title: Identification of genes in the ovine endometrium regulated by interferon tau independent of signal transducer and activator of transcription 1.
abstract: Interferon tau (IFNtau), a type I IFN produced by the conceptus trophectoderm, increases many type I IFN-stimulated genes (ISGs) in the ovine uterine endometrial stroma and glandular epithelium (GE) using signal transducer and activator of transcription 1 (STAT1)-dependent pathways. Most ISGs are not induced or increased by IFNtau in the STAT1-negative endometrial luminal epithelium (LE). The objective was to identify genes regulated by IFNtau in a STAT1-independent manner using DNA microarray and human cell lines. The RNA from human 2fTGH and U3A (STAT1 null 2fTGH) cell lines, stimulated for 24 h with nothing or recombinant ovine IFNtau, was profiled using an Affymetrix human genome U95Av2 microarray. In 2fTGH cells, IFNtau increased the expression of 101 genes at least 2-fold, including IFN-inducible 56-kDa protein (IFI56), ISG12 or p27, and guanylate binding protein isoform I (GBP-2). In U3A cells, IFNtau increased expression of 66 genes at least 2-fold, including Wnt7a. Steady-state levels of IFI56, ISG12, GBP-2, and Wnt7a mRNAs increased in the ovine uterine endometrium between d 10 and 16 of pregnancy but not during the estrous cycle. GBP-2 and IFI56 mRNAs were expressed only in endometrial stroma, ISG12 in both LE and GE, and Wnt7a only in LE of the ovine uterus. Intrauterine infusion of ovine IFNtau increased expression of all four genes in the endometrium of cyclic ewes. Therefore, IFNtau does regulate genes independent of STAT1 in the endometrial LE and U3A cells and dependent on STAT1 in the endometrial stroma and 2fTGH cells. These IFNtau -stimulated genes may be important in establishment of uterine receptivity to the embryo and conceptus implantation given their stage-specificity in endometrium across diverse species.
authors.affiliation: Center for Animal Biotechnology and Genomics, 442 Kleberg Center, 2471 TAMU, Texas A&M University, College Station, Texas 77843-2471, USA. tspencer@tamu.edu.
authors.forename: Seokwoon
authors.initials: S
authors.lastname: Kim
authors.forename: Youngsok
authors.initials: Y
authors.lastname: Choi
authors.forename: Fuller W
authors.initials: FW
authors.lastname: Bazer
authors.forename: Thomas E
authors.initials: TE
authors.lastname: Spencer
mesh_terms: D048868:Adaptor Proteins, Signal Transducing; D000818:Animals; D002352:Carrier Proteins / Q000235:genetics; D002460:Cell Line; D004268:DNA-Binding Proteins / Q000235:genetics* / Q000378:metabolism; D004717:Endometrium / Q000502:physiology*; D005260:Female; D005786:Gene Expression Regulation / Q000187:drug effects / Q000502:physiology*; D007370:Interferon Type I / Q000494:pharmacology / Q000502:physiology*; D037102:Lectins; D008565:Membrane Proteins; D020411:Oligonucleotide Array Sequence Analysis; D011257:Pregnancy Proteins / Q000494:pharmacology / Q000502:physiology*; D011506:Proteins / Q000235:genetics; D011518:Proto-Oncogene Proteins; D012333:RNA, Messenger / Q000378:metabolism; D016601:RNA-Binding Proteins; D050794:STAT1 Transcription Factor; D012756:Sheep; D015398:Signal Transduction / Q000502:physiology*; D015534:Trans-Activators / Q000235:genetics* / Q000378:metabolism; D051153:Wnt Proteins
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D002352:Carrier Proteins; D004268:DNA-Binding Proteins; C406887:IFI27 protein, human; C484290:IFIT1 protein, human; D007370:Interferon Type I; D037102:Lectins; D008565:Membrane Proteins; D011257:Pregnancy Proteins; D011506:Proteins; D011518:Proto-Oncogene Proteins; D012333:RNA, Messenger; D016601:RNA-Binding Proteins; D050794:STAT1 Transcription Factor; D015534:Trans-Activators; D051153:Wnt Proteins; C490508:Wnt7a protein, mouse; C037937:glucan-binding proteins; C020947:interferon tau