Future suicide attempt and responses to serotonergic challenge

Area of Science:

• Neuroendocrinology
• Psychiatry
• Behavioral Neuroscience

Background:

• Blunted neurohormonal responses to serotonergic agents are linked to major depression and suicidal behavior.
• Previous studies lacked prospective data on the relationship between these responses and future suicide attempts.

Purpose of the Study:

• To prospectively investigate the association between neurohormonal and mood responses to a serotonergic challenge and later suicide attempts.
• To identify potential biological and psychological predictors of suicide attempts in individuals with and without depression.

Main Methods:

• Healthy volunteers and depressed subjects underwent a fenfluramine (FEN) challenge test at baseline.
• Subjects were followed for 2 years, with assessments of plasma prolactin and cortisol, mood (POMS), and behavior.
• Comparison of neurohormonal and mood responses between healthy controls, depressed non-attempters, past attempters, and future attempters.

Main Results:

• Future suicide attempters exhibited lower plasma prolactin and cortisol responses to FEN compared to non-attempters and healthy controls.
• Depressed future attempters showed a worsening of mood scores after FEN, unlike other groups.
• Lower cortisol response correlated with increased suicidal ideation over time.
• Blunted cortisol response, unfavorable mood changes after FEN, and younger age predicted later suicide attempts in a majority of cases.

Conclusions:

• Blunted cortisol response and unfavorable acute mood response to serotonergic challenge may serve as risk factors for future suicide attempts.
• These neuroendocrine and psychological markers could aid in identifying individuals at higher risk for suicide.
• Further research is warranted to explore the clinical utility of these findings in suicide prevention strategies.