妊娠时,在抗原不同的组织间存在着自然免疫监视。虽然对这种与免疫规律不完全符合的机制还不清楚,但有一概念似乎已被肯定,即在绒毛和蜕膜界面的局部免疫调节因素对胎儿的存活是必需的。机体单核细胞对外来细胞的细胞毒作用是重要的免疫防御手段,但胎儿滋养层细胞对细胞溶解作用有抵抗力,这是由于在绒毛-蜕膜界面间存在的胎盘甾类化合物对单核细胞活性有抑制作用。已证实 During pregnancy, there is a natural immune surveillance between different tissues of the antigen. Although this mechanism of incomplete compliance with the immunology is unclear, there seems to be a notion that local immunomodulatory factors at the villi and decidua interface are necessary for the survival of the fetus. The cytotoxic effect of the body’s monocytes on foreign cells is an important immunological defense, but fetal trophoblast cells are resistant to lysis due to the presence of placental steroids at the villi-decidua interface on the mononuclear cells Cell activity inhibition. Confirmed