Effect of metergoline on human anxiety

Area of Science:

• Neuroscience
• Psychopharmacology

Background:

• Serotonin (5-HT) is implicated in mood regulation.
• Its specific role in subjective anxiety requires further elucidation.

Purpose of the Study:

• To investigate the role of serotonin (5-HT) in subjective anxiety.
• To assess the anxiogenic or anxiolytic effects of a 5-HT antagonist and a benzodiazepine.

Main Methods:

• Double-blind, placebo-controlled study with 36 healthy volunteers.
• Administration of metergoline (12 mg), diazepam (10 mg), or placebo.
• Assessment of subjective anxiety using Spielberg's State-Trait Anxiety Inventory during a simulated public speaking (SPS) test.

Main Results:

• Metergoline significantly increased state-anxiety scores compared to placebo and diazepam.
• Diazepam did not significantly alter subjective anxiety levels.
• The SPS test increased anxiety in placebo and diazepam groups, but not significantly in the metergoline group due to high baseline anxiety.

Conclusions:

• Results suggest an inhibitory role for serotonin (5-HT) in subjective anxiety.
• Metergoline's pro-anxiety effects support the hypothesis of 5-HT's inhibitory function.
• Further research is warranted to confirm the central nervous system's 5-HT modulation of anxiety.