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年终盘点:2020年阿尔茨海默病十大研究突破(附语音解读)

已有 2434 次阅读 2020-11-28 09:32 |个人分类:神经科学临床和基础|系统分类:科研笔记

​突破一:Cell—科学家聚焦tau蛋白翻译后修饰,阐明tau蛋白翻译后修饰和疾病异质性和疾病病理阶段的联系,揭示tau蛋白翻译后修饰与tau纤维结构的相关性。

Abstract1

Toelucidate the role of Tau isoforms and post-translational modification (PTM)stoichiometry in Alzheimer's disease (AD), we generated a high-resolutionquantitative proteomics map of 95 PTMs on multiple isoforms of Tau isolatedfrom postmortem human tissue from 49 AD and 42 control subjects. Although TauPTM maps reveal heterogeneity across subjects, a subset of PTMs display highoccupancy and frequency for AD, suggesting importance in disease. Unsupervisedanalyses indicate that PTMs occur in an ordered manner, leading to Tauaggregation. The processive addition and minimal set of PTMs associated withseeding activity was further defined by analysis of size-fractionated Tau. Tosummarize, features in the Tau protein critical for disease intervention atdifferent stages of disease are identified, including enrichment of 0N and 4Risoforms, underrepresentation of the C terminus, an increase in negative chargein the proline-rich region (PRR), and a decrease in positive charge in themicrotubule binding domain (MBD).

Abstract2

Tauaggregation into insoluble filaments is the defining pathological hallmark oftauopathies. However, it is not known what controls the formation and templatedseeding of strain-specific structures associated with individual tauopathies.Here, we use cryo-electron microscopy (cryo-EM) to determine the structuresof tau filaments from corticobasal degeneration (CBD) human brain tissue.Cryo-EM and mass spectrometry of tau filaments from CBD reveal that thisconformer is heavily decorated with posttranslational modifications (PTMs),enabling us to map PTMs directly onto the structures. By comparing thestructures and PTMs of tau filaments from CBD and Alzheimer's disease, it isfound that ubiquitination of tau can mediate inter-protofilament interfaces.We propose a structure-based model in which cross-talk between PTMsinfluences tau filament structure, contributing to the structural diversity oftauopathy strains. Our approach establishes a framework for furtherelucidating the relationship between the structures of polymorphic fibrils,including their PTMs, and neurodegenerative disease.

参考文献1Tau PTMProfiles Identify Patient Heterogeneity and Stages of Alzheimer's Disease. Cell.2020 Nov 10;S0092-8674(20)31393-3.

参考文献2PosttranslationalModifications Mediate the Structural Diversity of Tauopathy Strains. Cell. 2020Feb 20;180(4):633-644.e12.

 

突破二:Naturegenetics—科学家聚焦AD特异性表观遗传学组改变及其潜在的表观遗传学因果变异位点。

Abstract1

Proteinaggregation is the hallmark of neurodegeneration, but the molecular mechanismsunderlying late-onset Alzheimer's disease (AD) are unclear. Here we integratedtranscriptomic, proteomic and epigenomic analyses of postmortem human brains toidentify molecular pathways involved in AD. RNA sequencing analysis revealedupregulation of transcription- and chromatin-related genes, including thehistone acetyltransferases for H3K27ac and H3K9ac. An unbiased proteomicscreening singled out H3K27ac and H3K9ac as the main enrichments specific toAD. In turn, epigenomic profiling revealed gains in the histone H3modifications H3K27ac and H3K9ac linked to transcription, chromatin and diseasepathways in ADIncreasing genome-wide H3K27ac and H3K9ac in a fly modelof AD exacerbated amyloid-β42-driven neurodegeneration. Together, thesefindings suggest that AD involves a reconfiguration of the epigenome, whereinH3K27ac and H3K9ac affect disease pathways by dysregulating transcription- andchromatin-gene feedback loops. The identification of this process highlightspotential epigenetic strategies for early-stage disease treatment.

