Beijing Key Laboratory of Geriatric Cognitive Disorders

Beijing, China

Beijing Key Laboratory of Geriatric Cognitive Disorders

Beijing, China
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Li F.,Capital Medical University | Chen S.,Capital Medical University | Wei C.,Capital Medical University | Jia J.,Capital Medical University | And 3 more authors.
BMC Neurology | Year: 2017

Background: Alzheimer's disease (AD) is the most common type of dementia. International multilateral cost-of-illness (COI) studies have revealed that the cost of treating this disease is huge, which places a significant burden on patients' families and their healthcare systems. However, no such studies have been conducted in China. This study estimates the monetary costs of patients with AD in mainland China. Methods: This study planned to start in October 2015 and to finish in March 2016. It covered 30 provincial, municipal, and autonomous regions in mainland China. The sites and research centres in each region were selected randomly. The participating sites include Tier 3 hospitals, psychiatric hospitals, geriatric hospitals, nursing homes, and residences. More than 2500 patients with AD and their caregivers from all of the 81 research centres will be enrolled to fulfil the calculated sample size. The monetary costs of AD, which include direct medical costs, direct non-medical costs, and indirect costs, are being collected using the electronic medical record system and residence health system at each site; face-to-face interviews are being performed when necessary. Descriptive statistics will be used to summarise the patient characteristics and generalised linear models will be developed to calculate the costs. Results: The main findings will include national and per patient annual monetary costs of AD in China. Conclusions: To the best of our knowledge, this is the first large-scale cluster-randomized observational study to estimate the economic burden of AD in Chinese patients. The methodology used was based on China's current healthcare system and is suitable for the purpose of the study. Because the burden of AD on patients, families, healthcare providers, and society is substantial and increasing, it is important and necessary to understand the economic burden caused by this disease. Trial registration: Our trial was retrospectively registered on, NCT02694445, registered on 02/26/2016 © 2017 The Author(s).

Xie Y.,Capital Medical University | Cui Z.,Beijing Normal University | Zhang Z.,Mudanjiang Medical College | Sun Y.,Capital Medical University | And 8 more authors.
Journal of Alzheimer's Disease | Year: 2015

Identifying amnestic mild cognitive impairment (aMCI) is of great clinical importance because aMCI is a putative prodromal stage of Alzheimer's disease. The present study aimed to explore the feasibility of accurately identifying aMCI with a magnetic resonance imaging (MRI) biomarker.We integrated measures of both gray matter (GM) abnormalities derived from structural MRI and white matter (WM) alterations acquired from diffusion tensor imaging at the voxel level across the entire brain. In particular, multi-modal brain features, including GM volume, WM fractional anisotropy, and mean diffusivity, were extracted from a relatively large sample of 64 Han Chinese aMCI patients and 64 matched controls. Then, support vector machine classifiers for GM volume, FA, and MD were fused to distinguish the aMCI patients from the controls. The fused classifier was evaluated with the leave-one-out and the 10-fold cross-validations, and the classifier had an accuracy of 83.59% and an area under the curve of 0.862. The most discriminative regions of GM were mainly located in the medial temporal lobe, temporal lobe, precuneus, cingulate gyrus, parietal lobe, and frontal lobe, whereas the most discriminative regions of WM were mainly located in the corpus callosum, cingulum, corona radiata, frontal lobe, and parietal lobe. Our findings suggest that aMCI is characterized by a distributed pattern of GM abnormalities and WM alterations that represent discriminative power and reflect relevant pathological changes in the brain, and these changes further highlight the advantage of multi-modal feature integration for identifying aMCI. © 2015 - IOS Press and the authors. All rights reserved.

