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The Journal of Alzheimer’s Disease is an international multidisciplinary journal to facilitate progress in understanding the etiology, pathogenesis, epidemiology, genetics, behavior, treatment and psychology of Alzheimer’s disease.
The journal publishes research reports, reviews, short communications, book reviews, and letters-to-the-editor. The journal is dedicated to providing an open forum for original research that will expedite our fundamental understanding of Alzheimer’s disease.
Authors: Ortí-Casañ, Natalia | Wajant, Harald | Kuiperij, H. Bea | Hooijsma, Annelien | Tromp, Leon | Poortman, Isabelle L. | Tadema, Norick | de Lange, Julia H.E. | Verbeek, Marcel M. | De Deyn, Peter P. | Naudé, Petrus J.W. | Eisel, Ulrich L.M.
Article Type: Research Article
Abstract: Background: Tumor necrosis factor-alpha (TNF-α ) is a master cytokine involved in a variety of inflammatory and neurological diseases, including Alzheimer’s disease (AD). Therapies that block TNF-α proved ineffective as therapeutic for neurodegenerative diseases, which might be explained by the opposing functions of the two receptors of TNF (TNFRs): while TNFR1 stimulation mediates inflammatory and apoptotic pathways, activation of TNFR2 is related to neuroprotection. Despite the success of targeting TNFR2 in a transgenic AD mouse model, research that better mimics the human context is lacking. Objective: The aim of this study is to investigate whether stimulation of …TNFR2 with a TNFR2 agonist is effective in activating human TNFR2 and attenuating AD neuropathology in the J20xhuTNFR2-k/i mouse model. Methods: Transgenic amyloid-β (Aβ)-overexpressing mice containing a human extracellular TNFR2 domain (J20xhuTNFR2-k/i) were treated with a TNFR2 agonist (NewStar2). After treatment, different behavioral tests and immunohistochemical analysis were performed to assess different parameters, such as cognitive functions, plaque deposition, synaptic plasticity, or microglial phagocytosis. Results: Treatment with NewStar2 in J20xhuTNFR2-k/i mice resulted in a drastic decrease in plaque load and beta-secretase 1 (BACE-1) compared to controls. Moreover, TNFR2 stimulation increased microglial phagocytic activity, leading to enhanced Aβ clearance. Finally, activation of TNFR2 rescued cognitive impairments and improved synaptic plasticity. Conclusion: Our findings demonstrate that activation of human TNFR2 ameliorates neuropathology and improves cognitive functions in an AD mouse model. Moreover, our study confirms that the J20xhuTNFR2-k/i mouse model is suitable for testing human TNFR2-specific compounds. Show more
Keywords: Alzheimer’s disease, humanized mouse model, neurodegeneration, neuroinflammation, TNF, TNFR2 agonist
DOI: 10.3233/JAD-221230
Citation: Journal of Alzheimer's Disease, vol. 94, no. 3, pp. 977-991, 2023
Authors: Sandison, Heather | Callan, Nini G.L. | Rao, Rammohan V. | Phipps, John | Bradley, Ryan
Article Type: Research Article
Abstract: Background: Alzheimer’s disease (AD) is a chronic condition marked by progressive objective cognitive impairment (OCI). No monotherapy has substantially altered disease progression, suggesting the disease is multifactorial and may require a multimodal therapeutic approach. Objective: We sought to determine if cognitive function in a sample with OCI would change in response to a multimodal, individualized care plan based on potential contributors to cognitive decline (e.g., nutritional status, infection, etc.). Methods: Participants (n = 34) were recruited from the San Diego, CA area. The multimodal intervention included lifestyle changes (i.e., movement, diet, and stress management), nutraceutical support, and …medications. It was delivered pragmatically over four clinical visits, and outcome measures were gathered at four study visits, occurring at baseline, one, three, and six months (primary endpoint). Study participants received weekly phone calls for nutrition support throughout study participation. Outcome measures included the Cambridge Brain Sciences (CBS) battery, and the Montreal Cognitive Assessment (MoCA). Results: At 6 months, mean MoCA scores improved from 19.6±3.1 to 21.7±6.2 (p = 0.013). Significant improvement was observed in mean scores of the CBS memory domain [25.2 (SD 23.3) to 35.8 (SD 26.9); p < 0.01] and CBS overall composite cognition score [24.5 (SD 16.1) to 29.7 (SD 20.5); p = 0.02]. All CBS domains improved. Conclusion: Multiple measures of cognitive function improved after six months of intervention. Our results support the feasibility and impact of a multimodal, individualized treatment approach to OCI, warranting further research. Show more
Keywords: Alzheimer’s disease, Cambridge Brain Sciences, clinical trial, dementia, mild cognitive impairment, Montreal Cognitive Assessment
DOI: 10.3233/JAD-230004
Citation: Journal of Alzheimer's Disease, vol. 94, no. 3, pp. 993-1004, 2023
Authors: Mao, He-Jiao | Zhang, Jiang-Xia | Zhu, Wen-Cheng | Zhang, Hao | Fan, Xiang-Min | Han, Fei | Ni, Jun | Zhou, Li-Xin | Yao, Ming | Tian, Feng | Su, Ning | Zhu, Yi-Cheng
Article Type: Research Article
