Journal of Alzheimer's Disease - Volume 96, issue 3

Authors: McEvoy, Linda K. | Bergstrom, Jaclyn | Hagler Jr , Donald J. | Wing, David | Reas, Emilie T.

Article Type: Research Article

Abstract: Background: Hearing loss is associated with cognitive decline and increased risk for Alzheimer’s disease, but the basis of this association is not understood. Objective: To determine whether hearing impairment is associated with advanced brain aging or altered microstructure in areas involved with auditory and cognitive processing. Methods: 130 participants, (mean 76.4±7.3 years; 65% women) of the Rancho Bernardo Study of Healthy Aging had a screening audiogram in 2003–2005 and brain magnetic resonance imaging in 2014–2016. Hearing ability was defined as the average pure tone threshold (PTA) at 500, 1000, 2000, and 4000 Hz in the better-hearing ear. …Brain-predicted age difference (Brain-pad) was calculated as the difference between brain-predicted age based on a validated structural imaging biomarker of brain age, and chronological age. Regional diffusion metrics in temporal and frontal cortex regions were obtained from diffusion-weighted MRIs. Linear regression analyses adjusted for age, gender, education, and health-related measures. Results: PTAs were not associated with brain-PAD (β= 0.09; 95% CI: –0.084 to 0.243; p  = 0.34). PTAs were associated with reduced restricted diffusion and increased free water diffusion primarily in right hemisphere temporal and frontal areas (restricted diffusion: βs = –0.21 to –0.30; 95% CIs from –0.48 to –0.02; ps < 0.03; free water: βs = 0.18 to 0.26; 95% CIs 0.01 to 0.438; ps < 0.04). Conclusions: Hearing impairment is not associated with advanced brain aging but is associated with differences in brain regions involved with auditory processing and attentional control. It is thus possible that increased dementia risk associated with hearing impairment arises, in part, from compensatory brain changes that may decrease resilience. Show more

Keywords: Alzheimer’s disease, dementia, hearing impairment, MRI, neuroimaging

DOI: 10.3233/JAD-230767

Citation: Journal of Alzheimer's Disease, vol. 96, no. 3, pp. 1163-1172, 2023

Authors: Bernardes, Catarina | Lima, Marisa | Duro, Diana | Silva-Spínola, Anuschka | Durães, João | Tábuas-Pereira, Miguel | Baldeiras, Inês | Freitas, Sandra | Santana, Isabel

Article Type: Research Article

Abstract: Background: Mild cognitive impairment (MCI) is considered a prodromal state of dementia. Abnormal values of cerebrospinal fluid Alzheimer’s disease biomarkers (CSF-AD-b) have been associated with a higher risk of conversion to dementia (due to Alzheimer’s disease), but studies evaluating the ability of Montreal Cognitive Assessment (MoCA) in this task are lacking. Objective: This study aims to investigate the relationship between MoCA and CSF-AD-b, as well as the ability of those tools to predict conversion to dementia. Methods: Taking advantage of our MCI cohort with biological characterization on longitudinal follow-up (180 patients followed for 62.6 months during …which 41.3% converted), we computed MoCA and MMSE z-scores, using Portuguese normative data. The performance in MoCA z-score was correlated with CSF-AD-b and the relative time to conversion and risk according to baseline characteristics were analyzed using Kaplan-Meier analysis and Cox regression models. Results: MoCA z-scores were correlated with Aβ42 (p  = 0.026), t-tau (p  = 0.033), and p-tau (p  = 0.01). Impaired MMSE (p  < 0.001) and MoCA z-scores (p  = 0.019), decreased Aβ42 (p  < 0.001) and increased t-tau (p  < 0.001) and p-tau (p  < 0.001) were associated with shorter estimated time of conversion. Aβ42 (p  < 0.001) and MMSE z-scores (p  = 0.029) were independent predictors of conversion. For those with at least 9 years of education, MoCA z-score (p  = 0.004) (but not MMSE) was an independent predictor of conversion as well as Aβ42 . Conclusions: This study confirms the role of CSF-AD-b, namely Aβ42 , in predicting conversion from MCI to dementia and suggests the utility of MoCA in predicting conversion in highly educated subjects, supporting its use in the evaluation of MCI patients. Show more

