子宫平滑肌激活蛋白-1及间隙连接蛋白43在妊娠期的表达与分娩发动和早产的关系

目的　探讨激活蛋白-1(Activator protein-1,AP-1)、间隙连接蛋白43(connexin43,Cx43)在足月产和早产子宫平滑肌中的表达情况及其相关性. 方法　应用免疫组化法检测15例足月未临产、15例足月临产、10例早产临产产妇的子宫平滑肌中AP-1的两个亚单位c-Jun、c-Fos蛋白及Cx43的表达情况. 结果 (1)Cx43免疫组化积分在早产临产组(4.204±0.42)及足月临产组(4.33±0.51)表达水平显著高于足月未临产组(3.15±0.41)(P<0.01).(2)c-Jun蛋白在早产临产组、足月临产组、足月未临产组标记指数分别为(52.34±4.18)%、(45.25±5.24)%、(34.14±4.26)%,三组两两比较差异均有统计学意义(P<0.01).(3)c-Fos蛋白在早产临产组、足月临产组、足月未临产组标记指数分别为(53.48±4.36)%、(43.32±6.21)%、(31.29±3.34)%,三组两两比较差异均有统计学意义(P<0.01).(4)妊娠子宫平滑肌中Cx43表达与c-Jun、c-Fos蛋白表达呈正相关关系,(r=0.65、0.63,P<0.01). 结论 Cx43在分娩发动中发挥着重要的作用.妊娠子宫平滑肌中Cx43的表达水平与AP-1表达有一定的相关性.

Correlation between the expression of activator protein-1 and connexin 43 in uterine smooth muscle during pregnancy and the onset of labor and preterm delivery

Objective To study the expression of activator protein-1(AP-1)and connexin 43(Cx43)in uterine smooth muscle of term pregnancy and its relationship with preterm delivery.Methods Immuno-histochemistry was applied for 15 uterine smooth muscle samples of term pregnancy without labor(Group Ⅰ),15 of term pregnancy in labor(group Ⅱ)and 10 of preterm delivery in labor(group Ⅲ)to investigate the expression of two subunits of AP-1(c-Jun and c-Fos)and Cx 43. Results (1)The expression of Cx43 in group Ⅰ and Ⅱ(4.33±0.51 and 4.20±0.42)were significantly higher than that in group Ⅲ(3.15±0.41,P<0.01).Lable index of c-Jun protein in group Ⅲ,Ⅱ and Ⅰ was(52.34±4.18)%,(45.25±5.24)%and(34.14±4.26)%,respectively (P<0.01),and the lable index of c-Fos protein was(53.48±4.36)%,(43.32±6.21)%and(31.29±3.34)%,respectively(P<0.01).Positive correlation was found between the expression of Cx43and c-Jun,c-Fos in pregnancy uterine smooth muscle(r=0.65,0.63,P<0.01). Conclusions The Cx43 plays an important role in the onset of labor.The expressions of Cx43 is positively related with the expression of AP-1 in pregnancy uterine smooth muscle.