Abstract: Background: The mechanism of gait disorder in patients with cerebral small vessel disease (CSVD) remains unclear. Limited studies have compared the effect of cerebral microbleeds (CMBs) and lacunes on gait disturbance in CSVD patients in different anatomical locations. Objective: To investigate the relationship of quantitative gait parameters with varied anatomically located MRI imaging markers in patients with CSVD. Methods: Quantitative gait tests were performed on 127 symptomatic CSVD patients all with diffuse distributed white matter hyperintensities (WMHs). CMBs and lacunes in regard to anatomical locations and burdens were measured. The correlation between CSVD imaging markers and …gait parameters was evaluated using general linear model analysis. Results: Presence of CMBs was significantly associated with stride length (β= –0.098, p = 0.0272) and right step length (β= –0.054, p = 0.0206). Presence of CMBs in basal ganglia (BG) was significantly associated with stride length and step length. Presence of CMBs in brainstem was significantly associated with gait parameters including stride length, step length, step height, and step width. Presence of lacunes in brainstem was significantly associated with gait speed (β= –0.197, p = 0.0365). However, presence of lacunes in the other areas was not associated with worse gait performances. Conclusion: BG and brain stem located CMBs contributed to gait impairment in symptomatic CSVD patients. Show more
Keywords: Basal ganglia, brainstem, cerebral microbleeds, cerebral small vessel disease, quantitative gait parameters
DOI: 10.3233/JAD-230005
Citation: Journal of Alzheimer's Disease, vol. 94, no. 3, pp. 1005-1012, 2023
Authors: Falkenreck, Julia Maria | Kunkler, Michelle Celine | Ophey, Anja | Weigert, Hannah | Friese, Andrea | Jahr, Petra | Nelles, Gereon | Kalbe, Elke | Polidori, M. Cristina
Article Type: Research Article
Abstract: Background: Cognitive integrity is a fundamental driver of health. The exact structure of strategies against cognitive impairment is still under debate. Objective: To compare the short-term effects of a multicomponent cognitive training (BrainProtect) with those of general health counseling (GHC) on cognitive abilities and health-related quality of life (HRQoL) in healthy adults in Germany. Methods: In this parallel randomized controlled trial (RCT), 132 eligible cognitively healthy adults (age ≥50 years, Beck Depression Inventory ≤9/63; Montreal Cognitive Assessment ≥26/30) were randomized to either GHC (N = 72) or to intervention with BrainProtect (intervention group, IG; N = 60). IG participants received …8 weekly sessions of 90 min of the group-based BrainProtect program focusing on executive functions, concentration, learning, perception, and imagination, plus nutritional and physical exercise units. Before and after intervention, all participants underwent neuropsychological testing and HRQoL evaluation, blinded for pretest. Results: No significant training effect was observed for the primary endpoint of global cognition as assessed by CERAD-Plus-z Total Score (p = 0.113; η p2 = 0.023). Improvements in several cognitive subtests were shown in the IG (N = 53) compared to the GHC (N = 62) without adverse events. Differences reached significance for verbal fluency (p = 0.021), visual memory (p = 0.013), visuo-constructive functions (p = 0.034), and HRQoL (p = 0.009). Significance was lost after adjustment, though several changes were clinically relevant. Conclusion: BrainProtect did not significantly impact global cognition in this RCT. Nevertheless, the results of some outcomes indicate clinically meaningful changes, so that a strengthening of the cognitive performance by BrainProtect cannot be excluded. Further studies with larger sample size are needed to confirm these findings. Show more
Keywords: Alzheimer’s disease, cognitive integrity, cognitive training, healthy aging, prevention
DOI: 10.3233/JAD-220619
Citation: Journal of Alzheimer's Disease, vol. 94, no. 3, pp. 1013-1034, 2023
Authors: Chwa, Won Jong | Lopez, Oscar L. | Longstreth Jr, W.T. | Dai, Weiying | Raji, Cyrus A.
Article Type: Research Article
Abstract: Background: Aging and Alzheimer’s disease (AD) are characterized by widespread cortical and subcortical atrophy. Though atrophy patterns between aging and AD overlap considerably, regional differences between these two conditions may exist. Few studies, however, have investigated these patterns in large community samples. Objective: Elaborate longitudinal changes in brain morphometry in relation to aging and cognitive status in a well-characterized community cohort. Methods: Clinical and neuroimaging data were compiled from 72 participants from the Cardiovascular Health Study-Cognition Study, a community cohort of healthy aging and probable AD participants. Two time points were identified for each participant with …a mean follow-up time of 5.36 years. MRI post-processing, morphometric measurements, and statistical analyses were performed using FreeSurfer, Version 7.1.1. Results: Cortical volume was significantly decreased in the bilateral superior frontal, bilateral inferior parietal, and left superior parietal regions, among others. Cortical thickness was significantly reduced in the bilateral superior frontal and left inferior parietal regions, among others. Overall gray and white matter volumes and hippocampal subfields also demonstrated significant reductions. Cortical volume atrophy trajectories between cognitively stable and cognitively declined participants were significantly different in the right postcentral region. Conclusion: Observed volume reductions were consistent with previous studies investigating morphometric brain changes. Patterns of brain atrophy between AD and aging may be different in magnitude but exhibit widespread spatial overlap. These findings help characterize patterns of brain atrophy that may reflect the general population. Larger studies may more definitively establish population norms of aging and AD-related neuroimaging changes. Show more
Keywords: Aging, Alzheimer’s disease, cognition, cognitive dysfunction, neuroimaging
DOI: 10.3233/JAD-230080
Citation: Journal of Alzheimer's Disease, vol. 94, no. 3, pp. 1035-1045, 2023
Authors: Caillaud, Marie | Maltezos, Samantha | Hudon, Carol | Mellah, Samira | Belleville, Sylvie
Article Type: Research Article
