Journal of Alzheimer's Disease - Volume 91, issue 3

Authors: Cao, Ke | Bay, Allison A. | Hajjar, Ihab | Wharton, Whitney | Goldstein, Felicia | Qiu, Deqiang | Prusin, Todd | McKay, J. Lucas | Perkins, Molly M. | Hackney, Madeleine E.

Article Type: Research Article

Abstract: Background: Functional decline in Alzheimer’s disease (AD) is impacted by impaired ability to integrate and modulate complex cognitive and motor abilities, commonly known as motor-cognitive integration. Impaired motor-cognitive integration occurs in the early stages of AD, prodromal AD (pAD), and may precede other symptoms. Combined motor and cognitive training have been recommended for people with pAD and need to be better researched. Our data suggest that partnered rhythmic rehabilitation (PRR) improves motor-cognitive integration in older adults with cognitive impairment. PRR is an ideal intervention to simultaneously target cardiovascular, social, and motor-cognitive domains important to AD. Objective/Methods: We propose …to conduct a 1-year Phase II, single-blind randomized controlled trial using PRR in 66 patients with pAD. Participants will be assigned to three months of biweekly sessions, followed by nine months of weekly sessions of PRR or group walking (WALK) with 1 : 1 allocation. Group walking in the control group will allow us to compare physical exercise alone versus the added benefit of the cognitively engaging elements of PRR. Results/Conclusion: Using an intent-to-treat approach, this innovative pilot study will 1) Determine acceptability, safety, tolerability, and satisfaction with PRR; 2) Compare efficacy of PRR versus WALK for improving motor-cognitive integration and identify the most sensitive endpoint for a Phase III trial from a set of motor-cognitive, volumetric MRI, and cognitive measures. The study will additionally explore potential neural, vascular, and inflammatory mechanisms by which PRR affects pAD to derive effect size of these intermediary measures and aid us in estimating sample size for a future trial. Show more

Keywords: Dance therapy, exercise, multitasking behavior, neuroprotection

DOI: 10.3233/JAD-220783

Citation: Journal of Alzheimer's Disease, vol. 91, no. 3, pp. 1019-1033, 2023

Authors: Dai, Wen-Zhuo | Liu, Lu | Zhu, Meng-Zhuo | Lu, Jing | Ni, Jian-Ming | Li, Rong | Ma, Tao | Zhu, Xi-Chen

Article Type: Research Article

Abstract: Background: Alzheimer’s disease (AD) is an increasingly common type of dementia. Apolipoprotein E (APOE ) gene is a strong risk factor for AD. Objective: Here, we explored alterations in grey matter structure (GMV) and networks in AD, as well as the effects of the APOE ɛ 4 allele on neuroimaging regions based on structural magnetic resonance imaging (sMRI). Methods: All subjects underwent an sMRI scan. GMV and cortical thickness were calculated using voxel-based morphological analysis, and structural networks were constructed based on graph theory analysis to compare differences between AD and normal controls. …Results: The volumes of grey matter in the bilateral inferior temporal gyrus, right middle temporal gyrus, right inferior parietal lobule, right limbic lobe, right frontal lobe, left anterior cingulate gyrus, and bilateral olfactory cortex of patients with AD were significantly decreased. The cortical thickness in patients with AD was significantly reduced in the left lateral occipital lobe, inferior parietal lobe, orbitofrontal region, precuneus, superior parietal gyrus, right precentral gyrus, middle temporal gyrus, pars opercularis gyrus, insular gyrus, superior marginal gyrus, bilateral fusiform gyrus, and superior frontal gyrus. In terms of local properties, there were significant differences between the AD and control groups in these areas, including the right bank, right temporalis pole, bilateral middle temporal gyrus, right transverse temporal gyrus, left postcentral gyrus, and left parahippocampal gyrus. Conclusion: There were significant differences in the morphological and structural covariate networks between AD patients and healthy controls under APOE ɛ 4 allele effects. Show more

Keywords: Alzheimer’s disease, apolipoprotein E, cortical thickness, grey matter volume, structural covariate network, structural magnetic resonance imaging

DOI: 10.3233/JAD-220877

Citation: Journal of Alzheimer's Disease, vol. 91, no. 3, pp. 1035-1048, 2023

Authors: Caselli, Richard J. | Chen, Yinghua | Chen, Kewei | Bauer III, Robert J. | Locke, Dona E.C. | Woodruff, Bryan K.

