Human leukocyte antigen-G, a ligand for the natural killer receptor KIR2DL4, is expressed by eutopic endometrium only in the menstrual phase

• Published in: Fertility and sterility Vol. 91; no. 2; pp. 343 - 349
• Main Authors: Kawashima, Masaaki, M.D, Maeda, Nagamasa, M.D, Adachi, Yoshihiro, M.D, Takeuchi, Tamotsu, M.D, Yamamoto, Yorito, M.D, Izumiya, Chiaki, M.D, Hayashi, Kazutoshi, M.D, Furihata, Mutsuo, M.D, Udaka, Keiko, M.D, Fukaya, Takao, M.D
• Format: Journal Article
• Language: English
• Published: New York, NY Elsevier Inc 01.02.2009; Elsevier
• Subjects: Adult; Ascitic Fluid - immunology; Biological and medical sciences; Case-Control Studies; Endometriosis; Endometriosis - immunology; Endometriosis - physiopathology; Endometriosis - surgery; Endometrium - immunology; Endometrium - physiopathology; Endometrium - surgery; eutopic endometrium; Female; Female genital diseases; Flow Cytometry; Gynecology. Andrology. Obstetrics; Histocompatibility Antigens Class I - analysis; HLA Antigens - analysis; HLA-G Antigens; human leukocyte antigen-G; Humans; Hysterectomy; Immunohistochemistry; Internal Medicine; Japan; Killer Cells, Natural - immunology; killer immunoglobulin-like receptor; Medical sciences; Menstrual Cycle - immunology; Middle Aged; natural killer cell; Non tumoral diseases; Obstetrics and Gynecology; Receptors, KIR2DL4 - analysis; retrograde menstruation; Japan; retrograde menstruation; Endometriosis; human leukocyte antigen-G; eutopic endometrium; natural killer cell; killer immunoglobulin-like receptor; HLA-System; Immunoglobulins; Menstruation; Ligand; Gynecology; Retrograde; Obstetrics; Female genital diseases; Natural killer cell; Uterine diseases; Endometrium
• ISSN: 0015-0282; 1556-5653
• DOI: 10.1016/j.fertnstert.2007.12.005

Objective To investigate menstrual cycle changes in expression by eutopic endometrium of a nonclassic human leukocyte antigen, HLA-G, which binds to the killer immunoglobulin-like receptor (KIR) 2DL4 (CD158d) on natural killer (NK) cells. Such antigens have been linked to endometriosis. Design Case-control study. Setting University hospital. Patient(s) We examined 20 Japanese women undergoing hysterectomy for endometriosis and 17 undergoing hysterectomy for myoma. Intervention(s) Immunohistochemical HLA-G staining of eutopic endometrium and peritoneal fluid (PF) cells from women with and without endometriosis. Flow cytometric analysis of PF NK cells from women with and without endometriosis. Main Outcome Measure(s) HLA-G staining in eutopic endometrium was quantified by image analysis. The KIR2DL4-expressing NK cells in PF were investigated by flow cytometry. Result(s) The HLA-G was expressed by eutopic endometrium only in the menstrual phase and not in the late proliferative or secretory endometrium. Intensity of HLA-G staining did not differ significantly between women with and without endometriosis. The HLA-G- expressing cells were detected in PF during the menstrual period. These cells are morphologically and flow cytometrically different from mesothelial cells and NK cells. Conclusion(s) The HLA-G expression is observed in eutopic endometrium only during the menstrual phase, and no differences were observed between women with and without endometriosis. Epithelial cells bearing HLA-G may enter the peritoneal cavity during retrograde menstruation, allowing the antigen to react locally with KIR2DL4.