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Neurochemical Transmission: Sites of Drug Action01:26

Neurochemical Transmission: Sites of Drug Action

Neurochemical transmission, the conduction of electrical impulses between neurons mediated by neurotransmitters, plays a vital role in various physiological processes. Autonomic drugs exert their effects by modulating neurotransmission within the autonomic nervous system. For instance, drugs such as hemicholinium block the precursor uptake necessary for synthesizing acetylcholine, an essential autonomic neurotransmitter. Following synthesis, neurotransmitters are stored in vesicles. Metyrosine...
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Ganglionic stimulants activate NM nicotinic receptors in autonomic ganglia, falling into two categories: nicotine mimetics [e.g., lobeline, dimethylpiperazine, tetramethylammonium] and muscarinic receptor agonists [e.g., muscarine, methacholine]. The first category's action is rapid and blocked by nicotinic receptor antagonists, while the second category's action is delayed and blocked by atropine-like agents. Nicotine, an alkaloid, affects the heart rate by stimulating sympathetic or...
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Certain drugs can affect how neurotransmitters called catecholamines, are released or taken back up in the adrenergic neuron. They can have different effects on the body's sympathetic transmission. Reserpine, a natural compound found in the Rauwolfia shrub, blocks a transporter called vesicular monoamine transporter (VMAT), which leads to a buildup of catecholamines in the cell and reduces sympathetic transmission. Another drug called guanethidine works in multiple ways, including blocking...
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Live Imaging of Nicotine Induced Calcium Signaling and Neurotransmitter Release Along Ventral Hippocampal Axons
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Published on: June 24, 2015

Nicotine regulates multiple synaptic proteins by inhibiting proteasomal activity.

Khosrow Rezvani1, Yanfen Teng, David Shim

  • 1Department of Neuroscience, Baylor College of Medicine, Houston, Texas 77030, USA.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|September 28, 2007
PubMed
Summary

Nicotine exposure reduces proteasome activity, leading to protein buildup and altered synaptic protein levels. This suggests the ubiquitin-proteasome system (UPS) plays a role in nicotine-induced synaptic plasticity.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Biochemistry

Background:

  • The ubiquitin-proteasome system (UPS) is crucial for protein regulation, impacting synaptic transmission and plasticity.
  • Nicotine affects synaptic function through incompletely understood mechanisms.

Purpose of the Study:

  • To investigate the impact of nicotine on the UPS at mammalian synapses.
  • To explore the role of the UPS in nicotine-dependent synaptic plasticity.

Main Methods:

  • Assessing proteasomal activity and ubiquitinated protein levels after nicotine exposure.
  • Quantifying levels of key synaptic proteins (nAChR, AMPA, NMDA, Homer-1A, PSD-95, Shank) via Western blotting.
  • Investigating the interaction between nicotine and the 20S proteasome using competition binding assays.

Main Results:

  • Nicotine reduced proteasomal activity and increased ubiquitinated synaptic proteins.
  • Nicotine exposure altered levels of synaptic receptors and plasticity-related proteins, including decreased degradation of the alpha7 nicotinic acetylcholine receptor (nAChR) subunit.
  • Nicotine directly interacted with the 20S proteasome, and nAChR antagonism only partially blocked its effects on proteasomal activity.

Conclusions:

  • Nicotine inhibits proteasomal activity, leading to altered synaptic protein homeostasis.
  • The UPS is implicated in mediating nicotine's effects on synaptic plasticity.
  • Nicotine may directly interact with the proteasome, suggesting a novel mechanism of action beyond nAChR activation.