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Autophagy01:27

Autophagy

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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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Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
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Mitophagy in Huntington's disease.

I Šonský1, P Vodička2, K Vodičková Kepková2

  • 1Laboratory for Study of Mitochondrial Disorders, Department of Pediatrics and Inherited Metabolic Disorders, First Faculty of Medicine, Charles University and General University Hospital in Prague, Czech Republic.

Neurochemistry International
|July 30, 2021
PubMed
Summary

Huntington's disease involves neuronal loss and protein aggregates. Mitophagy, the clearance of damaged mitochondria, is crucial for neuronal health and may offer therapeutic strategies for neurodegenerative diseases.

Keywords:
Huntington's diseaseMitochondriaMitophagyMitophagy adaptorsPharmacological induction of mitophagy

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Genetics

Background:

  • Neurodegenerative diseases like Huntington's disease (HD), Parkinson's, and Alzheimer's share features of neuronal loss and protein aggregate accumulation.
  • Autophagy, a cellular quality control process, is vital for clearing protein aggregates and maintaining neuronal homeostasis.
  • Mitochondria are critical for neuronal energy supply, and their inefficient removal contributes to neurodegeneration, particularly in HD.

Purpose of the Study:

  • To review the role of mitophagy, a selective form of autophagy, in clearing damaged mitochondria.
  • To explore the connection between huntingtin protein and the autophagic machinery in HD.
  • To discuss the therapeutic potential of regulating mitophagy for neurodegenerative diseases.

Main Methods:

  • Literature review focusing on mitophagy and neurodegeneration.
  • Analysis of the role of huntingtin protein in autophagy.
  • Examination of pharmacological interventions targeting mitophagy.

Main Results:

  • Mitophagy is essential for removing damaged mitochondria, a process implicated in HD pathogenesis.
  • The huntingtin protein directly interacts with the autophagic pathway.
  • Pharmacological modulation of mitophagy presents a promising therapeutic avenue.

Conclusions:

  • Dysfunctional mitophagy contributes to neurodegeneration, especially in Huntington's disease.
  • Targeting mitophagy offers a potential therapeutic strategy for neurodegenerative disorders.
  • Further research into mitophagy regulation could lead to novel treatments for HD.