Article Type: Research Article

Abstract: Background: Older age is a major risk factor for severe COVID-19 disease which has been associated with a variety of neurologic complications, both acutely and chronically. Objective: We sought to determine whether milder COVID-19 disease in older vulnerable individuals is also associated with cognitive and behavioral sequelae. Methods: Neuropsychological, behavioral, and clinical outcomes before and after contracting COVID-19 disease, were compared in members of two ongoing longitudinal studies, the Arizona APOE Cohort and the national Alzheimer’s Disease Research Center (ADRC). Results: 152 APOE and 852 ADRC cohort members, mean age overall roughly 70 years, …responded to a survey that indicated 21 APOE and 57 ADRC members had contracted COVID-19 before their ensuing (post-COVID) study visit. The mean interval between test sessions that preceded and followed COVID was 2.2 years and 1.2 years respectively for the APOE and ADRC cohorts. The magnitude of change between the pre and post COVID test sessions did not differ on any neuropsychological measure in either cohort. There was, however, a greater increase in informant (but not self) reported cognitive change in the APOE cohort (p  = 0.018), but this became nonsignificant after correcting for multiple comparisons. Conclusion: Overall members of both cohorts recovered well despite their greater age-related vulnerability to more severe disease. Show more

Keywords: Alzheimer’s disease, APOE, cognitive aging, COVID-19, mild cognitive impairment

DOI: 10.3233/JAD-220435

Citation: Journal of Alzheimer's Disease, vol. 91, no. 3, pp. 1049-1058, 2023

Authors: Morys, Filip | Potvin, Olivier | Zeighami, Yashar | Vogel, Jacob | Lamontagne-Caron, Rémi | Duchesne, Simon | Dagher, Alain

Article Type: Research Article

Abstract: Background: Excess weight in adulthood leads to health complications such as diabetes, hypertension, or dyslipidemia. Recently, excess weight has also been related to brain atrophy and cognitive decline. Reports show that obesity is linked with Alzheimer’s disease (AD)-related changes, such as cerebrovascular damage or amyloid-β accumulation. However, to date no research has conducted a direct comparison between brain atrophy patterns in AD and obesity. Objective: Here, we compared patterns of brain atrophy and amyloid-β/tau protein accumulation in obesity and AD using a sample of over 1,300 individuals from four groups: AD patients, healthy controls, obese otherwise healthy individuals, …and lean individuals. Methods: We age- and sex-matched all groups to the AD-patients group and created cortical thickness maps of AD and obesity. This was done by comparing AD patients with healthy controls, and obese individuals with lean individuals. We then compared the AD and obesity maps using correlation analyses and permutation-based tests that account for spatial autocorrelation. Similarly, we compared obesity brain maps with amyloid-β and tau protein maps from other studies. Results: Obesity maps were highly correlated with AD maps but were not correlated with amyloid-β/tau protein maps. This effect was not accounted for by the presence of obesity in the AD group. Conclusion: Our research confirms that obesity-related grey matter atrophy resembles that of AD. Excess weight management could lead to improved health outcomes, slow down cognitive decline in aging, and lower the risk for AD. Show more

Keywords: Alzheimer’s disease, grey matter, neurodegeneration, obesity

DOI: 10.3233/JAD-220535

Citation: Journal of Alzheimer's Disease, vol. 91, no. 3, pp. 1059-1071, 2023

Authors: Eruysal, Emily | Ravdin, Lisa | Zhang, Cenai | Kamel, Hooman | Iadecola, Costantino | Ishii, Makoto

Article Type: Research Article

Abstract: Background: Plasminogen activator inhibitor-1 (PAI-1), an inhibitor of fibrinolysis that is associated with adiposity, has been implicated in Alzheimer’s disease (AD) pathogenesis. However, whether circulating PAI-1 levels are altered during preclinical AD remains unclear. Objective: To measure plasma PAI-1 levels in cognitively normal cerebrospinal fluid (CSF) AD biomarker positive and biomarker negative participants and to examine the association of plasma PAI-1 levels with CSF AD biomarkers and Mini-Mental State Examination (MMSE) scores. Methods: In this cross-sectional study, plasma PAI-1 levels were measured in 155 cognitively normal (Clinical Dementia Rating, CDR 0) non-obese older adults. 29 men …and 26 women were classified as preclinical AD by previously established CSF tau/Aβ42 criteria. All analyses were sex stratified due to reported sex differences in PAI-1 expression. Results: Plasma PAI-1 levels were associated with body mass index (BMI) but not age in men and women. In men, plasma PAI-1 levels and BMI were lower in preclinical AD compared to control. Plasma PAI-1 levels were positively associated with CSF amyloid-β42 (Aβ42) and CSF Aβ42/Aβ40 and negatively associated with CSF tau/Aβ42, while BMI was positively associated with CSF Aβ42 and negatively associated with CSF p-tau181 and CSF tau/Aβ42. In women, plasma PAI-1 levels and BMI were similar between preclinical AD and control and were not associated with CSF AD biomarkers. For men and women, plasma PAI-1 levels and BMI were not associated with MMSE scores. Conclusion: These findings suggest that there are significant sex differences in the systemic metabolic changes seen in the preclinical stage of AD. Show more

