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Related Concept Videos

CNS Depressants: Alcohol and Nicotine01:27

CNS Depressants: Alcohol and Nicotine

Ethanol, a clear colorless alcohol, has been consumed by humans for millennia, but its effects on the body are far from benign. At lower doses, it induces decreased inhibitions and loquaciousness, leading to its social appeal. However, it can cause severe consequences at higher doses, such as coma and respiratory depression, due to its zero-order elimination kinetics. Chronic ethanol abuse wreaks havoc on multiple organ systems, particularly the CNS and the liver. Abrupt cessation of ethanol...
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When an action potential reaches the presynaptic axon terminal, it releases neurotransmitters from the neuron into the synaptic cleft at a chemical synapse. The released neurotransmitter can be excitatory or inhibitory. The critical criteria commonly used to determine whether a molecule is a neurotransmitter at a chemical synapse are the molecule's presence in the presynaptic neuron. Second, its release is in response to strong presynaptic depolarization. And lastly, the presence of specific...
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Synaptic integration mainly includes the summation of graded potentials. Graded potentials, regardless of their type, cause subtle alterations in membrane voltage, resulting in either depolarization or hyperpolarization. These incremental changes, when combined or summed, can propel the neuron toward its threshold. Consider, for example, a membrane experiencing a +15 mV shift, causing it to depolarize from -70 mV to -55 mV. In this scenario, graded potentials govern the membrane's ability to...
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Updated: Jun 17, 2026

Chronic Intermittent Ethanol Vapor Exposure Paired with Two-Bottle Choice to Model Alcohol Use Disorder
05:12

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Published on: June 23, 2023

Presynaptic targets for acute ethanol sensitivity.

Jeff W Barclay1, Margaret E Graham, Mark R Edwards

  • 1The Physiological Laboratory, School of Biomedical Sciences, University of Liverpool, Crown Street, Liverpool L69 3BX, UK. barclayj@liv.ac.uk

Biochemical Society Transactions
|January 16, 2010
PubMed
Summary
This summary is machine-generated.

Ethanol affects nerve cell communication presynaptically. Research in C. elegans identifies key proteins like Munc18-1 and Rab3 involved in ethanol

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Ethanol (alcohol) acutely modulates nervous system signaling.
  • Effects are both presynaptic and postsynaptic, with more research on postsynaptic targets.
  • Presynaptic mechanisms of ethanol sensitivity are less understood.

Purpose of the Study:

  • To review recent findings on presynaptic ethanol effects.
  • To identify proteins and interactions mediating ethanol sensitivity.
  • To link findings in model organisms to mammalian alcohol abuse studies.

Main Methods:

  • Review of existing research, focusing on studies in Caenorhabditis elegans.
  • Identification of specific proteins (Munc18-1, Rab3) and processes (synaptic vesicle recruitment, fusion).
  • Comparative analysis with mammalian studies on alcohol abuse.

Main Results:

  • Specific proteins, including Munc18-1 and Rab3, are crucial for transducing presynaptic ethanol effects in C. elegans.
  • Synaptic vesicle recruitment and fusion processes are key targets of ethanol's presynaptic action.
  • Identified proteins and interactions show potential relevance to mammalian alcohol sensitivity.

Conclusions:

  • Presynaptic mechanisms, involving proteins like Munc18-1 and Rab3, play a significant role in ethanol's neurological effects.
  • C. elegans serves as a valuable model for dissecting molecular pathways of ethanol sensitivity.
  • These findings offer insights into the molecular basis of alcohol abuse in mammals.