Abstract: Background: Subjective cognitive decline (SCD) was proposed to identify older adults who complain about their memory but perform within a normal range on standard neuropsychological tests. Persons with SCD are at increased risk of dementia meaning that some SCD individuals experience subthreshold memory decline due to an underlying progression of Alzheimer’s disease (AD). Objective: Our main goal was to determine whether hippocampal volume and APOE4 , which represent typical AD markers, predict inter-individual differences in memory performance among SCD individuals and can be used to identify a meaningful clinical subgroup. Methods: Neuropsychological assessment, structural MRI, and …genetic testing for APOE4 were administered to one hundred and twenty-five older adults over the age of 65 from the CIMAQ cohort: 66 SCD, 29 individuals with mild cognitive impairment (MCI), and 30 cognitively intact controls (CTRLS). Multiple regression models were first used to identify which factor (hippocampal volume, APOE4 allele, or cognitive reserve) best predicted inter-individual differences in a Face-name association memory task within the SCD group. Results: Hippocampal volume was found to be the only and best predictor of memory performance. We then compared the demographic, clinical and cognitive characteristics of two SCD subgroups, one with small hippocampal volume (SCD/SH) and another with normal hippocampal volume (SCD/NH), with MCI and CTRLS. SCD/SH were comparable to MCI on neuropsychological tasks evaluating memory (i.e., test of delayed word recall), whereas SCD/NH were comparable to CTRLS. Conclusion: Thus, using hippocampal volume allows identification of an SCD subgroup with a cognitive profile consistent with a higher risk of conversion to AD. Show more
Keywords: Alzheimer’s disease, hippocampal volume, mild cognitive impairment, neuropsychology, subjective cognitive decline
DOI: 10.3233/JAD-230131
Citation: Journal of Alzheimer's Disease, vol. 94, no. 3, pp. 1047-1056, 2023
Authors: Hautecloque-Raysz, Geoffroy | Sellal, François | Bousiges, Olivier | Phillipi, Nathalie | Blanc, Frédéric | Cretin, Benjamin
Article Type: Research Article
Abstract: Background: The medium term outcome (over more than one year) of epileptic prodromal AD (epAD) patients treated with antiseizure medications (ASMs) is unknown in terms of seizure response, treatment tolerability, and cognitive and functional progression. Objective: To describe such medium term outcome over a mean of 5.1±2.1 years. Methods: We retrospectively compared 19 epAD patients with 16 non-epileptic prodromal AD (nepAD) patients: 1) at baseline for demographics, medical history, cognitive fluctuations (CFs), psychotropic medications, MMSE scores, visually rated hippocampal atrophy, CSF neurodegenerative biomarkers, and standard EEG recordings; 2) during follow-up (FU) for psychotropic medications, MMSE progression, …and conversion to dementia. In the epAD group, we analyzed baseline and FU types of seizures as well as each line of ASM with the corresponding efficacy and tolerability. Results: At baseline, the epAD group had more CFs than the nepAD group (58% versus 20%, p = 0.03); focal impaired awareness seizures were the most common type (n = 12, 63.1%), occurring at a monthly to quarterly frequency (89.5%), and were well controlled with monotherapy in 89.5% of cases (including 63.1% seizure-free individuals). During FU, treated epAD patients did not differ significantly from nepAD patients in MMSE progression or in conversion to dementia. Conclusion: Epilepsy is commonly controlled with ASMs over the medium term in epAD patients, with similar functional and cognitive outcomes to nepAD patients. Pathophysiologically, epilepsy is likely to be an ASM-modifiable cognitive aggravating factor at this stage of AD. Show more
Keywords: Alzheimer’s disease, antiseizure medications, cerebrospinal fluid, late-onset epilepsy, mild cognitive impairment
DOI: 10.3233/JAD-221197
Citation: Journal of Alzheimer's Disease, vol. 94, no. 3, pp. 1057-1074, 2023
Authors: Vossel, Keith
Article Type: Article Commentary
Abstract: Epileptic activity is known to exacerbate Alzheimer’s disease (AD) pathology and worsen disease course. However, few studies have assessed whether treating epileptic activity with antiseizure drugs (ASDs) can improve patient outcomes. The current study by Hautecloque-Raysz et al. shows that patients with prodromal AD and epilepsy (epAD) fare well with ASD treatment, achieving seizure control in a large majority of cases using low dosage ASDs in monotherapy. Compared to slowly progressing AD patients without epilepsy, treated epAD patients experienced a similarly slow cognitive decline. These results suggest that ASDs that suppress seizures can improve outcomes in AD patients with epileptic …activity. Show more
Keywords: Alzheimer’s disease, antiseizure drugs, epilepsy, epileptic activity, mild cognitive impairment
DOI: 10.3233/JAD-230613
Citation: Journal of Alzheimer's Disease, vol. 94, no. 3, pp. 1075-1077, 2023
Authors: Beauchet, Olivier | Matskiv, Jacqueline | Gaudreau, Pierrette | Allali, Gilles | Vaillant-Ciszewicz, Anne-Julie | Guerin, Olivier | Gros, Auriane
Article Type: Research Article