Keywords: Adipokines, Alzheimer’s disease, amyloid beta-peptides, body weight, body mass index, biomarker, immunoassay, PAI-1, sexual dimorphism, tau proteins

DOI: 10.3233/JAD-220686

Citation: Journal of Alzheimer's Disease, vol. 91, no. 3, pp. 1073-1083, 2023

Authors: Gong, Hong-Jian | Tang, Xingyao | Chai, Yin-He | Qiao, Yu-Shun | Xu, Hui | Patel, Ikramulhaq | Zhang, Jin-Yan | Simó, Rafael | Zhou, Jian-Bo

Article Type: Research Article

Abstract: Background: Obesity has been linked to cognitive impairment. However, how changes in body mass index (BMI) over the life course influence cognitive function remains unclear. Objective: The influence of distinct weight-change patterns from young adulthood to midlife and late adulthood on cognitive function in older adults was explored. Methods: A total of 5,809 individuals aged≥60 years were included and categorized into four groups on the basis of BMI change patterns. Cognitive function was assessed using four cognition tests in the baseline survey. The relationship between the weight-change patterns and cognition was evaluated using regression models. …Results: In comparison with participants who remained at non-obese, those moving from the non-obese to obese weight-change pattern from young (25 years of age) to middle adulthood showed lower Digit Symbol Substitution Test (DSST) scores (β= –1.28; 95% confidence interval [CI]: –2.24 to –0.32). A non-obese to obese change pattern from age 25 years of age to 10 years before baseline was associated with a higher risk of DSST impairment (odds ratio = 1.40; 95% CI: 1.09 to 1.79). In comparison with participants whose heaviest weight was recorded after 60 years of age, those with the heaviest weight between 18 and 40 years of age had lower DSST scores (β= –1.46; 95% CI: –2.77 to –1.52). Conclusion: Our results suggest that the transition from the non-obese to obese category in early adulthood and appearance of the heaviest weight between 18 and 40 years of age are associated with lower cognitive function in later life. Show more

Keywords: Body mass index, body weight changes, cognition, overweight

DOI: 10.3233/JAD-220788

Citation: Journal of Alzheimer's Disease, vol. 91, no. 3, pp. 1085-1095, 2023

Authors: Deng, Xiaoli | Geng, Zhao | Yu, Juan | Dai, Xiaoyan | Kuang, Xunjie | Chen, Xia | Li, Ruifeng | Liu, Ting | Li, Chongyi

Article Type: Research Article

Abstract: Background: The association between cataracts and cognitive functions has been reported in several studies. However, the dynamic trajectories of cognitive changes in patients with cataracts remain unelucidated. Objective: The aim of the study was to evaluate the dynamic trajectories of cognitive changes in patients with cataracts. Methods: This observational cohort study recruited 1,146 patients with age-related cataracts (ARC) from the Department of Ophthalmology, Daping Hospital, from September 2020 to November 2021. The cognitive functions of the patients were assessed using a Chinese version of the Telephone Interview of Cognitive Status-40 (TICS-40) test at baseline and 6 …months of follow-up. The trajectories and the associated risk factors for the longitudinal cognitive decline during the 6-month follow-up were investigated. Results: Patients with severe ARC [median (IQR): 0 month, 24 (22, 25); 6 months, 23 (21,25)] had lower TICS-40 scores than those with non-severe ARC [0 month, 31 (24, 33), p  < 0.001; 6 months, 31 (23,33), p  < 0.001] and controls [0 month, 32 (28, 35), p  < 0.001; 6 months, 32 (28, 35), p  < 0.001] at both baseline and 6 months of follow-up. Age (OR: 1.311, 95% CI: 1.229 to 1.398) and cataract grade (OR: 5.569, 95% CI: 2.337 to 13.273) were found to be the risk factors of cognitive decline as indicated by a decrease in the TICS-40 scores. Conclusion: ARC is associated with an increased risk of longitudinal cognitive decline; however, the reversibility of such declines needs to be investigated further. Show more