Abstract2

Genome-wideassociation studies of neurological diseases have identified thousands ofvariants associated with disease phenotypes. However, most of these variants donot alter coding sequences, making it difficult to assign their function. Here,we present a multi-omic epigenetic atlas of the adult human brain throughprofiling of single-cell chromatin accessibility landscapes andthree-dimensional chromatin interactions of diverse adult brain regionsacross a cohort of cognitively healthy individuals. We developed a machine-learningclassifier to integrate this multi-omic framework and predict dozens offunctional SNPs for Alzheimer's and Parkinson's diseases, nominating targetgenes and cell types for previously orphaned loci from genome-wide associationstudies. Moreover, we dissected the complex inverted haplotype of the MAPT(encoding tau) Parkinson's disease risk locus, identifying putative ectopicregulatory interactions in neurons that may mediate this disease association.This work expands understanding of inherited variation and provides a roadmapfor the epigenomic dissection of causal regulatory variation in disease.

参考文献1Anintegrated multi-omics approach identifies epigenetic alterations associatedwith Alzheimer's disease. Nat Genet. 2020 Oct;52(10):1024-1035.

参考文献2Single-cellepigenomic analyses implicate candidate causal variants at inherited risk locifor Alzheimer's and Parkinson's diseases. Nat Genet. 2020 Nov;52(11):1158-1168.

 

突破三:Nature—科学家揭示固有免疫蛋白IFITM3激活γ-分泌酶并促进聚集

Abstract

Innateimmunity is associated with Alzheimer's disease1, but the influence of immuneactivation on the production of amyloid-β is unknown2,3. Here we identifyinterferon-induced transmembrane protein 3 (IFITM3) as a γ-secretase modulatoryprotein, and establish a mechanism by which inflammation affects thegeneration of amyloid-β. Inflammatory cytokines induce the expression ofIFITM3 in neurons and astrocytes, which binds to γ-secretase and upregulatesits activity, thereby increasing the production of amyloid-βTheexpression of IFITM3 is increased with ageing and in mouse models that expressfamilial Alzheimer's disease genesFurthermore, knockout of IFITM3reduces γ-secretase activity and the formation of amyloid plaques in atransgenic mouse model (5xFAD) of early amyloid deposition. IFITM3 protein isupregulated in tissue samples from a subset of patients with late-onsetAlzheimer's disease that exhibit higher γ-secretase activity. The amount ofIFITM3 in the γ-secretase complex has a strong and positive correlation withγ-secretase activity in samples from patients with late-onset Alzheimer'sdisease. These findings reveal a mechanism in which γ-secretase is modulated byneuroinflammation via IFITM3 and the risk of Alzheimer's disease is therebyincreased.

参考文献:Theinnate immunity protein IFITM3 modulates γ-secretase in Alzheimer's disease. Nature.2020 Oct;586(7831):735-740.

 

突破四:Science—科学家开发“突触修复手术刀”—CPTX,可修复AD特异性突触和认知损害

Abstract

Neuronalsynapses undergo structural and functional changes throughout life, which areessential for nervous system physiology. However, these changes may alsoperturb the excitatory-inhibitory neurotransmission balance and triggerneuropsychiatric and neurological disorders. Molecular tools to restore this balanceare highly desirable. Here, we designed and characterized CPTX, a syntheticsynaptic organizer combining structural elements from cerebellin-1 andneuronal pentraxin-1CPTX can interact with presynaptic neurexins andpostsynaptic AMPA-type ionotropic glutamate receptors and induced the formationof excitatory synapses both in vitro and in vivoCPTX restored synapticfunctions, motor coordination, spatial and contextual memories, and locomotionin mouse models for cerebellar ataxia, Alzheimer's disease, and spinal cordinjury, respectively. Thus, CPTX represents a prototype forstructure-guided biologics that can efficiently repair or remodel neuronalcircuits.