Keywords: Alzheimer’s disease, cerebrospinal fluid Alzheimer’s disease biomarkers, conversion, dementia, mild cognitive impairment, Montreal cognitive assessment

DOI: 10.3233/JAD-230916

Citation: Journal of Alzheimer's Disease, vol. 96, no. 3, pp. 1173-1182, 2023

Authors: Zhu, Yingying | Olchanski, Natalia | Cohen, Joshua T. | Freund, Karen M. | Faul, Jessica D. | Fillit, Howard M. | Neumann, Peter J. | Lin, Pei-Jung

Article Type: Research Article

Abstract: Background: Older adults with dementia including Alzheimer’s disease may have difficulty communicating their treatment preferences and thus may receive intensive end-of-life (EOL) care that confers limited benefits. Objective: This study compared the use of life-sustaining interventions during the last 90 days of life among Medicare beneficiaries with and without dementia. Methods: This cohort study utilized population-based national survey data from the 2000-2016 Health and Retirement Study linked with Medicare and Medicaid claims. Our sample included Medicare fee-for-service beneficiaries aged 65 years or older deceased between 2000 and 2016. The main outcome was receipt of any life-sustaining …interventions during the last 90 days of life, including mechanical ventilation, tracheostomy, tube feeding, and cardiopulmonary resuscitation. We used logistic regression, stratified by nursing home use, to examine dementia status (no dementia, non-advanced dementia, advanced dementia) and patient characteristics associated with receiving those interventions. Results: Community dwellers with dementia were more likely than those without dementia to receive life-sustaining treatments in their last 90 days of life (advanced dementia: OR = 1.83 [1.42–2.35]; non-advanced dementia: OR = 1.16 [1.01–1.32]). Advance care planning was associated with lower odds of receiving life-sustaining treatments in the community (OR = 0.84 [0.74–0.96]) and in nursing homes (OR = 0.68 [0.53–0.86]). More beneficiaries with advanced dementia received interventions discordant with their EOL treatment preferences. Conclusions: Community dwellers with advanced dementia were more likely to receive life-sustaining treatments at the end of life and such treatments may be discordant with their EOL wishes. Enhancing advance care planning and patient-physician communication may improve EOL care quality for persons with dementia. Show more

Keywords: Advance care planning, Alzheimer’s disease, end of life, life-sustaining treatments

DOI: 10.3233/JAD-230692

Citation: Journal of Alzheimer's Disease, vol. 96, no. 3, pp. 1183-1193, 2023

Authors: Fernando, Malika G. | Silva, Renuka | Fernando, W.M.A.D. Binosha | de Silva, H. Asita | Wickremasinghe, A. Rajitha | Dissanayake, Asoka S. | Sohrabi, Hamid R. | Martins, Ralph N. | Williams, Shehan S.

Article Type: Research Article

Abstract: Background: Virgin coconut oil (VCO) is a potential therapeutic approach to improve cognition in Alzheimer’s disease (AD) due to its properties as a ketogenic agent and antioxidative characteristics. Objective: This study aimed to investigate the effect of VCO on cognition in people with AD and to determine the impact of apolipoprotein E (APOE ) ɛ4 genotype on cognitive outcomes. Methods: Participants of this double-blind placebo-controlled trial (SLCTR/2015/018, 15.09.2015) were 120 Sri Lankan individuals with mild-to-moderate AD (MMSE = 15-25), aged > 65 years, and they were randomly allocated to treatment or control groups. The treatment group was given 30 mL/day of …VCO orally and the control group, received similar amount of canola oil, for 24 weeks. The Mini-Mental Sate Examination (MMSE) and Clock drawing test were performed to assess cognition at baseline and at the end of the intervention. Blood samples were collected and analyzed for lipid profile and glycated hemoglobin (HbA1 C) levels.∥ Results: There were no significant difference in cognitive scores, lipid profile, and HbA1 C levels between VCO and control groups post-intervention. The MMSE scores, however, improved among APOE ɛ4 carriers who had VCO, compared to non-carriers (2.37, p  = 0.021). APOE ɛ4 status did not influence the cognitive scores in the control group. The attrition rate was 30%.∥ Conclusion: Overall, VCO did not improve cognition in individuals with mild-to-moderate AD following a 24-week intervention, compared to canola oil. However, it improved the MMSE scores in APOE ɛ4 carriers. Besides, VCO did not compromise lipid profile and HbA1 C levels and is thus safe to consume. Show more

