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In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased...
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Author Spotlight: Establishing a New Fluorescence-Based Protocol for In Vivo Mitochondrial Morphology Analysis in Parkinson's Disease
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Alpha-synuclein-induced mitochondrial dysfunction is mediated via a sirtuin 3-dependent pathway.

Jae-Hyeon Park1, Jeremy D Burgess1,2, Ayman H Faroqi1

  • 1Department of Neuroscience, Mayo Clinic, 4500 San Pablo Road, Jacksonville, FL, 32224, USA.

Molecular Neurodegeneration
|January 15, 2020
PubMed
Summary

Alpha-synuclein (αsyn) aggregation in Parkinson's disease (PD) reduces mitochondrial sirtuin 3 (SIRT3) levels, impairing mitochondrial function. Increasing SIRT3 can restore mitochondrial health and reduce αsyn pathology.

Keywords:
Mitochondria dysfunctionParkinson’s diseaseSirtuin 3α-Synuclein

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Area of Science:

  • Neuroscience
  • Mitochondrial Biology
  • Biochemistry

Background:

  • Alpha-synuclein (αsyn) misfolding and aggregation are key features of Parkinson's disease (PD).
  • Mitochondrial dysfunction, including impaired dynamics and biogenesis, is central to PD pathogenesis.
  • Sirtuin 3 (SIRT3), a mitochondrial NAD+-dependent enzyme, is crucial for mitochondrial function and is downregulated in aging and neurodegenerative diseases.

Purpose of the Study:

  • To investigate the association between alpha-synuclein (αsyn) and mitochondrial sirtuin 3 (SIRT3) levels in Parkinson's disease.
  • To elucidate the role of SIRT3 in αsyn-induced mitochondrial dysfunction.
  • To explore therapeutic strategies targeting SIRT3 for PD.

Main Methods:

  • Assessed mitochondrial SIRT3 levels in cells expressing oligomeric αsyn.
  • Examined mitochondrial integrity, dynamics, respiration, and stress response markers.
  • Validated findings in a rodent PD model and human post-mortem Lewy body disease (LBD) brain tissue.

Main Results:

  • αsyn associates with mitochondria, decreasing SIRT3 levels, mitochondrial biogenesis, and oxygen consumption rate (OCR).
  • SIRT3 downregulation correlated with impaired mitochondrial dynamics (altered AMPK, CREB, DRP1 phosphorylation).
  • Treatment with an AMPK agonist (AICAR) restored SIRT3, improved mitochondrial function, and reduced αsyn oligomers in a SIRT3-dependent manner.

Conclusions:

  • Decreased SIRT3 levels contribute to αsyn-induced mitochondrial dysfunction in PD.
  • Pharmacological enhancement of SIRT3 can counteract mitochondrial deficits and reduce αsyn pathology.
  • SIRT3 plays a protective role in PD-associated pathways, offering a potential therapeutic target.