妊娠期高血压疾病孕妇胎盘小动脉平滑肌大电导钙激活钾通道表达水平的定量测定

目的：观察妊娠期高血压疾病（HDCP）孕妇胎盘小动脉中大电导钙激活钾通道（BKCa）的蛋白表达，探讨BKCa在该疾病发生机制中的作用。方法取 HDCP孕妇（HDCP组，＝15）与健康孕妇（NT组，n＝15）胎盘小动脉平滑肌，用蛋白免疫印迹法（Western blot）检测BKCa通道α亚基及β1亚基的蛋白水平。结果胎盘小动脉平滑肌检测显示，BKCa通道α亚基在NT组的蛋白相对表达量为1．0282±0．1806，HDCP组为1．0012±0．1698，差异无统计学意义（P＞0．05）；β1亚基在NT组的蛋白相对表达量为1．6168±0．0126，HDCP组为0．4181±0．0808，差异有统计学意义（P＜0．05）。结论 HDCP胎盘小动脉平滑肌BKCa通道α亚基蛋白表达无明显变化，β1亚基蛋白表达均明显下调。由此推测大电导钙激活钾通道可能参与了 HDCP的发生、发展，β1亚基的异常表达可能是导致HDCP血管舒缩功能障碍的一个重要基础。

The quantitative determination of BKCa channels in placental arteriole smooth muscle cells of hypertensive disorder complicating pregnancy

Objective To observe the change of protein levels of large conductance calcium activated potassium channel (BK‐Ca) in placental arteriole smooth muscle cells from hypertensive disorder complicating pregnancy and discuss its role .Methods Western blot analysis was used to examine protein expression of α subunit andβ1 subunit of BKCa channels in placental arteriole smooth muscle cells from hypertensive disorder complicating pregnancy .Results The relative protein expression level of α‐subunit in the HDCP group was 1 .001 2 ± 0 .169 8(n=15) ,and the NT group was 1 .028 2 ± 0 .180 6 (n=15) .There was no significant differences between the two groups (P> 0 .05);the relative protein expression level of β1 subunit in the HDCP group was 0 .418 1 ± 0 .080 8 (n=15) ,and the NT group was 1 .616 8 ± 0 .012 6 (n=15) ,theβ1‐subunit protein expression levels of HDCP group were significantly lower (P<0 .05) .Conclusion The protein expression ofβ1‐subunit ,but notα‐subunit ,was reduced in pla‐cental arteriole smooth muscle cells from hypertensive disorder complicating pregnancy .Therefore ,BKCa channel activity may have been involved in hypertensive disorder complicating pregnancy ;and the abnormal expression ofβ1 subunit maybe an important basis in hypertensive disorder complicating pregnancy .