Keywords: Alzheimer’s disease, APOE ɛ4, cognition, HbA1 C, lipid profile, virgin coconut oil

DOI: 10.3233/JAD-230670

Citation: Journal of Alzheimer's Disease, vol. 96, no. 3, pp. 1195-1206, 2023

Authors: Koulousakis, Philippos | Willems, Emily | Schepers, Melissa | Rombaut, Ben | Prickaerts, Jos | Vanmierlo, Tim | van den Hove, Daniel

Article Type: Research Article

Abstract: Background: Current treatment options for Alzheimer’s disease (AD) are limited, inefficient, and often have serious side effects. Oxytocin is a neuropeptide implicated in a variety of central processes, such as social and reproductive behaviors. Among others, it has garnered attention in various domains of psychiatric research, while its role in the development and course of neurodegenerative disorders like AD is rather unknown. Objective: This study aimed to investigate the role of exogenous oxytocin administration on memory, specifically in view of AD, as a potential novel treatment option. Methods: We describe a novel treatment approach by using …a relatively low dose of long-term intranasal oxytocin treatment, to restore memory deficits in female APPswePS1dE9 mice. Results: Female APPswePS1dE9 mice treated with oxytocin showed increased spatial memory performance in the object location task and improved working memory in the Y-Maze, while indicating decreased sociability. Conclusions: These results indicate that oxytocin is able to reverse acquired cognitive deficits in female APPswePS1dE9 mice. Show more

Keywords: Alzheimer’s disease, APPswePS1dE9, object location task, oxytocin

DOI: 10.3233/JAD-230657

Citation: Journal of Alzheimer's Disease, vol. 96, no. 3, pp. 1207-1219, 2023

Authors: Adachi, Utako | Toi, Sono | Hosoya, Megumi | Hoshino, Takao | Seki, Misa | Yoshizawa, Hiroshi | Tsutsumi, Yukiko | Maruyama, Kenji | Kitagawa, Kazuo

Article Type: Research Article

Abstract: Background: It remains unclear whether changes in the venous circulation contribute to cognitive decline. Objective: This study aimed to clarify whether the spontaneous jugular vein reflux (JVR) is associated with cognitive impairment and incident dementia. Methods: Patients with any evidence of cerebral vessel disease on magnetic resonance imaging (MRI) were consecutively enrolled between October 2015 to July 2019. We employed carotid duplex sonography to measure the internal jugular vein (IJV). The subjects were classified into two groups based on the degree of JVR on either side: none, mild (JVR(–) group) and moderate, severe (JVR (+) group) …JVR. They underwent both the Mini-Mental State Examination (MMSE) and Montreal Cognitive Assessment-Japanese (MoCA-J) global tests. Their cognitive status was prospectively assessed until March 2023. Results: 302 patients with an MMSE score ≥24 underwent duplex sonography of the IJV. Among them, 91 had spontaneous JVR on either side. Both MMSE and MoCA-J were significantly lower in patients with JVR (+) group than in the JVR (–) group. After the adjustment for risk factors and MRI findings, intergroup differences in MoCA-J remained significant. Among the cognitive subdomains, median executive function and memory scores were significantly lower in the JVR (+) group than in the JVR (–) group. During the median 5.2-year follow-up, 11 patients with incident dementia were diagnosed. Patients with severe JVR were significantly more likely to be diagnosed with dementia (log-rank test, p  = 0.031). Conclusions: Spontaneous IJV reflux especially severe JVR, was associated with global cognitive function, and potentially with incident dementia. Show more

Keywords: Alzheimer disease, cognitive decline, dementia, executive function, jugular vein reflux, memory

DOI: 10.3233/JAD-230771

Citation: Journal of Alzheimer's Disease, vol. 96, no. 3, pp. 1221-1230, 2023

Authors: Delgado-Álvarez, Alfonso | Delgado-Alonso, Cristina | Valles-Salgado, María | Gil-Moreno, María José | Fernández-Romero, Lucía | Matías-Guiu, Jorge | Matias-Guiu, Jordi A.

