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Related Concept Videos

Parkinson Disease l: Introduction01:24

Parkinson Disease l: Introduction

28
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...
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Parkinson's Disease: Overview01:15

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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...
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Parkinson's Disease: Treatment01:24

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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...
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Parkinson Disease ll: Pathophysiology01:24

Parkinson Disease ll: Pathophysiology

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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...
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Alterations in Muscle Tone lll01:11

Alterations in Muscle Tone lll

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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...
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Neural Regulation01:37

Neural Regulation

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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.
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Gene-environment Interaction Models to Unmask Susceptibility Mechanisms in Parkinson's Disease
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Premotor parkinsonism models.

Erwan Bezard1, Pierre-Olivier Fernagut

  • 1Université de Bordeaux, Institut des Maladies Neurodégénératives, UMR 5293, F-33000 Bordeaux, France; CNRS, Institut des Maladies Neurodégénératives, UMR 5293, F-33000 Bordeaux, France.

Parkinsonism & Related Disorders
|November 23, 2013
PubMed
Summary
This summary is machine-generated.

Parkinson's disease research models effectively replicate key non-motor symptoms like olfactory dysfunction, REM sleep behavior disorder (RBD), and constipation. These models aid in understanding early Parkinson's disease mechanisms and progression.

Keywords:
ConstipationNon-human primateOlfactory dysfunctionREM sleep behaviour disorderRodent models

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Area of Science:

  • Neuroscience
  • Pathology
  • Animal Models

Background:

  • Parkinson's disease (PD) presents with non-motor symptoms preceding motor deficits.
  • Olfactory dysfunction, REM sleep behavior disorder (RBD), and constipation are significant premotor symptoms.
  • Investigating these symptoms in preclinical models is crucial for understanding early PD pathogenesis.

Purpose of the Study:

  • To review premotor symptoms of Parkinson's disease.
  • To evaluate the recapitulation of these symptoms in toxin- and gene-based animal models.
  • To discuss the relevance of these models for understanding early PD mechanisms.

Main Methods:

  • Review of existing literature on PD models.
  • Analysis of studies investigating olfactory, sleep, and gastrointestinal symptoms in toxin- and gene-based models.
  • Comparison of findings across different model systems.

Main Results:

  • Altered olfactory discrimination is reproducible in both toxin- and gene-based models.
  • Sleep alterations and RBD-like features are observed, particularly in toxin-based models and non-human primates.
  • Gastrointestinal dysfunction, including reduced colonic motility and enteric α-synuclein accumulation, is replicated in both model types.

Conclusions:

  • Toxin- and gene-based models effectively recapitulate key premotor symptoms of Parkinson's disease.
  • These models offer valuable insights into the pathophysiological mechanisms underlying early PD.
  • Further research using these models can elucidate disease progression and inform therapeutic strategies.