Temporal Expression of Type I Interferon Receptor in the Peri-Implantation Ovine Extra-Embryonic Membranes: Demonstration that Human IFNα Can Bind to This Receptor

Endocrine Journal

KAZUHIRO TAMURA⁴  SENKITI SAKAI¹  KAZUHIKO IMAKAWA¹  RONALD K CHRISTENSON³  HIROSHI KOGO⁴  RITA S-F LEE²  YONGJIE JI¹ 

[1] Laboratory of Animal Breeding, Faculty of Agriculture, The University of Tokyo;AgResearch, Ruakura Agricultural Research Centre;USDA-ARS, U.S. Meat Animal Research Center;Department of Pharmacology, Tokyo University of Pharmacy and Life Science

关键词: IFNτ;    IFNα;    IFN receptor;    Trophoblast;    Implantation;   

DOI  :  10.1507/endocrj.49.195

学科分类：内分泌与代谢学

来源: Japan Endocrine Society

【 摘 要 】

References(33)Cited-By(21)Interferon-tau (IFNτ), produced by the trophectoderm of ruminant ungulates, binds to the type I IFN receptor (IFNAR) located at the uterine endometrium in a paracrine manner. Since IFNτ attenuates the secretory pattern of an endometrial luteolysin, prostaglandin F2α, IFNτ has been considered as a conceptus factor implicated in the process of maternal recognition of pregnancy. Here we report the presence of IFNAR subunit (IFNAR1) in ovine conceptuses during the period of peri-implantation development and demonstrate that 125I-human (h) IFNα binds to membrane preparations from ovine corpus luteum and conceptus. Using an antibody against hIFNAR1, immunohistochemical analysis revealed that IFNAR1 protein was present in day 14 and 16 conceptuses (day 0=day of estrus) and luminal and glandular epithelia of the endometrium. Conceptus membrane proteins analyzed by western blot with the same antibody displayed immunoreactive bands at 95, 60 and 55 kDa while endometrial membrane proteins showed bands at 200, 95 and 55 kDa. Northern blot analysis revealed that IFNAR1 mRNA was present in days 15-19 conceptuses and day 18-19 allantoic membranes. Receptor binding studies indicated that 125I-hIFNα binding to day 16, but not earlier, conceptus membrane proteins could be displaced with hIFNα or ovine IFNτ. Based on Scatchard analysis, day 16 conceptus membranes contained 28 fmol IFNAR/mg protein with a dissociation constant of 300 pM. Cross-linking experiments demonstrated that 125I-hIFNα-receptor complex migrated at 120 kDa, indicating that the receptor component(s) was approximately 100 kDa. These data provide evidence that although the binding does not occur until day 16, ovine conceptuses possess IFNAR1 near or at the time of implantation, suggesting that IFNτ, a factor produced by the trophectoderm of ruminant ungulates, could act on the conceptus in an autocrine manner. In addition to functioning as an antiluteolytic factor, therefore, IFNτ may have a direct effect on conceptus development.

【 授权许可】

Unknown