Melatonin's actions are not limited to sleep

Area of Science:

• Endocrinology
• Neuroscience
• Pharmacology

Background:

• Melatonin is a widely used supplement, primarily for sleep disorders.
• Its consumption has significantly increased in recent years.
• A potential side effect, increased prolactin secretion, is often overlooked.

Purpose of the Study:

• To highlight the overlooked effect of melatonin on prolactin secretion.
• To investigate the mechanism of melatonin-induced prolactin increase via dopaminergic neurons.
• To raise awareness of potential hyperprolactinemia due to increased melatonin usage.

Main Methods:

• Review of existing literature on melatonin's effects on hypothalamic dopaminergic neurons.
• Analysis of the physiological pathway linking melatonin to prolactin secretion.
• Correlation of increased melatonin consumption with potential clinical findings.

Main Results:

• Melatonin administration leads to increased prolactin secretion.
• This effect is mediated through melatonin's action on hypothalamic dopaminergic neurons.
• The rise in melatonin use suggests a potential increase in observed hyperprolactinemia.

Conclusions:

• Melatonin's impact on prolactin secretion is a significant, yet underappreciated, clinical consideration.
• Increased prevalence of melatonin use may lead to more frequent diagnoses of hyperprolactinemia.
• Further research is warranted to fully understand and manage this melatonin-induced endocrine effect.