Journal of Alzheimer's Disease - Volume 80, issue 4

Authors: Jouini, Najla | Saied, Zakaria | Ben Sassi, Samia | Nebli, Fatma | Messaoud, Taieb | Hentati, Faycel | Belal, Samir

Article Type: Research Article

Abstract: Background: Iron plays an important role in maintaining cell survival, with normal iron trafficking known to be regulated by the ceruloplasmin-transferrin (Cp-Tf) antioxidant system. Disruption to this system is thought to be detrimental to normal brain function. Objective: To determine whether an imbalance of iron and the proteins involved in its metabolism (ceruloplasmin and transferrin) are linked to Alzheimer’s disease (AD) and to the expression of amyloid-beta (Aβ) peptide 1–42 (Aβ1–42 ), which is a major species of Aβ, and the most toxic. Methods: We evaluated the concentrations of iron, calcium, magnesium, and Aβ1–42 in …the cerebrospinal fluid (CSF) of patients with AD and cognitively normal controls. Correlations between the components of the Cp-Tf antioxidant system in plasma were studied to determine the role of peripheral blood in the onset and/or development of AD. We used commercial ELISA immunoassays to measure Aβ1–42 , immunoturbidimetry to quantify ceruloplasmin and transferrin, and colorimetry to quantify iron, calcium, and magnesium. Results: We found that the AD group had lower CSF concentrations of Aβ1–42 (p  < 0.001) and calcium (p  < 0.001), but a higher CSF concentration of iron (p  < 0.001). Significantly lower plasma concentrations of ceruloplasmin (p  = 0.003), transferrin (mean, p  < 0.001), and iron (p  < 0.001) were observed in the AD group than in cognitively normal adults. Moreover, we found a strong interdependence between most of these components. Conclusion: Iron dyshomeostasis has a crucial role in the onset of AD and/or its development. Correcting metal misdistribution is an appealing therapeutic strategy for AD. Show more

Keywords: Alzheimer’s disease, blood stream, calcium, cerebrospinal fluid, ceruloplasmin, iron metabolism, transferrin

DOI: 10.3233/JAD-201250

Citation: Journal of Alzheimer's Disease, vol. 80, no. 4, pp. 1439-1450, 2021

Authors: Clark, Alexandra L. | Weigand, Alexandra J. | Thomas, Kelsey R. | Solders, Seraphina K. | Delano-Wood, Lisa | Bondi, Mark W. | Bernier, Rachel A. | Sundermann, Erin E. | Banks, Sarah J. | Bangen, Katherine J. | for the Alzheimer’s Disease Neuroimaging Initiative

Article Type: Research Article

Abstract: Background: Age-related cerebrovascular and neuroinflammatory processes have been independently identified as key mechanisms of Alzheimer’s disease (AD), although their interactive effects have yet to be fully examined. Objective: The current study examined 1) the influence of pulse pressure (PP) and inflammatory markers on AD protein levels and 2) links between protein biomarkers and cognitive function in older adults with and without mild cognitive impairment (MCI). Methods: This study included 218 ADNI (81 cognitively normal [CN], 137 MCI) participants who underwent lumbar punctures, apolipoprotein E (APOE ) genotyping, and cognitive testing. Cerebrospinal (CSF) levels of eight pro-inflammatory …markers were used to create an inflammation composite, and amyloid-beta 1–42 (Aβ42 ), phosphorylated tau (p-tau), and total tau (t-tau) were quantified. Results: Multiple regression analyses controlling for age, education, and APOE ɛ4 genotype revealed significant PP x inflammation interactions for t-tau (B = 0.88, p  = 0.01) and p-tau (B = 0.84, p  = 0.02); higher inflammation was associated with higher levels of tau within the MCI group. However, within the CN group, analyses revealed a significant PP x inflammation interaction for Aβ42 (B = –1.01, p  = 0.02); greater inflammation was associated with higher levels of Aβ42 (indicative of lower cerebral amyloid burden) in those with lower PP. Finally, higher levels of tau were associated with poorer memory performance within the MCI group only (p s  < 0.05). Conclusion: PP and inflammation exert differential effects on AD CSF proteins and provide evidence that vascular risk is associated with greater AD pathology across our sample of CN and MCI older adults. Show more

Keywords: Cerebrospinal fluid, inflammation, mild cognitive impairment, tau, vascular dysfunction

DOI: 10.3233/JAD-201382

Citation: Journal of Alzheimer's Disease, vol. 80, no. 4, pp. 1451-1463, 2021

Authors: Beauchet, Olivier | Sekhon, Harmehr | Launay, Cyrille P. | Gaudreau, Pierrette | Morais, José A. | Allali, Gilles

Article Type: Research Article

Abstract: Background: Motoric cognitive risk syndrome (MCR) and mild cognitive impairment (MCI) are two pre-dementia stages with an overlap, which may influence the risk for dementia. Objective: The study aims to examine the association of MCR, MCI, and their combination with incident dementia in Quebec community-dwelling older adults. Methods: 1,063 older adults (i.e., ≥65) were selected from a population-based observational cohort study known as the “Nutrition as a determinant of successful aging: The Quebec longitudinal study ” (NuAge). Participants were separated into four groups at the baseline assessment: those without MCR and MCI (i.e., cognitively healthy individual; …CHI), those with MCR alone, those with MCI alone, and those with MCR plus MCI. Incident dementia was recorded at each annual visit during a 3-year follow-up. Results: The prevalence of CHI was 87.2%, MCR 3.0%, MCI 8.8%, and MCR plus MCI 0.9%. The overall incidence of dementia was 2.4% and was significantly associated with MCR alone (Odd Ratio (OR) = 5.00 with 95% Confidence interval (CI) = [1.01;24.59] and p  = 0.049), MCI alone (OR = 6.04 with 95% CI = [2.36;15.47] and p ≤0.001), and the combination of MCR and MCI (OR = 25.75 with 95% CI = [5.32;124.66] and p ≤0.001). Conclusion: Combining MCR and MCI increased the risk for incident dementia. These results also demonstrated that this combination is a better predictor of dementia than MCI or MCR alone. Show more

