Expression of the antiviral protein Mx in peripheral blood mononuclear cells of pregnant and bred, non-pregnant ewes

Interferon-tau (IFN tau) acts locally on the endometrium to suppress estrogen and oxytocin receptor expression and block luteolysis in ruminants. Systemic administration of conceptus homogenates or recombinant ovine IFN tau does not block luteolysis or enhance pregnancy rates in sheep or cattle, res...

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Published in:	Journal of endocrinology Vol. 170; no. 2; pp. R7 - 11
Main Authors:	Yankey, SJ, Hicks, BA, Carnahan, KG, Assiri, AM, Sinor, SJ, Kodali, K, Stellflug, JN, Ott, TL
Format:	Journal Article
Language:	English
Published:	Colchester BioScientifica 01-08-2001 Portland Press
Subjects:	Animals Biological and medical sciences Blotting, Northern Blotting, Western Female Fundamental and applied biological sciences. Psychology Gestational Age GTP-Binding Proteins Insemination, Artificial Interferon Type I - physiology Leukocytes, Mononuclear - metabolism Luminescent Measurements Mother. Fetoplacental unit. Mammary gland. Milk Myxovirus Resistance Proteins Pregnancy Pregnancy Proteins - physiology Pregnancy, Animal - immunology Pregnancy. Parturition. Lactation Proteins - genetics Proteins - metabolism RNA, Messenger - analysis Sheep - immunology Vertebrates: reproduction Pregnancy Blood cell Vertebrata Mammalia Mononuclear cell Sheep Self non self recognition Artiodactyla Gene expression Interferon tau Ungulata
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Summary:	Interferon-tau (IFN tau) acts locally on the endometrium to suppress estrogen and oxytocin receptor expression and block luteolysis in ruminants. Systemic administration of conceptus homogenates or recombinant ovine IFN tau does not block luteolysis or enhance pregnancy rates in sheep or cattle, respectively. However, IFN tau up-regulates expression of the antiviral protein Mx throughout the entire uterine wall during early pregnancy. These studies determined if conceptus-derived IFN tau also up-regulates Mx expression in components of the circulating immune system that migrate through the endometrial wall. In experiment one, peripheral blood mononuclear cells (PBMC) were isolated from ewes at D26 post-artificial insemination (AI) and Mx mRNA levels examined by Northern and slot-blot hybridization. Pregnancy resulted in a two-fold increase in Mx mRNA levels compared to bred, non-pregnant ewes at D26. In experiment two, PBMC were isolated from ewes at AI, and every three days from D9 to D30. Results showed a four-fold increase in Mx mRNA levels in PBMC from pregnant versus bred, non-pregnant ewes at D15. Increased Mx mRNA, which remained elevated through D30, was accompanied by increased levels of Mx protein. These results show that pregnancy recognition signaling rapidly induces Mx gene expression in PBMC, and are the first to suggest that IFN tau activates gene expression in components of the circulating immune system.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0022-0795 1479-6805
DOI:	10.1677/joe.0.170r007