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Related Concept Videos

Neuromuscular Junction And Blockade01:29

Neuromuscular Junction And Blockade

The site of chemical communication between a motor neuron and a muscle fiber is called the neuromuscular junction (NMJ). The end of the motor neuron at the NMJ divides into a cluster of synaptic end bulbs. The cytoplasm of these bulbs consists of synaptic vesicles enclosing acetylcholine molecules, the principal neurotransmitter released at the NMJ. The region opposite the synaptic bulb that ends in the muscle fiber is called the motor end plate, which has acetylcholine receptors. Within the...
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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.
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Indirect-acting cholinergic agonists, also known as anticholinesterases, exert their pharmacological effects by enhancing cholinergic transmission in various body parts, including the neuromuscular junction, autonomic cholinergic synapses, and the brain.
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Indirect-Acting Cholinergic Agonists: Mechanism of Action01:18

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Levator Auris Longus Preparation for Examination of Mammalian Neuromuscular Transmission Under Voltage Clamp Conditions
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Interaction of glutamate- and adenosine-induced decrease of acetylcholine quantal release at frog neuromuscular

S Adámek1, A V Shakirzyanova, A I Malomouzh

  • 1Third Surgical Department, First Faculty of Medicine, Charles University, Prague, Czech Republic.

Physiological Research
|December 15, 2010
PubMed
Summary

Glutamate inhibits frog neuromuscular junctions by activating metabotropic glutamate receptors. This inhibition involves nitric oxide (NO) for evoked potentials but not spontaneous ones, and is modulated by adenosine receptors.

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Area of Science:

  • Neuroscience
  • Pharmacology
  • Muscle Physiology

Background:

  • Glutamate is a key neurotransmitter in the central nervous system.
  • Its role at the neuromuscular junction is less understood.
  • Metabotropic glutamate receptors (mGluRs) are G-protein coupled receptors involved in modulating neuronal activity.

Purpose of the Study:

  • To investigate the effects of glutamate on frog neuromuscular preparations.
  • To elucidate the mechanisms underlying glutamate's action, including the involvement of nitric oxide (NO) and adenosine receptors.

Main Methods:

  • Used frog m. sartorius neuromuscular preparations.
  • Administered glutamate, MCPG (mGluR inhibitor), L-NAME (NO synthase inhibitor), and ODQ (guanylyl cyclase inhibitor).
  • Measured spontaneous miniature endplate potentials (MEPPs) and nerve stimulation-evoked endplate potentials (EPPs).

Main Results:

  • Glutamate reversibly inhibited both MEPPs and EPPs in a dose-dependent manner.
  • This effect was mediated by group I metabotropic glutamate receptors.
  • Nitric oxide (NO) pathway inhibition (L-NAME, ODQ) blocked glutamate's depression of evoked EPPs, but not MEPPs.
  • Adenosine receptors partially prevented glutamate's effect on evoked EPPs.
  • No interaction was observed with carbacholine or ATP inhibitory pathways.

Conclusions:

  • Glutamate modulates frog neuromuscular transmission via mGluRs.
  • A NO-dependent cascade, modulated by adenosine receptors, mediates glutamate's inhibition of evoked EPPs.
  • This NO cascade does not appear to be involved in the glutamate-induced depression of spontaneous MEPP frequency.