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Complex I Controls Mitochondrial and Plasma Membrane Potentials in Nerve Terminals.

Seán M Kilbride1, Jayne E Telford1, Gavin P Davey2

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Neurochemical Research
|March 5, 2020
PubMed
Summary

Mitochondrial electron transport chain (ETC) complex I is highly sensitive to inhibition, impacting mitochondrial membrane potential (Δψm) and plasma membrane potential (Δψp). This sensitivity may explain neuronal cell death in neurodegenerative diseases like Parkinson's.

Keywords:
Complex IEnergy thresholdsMembrane potentialsMitochondriaNerve terminalNeurodegeneration

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Area of Science:

  • Neuroscience
  • Cellular Biology
  • Biochemistry

Background:

  • Mitochondrial electron transport chain (ETC) enzyme dysfunction is linked to neurodegenerative diseases.
  • Mitochondrial membrane potential (Δψm) is crucial for ATP production and neuronal survival.

Purpose of the Study:

  • To investigate the impact of inhibiting different ETC complexes on Δψm and plasma membrane potential (Δψp) in synaptosomes.
  • To determine the sensitivity thresholds of ETC complexes I, II/III, III, and IV to inhibition.

Main Methods:

  • Titration of specific inhibitors (rotenone, antimycin A, myxothiazol, KCN) for ETC complexes I, II/III, III, and IV.
  • Measurement of Δψm and Δψp in synaptosomal mitochondria.

Main Results:

  • Low concentrations of rotenone (complex I inhibitor) caused immediate Δψm depolarization.
  • Significant inhibition (>70% for complex II/III, >90% for complex III and IV) was required to affect Δψm.
  • Δψp was more sensitive to complex I inhibition (40% threshold) than to complexes III and IV (>90% inhibition).

Conclusions:

  • Synaptosomal Δψm and Δψp are more susceptible to complex I activity reduction than other ETC complexes.
  • These findings may elucidate the role of reduced complex I activity in neuronal cell death, particularly in Parkinson's disease.