Endometriosis Research Today is a free monthly online journal that collates and summarizes the latest research about Endometriosis, including details on causes, treatment, symptoms, infertility. | ||||||||
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Decreased human leukocyte antigen-DR expression in the lipid raft by peritoneal macrophages from women with endometriosis.Yamamoto Y, Maeda N, Izumiya C, Kusume T, Oguri H, Kawashima M, Hayashi K, Nomura A, Yamashita C, Fukaya T Department of Obstetrics and Gynecology, Kochi Medical School, Kohasu, Oko, Nankoku, Kochi, Japan. yoritoy@med.kochi-u.ac.jp OBJECTIVE: To investigate the macrophage response in endometriosis by determining the expression and localization of human leukocyte antigen (HLA)-ABC and HLA-DR by the peritoneal fluid (PF) macrophages and PF concentrations of interferon (IFN)-gamma that regulate HLA expression. DESIGN: Case-control study. SETTING: University hospital. PATIENT(S): 64 Japanese endometriosis patients, and 65 women with other laparoscopic diagnoses. INTERVENTION(S): Venipuncture and laparoscopic peritoneal fluid collection. MAIN OUTCOME MEASURE(S): Expression and localization of HLA-ABC and HLA-DR in PF macrophages were determined by flow cytometry and confocal microscopy. The concentration of IFN-gamma in PF was determined by enzyme-linked immunosorbent assay. RESULT(S): In women with endometriosis, expression of HLA-ABC and HLA-DR by PF macrophages, and the IFN-gamma concentrations in PF were statistically significantly lower than in controls. Women with endometriosis showed a statistically significant positive correlation between HLA expression and IFN-gamma concentration. By confocal microscopy, HLA-ABC was distributed homogenously on the macrophage surface whereas HLA-DR expression on these cells corresponded to the lipid raft. CONCLUSION(S): In women with endometriosis, low HLA expression and particularly reduced HLA-DR in the lipid raft may be influenced by low IFN-gamma and may compromise antigen presentation, limiting the immune response to peritoneal cavity antigens such as implanted or metaplastic endometrial tissue. Published 14 January 2008 in Fertil Steril, 89(1): 52-9.
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