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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...
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...
Neural Regulation01:37

Neural 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.
Alterations in Muscle Tone lll01:11

Alterations in Muscle Tone lll

Rigidity and myotonia are distinct abnormalities of muscle tone that affect resistance and relaxation during movement. Although both involve altered muscle contraction, they arise from different neurological and muscular mechanisms.CharacteristicsRigidity is characterized by uniform resistance to passive movement across the entire range, independent of speed, affecting flexors and extensors equally. It may appear as lead-pipe rigidity (smooth, constant resistance) or cogwheel rigidity...
Parkinson's Disease: Treatment01:24

Parkinson'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...

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Related Experiment Video

Updated: May 20, 2026

Gene-environment Interaction Models to Unmask Susceptibility Mechanisms in Parkinson's Disease
08:09

Gene-environment Interaction Models to Unmask Susceptibility Mechanisms in Parkinson's Disease

Published on: January 7, 2014

Physiological phenotype and vulnerability in Parkinson's disease.

D James Surmeier1, Jaime N Guzman, Javier Sanchez

  • 1Department of Physiology, Northwestern University, Chicago, Illinois, USA. j-surmeier@northwestern.edu

Cold Spring Harbor Perspectives in Medicine
|July 5, 2012
PubMed
Summary

Neuronal excitability creates an energetic burden on mitochondria, increasing oxidative stress and vulnerability in Parkinson's disease (PD) and aging. Targeting L-type calcium channels may offer a neuroprotective strategy against this mitochondrial dysfunction.

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Phenotypic Profiling of Human Stem Cell-Derived Midbrain Dopaminergic Neurons
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Last Updated: May 20, 2026

Gene-environment Interaction Models to Unmask Susceptibility Mechanisms in Parkinson's Disease
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Gene-environment Interaction Models to Unmask Susceptibility Mechanisms in Parkinson's Disease

Published on: January 7, 2014

Phenotypic Profiling of Human Stem Cell-Derived Midbrain Dopaminergic Neurons
09:21

Phenotypic Profiling of Human Stem Cell-Derived Midbrain Dopaminergic Neurons

Published on: July 7, 2023

Area of Science:

  • Neuroscience
  • Cellular Physiology
  • Mitochondrial Biology

Background:

  • Neuronal vulnerability in Parkinson's disease (PD) and aging is linked to physiological phenotypes governing action potential generation.
  • Maintaining ionic gradients for neuronal excitability imposes a significant energetic demand, especially on neurons with specific electrophysiological characteristics.
  • Mitochondria, crucial for cellular respiration, bear this energetic burden, leading to increased reactive oxygen species (ROS) production.

Purpose of the Study:

  • To explore the hypothesis that neuronal physiological phenotype contributes to vulnerability in Parkinson's disease (PD) and aging.
  • To elucidate the role of mitochondrial energetic burden and ROS production in PD pathogenesis.
  • To identify potential neuroprotective strategies based on cellular physiology.

Main Methods:

  • Review of existing literature on neuronal excitability, mitochondrial function, and Parkinson's disease.
  • Analysis of the energetic costs associated with specific neuronal phenotypes.
  • Examination of the link between mitochondrial dysfunction, ROS, and PD-related genetic mutations/toxins.

Main Results:

  • Neurons with sustained depolarization, broad action potentials, significant calcium influx, and poor buffering capacity face a higher energetic burden.
  • This burden increases mitochondrial ROS production, a key factor in cellular aging and PD.
  • PD-associated factors often compromise mitochondrial function, creating a mechanistic link to observed pathology.

Conclusions:

  • Neuronal phenotype significantly influences mitochondrial energetics and susceptibility to oxidative stress in PD and aging.
  • Targeting L-type voltage-dependent calcium channels, for which antagonists are available, presents a feasible neuroprotective strategy.
  • Reducing mitochondrial burden via modulation of calcium entry could mitigate PD-related neurodegeneration.