参考文献:Asynthetic synaptic organizer protein restores glutamatergic neuronal circuits. Science.2020 Aug 28;369(6507):eabb4853.

 

突破五:Cell—空间转录组揭示AD不同阶段老年斑周围细胞基因共表达网络异常改变

Abstract

Althoughcomplex inflammatory-like alterations are observed around the amyloid plaquesof Alzheimer's disease (AD), little is known about the molecular changes andcellular interactions that characterize this response. We investigate here,in an AD mouse model, the transcriptional changes occurring in tissue domainsin a 100-μm diameter around amyloid plaques using spatial transcriptomics. Wedemonstrate early alterations in a gene co-expression network enriched formyelin and oligodendrocyte genes (OLIGs), whereas a multicellular geneco-expression network of plaque-induced genes (PIGs) involving the complementsystem, oxidative stress, lysosomes, and inflammation is prominent in the laterphase of the disease. We confirm the majority of the observedalterations at the cellular level using in situ sequencing on mouse and humanbrain sections. Genome-wide spatial transcriptomics analysis provides anunprecedented approach to untangle the dysregulated cellular network in thevicinity of pathogenic hallmarks of AD and other brain diseases.

参考文献:SpatialTranscriptomics and In Situ Sequencing to Study Alzheimer's Disease. Cell. 2020Aug 20;182(4):976-991.e19.

 

突破六:Nature—科学家揭示APOE4通过诱导血脑屏障功能障碍以促进认知功能下降

Abstract

Vascularcontributions to dementia and Alzheimer's disease are increasinglyrecognized1-6. Recent studies have suggested that breakdown of the blood-brainbarrier (BBB) is an early biomarker of human cognitive dysfunction7, includingthe early clinical stages of Alzheimer's disease5,8-10. The E4 variant ofapolipoprotein E (APOE4), the main susceptibility gene for Alzheimer'sdisease11-14, leads to accelerated breakdown of the BBB and degeneration ofbrain capillary pericytes15-19, which maintain BBB integrity20-22. It isunclear, however, whether the cerebrovascular effects of APOE4 contribute tocognitive impairment. Here we show that individuals bearing APOE4 (with theε3/ε4 or ε4/ε4 alleles) are distinguished from those without APOE4 (ε3/ε3) bybreakdown of the BBB in the hippocampus and medial temporal lobe. This findingis apparent in cognitively unimpaired APOE4 carriers and more severe inthose with cognitive impairment, but is not related to amyloid-β or taupathology measured in cerebrospinal fluid or by positron emission tomography23.High baseline levels of the BBB pericyte injury biomarker soluble PDGFRβ7,8in the cerebrospinal fluid predicted future cognitive decline in APOE4 carriersbut not in non-carriers, even after controlling for amyloid-β and taustatus, and were correlated with increased activity of the BBB-degradingcyclophilin A-matrix metalloproteinase-9 pathway19 in cerebrospinal fluid. Ourfindings suggest that breakdown of the BBB contributes to APOE4-associatedcognitive decline independently of Alzheimer's disease pathology, and mightbe a therapeutic target in APOE4 carriers.

参考文献:APOE4leads to blood-brain barrier dysfunction predicting cognitive decline. Nature.2020 May;581(7806):71-76.

 

