Background::Recent studies have reported circular RNA (circRNA) expression profiles in various tissue types; however, circRNA expression profile in human epicardial adipose tissue (EAT) remains undefined. This work aimed to compare circRNA expression patterns in EAT between the heart failure (HF) and non-HF groups.Methods::RNA-sequencing was carried out to compare circRNA expression patterns in EAT specimens from coronary artery disease cases between the HF and non-HF groups. Quantitative real-time polymerase chain reaction was performed for validation. Comparisons of patient characteristics between the two groups were using t test, Mann-Whitney U test, and Chi-squared test. Results::A total of 141 circRNAs substantially different between the HF and non-HF groups ( P < 0.05; fold change >2) were detected, including 56 up-regulated and 85 down-regulated. Among them, hsa_circ_0005565 stood out, for it had the highest fold change and was significantly increased in HF patients in quantitative real-time polymerase chain reaction validation. The top highly expressed EAT circRNAs corresponded to genes involved in cell proliferation and inflammatory response, including GSE1, RHOBTB3, HIPK3, UBXN7, PCMTD1, N4BP2L2, CFLAR, EPB41L2, FCHO2, FNDC3B, and SPECC1. The top enriched Gene Ontology term and Kyoto Encyclopedia of Genes and Genomes pathway were positive regulation of metabolic processes and insulin resistance, respectively. Conclusion::These data indicate EAT circRNAs may contribute to the pathogenesis of metabolic disorders causing HF.

目的 分析环状RNA同源结构域相互作用蛋白激酶3(circ_HIPK3)靶向miR-381-3p/锌指蛋白217(ZNF217)轴对β淀粉样蛋白(Aβ)诱导的海马神经元功能和形态的影响.方法 制备新生大鼠海马神经元,分为对照组、Aβ组、si NC1组、si HIPK3组、si HIPK3+inhibitor NC组、si HIPK3+miR-381-3p inhibitor组、si HIPK3+miR-381-3p inhibitor+si NC2组、si HIPK3+miR-381-3p inhibitor+si ZNF217组,除对照组外其余组均通过40 μmol/L Aβ1～42诱导.qRT-PCR法测定海马神经元circ_HIPK3、miR-381-3p、ZNF217 mRNA表达,透射电镜观察细胞形态,CCK-8法测定海马神经元存活率,Hochesst 33342法测定海马神经元凋亡,流式细胞仪检测海马神经元内Ca2+荧光强度,Western blot法测定海马神经元磷酸化Tau蛋白(P-Tau)、B淋巴细胞瘤-2(Bcl-2)、Bcl-2相关X蛋白(Bax)、胱天蛋白酶-3(Caspase-3)、ZNF217蛋白表达,双萤光素酶报告基因分析miR-381-3p与circ_HIPK3、ZNF217靶向关系.结果 对照组海马神经元结构正常,胞核形态正常,线粒体、内质网无病理改变;Aβ组海马神经元呈退行性改变,核形态异常,膜内陷,可见大量线粒体肿胀,胞浆内含大量脂滴空泡;与Aβ组相比,si HIPK3组海马神经元结构部分恢复;与si HIPK3组相比,si HIPK3+miR-381-3p inhibitor组海马神经元结构损伤严重;与si HIPK3+miR-381-3p inhibitor组相比,si HIPK3+miR-381-3p inhibitor+si ZNF217组海马神经元结构损伤减轻.与对照组相比,Aβ组海马神经元circ_HIPK3、ZNF217 mRNA和蛋白表达、凋亡率、Ca2+荧光强度、P-Tau、Bax、Caspase-3蛋白表达升高,miR-381-3p表达、存活率、Bcl-2蛋白表达降低(P＜0.05);与Aβ组相比,si HIPK3组海马神经元circ_HIPK3、ZNF217 mRNA和蛋白表达、凋亡率、Ca2+荧光强度、P-Tau、Bax、Caspase-3蛋白表达降低,miR-381-3p表达、存活率、Bcl-2蛋白表达升高(P＜0.05);与si HIPK3组相比,si HIPK3+miR-381-3p inhibitor组海马神经元circ_HIPK3、ZNF217 mRNA和蛋白表达、凋亡率、Ca2+荧光强度、P-Tau、Bax、Caspase-3蛋白表达升高,miR-381-3p水平、存活率、Bcl-2蛋白表达降低(P＜0.05);与si HIPK3+miR-381-3p inhibitor组相比,si HIPK3+miR-381-3p inhibitor+si ZNF217组海马神经元ZNF217 mRNA和蛋白表达水平、凋亡率、Ca2+荧光强度、P-Tau、Bax、Caspase-3蛋白表达降低,存活率、Bcl-2蛋白表达升高(P＜0.05);miR-381-3p与circ_HIPK3、ZNF217均靶向结合.结论 circ_HIPK3沉默可能通过调控miR-381-3p/ZNF217轴改善Aβ诱导的海马神经元结构功能损伤.

目的 探讨人血清环状RNA同源性蛋白激酶3(CircHIPK3)靶向微RNA-338(miR-338)对胶质瘤细胞U251细胞侵袭、迁移的影响.方法 2021年2-12月,在武汉大学人民医院科研中心将U251细胞分为空白(NG)组、CircHIPK3阴性对照(sh-control)组、HIPK3敲减(sh-CircHIPK3)组,实时荧光定量PCR(qRT-PCR)检测U251细胞中CircHIPK3、miR-338表达水平;Tran-swell检测细胞迁移与侵袭;划痕法检测细胞迁移;流式细胞术检测细胞周期;通过Circular RNA Interactome、RegRNA2.0、Circ-Bank Database 网站预测CircHIPK3(ID:hsa_circ_0000284)的靶向miRNA并用双萤光素酶实验验证,蛋白质印迹法检测基质金属蛋白酶(MMP)-2、MMP-9蛋白表达.结果 与NG组、sh-control组比较,sh-CircHIPK3组中CircHIPK3(1.00±0.00、1.06±0.26比0.56±0.06)表达水平显著降低(P<0.05),miR-338(1.00±0.00、1.12±0.19比1.89±0.28)表达、G1期细胞比例[(58.72±0.36)%、(58.45±0.27)%比(64.72±0.47)%]升高(P<0.05),U251细胞侵袭数目[(164.89±12.55)个、(165.77±12.16)个比(80.13±11.37)个]、划痕愈合率[(25.66±2.37)%、(26.38±2.53)%比(10.36±1.53)%]、迁移细胞数目[(196.72±18.75)个、(194.65±17.86)个比(95.58±8.66)个]、S期细胞比例[(26.45±0.39)%、(26.57±0.41)%比(20.72±0.18)%]明显降低(P<0.05);miR-338是CircHIPK3的靶基因.与NG组、sh-control组比较,sh-CircHIPK3组MMP-2(1.31±0.23、1.33±0.20比0.61±0.05)、MMP-9(1.16±0.22、1.15±0.21比0.85±0.19)蛋白表达水平均显著降低(P<0.05).结论 沉默CircHIPK3通过靶向上调miR-338表达能抑制胶质瘤细胞U251细胞迁移和侵袭.