Prolactin: a pleiotropic neuroendocrine hormone.

Area of Science:

• Neuroendocrinology
• Neuroscience
• Hormone research

Background:

• Prolactin secretion is primarily inhibited by the hypothalamus.
• Unlike other pituitary hormones, prolactin exhibits short-loop feedback in the brain.
• Prolactin influences diverse brain functions, lacking a unified explanation.

Purpose of the Study:

• Review original studies on prolactin neuroendocrinology.
• Identify current progress and controversies.
• Propose a unifying hypothesis for prolactin's pleiotropic brain actions.

Main Methods:

• Literature review of seminal and recent studies.
• Analysis of neuroendocrine mechanisms.
• Hypothesis development based on existing data.

Main Results:

• Characterization of prolactin's unique hypothalamic inhibition.
• Documentation of short-loop feedback in the brain.
• Identification of multiple, seemingly unrelated brain functions influenced by prolactin.

Conclusions:

• Prolactin's neuroendocrine control is distinct.
• A unifying hypothesis is proposed to explain its widespread brain effects.
• Further research is needed to validate the proposed unifying theory.