突破七:Nature—科学家揭示LRP1tau蛋白摄取和播散的关键调控分子

Abstract

Thespread of protein aggregates during disease progression is a common themeunderlying many neurodegenerative diseases. The microtubule-associated proteintau has a central role in the pathogenesis of several forms of dementia knownas tauopathies-including Alzheimer's disease, frontotemporal dementia andchronic traumatic encephalopathy1. Progression of these diseases ischaracterized by the sequential spread and deposition of protein aggregates ina predictable pattern that correlates with clinical severity2. This observationand complementary experimental studies3,4 have suggested that tau can spreadin a prion-like manner, by passing to naive cells in which it templatesmisfolding and aggregation. However, although the propagation of tau hasbeen extensively studied, the underlying cellular mechanisms remain poorlyunderstood. Here we show that the low-density lipoprotein receptor-relatedprotein 1 (LRP1) controls the endocytosis of tau and its subsequent spread.Knockdown of LRP1 significantly reduced tau uptake in H4 neuroglioma cells and ininduced pluripotent stem cell-derived neurons. The interaction between tauand LRP1 is mediated by lysine residues in the microtubule-binding repeatregion of tau. Furthermore, downregulation of LRP1 in an in vivo mousemodel of tau spread was found to effectively reduce the propagation of taubetween neurons. Our results identify LRP1 as a key regulator of tauspread in the brain, and therefore a potential target for the treatment ofdiseases that involve tau spread and aggregation.

参考文献:LRP1is a master regulator of tau uptake and spread. Nature. 2020Apr;580(7803):381-385.

 

突破八:Nature—科学家揭示AD患者脑脊液中存在克隆性CD8+T细胞的扩增

Abstract

Alzheimer'sdisease is an incurable neurodegenerative disorder in which neuroinflammationhas a critical function1. However, little is known about the contribution ofthe adaptive immune response in Alzheimer's disease2. Here, using integratedanalyses of multiple cohorts, we identify peripheral and central adaptiveimmune changes in Alzheimer's disease. First, we performed mass cytometry ofperipheral blood mononuclear cells and discovered an immune signature ofAlzheimer's disease that consists of increased numbers of CD8+ T effectormemory CD45RA+ (TEMRA) cells. In a second cohort, we found that CD8+TEMRA cells were negatively associated with cognition. Furthermore,single-cell RNA sequencing revealed that T cell receptor (TCR) signalling wasenhanced in these cells. Notably, by using several strategies of single-cellTCR sequencing in a third cohort, we discovered clonally expanded CD8+ TEMRAcells in the cerebrospinal fluid of patients with Alzheimer's disease.Finally, we used machine learning, cloning and peptide screens todemonstrate the specificity of clonally expanded TCRs in the cerebrospinalfluid of patients with Alzheimer's disease to two separate Epstein-Barr virusantigens. These results reveal an adaptive immune response in the blood andcerebrospinal fluid in Alzheimer's disease and provide evidence of clonal,antigen-experienced T cells patrolling the intrathecal space of brains affectedby age-related neurodegeneration.

参考文献:Clonallyexpanded CD8 T cells patrol the cerebrospinal fluid in Alzheimer's disease. Nature.2020 Jan;577(7790):399-404.

 

突破九:Lancet—科学家揭示唐氏综合症成年患者AD特异的临床和生物标志物改变

Abstract

Background:Alzheimer's disease and its complications are the leading cause of deathin adults with Down syndrome. Studies have assessed Alzheimer's disease inindividuals with Down syndrome, but the natural history of biomarker changes inDown syndrome has not been established. We characterised the order andtiming of changes in biomarkers of Alzheimer's disease in a population ofadults with Down syndrome.

Methods:We did a dual-centre cross-sectional study of adults with Down syndromerecruited through a population-based health plan in Barcelona (Spain) andthrough services for people with intellectual disabilities in Cambridge (UK).Cognitive impairment in participants with Down syndrome was classified with theCambridge Cognitive Examination for Older Adults with Down Syndrome(CAMCOG-DS). Only participants with mild or moderate disability wereincluded who had at least one of the following Alzheimer's disease measures:apolipoprotein E allele carrier status; plasma concentrations of amyloid βpeptides 1-42 and 1-40 and their ratio (Aβ1-42/1-40), total tau protein, andneurofilament light chain (NFL); tau phosphorylated at threonine 181 (p-tau),and NFL in cerebrospinal fluid (CSF); and one or more of PET with18F-fluorodeoxyglucose, PET with amyloid tracers, and MRI. Cognitivelyhealthy euploid controls aged up to 75 years who had no biomarker abnormalitieswere recruited from the Sant Pau Initiative on Neurodegeneration. We used afirst-order locally estimated scatterplot smoothing curve to determine theorder and age at onset of the biomarker changes, and the lowest ages at thedivergence with 95% CIs are also reported where appropriate.

