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1 November 2001 Pregnancy and Interferon-τ Upregulate Gene Expression of Members of the 1-8 Family in the Bovine Uterus
James K. Pru, Kathy J. Austin, Arthur L. Haas, Thomas R. Hansen
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The 1-8 family (1-8U, 1-8D, Leu-13/9-27) of interferon (IFN)-inducible genes encodes proteins that are components of multimeric complexes involved with transduction of antiproliferative and homotypic adhesion signals. Human 1-8 family members are highly similar and are regulated by type 1 and type 2 IFNs. Because the bovine uterus is bathed in conceptus-derived IFNτ during early pregnancy, it was hypothesized that members of the 1-8 family were upregulated in the bovine uterus during early pregnancy. Oligonucleotide primers were designed based on human and rat 1-8U and Leu-13 cDNAs and used in reverse transcription polymerase chain reactions to amplify bovine cDNAs from endometrial RNA. The bovine 1-8U cDNA was sequenced, found to be 84% identical to the human 1-8U, and used to screen a bovine endometrial cDNA library to isolate the full-length 1-8U and Leu-13 cDNAs. The inferred amino acid sequences of bovine 1-8U and Leu-13 were 72% and 73% identical to their respective human counterparts. Bovine 1-8U and Leu-13 retain an amino acid motif that is conserved in other 1-8 family members and in some ubiquitin-conjugating enzymes (E2s). This motif is critical for function of E2s in covalently linking ubiquitin to targeted proteins. Northern blotting revealed that bovine endometrial 1-8U and Leu-13 mRNAs were upregulated on Day 15 of pregnancy (P < 0.0001) and continued to accumulate through Day 18 of pregnancy (P < 0.05) when compared with endometrium from nonpregnant cows. The bovine 1-8U and Leu-13 mRNAs were also upregulated (P < 0.05) by IFNτ (25 nM) within 3 h, continued to accumulate through 12 h, and reached a plateau at 12–24 h in cultured bovine endometrial cells. In situ hybridization revealed that mRNAs encoding 1-8 family members were heavily localized to glandular epithelium but also were present to a lesser extent in the luminal epithelium and stroma. The temporal upregulation of 1-8U and Leu-13 mRNAs by pregnancy and IFNτ and tissue distribution of these mRNAs paralleled closely that of the ubiquitin homolog, IFN-stimulated gene product 17. These IFN-induced proteins probably work together to prepare the endometrium for adhesion of the developing conceptus.

James K. Pru, Kathy J. Austin, Arthur L. Haas, and Thomas R. Hansen "Pregnancy and Interferon-τ Upregulate Gene Expression of Members of the 1-8 Family in the Bovine Uterus," Biology of Reproduction 65(5), 1471-1480, (1 November 2001).
Published: 1 November 2001

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