Keywords: Cohort study, dementia, epidemiology, incidence, older adults

DOI: 10.3233/JAD-201571

Citation: Journal of Alzheimer's Disease, vol. 80, no. 4, pp. 1465-1470, 2021

Authors: Zingel, Rebecca | Bohlken, Jens | Kostev, Karel

Article Type: Research Article

Abstract: Background: The critical role of inflammatory processes in the pathogenesis of dementia has recently been established. Objective: The aim of this study was to investigate the association between inflammatory bowel disease (IBD) and dementia risk in patients followed in general practices in Germany. Methods: This study included patients aged over 60 with an initial diagnosis of IBD (Crohn’s Disease (CD), ulcerative colitis (UC)) who were followed in 1,159 German general practices between January 1995 and December 2014. IBD patients were matched to healthy patients using propensity scores based on age, gender, index year, insurance type and …comorbidities. Kaplan-Meier curves were used to study the development of dementia in patients with or without IBD within up to 15 years of the index date. Cox proportional hazard regression models were used to estimate the relationship between IBD and dementia. Results: The study included 3,850 patients with and 3,850 patients without IBD and revealed a higher cumulative incidence of dementia in IBD patients than in non-IBD patients after the follow-up period. The cumulative incidence of dementia differed within IBD subtypes; it was significantly higher in UC patients than in CD patients. Cox proportional hazard models showed that IBD is associated with a 1.22-fold increase in the risk (95% CI: 1,07–1,39) of developing dementia. UC patients had a 1.25-fold higher risk of developing dementia (95% CI: 1.07–1.46). CD is not significantly associated with an increased risk of dementia (HR: 1.17, 95% CI: 0.93–1.47). Conclusion: A positive association between IBD and dementia was found in patients followed in general practices in Germany. Show more

Keywords: Crohn’s disease, dementia, inflammatory bowel disease, ulcerative colitis

DOI: 10.3233/JAD-210103

Citation: Journal of Alzheimer's Disease, vol. 80, no. 4, pp. 1471-1478, 2021

Authors: Moussavi Nik, Seyyed Hani | Porter, Tenielle | Newman, Morgan | Bartlett, Benjamin | Khan, Imran | Sabale, Miheer | Eccles, Melissa | Woodfield, Amy | Groth, David | Dore, Vincent | Villemagne, Victor L. | Masters, Colin L. | Martins, Ralph N. | Laws, Simon M. | Lardelli, Michael | Verdile, Giuseppe

Article Type: Research Article

Abstract: Background: The PRESENILIN genes (PSEN1 , PSEN2 ) encoding for their respective proteins have critical roles in many aspects of Alzheimer’s disease (AD) pathogenesis. The PS2V transcript of PSEN2 encodes a truncated protein and is upregulated in AD brains; however, its relevance to AD and disease progression remains to be determined. Objective: Assess transcript levels in postmortem AD and non-AD brain tissue and in lymphocytes collected under the Australian Imaging Biomarker and Lifestyle (AIBL) study. Methods: Full length PSEN2 and PS2V transcript levels were assessed by quantitative digital PCR in postmortem …brain tissue (frontal cortex and hippocampus) from control, AD, frontotemporal dementia (FTD), and Lewy body dementia (LBD). Transcript levels were also assessed in lymphocytes obtained from the Perth subset of the AIBL study (n  = 160). Linear regression analysis was used to assess correlations between transcript copy number and brain volume and neocortical amyloid load. Results: PS2V levels increased in AD postmortem brain but PS2V was also present at significant levels in FTD and LBD brains. PS2V transcript was detected in lymphocytes and PS2V /PSEN2 ratios were increased in mild cognitive impairment (p  = 0.024) and AD (p  = 0.019) groups compared to control group. Increased ratios were significantly correlated with hippocampal volumes only (n  = 62, β= –0.269, p  = 0.03). Conclusion: Taken together, these results suggest that PS2V may be a marker of overall neurodegeneration. Show more

Keywords: Alzheimer’s disease, frontotemporal dementia, Lewy body dementia, lymphocytes, neurodegeneration, Presenilin 2

DOI: 10.3233/JAD-201133

Citation: Journal of Alzheimer's Disease, vol. 80, no. 4, pp. 1479-1489, 2021

Authors: Zamarian, Laura | Karner, Elfriede | Bodner, Thomas | Djamshidian, Atbin | Delazer, Margarete

Article Type: Research Article

Abstract: Background: Education has a protective effect toward cognitive decline in advanced age and is an important factor contributing to cognitive reserve. Objective: To elucidate the interaction effect of education and global mental status on cognitive performance of older patients with progressive cognitive decline. Methods: This retrospective study included 1,392 patients. We performed moderation regressions to examine the interaction between education and global mental status (Mini-Mental State Examination (MMSE) score) on performance in episodic memory, executive functions (EF), language, and constructional praxis tests. Significant interaction effects were further explored through separate linear regressions by MMSE level (inferior: …≤24; intermediate: 25–27; superior: 28–30). Results: There was an interaction between MMSE and education for some but not all variables. At intermediate and superior MMSE levels, high-educated people had a clear advantage relative to low-educated people in verbal memory and EF tests. This advantage was not significant at an inferior MMSE level. In object naming, constructional praxis recall, and constructional praxis, high-educated people performed better than low-educated people, independently of MMSE level. Conclusion: Education has a differential effect on cognitive performance in patients with cognitive decline. While high education is not helpful for episodic memory and EF at low cognitive levels, it is still beneficial for retrieving words or other semantic knowledge. These findings suggest an interaction between global mental status and education on different cognitive domains and have strong clinical implications. Diagnostic judgments should be based on the knowledge of such interaction. This study highlights the beneficial but selective effects of high education. Show more

Keywords: Aging, cognition, cognitive dysfunction, cognitive reserve, diagnosis, education, neuropsychology

DOI: 10.3233/JAD-201608

Citation: Journal of Alzheimer's Disease, vol. 80, no. 4, pp. 1491-1501, 2021

Authors: Chen, Yongjie | Du, Yue | Sun, Zhuoyu | Liu, Qian | Sun, Changqing | Lin, Hongyan | Jin, Mengdi | Fu, Jingzhu | Ma, Fei | Li, Wen | Liu, Huan | Zhang, Xumei | Wang, Guangshun | Huang, Guowei

Article Type: Research Article

Abstract: Background: Handgrip strength (HGS) and serum folate and homocysteine (Hcy) levels were associated with cognitive function. However, little was known whether there were interactions between HGS and serum folate and Hcy levels on cognitive function. Objective: To examine the interactions between HGS and serum folate and Hcy levels on cognitive function. Methods: This study analyzed the baseline data of the Tianjin Elderly Nutrition and Cognition Cohort study. All participants aged ≥60 years were potential eligible. HGS was measured using a grip strength dynamometer. Serum folate and Hcy levels were assayed using standard laboratory protocol. A Mini-Mental …State Examination was used to assess cognitive function. Linear regressions were employed to examine the interactions between HGS and serum folate and Hcy levels on cognitive function. Results: 4,484 participants were included in this study. There were interactions between HGS and serum folate and Hcy levels on cognitive function. Furthermore, subjects with strong HGS and sufficient folate level had the best cognitive function (β= 2.018), sequentially followed by those with strong HGS and insufficient folate level (β= 1.698) and with poor HGS and sufficient folate level (β= 0.873). Similarly, cognitive function was ranked in the descending order of subjects with strong HGS and normal Hcy level (β= 1.971), strong HGS and high Hcy level (β= 1.467), and poor HGS and normal Hcy level (β= 0.657). Conclusion: There were interactions between HGS and serum folate and Hcy levels on cognitive function. However, the temporal associations cannot be examined in a cross-sectional study. Further cohort study should be conducted to confirm these associations in the future. Show more

