孕妇外周血及胎盘组织中胎儿有核红细胞出现频率与胎儿生长受限

Number of Fetal Nucleated Red Blood Cell in Maternal Blood and Placenta in Pregnancies with Intrauterine Growth Retardation

目的 探讨孕妇外周血及胎盘组织中胎儿有核红细胞 (nucleated red blood cell,NRBC)的出现频率与胎儿生长受限 (fetal growth restriction,FGR)的关系。 方法 对 2 0例孕 2 8～36周 ,年龄 2 1～ 30岁 (包括 9例 FGR)的孕妇外周血进行不连续密度梯度离心 ,对分离后的细胞进行制片 ,显微镜下进行 NRBC计数 ,比较组间差异 ;追随至终止妊娠时 ,对胎盘组织进行切片 ,显微镜下进行 NRBC计数 ,比较组间差异 ;显微操作法获取 5例单个 NRBC行引物延伸预扩增 (PEP)和聚合酶链反应 (PCR) ,验证其胎儿细胞来源。 结果 9例 FGR妊娠妇女外周血中 NRBC数目从 12个 / 7ml～ 4 0个 / 7ml不等 ,平均为 2 2 .6个 / 7m l。而同孕龄正常妊娠妇女外周血中 NRBC数目从 0个 / 7ml～ 10个 / 7ml不等 ,平均为 5 .4个 / 7ml,两者间差异有极显著性 (P<0 .0 0 1) ;FGR妊娠妇女胎盘绒毛间质血管中 NRBC数目从 2个 / 2 0 HP～ 5个 / 2 0 HP不等 ,平均为 2 .8个 / 2 0 HP。而正常妊娠妇女则从 0个 / 2 0 HP～ 2个 / 2 0 HP不等 ,平均为 0 .6个 / 2 0 HP,两者间差异有显著性 (P<0 .0 5 )。 结论 FGR妊娠妇女其外周血与胎盘组织中

Objective To examine the number of fetal nucleated red blood cell (NRBC) in maternal blood and placenta tissue in fetal growth restriction(FGR) pregnancies. Methods 20 women of 28-36 weeks' gestation at age of 21~30(including 9 FGR pregnancies)were chosen. Fetal cells were isolated from maternal blood with discontinuous density gradient centrifugation. The isolated cells were made smear and counted under the microscope; After delivery, the placenta tissue were made into sections and also counted under the microscope; To determine the origin of the NRBC , the single NRBC was analysed by primer extension preamplification (PEP) and polymerase chain reaction (PCR). Results The number of NRBC in 9 FGR pregnancy women's peripheral blood ranged from 12/7 ml^40/7 ml,(average 22.6/7 ml). The number of NRBC in the control pregnancies ranged from 0/7 ml^10/7 ml, (average 5.4/7 ml). Significant difference was shown between the two groups; The number of NRBC in 9 FGR pregnancy women's placenta tissue was significantly higher than the median value in the control pregnancies (2.8/20HP compared with 0.6/20HP, P < 0.05). Conclusion The number of NRBC was significantly increased in peripheral blood and placenta tissue in FGR pregnant women.