Yamamoto T, Takahashi Y, Kase N, Mori H. Proportion of CD56+ 3+ T cells in decidual and peripheral lymphocytes of normal pregnancy and spontaneous abortion with and without history of recurrent abortion. AJRI 1999; 42:355–360 © Munksgaard, Copenhagen
PROBLEM: The present study investigated the proportion of CD56+ 3+ T cells in maternal peripheral and decidual lymphocytes in normal pregnancy and spontaneous abortion with and without history of recurrent spontaneous abortion (RSA).
METHOD OF STUDY: Maternal peripheral blood and decidua were taken from normal pregnancies and missed abortions with and without RSA. Decidual lymphocytes were prepared from decidual tissue and analyzed by flow cytometry.
RESULTS: In normal pregnancy, the percentages of CD56+ 3+ T cells in decidual lymphocytes did not differ from those in the peripheral blood. However, the proportion of CD56+ 3+ T cells in decidual CD3+ T cells increased higher than that in the peripheral CD3+ T cells. The percentages of decidual CD56+ 3+ T cells in missed abortions with and without RSA were lower than those in normal pregnancies.
CONCLUSION: CD56+ 3+ T cells may play a role in the maintenance of pregnancy. The phenomenon, where the proportion of CD56+ 3+ T cells in decidual lymphocytes decreases, may be due to an immunologic event leading to missed abortion.