Abstract: Background: Frailty is associated with an increased risk of major neurocognitive disorders (MNCD). Objective: This study aims to compare the Fried physical model and the CARE deficit accumulation model for their association with incident major neurocognitive disorders (MNCD), and to examine how the addition of cognitive impairment to these frailty models impacts the incidence in community-dwelling older adults. Methods: A subset of community dwellers (n = 1,259) who participated in the “Quebec Longitudinal Study on Nutrition and Successful Aging” (NuAge) were selected in this Elderly population-based observational cohort study with 3 years of follow-up. Fried and CARE …frailty stratifications into robust, pre-frail and frail groups were performed using the NuAge baseline assessment. Incident MNCD (i.e., Modified Mini Mental State (3MS) score < 79/100 and Instrumental Activity Daily Living (IADL) score < 6/8) were collected each year over a 3-year follow-up period. Results: A greater association with incident MNCD of the CARE frail state was observed with an increased predictive value when combined with cognitive impairment in comparison to Fried’s one, the highest incidences being observed using the robust state as the reference. Results with the Fried frail state were more heterogenous, with no association with the frail state alone, whereas cognitive impairment alone showed the highest significant incidence. Conclusion: The association of the CARE frail state with cognitive impairment increased the predictive value of MNCD, suggesting that the CARE frailty model may be of clinical interest when screening MCND in the elderly population. Show more
Keywords: Aging, Alzheimer’s disease, cognitive impairment, cohort study, community-dwellers, frailty
DOI: 10.3233/JAD-230006
Citation: Journal of Alzheimer's Disease, vol. 94, no. 3, pp. 1079-1092, 2023
Authors: Chen, Weineng | Lin, Cha | Su, Fengjuan | Fang, Yingying | Liu, Ganqiang | Chen, Yu-Chian | Zhou, Xianbo | Yao, Xiaoli | Ashford, Curtis B. | Li, Feng | Ashford, J. Wesson | Fu, Qing-Ling | Pei, Zhong
Article Type: Research Article
Abstract: Background: Accessible measurements for the early detection of mild cognitive impairment (MCI) due to Alzheimer’s disease (AD) are urgently needed to address the increasing prevalence of AD. Objective: To determine the benefits of a composite MemTrax Memory Test and AD-related blood biomarker assessment for the early detection of MCI-AD in non-specialty clinics. Methods: The MemTrax Memory Test and Montreal Cognitive Assessment were administered to 99 healthy seniors with normal cognitive function and 101 patients with MCI-AD; clinical manifestation and peripheral blood samples were collected. We evaluated correlations between the MemTrax Memory Test and blood biomarkers using …Spearman’s rank correlation analyses and then built discrimination models using various machine learning approaches that combined the MemTrax Memory Test and blood biomarker results. The models’ performances were assessed according to the areas under the receiver operating characteristic curve. Results: The MemTrax Memory Test and Montreal Cognitive Assessment areas under the curve for differentiating patients with MCI-AD from the healthy controls were similar. The MemTrax Memory Test strongly correlated with phosphorylated tau 181 and amyloid-β42/40 . The area under the curve for the best composite MemTrax Memory Test and blood biomarker model was 0.975 (95% confidence interval: 0.950–0.999). Conclusion: Combining MemTrax Memory Test and blood biomarker results is a promising new technique for the early detection of MCI-AD. Show more
Keywords: Alzheimer’s disease, biomarkers, cognitive dysfunction, neuropsychological tests
DOI: 10.3233/JAD-230182
Citation: Journal of Alzheimer's Disease, vol. 94, no. 3, pp. 1093-1103, 2023
Authors: Belan, Ariella Fornachari Ribeiro | Pais, Marcos Vasconcelos | Camargo, Marina von Zuben de Arruda | Sant’Ana, Livea Carla Fidalgo Garcêz | Radanovic, Marcia | Forlenza, Orestes Vicente
Article Type: Research Article
Abstract: Background: The assessment of language changes associated with visual search impairment can be an important diagnostic tool in the Alzheimer’s disease (AD) continuum. Objective: Investigate the performance of an eye-tracking assisted visual inference language task in differentiating subjects with mild cognitive impairment (MCI) or AD dementia from cognitively unimpaired older adults (controls). Methods: We assessed a group of 95 older adults (49 MCI, 18 mild dementia due to AD, and 28 controls). The subjects performed the same task under multiple experimental conditions which generate correlated responses that need to be taken into account. Thus, we performed …a non-parametric repeated measures ANOVA model for verbal answers, and a linear mixed model (LMM) or its generalized version for the analysis of eye tracking variables. Results: Significant differences were found in verbal answers across all diagnostic groups independently of type of inference, i.e., logic or pragmatic. Also, eye-tracking parameters were able to discriminate AD from MCI and controls. AD patients did more visits to challenge stimulus (Control-AD, –0.622, SE = 0.190, p = 0.004; MCI-AD, –0.514, SE = 0.173, p = 0.011), more visits to the correct response stimulus (Control-AD, –1.363, SE = 0.383, p = 0.002; MCI-AD, –0.946, SE = 0.349, p = 0.022), more fixations on distractors (Control-AD, –4.580, SE = 1.172, p = 0.001; MCI-AD, –2.940, SE = 1.070, p = 0.020), and a longer time to first fixation on the correct response stimulus (Control-AD, –0.622, SE = 0.190, p = 0.004; MCI-AD, –0.514, SE = 0.173, p = 0.011). Conclusion: The analysis of oculomotor behavior along with language assessment protocols may increase the sensitivity for detection of subtle deficits in the MCI-AD continuum, representing an important diagnostic tool. Show more
Keywords: Alzheimer’s disease, cognitive impairment, eye movement, eye-tracking, visual inferences, visual search impairment
DOI: 10.3233/JAD-230250
Citation: Journal of Alzheimer's Disease, vol. 94, no. 3, pp. 1105-1119, 2023
Authors: Kulminski, Alexander M. | Feng, Fan | Loiko, Elena | Nazarian, Alireza | Loika, Yury | Culminskaya, Irina
Article Type: Research Article