Findings:Between Feb 1, 2013, and June 28, 2019 (Barcelona), and between June 1, 2009,and Dec 31, 2014 (Cambridge), we included 388 participants with Downsyndrome (257 [66%] asymptomatic, 48 [12%] with prodromal Alzheimer's disease,and 83 [21%] with Alzheimer's disease dementia) and 242 euploid controls.CSF Aβ1-42/1-40 and plasma NFL values changed in individuals with Down syndromeas early as the third decade of life, and amyloid PET uptake changedin the fourth decade18F-fluorodeoxyglucose PET and CSF p-tau changesoccurred later in the fourth decade of life, followed by hippocampal atrophyand changes in cognition in the fifth decade of life. ProdromalAlzheimer's disease was diagnosed at a median age of 50·2 years (IQR47·5-54·1), and Alzheimer's disease dementia at 53·7 years (49·5-57·2).Symptomatic Alzheimer's disease prevalence increased with age in individualswith Down syndrome, reaching 90-100% in the seventh decade of life.

Interpretation:Alzheimer's disease in individuals with Down syndrome has a long preclinicalphase in which biomarkers follow a predictable order of changes over more thantwo decades. The similarities with sporadic and autosomal dominantAlzheimer's disease and the prevalence of Down syndrome make this population asuitable target for Alzheimer's disease preventive treatments.

参考文献:Clinicaland biomarker changes of Alzheimer's disease in adults with Down syndrome: across-sectional study. Lancet. 2020 Jun 27;395(10242):1988-1997.

 

突破十:Cell—科学家揭示小胶质细胞泛素连接酶COP1通过降解c/EBPβ以抑制神经炎症反应

Abstract

Dysregulatedmicroglia are intimately involved in neurodegeneration, including Alzheimer'sdisease (AD) pathogenesis, but the mechanisms controlling pathogenicmicroglial gene expression remain poorly understood. The transcriptionfactor CCAAT/enhancer binding protein beta (c/EBPβ) regulatespro-inflammatory genes in microglia and is upregulated in AD. We showexpression of c/EBPβ in microglia is regulated post-translationally by the ubiquitinligase COP1 (also called RFWD2). In the absence of COP1, c/EBPβaccumulates rapidly and drives a potent pro-inflammatory andneurodegeneration-related gene program, evidenced by increased neurotoxicity inmicroglia-neuronal co-cultures. Antibody blocking studies reveal thatneurotoxicity is almost entirely attributable to complement. Remarkably, lossof a single allele of Cebpb prevented the pro-inflammatory phenotype. COP1-deficientmicroglia markedly accelerated tau-mediated neurodegeneration in a mouse modelwhere activated microglia play a deleterious role. Thus, COP1 is animportant suppressor of pathogenic c/EBPβ-dependent gene expression programs inmicroglia.

参考文献:UbiquitinLigase COP1 Suppresses Neuroinflammation by Degrading c/EBPβ in Microglia. Cell.2020 Sep 3;182(5):1156-1169.e12.

语音解读

2020-11-26—2020年AD十大研究突破.mp300:0048:39未加入话题

2020年十大研究进展名录



2019年十大研究进展名录

1. 年终盘点:2019年帕金森病十大基础研究进展

2. 年终盘点:2019年帕金森病十大临床研究进展

3. 年终盘点:2019年阿尔茨海默病十大基础研究进展

4. 年终盘点:2019年阿尔茨海默病十大临床研究进展

5. 年终盘点:2019年神经科学领域十大基础研究进展

6. 年终盘点:2019年抑郁症领域十大基础研究进展(一半来自中国)

