[Immunopathomorphology of the human placental barrier in the first trimester of pregnancy complicated by the inflammation of the birth-ways].

The effect of ascending infection of birth-ways on transport of maternal immunoglobulins (Igs) through the placental barrier in humans during the first trimester of pregnancy was studied. The transport of Igs is seen already in 3.5-to 5-week-old embryos, and different cellular and biochemical compounds participate at each stage of this process. Transport of Igs through the trophoblast is carried out due to the secretory component (SC) and, perhaps, to some other receptors. Monocytes together with Igs penetrate into capillaries between the endothelial cells and are transported with the blood all over the body. It seems that SC and other receptors help Igs to penetrate into capillaries through the endothelium. Further, Igs are transported with erythroblasts. In the development without infection the transport of IgG was seen in all cases studied. Inflammation of the birth-ways is accompanied by an increase in transport of all Igs, already in early embryogenesis. Three groups were distinguished: 1) abortions without inflammation; 2) cases with signs of moderate inflammation (endometritis, deciduitis); 3) cases with intensive inflammation with necrosis and leucocytic infiltration. Transport of Igs was seen in 77.8% cases of the first group and in all cases of groups 2 and 3. Transport of IgM was not found in the first group, but was seen in 50% cases of group 2 and 66.7% of group 3.