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Human Reproduction, Vol 12, 2102-2107, Copyright © 1997 by Oxford University Press

ARTICLES

Splenocytes in early pregnancy promote embryo implantation by regulating endometrial differentiation in mice

K Takabatake, H Fujiwara, Y Goto, T Nakayama, T Higuchi, J Fujita, M Maeda and T Mori
Department of Gynecology and Obstetrics, Faculty of Medicine, Kyoto University, Japan.

We have reported that i.v. administration of splenocytes prepared from early pregnant mice promoted embryo implantation in pseudopregnant CD-1 (ICR) (closed colony) mice. In this study, the similar effects of splenocytes were confirmed using an inbred strain, BALB/c mice, and the mechanism was further investigated. Splenocytes were prepared from pregnancy day 4 (P4-spl) and dioestrus mice (Di-spl), and supernatant of P4-spl suspension (P4-sup) was used as controls. On pseudopregnancy day 2, splenocytes or supernatant were injected into caudal vein or endometrial stroma of the recipient mice, and blastocysts were transferred into the endometrial lumen. In both BALB/c and ICR strains, the implantation rates per recipient with i.v. and intraendometrial injection were significantly higher in P4-spl groups. Then, ICR mice were oophorectomized on pseudopregnancy day 3. After 3 day progesterone supplementation, blastocysts were transferred with i.v. injection of P4- spl and P4-sup, or s.c. oestradiol injection. Under progesterone supplementation, successful implantations were observed in the P4-spl- and oestradiol-treated groups, but not in P4-sup-treated group. Reverse transcriptase-polymerase chain reaction analysis revealed that messenger RNA expression of leukaemia inhibitory factor in the uterus was induced by P4-spl and oestradiol, but not by P4-sup. These findings showed that splenocytes of early pregnant mice promote embryo implantation by regulating endometrial differentiation.
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