Related Experiment Video
Updated: Jun 23, 2026
15:09
The Use of Primary Human Fibroblasts for Monitoring Mitochondrial Phenotypes in the Field of Parkinson's Disease
Published on: October 3, 2012
Modeling proteasome dynamics in Parkinson's disease.
Kim Sneppen1, Ludvig Lizana, Mogens H Jensen
1Niels Bohr Institute, Copenhagen, Denmark. sneppen@nbi.dk
Physical Biology
|May 5, 2009
Summary
Parkinson's disease involves alpha-synuclein (alphaSN) aggregation overwhelming the cell's protein cleanup system. A model shows reduced proteasome function leads to oscillations and disease onset.
Area of Science:
- Neuroscience
- Cell Biology
- Biophysics
Background:
- Parkinson's disease (PD) is linked to alpha-synuclein (alphaSN) aggregation.
- Protein quality control systems, like the ubiquitin-proteasome system, are implicated in PD pathogenesis.
- Dysfunctional proteasomes may contribute to the accumulation of toxic protein aggregates.
Purpose of the Study:
- To model the dynamic interplay between alpha-synuclein aggregation and proteasome function.
- To investigate the conditions leading to proteasome collapse and cellular homeostasis disruption.
- To explore the role of proteasome overburdening in the onset of Parkinson's disease.
Main Methods:
- Development of a simple dynamical model.
- Mathematical analysis of the model's behavior under varying conditions.
- Simulation of proteasome concentration dynamics in response to alphaSN aggregation.
Main Results:
- Proteasome activity can be titrated by alpha-synuclein fibrils and protofilaments.
- A critical threshold in the proteasome-to-alphaSN ratio predicts homeostasis collapse.
- Reduced proteasome availability leads to oscillations in proteasome concentration and oligomer accumulation.
- The model suggests proteasome overburdening is a general mechanism in protein aggregation diseases.
Conclusions:
- The onset of Parkinson's disease may be associated with proteasomes periodically degrading aggregates.
- Proteasome dysfunction and oscillations are key indicators of cellular stress in PD.
- This model provides a framework for understanding other diseases involving protein aggregation and proteostasis failure.
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...
01:15Parkinson'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 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...
01:13The Proteasome
Eukaryotic cells can degrade proteins through several pathways. One of the most important among these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3 (ubiquitin...
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3 (ubiquitin...
02:18The Proteasome
Eukaryotic cells can degrade proteins through several pathways. One of the most important amongst these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
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...