Article Type: Research Article

Abstract: Background: Cross-Cultural Dementia Screening (CCD), Rowland Universal Dementia Assessment Scale (RUDAS), and European Cross-cultural Neuropsychological Test Battery (CNTB) are three novel neuropsychological instruments developed from a cross-cultural perspective to reduce the impact of culture in cognitive assessment and improve the assessment in diverse populations. Objective: We aimed to collect and present normative data on these tests in a majority population sample (Spaniards living in Spain) and in a minority population sample (Colombians living in Spain). Methods: CCD, RUDAS, and CNTB were administered to a group of 300 cognitively healthy participants (150 Spaniards and 150 Colombians). Linear …regression modeling strategy was used to provide adjusted norms for demographic factors and to explore the influence of these factors on test performance. Results: Most of the CCD and CNTB scores were predicted by age and years of education, with some tests only predicted by age or showing a ceiling effect. The comparison of normative data between the two samples confirmed the favorable cross-cultural properties of these instruments, with only some differences in processing speed and executive functioning scores. Conclusions: Our study finds a comparable influence of demographic factors in both populations on the performance of CCD, RUDAS, and CNTB, confirming their adequate cross-cultural properties. We provide normative data for these tests in Spaniards and Colombians living in Spain. Show more

Keywords: Alzheimer’s disease, cognitive assessment, cross-cultural tests, multicultural, neuropsychology, normative data

DOI: 10.3233/JAD-230866

Citation: Journal of Alzheimer's Disease, vol. 96, no. 3, pp. 1231-1241, 2023

Authors: Tanner, Jared J. | Amin, Manish | Dion, Catherine | Parvataneni, Hari K. | Mareci, Thomas | Price, Catherine C.

Article Type: Research Article

Abstract: Background: Recent research shows that older adults electing to undergo total knee arthroplasty with general anesthesia have a pre- to postoperative acute increase in molecular free-water within their cerebral white matter. It is unknown if this change is similar for individuals who elect spinal anesthesia methods. Objective: To explore white matter microstructural changes in a pilot sample of older adults undergoing total knee arthroplasty and receiving general or spinal anesthesia. Methods: We assessed acute perioperative changes in brain white matter free-water in a limited number of older adults electing total knee arthroplasty under spinal anesthesia (n … = 5) and matched groups of older adults who received general anesthesia (n  = 5) or had no surgery (n  = 5). Patterns of free-water changes were also compared in the larger group of older adults electing total knee arthroplasty under general anesthesia (n  = 61) and older adults with chronic knee pain who received no surgical intervention (n  = 65). Results: Our pilot results suggest older adults receiving general anesthesia had pre- to post-surgery free-water increases extensively throughout their white matter whereas those receiving spinal anesthesia appeared to have less consistent free-water increases. Conclusions: Our pilot results possibly suggest different patterns of perioperative brain white matter free-water changes based on anesthetic approach. We recommend future, larger studies to further examine the effects of anesthetic approach on perioperative brain free-water. The results of our study have potential implications for acute and chronic cognitive changes, perioperative complications, neurodegenerative processes including Alzheimer’s disease, and understanding neuroinflammation. Show more

Keywords: Alzheimer’s disease, anesthesia, brain, cognition, diffusion magnetic resonance imaging, neuroinflammation, total knee arthroplasty

DOI: 10.3233/JAD-221246

Citation: Journal of Alzheimer's Disease, vol. 96, no. 3, pp. 1243-1252, 2023

Authors: Matsumoto, Hideki | Tagai, Kenji | Endo, Hironobu | Matsuoka, Kiwamu | Takado, Yuhei | Kokubo, Naomi | Shimada, Hitoshi | Goto, Tetsuya | Goto, Tazuko K. | Higuchi, Makoto

