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BioMed Research International
Volume 2013 (2013), Article ID 182531, 7 pages
Research Article

Ovarian Stimulation Affects the Population of Mouse Uterine NK Cells at Early Pregnancy

1Anatomy Department, Tarbiat Modares University, P.O. Box 14115-111, Tehran, Iran
2Immunology Department, Tarbiat Modares University, Tehran, Iran

Received 28 August 2013; Accepted 27 October 2013

Academic Editor: Kotaro Kitaya

Copyright © 2013 Parvin Dorfeshan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The aim of this study was to determine the influence of ovarian stimulation on endometrial mouse NK cell population. For superovulation, the female adult NMRI mice were injected i.p. with 10 IU of the pregnant mare serum gonadotropin followed 48 h later by an i.p. injection of 10 IU human chorionic gonadotropin hormone. Ovarian stimulated and nonstimulated mice were mated with fertile male. The presence of vaginal plug proved natural pregnancy, and this day was considered as day one of pregnancy. Tissue samples were prepared from the uterine horn and spleen of both groups of study on 7th day of pregnancy. Serum estradiol-17 and progesterone were measured at the same time. The tissue cryosections were prepared and double stained for CD 161 and CD3 markers, and NK cells population was analyzed. Relative frequency of NK cells was significantly lower in stroma and myometrium in hyperstimulated mice compared with the control group. However, no difference was seen in percentage of NK cells in spleen. The ovarian stimulation influences the proportion of uterine NK cells and may affect the embryo implantation.