Keywords: Alzheimer’s disease, cognitive function, handgrip strength, serum folate, serum homocysteine

DOI: 10.3233/JAD-201537

Citation: Journal of Alzheimer's Disease, vol. 80, no. 4, pp. 1503-1513, 2021

Authors: Gervais, Frederic | Dauphinot, Virginie | Mouchoux, Christelle | Krolak-Salmon, Pierre

Article Type: Research Article

Abstract: Background: Literature supports an increasing number of older patients living with neurocognitive disorders alongside with their annual worldwide costs. Therapeutic management of behavioral and psychological symptoms includes the use of anticholinergic and sedative drugs for which significant exposure is negatively associated with clinical outcomes. Objective: The aim of this study was to assess the healthcare costs differences related to an increase in the exposure to anticholinergic and sedative drugs in older patients with neurocognitive disorder. Methods: A longitudinal study was conducted during 3 years on 1,604 participants of the MEMORA cohort linked with both regional public …health insurance and hospital discharge databases between 2012 and 2017. Direct medical and non-medical costs were included. Exposure to anticholinergic and sedative drugs was measured by the drug burden index (DBI). Results: Costs difference associated with a DBI≥0.5 were + 338€ (p  < 0.001). After adjustment on comorbidities, NCD stage, cognitive impairment, functional limitation, polypharmacy, and sociodemographic characteristics, a DBI≥0.5 was found to be an independent predictor of an increase of total healthcare costs by 22%(p  < 0.001). Conclusion: Anticholinergic and sedative drugs have a substantial economic burden among older patients with neurocognitive disorder. More studies are required to assess the clinical and economic impact of an efficient strategy based on the reduction of the exposure to anticholinergic and sedative drugs and the promotion of non-pharmacological interventions. Show more

Keywords: Adverse effects, aging, cholinergic antagonists, cost of illness, drug effects, hypnotics and sedatives, longitudinal studies

DOI: 10.3233/JAD-201127

Citation: Journal of Alzheimer's Disease, vol. 80, no. 4, pp. 1515-1524, 2021

Authors: Ten Brinke, Lisanne F. | Hsu, Chun Liang | Erickson, Kirk I. | Handy, Todd C. | Liu-Ambrose, Teresa

Article Type: Research Article

Abstract: Background: Evidence suggests that computerized cognitive training (CCT) can improve cognitive function in older adults, particularly executive functions. However, the underlying mechanisms by which CCT may improve executive functions are not well established. Objective: To determine: 1) inter-network functional connectivity correlates of changes in executive functions; and 2) the effect of CCT on these functional connectivity correlates. Methods: This secondary analysis included a subset of 124 adults aged 65–85 years enrolled in an 8-week randomized controlled trial of CCT. Participants were randomized to either: 1) group-based CCT 3x/week for 1 hour plus 3x/week home-based training; 2) …group-based CCT preceded by brisk walking (Ex+CCT) 3x/week for 1 hour plus 3x/week home-based training; or 3) group-based balanced and toned (BAT) classes 3x/week for 1 hour (control). At baseline and trial completion, 65 of the 124 participants completed resting-state functional magnetic resonance imaging and neuropsychological tests of executive functions, specifically the Stroop Colour-Word Test and Flanker Test. Results: Improved performance on the Stroop Colour-Word Test and Flanker Test were associated with decreased correlation between the default mode network (DMN) and the fronto-parietal network (FPN) (p  < 0.05). Compared with BAT, CCT alone significantly decreased correlation between the left dorsolateral prefrontal cortex and both the left and right medial temporal gyrus (–0.143, 95%CI [–0.256,–0.030], p  = 0.014, and –0.123, 95%CI [–0.242,–0.004], p  = 0.043, respectively). Conclusion: Decreased correlation between DMN and FPN, indicating less connection between these networks, may be an underlying mechanism by which CCT improves executive functions. Future studies are needed to replicate this finding. Show more

Keywords: Clinical trial, cognitive aging, executive function, magnetic resonance imaging

DOI: 10.3233/JAD-200844

Citation: Journal of Alzheimer's Disease, vol. 80, no. 4, pp. 1525-1537, 2021

Authors: Tanner, Jared J. | Hanchate, Shivani | Price, Catherine C. | Garvan, Cynthia | Lai, Song | Staud, Roland | Deshpande, Hrishikesh | Deutsch, Georg | Goodin, Burel R. | Fillingim, Roger B. | Sibille, Kimberly T.

Article Type: Research Article

Abstract: Background: Non-Hispanic black (NHB) individuals have increased risk of Alzheimer’s disease (AD) relative to non-Hispanic whites (NHW). Ethnicity/race can serve as a proxy sociodemographic variable for a complex representation of sociocultural and environmental factors. Chronic pain is a form of stress with high prevalence and sociodemographic disparities. Chronic pain is linked to lower cognition and accelerated biological aging. Objective: The purpose of this study is to seek understanding of potential cognitive and temporal lobe structural brain AD vulnerabilities based on chronic pain stage and ethnicity/race. Methods: Participants included 147 community dwelling NHB and NHW adults without …dementia between 45–85 years old who had or were at risk of knee osteoarthritis. All participants received an MRI (3T Philips), the Montreal Cognitive Assessment (MoCA), and assessment of clinical knee pain stage. Results: There were ethnic/race group differences in MoCA scores but no relationships with chronic knee pain stage. Ethnicity/race moderated the relationship between AD-related temporal lobe thickness and chronic pain stage with quadratic patterns suggesting thinner cortex in high chronic pain stage NHB adults. Conclusion: There appear to be complex relationships between chronic knee pain stage, temporal lobe cortex, and sociodemographic variables. Specifically, NHB participants without dementia but with high chronic knee pain stage appeared to have thinner temporal cortex in areas associated with AD. Understanding the effects of sociocultural and socioeconomic factors on health outcomes is the first step to challenging the disparities in healthcare that now appear to link disease conditions to neurodegenerative processes. Show more

Keywords: Alzheimer’s disease, chronic pain, ethnic groups, magnetic resonance imaging, race factors, risk factors, socioeconomic factors, temporal lobe

