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Related Concept Videos

Myasthenia Gravis ll: Pathophysiology01:22

Myasthenia Gravis ll: Pathophysiology

The disease process of myasthenia gravis begins at the neuromuscular junction, where antibodies attack key proteins needed for muscle activation. This immune reaction weakens signal transmission, leading to the characteristic muscle fatigue and weakness that define the condition.Immune-Mediated DamageIn most individuals, antibodies target acetylcholine receptors (AChRs) on the postsynaptic membrane of muscle cells. By blocking acetylcholine binding, these antibodies prevent the nerve signal...
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Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
Chemical Synapses01:26

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Myasthenia Gravis: Overview and Treatment01:20

Myasthenia Gravis: Overview and Treatment

Myasthenia gravis is a neuromuscular transmission disorder characterized by weakness and increased fatigability of skeletal muscles. It is an autoimmune disease affecting approximately one in 2000 people, where antibodies against the α1 subunit of nicotinic acetylcholine receptors are produced.
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Myasthenia gravis is an autoimmune condition affecting neuromuscular transmission, causing generalized weakness in skeletal muscles. Initial diagnoses rely on patients' signs, symptoms, and medical history. The challenge lies in distinguishing myasthenia from other muscular dystrophies. An important diagnostic feature is the significant improvement of symptoms after administering anticholinesterase inhibitors.
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Parkinson Disease ll: Pathophysiology01:24

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Related Experiment Video

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In Vivo Electrophysiological Measurement of Compound Muscle Action Potential from the Forelimbs in Mouse Models of Motor Neuron Degeneration
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Published on: June 15, 2018

Metals in motor neuron diseases.

Per M Roos1, Olof Vesterberg, Monica Nordberg

  • 1Institute of Environmental Medicine, Karolinska Institutet, SE-171 77, Stockholm, Sweden.

Experimental Biology and Medicine (Maywood, N.J.)
|October 5, 2006
PubMed
Summary

This review explores the role of metals in amyotrophic lateral sclerosis (ALS), a neurodegenerative disease. Altered metal kinetics may contribute to motor neuron degeneration, impacting motor function and leading to disease progression.

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Area of Science:

  • Neuroscience
  • Toxicology
  • Neurology

Background:

  • Neurodegenerative diseases like amyotrophic lateral sclerosis (ALS) involve progressive nervous system deterioration.
  • The exact cause of ALS remains unknown, though various factors have been proposed.
  • Metal exposure has been suggested as a potential contributing factor to ALS etiology.

Purpose of the Study:

  • To review the role of metals in motor neuron disease, specifically ALS.
  • To integrate findings from classic exposure studies with current knowledge of metal-binding proteins.
  • To understand metal dynamics in ALS by examining exposure, excretion, and binding.

Main Methods:

  • Literature review of studies on metal exposure and kinetics in ALS.
  • Analysis of chemical and electrophysiological investigations related to neurodegeneration.
  • Consideration of metal-binding proteins and their role in motor neuron function.

Main Results:

  • While lead or mercury exposure has been suggested, exposure data alone is insufficient to confirm a link.
  • Alterations in metal kinetics are hypothesized to underlie motor function decline in ALS patients.
  • Metal dynamics, including peak exposure and excretion, are crucial for understanding ALS.

Conclusions:

  • Metals may play a significant role in the pathogenesis of ALS.
  • Further research into metal kinetics and binding proteins is warranted for ALS.
  • Understanding metal dynamics could provide insights into neurodegeneration in ALS.