Yuan Yong, Wang Xiuqi, Xu Huaihuan, Liu Lanxiang, Liu Jichun, Lai Songqing, Huang Huang
Department of Cardiovascular Surgery, The First Affiliated Hospital, Jiangxi Medical College, Nanchang University, Nanchang, Jiangxi, China.
Department of Cardiovascular Surgery, the Second Affiliated Hospital, Jiangxi Medical College, Nanchang University, Nanchang, Jiangxi, China.
J Cell Mol Med. 2025 Jun;29(12):e70650. doi: 10.1111/jcmm.70650.
Ischaemic cardiomyopathy is becoming one of the most prevalent cardiovascular diseases among the global elderly population. However, the underlying molecular mechanisms remain incompletely understood. Our previous study demonstrated that VDAC1 plays a significant role in MI/RI. Furthermore, FTMT plays a pivotal role in iron metabolism. However, the precise molecular functions of VDAC1 and FTMT in MI/RI remain to be elucidated. In vitro H9c2 cells A/R and in vivo SD rat MI/RI models were constructed. The present study reports that VDAC1 levels were increased and FTMT levels were decreased in A/R. The overexpression of VDAC1 resulted in an exacerbation of the A/R-induced injury, characterised by an increase in oxidative stress, a reduction in the GSH/GSSG ratio, the formation of reactive oxygen species, elevated levels of lipid peroxidation, and the deposition of iron. In contrast, FTMT overexpression reversed these alterations and mitigated mitochondrial dysfunction by downregulating VDAC1, PTGS2 levels, upregulating GPX4 levels, inhibiting MPTP over-opening and stabilising MMP. Additionally, knockdown of VDAC1 alleviated A/R-induced ferroptosis. In vivo experiments showed that overexpression of FTMT improved cardiac function in rats, as evidenced by the reduction of MI/RI-induced serum CK-MB, LDH and Fe content and the shrinkage of myocardial infarction area. Moreover, HE, DHE staining and TEM observations showed that the overexpression of FTMT ameliorated MI/RI-induced myocardial tissue and mitochondrial damage. Furthermore, the overexpression of FTMT was found to inhibit MI/RI-induced ferroptosis. In general, our study is the first to demonstrate that FTMT overexpression alleviates ferroptosis and mitochondrial dysfunction by regulating VDAC1, thereby reducing MI/RI injury.
缺血性心肌病正成为全球老年人群中最普遍的心血管疾病之一。然而,其潜在的分子机制仍未完全明确。我们之前的研究表明,VDAC1在心肌梗死/再灌注损伤(MI/RI)中起重要作用。此外,线粒体铁蛋白(FTMT)在铁代谢中起关键作用。然而,VDAC1和FTMT在MI/RI中的确切分子功能仍有待阐明。构建了体外H9c2细胞缺氧/复氧(A/R)模型和体内SD大鼠MI/RI模型。本研究报道,在A/R模型中VDAC1水平升高而FTMT水平降低。VDAC1的过表达导致A/R诱导的损伤加剧,其特征为氧化应激增加、谷胱甘肽/氧化型谷胱甘肽(GSH/GSSG)比值降低、活性氧形成、脂质过氧化水平升高以及铁沉积。相反,FTMT过表达通过下调VDAC1、环氧化酶-2(PTGS2)水平,上调谷胱甘肽过氧化物酶4(GPX4)水平,抑制线粒体通透性转换孔(MPTP)过度开放并稳定线粒体膜电位(MMP),逆转了这些改变并减轻了线粒体功能障碍。此外,敲低VDAC1可减轻A/R诱导的铁死亡。体内实验表明,FTMT过表达改善了大鼠的心功能,表现为MI/RI诱导的血清肌酸激酶同工酶(CK-MB)、乳酸脱氢酶(LDH)和铁含量降低以及心肌梗死面积缩小。此外,苏木精-伊红(HE)染色、二氢乙啶(DHE)染色和透射电镜(TEM)观察表明,FTMT过表达改善了MI/RI诱导的心肌组织和线粒体损伤。此外,发现FTMT过表达可抑制MI/RI诱导的铁死亡。总的来说,我们的研究首次证明FTMT过表达通过调节VDAC1减轻铁死亡和线粒体功能障碍,从而减轻MI/RI损伤。
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