Related Experiment Video
Updated: Jun 9, 2026

Sequential Extraction of Soluble and Insoluble Alpha-Synuclein from Parkinsonian Brains
Published on: January 5, 2016
Atrophy signature for alpha-synuclein copathology in Alzheimer's disease
Diana Esteller-Gauxax1,2, Núria Guillén1,3, Neus Falgàs1,3
1Alzheimer's disease and other cognitive disorders Group, Service of Neurology Hospital Clínic de Barcelona, Fundació Recerca Clínic Barcelona-IDIBAPS Barcelona Spain.
Introduction:
Brain atrophy patterns in Alzheimer's disease (AD) are well established, however, the contribution of alpha-synuclein (α-syn) copathology to these patterns remains unclear. This study investigates magnetic resonance imaging (MRI) -based atrophy patterns in AD patients with α-syn copathology.
Methods:
We study two independent cohorts: Hospital Clinic Barcelona (N = 139) and Alzheimer's Disease Neuroimaging Initiative (ADNI) (N = 191). Participants were classified into AD-α-syn seed amplification assay positive (αSAA+), AD-αSAA-, and healthy controls (CTR). Group comparisons of MRI regions were conducted using permutation tests adjusting for age and sex.
Results:
Compared to CTR, both AD-αSAA- and AD-αSAA+ showed widespread cortical thinning. Direct comparison of AD-αSAA+ versus AD-αSAA- revealed differential involvement of insular, entorhinal, lateral temporal, pre and postcentral gyrus, frontal cortices, and amygdala, although with minimum size effect.
Discussion:
α-Syn copathology was associated with more extensive and pronounced atrophy, especially in frontal, lateral temporal, entorhinal, and amygdalar regions. This suggests that α-syn is associated with greater neurodegeneration beyond typical AD patterns.
More Related Videos
08:33Targeting Alpha Synuclein Aggregates in Cutaneous Peripheral Nerve Fibers by Free-floating Immunofluorescence Assay
Published on: June 25, 2019
12:01Detection of Disease-associated α-synuclein by Enhanced ELISA in the Brain of Transgenic Mice Overexpressing Human A53T Mutated α-synuclein
Published on: May 30, 2015
Related Concept Videos
Alzheimer Disease ll: Pathophysiology
Parkinson Disease ll: Pathophysiology
Alzheimer Disease l: Introduction
Alzheimer's Disease: Overview
The clinical diagnosis of AD hinges on the presence of memory and other cognitive impairments. Biomarkers, such as changes in Aβ and tau...
Dementia l: Introduction
Neural Regulation