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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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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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Adrenergic Agonists: Indirect-Acting Agents01:25

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Indirect-acting adrenergic agonists potentiate the effects of endogenous catecholamines through different mechanisms without directly binding to adrenoceptors.
One mechanism involves depleting stored catecholamines by displacing them from synaptic vesicles. These agents, known as "displacers," are transported into vesicles at the expense of noradrenaline. Examples include amphetamine and tyramine, which lack a catechol moiety, resulting in prolonged action, improved oral...
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Adrenergic Neurons: Neurotransmission01:27

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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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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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Attention-Deficit/Hyperactivity Disorder01:30

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Attention-deficit/hyperactivity disorder (ADHD) is a neurodevelopmental disorder characterized by persistent inattention, hyperactivity, and impulsivity. It affects approximately 5-8% of children globally, with around 60-70% of cases persisting into adulthood. ADHD has significant implications for educational attainment, social interactions, and occupational success.
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Updated: Mar 26, 2026

Comprehensive Profiling of Dopamine Regulation in Substantia Nigra and Ventral Tegmental Area
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Norepinephrine versus dopamine and their interaction in modulating synaptic function in the prefrontal cortex.

Bo Xing1, Yan-Chun Li1, Wen-Jun Gao1

  • 1Department of Neurobiology and Anatomy, Drexel University College of Medicine, 2900 Queen Lane, Philadelphia PA 19129, United States.

Brain Research
|January 22, 2016
PubMed
Summary
This summary is machine-generated.

Norepinephrine (NE) and dopamine (DA) are key neuromodulators influencing prefrontal cortex (PFC) function, impacting working memory and attention. Understanding their interaction is crucial for addressing neuropsychiatric disorders like ADHD and schizophrenia.

Keywords:
DopamineNeuromodulatorNorepinephrinePrefrontal cortexPsychiatric disorders

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Area of Science:

  • Neuroscience
  • Neuropharmacology

Background:

  • Norepinephrine (NE) and dopamine (DA) are critical catecholamine neuromodulators regulating prefrontal cortex (PFC) circuit function.
  • Dysregulation of NE and DA signaling is linked to neuropsychiatric disorders such as ADHD, PTSD, schizophrenia, and addiction.

Purpose of the Study:

  • To review and synthesize existing research on the functional interactions between NE and DA in the PFC.
  • To elucidate how NE and DA modulate excitatory and inhibitory transmissions within the PFC circuitry.

Main Methods:

  • Systematic review of previous studies investigating NE and DA effects on PFC.
  • Focus on synaptic integration, signaling pathways, and receptor properties modulated by these catecholamines.

Main Results:

  • Both NE and DA extensively innervate the PFC, modulating synaptic function through distinct receptor subtypes and signaling pathways.
  • The precise mechanisms of NE and DA cooperative control over PFC functions remain incompletely understood.

Conclusions:

  • NE and DA play significant roles in PFC-mediated working memory and attention.
  • Further research is needed to clarify the coordinated actions of NE and DA in optimizing PFC function for adaptive behavior.