Article Type: Research Article

Abstract: Background: Deterioration of the oral environment is one of the risk factors for dementia. A previous study of an Alzheimer’s disease (AD) model mouse suggests that tooth loss induces denervation of the mesencephalic trigeminal nucleus and neuroinflammation, possibly leading to accelerated tau dissemination from the nearby locus coeruleus (LC). Objective: To elucidate the relevance of oral conditions and amyloid-β (Aβ) and tau pathologies in human participants. Methods: We examined the number of remaining teeth and the biofilm–gingival interface index in 24 AD-spectrum patients and 19 age-matched healthy controls (HCs). They also underwent positron emission tomography (PET) …imaging of Aβ and tau with specific radiotracers, 11 C-PiB and 18 F-PM-PBB3, respectively. All AD-spectrum patients were Aβ-positive, and all HCs were Aβ-negative. We analyzed the correlation between the oral parameters and radiotracer retention. Results: No differences were found in oral conditions between the AD and HC groups. 11 C-PiB retentions did not correlate with the oral indices in either group. In AD-spectrum patients, brain-wide, voxel-based image analysis highlighted several regions, including the LC and associated brainstem substructures, as areas where 18 F-PM-PBB3 retentions negatively correlated with the remaining teeth and revealed the correlation of tau deposits in the LC (r  = –0.479, p  = 0.018) primarily with the hippocampal and neighboring areas. The tau deposition in none of the brain regions was associated with the periodontal status. Conclusions: Our findings with previous preclinical evidence imply that tooth loss may enhance AD tau pathogenesis, promoting tau spreading from LC to the hippocampal formation. Show more

Keywords: Alzheimer’s disease, amyloid-β , oral condition, periodontal disease, positron emission tomography, tau proteins, tooth loss

DOI: 10.3233/JAD-230581

Citation: Journal of Alzheimer's Disease, vol. 96, no. 3, pp. 1253-1265, 2023

Authors: Li, Karl | Rashid, Tanweer | Li, Jinqi | Honnorat, Nicolas | Nirmala, Anoop Benet | Fadaee, Elyas | Wang, Di | Charisis, Sokratis | Liu, Hangfan | Franklin, Crystal | Maybrier, Mallory | Katragadda, Haritha | Abazid, Leen | Ganapathy, Vinutha | Valaparla, Vijaya Lakshmi | Badugu, Pradeepthi | Vasquez, Eliana | Solano, Leigh | Clarke, Geoffrey | Maestre, Gladys | Richardson, Tim | Walker, Jamie | Fox, Peter T. | Bieniek, Kevin | Seshadri, Sudha | Habes, Mohamad

Article Type: Research Article

Abstract: Background: Neuroimaging bears the promise of providing new biomarkers that could refine the diagnosis of dementia. Still, obtaining the pathology data required to validate the relationship between neuroimaging markers and neurological changes is challenging. Existing data repositories are focused on a single pathology, are too small, or do not precisely match neuroimaging and pathology findings. Objective: The new data repository introduced in this work, the South Texas Alzheimer’s Disease research center repository, was designed to address these limitations. Our repository covers a broad diversity of dementias, spans a wide age range, and was specifically designed to draw exact …correspondences between neuroimaging and pathology data. Methods: Using four different MRI sequences, we are reaching a sample size that allows for validating multimodal neuroimaging biomarkers and studying comorbid conditions. Our imaging protocol was designed to capture markers of cerebrovascular disease and related lesions. Quantification of these lesions is currently underway with MRI-guided histopathological examination. Results: A total of 139 postmortem brains (70 females) with mean age of 77.9 years were collected, with 71 brains fully analyzed. Of these, only 3% showed evidence of AD-only pathology and 76% had high prevalence of multiple pathologies contributing to clinical diagnosis. Conclusion: This repository has a significant (and increasing) sample size consisting of a wide range of neurodegenerative disorders and employs advanced imaging protocols and MRI-guided histopathological analysis to help disentangle the effects of comorbid disorders to refine diagnosis, prognosis and better understand neurodegenerative disorders. Show more

Keywords: Alzheimer’s disease, dementia, histopathology, magnetic resonance imaging, neuroimaging, postmortem diagnosis

