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细胞免疫在移植物排斥中有重要作用,虽然妊娠时细胞免疫一般不降低,但母亲不能产生对其同种异体胎儿的细胞免疫。甚至已确证母亲对其父方抗原产生细胞免疫时,常仍不能排除宫内胎儿,相反胚胎组织在子宫外种植时很易被排斥,这提示正常发育的胎儿胎盘单位可抵抗免疫排斥或子宫本身有保护作用。实验证实由于直接围绕胎儿的滋养层
Cellular immunity plays an important role in graft rejection. Although cellular immunity generally does not decrease during pregnancy, mothers can not produce cellular immunity to their allogeneic fetuses. It has often been ruled out that intrauterine fetuses can not be ruled out even when mothers are immunized against their paternal antigens, whereas embryo tissues are easily rejected when they are grown extrauterine, suggesting that normally developing placental units may resist immune rejection or the uterus itself Protective effects. Experiments confirmed that due to the trophoblast directly around the fetus