Low prolactin response to fenfluramine in impulsive aggression.

Area of Science:

• Neuroendocrinology
• Psychiatry
• Clinical Psychology

Background:

• Impulsive aggression is a complex behavior associated with personality disorders.
• Previous research suggests a link between neuroendocrine function and aggression.
• The prolactin (PRL) response to fenfluramine challenge is a potential biomarker for central serotonergic activity.

Purpose of the Study:

• To investigate the prolactin (PRL) response to d,l-fenfluramine in a large cohort of personality disorder patients exhibiting impulsive aggression.
• To determine if PRL response to fenfluramine differs between patients with personality disorders and healthy controls.
• To explore the relationship between PRL response, impulsive aggression, and suicide history in personality disorder patients.

Main Methods:

• A large sample of 146 personality disorder patients and 23 controls underwent an oral d,l-fenfluramine challenge.
• Peak prolactin change (deltapkprl) was calculated by subtracting baseline PRL from peak response 3 hours post-administration.
• Statistical analyses, including ANOVA and regression, were employed to analyze group differences in deltapkprl.

Main Results:

• A blunted deltapkprl was observed in impulsive aggressive men with personality disorders compared to controls.
• This blunted PRL response was not significant in women with personality disorders.
• Men with a history of suicide attempts also exhibited a blunted deltapkprl, independent of depressive symptoms.

Conclusions:

• The findings replicate and extend previous research, confirming a blunted PRL response to fenfluramine in male personality disorder patients with impulsive aggression.
• This neuroendocrine abnormality may be a relevant biomarker for impulsive aggression and suicidal behavior in men with personality disorders.
• Further research is warranted to elucidate the underlying neurobiological mechanisms.