Keywords: Age, cataract, cataract grade, cognitive decline, risk factor

DOI: 10.3233/JAD-220963

Citation: Journal of Alzheimer's Disease, vol. 91, no. 3, pp. 1097-1105, 2023

Authors: Posis, Alexander Ivan B. | Yarish, Natalie M. | McEvoy, Linda K. | Jain, Purva | Kroenke, Candyce H. | Saquib, Nazmus | Ikramuddin, Farha | Schnatz, Peter F. | Bellettiere, John | Rapp, Stephen R. | Espeland, Mark A. | Shadyab, Aladdin H.

Article Type: Research Article

Abstract: Background: Social support may be a modifiable risk factor for cognitive impairment. However, few long-term, large prospective studies have examined associations of various forms of social support with incident mild cognitive impairment (MCI) and dementia. Objective: To examine associations of perceived social support with incident MCI and dementia among community-dwelling older women. Methods: This prospective cohort study included 6,670 women from the Women’s Health Initiative Memory Study who were cognitively unimpaired at enrollment. We used Cox proportional hazards models to assess associations between perceived social support with incident MCI, dementia, or either MCI/dementia during an average …10.7 (SD = 6.1)-year follow-up. Modelling was repeated for emotional/information support, affection support, tangible support, and positive social interaction subscales of social support. Results: Among 6,670 women (average age = 70 years [SD = 3.8]; 97.0% non-Hispanic/Latina; 89.8% White), greater perceived social support was associated with lower risk of MCI/dementia after adjustment for age, ethnicity, race, hormone therapy, education, income, diabetes, hypertension, and body mass index (Tertile [T]3 versus T1: HR = 0.85, 95% CI 0.74–0.99; p trend  = 0.08). Associations were significant for emotional/information support (T3 versus T1: HR = 0.84, 95% CI 0.72–0.97; p trend  = 0.04) and positive social interaction (T3 versus T1: HR = 0.85, 95% CI 0.73–0.99; p trend  = 0.06) subscales. Associations were attenuated and not significant after adjustment for depressive symptom severity. Objective: Perceived social support, emotional/information support, and positive social interaction were associated with incident MCI/dementia among older women. Results were not significant after adjustment for depressive symptom severity. Improving social support may reduce risk of MCI and dementia in older women. Show more

Keywords: Cognitive aging, epidemiology, psychosocial, women’s health

DOI: 10.3233/JAD-220967

Citation: Journal of Alzheimer's Disease, vol. 91, no. 3, pp. 1107-1119, 2023

Authors: Liu, Jia-Yao | Ma, Ling-Zhi | Wang, Jun | Cui, Xin-Jing | Sheng, Ze-Hu | Fu, Yan | Li, Meng | Ou, Ya-Nan | Yu, Jin-Tai | Tan, Lan | Lian, Yan

Article Type: Research Article

Abstract: Background: APOE ɛ4 genotype was correlated with exacerbation of pathology and higher risk of dementia in Parkinson’s disease (PD). Meanwhile, the differential influence of APOE ɛ4 on cognition in young and old individuals interpreted as antagonistic pleiotropy. Objective: To examine whether the effect of APOE ɛ4 on cognitive progression in de novo PD is age dependent. Methods: In this study, 613 de novo PD patients were recruited from Parkinson’s Progression Markers Initiative (PPMI). To examine the age-dependent relationship between APOE ɛ4 and cognitive changes, we added 3-way interaction of APOE …ɛ4*baseline age*time to the linear mixed-effect (LME) models and evaluated the specific roles of APOE ɛ4 in the middle age group and elderly group separately. Cox regression was utilized to examine the progression of cognition in age-stratified PD participants. Results: Age significantly modified relationship between APOE ɛ4 and cognitive changes in most cognitive domains (pinteraction <0.05). In the elderly group, APOE ɛ4 carriers showed steeper decline in global cognition (p  = 0.001) as well as in most cognitive domains, and they had a greater risk of cognitive progression (adjusted HR 1.625, 95% CI 1.143–2.310, p  = 0.007), compared with non-carriers. However, in the middle age group, no significant relationships between APOE ɛ4 and cognitive decline can be detected. Conclusion: Our results indicated that the APOE ɛ4 allele has an age-dependent effect on cognitive decline in PD patients. The underlying mechanisms need to be investigated in the future. Show more

