上海交通大学学报(医学版) ›› 2022, Vol. 42 ›› Issue (5): 578-582.doi: 10.3969/j.issn.1674-8115.2022.05.004

• 论著 · 基础研究 • 上一篇    下一篇

长链非编码RNA-B230352I09表达改变对H9C2心肌细胞增殖及周期的影响

徐斐翔(), 汪升, 薛明明, 童朝阳, 陈玉梅()   

  1. 复旦大学附属中山医院急诊科,上海 200032
  • 收稿日期:2022-02-14 接受日期:2022-05-16 出版日期:2022-05-28 发布日期:2022-05-28
  • 通讯作者: 陈玉梅 E-mail:xu.feixiang@zs-hospital.sh.cn;chen.yumei@zs-hospital.sh.cn
  • 作者简介:徐斐翔(1991—),男,住院医师,学士;电子信箱:xu.feixiang@zs-hospital.sh.cn
  • 基金资助:
    国家自然科学基金(81800230)

Effect of altered expression of long non-coding RNA-B230352I09 on proliferation and cycle of H9C2 cardiomyocytes

XU Feixiang(), WANG Sheng, XUE Mingming, TONG Chaoyang, CHEN Yumei()   

  1. Department of Emergency Medicine, Zhongshan Hospital, Fudan University, Shanghai 200032, China
  • Received:2022-02-14 Accepted:2022-05-16 Online:2022-05-28 Published:2022-05-28
  • Contact: CHEN Yumei E-mail:xu.feixiang@zs-hospital.sh.cn;chen.yumei@zs-hospital.sh.cn
  • Supported by:
    National Natural Science Foundation of China(81800230)

摘要:

目的·探讨长链非编码RNA-B230352I09(long non-coding RNA-B230352I09,lncRNA-B230352I09)表达改变对H9C2心肌细胞增殖及周期的影响。方法·构建lncRNA-B230352I09过表达载体(pcDNA-B230352I09)和阴性对照(negative control,NC)载体(pcDNA-NC),借助阳离子脂质体Lipofectamine 3000(Lipo3000)转染液将上述构建的载体转染至H9C2心肌细胞。实验分为空白对照组、阴性对照组、lncRNA-B230352I09过表达组,分别通过实时荧光定量聚合酶链反应(real-time fluorescence quantitative polymerase chain reaction,RT-PCR)检测lncRNA-B230352I09的表达量,验证其转染效率;细胞计数试剂盒8(cell counting kit-8,CCK8)检测H9C2心肌细胞在450 nm波长的吸光度(optical density,OD)并绘制生长曲线;5-乙炔基-2'-脱氧尿嘧啶(5-ethynyl-2'-deoxyuridine,EdU)标记增殖期H9C2心肌细胞并通过荧光显微镜观察增殖心肌细胞的数量;流式细胞术分析H9C2心肌细胞在不同细胞周期所占比例;RT-PCR检测H9C2细胞周期相关调控基因的表达情况。结果·与阴性对照组比较,lncRNA-B230352I09过表达组中lncRNA-B230352I09的表达水平显著升高(P=0.000),提示lncRNA-B230352I09转染H9C2心肌细胞模型构建成功。CCK8实验显示,与阴性对照组相比,lncRNA-B230352I09过表达可显著提高H9C2心肌细胞的OD值,促进H9C2心肌细胞增殖,表现为明显的时间依赖性细胞增殖能力增强(24 h:P=0.000;48 h:P=0.000;72 h:P=0.001);荧光显微镜观察发现,与阴性对照组相比,lncRNA-B230352I09过表达组中EdU标记阳性的H9C2心肌细胞比例明显增多;流式细胞术分析显示,和阴性对照组比较,lncRNA-B230352I09过表达组中处于S期的H9C2心肌细胞比例明显增加,G1期心肌细胞的比例下降(P=0.000);RT-PCR检测结果显示,与阴性对照组比较,lncRNA-B230352I09过表达组中H9C2心肌细胞周期蛋白D1(cyclin D1)和细胞周期蛋白依赖性激酶1(cyclin dependent protein kinase 1,CDK1)的mRNA表达水平显著升高(P=0.000)。结论·lncRNA-B230352I09通过调节cyclin D1和CDK1促进心肌细胞进入S期,增强H9C2心肌细胞增殖能力。

关键词: H9C2心肌细胞, 长链非编码RNA-B230352I09, 过表达, 细胞增殖, 细胞周期

Abstract:

Objective·To investigate the effect of altered expression of long non-coding RNA (lncRNA)-B230352I09 on proliferation and cycle of H9C2 cardiomyocytes.

Methods·The lncRNA-B230352I09 overexpression vector (pcDNA-B230352I09) and the negative control vector pcDNA-negative control group (NC) were constructed and transfected into H9C2 cardiomyocytes with the Lipofectamine 3000 (Lipo3000) transfection solution. The expression of lncRNA-B230352I09 was measured by real-time fluorescence quantitative polymerase chain reaction (RT-PCR) to verify its transfection efficiency. The H9C2 cardiomyocytes were divided into blank control group, pcDNA-NC group, and lncRNA-B230352I09 overexpression group. Cell counting kit-8 (CCK8) was used to measure the absorbance (optical density, OD) of H9C2 cardiomyocytes at a wavelength of 450 nm and draw a growth curve; 5-ethynyl-2'-deoxyuridine (EdU) was used to label proliferating H9C2 cardiomyocytes, the numbers of which were observed by fluorescence microscopy. Cardiomyocyte cycle was assessed by flow cytometry and cycle-related genes expression was measured by RT-PCR.

Results·Compared with the pcDNA-NC group, the expression level of lncRNA-B230352I09 was significantly higher in the lncRNA-B230352I09 overexpression group (P=0.000), suggesting that the lncRNA-B230352I09-transfected H9C2 cardiomyocyte model was successfully constructed. Compared with the pcDNA-NC group, the CCK8 assay showed that lncRNA-B230352I09 overexpression significantly increased the OD of H9C2 cardiomyocytes and promoted the proliferation of H9C2 cardiomyocytes with a significant time-dependent enhancement of cell proliferation (24 h: P=0.000; 48 h: P=0.000; 72 h: P=0.001). Fluorescence microscopy revealed that the proportion of EdU-labeled positive H9C2 cardiomyocytes was significantly increased in the lncRNA-B230352I09 overexpression group compared to the pcDNA-NC group. Flow cytometric analysis showed a significant increase in the proportion of H9C2 cardiomyocytes in S phase and a decrease in G1 phase in the lncRNA-B230352I09 overexpression group compared to the pcDNA-NC group (P=0.000). RT-PCR showed that the mRNA expression levels of cyclin D1 and cyclin dependent protein kinase 1 (CDK1) in the lncRNA-B230352I09 overexpression group were significantly higher compared with the pcDNA-NC group (P=0.000).

Conclusion·lncRNA-B230352I09 can enhance myocardial proliferative capacity by regulating cyclin D1 and CDK1 to promote the entry of cardiomyocytes to into S phase.

Key words: H9C2 cardiomyocyte, lncRNA-B230352I09, overexpression, cell proliferation, cell cycle

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