DOI: 10.3233/JAD-201345

Citation: Journal of Alzheimer's Disease, vol. 80, no. 4, pp. 1539-1551, 2021

Authors: Drake, Jonathan D. | Chambers, Alison B. | Ott, Brian R. | Daiello, Lori A. | for the Alzheimer’s Disease Neuroimaging Initiative

Article Type: Research Article

Abstract: Background: Cerebrovascular dysfunction confers risk for functional decline in Alzheimer’s disease (AD), yet the clinical interplay of these two pathogenic processes is not well understood. Objective: We utilized Alzheimer’s Disease Neuroimaging Initiative (ADNI) data to examine associations between peripherally derived soluble cell adhesion molecules (CAMs) and clinical diagnostic indicators of AD. Methods: Using generalized linear regression models, we examined cross-sectional relationships of soluble plasma vascular cell adhesion molecule-1 (VCAM-1), intercellular adhesion molecule-1 (ICAM-1), and E-Selectin to baseline diagnosis and functional impairment (clinical dementia rating sum-of-boxes, CDR-SB) in the ADNI cohort (n  = 112 AD, n  = 396 mild …cognitive impairment (MCI), n  = 58 cognitively normal). We further analyzed associations of these biomarkers with brain-based AD biomarkers in a subset with available cerebrospinal fluid (CSF) data (n  = 351). p-values derived from main effects and interaction terms from the linear regressions were used to assess the relationship between independent and dependent variables for significance (significance level was set at 0.05 a priori for all analysis). Results: Higher mean VCAM-1 (p  = 0.0026) and ICAM-1 (p  = 0.0189) levels were found in AD versus MCI groups; however, not in MCI versus cognitively normal groups. Only VCAM-1 was linked with CDR-SB scores (p  = 0.0157), and APOE ɛ4 genotype modified this effect. We observed independent, additive associations when VCAM-1 and CSF amyloid-β (Aβ42 ), total tau, phosphorylated tau (P-tau), or P-tau/Aβ42 (all < p = 0.01) were combined in a CDR-SB model; ICAM-1 showed a similar pattern, but to a lesser extent. Conclusion: Our findings indicate independent associations of plasma-based vascular biomarkers and CSF biomarkers with AD-related clinical impairment. Show more

Keywords: Alzheimer’s disease, E-Selectin, intercellular adhesion molecule-1, vascular cell adhesion molecule-1

DOI: 10.3233/JAD-200759

Citation: Journal of Alzheimer's Disease, vol. 80, no. 4, pp. 1553-1565, 2021

Authors: Beishon, Lucy C. | Panerai, Ronney B. | Budgeon, Charley | Subramaniam, Hari | Mukaetova-Ladinska, Elizabeta | Robinson, Thompson G. | Haunton, Victoria J.

Article Type: Research Article

Abstract: Background: Cognitive training (CT) has demonstrated benefits for healthy older adults (HG) and mild cognitive impairment (MCI), but the effects on vascular function are unknown. Objective: This is a feasibility trial investigating the effects of CT on cerebral blood flow velocity (CBFv). Methods: Twenty HG, 24 with Alzheimer’s disease (AD), and 12 with MCI were randomized to 12 weeks of multi-domain CT or control. Outcomes included: cognition (Addenbrooke’s Cognitive Examination III), mood, quality of life (QoL), physical, and neurovascular function (transcranial Doppler ultrasonography measured task activation of CBFv responses). Data are presented as mean difference (MD) …and 95% confidence interval (CI). Results: 47 participants completed the trial. There were three dropouts from the training arm in the AD group, and one in the HG group. The intervention was acceptable and feasible to the majority of participants with a high completion rate (89%). The dropout rate was higher among participants with dementia. Few changes were identified on secondary analyses, but QoL was significantly improved in HG post-training (MD: 4.83 [95% CI: 1.13, 8.54]). CBFv response rate was not significantly different in HG (MD: 1.84 [95% CI: –4.81, 1.12]), but a significant increase was seen in the patient group (MD: 1.79 [95% CI: 0.005, 3.58]), requiring sample sizes of 56 and 84 participants respectively for a fully-powered trial. Conclusion: A 12-week CT program was acceptable and feasible in HG, AD, and MCI. CT may be associated with alterations in vascular physiology which require further investigation in an appropriately powered randomized controlled trial. Show more

Keywords: Cerebral blood flow, cerebral hemodynamics, cognition, cognitive impairment, dementia

DOI: 10.3233/JAD-201444

Citation: Journal of Alzheimer's Disease, vol. 80, no. 4, pp. 1567-1581, 2021

Authors: El Said, Salma M.S. | Adly, Nermien N. | Abdul-Rahman, Samia A.

Article Type: Research Article

Abstract: Background: The ongoing scientific debate regarding the association between physical function and cognitive impairment has focused mainly on global cognitive performance rather than specific cognitive functions tests and the importance of recognition of its associations and any factors that could play a role later in the prevention of such decline. Objective: This study examined the association between physical function, using handgrip strength (HGS) and Timed Up-and-Go test (TUGT), and executive function (EF), using Clock Drawing Test (CDT), among community-dwelling Egyptian elderly. Methods: A cross-sectional study was conducted in 5 social clubs in Cairo, Egypt and included …a sample of 136 elderly males and females aged≥55 years old. All participants had their physical function assessed using TUGT, and measurement of HGS using a pneumatic hand-held dynamometer. Assessment of EF using CDT was also done. Results: Higher CDT scores were significantly associated with both better HGS, and lower TUGT (OR = 3.77, and 0.65 respectively). This persisted even after adjustment for age and gender (OR = 2.56, and 0.71 respectively) and after further adjustment for weight, systolic blood pressure, education, smoking, hyperlipidemia, hypothyroidism, and physical activity (O.R. = 4.79, and 0.76 respectively). Adjustment for both male and female genders showed an association between physical (HGS and TUGT) and EF was stronger among men. Conclusion: A strong association between CDT score and both of HGS and TUGT was found among the studied sample. Higher HGS and lower TUGT was significantly associated with better performance in the CDT. This association is stronger in males than in females for both HGS and TUGT. Show more

Keywords: Clock Drawing Test, elderly, executive function, handgrip strength, Timed Up-and-Go test

DOI: 10.3233/JAD-201423

Citation: Journal of Alzheimer's Disease, vol. 80, no. 4, pp. 1583-1589, 2021

Authors: Zhou, Rui | Liu, Hua-Min | Li, Fu-Rong | Yang, Hai-Lian | Zheng, Jia-Zhen | Zou, Meng-Chen | Zou, Lian-Wu | Wu, Xiao-Xiang | Wu, Xian-Bo

