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Related Concept Videos

Drugs Affecting Neurotransmitter Synthesis01:29

Drugs Affecting Neurotransmitter Synthesis

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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,...
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Neurochemical Transmission: Sites of Drug Action01:26

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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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Excitatory and Inhibitory Effects of Neurotransmitters01:29

Excitatory and Inhibitory Effects of Neurotransmitters

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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...
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Drugs Affecting Neurotransmitter Release or Uptake01:21

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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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The Synapse02:47

The Synapse

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Neurons communicate with one another by passing on their electrical signals to other neurons. A synapse is the location where two neurons meet to exchange signals. At the synapse, the neuron that sends the signal is called the presynaptic cell, while the neuron that receives the message is called the postsynaptic cell. Note that most neurons can be both presynaptic and postsynaptic, as they both transmit and receive information.
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Adrenergic Neurons: Neurotransmission01:27

Adrenergic Neurons: Neurotransmission

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Postganglionic sympathetic fibers (except those supplying the sweat glands) releasing noradrenaline or norepinephrine are called noradrenergic or adrenergic neurons. Noradrenaline, dopamine, adrenaline, or epinephrine are collectively called "catecholamines" as they contain a catechol moiety and an amine side chain. The five stages of neurotransmitter release involve their synthesis, storage, release, reuptake and metabolism.
Synthesis: Catecholamine synthesis requires tyrosine, which...
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Dopamine Release at Individual Presynaptic Terminals Visualized with FFNs
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Redefining dopaminergic synapses beyond the classical paradigm.

Kenshiro Fujise1, Jaya Mishra2, Nasser Karmali2

  • 1Department of Neuroscience, Yale University School of Medicine, New Haven, CT 06510, USA; Department of Frontier Science and Interdisciplinary Research, Faculty of Medicine, Kanazawa University, Kanazawa, Japan.

Trends in Neurosciences
|October 16, 2025
PubMed
Summary
This summary is machine-generated.

Dopamine neurons form unique synapses lacking traditional structures. Recent advances reveal diverse dopamine vesicle pools and synapse types, impacting Parkinson's disease research.

Keywords:
Parkinson’s diseaseVMAT2high-resolution imagingsynaptic vesiclessynaptophysin

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Synaptic Plasticity

Background:

  • Traditional synapse definition includes presynaptic vesicle pools and postsynaptic densities.
  • Dopaminergic neurons often exhibit bouton-like structures lacking conventional postsynaptic specializations.
  • Understanding dopamine terminal structure is crucial for neurodegenerative disease research.

Purpose of the Study:

  • To review recent findings on dopamine vesicle pools and dopaminergic terminal structures.
  • To discuss the implications of non-classical synapse architectures in dopaminergic neurons.
  • To explore the role of Parkinson's disease-associated proteins in synaptic integrity.

Main Methods:

  • High-resolution imaging techniques (electron microscopy, correlative light and electron microscopy).
  • Nanosensor technology.
  • In vitro models of dopaminergic terminals.

Main Results:

  • Revealed molecular identities and spatial organization of distinct dopamine vesicle pools.
  • Demonstrated a structural continuum in dopaminergic terminals, including non-classical architectures.
  • Highlighted emerging concepts like dopamine hub synapses and vesicle heterogeneity.

Conclusions:

  • Recent findings are reshaping the understanding of dopamine vesicles and synapse structure.
  • Vesicle heterogeneity and non-classical architectures are key features of dopaminergic terminals.
  • Dysfunction of Parkinson's disease proteins impacts synaptic integrity and dopaminergic neuron vulnerability.