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Related Concept Videos

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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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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Indirect-acting adrenergic agonists potentiate the effects of endogenous catecholamines through different mechanisms without directly binding to adrenoceptors.
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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 sympathetic pathways of the collateral ganglia and adrenal medulla serve unique but interconnected roles in the sympathetic response.
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Neurotransmitters are essential chemical messengers within the nervous system, facilitating the communication between neurons. These chemical messengers, varying in function and effect, are critical for sustaining various aspects of neurological health and emotional well-being.
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Related Experiment Video

Updated: Jul 19, 2025

Comprehensive Profiling of Dopamine Regulation in Substantia Nigra and Ventral Tegmental Area
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Neurosteroids and the mesocorticolimbic system.

Désirée R Seib1, Daniel J Tobiansky2, John Meitzen3

  • 1Department of Psychology and Djavad Mowafaghian Centre for Brain Health, University of British Columbia, Vancouver, BC, Canada.

Neuroscience and Biobehavioral Reviews
|August 11, 2023
PubMed
Summary

Neurosteroids like neuroandrogens and neuroestrogens, produced in the brain and gonads, influence executive functions by affecting dopamine signaling in the mesocorticolimbic system.

Keywords:
17β-estradiolAndrogen receptorAromataseBrainSet shiftingTestosterone

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Area of Science:

  • Neuroendocrinology
  • Neuroscience
  • Cognitive Science

Background:

  • The mesocorticolimbic system is crucial for executive functions, including working memory and behavioral flexibility.
  • This system involves dopaminergic pathways connecting the ventral tegmental area to the nucleus accumbens and medial prefrontal cortex.
  • Emerging evidence indicates neurosteroid production and receptor expression within key brain regions.

Purpose of the Study:

  • To review the role of neurosteroids in the mesocorticolimbic system.
  • To examine the synthesis and function of neuroandrogens and neuroestrogens within this circuit.
  • To elucidate how these neurosteroids modulate dopamine signaling and executive functions.

Main Methods:

  • Literature review of existing research on neurosteroids and the mesocorticolimbic system.
  • Analysis of studies investigating neurosteroid synthesis and receptor expression in brain cells.
  • Synthesis of findings on the impact of neuroandrogens and neuroestrogens on dopamine signaling and cognitive processes.

Main Results:

  • Cells within the mesocorticolimbic system produce neurosteroids, including neuroandrogens and neuroestrogens.
  • These neurosteroids bind to specific androgen and estrogen receptors within the brain.
  • Neuroandrogens and neuroestrogens modulate dopamine signaling, thereby influencing executive functions.

Conclusions:

  • Steroids synthesized both in the gonads and locally within the brain play a significant role in higher-order cognition.
  • Neurosteroids are integral modulators of executive functions through their effects on the mesocorticolimbic dopamine system.
  • This highlights a critical interplay between the neuroendocrine and nervous systems in cognitive regulation.