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Therriault J, Ashton NJ, Pola I, Triana-Baltzer G, Brum WS, Di Molfetta G, Arslan B, Rahmouni N, Tissot C, Servaes S, Stevenson J, Macedo AC, Pascoal TA, Kolb HC, Jeromin A, Blennow K, Zetterberg H, Rosa-Neto P, Benedet AL. Comparison of two plasma p-tau217 assays to detect and monitor Alzheimer's pathology. EBioMedicine 2024; 102:105046. [PMID: 38471397 PMCID: PMC10943661 DOI: 10.1016/j.ebiom.2024.105046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 02/19/2024] [Accepted: 02/21/2024] [Indexed: 03/14/2024] Open
Abstract
BACKGROUND Blood-based biomarkers of Alzheimer's disease (AD) have become increasingly important as scalable tools for diagnosis and determining clinical trial eligibility. P-tau217 is the most promising due to its excellent sensitivity and specificity for AD-related pathological changes. METHODS We compared the performance of two commercially available plasma p-tau217 assays (ALZpath p-tau217 and Janssen p-tau217+) in 294 individuals cross-sectionally. Correlations with amyloid PET and tau PET were assessed, and Receiver Operating Characteristic (ROC) analyses evaluated both p-tau217 assays for identifying AD pathology. FINDINGS Both plasma p-tau217 assays were strongly associated with amyloid and tau PET. Furthermore, both plasma p-tau217 assays identified individuals with AD vs other neurodegenerative diseases (ALZpath AUC = 0.95; Janssen AUC = 0.96). Additionally, plasma p-tau217 concentrations rose with AD severity and their annual changes correlated with tau PET annual change. INTERPRETATION Both p-tau217 assays had excellent diagnostic performance for AD. Our study supports the future clinical use of commercially-available assays for p-tau217. FUNDING This research is supported by the Weston Brain Institute, Canadian Institutes of Health Research (CIHR), Canadian Consortium on Neurodegeneration in Aging, the Alzheimer's Association, Brain Canada Foundation, the Fonds de Recherche du Québec - Santé and the Colin J. Adair Charitable Foundation.
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O'Connor A, Abel E, Benedet AL, Poole T, Ashton N, Weston PSJ, Heslegrave AJ, Ryan N, Barker S, Polke JM, Blennow K, Zetterberg H, Fox NC. Plasma GFAP in presymptomatic and symptomatic familial Alzheimer's disease: a longitudinal cohort study. J Neurol Neurosurg Psychiatry 2023; 94:90-92. [PMID: 35948396 PMCID: PMC9763156 DOI: 10.1136/jnnp-2022-329663] [Citation(s) in RCA: 13] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/28/2022] [Accepted: 07/19/2022] [Indexed: 02/02/2023]
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Pascoal TA, Leuzy A, Therriault J, Chamoun M, Lussier F, Tissot C, Strandberg O, Palmqvist S, Stomrud E, Ferreira PCL, Ferrari‐Souza JP, Smith R, Benedet AL, Gauthier S, Hansson O, Rosa‐Neto P. Discriminative accuracy of the A/T/N scheme to identify cognitive impairment due to Alzheimer's disease. ALZHEIMER'S & DEMENTIA (AMSTERDAM, NETHERLANDS) 2023; 15:e12390. [PMID: 36733847 PMCID: PMC9886860 DOI: 10.1002/dad2.12390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/12/2022] [Revised: 11/09/2022] [Accepted: 11/29/2022] [Indexed: 02/03/2023]
Abstract
Introduction The optimal combination of amyloid-β/tau/neurodegeneration (A/T/N) biomarker profiles for the diagnosis of Alzheimer's disease (AD) dementia is unclear. Methods We examined the discriminative accuracy of A/T/N combinations assessed with neuroimaging biomarkers for the differentiation of AD from cognitively unimpaired (CU) elderly and non-AD neurodegenerative diseases in the TRIAD, BioFINDER-1 and BioFINDER-2 cohorts (total n = 832) using area under the receiver operating characteristic curves (AUC). Results For the diagnosis of AD dementia (vs. CU elderly), T biomarkers performed as well as the complete A/T/N system (AUC range: 0.90-0.99). A and T biomarkers in isolation performed as well as the complete A/T/N system in differentiating AD dementia from non-AD neurodegenerative diseases (AUC range; A biomarker: 0.84-1; T biomarker: 0.83-1). Discussion In diagnostic settings, the use of A or T neuroimaging biomarkers alone can reduce patient burden and medical costs compared with using their combination, without significantly compromising accuracy.
