Related Experiment Video

Updated: Aug 25, 2026

Measurement of Oxygen Consumption Rate in Acute Striatal Slices from Adult Mice
07:41

Measurement of Oxygen Consumption Rate in Acute Striatal Slices from Adult Mice

Published on: June 8, 2022

Initiation of neuronal damage by complex I deficiency and oxidative stress in Parkinson's disease

Laszlo Tretter1, Ildiko Sipos, Vera Adam-Vizi

  • 1Department of Medical Biochemistry, Semmelweis University, Budapest, Hungary.

Neurochemical Research
|March 25, 2004
PubMed

Insights

Parkinson's disease involves oxidative stress and mitochondrial complex I deficiencies. This creates a harmful cycle of reactive oxygen species (ROS) production, damaging neurons and leading to cell death.

Area of Science:

  • Neuroscience
  • Biochemistry
  • Cell Biology

Background:

  • Oxidative stress and mitochondrial complex I dysfunction are implicated in Parkinson's disease pathogenesis.
  • A feedback loop exists where complex I inhibition increases reactive oxygen species (ROS), which further inhibits complex I.

Purpose of the Study:

  • To elucidate the interconnected roles of oxidative stress and mitochondrial complex I in Parkinson's disease.
  • To explain the mechanism by which ROS and complex I inhibition contribute to dopaminergic neuron degeneration.

Main Methods:

  • The study focuses on the biochemical and cellular mechanisms underlying complex I inhibition and ROS production.
  • It examines the impact of partial complex I inhibition on mitochondria in nerve terminals.
  • The role of hydrogen peroxide (H2O2) in inhibiting key enzymes is investigated.

Main Results:

  • Partial complex I inhibition in nerve terminals leads to increased ROS generation by mitochondria.
  • Hydrogen peroxide (H2O2) significantly inhibits both complex I and alpha-ketoglutarate dehydrogenase.
  • A vicious cycle of oxidative damage and energy deficit is established in dopaminergic neurons.

Conclusions:

  • The interplay between mitochondrial complex I deficiency and oxidative stress is a critical driver of Parkinson's disease.
  • This cycle results in excessive oxidative stress, ATP deficit, and eventual cell death in the nigro-striatal pathway.
  • Targeting this vicious cycle may offer therapeutic strategies for Parkinson's disease.

More Related Videos

Histological Examination of Mitochondrial Morphology in a Parkinson's Disease Model06:07

Histological Examination of Mitochondrial Morphology in a Parkinson's Disease Model

Published on: June 23, 2023

Related Concept Videos

Parkinson Disease ll: Pathophysiology01:24

Parkinson Disease ll: Pathophysiology

Parkinson disease (PD) is a progressive neurodegenerative disorder primarily affecting movement, with additional non-motor features. Its pathophysiology involves complex interactions among genetic susceptibility, environmental exposures, and cellular dysfunction, including dopaminergic neuron loss, protein aggregation, and mitochondrial impairment.Selective NeurodegenerationA key feature is the degeneration of dopaminergic neurons in the substantia nigra pars compacta, leading to reduced...
Parkinson Disease l: Introduction01:24

Parkinson Disease l: Introduction

Parkinson’s disease is a chronic, progressive neurodegenerative disorder that primarily affects movement. It is characterized by motor symptoms such as resting tremors, muscle rigidity, bradykinesia (slowness of movement), and postural instability. Patients may notice hand tremors at rest, stiffness during movement, or a shuffling gait. In addition to motor features, non-motor symptoms include sleep disturbances, mood and behavioral changes, constipation, and cognitive impairment, all of which...
Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
Parkinson's Disease: Overview01:15

Parkinson's Disease: Overview

Neurodegenerative disorders are progressive diseases that cause irreversible damage and loss to neurons in specific brain areas. Examples of these disorders include Parkinson's disease, Alzheimer's disease, Multiple Sclerosis (MS), and Amyotrophic Lateral Sclerosis (ALS). These disorders share characteristics such as proteinopathies, selective neuronal vulnerability, and a complex interplay between genetic and environmental factors. The primary therapeutic goal for these conditions is to...
Electron Transport Chain: Complex III and IV01:43

Electron Transport Chain: Complex III and IV

During the electron transport chain, electrons from NADH and FADH2 are first transferred to complexes I and II, respectively. These two complexes then transfer the electrons to ubiquinol, which carries them further to complex III. Complex III passes the electrons across the intermembrane space to Cyt c, which carries them further to complex IV. Complex IV donates electrons to oxygen and reduces it to water. As electrons pass through complexes I, III, and IV, the energy released aids the pumping...
The Electron Transport Chain01:30

The Electron Transport Chain

The electron transport chain or oxidative phosphorylation is an exothermic process in which free energy released during electron transfer reactions is coupled to ATP synthesis. This process is a significant source of energy in aerobic cells, and therefore inhibitors of the electron transport chain can be detrimental to the cell's metabolic processes.
Inhibitors of the electron transport chain
Rotenone, a widely used pesticide, prevents electron transfer from Fe-S cluster to ubiquinone or Q in...