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Neurochemical Transmission: Sites of Drug Action

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...

Classification of Neurotransmitters

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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...

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 specific...

Drugs Affecting Neurotransmitter Release or Uptake

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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...

Neurotransmitters

Neurotransmitters

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...

Neurotransmitters

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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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A High-content Assay for Monitoring AMPA Receptor Trafficking

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Presynaptic autoreceptors regulating transmitter release.

Salomon Z Langer¹

¹Alpha-2 Pharmaceutica AB, 8 Rosemblum Street, Apt. 4650, Tel Aviv 69379, Israel. salomon@compugen.co.il

Neurochemistry International

|June 23, 2007

Summary

Presynaptic receptors on nerve terminals modulate neurotransmitter release, offering a novel therapeutic target. Targeting these receptors with drugs may provide treatments with fewer side effects than traditional methods.

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Area of Science:

Neuroscience
Pharmacology
Cell Biology

Background:

Neuronal communication was traditionally viewed as unidirectional, from presynaptic to postsynaptic neurons.
Presynaptic nerve terminals possess receptors on their cytoplasmic membrane that modulate neurotransmitter release.
This discovery challenges the traditional unidirectional model of neuronal signaling.

Purpose of the Study:

To highlight the significance of presynaptic receptors in modulating neurotransmitter release.
To explore the therapeutic potential of targeting presynaptic receptors.
To compare the therapeutic advantages of targeting presynaptic versus postsynaptic receptors.

Main Methods:

Review of established concepts in neuroscience and pharmacology.
Analysis of the mechanism of action of presynaptic autoreceptors and heteroreceptors.
Evaluation of pharmacological interventions using agonists and antagonists.

Main Results:

Presynaptic receptors receive signals from the synaptic cleft, influencing neurotransmitter release.
Autoreceptors and heteroreceptors on presynaptic terminals are viable targets for drug development.
Pharmacological modulation of presynaptic receptors offers a potential therapeutic strategy.

Conclusions:

Targeting presynaptic receptors represents a novel approach for therapeutic intervention.
Drugs acting on presynaptic receptors may offer improved efficacy and reduced side effects compared to postsynaptic targeting.
Modulating neurotransmitter release via presynaptic receptors holds promise for treating various neurological conditions.