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Updated: Feb 14, 2026

Visualization of Amyloid β Deposits in the Human Brain with Matrix-assisted Laser Desorption/Ionization Imaging Mass Spectrometry
09:31

Visualization of Amyloid β Deposits in the Human Brain with Matrix-assisted Laser Desorption/Ionization Imaging Mass Spectrometry

Published on: March 7, 2019

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Detection of Amyloid Beta (Aβ) Oligomeric Composition Using Matrix-Assisted Laser Desorption Ionization Mass

Jasmine S-H Wang1,2,3, Shawn N Whitehead3, Ken K-C Yeung4,5

  • 1Department of Chemistry, University of Western Ontario, London, ON, N6A 5B7, Canada.

Journal of the American Society for Mass Spectrometry
|February 22, 2018
PubMed

Insights

Matrix-assisted laser desorption/ionization mass spectrometry (MALDI MS) directly detects amyloid-beta (Aβ) oligomers by mass. This method accurately quanties Aβ oligomer size distribution and composition, validated through multiple experiments.

Area of Science:

  • Biochemistry
  • Analytical Chemistry
  • Neuroscience

Background:

  • Amyloid-beta (Aβ) oligomers are implicated in neurodegenerative diseases.
  • Accurate detection and characterization of Aβ oligomers are crucial for understanding disease mechanisms.

Purpose of the Study:

  • To evaluate matrix-assisted laser desorption/ionization mass spectrometry (MALDI MS) as a method for detecting and quantifying Aβ oligomers.
  • To validate the accuracy and reliability of MALDI MS for assessing Aβ sample composition.

Main Methods:

  • MALDI MS was used to analyze Aβ peptides with varying aggregation propensities.
  • Mass spectra were analyzed to determine oligomer size distribution.
  • Validation included comparison with modified peptides, in vitro toxicity studies, and molecular weight cutoff filtration.

Main Results:

  • MALDI MS directly detected Aβ oligomers as singly charged ions, with spectra reflecting oligomer size distribution.
  • Higher multimer intensities correlated with increased aggregation propensity.
  • MALDI MS accurately identified changes in Aβ composition before and after oligomerization.
  • Filtration experiments confirmed the removal of specific oligomer sizes.

Conclusions:

  • MALDI MS is a validated, fast, and direct method for assessing the monomeric/multimeric composition of Aβ samples.
  • The technique provides reliable insights into Aβ oligomerization relevant to disease research.
Keywords:
Alzheimer’s diseaseAmyloid beta-derived diffusible ligand (ADDL)Embryonic rat cortical neuronsIn vitro toxicity assayNon-covalent complexesOligomersProtein aggregation

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