Zou X.-D.,Capital Medical University | Chung Y.-C.,CAS Shenzhen Institute of Biomedical and Health Engineering | Zhang L.,CAS Shenzhen Institute of Biomedical and Health Engineering | Han Y.,Capital Medical University | And 6 more authors.
BioMed Research International | Year: 2015

Purpose. Conventional two-dimensional vessel wall imaging has been used to depict the middle cerebral artery (MCA) wall in patients with recent small subcortical infarctions (RSSIs). However, its clinical use has been limited by restricted spatial coverage, low signal-to-noise ratio (SNR), and long scan time. We used a novel three-dimensional high-resolution MR imaging (3D HR-MRI) technique to investigate the presence, locations, and contrast-enhanced patterns of MCA plaques and their relationship with RSSI. Methods. Nineteen consecutive patients with RSSI but no luminal stenosis on MR angiography were prospectively enrolled. 3D HR-MRI was performed using a T1w-SPACE sequence at 3.0 T. The presence, locations, and contrast-enhanced patterns of the MCA plaques on the ipsilateral and contralateral sides to the RSSI were analyzed. Results. Eighteen patients successfully completed the study. MCA atherosclerotic plaques occurred more frequently on the ipsilateral than the contralateral side to the RSSI (72.2% versus 33.3%, P=0.044). The occurrence of superiorly located plaques was significantly higher on the ipsilateral than the contralateral side of the MCA (66.7% versus 27.8%; P=0.044). Conclusions. Superiorly located plaques are closely associated with RSSI. 3D high-resolution vessel wall imaging may be a potential tool for etiologic assessment of ischemic stroke. © 2015 Xiao-Dong Zou et al.

Shen L.,Capital Medical University | Jia J.,Capital Medical University | Jia J.,Beijing Institute for Brain Disorders | Jia J.,Beijing Key Laboratory of Geriatric Cognitive Disorders | Jia J.,Neurodegenerative Laboratory Of Ministry Of Education Of The Peoples Republic Of China
Neuroscience Bulletin | Year: 2016

Genome-wide association studies (GWASs) have revealed a plethora of putative susceptibility genes for Alzheimer’s disease (AD). With the sole exception of the APOE gene, these AD susceptibility genes have not been unequivocally validated in independent studies. No single novel functional risk genetic variant has been identified. In this review, we evaluate recent GWASs of AD, and discuss their significance, limitations, and challenges in the investigation of the genetic spectrum of AD. © 2016 Shanghai Institutes for Biological Sciences, CAS and Springer Science+Business Media Singapore

Zhang Y.,Capital Medical University | Lu L.,Capital Medical University | Jia J.,Capital Medical University | Jia J.,Beijing Key Laboratory of Geriatric Cognitive Disorders | And 15 more authors.
PLoS ONE | Year: 2014

Transgenic mouse models are powerful tools in exploring the mechanisms of AD. Most current transgenic models of AD mimic the memory impairment and the main pathologic features, among which the formation of beta-amyloid (Aβ) plaques is considered a dominant pathologic event. Recently, Aβ oligomers have been identified as more neurotoxic than Aβ plaques. However, no ideal transgenic mouse model directly support Ab oligomers as a neurotoxic species due to the puzzling effects of amyloid plaques in the more widely-used models. Here, we constructed a single-mutant transgenic (Tg) model harboring the PS1V97L mutation and used Non-Tg littermates as a control group. Employing the Morris water maze, electrophysiology, immunohistochemistry, biochemistry, and electron microscopy, we investigated behavioral changes and pathology progression in our single-mutant transgenic model. We discovered the pathological alteration of intraneuronal accumulation of Aβ oligomers without Aβ plaques in the PS1V97L-Tg mouse model, which might be the result of PS1 gene mutation. Following Aβ oligomers, we detected synaptic alteration, tau hyperphosphorylation and glial activation. This model supports an initial role for Aβ oligomers in the onset of AD and suggests that Aβ plaques may not be the only prerequisite. This model provides a useful tool for studying the role of Aβ oligomers in AD pathogenesis. © 2014 Zhang et al.

