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1.华南理工大学生物科学与工程学院,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.广东省人民医院广东省临床药理学重点实验室,广东 广州 510080
5.广东省人民医院检验科,广东 广州 510080
6.广东省人民医院麻醉科,广东 广州 510080
SHAN Zhi-xin; E-mail: shanzhixin@gdph.org.cn
Received:30 June 2022,
Published:20 November 2022
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丰嘉欣,郭继深,梁俣等.Circ_0018478通过编码HERC4-193发挥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),2022,43(06):995-1004.
FENG Jia-xin,GUO Ji-shen,LIANG Yu,et al.Circ_0018478 Inhibits the Fibrotic Phenotype of Cardiac Fibroblasts via Encoding Protein HERC4-193[J].Journal of Sun Yat-sen University(Medical Sciences),2022,43(06):995-1004.
丰嘉欣,郭继深,梁俣等.Circ_0018478通过编码HERC4-193发挥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),2022,43(06):995-1004. DOI: 10.13471/j.cnki.j.sun.yat-sen.univ(med.sci).2022.0615.
FENG Jia-xin,GUO Ji-shen,LIANG Yu,et al.Circ_0018478 Inhibits the Fibrotic Phenotype of Cardiac Fibroblasts via Encoding Protein HERC4-193[J].Journal of Sun Yat-sen University(Medical Sciences),2022,43(06):995-1004. DOI: 10.13471/j.cnki.j.sun.yat-sen.univ(med.sci).2022.0615.
目的
2
探究环状RNA circ_0018478调控心肌成纤维细胞纤维化表型的作用和可能机制。
方法
2
RT-qPCR检测健康器官捐献者(
n
=18)和心衰(
n
=28)患者心肌中circ_0018478及其宿主基因含E3泛素蛋白连接酶4的HECT和RLD结构域(
HERC4
)的表达水平。荧光原位杂交(FISH)实验和核质RNA定量检测circ_0018478的细胞分布情况,放线菌素D干预实验和核糖核酸外切酶(RNase R)消化实验检测circ_0018478的RNA稳定性。过表达腺病毒介导的circ_0018478时,分别在RNA和蛋白水平检测乳小鼠心肌成纤维细胞(mCFs)中如Ⅰ型和Ⅲ型胶原等纤维化相关基因表达的影响。利用EdU染色和Trans-well细胞迁移实验鉴定circ_0018478对mCFs增殖和迁移能力的影响。质谱shot-gun分析circ_0018478可能翻译蛋白的肽段序列。利用小干扰RNA(siRNA)抑制HERC4-193表达,检测对circ_0018478调控mCFs纤维化表型的影响。
结果
2
在心衰病人心肌中,相较于无显著表达差异的宿主基因HERC4,环形RNA circ_0018478表达显著增加。FISH和核质分离实验结果证实circ_0018478主要定位于心肌细胞胞质中。放线菌素D和RNase R消化实验证实circ_0018478具有典型的RNA稳定性。过表达circ_0018478可抑制mCFs的增殖、迁移和纤维化相关基因的表达。质谱shot-gun和Western blot检测结果提示circ_0018478可翻译预期的HERC4-193蛋白。过表达circ_0018478和HERC4-193可一致地抑制mCFs的纤维化表型,而抑制HERC4-193表达可有效减弱circ_0018478抑制mCFs中纤维化相关基因表达的作用(
P
<
0.05)。
结论
2
Circ_0018478通过翻译蛋白HERC4-193发挥抑制心肌成纤维细胞纤维化表型的作用。
Objective
2
To investigate the effect of circ_0018478 on the fibrotic phenotype of cardiac fibroblasts and the potential mechanism involved.
Methods
2
The expression of circ_0018478 and its host gene of HECT and RLD domain containing E3 ubiquitin protein ligase 4 (
HERC4
) in the myocardium of patients with heart failure (HF) (
n
=28) and healthy donors (
n
=18) was analyzed by real-time quantitative polymerase chain reaction (RT-qPCR) assay. The distribution of circ_0018478 was identified by fluorescence in situ hybridization (FISH) assay and RT-qPCR assay based on nucleocytoplasmic RNA in human AC16 cardiomyocytes. Actinomycin D and RNase R exonuclease digestion were used to test the stability of circ_0018478 in AC16 cells. RNA and protein expression of fibrosis-related genes was detected in mouse cardiac fibroblasts (mCFs) with adenovirus-mediated over-expression of circ_0018478. EdU staining and transwell migration assay were performed to detect the effects of circ_0018478 on mCFs proliferation and migration activities. The potential circ_0018478-translated protein in mCFs was identified by mass spectrometry (MS) shot-gun assay. HERC4-193 was inhibited by small interfering RNA (siRNA), and the effect of HERC4-193 knock-down on the fibrotic phenotype of mCFs with over-expression of circ_0018478 was studied.
Results
2
The expression of circ_0018478 was up-regulated in the myocardium of HF patients, with no significant difference in its host gene of
HERC4
. The results of FISH and RT-qPCR assay showed that circ_0018478 was mainly in the cytoplasm of AC16 cardiomyocytes. The characteristic RNA stability of circ_0018478 was verified by Actinomycin D and RNase R assay, respectively. The enforced expression of circ_0018478 suppressed proliferation and migration of mCFs, and inhibited the expression of fibrosis-related genes in mCFs. The results of MS shot-gun assay and Western blotting showed that circ_0018478 could translate protein HERC4-193. Overexpression of the circ_0018478 and protein HERC4-193 could consistently inhibit the fibrotic phenotype of mCFs. Knock-down of HERC4-193 could attenuate the inhibitory effect of circ_0018478 on fibrosis-related gene expression in mCFs (
P
<
0.05).
Conclusions
2
Circ_0018478 inhibits the fibrotic phenotype of cardiac fibroblasts via translating HERC4-193 protein.
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