Abstract: Background: The lack of efficient preventive interventions against Alzheimer’s disease (AD) calls for identifying efficient modifiable risk factors for AD. As diabetes shares many pathological processes with AD, including accumulation of amyloid plaques and neurofibrillary tangles, insulin resistance, and impaired glucose metabolism, diabetes is thought to be a potentially modifiable risk factor for AD. Mounting evidence suggests that links between AD and diabetes may be more complex than previously believed. Objective: To examine the pleiotropic architecture of AD and diabetes mellitus (DM). Methods: Univariate and pleiotropic analyses were performed following the discovery-replication strategy using individual-level data …from 10 large-scale studies. Results: We report a potentially novel pleiotropic NOTCH2 gene, with a minor allele of rs5025718 associated with increased risks of both AD and DM. We confirm previously identified antagonistic associations of the same variants with the risks of AD and DM in the HLA and APOE gene clusters. We show multiple antagonistic associations of the same variants with AD and DM in the HLA cluster, which were not explained by the lead SNP in this cluster. Although the ɛ 2 and ɛ 4 alleles played a major role in the antagonistic associations with AD and DM in the APOE cluster, we identified non-overlapping SNPs in this cluster, which were adversely and beneficially associated with AD and DM independently of the ɛ 2 and ɛ 4 alleles. Conclusion: This study emphasizes differences and similarities in the heterogeneous genetic architectures of AD and DM, which may differentiate the pathogenic mechanisms of these diseases. Show more
Keywords: Alzheimer’s disease, apolipoprotein E gene, diabetes, major histocompatibility complex, pleiotropy
DOI: 10.3233/JAD-230397
Citation: Journal of Alzheimer's Disease, vol. 94, no. 3, pp. 1121-1132, 2023
Authors: Jeong, Seong Ho | Cha, Jungho | Jung, Jin Ho | Yun, Mijin | Sohn, Young H. | Chung, Seok Jong | Lee, Phil Hyu
Article Type: Research Article
Abstract: Background: Clinical significance of additional occipital amyloid-β (Aβ) plaques in Alzheimer’s disease (AD) remains unclear. Objective: In this study, we investigated the effect of regional Aβ deposition on cognition in patients on the AD continuum, especially in the occipital region. Methods: We retrospectively reviewed the medical record of 208 patients with AD across the cognitive continuum (non-dementia and dementia). Multivariable linear regression analyses were performed to determine the effect of regional Aβ deposition on cognitive function. A linear mixed model was used to assess the effect of regional deposition on longitudinal changes in Mini-Mental State Examination …(MMSE) scores. Additionally, the patients were dichotomized according to the occipital-to-global Aβ deposition ratio (ratio ≤1, Aβ-OCC– group; ratio >1, Aβ-OCC+ group), and the same statistical analyses were applied for between-group comparisons. Results: Regional Aβ burden itself was not associated with baseline cognitive function. In terms of Aβ-OCC group effect, the Aβ-OCC+ group exhibited a poorer cognitive performance on language function compared to the Aβ-OCC– group. High Aβ retention in each region was associated with a rapid decline in MMSE scores, only in the dementia subgroup. Additionally, Aβ-OCC+ individuals exhibited a faster annual decline in MMSE scores than Aβ-OCC– individuals in the non-dementia subgroup (β= –0.77, standard error [SE] = 0.31, p = 0.013). Conclusion: The present study demonstrated that additional occipital Aβ deposition was associated with poor baseline language function and rapid cognitive deterioration in patients on the AD continuum. Show more
Keywords: Alzheimer’s disease, amyloid, cognition, occipital lobe, prognosis
DOI: 10.3233/JAD-230187
Citation: Journal of Alzheimer's Disease, vol. 94, no. 3, pp. 1133-1144, 2023
Authors: Mobasheri, Kamelia | Zaefizadeh, Mohammad | Ghobeh, Maryam | Eidi, Akram
Article Type: Research Article
Abstract: Background: Alzheimer’s disease (AD) is the most common type of dementia. The drugs introduced for this disease have many side effects and limitations in use, so the production of a suitable herbal medicine to cure AD patients is essential. Objective: The aim of this research is to make a magnetic neuropeptide nano shuttle as a targeted carrier for the transfer of quercetin to the brains of AD model rats. Methods: In this work, a magnetic quercetin-neuropeptide nanocomposite (MQNPN) was fabricated and administered to the rat’s brain by the shuttle drug of the Margatoxin scorpion venom neuropeptide, …and will be a prospect for targeted drug delivery in AD. The MQNPN has been characterized by FTIR, spectroscopy, FE-SEM, XRD, and VSM. Investigations into the efficacy of MQNPN, MTT, and real Time PCR for MAPT and APP genes expression were performed. After 7 days treatment with Fe3 O4 (Ctr) and MQNPN treatment in AD rat, superoxide dismutase activity and quercetin in blood serum and brain was detected. Hematoxylin-Eosin staining was applied for histopathological analysis. Results: Analysis of data showed that MQNPN increased the activity of superoxide dismutase. The histopathology results of the hippocampal region of AD rats also confirmed their improvement after treatment with MQNPN. MQNPN treatment caused a significant decrease in the relative expression of MAPT and APP genes. Conclusion: MQNPN is a suitable carrier for the transfer of quercetin to the rat hippocampus, and has a significant effect in reducing AD symptoms in terms of histopathology, behavioral testing, and changing the expression of AD-related genes. Show more
Keywords: Alzheimer’s disease, nano-drug shuttle system, nanocomposite, neuropeptide, quercetin
DOI: 10.3233/JAD-221095
Citation: Journal of Alzheimer's Disease, vol. 94, no. 3, pp. 1145-1155, 2023
Authors: Araujo-Menendez, Carlos E.E. | Saelzler, Ursula G. | Stickel, Ariana M. | Sundermann, Erin E. | Banks, Sarah J. | Paipilla, Andrea | Barnes, McKinna L. | Panizzon, Matthew S.