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Ziff OJ, Ashton NJ, Mehta PR, Brown R, Athauda D, Heaney J, Heslegrave AJ, Benedet AL, Blennow K, Checkley AM, Houlihan CF, Gauthier S, Rosa‐Neto P, Fox NC, Schott JM, Zetterberg H, Benjamin LA, Paterson RW. Amyloid processing in COVID-19-associated neurological syndromes. J Neurochem 2022; 161:146-157. [PMID: 35137414 PMCID: PMC9115071 DOI: 10.1111/jnc.15585] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 01/15/2022] [Accepted: 01/31/2022] [Indexed: 11/29/2022]
Abstract
SARS-CoV-2 infection can damage the nervous system with multiple neurological manifestations described. However, there is limited understanding of the mechanisms underlying COVID-19 neurological injury. This is a cross-sectional exploratory prospective biomarker cohort study of 21 patients with COVID-19 neurological syndromes (Guillain-Barre Syndrome [GBS], encephalitis, encephalopathy, acute disseminated encephalomyelitis [ADEM], intracranial hypertension, and central pain syndrome) and 23 healthy COVID-19 negative controls. We measured cerebrospinal fluid (CSF) and serum biomarkers of amyloid processing, neuronal injury (neurofilament light), astrocyte activation (GFAp), and neuroinflammation (tissue necrosis factor [TNF] ɑ, interleukin [IL]-6, IL-1β, IL-8). Patients with COVID-19 neurological syndromes had significantly reduced CSF soluble amyloid precursor protein (sAPP)-ɑ (p = 0.004) and sAPPβ (p = 0.03) as well as amyloid β (Aβ) 40 (p = 5.2 × 10-8 ), Aβ42 (p = 3.5 × 10-7 ), and Aβ42/Aβ40 ratio (p = 0.005) compared to controls. Patients with COVID-19 neurological syndromes showed significantly increased neurofilament light (NfL, p = 0.001) and this negatively correlated with sAPPɑ and sAPPβ. Conversely, GFAp was significantly reduced in COVID-19 neurological syndromes (p = 0.0001) and this positively correlated with sAPPɑ and sAPPβ. COVID-19 neurological patients also displayed significantly increased CSF proinflammatory cytokines and these negatively correlated with sAPPɑ and sAPPβ. A sensitivity analysis of COVID-19-associated GBS revealed a non-significant trend toward greater impairment of amyloid processing in COVID-19 central than peripheral neurological syndromes. This pilot study raises the possibility that patients with COVID-19-associated neurological syndromes exhibit impaired amyloid processing. Altered amyloid processing was linked to neuronal injury and neuroinflammation but reduced astrocyte activation.
