Divergent expression of two prostaglandin E receptors (EP1 and EP3) in normal endometrium and in ovarian endometriosis

This study compared prostaglandin E receptor expression in normal endometrium versus ovarian endometriosis, analyzing immunohistochemistry from 46 women across menstrual-cycle phases and ectopic endometrial tissue from 15 endometriosis patients. EP1 expression was significantly higher in glandular cells and stromal cells during the proliferative phase than the early secretory phase, and EP1 was also higher in ectopic endometrial tissues; by contrast, EP3 expression showed opposite changes, being downregulated in glandular cells during the proliferative phase relative to early secretory phase and in ectopic tissues, with no EP3 differences in stromal cells. A key limitation is that the work focused on semiquantitative receptor expression differences rather than direct functional outcomes on implantation or endometriosis mechanisms. This paper is centrally about endometriosis — it specifically demonstrates divergent EP1 and EP3 expression patterns in normal endometrium versus ovarian endometriosis.

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