Article Type: Research Article

Abstract: Background: Wealth and income are potential modifiable risk factors for dementia, but whether wealth status, which is composed of a combination of debt and poverty, and assessed by wealth and income, is associated with cognitive impairment among elderly adults remains unknown. Objective: To examine the associations of different combinations of debt and poverty with the incidence of dementia and cognitive impairment without dementia (CIND) and to evaluate the mediating role of depression in these relationships. Methods: We included 15,565 participants aged 51 years or older from the Health and Retirement Study (1992–2012) who were free of …CIND and dementia at baseline. Dementia and CIND were assessed using either the modified Telephone Interview for Cognitive Status (mTICS) or a proxy assessment. Cox models with time-dependent covariates and mediation analysis were used. Results: During a median of 14.4 years of follow-up, 4,484 participants experienced CIND and 1,774 were diagnosed with dementia. Both debt and poverty were independently associated with increased dementia and CIND risks, and the risks were augmented when both debt and poverty were present together (the hazard ratios [95% confidence intervals] were 1.35 [1.08–1.70] and 1.96 [1.48–2.60] for CIND and dementia, respectively). The associations between different wealth statuses and cognition were partially (mediation ratio range: 11.8–29.7%) mediated by depression. Conclusion: Debt and poverty were associated with an increased risk of dementia and CIND, and these associations were partially mediated by depression. Alleviating poverty and debt may be effective for improving mental health and therefore curbing the risk of cognitive impairment and dementia. Show more

Keywords: Cognitive impairment, cohort studies, dementia, depression, mediation analysis, wealth status

DOI: 10.3233/JAD-201239

Citation: Journal of Alzheimer's Disease, vol. 80, no. 4, pp. 1591-1601, 2021

Authors: Gupta, Harsh V. | Beach, Thomas G. | Mehta, Shyamal H. | Shill, Holly A. | Driver-Dunckley, Erika | Sabbagh, Marwan N. | Belden, Christine M. | Liebsack, Carolyn | Dugger, Brittany N. | Serrano, Geidy E. | Sue, Lucia I. | Siderowf, Andrew | Pontecorvo, Michael J. | Mintun, Mark A. | Joshi, Abhinay D. | Adler, Charles H.

Article Type: Research Article

Abstract: Background: Imaging biomarkers have the potential to distinguish between different brain pathologies based on the type of ligand used with PET. AV-45 PET (florbetapir, Amyvid™) is selective for the neuritic plaque amyloid of Alzheimer’s disease (AD), while AV-133 PET (florbenazine) is selective for VMAT2, which is a dopaminergic marker. Objective: To report the clinical, AV-133 PET, AV-45 PET, and neuropathological findings of three clinically diagnosed dementia patients who were part of the Avid Radiopharmaceuticals AV133-B03 study as well as the Arizona Study of Aging and Neurodegenerative Disorders (AZSAND). Methods: Three subjects who had PET imaging with …both AV-133 and AV-45 as well as a standardized neuropathological assessment were included. The final clinical, PET scan, and neuropathological diagnoses were compared. Results: The clinical and neuropathological diagnoses were made blinded to PET scan results. The first subject had a clinical diagnosis of dementia with Lewy bodies (DLB); AV-133 PET showed bilateral striatal dopaminergic degeneration, and AV-45 PET was positive for amyloid. The final clinicopathological diagnosis was DLB and AD. The second subject was diagnosed clinically with probable AD; AV-45 PET was positive for amyloid, while striatal AV-133 PET was normal. The final clinicopathological diagnosis was DLB and AD. The third subject had a clinical diagnosis of DLB. Her AV-45 PET was positive for amyloid and striatal AV-133 showed dopaminergic degeneration. The final clinicopathological diagnosis was multiple system atrophy and AD. Conclusion: PET imaging using AV-133 for the assessment of striatal VMAT2 density may help distinguish between AD and DLB. However, some cases of DLB with less-pronounced nigrostriatal dopaminergic neuronal loss may be missed. Show more

Keywords: Alzheimer’s disease, amyloid, AV-133, dementia with Lewy bodies, synucleinopathy, VMAT2

DOI: 10.3233/JAD-200323

Citation: Journal of Alzheimer's Disease, vol. 80, no. 4, pp. 1603-1612, 2021

Authors: Poptsi, Eleni | Tsolaki, Magda | Bergh, Sverre | Cesana, Bruno Mario | Ciccone, Alfonso | Fabbo, Andrea | Frisoni, Giovanni B. | Frölich, Lutz | Lavolpe, Sara | Guazzarini, Anna Giulia | Hugon, Jacques | Fascendini, Sara | Defanti, Carlo Alberto

Article Type: Research Article

Abstract: Background: Behavioral and psychological symptoms of dementia (BPSD) are quite challenging problems during the dementia course. Special Care Units for people with dementia (PwD) and BPSD (SCU-B) are residential medical structures, where BPSD patients are temporarily admitted, in case of unmanageable behavioral disturbances at home. Objective: RECage (REspectful Caring for AGitated Elderly) aspires to assess the short and long-term effectiveness of SCU-Bs toward alleviating BPSD and improving the quality of life (QoL) of PwD and their caregivers. Methods: RECage is a three-year, prospective study enrolling 500 PwD. Particularly, 250 community-dwelling PwDs presenting with severe BPSD will …be recruited by five clinical centers across Europe, endowed with a SCU-B, for a short period of time; a second similar group of 250 PwD will be followed by six other no-SCU-B centers solely via outpatient visits. RECage’s endpoints include short and long-term SCU-B clinical efficacy, QoL of patients and caregivers, cost-effectiveness of the SCU-B, psychotropic drug consumption, caregivers’ attitude toward dementia, and time to nursing home placement. Results: PwD admitted in SCU-Bs are expected to have diminished rates of BPSD and better QoL and their caregivers are also expected to have better QoL and improved attitude towards dementia, compared to those followed in no-SCU-Bs. Also, the cost of care and the psychotropic drug consumption are expected to be lower. Finally, PwD followed in no-SCU-Bs are expected to have earlier admission to nursing homes. Conclusion: The cohort study results will refine the SCU-B model, issuing recommendations for implementation of SCU-Bs in the countries where they are scarce or non-existent. Show more

Keywords: Behavioral disturbances, dementia, special care units

DOI: 10.3233/JAD-201215

Citation: Journal of Alzheimer's Disease, vol. 80, no. 4, pp. 1613-1627, 2021

Authors: Lukkarinen, Heikki | Tesseur, Ina | Pemberton, Darrel | Van Der Ark, Peter | Timmers, Maarten | Slemmon, Randy | Janssens, Luc | Streffer, Johannes | Van Nueten, Luc | Bottelbergs, Astrid | Rauramaa, Tuomas | Koivisto, Anne M. | Herukka, Sanna-Kaisa | Korhonen, Ville E. | Junkkari, Antti | Hiltunen, Mikko | Engelborghs, Sebastiaan | Blennow, Kaj | Zetterberg, Henrik | Kolb, Hartmuth C. | Leinonen, Ville

