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Neurotransmitters in anxiety.

Archives of General Psychiatry

|June 1, 1982

Summary

The neurotransmitter gamma-aminobutyric acid (GABA) and specific benzodiazepine receptors are key to predictable anxiolytic effects. Anxiety may involve noradrenergic and serotonergic systems, with distinct disorders potentially having different mechanisms.

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Area of Science:

Neuroscience
Pharmacology
Psychiatry

Background:

Anxiolytic effects are primarily linked to gamma-aminobutyric acid (GABA)-ergic systems and benzodiazepine receptors.
Subtypes of benzodiazepine receptors may be specifically involved in anxiolytic actions.
The noradrenergic and serotonergic systems are implicated in mediating anxiety, though evidence is partial.

Purpose of the Study:

To explore the neurochemical underpinnings of anxiety and anxiolytic effects.
To investigate the roles of various neurotransmitter systems in anxiety disorders.
To identify potential distinct mechanisms underlying different anxiety disorders.

Main Methods:

Review of existing literature on neurotransmitter systems and anxiety.
Analysis of findings from animal studies and clinical drug responses.
Examination of the specific roles of GABA, noradrenergic, and serotonergic systems.

Main Results:

Gamma-aminobutyric acid (GABA) activation of specific benzodiazepine receptors is the most predictable anxiolytic pathway.
Noradrenergic system involvement in anxiety was only partially confirmed in recent studies.
The serotonergic system plays a role in certain anxiety types, while other neurotransmitters appear to have minimal impact.
Clinical drug responses suggest at least two distinct types of anxiety disorders exist.

Conclusions:

The gamma-aminobutyric acid (GABA)/benzodiazepine receptor system is central to anxiolysis.
Anxiety involves complex interactions within the noradrenergic and serotonergic systems.
Distinct psychobiologic mechanisms likely underlie different anxiety disorders, warranting further investigation.

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