Copeptin levels remain unchanged during the menstrual cycle

Area of Science:

• Endocrinology
• Reproductive Biology
• Biomarker Research

Background:

• Copeptin, a marker for arginine vasopressin, is studied as a biomarker for stress and inflammation.
• Its role during the menstrual cycle and relation to sex hormones, inflammation, and body fluid requires investigation.

Purpose of the Study:

• To investigate copeptin levels throughout the menstrual cycle.
• To explore the relationship between copeptin, sex hormones (progesterone, estradiol, luteinizing hormone), subclinical inflammation markers (hs-CRP, TNF-alpha, procalcitonin), and body fluid estimates.

Main Methods:

• 15 healthy women with regular menstrual cycles participated.
• Blood samples were collected on 15 defined cycle days for hormonal and inflammatory marker assays.
• Bioimpedance analysis estimated body fluid, and premenstrual symptoms were recorded.

Main Results:

• Copeptin levels showed no significant variation across the menstrual cycle (p=0.16).
• Changes in estradiol (p=0.002) and physical premenstrual symptom scores (p=0.01) were positively correlated with copeptin.
• No significant relationships were found between copeptin and other sex hormones, inflammation markers, or body fluid estimates.

Conclusions:

• Copeptin does not significantly fluctuate during the menstrual cycle.
• Estradiol and physical premenstrual symptoms may influence copeptin levels, warranting further research into their interplay.