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Savard M, Pascoal TA, Servaes S, Dhollander T, Iturria-Medina Y, Kang MS, Vitali P, Therriault J, Mathotaarachchi S, Benedet AL, Gauthier S, Rosa-Neto P. Impact of long- and short-range fiber depletion on the cognitive deficits of fronto-temporal dementia. eLife 2022; 11:73510. [PMID: 35073256 PMCID: PMC8824472 DOI: 10.7554/elife.73510] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Accepted: 01/23/2022] [Indexed: 11/21/2022] Open
Abstract
Recent studies suggest a framework where white-matter (WM) atrophy plays an important role in fronto-temporal dementia (FTD) pathophysiology. However, these studies often overlook the fact that WM tracts bridging different brain regions may have different vulnerabilities to the disease and the relative contribution of grey-matter (GM) atrophy to this WM model, resulting in a less comprehensive understanding of the relationship between clinical symptoms and pathology. Using a common factor analysis to extract a semantic and an executive factor, we aimed to test the relative contribution of WM and GM of specific tracts in predicting cognition in the Frontotemporal Lobar Degeneration Neuroimaging Initiative (FTLDNI). We found that semantic symptoms were mainly dependent on short-range WM fibre disruption, while damage to long-range WM fibres was preferentially associated to executive dysfunction with the GM contribution to cognition being predominant for local processing. These results support the importance of the disruption of specific WM tracts to the core cognitive symptoms associated with FTD. As large-scale WM tracts, which are particularly vulnerable to vascular disease, were highly associated with executive dysfunction, our findings highlight the importance of controlling for risk factors associated with deep WM disease, such as vascular risk factors, in patients with FTD in order not to potentiate underlying executive dysfunction.
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Stevenson J, Chamoun M, Pascoal TA, Benedet AL, Kang MS, Mathotaarachchi S, Therriault J, Thomas E, Savard M, Tissot C, Kunach P, Lussier FZ, Gauthier S, Rosa-Neto P. IC-P-146: THE TRANSLATIONAL BIOMARKERS IN AGING AND DEMENTIA: TRIAD, A BIOMARKER ORIENTED COHORT. Alzheimers Dement 2019. [DOI: 10.1016/j.jalz.2019.06.4260] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Brum WS, Bieger A, Schu Peixoto GG, Pascoal TA, Benedet AL, Rosa-Neto P, Zimmer ER. O2-03-01: AMYLOIDOSIS INDUCES EARLY METABOLIC REORGANIZATION. Alzheimers Dement 2019. [DOI: 10.1016/j.jalz.2019.06.4463] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Bieger A, Zimmer ER, Benedet AL, Pascoal TA, Brum WS, Souza DO, Rosa-Neto P. P1‐005: DIFFERENT DIAGNOSIS GUIDELINES ON THE ALZHEIMER'S DISEASE CONTINUUM. Alzheimers Dement 2019. [DOI: 10.1016/j.jalz.2019.06.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Therriault J, Pascoal TA, Savard M, Chamoun M, Mathotaarachchi S, Benedet AL, Kang MS, Tissot C, Lussier FZ, Kunach P, Iqbal Qureshi MN, Thomas E, Massarweh G, Gauthier S, Rosa-Neto P. IC‐P‐182: AMYLOID‐DEPENDENT AND AMYLOID‐INDEPENDENT EFFECTS OF TAU ON CLINICAL STATUS. Alzheimers Dement 2019. [DOI: 10.1016/j.jalz.2019.06.4297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Pascoal TA, Chamoun M, Kang MS, Benedet AL, Therriault J, Savard M, Mathotaarachchi S, Tissot C, Iqbal Qureshi MN, Lussier FZ, Parson M, Massarweh G, Soucy JP, Gauthier S, Rosa-Neto P. IC-02-02: LONGITUDINAL EVALUATION OF TAU PROPAGATION USING [ 18
