Cyclophilin B serum levels present variations across the menstrual cycle

Area of Science:

• Reproductive Endocrinology
• Immunology
• Cell Biology

Background:

• Cyclophilins are chaperones involved in inflammation and cell death.
• Cyclophilin B (CypB) interacts with CD147, influencing matrix metalloproteinases.
• Cyclophilin D (CypD) is implicated in hypoxia-induced apoptosis.
• Previous research linked hormones like estradiol and prolactin to cyclophilins, but menstrual cycle variations were unknown.

Purpose of the Study:

• To determine blood concentrations of cyclophilin B and cyclophilin D throughout the menstrual cycle.
• To investigate potential correlations between cyclophilin levels and key reproductive hormones.

Main Methods:

• Blood samples were collected from eleven healthy women during the follicular, periovulatory, and mid-luteal phases of their menstrual cycle.
• Hormone and cyclophilin levels were quantified.
• Statistical analyses included repeated measures ANOVA, t-tests, and Spearman correlations.

Main Results:

• Cyclophilin B concentrations showed significant differences across the menstrual cycle, with highest levels in the follicular phase.
• Cyclophilin D exhibited a similar trend, though not statistically significant.
• Cyclophilin D positively correlated with luteinizing hormone (LH) during the periovulatory phase and follicle-stimulating hormone (FSH) in the mid-luteal phase.

Conclusions:

• This is the first study to document changes in cyclophilin B levels throughout the menstrual cycle.
• The findings suggest a potential role for cyclophilins in the cyclic inflammatory processes within the female reproductive system.
• The association between cyclophilin D and LH/FSH warrants further investigation.