1.华南理工大学医学院,广东 广州 510006
2.南方医科大学第二临床医学院,广东 广州 510280
3.广东省心血管病研究所心内科,广东 广州 510080
4.广东省人民医院检验科,广东 广州 510080
5.广东省人民医院麻醉科,广东 广州 510080
6.广东省临床药理学重点实验室//南方医科大学附属广东省人民医院//广东省医学科学院 广东 广州 510080
胡雅婷,第一作者,研究方向:心肌纤维化的分子机制,E-mail:786491725@qq.com
纸质出版日期:2024-01-20,
收稿日期:2023-09-13,
录用日期:2023-11-27
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胡雅婷,高原,伍华燕等.CircSLC8A1_005通过编码蛋白抑制心肌成纤维细胞纤维化表型的作用[J].中山大学学报(医学科学版),2024,45(01):35-44.
HU Yating,GAO Yuan,WU Huayan,et al.CircSLC8A1_005 Inhibits the Fibrotic Phenotype of Cardiac Fibroblasts by Encoding Protein[J].Journal of Sun Yat-sen University(Medical Sciences),2024,45(01):35-44.
胡雅婷,高原,伍华燕等.CircSLC8A1_005通过编码蛋白抑制心肌成纤维细胞纤维化表型的作用[J].中山大学学报(医学科学版),2024,45(01):35-44. DOI: 10.13471/j.cnki.j.sun.yat-sen.univ(med.sci).2024.0106.
HU Yating,GAO Yuan,WU Huayan,et al.CircSLC8A1_005 Inhibits the Fibrotic Phenotype of Cardiac Fibroblasts by Encoding Protein[J].Journal of Sun Yat-sen University(Medical Sciences),2024,45(01):35-44. DOI: 10.13471/j.cnki.j.sun.yat-sen.univ(med.sci).2024.0106.
目的
2
探究环形RNA circSLC8A1_005调控心肌成纤维细胞纤维化表型的作用及可能机制。
方法
2
利用腺病毒介导在小鼠心肌成纤维细胞(mCFs)中过表达circSLC8A1_005,并检测mCFs中纤维化相关因I型胶原α1链(Col1a1)、Ⅲ型胶原α1链(Col3a1)和平滑肌肌动蛋白α2(Acta2)基因表达,通过EdU和划痕实验检测不同干预对mCFs的增殖和迁移能力的影响。双萤光素酶报告基因实验检测circSLC8A1_005包含的潜在核糖体进入序列(IRES)的活性。通过Western blot实验检测circSLC8A1_005翻译蛋白SLC8A1-605aa及其在细胞内分布情况。双萤光素酶报告基因实验检测SLC8A1-605aa对超氧化物歧化酶2(Sod2)的转录激活作用。通过RNA结合蛋白免疫沉淀(RIP)实验检测SLC8A1-605aa与Sod2 mRNA的结合作用。放线菌素D实验检测SLC8A1-605aa对Sod2 mRNA稳定性的影响。
结果
2
利用腺病毒可在mCFs中有效介导过表达circSLC8A1_005,过表达circSLC8A1_005可显著抑制mCFs中纤维化相关基因表达,抑制mCFs的增殖和迁移能力。双萤光素酶报告基因实验结果提示circSLC8A1_005包含的2个IRES具有活性。Western blot检测结果显示circSLC8A1_005可翻译预期大小为70 ku的SLC8A1-605aa蛋白,并主要分布于细胞核内。过表达SLC8A1-605aa和circSLC8A1_005可一致地抑制mCFs的纤维化表型。SLC8A1-605aa可特异上调超氧化物歧化酶2(Sod2)表达,但并不能转录激活Sod2表达;RIP实验结果显示SLC8A1-605aa与Sod2 mRNA有特异结合作用,而放线菌素D实验结果显示SLC8A1-605aa能够增强Sod2 mRNA的稳定性。
结论
2
CircSLC8A1_005通过翻译蛋白SLC8A1-605aa发挥抑制心肌成纤维细胞纤维化表型的作用,SLC8A1-605aa可能是潜在的用于心肌纤维化治疗的靶点。
Objective
2
To investigate the effect of circSLC8A1_005 on the fibrotic phenotype of cardiac fibroblasts and the potential mechanism involved.
Methods
2
The effect of adenovirus-mediated overexpression of circSLC8A1_005 on the expression of fibrosis-related genes, collagen type I alpha 1 chain (Col1a1), collagen type Ⅲ alpha 1 chain (Col3a1) and smooth muscle actin alpha 2 (Acta2), in mouse cardiac fibroblasts (mCFs) were detected. The proliferation and migration activities of mCFs were detected by EdU and wound-healing assay, respectively. Dual luciferase reporter gene assay was performed to detect the activity of potential internal ribozyme entry site (IRES) in circSLC8A1_005. CircSLC8A1_005-translated protein, SLC8A1-605aa, and its intracellular distribution was identified by Western blot assay. The effect of SLC8A1-605aa protein on transcription activity of Sod2 gene was detected by the dual luciferase reporter gene assay. RNA binding protein immunoprecipitation (RIP) was utilized to verify the interaction between SLC8A1-605aa and superoxide dismutase 2 (Sod2) mRNA. Actinomycin D treatment was used to detect the effect of SLC8A1-605aa on Sod2 mRNA stability in mCFs.
Results
2
An efficient adenovirus-mediated overexpression of circSLC8A1_005 was achieved in mCFs. The enforced expression of circSLC8A1_005 suppressed proliferation and migration of mCFs, and inhibited the expression of fibrosis-related genes in mCFs. The dual luciferase reporter gene assay revealed the activities of 2 IRES in circSLC8A1_005. Results of Western blot assay showed that circSLC8A1_005 could translate protein SLC8A1-605aa with the prospected molecular weight of 70 ku, which is predominantly distributed in the nucleus. Overexpression of the circSLC8A1_005 and SLC8A1-605aa could consistently inhibit the fibrotic phenotype of mCFs. SLC8A1-605aa could up-regulate superoxide dismutase 2 (Sod2) expression, but not at the transcriptional level. RIP assay indicated that SLC8A1-605aa could specifically interact with Sod2 mRNA, and the results of actinomycin D assay showed that SLC8A1-605aa could enhance the stability of Sod2 mRNA in mCFs.
Conclusion
2
CircSLC8A1_005 inhibits the fibrotic phenotype of cardiac fibroblasts via translating SLC8A1-605aa protein, and SLC8A1-605aa may be a potential target for the treatment of myocardial fibrosis.
心肌纤维化环形RNAcircSLC8A1_005翻译心肌成纤维细胞
cardiac fibrosiscircular RNAcircSLC8A1_005translationcardiac fibroblast
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