F]MK-6240. Alzheimers Dement 2019. [DOI: 10.1016/j.jalz.2019.06.4146] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Benedet AL, Leuzy A, Pascoal TA, Ashton NJ, Mathotaarachchi S, Savard M, Therriault J, Kang MS, Chamoun M, Schöll M, Gauthier S, Zetterberg H, Blennow K, Rosa-Neto P. O1‐07‐02: LONGITUDINAL ASSOCIATIONS BETWEEN PLASMA NFL AND VOXEL‐BASED MORPHOMETRY IN ALZHEIMER'S DISEASE. Alzheimers Dement 2019. [DOI: 10.1016/j.jalz.2019.06.4554] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Benedet AL, Leuzy A, Pascoal TA, Ashton NJ, Mathotaarachchi S, Savard M, Therriault J, Kang MS, Chamoun M, Tissot C, Kunach P, Lussier FZ, Joung MJ, Schöll M, Gauthier S, Zetterberg H, Rosa-Neto P, Blennow K. P1-274: ASSOCIATIONS BETWEEN PLASMA NFL AND BRAIN ATROPHY IN ALZHEIMER'S DISEASE. Alzheimers Dement 2019. [DOI: 10.1016/j.jalz.2019.06.829] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Mathotaarachchi S, Pascoal TA, Benedet AL, Chamoun M, Kang MS, Therriault J, Savard M, Lussier FZ, Tissot C, Thomas E, Fonov VS, Gauthier S, Rosa-Neto P. P4-327: SUBTHRESHOLD LEVEL TAU DEPOSITION OCCURS PRIOR TO SUBTHRESHOLD AMYLOID DEPOSITION IN COGNITIVELY NORMAL ELDERLY INDIVIDUALS. Alzheimers Dement 2019. [DOI: 10.1016/j.jalz.2019.06.3997] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Wachtelaer E, Savard M, Rudko D, Kang MS, Pascoal TA, Mathotaarachchi S, Therriault J, Chamoun M, Benedet AL, Thomas E, Parson M, Tissot C, Lussier FZ, Gauthier S, Rosa-Neto P. IC-P-132: CORTICAL IRON DEPOSITION IN ALZHEIMER'S DISEASE CONTRASTS WITH AGE-RELATED SUBCORTICAL DEPOSITION. Alzheimers Dement 2019. [DOI: 10.1016/j.jalz.2019.06.4246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Kang MS, Pascoal TA, Shin M, Chamoun M, Mathotaarachchi S, Benedet AL, Therriault J, Savard M, Bouhachi R, Hsiao C, Thomas E, Chartrand D, Lussier FZ, Tissot C, Iqbal Qureshi MN, Soucy JP, Massarweh G, Rosa-Neto P. IC-P-168: ISSUES REGARDING [ 18
F]MK6240 REFERENCE REGION SELECTION BASED ON THE FULL KINETIC MODELING. Alzheimers Dement 2019. [DOI: 10.1016/j.jalz.2019.06.4283] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Savard M, Pascoal TA, Mathotaarachchi S, Therriault J, Kang MS, Iqbal Qureshi MN, Chamoun M, Benedet AL, Thomas E, Parson M, Tissot C, Lussier FZ, Gauthier S, Rosa-Neto P. O3-07-03: DECREASED WHITE MATTER FIBER CROSS-SECTION IS ASSOCIATED TO NORMAL AGING AND HIGHER TAU DEPOSITION INDEPENDENTLY OF AMYLOID. Alzheimers Dement 2019. [DOI: 10.1016/j.jalz.2019.06.4662] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Mathotaarachchi S, Pascoal TA, Benedet AL, Chamoun M, Kang MS, Therriault J, Savard M, Lussier FZ, Tissot C, Thomas E, Fonov VS, Gauthier S, Rosa-Neto P. IC-P-170: SUBTHRESHOLD LEVEL TAU DEPOSITION OCCURS PRIOR TO SUBTHRESHOLD AMYLOID DEPOSITION IN COGNITIVELY NORMAL ELDERLY INDIVIDUALS. Alzheimers Dement 2019. [DOI: 10.1016/j.jalz.2019.06.4285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Benedet