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Updated: May 15, 2026

Evaluation of LC3-II Release via Extracellular Vesicles in Relation to the Accumulation of Intracellular LC3-positive Vesicles
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Evaluation of LC3-II Release via Extracellular Vesicles in Relation to the Accumulation of Intracellular LC3-positive Vesicles

Published on: October 18, 2024

Macroautophagy abnormality in essential tremor

Sheng-Han Kuo1, Guomei Tang, Karen Ma

  • 1Department of Neurology, College of Physicians and Surgeons, Columbia University, New York, New York, United States of America.

Plos One
|January 10, 2013
PubMed

Insights

Essential tremor (ET) shows impaired macroautophagy, a cellular cleanup process. Reduced levels of key proteins like LC3-II and beclin-1 in ET brains suggest autophagic failure contributes to Purkinje cell pathology.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • Macroautophagy is a critical cellular process for removing damaged components.
  • Dysfunctional macroautophagy is implicated in various neurodegenerative diseases.
  • Essential tremor (ET) is a common neurological disorder with unclear pathogenesis.

Purpose of the Study:

  • To investigate the macroautophagy pathway in the cerebellum of essential tremor (ET) cases.
  • To compare the levels of key macroautophagy-related proteins and mitochondrial markers in ET versus controls.
  • To explore the correlation between macroautophagy markers and disease duration in ET.

Main Methods:

  • Western blot analysis of LC3-II, S6K, p-S6K, beclin-1, and mitochondrial proteins in post-mortem cerebellar tissue.
  • Immunohistochemistry to quantify LC3 clustering in Purkinje cells (PCs).
  • Analysis of 10 ET cases and 11 controls for Western blot, and 12 ET cases and 13 controls for immunohistochemistry.

Main Results:

  • Significantly lower LC3-II protein levels and LC3 clustering in PCs of ET cases compared to controls.
  • Beclin-1 levels were markedly reduced in ET cerebellum.
  • Accumulation of mitochondrial membrane proteins (TIM23, TOMM20) observed in ET cases.
  • Inverse correlation between disease duration and LC3-II protein levels in ET.

Conclusions:

  • Essential tremor exhibits impaired macroautophagy in the cerebellum.
  • Reduced beclin-1 levels may underlie the observed autophagic failure in ET.
  • Perturbed macroautophagy and subsequent mitochondrial accumulation could contribute to Purkinje cell pathology in ET.

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