Keywords: Age, APOE ɛ4, cognition, Parkinson’s disease

DOI: 10.3233/JAD-220976

Citation: Journal of Alzheimer's Disease, vol. 91, no. 3, pp. 1121-1132, 2023

Authors: Leng, Yue | Stone, Katie L. | Yaffe, Kristine

Article Type: Research Article

Abstract: Background: The effect of sleep medications on cognition in older adults is controversial, possibly dependent upon sleep quality, and may differ by race. Objective: To determine the longitudinal association between sleep medication use and incident dementia over 15 years, and to explore whether the association is independent of nighttime sleep disturbances and if it differs by race. Methods: We examined 3,068 community-dwelling older adults (aged 74.1±2.9 years, 41.7% Black, 51.5% female) without dementia. Sleep medication use was recorded three times by asking “Do you take sleeping pills or other medications to help you sleep?” with the …response options: “Never (0)”, “Rarely (≤1/month)”, “Sometimes (2–4/month)”, “Often (5–15/month)”, or “Almost Always (16–30/month)”. Incident dementia was defined using hospitalization records, dementia medication prescription or clinically significant decline in global cognition. Results: 138 (7.71%) of Whites and 34 (2.66%) of Blacks reported taking sleep medications “often or almost always”. Whites were almost twice as likely to take all prescription hypnotics. 617 participants developed dementia over the follow-up. After adjustment for all covariates, participants who reported taking sleep medications ≥ 5/month versus ≤1/month were significantly more likely to develop dementia, and the association was only observed among Whites (HR = 1.79,1.21–2.66) but not Blacks (HR = 0.84,0.38–1.83); p for interaction = 0.048. Further adjustment for nighttime sleep did not appreciably alter the results. The association was similar for the cumulative frequency of sleep medication use and remained after introducing a time lag of 3 years. Conclusion: Frequent sleep medication use was associated with an increased risk of dementia in White older adults. Further research is needed to determine underlying mechanisms. Show more

Keywords: Dementia, epidemiology, medication, race, sleep

DOI: 10.3233/JAD-221006

Citation: Journal of Alzheimer's Disease, vol. 91, no. 3, pp. 1133-1139, 2023

Authors: Parker, Daniel C. | Kraus, William E. | Whitson, Heather E. | Kraus, Virginia B. | Smith, Patrick J. | Cohen, Harvey Jay | Pieper, Carl F. | Faldowski, Richard A. | Hall, Katherine S. | Huebner, Janet L. | Ilkayeva, Olga R. | Bain, James R. | Newby, L. Kristin | Huffman, Kim M.

Article Type: Research Article

Abstract: Background: The kynurenine pathway (KP) comprises a family of tryptophan-derived metabolites that some studies have reported are associated with poorer cognitive performance and an increased risk of Alzheimer’s disease and related dementias (ADRD). Objective: The objective of this study was to determine the associations of plasma KP metabolites (kynurenine [KYN], kynurenic acid [KA], and tryptophan [TRP]) with a panel of plasma ADRD biomarkers (Aβ42 / β40 ratio, pTau-181, glial fibrillary acidic protein [GFAP], and neurofilament light [NfL]) and cognitive performance in a subset of older adults drawn from the Duke Physical Performance Across the LifeSpan (PALS) study. …Methods: The Montreal Cognitive Assessment (MoCA) was used to assess cognitive performance. We used multivariate multiple regression to evaluate associations of the KYN/TRP and KA/KYN ratios with MoCA score and plasma ADRD biomarkers at baseline and over two years (n  = 301; Age = 74.8±8.7). Results: Over two years, an increasing KYN/TRP ratio was associated with increasing plasma concentrations of plasma p-Tau181 (β= 6.151; 95% CI [0.29, 12.01]; p  = 0.040), GFAP (β= 11.12; 95% CI [1.73, 20.51 ]; p  = 0.020), and NfL (β= 11.13; 95% CI [2.745, 19.52 ]; p  = 0.009), but not MoCA score or the Aβ42 /Aβ40 ratio. There were no significant associations of KA/KYN with MoCA score or plasma ADRD biomarkers. Conclusion: Our findings provide evidence that greater concentrations of KP metabolites are associated longitudinally over two years with greater biomarker evidence of neurofibrillary tau pathology (pTau-181), neuroinflammation (GFAP), and neurodegeneration (NfL), suggesting that dysregulated KP metabolism may play a role in ADRD pathogenesis. Show more

Keywords: Alzheimer’s disease and related dementias, biomarkers, cognition, kynurenines, tryptophan

DOI: 10.3233/JAD-220906

Citation: Journal of Alzheimer's Disease, vol. 91, no. 3, pp. 1141-1150, 2023

Authors: Canário, Nádia S. | Jorge, Lília P. | Santana, Isabel J. | Castelo-Branco, Miguel S.

