Regulation des G-Protein gekoppelten Östrogenrezeptors durch Stress, Entzündung und Östrogen im Rahmen der Pathophysiologie der Ovarendometriose

This study examined G-Protein–coupled estrogen receptor (GPER) expression in ovarian endometriosis by immunohistochemistry in 26 endometriosis patients and compared it with non-endometriosis ovarian/endometrial controls (26 ovaries and 13 endometria). The authors then used in silico identification of regulatory elements in the 3′ region of GPER-1 and functional stimulation of Ishikawa cells with stress hormones, inflammatory cytokines, and estrogen, quantifying GPER changes by immunochemistry, Western blot, and real-time PCR. They found GPER was upregulated in ovarian endometriosis in both stromal and epithelial components, with estrogen and stress hormones—especially prednisolone—strongly stimulating GPER, while inflammatory cytokines showed differential regulation (IL-1β and IL-4 increased GPER; TNFα and IFNγ decreased it), and PGE2 induced an alternative GPER isoform. The authors note it remains unknown whether the heightened GPER expression is only coincident with endometriosis-associated infertility or has a causal role, while they cite evidence for proliferative effects of GPER as a potential mechanistic link. This paper is centrally about endometriosis — it focuses on GPER expression and regulation by stress, inflammation, and estrogen in ovarian endometriosis.

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