Aquaporin-9 and endometriomas: pathophysiological insights from a case-control study.

Area of Science:

• Reproductive medicine
• Molecular biology
• Biochemistry

Background:

• Endometriosis is an estrogen-dependent condition involving ectopic endometrial tissue.
• The molecular mechanisms of endometriosis persistence are not fully understood.
• Aquaporins (AQPs), including AQP9, are implicated in cell migration and proliferation, potentially relevant to endometriosis.

Purpose of the Study:

• To investigate aquaporin-9 (AQP9) concentrations in women with ovarian endometriomas compared to controls.
• To assess AQP9 levels in serum, peritoneal fluid, and cervicovaginal secretions.
• To determine the diagnostic potential of AQP9 in endometriosis.

Main Methods:

• Prospective case-control study involving 27 women with endometriomas and 30 healthy controls.
• Measurement of AQP9 levels using ELISA in serum, peritoneal fluid, and cervicovaginal secretions.
• Statistical analyses included correlation, ROC curve analysis, and logistic regression.

Main Results:

• Peritoneal fluid AQP9 concentrations were significantly higher in women with endometriomas (p=0.023).
• Serum and cervicovaginal AQP9 levels did not differ between groups.
• Elevated peritoneal AQP9 was independently associated with endometrioma (OR 4.40, p=0.025).

Conclusions:

• Increased peritoneal fluid AQP9 suggests a role in endometriosis pathophysiology.
• AQP9 may be a biomarker for the local peritoneal microenvironment alterations in endometriosis.