Hormonal responses to meta-chlorophenylpiperazine (m-CPP) are undiminished by acute m-CPP pretreatment

Area of Science:

• Pharmacology
• Endocrinology
• Neuroscience

Background:

• Meta-chlorophenylpiperazine (m-CPP) is a serotonin receptor agonist used to probe neuroendocrine function.
• Understanding the stability of hormonal responses to pharmacological challenges is crucial for reliable clinical assessments.

Purpose of the Study:

• To evaluate the short-term (24-hour) stability of hormonal responses to meta-chlorophenylpiperazine (m-CPP) in healthy volunteers.
• To assess the reproducibility of prolactin and cortisol release following repeated oral administration of m-CPP.

Main Methods:

• Healthy volunteers underwent two identical oral challenges with m-CPP (0.5 mg/kg) on sequential days.
• Plasma levels of m-CPP, prolactin, and cortisol were measured to assess hormonal responses.
• Data were analyzed to compare the magnitude of responses between the two challenge days.

Main Results:

• Circulating m-CPP plasma levels were similar on both challenge days.
• Prolactin and cortisol responses to m-CPP administration showed comparable magnitudes on sequential days.
• The hormonal responses to m-CPP demonstrated high reproducibility over a 24-hour period.

Conclusions:

• Single oral administrations of m-CPP elicit stable prolactin and cortisol responses in healthy individuals over at least 24 hours.
• These findings support the reliability of using m-CPP challenges for assessing neuroendocrine function and hormonal stability.
• The study confirms the short-term stability of the prolactin and cortisol axes in response to m-CPP.