妊娠高血压综合征患者外周血与脐血血小板蛋白激酶C活性变化的研究

The Study on the Activity of Protein Kinase C in Platelets of Maternal Vein and Umbilical Blood in Pregnancy Induced Hypertension Syndrome Patients

目的 探讨不同程度妊娠高血压综合征 (简称妊高征 )患者血小板蛋白激酶 C(PKC)活性变化与妊高征病情程度及胎儿宫内生长受限 (FGR)之间的关系。 方法 底物蛋白磷酸化法检测35例妊高征患者及正常孕妇外周血和新生儿脐血血小板细胞膜和细胞浆的 PKC活性。 结果 无论外周血还是脐血 ,轻度妊高征患者血小板的细胞膜及细胞浆 PKC活性与正常妊娠组相比无明显差异。中度及重度妊高征患者血小板的细胞膜及细胞浆 PKC活性显著高于正常妊娠组 [(4 6± 6与 37±4) pmol/ (min· mg protein) ,P<0 .0 1];正常妊娠组血小板的细胞膜及细胞浆活性无明显差异。中度及重度妊高征患者血小板的细胞膜 PKC活性显著高于细胞浆且随病情加重而逐渐明显 [(16± 4与12 .8± 2 .7) pmol/ (min· mg protein) ,P<0 .0 5 ],中、重度妊高征患者合并 FGR组血小板细胞膜的PKC活性均明显高于中、重度妊高征患者非合并 FGR者 [(4 8± 8与 40± 7) pmol/ (m in· mgprotein) ,P<0 .0 1,(4 6± 10与 39± 6 ) pmol/ (min· m g protein) ,P<0 .0 1]。 结论 中度及重度妊高征患者外周血及脐血中血小板 PKC存在异常活化状态 ,其异常活化程度随妊高征病情加重而增高 ;血小板 PKC异常活化可能介导

Objective To investigate the relationship among the activity of protein kinase C (PKC) in platelets of maternal vein and umbilical blood , the pathophysiological changes of pregnancy induced hypertension (PIH) and fetal growth restriction (FGR) in PIH patients. Methods Activities of PKC in membrane and plasma of platelets from maternal vein and umbilical blood taken from 35 PIH patients and 20 normal pregnant women were measured with substrate phosphorylation method. Results No difference was shown in the PKC activities between the mild PIH patients and normal pregnant women in both maternal and cord blood.The PKC activities in moderate and severe PIH patients were significantly higher than those of the normal pregnant group.In normal pregnant women, the PKC activity in membrane and plasm of the platelets had no significant difference. In the moderate and severe PIH group, PKC activity in membrane was far more higher than the plasm 46±6 vs 37±4 pmol/(min·mg protein), P<0.01, 16±4 vs 12.8±2.7 pmol/(min·mg protein ),P<0.05). The PKC activities in platelets membrane from the moderate and severe PIH patients complicating with FGR was higher than that of PIH without FGR.48±8 vs 40±7 pmol/(min·mg protein), P<0.01,46±10 vs 39±6 pmol/(min·mgprotein), P<0.01. Conclusion There are abnormal activity PKC in platelets of peripheral and umbilical blood in the moderate and severe PIH patients; the elevated activity of PKC in platelets in the moderate and severe PIH patients may be related to the severity of the disease; Abnormal activation of PKC in platelets may be involved in the onset and development of fetal growth restriction (FGR).