Expression of uteroglobin in the human endometrium

• Published in: Molecular human reproduction Vol. 5; no. 12; pp. 1155 - 1161
• Main Authors: Müller-Schöttle, Frank, Classen-Linke, Irmgard, Alfer, Joachim, Krusche, Claudia, Beier-Hellwig, Karin, Sterzik, Karl, Beier, Henning M.
• Format: Journal Article
• Language: English
• Published: Oxford Oxford University Press 01.12.1999; Oxford Publishing Limited (England)
• Subjects: Biological and medical sciences; CC10; CC16; Endometrium - cytology; Endometrium - physiology; Enzyme-Linked Immunosorbent Assay; Epithelial Cells - metabolism; Female; Fundamental and applied biological sciences. Psychology; Gene expression; human endometrium; Humans; Immunohistochemistry; menstrual cycle; Menstrual Cycle - physiology; Molecular and cellular biology; Molecular genetics; Reverse Transcriptase Polymerase Chain Reaction; uteroglobin; Uteroglobin - genetics; Uteroglobin - metabolism; Human; Globin; Immunohistochemistry; Progesterone binding protein; Messenger RNA; Uterus; Menstrual cycle; Female genital system; Gene expression; Woman; ELISA assay; Endometrium
• ISSN: 1360-9947; 1460-2407; 1460-2407
• DOI: 10.1093/molehr/5.12.1155

Uteroglobin is a progesterone binding protein, a member of the antiflammin gene family and possibly a novel cytokine. Initially, uteroglobin was identified as the major protein of rabbit uterine secretion during the phase of preimplantation. Counterparts of the rabbit uteroglobin or its gene are described in rat, mouse, hamster, hare, pig, horse and human. While uteroglobin appears as one of the most extensively studied proteins, particularly its physico–chemical properties, including its crystal structure and its gene, the true physiological role of this protein still remains to be unravelled. Essential to understanding the significance of human uteroglobin in reproductive organs, particularly in the endometrium, is a knowledge of the spatial and chronological expression of this secretory protein. Our studies on 115 volunteers combined reverse transcription–polymerase chain reaction (RT–PCR), immunohistochemistry and quantitative assessment by an enzyme-linked immunosorbent assay for uteroglobin. The expression, localization and release of uteroglobulin in the human endometrium are presented. Secretory uteroglobin is found in endometrial tissue homogenates in highest levels of expression during the early luteal phase (days 15–19, 340 pg/mg total protein). In turn, uteroglobin is released into the uterine lumen in peak amounts during the receptive phase of the menstrual cycle (mid-luteal phase, days 20–23, secretion level 833.4 pg/mg total protein). Our immunohistochemical studies match with these results, as uteroglobin is located during the early and mid-luteal phase in the apical compartments of endometrial gland cells. These observations strongly suggest an involvement of uteroglobin in endometrial preparations for implantation.