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Prolactin studies in normals: implications for clinical research.

Psychiatry Research

|April 1, 1983

Summary

Dopaminergic regulation of prolactin is complex. Individual prolactin levels are stable over time, suggesting longitudinal studies are best for assessing mental illness. Combined drug challenges reveal more about dopamine abnormalities than single challenges.

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Area of Science:

Neuroendocrinology
Psychiatry
Pharmacology

Background:

Dopaminergic (DA) transmission significantly influences pituitary prolactin (PRL) secretion.
Current methods assessing DA regulation in mental illness via PRL levels have limitations, including high interindividual variability and confounding factors.
Intraindividual variability of PRL levels and responses to DA challenges is not well understood.

Purpose of the Study:

To investigate the stability of basal serum PRL levels in individuals over time.
To evaluate the utility of combined DA agonist and antagonist challenges for assessing DA regulation.
To determine if combined challenges offer greater insight into DA abnormalities compared to single challenges.

Main Methods:

Longitudinal measurement of basal serum PRL levels in a cohort of normal individuals over a 10-month period.
Administration of haloperidol (DA antagonist) and combined haloperidol + apomorphine (DA agonist) challenges in normal individuals.
Analysis of PRL level stability, interindividual vs. intraindividual variance, and PRL response correlations.

Main Results:

Basal serum PRL levels demonstrated high stability within individuals over 10 months, with interindividual variance significantly exceeding intraindividual variance.
A strong correlation was observed between PRL responses to haloperidol alone and combined haloperidol + apomorphine challenges.
The addition of apomorphine significantly reduced the PRL response by 51%, highlighting the impact of combined DA modulation.

Conclusions:

Longitudinal measurement designs are recommended for studying state-dependent alterations in mental illness to mitigate confounding interindividual variability.
Individual variations in PRL levels, even within the normal range, may hold physiological significance.
Combined DA agonist and antagonist challenges may be more effective in revealing DA dysregulation in abnormal populations than single-agent challenges.

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