摘要目的 探讨水通道蛋白8(AQP8)在原发性羊水过多产妇胎膜和胎盘组织中的表达.方法 收集2005年10月-2007年5月重庆医科大学附属第一医院和重庆市妇幼保健院行足月剖宫产分娩(孕37～40周)的原发性羊水过多产妇12例为羊水过多组,同期因社会因素行剖宫产分娩的正常产妇12例为对照组.采用RT-PCR技术检测两组产妇胎膜和胎盘组织中的AQP8 mRNA表达水平;采用免疫组化技术检测两组产妇胎膜和胎盘组织中的AQP8蛋白表达水平.结果 (1)羊水过多组羊膜、绒毛膜和胎盘组织中的AQP8 mRNA表达水平分别为0.78±0.13、0.58±0.10、0.86±0.15,对照组分别为0.39±0.07、0.45±0.09、0.34±0.09,羊水过多组各组织中AQPS mRNA表达水平均高于对照组,两组分别比较,差异均有统计学意义(P<0.05).(2)羊水过多组羊膜、绒毛膜和胎盘组织中的AQP8蛋白表达水平分别为0.195±0.024、0.170±0.028、0.193±0.024,对照组分别为0.151±0.018、0.156±0.024、0.152±0.023,其中羊水过多组羊膜、胎盘组织中AQP8蛋白表达水平均高于对照组,差异有统计学意义(P<0.05),而羊水过多组绒毛膜组织中AQP8蛋白表达水平虽高于对照组,但两组比较,差异无统计学意义(P>0.05).结论 原发性羊水过多产妇羊膜和胎盘组织中AQP8mRNA及蛋白的表达水平均显著高于正常产妇,提示AQP8在产妇羊水量的调节中发挥重要作用.

abstractsObjective To determine the expression of Aquaporin 8 (AQP8) in the fetal membrane and placenta of idiopathic polyhydramnios. Methods The amnion, chorion and placenta were collected from 12 term pregnancies with idiopathic polyhydramnios(polyhydramnios group) and 12 term pregnancies who were normal (control group). The expression of AQP8 mRNA was detected by reverse transcription-polymerase chain reaction (RT-PCR). The expression of AQP8 protein was detected by immunohistochemistry. Results The expression of AQP8 mRNA in amnion, chorion and placenta of polyhydramnios group was (0.78±0.13), (0.58±0.10), and (0.86±0.15) respectively, and that of control group was (0.39±0.07 ), (0.45±0.09),and (0.34±0.09) respectively. The expression of AQP8 protein in amnion, chorion and placenta of polyhydramnios group was (0.195±0.024), (0. 170±0.028), and (0. 193±0.024) respectively, and that of control group was (0. 151±0.018), (0.156±0.024), and (0. 152±0.023) respectively. In all 3 types of tissues the expression of AQP8 mRNA of polyhydramnios group was higher than that of control group (P<0.05). In anmion and placenta the expression of AQP8 protein of polyhydramnios group was also increased compared to that of control group (P<0.05), but in chorion the difference in AQP8 protein expression between the two groups was not significant(P>0.05). Conclusion The expression of AQP8 mRNA and protein is significantly increased in the anmion and placenta of polyhydramnios, suggesting that AQP8 may play an important role in the regulation of amniotic fluid volume.