IMR Press / CEOG / Volume 45 / Issue 1 / DOI: 10.12891/ceog4381.2018

Clinical and Experimental Obstetrics & Gynecology (CEOG) is published by IMR Press from Volume 47 Issue 1 (2020). Previous articles were published by another publisher on a subscription basis, and they are hosted by IMR Press on as a courtesy and upon agreement with S.O.G.

Editorial Article
Improving the chance of successful implantation – part 2 – Circumventing immune rejection and the fetal semi-allograft
J.H. Check1, 2, *J. Aly1
Show Less
1 Department of Obstetrics and Gynecology, Division of Reproductive Endocrinology & Infertility, Cooper Medical School of Rowan University, Camden, NJ, USA
2 Cooper Institute for Reproductive and Hormonal Disorders, P.C., Mt. Laurel, NJ, USA
Clin. Exp. Obstet. Gynecol. 2018, 45(1), 9–13;
Published: 10 February 2018

Purpose: To review possible mechanisms of how the fetal semi-allograft avoids immune rejection. Based on these mechanisms potential therapies to improve implantation by suppressing immune rejection are discussed. Materials and Methods: Studies supporting the importance of attaining T suppressor (sup) cells to the maternal fetal interface, while decreasing TH 17 cells along with causing a shift from cellular immunity to humoral immunity by causing a shift of influence from TH1 to TH2 cytokines is presented. Also discussed is the importance of suppressing the ability of natural killer cells to attack the fetal semi-allograft related to the secretion of an immuno-immunomodulatory protein known as the progesterone induced blocking factor (PIBF). Results: Progesterone supplementation in the luteal phase, possibly by causing the production especially of intracellular PIBF, may be the most important therapy to improve embryo implantation by suppressing immune rejection. Other potential therapies include human chorionic gonadotropin (hCG) supplementation and lymphocyte immunotherapy. Conclusions: Knowledge of the mechanism by which the fetal semi-allograft escapes immune surveillance should lead to more novel therapies to improve embryo implantation.
Immune surveillance
T suppressor cells
TH17 cells
Natural killer cells
Progesterone induced blocking factor
Back to top