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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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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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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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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.
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Indirect-acting adrenergic agonists potentiate the effects of endogenous catecholamines through different mechanisms without directly binding to adrenoceptors.
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Neurotransmitters play a crucial role in the communication between neurons in the autonomic nervous system. Neurons in the autonomic nervous system can be cholinergic or adrenergic depending on the neurotransmitters synthesized. Cholinergic neurons use acetylcholine as their primary neurotransmitter. This includes all the preganglionic fibers of the sympathetic and pre- and postganglionic fibers of the parasympathetic nervous systems. In addition, neurons of the somatic nervous system also use...
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Single Cell Measurement of Dopamine Release with Simultaneous Voltage-clamp and Amperometry
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Coding principles of dopaminergic transmission modes.

Limeng Huang1, Yuanyu Chang2, Zhipeng Yang1

  • 1Department of Pharmacology, University of Virginia School of Medicine, Charlottesville, VA 22903, USA.

Science Advances
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Summary

New imaging methods reveal how dopamine neuron firing patterns control neurotransmitter release. Different firing modes dictate whether dopamine acts locally in synapses or spreads to influence broader brain circuits.

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Area of Science:

  • Neuroscience
  • Cellular Biology
  • Neurochemistry

Background:

  • Dopaminergic neurons modulate crucial behaviors through complex firing patterns.
  • The exact mechanisms governing dopamine release and transmission remain incompletely understood.

Purpose of the Study:

  • To elucidate the relationship between dopaminergic neuron firing patterns and dopamine transmission modes.
  • To investigate how different firing frequencies and synchrony influence dopamine signaling dynamics.

Main Methods:

  • Development of a multiplexed imaging and voltammetry technique using genetically encoded sensors.
  • Simultaneous recording of synaptic, perisynaptic, and extrasynaptic dopamine transmission in mouse central neurons.
  • Application of a genetically encoded sensor-based image analysis program.

Main Results:

  • Heterogeneous dopaminergic firing patterns generate distinct transmission modes.
  • Dopamine transmission is encoded by neurotransmitter quantity, synapse count, and synchrony of firing pulses.
  • Synaptic transmission dominates under tonic and low-frequency activity due to efficient dopamine reuptake.
  • High-frequency or synchronized firing, or transporter inhibition, leads to dopamine escaping synaptic clefts, enabling volume transmission.

Conclusions:

  • A collaborative mechanism involving synaptic enclosures, properties, and transporters dictates dopamine transmission modes.
  • Activity pattern-dependent coding principles govern dopaminergic transmission.
  • This study provides novel insights into the regulation of dopamine signaling in the central nervous system.