Abstract
Viral myocarditis (VMC) is one of the most common acquired heart diseases in children and teenagers. However, its pathogenesis is still unclear, and effective treatments are lacking. This study aimed to investigate the regulatory pathway by which exosomes alleviate ferroptosis in cardiomyocytes (CMCs) induced by coxsackievirus B3 (CVB3). CVB3 was utilized for inducing the VMC mouse model and cellular model. Cardiac echocardiography, left ventricular ejection fraction (LVEF), and left ventricular fractional shortening (LVFS) were implemented to assess the cardiac function. In CVB3-induced VMC mice, cardiac insufficiency was observed, as well as the altered levels of ferroptosis-related indicators (glutathione peroxidase 4 (GPX4), glutathione (GSH), and malondialdehyde (MDA)). However, exosomes derived from human umbilical cord mesenchymal stem cells (hucMSCs-exo) could restore the changes caused by CVB3 stimulation. Let-7a-5p was enriched in hucMSCs-exo, and the inhibitory effect of hucMSCs-exolet-7a-5p mimic on CVB3-induced ferroptosis was higher than that of hucMSCs-exomimic NC (NC: negative control). Mothers against decapentaplegic homolog 2 (SMAD2) increased in the VMC group’ while the expression of zinc-finger protein 36 (ZFP36) decreased. Let-7a-5p was confirmed to interact with SMAD2 messenger RNA (mRNA), and the SMAD2 protein interacted directly with the ZFP36 protein. Silencing SMAD2 and overexpressing ZFP36 inhibited the expression of ferroptosis-related indicators. Meanwhile, the levels of GPX4, solute carrier family 7, member 11 (SLC7A11), and GSH were lower in the SMAD2 overexpression plasmid (oe-SMAD2)+let-7a-5p mimic group than in the oe-NC+let-7a-5p mimic group, while those of MDA, reactive oxygen species (ROS), and Fe2+ increased. In conclusion, these data showed that ferroptosis could be regulated by mediating SMAD2 expression. Exo-let-7a-5p derived from hucMSCs could mediate SMAD2 to promote the expression of ZFP36, which further inhibited the ferroptosis of CMCs to alleviate CVB3-induced VMC.
摘要
病毒性心肌炎(VMC)是儿童和青少年最常见的获得性心脏病之一。其发病机制尚不明确, 且缺乏有效的治疗方法。本研究旨在探讨外泌体减轻柯萨奇病毒B3(CVB3)诱导的心肌细胞(CMCs)铁死亡的调控通路。我们用CVB3诱导小鼠VMC模型和细胞模型, 使用心脏超声心动图、左室射血分数(LVEF)和左室短轴缩短率(LVFS)评价心功能。在CVB3诱导的VMC小鼠中, 我们观察到小鼠心功能不全和铁死亡相关指标(谷胱甘肽过氧化酶4(GPX4)、谷胱甘肽(GSH)和丙二醛(MDA))的表达失调。然而, 人脐带间充质干细胞来源的外泌体(hucMSCs-exo)可以恢复CVB3引起的改变。Let-7a-5p富集于hucMSCs-exo中, 且hucMSCs-exolet-7a-5p mimic对CVB3诱导的铁死亡的抑制作用高于hucMSCs-exomimic NC。在VMC组中, SMAD2表达升高, 而ZFP36表达降低。Let-7a-5p靶向SMAD2信使RNA(mRNA), 且SMAD2蛋白与ZFP36蛋白直接相互作用。沉默SMAD2和过表达ZFP36均可抑制铁死亡相关指标的表达。同时, 与oe-NC+let-7a-5p mimic组比较, oe-SMAD2+let-7a-5p mimic组中的GPX4、溶质载体家族7成员11(SLC7A11)和GSH水平降低, 而MDA、活性氧(ROS)和Fe2+水平升高。综上所述, 这些数据表明铁死亡可以通过介导SMAD2的表达来调节。HucMSCs来源的exo-let-7a-5p可以通过介导SMAD2促进ZFP36的表达, 进一步抑制CMCs的铁死亡, 从而缓解CVB3诱导的VMC。
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Data availability statement
The dataset used or analyzed during the current study is available from the corresponding author on reasonable request.
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Acknowledgments
This work was supported by the China Postdoctoral Science Foundation (No. 2022M712252) and the Natural Science Foundation of Sichuan Province, China (No. 2023NSFSC1634).
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Xin LI made significant contributions to conceptualization, data curation, investigation, methodology, validation, and writing of the original draft. Yanan HU, Yueting WU, Zuocheng YANG, and Yang LIU contributed to conceptualization, formal analysis, investigation, software, validation, and writing of the original draft. Hanmin LIU contributed significantly to conceptualization, funding acquisition, project administration, supervision, and review. All authors have read and approved the final version, and therefore, have full access to all the data in the study and take responsibility for the integrity and security of the data.
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Xin LI, Yanan HU, Yueting WU, Zuocheng YANG, Yang LIU, and Hanmin LIU declare that they have no conflict of interest.
The entire operation and experiments related to animals were approved by the Animal Ethics Committee of West China Second University Hospital, Sichuan University, Chengdu, China (No. 2022-137). All institutional and national guidelines for the care and use of laboratory animals were followed.
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Exosomal let-7a-5p derived from human umbilical cord mesenchymal stem cells alleviates coxsackievirus B3-induced cardiomyocyte ferroptosis via the SMAD2/ZFP36 signal axis
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Li, X., Hu, Y., Wu, Y. et al. Exosomal let-7a-5p derived from human umbilical cord mesenchymal stem cells alleviates coxsackievirus B3-induced cardiomyocyte ferroptosis via the SMAD2/ZFP36 signal axis. J. Zhejiang Univ. Sci. B 25, 422–437 (2024). https://doi.org/10.1631/jzus.B2300077
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DOI: https://doi.org/10.1631/jzus.B2300077
Key words
- Exosome
- Let-7a-5p
- Mothers against decapentaplegic homolog 2 (SMAD2)
- Coxsackievirus B3 (CVB3)
- Ferroptosis