Article Type: Research Article

Abstract: Background: Longitudinal changes in cerebrospinal fluid (CSF) biomarkers are seldom studied. Furthermore, data on biomarker gradient between lumbar (L-) and ventricular (V-) compartments seems to be discordant. Objective: To examine alteration of CSF biomarkers reflecting Alzheimer’s disease (AD)-related amyloid-β (Aβ) aggregation, tau pathology, neurodegeneration, and early synaptic degeneration by CSF shunt surgery in idiopathic normal pressure hydrocephalus (iNPH) in relation to AD-related changes in brain biopsy. In addition, biomarker levels in L- and V-CSF were compared. Methods: L-CSF was collected prior to shunt placement and, together with V-CSF, 3–73 months after surgery. Thereafter, additional CSF sampling …took place at 3, 6, and 18 months after the baseline sample from 26 iNPH patients with confirmed Aβ plaques in frontal cortical brain biopsy and 13 iNPH patients without Aβ pathology. CSF Amyloid-β42 (Aβ42 ), total tau (T-tau), phosphorylated tau (P-tau181 ), neurofilament light (NFL), and neurogranin (NRGN) were analyzed with customized ELISAs. Results: All biomarkers but Aβ42 increased notably by 140–810% in L-CSF after CSF diversion and then stabilized. Aβ42 instead showed divergent longitudinal decrease between Aβ-positive and -negative patients in L-CSF, and thereafter increase in Aβ-negative iNPH patients in both L- and V-CSF. All five biomarkers correlated highly between V-CSF and L-CSF (Aβ42 R = 0.87, T-tau R = 0.83, P-tau R = 0.92, NFL R = 0.94, NRGN R = 0.9; all p  < 0.0001) but were systematically lower in V-CSF (Aβ42 14 %, T-tau 22%, P-tau 20%, NFL 32%, NRGN 19%). With APOE genotype-grouping, only Aβ42 showed higher concentration in non-carriers of allele ɛ 4. Conclusion: Longitudinal follow up shows that after an initial post-surgery increase, T-tau, P-tau, and NRGN are stable in iNPH patients regardless of brain biopsy Aβ pathology, while NFL normalized toward its pre-shunt levels. Aβ42 as biomarker seems to be the least affected by the surgical procedure or shunt and may be the best predictor of AD risk in iNPH patients. All biomarker concentrations were lower in V- than L-CSF yet showing strong correlations. Show more

Keywords: Aβ42 , biomarkers, idiopathic normal pressure hydrocephalus, neurofilament light, neurogranin, P-tau, T-tau

DOI: 10.3233/JAD-201361

Citation: Journal of Alzheimer's Disease, vol. 80, no. 4, pp. 1629-1642, 2021

Authors: van Zutphen, Elisabeth Maria | Rijnhart, Judith Johanna Maria | Rhebergen, Didericke | Muller, Majon | Huisman, Martijn | Beekman, Aartjan | Kok, Almar | Appelman, Yolande

Article Type: Research Article

Abstract: Background: Sex differences in cognitive functioning in old age are known to exist yet are still poorly understood. Objective: This study examines to what extent differences in cardiovascular risk factors and cardiovascular disease between men and women explain sex differences in cognitive functioning. Methods: Data from 2,724 older adults from the Longitudinal Aging Study Amsterdam were used. Information processing speed and episodic memory, measured three times during six years of follow-up, served as outcomes. The mediating role of cardiovascular risk factors and cardiovascular disease was examined in single and multiple mediator models. Determinant-mediator effects were estimated …using linear or logistic regression, and determinant-outcome and mediator-outcome effects were estimated using linear mixed models. Indirect effects were estimated using the product-of-coefficients estimator. Results: Women scored 1.58 points higher on information processing speed and 1.53 points higher on episodic memory. Several cardiovascular risk factors had small mediating effects. The sex difference in information processing speed was mediated by smoking, depressive symptoms, obesity, and systolic blood pressure. The sex difference in episodic memory was mediated by smoking, physical activity, and depressive symptoms. Effects of smoking, LDL cholesterol, and diabetes mellitus on information processing speed differed between men and women. Conclusion: Differences in cardiovascular risk factors between women and men partially explained why women had better cognitive functioning. A healthy cardiovascular lifestyle seems beneficial for cognition and sex-specific strategies may be important to preserve cognitive functioning at older age. Show more

Keywords: Aged, behavior, cardiovascular diseases, cognition, epidemiology, episodic memory, sex

DOI: 10.3233/JAD-201173

Citation: Journal of Alzheimer's Disease, vol. 80, no. 4, pp. 1643-1655, 2021

Authors: Valotassiou, Varvara | Sifakis, Nikolaos | Tzavara, Chara | Lykou, Evi | Tsinia, Niki | Kamtsadeli, Vasiliki | Sali, Dimitra | Angelidis, George | Psimadas, Dimitrios | Tsougos, Ioannis | Papageorgiou, Sokratis G. | Georgoulias, Panagiotis | Papatriantafyllou, John

Article Type: Research Article

Abstract: Background: Eating disorders (ED) in dementia represent a significant impairment affecting patients’ and caregivers’ lives. In frontotemporal dementia (FTD), ED include overeating, sweet food preference, stereotypical eating, and hyperorality, while in Alzheimer’s disease (AD), anorexia and appetite loss are the most common ED. Objective: The aim of our study was to highlight Brodmann areas (BAs) implicated specifically in the appearance of ED in FTD and AD. Methods: We studied 141 patients, 75 with FTD and 66 with AD. We used the NeuroGamTM software on the reconstructed single photon emission computed tomography-SPECT data for the automated …comparison of BAs perfusion on the left (L) and right (R) hemisphere with perfusion in corresponding BAs of a normal database. Results: The FTD group included 27 men and 48 women, age (mean±SD) 65.8±8.5 years, duration of disease 3.4±3.3 years, Mini-Mental State Examination (MMSE) 17.9±8.6, ED score on Neuropsychiatric Inventory (NPI) 4.7±8.5. ED in FTD were correlated with hypoperfusion in right anterior and dorsolateral prefrontal cortices (BAs 10R, 46R), left orbitofrontal cortex (BA 12L), orbital part of the right inferior frontal gyrus (BA 47R), and left parahippocampal gyrus (BA 36L). The AD group included 21 men and 45 women, age (mean±SD) 70.2±8.0 years, duration of disease 3.3±2.4 years, MMSE 20.2±6, ED-NPI score 2.7±3.9. ED in AD were correlated with hypoperfusion in left inferior temporal cortex (BA 20L). Conclusion: SPECT imaging with automated mapping of brain cortex could contribute to the understanding of the neural networks involved in the manifestation of ED in dementia. Show more

