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Autophagy is a self-digesting process by which a cell protects itself from threats both within and outside the cell, ranging from abnormal proteins to invading bacteria. In this process, obsolete components of the cell and invading microbes are degraded by hydrolytic enzymes active in an acidic environment of the lysosomal lumen.
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Lysosomes are the site for the degradation of macromolecules and biological polymers released during membrane trafficking events such as secretory, endocytic, autophagic, and phagocytic pathways. The membrane-enclosed area of the lysosome, called the lumen, contains hydrolytic enzymes active in an acidic environment. These acid hydrolases are functional at a pH between 4.5 and 5 and are involved in cellular processes such as cell signaling, energy metabolism, restoration of the plasma membrane,...
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Related Experiment Video

Updated: Oct 12, 2025

Sequential Extraction of Soluble and Insoluble Alpha-Synuclein from Parkinsonian Brains
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Autophagy in α-Synucleinopathies-An Overstrained System.

Lisa Fellner1, Elisa Gabassi1, Johannes Haybaeck2,3

  • 1Department of Genomics, Stem Cell Biology and Regenerative Medicine, Institute of Molecular Biology & CMBI, Leopold-Franzens-University Innsbruck, 6020 Innsbruck, Austria.

Cells
|November 27, 2021
PubMed
Summary

Defective autophagy impairs the clearance of alpha-synuclein, leading to its aggregation in neurodegenerative diseases like Parkinson's disease. This review explores the role of impaired autophagy in alpha-synucleinopathies.

Keywords:
Parkinson’s diseasealpha-synucleinautophagymultiple system atrophyneuronsoligodendroglia

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Pathology

Background:

  • Alpha-synucleinopathies, including Parkinson's disease (PD), dementia with Lewy bodies (DLB), and multiple system atrophy (MSA), share a common hallmark: alpha-synuclein deposits.
  • These deposits manifest as Lewy bodies (LBs) in neurons (PD, DLB) or glial cytoplasmic inclusions (GCIs) in oligodendroglia (MSA).
  • The precise mechanisms driving intracytoplasmic inclusion formation remain unclear, with impaired autophagy emerging as a potential key factor.

Purpose of the Study:

  • To review the involvement of defective autophagy in the pathogenesis of alpha-synucleinopathies.
  • To discuss how impaired autophagy contributes to alpha-synuclein aggregation and propagation.
  • To explore the link between autophagy dysfunction and neurodegeneration in these diseases.

Main Methods:

  • Literature review of studies investigating autophagy markers and alpha-synuclein aggregation in PD, DLB, and MSA.
  • Analysis of existing research on the interplay between autophagic machinery and alpha-synuclein.
  • Synthesis of evidence regarding the role of autophagy dysfunction in neurodegenerative processes.

Main Results:

  • Reduced autophagy is implicated in the aggregation of alpha-synuclein.
  • Altered levels of autophagy markers are observed in the brains of patients with PD, DLB, and MSA.
  • The exact causal relationship between autophagy dysfunction and alpha-synuclein pathology is still under investigation.

Conclusions:

  • Defective autophagy machinery plays a significant role in the formation and propagation of alpha-synuclein aggregates.
  • Autophagy dysfunction is a critical component of the neurodegenerative cascade in alpha-synucleinopathies.
  • Further research is needed to elucidate whether autophagy dysfunction initiates or exacerbates alpha-synuclein pathology.