子宫平滑肌组织中RhoA及Rho激酶的表达与分娩发动的关系

摘要

Objective To investigate the role of RhoA and Rho kinase system in the onset of labor. Methods Forty term pregnant women, who delivered through cesarean section at the Xiangya Second Hospital of Central South University from February 2007 to November 2007, were selected and divided into 2 groups: 20 in labor group and 20 in non-labor group. Another 20 non-pregnant women undergoing hysterectomy due to cervical intraepithelial neoplasia were chosen as the control. Real-time fluorescence quantitative RT-PCR and western blot were applied to detect the expression RhoA and ROCKⅠ mRNA and protein in uterine smooth muscle tissue and the correlation between the mRNA and protein expression of RhoA and ROCKⅠ were analyzed. Results (1) The mRNA expressions of both RhoA and ROCKⅠ were detected in all groups, and higher levels were found in the labor group than in the non-labor group and the control [RhoA mRNA: (3.51±0.56)×10-3 vs. (2.75±0.52)×10-3 and (2.11±0.54)×10-3; ROCKⅠ mRNA: (4.07±0.66)×10-3 vs. (2.71±0.52)×10-3 and(2.01±0.23)×10-3, P<0.01]. (2) RhoA and ROCKⅠ proteins were also identified in all three groups, and the expressions in the labor and non-labor group were higher than those of the control (RhoA protein: 0.72±0.23 and 0.64±0.17 vs. 0.46±0.15; ROCKⅠ protein: 0.56±0.14 and 0.42±0.16 vs. 0.29±0.08, P<0.01). (3) The expression of RhoA mRNA and ROCKⅠ mRNA were positively correlated in each of the three groups (r=0.73,P<0.01), and the same was found in the expression of RhoA protein and ROCKⅠ protein (r=0.37,P<0.01). Conclusion The increased expression of RhoA and Rho kinase may play an important role in the initiation of labor.%目的 探讨子宫平滑肌组织中RhoA及Rho激酶的表达变化及其在分娩发动中的作用.方法 选择2007年2至12月在中南大学湘雅二医院妇产科住院分娩的足月临产产妇20例(临产组),足月未临产产妇20例(未临产组);同期因宫颈上皮内瘤变行子宫切除术的患者20例为对照组.应用实时荧光定量RT-PCR技术和蛋白印迹法检测3组妇女子宫平滑肌组织中RhoA和Rho激酶亚型ROCKⅠ mRNA及其蛋白的表达水平,并对子宫平滑肌组织中RhoA mRNA及蛋白与ROCKⅠ mRNA及蛋白的表达水平行相关性分析.结果 (1) 3组妇女子宫平滑肌组织中RhoA mRNA和ROCKⅠmRNA的表达水平,临产组分别为(3.51±0.56)×10-3和(4.07±0.66)×10-3;未临产组分别为(2.75±0.52)×10-3和(2.71±0.52)×10-3;对照组分别为(2.11±0.54)×10-3和(2.01±0.23)×10-3.临产组产妇子宫平滑肌组织中RhoA mRNA和ROCKⅠ mRNA的表达水平均高于未临产组和对照组, 差异有统计学意义(P<0.01);3组间分别比较,差异均有统计学意义(P<0.05).(2)3 组妇女子宫平滑肌组织中RhoA蛋白和ROCKⅠ蛋白的表达水平,临产组分别为0.72±0.23和0.56±0.14;未临产组分别为0.64±0.17和0.42±0.16;对照组分别为0.46±0.15和0.29±0.08.RhoA蛋白在3组中的表达两两比较,差异均无统计学意义(P>0.05).临产组和未临产组产妇子宫平滑肌组织中ROCKⅠ蛋白表达水平均高于对照组,差异均有统计学意义(P<0.01).(3)3组妇女子宫平滑肌组织中RhoA mRNA表达与ROCKⅠ mRNA的表达水平呈正相关关系(r=0.73,P<0.01);3组妇女子宫平滑肌组织中RhoA蛋白表达与ROCKⅠ蛋白表达水平也呈正相关关系(r=0.37,P<0.01).结论 子宫平滑肌组织中RhoA及Rho激酶水平升高与产妇分娩发动密切相关.