Abstract
The interferon stimulated gene product, ISG17, conjugates to bovine uterine proteins in response to conceptus-derived interferon (IFN)-τ. The objectives of the present experiments were to examine induction of ISG17 (0.65 kb) and a related 2.5 kb mRNA in response to IFN-τ and pregnancy using Northern blotting procedures, and to determine cell types in the endometrium that expressed ISG17 mRNA usingin situ hybridization. RNA was isolated from endometrial explants or from bovine endometrial (BEND) cells cultured in the absence (control) or presence of 25 nM recombinant (r) bolFN-τ for 0, 3, 6, 12, 24, or 48 h. The major ISG17 0.65 kb mRNA and a minor 2.5 kb mRNA were induced (p<0.05) after 6 h (explants) or 3 h (BEND cells) treatment with rbolFN-τ. Both mRNAs were present in endometrium from day 18 pregnant cows, but were absent in endometrium from nonpregnant cows. The ISG17 mRNA was localized to stromal and glandular epithelial cells on d 18 of pregnancy. The 2.5 kb mRNA may encode a novel ISG17 homolog, or a unique polyISG17 repeat that is similar in structure to the polyubiquitin genes. Because ISG17 mRNA is induced in stromal and glandular epithelial cells, it could be assumed that ISG17 has a role in regulating intracellular proteins in both cell types.
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Johnson, G.A., Austin, K.J., Collins, A.M. et al. Endometrial ISG17 mRNA and a related mRNA are induced by interferon-tau and localized to glandular epithelial and stromal cells from pregnant cows. Endocr 10, 243–252 (1999). https://doi.org/10.1007/BF02738623
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DOI: https://doi.org/10.1007/BF02738623