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000283096 0247_ $$2ISSN$$a1552-5279
000283096 037__ $$aDZNE-2025-01503
000283096 041__ $$aEnglish
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000283096 1001_ $$0P:(DE-2719)9000373$$aKindler, Christine$$b0$$eFirst author$$udzne
000283096 1112_ $$aAlzheimer’s Association International Conference$$cToronto$$d2025-07-27 - 2025-07-31$$gAAIC 25$$wCanada
000283096 245__ $$aNucleus Basalis of Meynert: Functional Connectivity and Morphometry in Alzheimer’s Disease and Frontotemporal Dementia
000283096 260__ $$c2025
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000283096 520__ $$aThe nucleus basalis of Meynert (NBM) is crucial for learning, attention, and memory. While its involvement in Alzheimer's disease (AD) has been widely reported, the role in frontotemporal dementia (FTD) remains unclear. Here we examined NBM functional connectivity (FC) as well as NBM and cortical volume changes in AD, healthy controls (HC), and FTD subtypes: behavioral variant FTD (bvFTD), unclassified primary progressive aphasia (PPA), progressive nonfluent aphasia (PNFA), semantic dementia (SemD), and progressive logopenic aphasia (PLA).Resting-state fMRI and T1-weighted scans were collected from HC (n = 66), individuals with AD (n = 50), bvFTD (n = 63), PLA (n = 18), PPA (n = 20), PNFA (n = 32), and SemD (n = 15). We performed seed-based FC analyses in FSL with left and right NBM as seeds. We compared HC with AD (cluster-based threshold z > 2.3, p < 0.05). Significant clusters were used to extract mean FC for the other groups. We then compared FC values and normalized NBM volumes across HC and FTD subtypes using the Kruskal-Wallis test, followed by Bonferroni-corrected pairwise comparisons where applicable. Voxel-based morphometry (VBM) was conducted to explore cortical atrophy patterns.HC showed stronger NBM connectivity than AD in the hippocampus/parahippocampal gyrus, frontal pole, paracingulate cortex, precuneus, and lateral occipital cortex (Figure 1, left NBM results). Across HC and FTD subtypes, we found significant group differences for the paracingulate (H = 36.15, p < 0.001) and lateral occipital cortex (H = 18.25, p = 0.003). Connectivity was higher in bvFTD, PPA, and LPA than in HC, with the strongest effect for bvFTD in the paracingulate cortex (r = 0.48) and moderate effects across other contrasts (r = 0.28-0.42, all p < 0.020). Volumetric analyses indicated no significant group differences in NBM volumes but distinct cortical atrophy patterns: PNFA, PLA, and PPA exhibited temporal- frontal atrophy similar to AD, while bvFTD showed predominantly frontal and SemD primarily temporal atrophy.Differential functional connectivity of the NBM and distinct cortical atrophy patterns were observed between HC and AD and between HC and FTD subtypes. Ongoing analyses on subgroup comparisons and integration of cognitive assessments aim to elucidate these relationships and their clinical implications.
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000283096 650_2 $$2MeSH$$aHumans
000283096 650_2 $$2MeSH$$aAlzheimer Disease: diagnostic imaging
000283096 650_2 $$2MeSH$$aAlzheimer Disease: pathology
000283096 650_2 $$2MeSH$$aAlzheimer Disease: physiopathology
000283096 650_2 $$2MeSH$$aMale
000283096 650_2 $$2MeSH$$aFemale
000283096 650_2 $$2MeSH$$aMagnetic Resonance Imaging
000283096 650_2 $$2MeSH$$aAged
000283096 650_2 $$2MeSH$$aFrontotemporal Dementia: diagnostic imaging
000283096 650_2 $$2MeSH$$aFrontotemporal Dementia: pathology
000283096 650_2 $$2MeSH$$aFrontotemporal Dementia: physiopathology
000283096 650_2 $$2MeSH$$aMiddle Aged
000283096 650_2 $$2MeSH$$aBasal Nucleus of Meynert: diagnostic imaging
000283096 650_2 $$2MeSH$$aBasal Nucleus of Meynert: pathology
000283096 650_2 $$2MeSH$$aBasal Nucleus of Meynert: physiopathology
000283096 650_2 $$2MeSH$$aAphasia, Primary Progressive
000283096 7001_ $$aGillis, Grace$$b1
000283096 7001_ $$aBhalerao, Gaurav V$$b2
000283096 7001_ $$aAndersson, Jesper L R$$b3
000283096 7001_ $$aMcCarthy, Paul$$b4
000283096 7001_ $$0P:(DE-2719)2810438$$aMiklitz, Carolin$$b5$$udzne
000283096 7001_ $$0P:(DE-2719)2810538$$aStoecker, Tony$$b6$$udzne
000283096 7001_ $$0P:(DE-2719)2810273$$aPetzold, Gabor C$$b7$$udzne
000283096 7001_ $$aGriffanti, Ludovica$$b8
000283096 773__ $$0PERI:(DE-600)2201940-6$$a10.1002/alz70862_110164$$gVol. 21 Suppl 8, no. Suppl 8, p. e110164$$nSuppl 8$$pe110164$$tAlzheimer's and dementia$$v21$$x1552-5260$$y2025
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