Keywords: Alzheimer’s disease, Brodmann areas, eating disorders, frontotemporal dementia, perfusion, SPECT

DOI: 10.3233/JAD-201434

Citation: Journal of Alzheimer's Disease, vol. 80, no. 4, pp. 1657-1667, 2021

Authors: Luca, Antonina | Nicoletti, Alessandra | Donzuso, Giulia | Terravecchia, Claudio | Cicero, Calogero Edoardo | D’Agate, Concetta | Rascuná, Cristina | Manna, Roberta | Mostile, Giovanni | Zappia, Mario

Article Type: Research Article

Abstract: Background: The neuropsychological profile of progressive supranuclear palsy (PSP) patients is mainly characterized by executive dysfunction, but the relationship between the latter and midbrain atrophy is still unclear. Objective: The aims of the study were to investigate which test evaluating executive functioning is more frequently impaired in PSP patients and to evaluate the relationship between midbrain-based MRI morphometric measures and executive dysfunction. Methods: PSP patients who had undergone a neuropsychological battery assessing executive functioning with the Frontal Assessment Battery (FAB), the phonemic verbal fluency F-A-S, the Raven’s Progressive Colored Matrix, and the Stroop word colors test …(time and errors) were enrolled in the study. A group of Parkinson’s disease (PD) patients matched by age, sex, education, and global cognitive status was selected. All the enrolled patients also underwent a volumetric T1-3D brain MRI. Results: Thirty-five PSP patients and 35 PD patients were enrolled. Patients with PSP as compared to patients with PD showed a significant greater impairment in verbal fluency (16.0±7.9 and 23.4±8.7 words/180 s; p  < 0.001) and a significant lower score at the FAB total score (11.5±3.8 and 13.7±3.4; p  = 0.013). Midbrain area was significantly smaller in PSP patients than in PD patients (83.9±20.1 and 134.5±19.9 mm2 ; p  < 0.001). In PSP patients, a significant positive correlation between verbal fluency and the midbrain area (r  = 0.421; p  = 0.028) was observed. Conclusion: Our findings suggest that the phonemic verbal fluency is among the most frequently impaired executive functions in PSP patients and is strongly correlated to midbrain atrophy. Show more

Keywords: Executive functions, midbrain atrophy, progressive supranuclear palsy, verbal fluency

DOI: 10.3233/JAD-210023

Citation: Journal of Alzheimer's Disease, vol. 80, no. 4, pp. 1669-1674, 2021

Authors: Pagen, Linda H.G. | Smeets, Tom | Schmiedek, Lisa | Yassa, Michael A. | Verhey, Frans R.J. | Jacobs, Heidi I.L.

Article Type: Research Article

Abstract: Background: Reductions in memory practice effects have gained interest as risk factor for future cognitive decline. Practice effects vary with age and can be moderated by factors such as individual variability in arousal or stress experience acting as an additional cognitive load. Objective: In the current pilot study, we examined whether sympathetic nervous system activation moderates the relationship between age and practice effects. Methods: Thirty cognitively healthy individuals aged 40–70 years performed a mnemonic discrimination task twice. Salivary alpha amylase (sAA) samples were obtained at different time points as a proxy of sympathetic activity. Spearman correlations …examined the relation between practice effects and sAA. Subsequently, age by sAA interactions on practice scores were explored with bootstrapped linear regression models. Additionally, participants were divided in learners (exhibiting practice effects) and non-learners based on the difference in mnemonic discrimination performance. Results: Higher age and baseline SNS activity were independently related to lower practice effects. The non-learners showed significantly higher sAA scores at all time points compared to learners. Among the learners, baseline-adjusted lower levels of sAA after encoding were associated with greater practice effects, particularly in middle-aged individuals. No such interaction was observed for non-learners. Conclusion: These results show that higher baseline sympathetic activation is associated with worse practice effects independently of age. Additionally, in a subgroup of middle-aged learners practice effects were observed when sympathetic activity remained low during learning. These findings suggest that elevated sympathetic nervous system activation may be a promising indicator of imminent cognitive decline. Show more

Keywords: Aging, memory, pattern separation, practice effects, sympathetic nervous system

DOI: 10.3233/JAD-200783

Citation: Journal of Alzheimer's Disease, vol. 80, no. 4, pp. 1675-1685, 2021

Authors: Taslima, Ferdous | Jung, Cha-Gyun | Zhou, Chunyu | Abdelhamid, Mona | Abdullah, Mohammad | Goto, Tetsuya | Saito, Takashi | Saido, Takaomi C. | Michikawa, Makoto

Article Type: Research Article

Abstract: Background: Epidemiological studies have shown that tooth loss is associated with Alzheimer’s disease (AD) and dementia. However, the molecular and cellular mechanisms by which tooth loss causes AD remain unclear. Objective: We investigated the effects of tooth loss on memory impairment and AD pathogenesis in AppNL -G -F mice. Methods: Maxillary molar teeth on both sides were extracted from 2-month-old AppNL -G -F mice, and the mice were reared for 2 months. The short- and long-term memory functions were evaluated using a novel object recognition test and a passive avoidance …test. Amyloid plaques, amyloid-β (Aβ) levels, glial activity, and neuronal activity were evaluated by immunohistochemistry, Aβ ELISA, immunofluorescence staining, and western blotting. The mRNA expression levels of neuroinflammatory cytokines were determined by qRT-PCR analysis. Results: Tooth loss induced memory impairment via an amyloid-cascade-independent pathway, and decreased the neuronal activity, presynaptic and postsynaptic protein levels in both the cortex and hippocampus. Interestingly, we found that tooth loss induced glial activation, which in turn leads to the upregulation of the mRNA expression levels of the neuroinflammation cytokines tumor necrosis factor-α (TNF-α), interleukin-6 (IL-6), and IL-1β in the hippocampus. We also found that tooth loss activated a stress-activated protein kinase, c-Jun N-terminal kinase (JNK), and increased heat shock protein 90 (HSP90) levels in the hippocampus, which may lead to a glial activation. Conclusion: Our findings suggest that taking care of teeth is very important to preserve a healthy oral environment, which may reduce the risk of cognitive dysfunction. Show more

Keywords: Alzheimer’s disease, AppNL-G-Fknock-in mice, chronic stress, glial activation, memory impairment, synapses, tooth loss

