125 : The Role of BDNF Receptors in the Incidence of Endometrioma Tissue Invasion Onto the Chorioallantoic Membrane

Background and Aims: Previous studies have explored the role of neurotrophins and their receptors, especially in forming deep endometriosis, endometriosis tissue invasion, and its effects on tissue proliferation. However, these studies do not include research on the pathogenesis of endometriomas. We tried to model the invasion of endometrioma tissue to find out more about its pathogenesis by using the chorioallantoic membrane (CAM) as the host. Immunohistochemistry (IHC) to detect neurotrophin BDNF and its receptors, namely TrkB and P75, are employed and linked between their expression and the process of invasion and proliferation. Method: The endometriotic tissue samples were collected from women (n=27) who underwent hysteroscopy/laparoscopy at Dr. Sardjito Central Hospital. Peritoneal endometriosis (PE) lession, endometrioma (CC), and eutopic endometrium (EN) was analyzed with 15 tissue samples in each group. Samples were placed in a tube containing transport medium and transplanted into CAM of fertile chicken eggs for five days. Transplanted tissue was harvested, and histological preparations were made using the paraffin method. IHC staining was performed on p75, Ki67, TrkB, and BDNF staining. Invasion analysis and IHC evaluation were performed with a semi-quantitative method. Data were analyzed using IBMⓇ SPSS Statistics version 25.0. Statistical significance was accepted at P < 0.05. Results: Normal Endometrium expressed the highest expression of BDNF than peritoneal endometriosis and endometrioma (0.36± 0.38, 0.16± 0.13, 0.07± 0.07, P=0.007). The P75 expression correlated positively with Ki67 expression in PE and CC samples (P=0.012; P=0.008). Conclusion: The p75 receptor may have a role in endometriosis tissue proliferation, but this receptor does not directly influence tissue invasion into CAM. While proliferation in endometriomas positively correlates with invasion into CAM, it is not correlated with peritoneal endometriosis.