Related Experiment Video
Updated: Jul 9, 2026
06:07
Histological Examination of Mitochondrial Morphology in a Parkinson's Disease Model
Published on: June 23, 2023
Complex I deficiency in Parkinson's disease frontal cortex
W Davis Parker1, Janice K Parks, Russell H Swerdlow
1Department of Neurology, University of Virginia School of Medicine, Charlottesville, Virginia 22908, USA. dp8m@virginia.edu
Brain Research
|December 7, 2007
Summary
Parkinson's disease (PD) involves complex I deficiency beyond the substantia nigra. Methodological factors are crucial for detecting this mitochondrial dysfunction in PD frontal cortex.
Area of Science:
- Neuroscience
- Biochemistry
- Mitochondrial Biology
Background:
- Parkinson's disease (PD) is often associated with complex I (NADH:ubiquinone oxidoreductase) deficiency.
- Previous studies localized this complex I loss primarily to the substantia nigra in PD brains.
Purpose of the Study:
- To investigate the paradox of complex I activity loss in Parkinson's disease (PD) brain.
- To determine if complex I deficiency extends beyond the substantia nigra in PD.
Main Methods:
- Assessed activity of mitochondrial electron transport chain complexes (I-IV) in frontal cortex from PD and aged control brains.
- Utilized various assay conditions and tissue preparations, including purified mitochondria.
- Evaluated the effect of bovine serum albumin on enzyme activity and discrimination.
Main Results:
- Demonstrated increasingly significant losses of complex I activity in PD frontal cortex with increasing mitochondrial purity.
- Found no significant differences in activities of complexes II, III, and IV between PD and control frontal cortex.
- Observed that bovine serum albumin enhanced activity but reduced discrimination between PD and controls.
Conclusions:
- Complex I deficiency in Parkinson's disease (PD) brain is not restricted to the substantia nigra.
- Methodological considerations, particularly tissue preparation and assay conditions, are critical for accurately demonstrating complex I loss in PD.
Related Concept Videos
01:24Parkinson 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...
01:24Parkinson 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...
01:15Parkinson'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...
01:24Parkinson's Disease: Treatment
Neurodegenerative disorders, such as Parkinson's Disease (PD), involve the gradual and irreversible destruction of neurons in particular brain areas. These disorders exhibit standard features like proteinopathies, selective vulnerability of some neurons, and an interaction of intrinsic properties, genetics, and environmental influences in neural injury.
Parkinson's Disease is primarily a result of the loss of dopaminergic neurons in the substantia nigra pars compacta. The cornerstone of its...
Parkinson's Disease is primarily a result of the loss of dopaminergic neurons in the substantia nigra pars compacta. The cornerstone of its...
01:37Neural Regulation
Digestion begins with a cephalic phase that prepares the digestive system to receive food. When our brain processes visual or olfactory information about food, it triggers impulses in the cranial nerves innervating the salivary glands and stomach to prepare for food.
01:23Alzheimer Disease ll: Pathophysiology
Alzheimer disease involves structural changes in the brain that begin long before symptoms appear. The most distinctive features are extracellular neuritic plaques and intracellular neurofibrillary tangles.Neuritic plaques form in the cerebral cortex and around blood vessels. These plaques contain a dense core of beta-amyloid (Aβ)—a toxic protein fragment that clumps outside neurons. The core is surrounded by damaged neuronal extensions, as well as reactive astrocytes and microglia. Abnormal...