AL, Leuzy A, Pascoal TA, Ashton NJ, Mathotaarachchi S, Savard M, Therriault J, Kang MS, Chamoun M, Tissot C, Lussier FZ, Kunach P, Joung MJ, Schöll M, Gauthier S, Zetterberg H, Rosa-Neto P, Blennow K. IC-P-071: ASSOCIATIONS BETWEEN PLASMA NFL AND BRAIN ATROPHY IN ALZHEIMER'S DISEASE. Alzheimers Dement 2019. [DOI: 10.1016/j.jalz.2019.06.4914] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Wachtelaer E, Savard M, Rudko D, Kang MS, Pascoal TA, Mathotaarachchi S, Therriault J, Chamoun M, Benedet AL, Thomas E, Tissot C, Lussier FZ, Parson M, Gauthier S, Rosa-Neto P. P2-403: CORTICAL IRON DEPOSITION IN ALZHEIMER'S DISEASE CONTRASTS WITH AGE-RELATED SUBCORTICAL DEPOSITION. Alzheimers Dement 2019. [DOI: 10.1016/j.jalz.2019.06.2810] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Iqbal Qureshi MN, Gauthier S, Rosa-Neto P, Mathotaarachchi S, Benedet AL, Chamoun M, Kang MS, Therriault J, Pascoal TA, Thomas E, Kunach P, Tissot C, Lussier FZ, Savard M. P2-346: TAU AND AMYLOID PATHOLOGY SUPPRESS GLOBAL BRAIN FUNCTIONAL CONNECTIVITY. Alzheimers Dement 2019. [DOI: 10.1016/j.jalz.2019.06.2753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Benedet AL, Mathotaarachchi S, Pascoal TA, Medina YI, Savard M, Therriault J, Kang MS, Chamoun M, Gauthier S, Evans AC, Labbe A, Rosa-Neto P. P1‐148: THE EFFECT OF PROTON PUMP INHIBITORS AND
CYP2C19
ON AMYLOID PATHOLOGY. Alzheimers Dement 2018. [DOI: 10.1016/j.jalz.2018.06.151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Pascoal TA, Chamoun M, Kang MS, Shin M, Mathotaarachchi S, Therriault J, Savard M, Benedet AL, Thomas E, Massarweh G, Soucy JP, Gauthier S, Rosa-Neto P. IC‐P‐213: [
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F]MK6240 PET TAU BINDING IN ATYPICAL AD AND NON‐AD TAUOPATHIES. Alzheimers Dement 2018. [DOI: 10.1016/j.jalz.2018.06.2280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Kang MS, Shin M, Mathotaarachchi S, Pascoal TA, Parent MJ, Benedet AL, Therriault J, Chamoun M, Savard M, Thomas E, Aliaga A, Massarweh G, Soucy JP, Gauthier S, Cuello AC, Rosa-Neto P. P3‐338: AMYLOID AND MICROGLIAL ACTIVATION SYNERGY LEADS TO HYPOMETABOLISM IN AD BRAIN: MICROPET LONGITUDINAL STUDY. Alzheimers Dement 2018. [DOI: 10.1016/j.jalz.2018.06.1699] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Pascoal TA, Chamoun M, Benedet AL, Shin M, Mathotaarachchi S, Kang MS, Therriault J, Savard M, Thomas E, Massarweh G, Soucy JP, Gauthier S, Rosa-Neto P. P1‐482: ASSOCIATION OF [
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F]MK6240 PET TAU BINDING WITH CLINICAL DIAGNOSIS, APOE4, COGNITION, AMYLOID, AGE, AND BRAAK STAGES ACROSS THE AD CLINICAL SPECTRUM. Alzheimers Dement 2018. [DOI: 10.1016/j.jalz.2018.06.492] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Benedet AL, Pascoal TA, Chamoun M, Savard M, Schoemaker D, Mathotaarachchi S, Kang MS, Therriault J, Collins L, Gauthier S, Poirier J, Labbe A, Rosa-Neto P. IC‐P‐064: THE IMPACT OF TSPO RS6971 POLYMORPHISM IN A CANADIAN NEUROIMAGING STUDY OF NEUROINFLAMMATION. Alzheimers Dement 2018. [DOI: 10.1016/j.jalz.2018.06.2129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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