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Title: [Regulatory relationship between lncRNA KCNQ1OT1 and miR-146a-3p in preeclampsia].
Author: Chen FR, Zheng LM, Wu DC, Gong HM, Cen H, Chen WC.
Journal: Zhonghua Fu Chan Ke Za Zhi; 2020 Aug 25; 55(8):535-543. PubMed ID: 32854478.
Abstract:
Objective: To observe the changes of the expression level of long non-coding RNA (lncRNA) KCNQ1OT1 and microRNA (miR)-146a-3p in placenta tissues of preeclampsia (PE) patients, as well as their effect and mechanism on the biological functions of trophoblast cells. Methods: A total of 45 cases of hospitalized PE patients in Hainan General Hospital from July 2017 to July 2018 were selected as the PE group, 55 normal pregnant women during the same period were chosed as the control group. The expression level of KCNQ1OT1 mRNA and miR-146a-3p in the placenta tissues between two groups were detected by using quantitative real time (qRT)-PCR. Pearson's test was furtherly analyzed the correlation between them. Human trophoblast cell line (HTR8/SVneo) were randomly divided into control and lipopolysaccharide (LPS) groups, and then LPS group were divide into four sub-groups,included LPS group, short hairpin RNA (sh)-KCNQ1OT1 (after silencing the expression of KCNQ1OT1), miR-146a-3p inhibitor and sh-KCNQ1OT1+miR-146a-3p inhibitor. The targeting relationship between KCNQ1OT1 and miR-146a-3p were predicted by bioinformatics software and confirmed by luciferase assay. The cell proliferation and invasion capacities were respectively detected by cell counting kit-8 (CCK-8) and transwell assay. The expression level of KCNQ1OT1 mRNA and miR-146a-3p were detected by qRT-PCR and the protein expression level of CXC chemokine ligand 12 （CXCL12） and CXC chemokine receptor type 4 (CXCR4) were tested by western blot. Results: (1) The mRNA expression level of KCNQ1OT1 in the placenta of PE group was lower than that of control group (0.23±0.03 vs 0.51±0.04, P<0.05), and the miR-146a-3p expression level was higher than that of the control group (0.49±0.03 vs 0.31±0.03, P<0.05), there were statistical significant differences between the two groups. (2) Luciferase assay showed that there was a targeting relationship between KCNQ1OT1 and mir-146a-3p. Compared with the control group, the mRNA expression level of KCNQ1OT1 in the LPS group were significantly decreased (0.91±0.03 vs 0.35±0.03, P<0.05), and the expression level of miR-146a-3p were significantly increased (0.22±0.03 vs 0.63±0.04, P<0.05). The cell proliferation, invasion and migration capacities and the protein expression of CXCL12 and CXCR4 significantly reduced in the LPS group compared with control group (all P<0.05). The mRNA expression level of KCNQ1OT1 (0.23±0.03) in the sh-KCNQ1OT1 group were further decreased, the expression of miR-146a-3p (0.85±0.03) were further increased, and the cell proliferation, invasion and migration capacities and the protein expression of CXCL12 and CXCR4 were all further reduced compared with control group，there were significant difference between two groups (all P<0.05). Comparing the miR-146a-3p inhibitor group, and sh-KCNQ1OT1+miR-146a-3p inhibitor group with the sh-KCNQ1OT1 group, respectively, the expression level of KCNQ1OT1 mRNA (0.78±0.04 vs 0.50±0.03) increased, and the expression level of miR-146a-3p (0.42±0.03 vs 0.46±0.03) decreased, the cell proliferation, invasion and migration capacities and the protein expression of CXCL12 and CXCR4 were all increased ,there were statistically significant differences (all P<0.05). Conclusion: KCNQ1OT1 could target the regulation of miR-146a-3p through CXCL12/CXCR4 pathway in the proliferation, invasion an migration of HTR8/SVneo cells, which may be involved in the pathogenesis of PE. 目的： 观察长链非编码RNA（lncRNA）钾电压门控通道亚家族Q成员1反向转录物1（KCNQ1OT1）和微小RNA（miR）-146a-3p在子痫前期（PE）胎盘组织中的表达，并初步探索两者相互调控后对滋养细胞生物学特性的影响及作用机制。 方法： （1）选择2017年7月—2018年7月在海南省人民医院住院的PE孕妇45例为PE组，选择同期正常孕妇55例为对照组，采用实时荧光定量PCR技术检测两组胎盘组织中KCNQ1OT1 mRNA、miR-146a-3p的表达，并分析两者的相关性。（2）采用绒毛膜滋养细胞层细胞系HTR8/SVneo细胞，先分为空白对照组和脂多糖（LPS）组，经LPS处理24 h的HTR8/SVneo细胞再进一步分为短发夹状RNA（sh）-KCNQ1OT1组（即沉默KCNQ1OT1的表达）、miR-146a-3p抑制物（inhibitor）组和sh-KCNQ1OT1+miR-146a-3p inhibitor组，共5组。应用生物信息学软件预测KCNQ1OT1和miR-146a-3p的靶向关系，并采用双荧光素酶报告基因实验加以验证；分别采用活细胞计数（CCK-8）法、划痕实验、穿膜（transwell）小室实验检测HTR8/SVneo细胞的增殖、迁移、侵袭能力，实时荧光定量PCR技术检测细胞中KCNQ1OT1 mRNA、miR-146a-3p的表达，蛋白印迹（western blot）法检测细胞中趋化因子12（CXCL12）和趋化因子受体4（CXCR4）蛋白的表达。 结果： （1）PE组胎盘组织中KCNQ1OT1 mRNA的表达水平低于对照组（分别为0.23±0.03、0.51±0.04），miR-146a-3p的表达水平高于对照组（分别为0.49±0.03、0.31±0.03），两组分别比较，差异均有统计学意义（P<0.05）；PE组胎盘组织中KCNQ1OT1 mRNA的表达水平与miR-146a-3p的表达水平呈负相关（r=-0.79，P=0.031）。（2）生物信息学软件预测并经双荧光素酶报告基因实验验证显示，KCNQ1OT1与miR-146a-3p存在靶向关系。与空白对照组相比，LPS组细胞中KCNQ1OT1 mRNA的表达水平下降（分别为0.91±0.03、0.35±0.03），miR-146a-3p的表达水平升高（分别为0.22±0.03、0.63±0.04），细胞的增殖、侵袭、迁移能力及CXCL12、CXCR4蛋白的表达均下降，分别比较，差异均有统计学意义（P<0.05）；sh-KCNQ1OT1组细胞中KCNQ1OT1 mRNA的表达水平（0.23±0.03）进一步下降，miR-146a-3p的表达水平（0.85±0.03）进一步上升，细胞的增殖、侵袭、迁移能力及CXCL12、CXCR4蛋白的表达均进一步下降，分别比较，差异均有统计学意义（P<0.05）；而miR-146a-3p inhibitor组、sh-KCNQ1OT1+miR-146a-3p inhibitor组分别与sh-KCNQ1OT1组比较，KCNQ1OT1 mRNA的表达水平（分别为0.78±0.04、0.50±0.03）升高，miR-146a-3p的表达水平（分别为0.42±0.03、0.46±0.03）下降，细胞的增殖、侵袭、迁移能力及CXCL12、CXCR4蛋白的表达均增高，分别比较，差异均有统计学意义（P<0.05）。 结论： KCNQ1OT1负调控miR-146a-3p的表达，激活CXCL12/CXCR4信号通路后，可促进滋养细胞的增殖、迁移和侵袭，可能参与了PE的发病。.

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