7. 年终盘点:2019年脑血管病领域十大基础研究进展

8. 年终盘点:2019年神经炎症领域十大基础研究进展

9. 年终盘点:2019年神经活动记录十大基础研究进展

10. 年终盘点:2019年ALS/FTD十大基础研究进展

11. 年终盘点:2019年医学和生物学领域深度学习和神经网络十大基础研究进展

12. 年终盘点:2019年神经内科十大临床研究突破

13. 年终盘点:2019年疼痛防治和痛觉机制十大研究突破

14. 年终盘点:2019年睡眠和失眠领域十大研究突破

15.年终盘点:2019年神经发育及成年神经再生十大研究突破

16. 年终盘点:2019年大脑学习和记忆的十大研究突破

17. 年终盘点:2019年衰老和长寿十大研究突破

18. 年终盘点:2019年自闭症十大研究突破


2018年十大研究进展名录

1.盘点2018年阿尔茨海默病十大研究突破

2.盘点2018年帕金森病十大研究突破

3. 盘点2018年神经科学二十大研究突破

4. 盘点2018年渐冻症(ALS)十大研究进展

5. 盘点2018年全球脑卒中十大研究进展

6. 盘点2018年神经影像十大研究进展

7. 盘点2018年神经炎症领域的十大研究突破

8. 盘点2018年神经变性痴呆十大研究突破

9. 2018年神经科学“学习和记忆”领域十大研究进展

10. 2018年抑郁症领域的十大研究突破

11. 2018年痛觉和疼痛领域的十大研究突破

12. 2018年的神经干细胞研究十大研究进展

13. 2018年的神经干细胞研究十大研究进展

14. 2018年的十大睡眠研究突破

15. 2018年“衰老和长生不老”领域的十大研究突破

16. 2018年自闭症领域的十大研究突破




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20个神经科学领域的突破可能获得诺贝尔奖

1. 意识研究:意识的本质、组成、运行机制及其物质载体;不同意识层次的操控和干预,意识障碍性疾病的治疗。

2. 学习和记忆的机制及其调控:记忆的形成和消退机制,记忆的人为移植和记忆的人为消除等;

3. 痴呆研究:阿尔茨海默病的机制和治疗研究,血管性痴呆、额颞叶痴呆、路易体痴呆的机制研究和治疗。

4. 睡眠和睡眠障碍的机制和干预研究。

5. 情绪研究:喜、怒、哀、恐等基本情绪的机制和相关疾病的治疗。

6. 计算和逻辑推理的神经科学基础研究。

7. 语言的神经科学基础研究。

8. 视觉图像形成和运用的神经科学基础研究。

9. 创造力、想象力和艺术文学创造的神经基础研究。

10. 痛觉的神经科学基础及其干预研究

11. 性行为研究:性行为的神经科学基础研究和性行为的调控和干预。

12. 脑和脊髓损伤的机制及其干预研究,包括脑卒中、脊髓损伤机制研究,神经干细胞移植研究,新型神经修复技术,神经康复技术。

13. 精神类疾病的机制和干预研究:自闭症、精分、抑郁症、智能障碍、药物成瘾等;

14. 运动神经元病等神经变性病机制研究及其干预。

15. 衰老的机制和永生研究,包括大脑衰老的机制和寿命延长研究。

16. 神经系统遗传病的机制研究及基因治疗。

17. 神经操纵和调控技术:光遗传技术、药物遗传技术、基因编辑技术、经颅磁刺激、深部脑刺激和电刺激等。

18. 脑组织兼容性电子微芯片及脑机互动装置研究,包括脑机接口、神经刺激芯片、记忆存储芯片,意识存储芯片,人脑非语言互动装置等。

19. 半人半机器人的设计、完善和修复技术:包括任何机械肢体的人类移植,大脑移植入机器体内等。

20. 新型大脑成像和神经元活动记录技术:高分辨率成像技术、大型电极微阵列技术等。


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