DOI: 10.3233/JAD-201055

Citation: Journal of Alzheimer's Disease, vol. 80, no. 4, pp. 1687-1704, 2021

Authors: Borelli, Wyllians Vendramini | Augustin, Marina Coutinho | de Oliveira, Paola Bell Felix | Reggiani, Lorenzo Casagrande | Bandeira-de-Mello, Renato Gorga | Schumacher-Schuh, Artur Francisco | Chaves, Marcia Lorena Fagundes | Castilhos, Raphael Machado

Article Type: Research Article

Abstract: Background: The social isolation imposed by COVID-19 pandemic can have a major impact on the mental health of dementia patients and their caregivers. Objective: We aim to evaluate the neurological decline of patients with dementia and the caregivers’ burden during the pandemic. Methods: We performed a cross-sectional study. Caregivers of dementia patients following in the outpatient clinic were included. A structured telephone interview composed of the Neuropsychiatric Inventory Questionnaire (NPI-Q), Zarit Burden Interview (ZBI), Beck Depression (BDI) and Anxiety (BAI) Inventories to address cognitive, behavioral, and functional changes associated with social distancing during the Sars-Cov-2 outbreak. …Patients were divided in two groups according to caregivers’ report: with perceived Altered Cognition (AC) and Stable Cognition (SC). Results: A total of 58 patients (median age: 57 years [21–87], 58.6%females) and caregivers (median age: 76.5 years [55–89], 79.3%females) were included. Cognitive decline was shown by most patients (53.4%), as well as behavioral symptoms (48.3%), especially apathy/depression (24.1%), and functional decline (34.5%). The AC group (n  = 31) presented increased behavioral (67.7%versus 25.9%, p  = 0.002) and functional (61.3%versus 3.7%, p  < 0.001) changes when compared to the SC group. In the AC group, ZBI, BDI, NPI-Q caregiver distress, and NPI-Q patient’s severity of symptoms scores were worse than the SC group (p  < 0.005 for all). Conclusion: Patients’ neuropsychiatric worsening and caregiver burden were frequent during the pandemic. Worsening of cognition was associated with increased caregivers’ psychological distress. Show more

Keywords: Alzheimer’s disease, COVID-19, dementia, mental health, Sars-Cov-2, social isolation

DOI: 10.3233/JAD-201513

Citation: Journal of Alzheimer's Disease, vol. 80, no. 4, pp. 1705-1712, 2021

Authors: Pongan, Elodie | Dorey, Jean-Michel | Borg, Céline | Getenet, Jean Claude | Bachelet, Romain | Lourioux, Charles | Laurent, Bernard | COVCARE Group | Rey, Romain | Rouch, Isabelle

Article Type: Research Article

Abstract: Background: From March 2020, the support and care systems for caregivers and people with dementia (PWD) were suspended or dramatically changed due to the lockdown during the world pandemic of COVID-19. Thus, these changes in living conditions have had deleterious consequences on the behavior of PWD and subsequently on their caregivers’ mental health, the two being linked. Objective: Our study aimed to examine changes in behavior among PWD and to look for associations between the evolution of behavioral and psychological symptoms of dementia (BPSD) and caregivers’ mental health in the context of COVID-19. Methods: The study …was conducted among caregivers of PWD living at home in France. Caregivers were interviewed via an anonymous cross-sectional online survey during the first lockdown between April 15 and June 15, 2020. Results: Three hundred and eighty-nine caregivers accompanying a relative living at home participated in the study; 43.3%of the PWD presented a worsening of BPSD during the lockdown. With multivariate logistic regressions, a significant association was observed between ”more BPSD” and burden, anxiety and depression, between “BPSD equivalent” and anxiety and depression, and between “emerging BPSD” and only depression. Conclusion: The lockdown seems to have an impact on behavioral disorders in PWD and these disorders are associated with poorer mental health of caregivers. Our findings suggest attention should be given to caregivers of PWD who have BPSD before lockdown and the need for continued consultations and professional help in case of new lockdowns. Show more

Keywords: Behavioral disorder, caregivers, COVID-19, lockdown, mental health

DOI: 10.3233/JAD-201396

Citation: Journal of Alzheimer's Disease, vol. 80, no. 4, pp. 1713-1721, 2021

Authors: Ni, Ruiqing | Röjdner, Jennie | Voytenko, Larysa | Dyrks, Thomas | Thiele, Andrea | Marutle, Amelia | Nordberg, Agneta

Article Type: Research Article

Abstract: Background: Emerging evidence indicates a central role of gliosis in Alzheimer’s disease (AD) pathophysiology. However, the regional distribution and interaction of astrogliosis and microgliosis in association with amyloid-β (Aβ) still remain uncertain. Objective: Here we studied the pathological profiles in autopsy AD brain by using specific imaging tracers. Methods: Autopsy brain tissues of AD (n  = 15, age 70.4±8.5 years) and control cases (n  = 12, age 76.6±10.9) were examined with homogenate binding assays, autoradiography for Aβ plaques (3 H-florbetaben/3 H-PIB), astrogliosis (3 H-L-deprenyl), and microgliosis (3 H-PK11195/3 H-FEMPA), as well as immunoassays. Results: In vitro …saturation analysis revealed high-affinity binding sites of 3 H-florbetaben, 3 H-L-deprenyl, and 3 H-PK11195/3 H-FEMPA in the frontal cortex of AD cases. In vitro 3 H-florbetaben binding increased across cortical and subcortical regions of AD compared to control with the highest binding in the frontal and parietal cortices. The in vitro 3 H-L-deprenyl binding showed highest binding in the hippocampus (dentate gyrus) followed by cortical and subcortical regions of AD while the GFAP expression was upregulated only in the hippocampus compared to control. The in vitro 3 H-PK11195 binding was solely increased in the parietal cortex and the hippocampus of AD compared to control. The 3 H-florbetaben binding positively correlated with the 3 H-L-deprenyl binding in the hippocampus and parietal cortex of AD and controls. Similarly, a positive correlation was observed between 3 H-florbetaben binding and GFAP expression in hippocampus of AD and control. Conclusion: The use of multi-imaging tracers revealed different regional pattern of changes in autopsy AD brain with respect to amyloid plaque pathology versus astrogliosis and microgliosis. Show more

Keywords: Alzheimer’s disease, amyloid-beta peptides, astrocytes, glial fibrillary acid protein, microglia, monoamine oxidase B, positron emission tomography

DOI: 10.3233/JAD-201344

Citation: Journal of Alzheimer's Disease, vol. 80, no. 4, pp. 1723-1737, 2021

Article Type: Correction

DOI: 10.3233/JAD-219318

Citation: Journal of Alzheimer's Disease, vol. 80, no. 4, pp. 1739-1739, 2021