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Related Concept Videos

Drugs Acting on Autonomic Ganglia: Stimulants01:23

Drugs Acting on Autonomic Ganglia: Stimulants

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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...
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CNS Depressants: Alcohol and Nicotine01:27

CNS Depressants: Alcohol and Nicotine

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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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Cholinergic Receptors: Nicotinic01:15

Cholinergic Receptors: Nicotinic

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Nicotinic receptors are ligand-gated ion channels that are activated by acetylcholine and nicotine. Upon activation, they cause a rapid increase in the permeability of cells to K+, Na+, and Ca2+, followed by depolarization and excitation. They are in the autonomic ganglia, skeletal neuromuscular junction, CNS, and adrenal medulla.
There are two types of nicotinic receptors: neuromuscular (NM/NM/N1) and neuronal (NN/NN/N2). The two families differ based on their location and selectivity to...
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Stimulants01:29

Stimulants

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Stimulants are substances that enhance neural activity and elevate dopamine levels in the brain, leading to their highly addictive nature. These drugs include cocaine, amphetamines, MDMA, caffeine, and nicotine, each with distinct mechanisms of action and varied health implications.
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Neurochemical Transmission: Sites of Drug Action01:26

Neurochemical Transmission: Sites of Drug Action

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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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Ligand-Gated Ion Channel Receptor: Gating Mechanism01:30

Ligand-Gated Ion Channel Receptor: Gating Mechanism

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Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
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Related Experiment Video

Updated: Jan 1, 2026

Live Imaging of Nicotine Induced Calcium Signaling and Neurotransmitter Release Along Ventral Hippocampal Axons
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Molecular mechanisms for nicotine intoxication.

Tursun Alkam1, Toshitaka Nabeshima2

  • 1Japanese Drug Organization of Appropriate Use and Research, Nagoya, Japan; Department of Basic Medical Sciences, College of Osteopathic Medicine of the Pacific, Western University of Health Sciences, Pomona, CA, USA.

Neurochemistry International
|February 20, 2019
PubMed
Summary

Nicotine, a toxic component of tobacco smoke, causes acute and chronic health issues. Understanding its mechanisms is crucial for prevention, treatment, and regulation of nicotine intoxication.

Keywords:
Acute nicotine intoxicationChronic nicotine intoxicationFetal brain developmentNewborn behaviorsNicotine productsPrenatal nicotine exposureSudden infant death syndromeTobacco sickness

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Spectral Confocal Imaging of Fluorescently tagged Nicotinic Receptors in Knock-in Mice with Chronic Nicotine Administration
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Area of Science:

  • Toxicology
  • Neuroscience
  • Pharmacology

Background:

  • Nicotine is a primary toxicant in tobacco smoke, historically used as a pesticide.
  • Nicotine intoxication remains a significant public health concern due to accidental or intentional ingestion of nicotine products.
  • Understanding nicotine's toxic effects is vital for effective prevention, treatment, and regulatory strategies.

Purpose of the Study:

  • To review the pharmacokinetics of nicotine.
  • To elucidate the molecular mechanisms underlying acute and chronic nicotine intoxication.
  • To explore nicotine's impact on both the central and peripheral nervous systems.

Main Methods:

  • Literature review of existing research on nicotine pharmacokinetics and toxicology.
  • Analysis of molecular mechanisms associated with nicotine's neurotoxic effects.
  • Synthesis of data on various forms of nicotine intoxication, including green tobacco sickness and prenatal exposure.

Main Results:

  • Nicotine exhibits complex pharmacokinetics influencing its toxicological profile.
  • Molecular mechanisms reveal pathways for both acute and chronic neurotoxicity.
  • Nicotine exposure is linked to diverse health outcomes, including green tobacco sickness, altered circadian rhythms, and adverse effects on newborns.

Conclusions:

  • A comprehensive understanding of nicotine's pharmacokinetics and molecular toxicity is essential for managing intoxication.
  • The review highlights the broad spectrum of adverse effects, from acute poisoning to chronic developmental impacts.
  • Findings support the need for continued research and robust regulatory measures concerning nicotine products.