Wang Q.,Capital Medical University | Jia J.,Capital Medical University | Jia J.,Beijing Institute for Brain Disorders | Jia J.,Beijing Key Laboratory of Geriatric Cognitive Disorders | And 17 more authors.
Journal of Alzheimer's Disease | Year: 2015

Background: Mutations within exons 16 and 17 of the amyloid-β protein precursor (AβPP) gene were the first known causes of early-onset familial Alzheimer's disease (EOFAD). Since the first AβPP mutation was reported, 39 different AβPP variations have been discovered in EOFAD. Objective:We described a novelAβPP M722K mutation found in a Chinese familial Alzheimer's disease pedigree and confirmed its effects on amyloid-β (Aβ) secretion and tau phosphorylation. Methods: We performed direct sequencing of exons 16 and 17 of the AβPP gene and coding exons 3-12 of the PSEN1 and PSEN2 genes for genetic analysis. N2a cells were transfected with wild-type AβPP, AβPP constructs harboring the M722K mutation, or AβPP constructs harboring the Swedish mutation to demonstrate the effects of the AβPP M722K mutation on Aβ secretion and tau phosphorylation. Results: Different phenotypes of patients carrying the AβPP M722K mutation maybe were related to different apolipoprotein E genotypes. The expression of AβPP M722K in mouse neuroblastoma N2a cells induced a 1.7-fold increased ratio of Aβ42 to Aβ40 without changes in sAβPPα and sAβPPβ. Tau phosphorylation at the AT8 sites was also increased. Conclusion: Maybe the AβPP M722K mutation contributed to the cause of EOFAD in this Chinese pedigree mediated by increased Aβ42/Aβ40. Further studies should be conducted to validate the pathogenicity of AβPP M722K and the interactions among γ-secretase, APOE, and AβPP. © 2015 - IOS Press and the authors. All rights reserved.

Lin F.,Capital Medical University | Jia J.,Capital Medical University | Jia J.,Beijing Institute for Brain Disorders | Jia J.,Beijing Key Laboratory of Geriatric Cognitive Disorders | And 5 more authors.
NeuroReport | Year: 2014

The β-amyloid (Aβ) oligomer rather than fibrillar Aβ has become the important focus of recent studies on the pathogenesis of Alzheimer's disease (AD). Insulin signaling plays important roles in cognitive disease, such as AD. However, in-vivo evidence for the link between central insulin signaling and the Aβ oligomer are lacking, and the mechanisms underlying the effect of central insulin signaling on AD are still elusive. Our team has established the Presenilin-1 Val97Leu mutant transgenic (PS1V97L) AD mouse model with the intraneuronal Aβ oligomer as the potential initiator for other pathologies, but without extracellular amyloid plaque formation. Using this model, we investigated the roles of disturbed central insulin signaling induced by intracerebroventricular injection of streptozotocin (STZ) in the progression of AD. We observed that PS1V97L mice after intracerebroventricular injection of STZ showed increased Aβ oligomer accumulation and aggravated spatial learning and memory deficit in the absence of diabetes symptoms. Furthermore, STZ administration inhibited the activation of the insulin receptor and enhanced the activation of c-Jun NH2-terminal kinase, which was accompanied by increased production of carboxy-terminal fragments from the amyloid precursor protein, in the brain of PS1V97L mice. Overall, our study provided in-vivo evidence for a role of central insulin signaling in AD progression. NeuroReport 25:1289-1295 © 2014 Wolters Kluwer Health - Lippincott Williams & Wilkins.

Li H.,Capital Medical University | Jia J.,Capital Medical University | Jia J.,Beijing Institute for Brain Disorders | Jia J.,Beijing Key Laboratory of Geriatric Cognitive Disorders | And 2 more authors.
Journal of Alzheimer's Disease | Year: 2016