Article Type: Research Article
Abstract: Background: Race/ethnicity is associated with differences in reproductive history and cognition individually, yet it remains an understudied factor in the relationship between parity and later-life cognition. Objective: To evaluate if the association between parity and cognition differs between racial/ethnic groups. Methods: Participants included 778 older, postmenopausal women from the Health and Nutrition Examination Survey (Latina: n = 178, Non-Latino Black [NLB]: n = 169, Non-Latino White [NLW]: n = 431) who self-reported at least one birth. Cognitive outcomes included working memory, learning memory, and verbal fluency. Covariates included age, education, cardiovascular and other reproductive health factors, adult socioeconomic status …(SES) and depressive symptoms. We fit a series of linear models to examine a) whether parity was associated with cognitive functioning, b) if this association varied by race/ethnicity through parity by race/ethnicity interactions, and c) individual parity with cognition associations stratified by race/ethnicity. Results: In the full sample, parity was significantly negatively associated with Digit Symbol Substitution Test (DSST) performance (b = –0.70, p = 0.024) but not Animal Fluency or word-list learning and memory. Tests of race/ethnicity-by-parity interactions were not statistically significant (ps > 0.05). However, stratified analyses by race/ethnicity showed a differential effect of parity on DSST performance, such that parity was significantly negatively associated with DSST performance (b = –1.66, p = 0.007) among Latinas but not in NLWs (b = –0.16, p = 0.74) or NLBs (b = –0.81, p = 0.191). Conclusion: Among Latina, but not NLB or NLW women, greater parity was associated with worse processing speed/executive functioning later in life. Further research is needed to understand the mechanisms driving racial/ethnic differences. Show more
Keywords: Alzheimer’s disease, cognition, cross-cultural research, pregnancy, reproductive health
DOI: 10.3233/JAD-221210
Citation: Journal of Alzheimer's Disease, vol. 94, no. 3, pp. 1157-1168, 2023
Authors: Audronyte, Egle | Pakulaite-Kazliene, Gyte | Sutnikiene, Vaiva | Kaubrys, Gintaras
Article Type: Research Article
Abstract: Background: Olfactory dysfunction is an early symptom of Alzheimer’s disease (AD). However, olfactory tests are rarely performed in clinical practice because their diagnostic efficacy in detecting early AD is unclear. Objective: To investigate odor discrimination in patients with early AD and the efficacy of olfactory discrimination tests in differentiating these patients from subjects with normal cognition (CN). Methods: Thirty patients each with mild dementia due to AD (MD-AD) and mild cognitive impairment due to AD (MCI-AD) and 30 older subjects with CN were enrolled. All participants underwent cognitive examinations (CDR, MMSE, ADAS-Cog 13, and verbal fluency) …and odor discrimination tests (Sniffin’ Sticks test, Burghart®, Germany). Results: The MD-AD group achieved significantly worse scores on the olfactory discrimination test than the MCI-AD group, and the MCI-AD group achieved significantly worse results than the CN group (p < 0.05). A cut-off score of≤10 had a diagnostic accuracy of 94.44% (95% CI, 87.51–98.17%) in differentiating patients with MCI-AD/MD-AD from subjects with CN and of 91.67% (95% CI, 81.61–97.24%) in differentiating those with MCI-AD from subjects with CN. Our multinomial logistic regression model with demographic data and ADAS-Cog 13 scores as predictor variables correctly classified 82.2% of the cases (CN, 93.3%; MC-AD, 70%; MD-AD, 83.3%); on adding the olfactory discrimination score to the model, the percentage increased to 92.2% (CN, 96.7%; MCI-AD, 86.7%; MD-AD, 93.3%). Conclusion: Odor discrimination is impaired in cases of early AD and continues to deteriorate as the disease progresses. The olfactory discrimination test showed good diagnostic efficacy in detecting early AD. Show more
Keywords: Alzheimer’s disease, mild cognitive impairment, olfaction, olfactory impairment
DOI: 10.3233/JAD-230077
Citation: Journal of Alzheimer's Disease, vol. 94, no. 3, pp. 1169-1178, 2023
Authors: Alves, Suélen Santos | de Oliveira, José Antônio Cortes | Lazarini-Lopes, Willian | Servilha-Menezes, Gabriel | Grigório-de-Sant’Ana, Mariana | Del Vecchio, Flavio | Mazzei, Rodrigo Focosi | Sousa Almeida, Sebastião | da Silva Junior, Rui Milton Patrício | Garcia-Cairasco, Norberto
Article Type: Research Article
Abstract: Background: Alzheimer’s disease (AD) is a neurodegenerative and progressive disorder with no cure and constant failures in clinical trials. The main AD hallmarks are amyloid-β (Aβ) plaques, neurofibrillary tangles, and neurodegeneration. However, many other events have been implicated in AD pathogenesis. Epilepsy is a common comorbidity of AD and there is important evidence indicating a bidirectional link between these two disorders. Some studies suggest that disturbed insulin signaling might play an important role in this connection. Objective: To understand the effects of neuronal insulin resistance in the AD-epilepsy link. Methods: We submitted the streptozotocin (STZ) induced …rat AD Model (icv-STZ AD) to an acute acoustic stimulus (AS), a known trigger of seizures. We also assessed animals’ performance in the memory test, the Morris water maze and the neuronal activity (c-Fos protein) induced by a single audiogenic seizure in regions that express high levels of insulin receptors. Results: We identified significant memory impairment and seizures in 71.43% of all icv-STZ/AS rats, in contrast to 22.22% of the vehicle group. After seizures, icv-STZ/AS rats presented higher number of c-Fos immunopositive cells in hippocampal, cortical, and hypothalamic regions. Conclusion: STZ may facilitate seizure generation and propagation by impairment of neuronal function, especially in regions that express high levels of insulin receptors. The data presented here indicate that the icv-STZ AD model might have implications not only for AD, but also for epilepsy. Finally, impaired insulin signaling might be one of the mechanisms by which AD presents a bidirectional connection to epilepsy. Show more
