Soluble adhesion molecules in serum throughout the menstrual cycle

Area of Science:

• Reproductive immunology
• Endocrinology
• Cellular immunology

Background:

• Female reproductive and immune systems share mediators.
• Cell adhesion molecules (CAMs) like ICAM-1, VCAM-1, and E-selectin are regulated by sex steroids and gonadotropins.
• Uterine and ovarian CAM expression shows cyclic regulation.

Purpose of the Study:

• To investigate cyclic changes in soluble CAMs (sICAM-1, sVCAM-1, sE-selectin) in peripheral blood during the menstrual cycle.
• To correlate these changes with hormone levels and immune cell counts.

Main Methods:

• Regular venous blood sampling throughout a complete menstrual cycle in normally cycling women.
• Measurement of soluble CAMs (sICAM-1, sVCAM-1, sE-selectin).
• Hormone and urinary metabolite level analysis for cycle tracking.

Main Results:

• Soluble ICAM-1 peaked in the early/mid-follicular phase and decreased significantly by the late luteal phase.
• Soluble VCAM-1 levels also declined in the late luteal phase.
• sE-selectin levels showed no significant cyclic variation.
• Inverse correlation found between sICAM-1 and estradiol.
• Negative correlation observed between sVCAM-1 and monocyte counts.

Conclusions:

• Cyclic variations in peripheral sICAM-1 and sVCAM-1 may indicate uterine/ovarian tissue remodeling.
• These findings are crucial for interpreting soluble CAM levels as biomarkers in women of reproductive age.