Copeptin response to panic provocation with CO₂ in healthy adults

Area of Science:

• Neuroendocrinology
• Psychophysiology
• Stress Research

Background:

• Panic disorder is characterized by recurrent panic attacks, causing significant psychological and physiological distress.
• The activation of the hypothalamic-pituitary-adrenal (HPA) axis during panic attacks is not fully understood, with inconsistent findings.
• Copeptin (CoP) offers a stable surrogate marker for vasopressinergic hypothalamic activity.

Purpose of the Study:

• To investigate hypothalamic-pituitary-adrenal (HPA)-axis activity during experimentally induced panic attacks.
• To assess Copeptin (CoP) as a marker of vasopressinergic hypothalamic activity.
• To explore correlations between CoP, peripheral HPA hormones (ACTH, cortisol), and psychological panic symptoms.

Main Methods:

• A placebo-controlled panic challenge using 35% CO2 inhalation in healthy adults (N=21).
• Measurement of plasma Copeptin (CoP), Adrenocorticotropic Releasing Hormone (ACTH), and cortisol.
• Assessment of psychological panic symptoms and analysis of hormonal secretion patterns over time.

Main Results:

• A significant increase in CoP plasma levels and psychological panic symptoms was observed after CO2 administration.
• No significant correlations were found between CoP levels and peripheral HPA-axis hormones (ACTH, cortisol) or panic symptom severity.
• No gender-based differences were found in psychological responses or CoP levels/release during the experiment.

Conclusions:

• Copeptin (CoP) shows potential as a sensitive indicator of acute hypothalamic response during stress and panic attacks.
• The study highlights the utility of CoP in understanding the physiological underpinnings of panic.
• Further research is needed to clarify the relationship between CoP and the peripheral HPA axis in panic states.