence MAPK and PI3K-Akt signaling pathways for AICH treatment. From the RNA-seq of AICH-rats, 583 differential mRNAs were identified and 14 of them were consistent with the putative targets of LXTYF for AICH treatment. The KEGG pathway enrichment also implied that the MAPK signaling pathway was the most correlated one among all the related signaling pathways. Many important targets with expression changes of LXTYF for AICH treatment and their related pathways are great markers of antioxidation, anti-inflammatory, antiapoptosis, and lowering blood pressure, which indicated that LXTYF may play mutiroles in the mechanisms for AICH treatment.</p><p><strong>Conclusion: </strong>The LXTYF attenuates AICH partially by antioxidation, anti-inflammatory, and antiapoptosis and lowers blood pressure roles through regulating the targets involved MAPK, calcium, apoptosis, and TNF signaling pathway, which provide notable clues for further experimental validation.</p>","PeriodicalId":19122,"journal":{"name":"Neural Plasticity","volume":"2021 ","pages":"8874296"},"PeriodicalIF":3.1,"publicationDate":"2021-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7936909/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"25495745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Shi-Zhen-An-Shen Decoction, a Herbal Medicine That Reverses Cuprizone-Induced Demyelination and Behavioral Deficits in Mice Independent of the Neuregulin-1 Pathway.","authors":"Chao Ma,&nbsp;Yan Wu,&nbsp;Xinyao Liu,&nbsp;Yi He,&nbsp;Yuan Jia,&nbsp;Pei Chen,&nbsp;Dongqing Yin,&nbsp;Yanzhe Ning,&nbsp;Guoqiang Xing,&nbsp;Zuoli Sun,&nbsp;Hongxiao Jia","doi":"10.1155/2021/8812362","DOIUrl":"https://doi.org/10.1155/2021/8812362","url":null,"abstract":"<p><p>Shi-Zhen-An-Shen decoction (SZASD), a Chinese herbal medicine that is a liquor extracted from plants by boiling, has been reported to be effective in treating schizophrenia. However, the mechanism is unclear. Abnormal demyelination has been implicated in schizophrenia. The aim of this study was to investigate the effect of SZASD on myelin in demyelinated mice exhibiting schizophrenia-like behaviors. Sixty male C57BL/6 mice were randomly divided into six groups (<i>n</i> = 10 per group): (1) control group, (2) cuprizone (CPZ, a copper chelator that induced demyelination, 0.2% <i>w</i>/<i>w</i>)+saline, (3) CPZ+low-dose SZASD (8.65 g·kg^-1·d^-1), (4) CPZ+medium-dose SZASD (17.29 g·kg^-1·d^-1), (5) CPZ+high-dose SZASD (25.94 g·kg^-1·d^-1), and (6) CPZ+quetiapine (QTP, an atypical antipsychotic that served as a positive treatment control, 10 mg·kg^-1·d^-1). Mice in groups 2-6 were treated with CPZ added to rodent chow for six weeks to induce demyelination. During the last two weeks, these mice were given an oral gavage of sterile saline, SZASD, or quetiapine. Behavioral tests and brain analyses were conducted after the last treatment. The brain expression of myelin basic protein (MBP) and neuregulin-1 (NRG-1) was assessed using immunohistochemistry and Western blots. CPZ induced significant schizophrenia-like behaviors in the mice, including reduced nest-building activity and sensory gating deficits. Hyperlocomotor activity was accompanied by significant reductions in MBP expression in the corpus callosum, hippocampus, and cerebral cortex. However, both QTP and SZASD significantly reversed the schizophrenia-like behaviors and demyelination in CPZ-fed mice. The QTP and medium-dose SZASD resulted in better therapeutic effects compared to the low and high SZASD doses. Reduced NRG-1 expression was observed in CPZ-fed mice compared with controls, but neither QTP nor SZASD showed significant influence on NRG-1 expression in the hippocampus. Together, SZASD showed a therapeutic effect on demyelinated mice, and the improvement of demyelination might not be through the NRG-1 pathway.</p>","PeriodicalId":19122,"journal":{"name":"Neural Plasticity","volume":"2021 ","pages":"8812362"},"PeriodicalIF":3.1,"publicationDate":"2021-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7932787/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"25468571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Celecoxib-Loaded Electrospun Fibrous Antiadhesion Membranes Reduce COX-2/PGE₂ Induced Inflammation and Epidural Fibrosis in a Rat Failed Back Surgery Syndrome Model.","authors":"Wei Wang, Yunhao Wang, Tengfei Lou, Mingqian Ding, Juehong Li, Hao Xiong, Zhixiao Yao, Yingying Ma, Huajiang Chen, Shenghe Liu","doi":"10.1155/2021/6684176","DOIUrl":"10.1155/2021/6684176","url":null,"abstract":"<p><p>To date, failed back surgery syndrome (FBSS) remains a therapy-refractory clinical condition after spinal surgery. The antiadhesion membrane is applied to prevent FBSS by isolating fibrosis; however, the inflammation stimulated by the foreign body and surgical trauma needs to be further resolved simultaneously. Therefore, we developed new electrospun polycaprolactone (PCL) fibrous membranes loaded with celecoxib (CEL) to prevent fibrosis and inflammation associated with FBSS. The CEL-loaded PCL fibers were randomly distributed, and the drug was released over two weeks. Fluorescence micrographs revealed that the fibroblasts proliferated less on the PCL-CEL fibrous membranes than in the PCL group and the blank control. In the rat laminectomy model after 4 weeks, magnetic resonance imaging of epidural fibrosis was least in the PCL-CEL group. Expression of COX-2 and PGE₂ was lower in the PCL-CEL group. It concluded that the CEL-loaded PCL membrane could reduce fibrosis and inflammation in a rat model of FBSS via COX-2/PGE₂ signaling pathways.</p>","PeriodicalId":19122,"journal":{"name":"Neural Plasticity","volume":"2021 ","pages":"6684176"},"PeriodicalIF":3.1,"publicationDate":"2021-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7925049/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"25444115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dynamics of a Large-Scale Spiking Neural Network with Quadratic Integrate-and-Fire Neurons.","authors":"Weijie Ye","doi":"10.1155/2021/6623926","DOIUrl":"10.1155/2021/6623926","url":null,"abstract":"<p><p>Since the high dimension and complexity of the large-scale spiking neural network, it is difficult to research the network dynamics. In recent decades, the mean-field approximation has been a useful method to reduce the dimension of the network. In this study, we construct a large-scale spiking neural network with quadratic integrate-and-fire neurons and reduce it to a mean-field model to research the network dynamics. We find that the activity of the mean-field model is consistent with the network activity. Based on this agreement, a two-parameter bifurcation analysis is performed on the mean-field model to understand the network dynamics. The bifurcation scenario indicates that the network model has the quiescence state, the steady state with a relatively high firing rate, and the synchronization state which correspond to the stable node, stable focus, and stable limit cycle of the system, respectively. There exist several stable limit cycles with different periods, so we can observe the synchronization states with different periods. Additionally, the model shows bistability in some regions of the bifurcation diagram which suggests that two different activities coexist in the network. The mechanisms that how these states switch are also indicated by the bifurcation curves.</p>","PeriodicalId":19122,"journal":{"name":"Neural Plasticity","volume":"2021 ","pages":"6623926"},"PeriodicalIF":3.1,"publicationDate":"2021-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7925051/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"25444113","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}