Article Type: Research Article

Abstract: Background: Investigation of neural response patterns along the entire network of functionally defined object recognition ventral stream regions in Alzheimer’s disease (AD) is surprisingly lacking. Objective: We aimed to investigate putative functional reorganization along a wide-ranging network of known regions in the ventral visual stream in mild AD. Methods: Overall we investigated 6 regions of interest (5 of which were not investigated before), in 19 AD patients and 19 controls, in both hemispheres along the ventral visual stream: Fusiform Face Area, Fusiform Body Area, Extrastriate Body Area, Lateral Occipital Cortex, Parahippocampal Place Area, and Visual Word …Form Area, while assessing object recognition performance. Results: We found group differences in dprime measures for all object categories, corroborating generalized deficits in object recognition. Concerning neural responses, we found region dependent group differences respecting a priori expected Hemispheric asymmetries. Patients showed significantly decreased BOLD responses in the right hemisphere-biased Fusiform Body Area, and lower left hemisphere responses in the Visual Word Form Area (with a priori known left hemispheric bias), consistent with deficits in body shape and word/pseudoword processing deficits. This hemispheric dominance related effects were preserved when controlling for performance differences. Whole brain analysis during the recognition task showed enhanced activity in AD group of left dorsolateral prefrontal cortex, left cingulate gyrus, and in the posterior cingulate cortex— a hotspot of amyloid-β accumulation. Conclusion: These findings demonstrate region dependent respecting hemispheric dominance patterns activation changes in independently localized selective regions in mild AD, accompanied by putative compensatory activity of frontal and cingular networks. Show more

Keywords: Alzheimer’s disease, fMRI, recognition, ventral visual stream

DOI: 10.3233/JAD-220055

Citation: Journal of Alzheimer's Disease, vol. 91, no. 3, pp. 1151-1164, 2023

Authors: Schäfer, Simona | Mallick, Elisa | Schwed, Louisa | König, Alexandra | Zhao, Jian | Linz, Nicklas | Bodin, Timothy Hadarsson | Skoog, Johan | Possemis, Nina | ter Huurne, Daphne | Zettergren, Anna | Kern, Silke | Sacuiu, Simona | Ramakers, Inez | Skoog, Ingmar | Tröger, Johannes

Article Type: Research Article

Abstract: Background: Modern prodromal Alzheimer’s disease (AD) clinical trials might extend outreach to a general population, causing high screen-out rates and thereby increasing study time and costs. Thus, screening tools that cost-effectively detect mild cognitive impairment (MCI) at scale are needed. Objective: Develop a screening algorithm that can differentiate between healthy and MCI participants in different clinically relevant populations. Methods: Two screening algorithms based on the remote ki:e speech biomarker for cognition (ki:e SB-C) were designed on a Dutch memory clinic cohort (N  = 121) and a Swedish birth cohort (N  = 404). MCI classification was each evaluated on …the training cohort as well as on the unrelated validation cohort. Results: The algorithms achieved a performance of AUC  0.73 and AUC  0.77 in the respective training cohorts and AUC  0.81 in the unseen validation cohorts. Conclusion: The results indicate that a ki:e SB-C based algorithm robustly detects MCI across different cohorts and languages, which has the potential to make current trials more efficient and improve future primary health care. Show more

Keywords: Alzheimer’s disease, biomarker, clinical trial, machine learning, mild cognitive impairment, screening

DOI: 10.3233/JAD-220762

Citation: Journal of Alzheimer's Disease, vol. 91, no. 3, pp. 1165-1171, 2023

Authors: Sakai, Kenji | Noguchi-Shinohara, Moeko | Tanaka, Hidetomo | Ikeda, Tokuhei | Hamaguchi, Tsuyoshi | Kakita, Akiyoshi | Yamada, Masahito | Ono, Kenjiro

