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United States Department of Agriculture

Agricultural Research Service

Title: Expression of Interferon Gamma-Inducible Protein 10 Kda in the Uterine Endometrium of Pregnant Ewes

Authors
item Nagaoka, Kentaro - UNIV TOKYO, JAPAN
item Sakai, Akiharu - UNIV TOKYO, JAPAN
item Nojima, Hisashi - UNIV TOKYO, JAPAN
item Christenson, Ronald
item Imakawa, Kazuhiko - UNIV TOKYO, JAPAN
item Sakai, Senkiti - UNIV TOKYO, JAPAN

Submitted to: Biology of Reproduction Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: March 30, 2001
Publication Date: December 20, 2001
Citation: Nagaoka, K., Sakai, A., Nojima, H., Christenson, R.K., Imakawa, K., Sakai, S. 2001. Expression of interferon gamma-inducible protein 10 kDa in the uterine endometrium of pregnant ewes [abstract]. Biology of Reproduction. 64 (Supplement 1):187-188. (Abstract # 207)

Technical Abstract: For the establishment and maintenance of pregnancy, the conceptus needs to escape from the maternal immune system. Distribution of immune cells within the uterus, which is regulated by steroid hormones, cytokines and chemokines, changes during peri-implantation periods. From numerous cDNA subtraction studies between day 14 pregnant and non-pregnant uteri, interferon gamma-inducible protein 10 kDa (IP-10) was identified. This factor belongs to a member of C-X-C chemokines and chemotactic agent for activated T lymphocytes. Although this chemokine is regulated by Type II interferon, IFN-gamma, expression of IP-10 at the endometrium seems to parallel the production of conceptus Type I IFN, IFN-tau. In the present study, therefore, we investigated the relationships between IP-10 and IFN-gamma and IFN-tau. Using Northern blot analysis, we observed that the expression of IP-10 mRNA, detected only in the pregnant uterus, increased as peri-implantation period proceeds. Using RT-PCR, we detected that the expression of endometrial IFN-gamma mRNA also increased during the same period. Immunohistochemical analysis revealed that both IP-10 and IFN- gamma peptides were localized in the epithelial cells and sub-epithelial stroma cells of pregnant uterus whereas IFN-gamma, not IP-10, was also localized in cyclic ewes. In addition, IFN-tau peptide was localized in trophoblast cells and uterine epithelial cells in the pregnant ewes. Furthermore, T lymphocytes, CD4**+ and CD8**+ cells, were found in sub- epithelial stroma of uteri of pregnant ewes. These results suggest that IP-10, regulated by IFN-gamma and(or) IFN-tau, may play a role in the recruitment of T lymphocytes to the uterine endometrium during peri-implantation periods.

Last Modified: 9/23/2014
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