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A proteome is the entire set of proteins that a cell type produces. We can study proteomes using the knowledge of genomes because genes code for mRNAs, and the mRNAs encode proteins. Although mRNA analysis is a step in the right direction, not all mRNAs are translated into proteins.
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Related Experiment Video

Updated: Sep 21, 2025

Quantitative Proteomics Workflow using Multiple Reaction Monitoring Based Detection of Proteins from Human Brain Tissue
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Quantitative Proteomics Workflow using Multiple Reaction Monitoring Based Detection of Proteins from Human Brain Tissue

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Brain proteome profiling implicates the complement and coagulation cascade in multiple system atrophy brain

Rasmus Rydbirk1,2,3, Ole Østergaard4, Jonas Folke1,2

  • 1Centre for Neuroscience and Stereology, Copenhagen University Hospital, Bispebjerg and Frederiksberg Hospital, 2400, Copenhagen NW, Denmark.

Cellular and Molecular Life Sciences : CMLS
|June 3, 2022
PubMed
Summary

This study reveals that fibrinolysis and immune system activation in the brain contribute to Multiple System Atrophy (MSA) progression. These findings highlight potential therapeutic targets for this rare neurodegenerative disease.

Keywords:
Atypical parkinsonismBlood–brain barrierCoagulation factorsFibrinogenMovement disorderNeuro-inflammationProteomics

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Area of Science:

  • Neuroscience
  • Proteomics
  • Immunology

Background:

  • Multiple system atrophy (MSA) is a rare, progressive neurodegenerative disorder with unknown etiology.
  • Neuro-inflammation and vascular disruption are suspected contributing factors to MSA.
  • This study investigates the molecular neuropathology of MSA using deep proteome profiling.

Purpose of the Study:

  • To identify disease-relevant molecular processes in the prefrontal cortex of MSA patients.
  • To validate ex vivo findings in plasma and cerebrospinal fluid (CSF) from MSA patient cohorts.
  • To explore proteomic differences in MSA compared to other parkinsonian disorders.

Main Methods:

  • Deep proteome profiling of prefrontal cortex from 45 MSA patients and 30 controls using LC-MS/MS.
  • Validation using western blotting, immuno-capture, immunohistochemistry, and immunofluorescence.
  • Proteomic analysis of 144 CSF samples and plasma biomarkers (GFAP, NFL) in MSA and control cohorts.

Main Results:

  • Over 4,000 proteins quantified, with 49 differentially expressed proteins identified in MSA.
  • Enrichment of fibrinolysis and complement cascade activation pathways observed.
  • Increased fibrinogen (FGB) levels, IgG recognition of FGB, and blood-brain barrier leakage (elevated GFAP/NFL) confirmed in MSA patients.

Conclusions:

  • Activation of the fibrinolytic cascade and immune system are implicated in MSA pathogenesis.
  • These processes correlate with a more severe disease course in MSA.
  • Elevated fibrinogen and immune components in CSF are also observed in other atypical parkinsonian disorders, but not Parkinson's disease.