Article Type: Research Article

Abstract: Background: Cerebrospinal fluid (CSF) biomarkers in patients with cerebral amyloid angiopathy-related inflammation (CAA-ri) have demonstrated inconsistent results. Objective: We investigated the relationship between CSF amyloid-β protein (Aβ) and vascular pathological findings to elucidate the mechanisms of Aβ elimination from the brain in CAA-ri. Methods: We examined Aβ40 and Aβ42 levels in CSF samples in 15 patients with CAA-ri and 15 patients with Alzheimer’s disease and cerebral amyloid angiopathy (AD-CAA) using ELISA as a cross-sectional study. Furthermore, we pathologically examined Aβ40 and Aβ42 depositions on the leptomeningeal blood vessels (arteries, arterioles, and veins) …using brain biopsy samples from six patients with acute CAA-ri and brain tissues of two autopsied patients with CAA-ri. Results: The median Aβ40 and Aβ42 levels in the CSF showed no significant difference between pre-treatment CAA-ri (Aβ40, 6837 pg/ml; Aβ42 , 324 pg/ml) and AD-CAA (Aβ40 , 7669 pg/ml, p  = 0.345; Aβ42 , 355 pg/ml, p  = 0.760). Aβ40 and Aβ42 levels in patients with post-treatment CAA-ri (Aβ40, 1770 pg/ml, p  = 0.056; Aβ42 , 167 pg/ml, p  = 0.006) were lower than those in patients with pre-treatment CAA-ri. Regarding Aβ40 and Aβ42 positive arteries, acute CAA-ri cases showed a higher frequency of partially Aβ-deposited blood vessels than postmortem CAA-ri cases (Aβ40 , 20.8% versus 3.9%, p  = 0.0714; Aβ42 , 27.4% versus 2.0%, p  = 0.0714, respectively). Conclusion: Lower levels of CSF Aβ40 and Aβ42 could be biomarkers for the cessation of inflammation in CAA-ri reflecting the recovery of the intramural periarterial drainage pathway and vascular function. Show more

Keywords: Amyloid-β protein-related angiitis, amyloid-related imaging abnormalities, biomarker, cerebral amyloid angiopathy-related inflammation, cerebrospinal fluid, diagnosis, elimination, pathology, vasculitis

DOI: 10.3233/JAD-220838

Citation: Journal of Alzheimer's Disease, vol. 91, no. 3, pp. 1173-1183, 2023

Authors: Downer, Brian | Li, Chih-Ying | Al Snih, Soham

Article Type: Research Article

Abstract: Background: Evidence from predominately non-Hispanic White populations indicates that emergency room (ER) admissions and hospitalizations by older adults with and without dementia are associated with caregiver stress and depressive symptoms. These results may not generalize to Hispanic populations because of cultural differences in caregiving roles, responsibilities, and perspectives about care burden. Objective: Investigate the association between ER admissions and hospitalizations by Mexican American older adults with and without dementia and symptoms of depression and stress among family caregivers. Methods: Data came from the 2010/11 wave of the Hispanic Established Populations for the Epidemiologic Study of the …Elderly and Medicare claims files. The final sample included 326 older adults and their caregivers. Negative binomial regression was used to model the association between hospitalizations and ER admissions by older adults in the previous two years and caregivers’ depressive symptoms and stress in 2010/11. Results: The number of older adult ER admissions and hospitalizations was not associated with caregiver depressive symptoms. Two or more ER admissions (incident rate ratio [IRR] = 1.26, 95% CI = 1.05–1.51) and two or more hospitalizations (IRR = 1.32, 95% CI = 1.07–1.61) were associated with significantly higher caregiver stress. Additionally, ER admissions and hospitalizations for a circulatory disease or injury and poisoning were associated with significantly higher caregiver stress. These associations were not modified by the care recipient’s dementia status. Conclusion: Hospitalizations and ER admissions by older Mexican Americans were associated with greater caregiver stress but not depressive symptoms. These associations were similar for caregivers to older adults with and without dementia. Show more

Keywords: Caregivers, dementia, health services, Mexican Americans

DOI: 10.3233/JAD-220997

Citation: Journal of Alzheimer's Disease, vol. 91, no. 3, pp. 1185-1195, 2023

Authors: Chen, Yuzhao | Zhang, Yilin | Chen, Qiuxuan | Liu, Yuxiang | Wei, Xuemin | Wu, Meijian | Zhang, Keke | Liu, Yinghua | Wei, Wei

