Altered Frequencies of CD4^+ CD25^+ Foxp3^+ and CD8^+ CD25^+ Foxp3^+ Regulatory T Cells in Preeclampsia

Regulatory T cells are of utmost importance for tolerating the fetus. In some pregnancy complications such as pre-eclampsia, the frequency of CD4+CD25+Foxp3+ regulatory T cells is altered, but there is no consistency regarding the results. Besides, little is known about the frequency of CD8+CD25+Foxp3+ Treg cells in pregnancy complications. Therefore, we aimed to investigate the frequency of both CD4+ and CD8+ regulatory T cells in the peripheral blood of women afflicted by preeclampsia. Ten non-pregnant, ten healthy pregnant, and ten preeclamptic women participated in this study. Four colors flow cytometry method was used to identify the frequency of the CD4+ and CD8+ regulatory T cells in the peripheral blood. Results indicated that the frequencies of CD4+CD25+Foxp3+ and CD8+CD25+Foxp3+ cells were significantly lower in preeclamptic women compared to healthy pregnant and non- pregnant ones (p 0.05). A positive correlation was also observed between CD4+ and CD8+ regulatory T cells (R=0.532, p=0.002). Moreover, CD4+ regulatory T cells negatively correlated with systolic and diastolic blood pressures (R=-0.760 and -0.753, respectively; p 0.001). CD8+ regulatory T cells also had a negative correlation with systolic (R=-0.503, p=0.001) and diastolic (R=-0.590, p=0.005) blood pressures. In conclusion, a reduction in the frequencies of both CD4+ CD25+ Foxp3+ and CD8+CD25+Foxp3+ regulatory T cells might be important in the pathogenesis of pre- eclampsia.