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Plasminogen activators in ectopic and uterine endometrium
S Fernández-Shaw1, J M Marshall, B Hicks
1University of Oxford, John Radcliffe Hospital, United Kingdom.
Fertility and Sterility
|January 1, 1995
Summary
Endometriosis does not alter uterine endometrium's plasminogen activator (PA) expression. Ectopic endometrium shows high plasminogen and urokinase levels, suggesting increased invasiveness in endometriosis patients.
Area of Science:
- Reproductive biology
- Molecular pathology
Background:
- Endometriosis is a condition where endometrial-like tissue grows outside the uterus.
- The plasminogen activator (PA)-plasmin system is crucial for tissue remodeling and invasion.
Purpose of the Study:
- To compare the expression of PA-plasmin system components in uterine and ectopic endometrium.
- To determine if altered PA expression in uterine endometrium contributes to endometriosis development.
Main Methods:
- Immunohistochemistry was used to detect plasminogen, urokinase plasminogen activator (uPA), tissue plasminogen activator (tPA), and PA inhibitors (PAI-1, PAI-2).
- Samples were analyzed from women with and without endometriosis, comparing uterine and ectopic tissues.
Main Results:
- No significant differences in PA-plasmin system component expression were observed in uterine endometrium between women with and without endometriosis.
- Ectopic endometrium consistently exhibited high levels of plasminogen and uPA, independent of the menstrual cycle.
- PA inhibitors (PAI-1 and PAI-2) were not detected in either uterine or ectopic endometrium.
Conclusions:
- Uterine endometrium in women with endometriosis does not show increased PA expression, refuting a role in initial implantation.
- Elevated plasminogen and uPA in ectopic endometrium suggest a more invasive potential of endometriotic implants in the peritoneal cavity.