Keywords: Acoustic stimulus, Alzheimer’s disease, epilepsy, insulin resistance, memory, seizures, streptozotocin
DOI: 10.3233/JAD-230153
Citation: Journal of Alzheimer's Disease, vol. 94, no. 3, pp. 1179-1196, 2023
Authors: Castelblanco-Toro, Sandra Milena | Jurado-Delgado, Janeth | Meneses-Bernal, Juan Felipe | Santacruz-Escudero, José Manuel | Santamaria-García, Hernando
Article Type: Research Article
Abstract: Background: Fear of falling (FoF) is a condition associated with falls, multi-morbidity, and functional impairment. To date it remains unknow which clinical, somatic, socio-demographic, behavioral, and emotional factors are associated with FoF and how these factors interact in people with Alzheimer’s disease (AD) and behavioral variant frontotemporal dementia (bvFTD). Objective: Identify the association of FoF with clinical, socio-demographic, and neuropsychiatric factors in patients with AD and bvFTD. Methods: We evaluated 98 participants, 58 with AD and 40 with bvFTD at mild or moderate stages and assess FoF using the Falls Efficacy Scale-International. Additionally, we analyzed cognitive, …physical performance variables, functional impairment, and affective and behavioral symptoms associated with FoF using standardized scales and a regression model analysis. Results: The prevalence of FoF in AD and bvFTD was 51% and 40%, respectively. In the AD group, physical performance [F (3, 53) = 4.318, p = 0.009], the behavioral symptoms model [F (19, 38) = 3.314, p = 0.001], and the anxiety model [F (1, 56) = 13.4, p ≤0.01] showed statistically significant values. In addition, the presence of hallucinations assessed with the Neuropsychiatric Inventory and social behavior assessed with the Mild Behavioral Impairment Checklist were significant. In contrast, in the bvFTD group, a homologous group of models was evaluated but we did not find any significant results. Conclusion: FoF in people with AD was related to physical performance, neuropsychiatric symptoms such as apathy and hallucinations, and affective symptoms such as anxiety. However, this pattern was not seen in the bvFTD group, and therefore further studies are required. Show more
Keywords: Alzheimer’s disease, behavioral symptoms, fear of falling, frontotemporal dementia, physical performance
DOI: 10.3233/JAD-230266
Citation: Journal of Alzheimer's Disease, vol. 94, no. 3, pp. 1197-1207, 2023
Authors: Zhang, Jie | Gao, Shang | Liu, Wei
Article Type: Research Article
Abstract: Background: There is a close association between Alzheimer’s disease (AD) and circadian rhythms, and neuroinflammatory-related pathways are associated with both interactions. Objective: To reveal the relationship between circadian rhythm (CR) and AD at the level of genes, pathways, and molecular functions through bioinformatics. Methods: We analyzed the differential genes between AD and control groups in GSE122063 and found the important gene modules; obtained CR-related genes from GeenCard database; used Venn 2.1 database to obtain the intersection of genes of AD important modules with CR-related genes; and used STRING database and Cytoscape 3.7.1 to construct the gene …protein-protein interaction network. The MCODE plugin was used to screen pivotal genes and analyze their differential expression. We trranslated with www.DeepL.com/Translator (free version) to obtain transcriptional regulatory relationships from the TRRUST database and construct a hub gene-transcription factor relationship network. Results: A total of 42 common genes were screened from AD and CR genes, mainly involving signaling pathways such as neuroactive ligand-receptor interactions. A total of 10 pivotal genes were screened from the common genes of CR and AD, which were statistically significant in the comparison of AD and control groups (p < 0.001), and ROC analysis showed that all these pivotal genes had good diagnostic significance. A total of 36 TFs of pivotal genes were obtained. Conclusion: We identified AD- and CR-related signaling pathways and 10 hub genes and found strong associations between these related genes and biological processes such as inflammation. Show more
Keywords: Alzheimer’s disease, bioinformatics, circadian rhythm, hub genes
DOI: 10.3233/JAD-230177
Citation: Journal of Alzheimer's Disease, vol. 94, no. 3, pp. 1209-1224, 2023
Authors: Sorrentino, Federica | Fenoglio, Chiara | Sacchi, Luca | Serpente, Maria | Arighi, Andrea | Carandini, Tiziana | Arosio, Beatrice | Ferri, Evelyn | Arcaro, Marina | Visconte, Caterina | Rotondo, Emanuela | Scarpini, Elio | Galimberti, Daniela
Article Type: Research Article
