Impaired human ovarian follicular fluid complement function in hereditary angioedema

Area of Science:

• Immunology
• Reproductive Biology
• Human Physiology

Background:

• Complement system plays a role in ovulation.
• Hereditary angioedema (HAE) is associated with complement dysfunction and ovarian abnormalities.
• Understanding complement's role in ovarian function is crucial.

Purpose of the Study:

• To investigate complement activity in human ovarian follicular fluid.
• To compare complement function in follicular fluid of healthy women and HAE patients.
• To explore the relationship between complement dysfunction and ovarian abnormalities in HAE.

Main Methods:

• Assessed functional complement activities (total hemolytic complement, classical and alternative pathways, C1 inhibitor) in follicular fluid and serum.
• Quantified complement components (C1 inhibitor, C4, C3, Factor B).
• Clinical evaluation of ovarian morphology and response to danazol treatment.

Main Results:

• Healthy women possess active complement in follicular fluid within normal serum ranges.
• HAE patients show significantly reduced classical pathway activity and undetectable C1 inhibitor in follicular fluid.
• HAE patients exhibit similar complement profiles in serum and follicular fluid, with ovarian abnormalities that improve with danazol treatment.

Conclusions:

• Active complement in follicular fluid is vital for ovulation.
• Complement dysfunction in HAE patients is linked to ovarian abnormalities.
• Danazol treatment in HAE patients normalizes ovarian morphology and improves complement function, suggesting a therapeutic link.