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Related Concept Videos

Drugs Affecting Neurotransmitter Synthesis01:29

Drugs Affecting Neurotransmitter Synthesis

Drugs affecting neurotransmitter synthesis can impact the adrenergic neuron and the synthesis of neurotransmitters. For example, α-methyltyrosine and carbidopa target specific enzymes involved in catecholamine synthesis. α-methyltyrosine inhibits the enzyme tyrosine hydroxylase, which converts tyrosine into dopamine. By blocking this enzyme, α-methyltyrosine reduces dopamine production and other catecholamines. Carbidopa, on the other hand, inhibits the enzyme dopa decarboxylase, which converts...
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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Excitatory and Inhibitory Effects of Neurotransmitters

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...
Drugs Acting on Autonomic Ganglia: Stimulants01:23

Drugs Acting on Autonomic Ganglia: Stimulants


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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Cholinergic Receptors: Nicotinic

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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Parkinson Disease ll: Pathophysiology

Parkinson disease (PD) is a progressive neurodegenerative disorder primarily affecting movement, with additional non-motor features. Its pathophysiology involves complex interactions among genetic susceptibility, environmental exposures, and cellular dysfunction, including dopaminergic neuron loss, protein aggregation, and mitochondrial impairment.Selective NeurodegenerationA key feature is the degeneration of dopaminergic neurons in the substantia nigra pars compacta, leading to reduced...

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Related Experiment Video

Updated: Jun 22, 2026

Environmental Modulations of the Number of Midbrain Dopamine Neurons in Adult Mice
09:35

Environmental Modulations of the Number of Midbrain Dopamine Neurons in Adult Mice

Published on: January 20, 2015

Age dependent nicotinic influences over dopamine neuron synaptic plasticity.

Andon N Placzek1, Tao A Zhang, John A Dani

  • 1Department of Neuroscience, Baylor College of Medicine, Houston, TX 77030, United States.

Biochemical Pharmacology
|May 26, 2009
PubMed
Summary

Adolescents are more vulnerable to nicotine addiction due to age-dependent changes in dopamine neuron sensitivity. Nicotine exposure causes long-term potentiation by altering glutamate receptors, increasing addiction risk.

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Last Updated: Jun 22, 2026

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Published on: January 20, 2015

Local Application of Drugs to Study Nicotinic Acetylcholine Receptor Function in Mouse Brain Slices
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Published on: October 29, 2012

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Published on: March 23, 2011

Area of Science:

  • Neuroscience
  • Addiction Research
  • Developmental Biology

Background:

  • The dopamine system in the ventral midbrain is crucial for learning adaptive behaviors.
  • Addictive drugs like nicotine impact this system by affecting nicotinic acetylcholine receptors (nAChRs).
  • Adolescents exhibit a heightened vulnerability to addiction, partly due to age-dependent drug sensitivity.

Purpose of the Study:

  • To investigate age-related differences in synaptic plasticity within the midbrain dopamine system.
  • To understand how nicotine exposure induces long-term potentiation (LTP) in dopamine neurons.
  • To explore the role of glutamate receptor shifts in adolescent nicotine addiction vulnerability.

Main Methods:

  • Examining synaptic plasticity at excitatory synapses onto dopamine neurons.
  • Quantifying long-term potentiation (LTP) following acute nicotine exposure.
  • Measuring shifts in ionotropic glutamate receptor subtypes (AMPA/NMDA ratio) at synapses.

Main Results:

  • Nicotine exposure induces long-term potentiation (LTP) in dopamine neurons.
  • This LTP is characterized by an increased ratio of AMPA receptors to NMDA receptors.
  • Age-dependent differences in dopamine system excitability and nicotine sensitivity were observed.

Conclusions:

  • Age-related synaptic plasticity in the midbrain dopamine system contributes to increased nicotine addiction risk in adolescents.
  • Understanding these neurobiological mechanisms is key to addressing adolescent addiction.
  • Nicotine's effects on glutamate receptor dynamics represent a critical factor in addiction vulnerability.