Article Type: Research Article

Abstract: Background: The metabotropic glutamate receptor 5 (mGluR5) is widely expressed in postsynaptic neurons and plays a vital role in the synaptic plasticity of the central nervous system. mGluR5 is a coreceptor for amyloid-β (Aβ) oligomer, and downregulation or pharmacological blockade of mGluR5 presents the therapeutic potential of Alzheimer’s disease (AD). However, the abnormality of mGluR5 in the pathogenesis of AD and its mechanism of pathology is not clear. Objective: In this study, we would like to investigate the expression of mGluR5 in the process of AD and explore the effects and the underlying mechanisms of antagonizing mGluR5 on …cognitive function, synaptic structure, and inflammation in 5xFAD mice. Methods: mGluR5 expression and interactions with PrPc in 5XFAD mice were detected using western blot and co-immunoprecipitation. The selective mGluR5 antagonist MPEP was infused into 4-month-old 5XFAD mice for 60 consecutive days. Then, cognitive function, AD-like pathology and synaptic structure were measured. Further observations were made in mGluR5 knockdown 5XFAD mice. Results: mGluR5 expression was increased with Aβ levels at 6 months in 5XFAD mice. mGluR5 antagonist rescued cognitive disorders, promoted synaptic recovery, and alleviated both the Aβ plaque load and abnormal hyperphosphorylation in 6-month-old 5XFAD mice. Meanwhile, the results were validated in mGluR5 knockdown mice. Blockade of mGluR5 efficiently alleviates AD-like pathologies by inhibiting the PI3K/AKT/mTOR pathway and activates autophagy in 5XFAD mice. Furthermore, antagonism of mGluR5 attenuated neuroinflammation by inactivating the IKK/NF-κ B pathway. Conclusion: These findings suggest that mGluR5 may be an effective drug target for AD treatment, and inhibition of the mGluR5/PI3K-AKT pathway alleviates AD-like pathology by activating autophagy and anti-neuroinflammation in 5XFAD mice. Show more

Keywords: Alzheimer’s disease, autophagy, mGluR5, MPEP, neuroinflammation

DOI: 10.3233/JAD-221058

Citation: Journal of Alzheimer's Disease, vol. 91, no. 3, pp. 1197-1214, 2023

Authors: Fleming, Victoria | Helsel, Brian C. | Ptomey, Lauren T. | Rosas, H. Diana | Handen, Benjamin | Laymon, Charles | Christian, Bradley T. | Head, Elizabeth | Mapstone, Mark | Lai, Florence | Krinsky-McHale, Sharon | Zaman, Shahid | Ances, Beau M. | Lee, Joseph H. | Hartley, Sigan L.

Article Type: Research Article

Abstract: Background: Virtually all adults with Down syndrome (DS) develop Alzheimer’s disease (AD) pathology, but research gaps remain in understanding early signs of AD in DS. Objective: The goal of the present study was to determine if unintentional weight loss is part of AD in DS. The specific aims were to: 1) examine relation between chronological age, weight, AD pathology, and AD-related cognitive decline were assessed in a large cohort of adults with DS, and 2) determine if baseline PET amyloid-β (Aβ) and tau PET status (–versus+) and/or decline in memory and mental status were associated with weight loss …prior to AD progression. Methods: Analyses included 261 adults with DS. PET data were acquired using [11 C] PiB for Aβ and [18 F] AV-1451 for tau. Body mass index (BMI) was calculated from weight and height. Direct measures assessed dementia and memory. Clinical AD status was determined using a case consensus process. Percent weight decline across 16–20 months was assessed in a subset of participants (n  = 77). Results: Polynomial regressions indicated an 0.23 kg/m2 decrease in BMI per year beginning at age 36.5 years, which occurs alongside the period during which Aβ and tau increase and memory and mental status decline. At a within-person level, elevated Aβ, decline in memory and mental status were associated with higher percent weight loss across 16–20 months. Conclusion: Unintentional weight loss occurs alongside Aβ deposition and prior to onset of AD dementia, and thus may be a useful sign of AD in DS. Show more

Keywords: Alzheimer’s disease, amyloid, biomarkers, body mass index, tau, weight

DOI: 10.3233/JAD-220865

Citation: Journal of Alzheimer's Disease, vol. 91, no. 3, pp. 1215-1227, 2023

Article Type: Correction

DOI: 10.3233/JAD-229019

Citation: Journal of Alzheimer's Disease, vol. 91, no. 3, pp. 1229-1229, 2023