子痫前期患者胎盘和脐动脉组织Rho相关蛋白激酶Ⅱ的表达及意义

目的 探讨子痫前期患者胎盘和脐动脉组织中Rho相关蛋白激酶Ⅱ(RockⅡ)的表达变化及其意义.方法 采用RT-PCR、蛋白印迹法分别检测35例轻度子痫前期患者(轻度子痫前期组)、38例重度子痫前期患者(重度子痫前期组)及45例正常晚期妊娠妇女(对照组)胎盘及脐动脉组织中RockⅡmRNA及其蛋白表达水平;采用免疫组化方法 对RockⅡ在胎盘组织中的表达进行定位,B超检测脐动脉收缩期最大血流速度(S)与舒张末期血流速度(D)的比值.结果 (1)RockⅡ主要表达于胎盘合体滋养细胞的细胞质.(2)轻度子痫前期组、重度子痫前期组及对照组胎盘组织RockⅡmRNA表达水平分别为0.82±0.14、0.93±0.13及0.70 4-0.12,分别比较,差异也均有统计学意义(P＜0.01);轻度子痫前期组、重度子痫前期组及对照组胎盘组织RockⅡ蛋白表达水平分别为0.79±O.15、0.92±0.12及0.68±0.11,分别比较,差异也均有统计学意义(P＜0.01).(3)轻度子痫前期组、重度子痫前期组及对照组脐动脉组织RockⅡmRNA表达水平分别为0.69±0.13、0.55±0.12及0.76±0.10,分别比较,差异也均有统计学意义(P＜0.01);轻度子痫前期组、重度子痫前期组及对照组脐动脉组织RockⅡ蛋白表达水平分别为0.68±0.10、0.51±0.12及0.75±0.13,分别比较,差异也均有统计学意义(P＜0.01).(4)脐动脉组织RockⅡmRNA及蛋白表达水平与脐动脉S/D值均无相关性(P＞0.05).结论 RockⅡ在子痫前期患者胎盘组织中的表达水平升高,在脐动脉组织中的表达水平降低,可能参与了子痫前期的病理、生理过程.

Expression and significance of Rho-associated protein kinase II in preeclamptic placenta and umbilical artery

OBJECTIVE: To investigate the expression and significance of Rho-associated protein kinase II (Rock II) in preeclamptic placenta and umbilical artery. METHODS: Semiquantitative RT-PCR and Western blot were used to investigate the expression of Rock II mRNA and Rock II protein in placenta and umbilical artery from 35 women with moderate preeclampsia (MPE group), 38 women with severe preeclampsia (SPE group) and 45 normal third trimester pregnant women (control group), the S/D value of umbilical artery was examined by ultrasound. RESULTS: (1) The expression of Rock II mRNA of placenta in MPE group (0.82+/-0.14) and SPE group (0.93+/-0.13) were significantly higher than that in control group (0.70+/-0.12, P<0.01). The expression of Rock II protein of placenta in MPE group (0.79+/-0.15) and SPE group (0.92+/-0.12) were significantly higher compared with control group (0.68+/-0.11, P<0.01). The expression of Rock II mRNA and protein of placenta in SPE group were higher compared with MPE group (P<0.01). (2) The expression of Rock II mRNA of umbilical artery in MPE group (0.69+/-0.13) and SPE group (0.55+/-0.12) were significantly lower than that in control group (0.76+/-0.10, P<0.01). The expression of Rock II protein of umbilical artery in MPE group (0.68+/-0.10) and SPE group (0.51+/-0.12) were lower compared with control group (0.75+/-0.13, P<0.01). The expression of Rock II mRNA and protein of umbilical artery in SPE group were significantly lower compared with MPE group (P<0.01). (3) There were no correlations between the expression of Rock II mRNA and protein in placenta and umbilical artery and the S/D value and birth weight (P>0.05). CONCLUSION: The upregulated expression of Rock II in placentas and downregulated expression in umbilical artery may be a compensation in preeclampsia.