Vascularization in endometriosis and its clinical applications

NLRP3 inflammasome-mediated Pyroptosis induce Notch signal activation in endometriosis angiogenesis

Endometriosis is characterized by the presence of endometrial tissue outside the uterus that not only causes severe pelvic pain and infertility but also increased risk for ovarian carcinogenesis in women of reproductive age. Here, we found that angiogenesis was increased and accompanied with up-regulation of Notch1 in human endometriotic tissue sample, which is associated with pyroptosis induced by activation of endothelial NLRP3 inflammasome. Further, in endometriosis model induced in wild type and NLRP3-deficient (NLRP3-KO) mice, we found that deficiency of NLRP3 suppressing the development of endometriosis. In vitro, inhibiting the activation of NLRP3 inflammasome prevents LPS/ATP-induced tube formation in endothelial cells. Meanwhile, knockdown NLRP3 expression by gRNA disrupt the interaction between NICD and HIF-1α under the inflammatory microenvironment. This study demonstrates that activation of NLRP3 inflammasome-mediated pyroptosis affects angiogenesis in endometriosis via Notch1-dependent manner.

Abdominal wall endometriosis in a region distant to the caesarean section scar

Abdominal wall endometriosis (AWE) is a rare entity presenting as a painful lump with a cyclical pattern, associated with previous caesarean section (CS). AWE is typically located at the site of the CS scar. The diagnosis is challenging in the rare instance when AWE presents at a location distant to the CS scar. A 37-year-old patient presented to a general surgeon with a 2-year history of left-sided, periumbilical pain exacerbated during her menstrual periods. A 3 cm firm and tender nodule was noted clinically. Intraoperatively, the nodule involved the rectus muscle and infiltrated the peritoneum. Histology confirmed endometriosis, and the patient recovered uneventfully. The rarity of this clinical entity and the fact that AWE mostly presents to non-gynaecologists make the diagnosis challenging prolonging its physical and psychological morbidity. Thorough history-taking with emphasis on the pattern of pain and a previous history of CS should raise suspicion of AWE.