DOI: 10.3233/JAD-230389

Citation: Journal of Alzheimer's Disease, vol. 96, no. 3, pp. 1267-1283, 2023

Authors: Wu, Wenzhe | Shen, Audrey | Lee, Inhan | Miranda-Morales, Ernesto G. | Spratt, Heidi | Pappolla, Miguel A. | Fang, Xiang | Bao, Xiaoyong

Article Type: Research Article

Abstract: Background: Alzheimer’s disease (AD) is the most common type of dementia, affecting individuals over 65. AD is also a multifactorial disease, with disease mechanisms incompletely characterized, and disease-modifying therapies are marginally effective. Biomarker signatures may shed light on the diagnosis, disease mechanisms, and the development of therapeutic targets. tRNA-derived RNA fragments (tRFs), a family of recently discovered small non-coding RNAs, have been found to be significantly enhanced in human AD hippocampus tissues. However, whether tRFs change in body fluids is unknown. Objective: To investigate whether tRFs in body fluids are impacted by AD. Methods: We first …used T4 polynucleotide kinase-RNA-seq, a modified next-generation sequencing technique, to identify detectable tRFs in human cerebrospinal fluid and serum samples. The detectable tRFs were then compared in these fluids from control, AD, and mild cognitive impairment patients using tRF qRT-PCR. The stability of tRFs in serum was also investigated by checking the change in tRFs in response to protein digestion or exosome lysis. Results: Among various tRFs, tRF5-ProAGG seemed to be impacted by AD in both cerebrospinal fluid and serum. AD-impacted serum tRF5-ProAGG showed a correlation with the AD stage. Putative targets of tRF5-ProAGG in the hippocampus were also predicted by a computational algorithm, with some targets being validated experimentally and one of them being in a negative correlation with tRF5-ProAGG even using a small size of samples. Conclusions: tRF5-ProAGG showed the potential as an AD biomarker and may play a role in disease progression. Show more

Keywords: Alzheimer’s disease, biomarker, cerebrospinal fluid, serum, tRNA-derived RNA fragments

DOI: 10.3233/JAD-230412

Citation: Journal of Alzheimer's Disease, vol. 96, no. 3, pp. 1285-1304, 2023

Authors: Perron, Jarrad | Scramstad, Carly | Ko, Ji Hyun

Article Type: Research Article

Abstract: Background: The approval of lecanemab for the treatment of Alzheimer’s disease (AD) by the Food and Drug Administration in the United States has sparked controversy over issues of safety, cost, and efficacy. Furthermore, the prognostication of cognitive decline is prohibitively difficult with current methods. The inability to forecast incipient dementia in patients with biological AD suggests a prophylactic scenario wherein all patients with cognitive decline are prescribed anti-AD drugs at the earliest manifestations of dementia; however, most patients with mild cognitive impairment (approximately 77.7%) do not develop dementia over a 3-year period. Prophylactic response therefore constitutes unethical, costly, and unnecessary …treatment for these patients. Objective: We present a snapshot of the costs associated with the first 3 years of mass availability of anti-AD drugs in a variety of scenarios. Methods: We consider multiple prognostication scenarios with varying sensitivities and specificities based on neuroimaging studies in patients with mild cognitive impairment to determine approximate costs for the large-scale use of lecanemab. Results: The combination of fluorodeoxyglucose and magnetic resonance was determined to be the most cost-efficient at $177,000 for every positive outcome every 3 years under an assumed adjustment in the price of lecanemab to $9,275 per year. Conclusions: Imaging-assisted identification of cognitive status in patients with prodromal AD is demonstrated to reduce costs and prevent instances of unnecessary treatment in all cases considered. This highlights the potential of this technology for the ethical prescription of anti-AD medications under a paradigm of imaging-assisted early detection for pharmaceutical intervention in the treatment of AD. Show more

Keywords: Alzheimer’s disease, biomarker, deep learning, dementia, mild cognitive impairment, pharmaceutical

DOI: 10.3233/JAD-230633

Citation: Journal of Alzheimer's Disease, vol. 96, no. 3, pp. 1305-1315, 2023

Authors: Michopoulou, Sofia | Prosser, Angus | Dickson, John | Guy, Matthew | Teeling, Jessica L. | Kipps, Christopher