Background: Chinese nationwide norms of the Mini-Mental State Examination (MMSE) have not been established despite its wide use. Objective: To obtain norms for the MMSE based on age, gender, education, and rural or urban residences and to determine the optimal cut-off points of the MMSE in elderly Chinese. Methods: A cross-sectional study was conducted in Chinese community residents aged 65 years or over selected by cluster random sampling. The MMSE was administered to 9,629 subjects (7,110 cognitively normal, 2,024 with mild cognitive impairment, and 495 with dementia). The demographic influences on MMSE scores were investigated and the norms were established considering those factors. Receiver operating characteristic (ROC) analysis was used to determine the optimal cut-off points. Results: Years of education (standardized β=0.399), rural residence (standardized β=-0.261), age (standardized β=-0.198), and being female (standardized β=-0.101) had significant effects on MMSE scores (p<0.001). Accordingly, we presented the demographic-stratified normative data for the MMSE. The optimal cut-off points for dementia screening were 16/17 for illiterate (sensitivity 87.6 and specificity 80.8), 19/20 for individuals with 1-6 years of education (sensitivity 93.6 and specificity 92.7), and 23/24 for individuals with 7 or more years of education (sensitivity 94.3 and specificity 94.3). Conclusion: We provide the age-, gender-, education-, and residence-specific reference norms for the MMSE derived from an investigation of a large-scale, multicenter, nationwide representative Chinese elderly population. It could be of great improvement for the use of the MMSE in dementia screening in Chinese elderly population. © 2016 - IOS Press and the authors. All rights reserved.

Peng M.,Capital Medical University | Peng M.,Beijing Institute for Brain Disorders | Peng M.,Beijing Key Laboratory of Geriatric Cognitive Disorders | Peng M.,Key Neurodegenerative Laboratory of Ministry of Education of the Peoples Republic of China | And 7 more authors.
Neuroscience Letters | Year: 2015

Gelsolin (GSN) levels and matrix metalloproteinase 3 (MMP3) activity have been found to be altered in the plasma in patients with Alzheimer disease (AD). The aim of this study was to determine whether a combination of these proteins with clinical data is specific and sensitive enough for AD diagnosis. In 113 non-demented controls and 113 patients with probable AD, the plasma GSN levels were determined using the enzyme-linked immunosorbent assay (ELISA), and the plasma MMP3 activity was determined using casein zymography. Logistic regression and receiver operating characteristic (ROC) curve analysis were used to determine the diagnostic accuracy of these proteins combined with clinical data. Compared with the controls, the AD patients had significantly lower GSN levels and significantly higher MMP3 activity. Moreover, both the GSN level and MMP3 activity were significantly correlated with the MMSE scores. In AD patients, the GSN level was negatively correlated with MMP3 activity. ROC curve analysis showed that the specificity and sensitivity were 77% and 75.2%, respectively, for the combination of the following candidate biomarkers: GSN level/the total amount of Aβ42 and Aβ40, plasma MMP3 activity and clinical data. With its relatively high sensitivity and specificity, this combined biomarker panel may have potential for the screening of AD patients. © 2015 Elsevier Ireland Ltd.

Xing Y.,Capital Medical University | Tang Y.,Capital Medical University | Jia J.,Capital Medical University | Jia J.,Beijing Institute for Brain Disorders | And 2 more authors.
Behavioural Neurology | Year: 2015

Sex differences in neuropsychiatric symptoms of Alzheimer's disease (AD) have been demonstrated in previous studies, and apolipoprotein E (ApoE) ε4 status influences psychiatric manifestations of AD. However, whether ApoE ε4 status modifies the sex differences in neuropsychiatric symptoms of AD is still unclear. In this study, sex differences in neuropsychiatric abnormalities were stratified and analyzed by ApoE ε4 status in mild AD and moderate to severe AD separately. The Clinical Dementia Rating (CDR) scale and the Neuropsychiatric Inventory (NPI) were used to assess dementia severity and neuropsychiatric symptoms. No sex differences were found in mild AD. In moderate to severe AD, among ε4 positive individuals, disinhibition was significantly more prevalent (8.0% in men versus 43.2% in women, p=0.003) and severer p=0.003 in female patients. The frequency (16.0% in men versus 51.4% in women, p=0.005) and score p=0.004 of irritability were of borderline significance after strict Bonferroni correction. In conclusion, this study supported the modifying effect of ApoE ε4 status on sex differences in neuropsychiatric symptoms of AD, and this modifying effect was pronounced in moderate to severe stage of AD. The interaction between gender and ApoE ε4 status should be considered in studies on neuropsychiatric symptoms of AD. © 2015 Yi Xing et al.

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