Acquired hypoprolactinemia in men, possible phenotype.

Area of Science:

• Endocrinology
• Men's Health
• Metabolic Syndrome

Background:

• The physiological role of prolactin (PRL) in males remains incompletely understood.
• While hyperprolactinemia is linked to sexual dysfunction, the clinical significance of low PRL levels in men is largely neglected.
• Existing research primarily focuses on prolactin's effects in women, leaving male-specific roles under-explored.

Purpose of the Study:

• To critically review and summarize the potential clinical phenotypes associated with reduced prolactin levels in men.
• To consolidate available evidence, including meta-analytic data where possible, on the consequences of male hypoprolactinemia.
• To highlight the under-investigated aspects of low prolactin in male health.

Main Methods:

• Systematic review and critical discussion of existing literature.
• Inclusion of data from clinical case series of patients with sexual dysfunction.
• Analysis of cross-sectional and longitudinal studies investigating male prolactin levels.
• Inclusion of meta-analytic results where available.

Main Results:

• Low prolactin levels in men are associated with a poorer metabolic profile, including an increased prevalence of diabetes mellitus.
• Reduced PRL is linked to mood disturbances such as anxiety and depression.
• Hypoprolactinemia in males correlates with sexual dysfunctions, specifically psychogenic erectile and ejaculatory dysfunctions.

Conclusions:

• Low prolactin levels in men represent a potentially significant clinical issue.
• The observed associations suggest a link between hypoprolactinemia and adverse metabolic, mood, and sexual health outcomes.
• Further research is warranted to elucidate the direct causal relationships and underlying mechanisms of PRL deficiency in men.