Article Type: Research Article

Abstract: Background: Single photon emission tomography (SPECT) can detect early changes in brain perfusion to support the diagnosis of dementia. Inflammation is a driver for dementia progression and measures of inflammation may further support dementia diagnosis. Objective: In this study, we assessed whether combining imaging with markers of inflammation improves prediction of the likelihood of Alzheimer’s disease (AD). Methods: We analyzed 91 participants datasets (Institutional Ethics Approval 20/NW/0222). AD biomarkers and markers of inflammation were measured in cerebrospinal fluid. Statistical parametric mapping was used to quantify brain perfusion differences in perfusion SPECT images. Logistic regression models were …trained to evaluate the ability of imaging and inflammation markers, both individually and combined, to predict AD. Results: Regional perfusion reduction in the precuneus and medial temporal regions predicted Aβ42 status. Increase in inflammation markers predicted tau and neurodegeneration. Matrix metalloproteneinase-10, a marker of blood-brain barrier regulation, was associated with perfusion reduction in the right temporal lobe. Adenosine deaminase, an enzyme involved in sleep homeostasis and inflammation, was the strongest predictor of neurodegeneration with an odds ratio of 10.3. The area under the receiver operator characteristic curve for the logistic regression model was 0.76 for imaging and 0.76 for inflammation. Combining inflammation and imaging markers yielded an area under the curve of 0.85. Conclusions: Study results showed that markers of brain perfusion imaging and markers of inflammation provide complementary information in AD evaluation. Inflammation markers better predict tau status while perfusion imaging measures represent amyloid status. Combining imaging and inflammation improves AD prediction. Show more

Keywords: Alzheimer’s disease, biomarkers, cerebrospinal fluid, inflammation, perfusion, SPECT

DOI: 10.3233/JAD-230726

Citation: Journal of Alzheimer's Disease, vol. 96, no. 3, pp. 1317-1327, 2023

Authors: Tu, Min-Chien | Chung, Hsiao-Wen | Hsu, Yen-Hsuan | Yang, Jir-Jei | Wu, Wen-Chau

Article Type: Research Article

Abstract: Background: Cobalamin (Cbl) and folate are common supplements clinicians prescribe as an adjuvant therapy for dementia patients, on the presumption of their neurotrophic and/or homocysteine (Hcy) lowering effect. However, the treatment efficacy has been found mixed and the effects of Cbl/folate/Hcy on the human brain remain to be elucidated. Objective: To explore the neurovascular correlates of Cbl/folate/Hcy in Alzheimer’s disease (AD) and subcortical ischemic vascular dementia (SIVD). Methods: Sixty-seven AD patients and 57 SIVD patients were prospectively and consecutively recruited from an outpatient clinic. Multimodal 3-Tesla magnetic resonance imaging was performed to quantitatively evaluate cerebral blood …flow (CBF) and white matter integrity. The relationship between neuroimaging metrics and the serum levels of Cbl/folate/Hcy was examined by using the Kruskal-Wallis test, partial correlation analysis, and moderation analysis, at a significance level of 0.05. Results: As a whole, CBF mainly associated with Cbl/folate while white matter hyperintensities exclusively associated with Hcy. As compared with AD, SIVD exhibited more noticeable CBF correlates (spatially widespread with Cbl and focal with folate). In SIVD, a bilateral Cbl-moderated CBF coupling was found between medial prefrontal cortex and ipsilateral basal ganglia, while in the fronto-subcortical white matter tracts, elevated Hcy was associated with imaging metrics indicative of increased injury in both axon and myelin sheath. Conclusions: We identified the neurovascular correlates of previously reported neurotrophic effect of Cbl/folate and neurotoxic effect of Hcy in dementia. The correlates exhibited distinct patterns in AD and SIVD. The findings may help improving the formulation of supplemental Cbl/folate treatment for dementia. Show more

Keywords: Alzheimer’s disease, cerebral blood flow, cobalamin, homocysteine, magnetic resonance imaging, vascular dementia

DOI: 10.3233/JAD-230763

Citation: Journal of Alzheimer's Disease, vol. 96, no. 3, pp. 1329-1338, 2023