Abstract: Background: The longevity gene Klotho (KL ) was recently associated with neurodegenerative diseases including Alzheimer’s disease (AD). Its role in the brain has not been completely elucidated, although evidence suggests that KL-VS heterozygosity is associated with a reduced risk of AD in Apolipoprotein E ɛ 4 carriers. Conversely, no data about genetic association with frontotemporal dementia (FTD) are available so far. Objective: To investigate the involvement of KL in AD and FTD by the determination of the genetic frequency of KL-VS variant and the expression analysis of KL gene. Methods: A population consisting …of 438 patients and 240 age-matched controls was enrolled for the study. KL-VS and APOE genotypes were assessed by allelic discrimination through a QuantStudio 12K system. KL gene expression analysis was performed in a restricted cohort of patients consisting of 43 AD patients, 41 FTD patients and 19 controls. KL gene expression was assessed in peripheral blood mononuclear cells with specific TaqMan assay. Statistical analysis was performed using GraphPad 9 Prims software. Results: KL-VS frequency was comparable to the ones found in literature and no differences were found in both allelic and genotypic frequencies between patients and controls were found. Conversely, KL expression levels were significantly lower in AD and FTD patients compared with controls (mean fold regulation – 4.286 and – 6.561 versus controls in AD and FTD, respectively, p = 0.0037). Conclusion: This is the first study investigating KL in FTD. We showed a decreased expression of the gene in AD and FTD, independent of the genotype, suggesting a role of Klotho in common steps during neurodegeneration. Show more
Keywords: Alzheimer’s disease, expression, frontotemporal dementia, Klotho, neurodegeneration
DOI: 10.3233/JAD-230322
Citation: Journal of Alzheimer's Disease, vol. 94, no. 3, pp. 1225-1231, 2023
Authors: Kang, Jae Myeong | Shin, Jeong-Hyeon | Kim, Woo-Ram | Seo, Seongho | Seo, Haeun | Lee, Sang-Yoon | Park, Kee Hyung | Na, Duk L. | Okamura, Nobuyuki | Seong, Joon-Kyoung | Noh, Young
Article Type: Research Article
Abstract: Background: Little is known regarding the differential effects of the apolipoprotein E (APOE ) ɛ 4 on the regional topography of amyloid and tau in patients with both early-onset (EOAD) and late-onset Alzheimer’s disease (LOAD). Objective: To compare the distribution and association of tau, amyloid, and cortical thickness among groups classified by the presence of APOE ɛ 4 allele and onset age. Methods: A total of 165 participants including 54 EOAD patients (29 ɛ 4-; 25 ɛ 4+), 45 LOAD patients (21 ɛ 4-; 24 ɛ 4+), and 66 age-matched controls underwent 3T MRI, 18 …F-THK5351 (THK) and 18 F-flutemetamol (FLUTE) PET scans, APOE genotyping, and neuropsychological tests. Data for voxel-wise and standardized uptake values from PET scans were analyzed in the context of APOE and age at onset. Results: EOAD ɛ 4- patients showed greater THK retention in the association cortices, whereas their EOAD ɛ 4+ counterparts had more retention in medial temporal areas. THK topography of LOAD ɛ 4+ was similar to EOAD ɛ 4 + . THK correlated positively with FLUTE and conversely with mean cortical thickness, being lowest in EOAD ɛ 4-, highest in LOAD ɛ 4-, and modest in ɛ 4+ groups. Even in the APOE ɛ 4+ groups, THK tended to correlate with FLUTE and mean cortical thickness in the inferior parietal region in EOAD and in the medial temporal region in LOAD. LOAD ɛ 4- manifested with prevalent small vessel disease markers and the lowest correlation between THK retention and cognition. Conclusion: Our observations suggest the differential effects of the APOE ɛ 4 on the relationship between tau and amyloid in EOAD and LOAD. Show more
Keywords: Alzheimer’s disease, amyloid, APOE, early-onset Alzheimer’s disease, tau
DOI: 10.3233/JAD-230339
Citation: Journal of Alzheimer's Disease, vol. 94, no. 3, pp. 1233-1246, 2023
Authors: D’Cunha, Nathan M. | Holloway, Helen | Gibson, Diane | Thompson, Jane | Bail, Kasia | Kurrle, Susan | Day, Sally | Olson, James | Smith, Nicole | Clarke, Heather | Buckley, Charise | Isbel, Stephen
Article Type: Research Article
Abstract: Background: Small-scale models of dementia care are a potential solution to deinstitutionalize residential aged care and have been associated with improved resident outcomes, including quality of life and reduced hospitalizations for people living with dementia. Objective: This study aimed to generate strategies and ideas on how homes for people living with dementia in a village setting within a suburban community, could be designed and function without external boundaries. In particular, how could residents of the village and members of the surrounding community access and engage safely and equitably so that interpersonal connections might be fostered? Methods: …Twenty-one participants provided an idea for discussion at three Nominal Group Technique workshops, including people living with dementia, carers or former carers, academics, researchers, and clinicians. Discussion and ranking of ideas were facilitated in each workshop, and qualitative data were analyzed thematically. Results: All three workshops highlighted the importance of a surrounding community invested in the village; education and dementia awareness training for staff, families, services, and the community; and the necessity for adequately and appropriately trained staff. An appropriate mission, vision, and values of the organization providing care were deemed essential to facilitate an inclusive culture that promotes dignity of risk and meaningful activities. Conclusion: These principles can be used to develop an improved model of residential aged care for people living with dementia. In particular, inclusivity, enablement, and dignity of risk are essential principles for residents to live meaningful lives free from stigma in a village without external boundaries. Show more
Keywords: Alzheimer’s disease, aged care, co-design, dementia, dementia care, dementia village, geriatrics, group homes, nursing, nursing homes
DOI: 10.3233/JAD-230368
Citation: Journal of Alzheimer's Disease, vol. 94, no. 3, pp. 1247-1263, 2023
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