Astragalus polysaccharide protects against cardiac injury in a tnnt2a mutant zebrafish model of dilated cardiomyopathy.

IF 3.3 2区 医学 Q1 INTEGRATIVE & COMPLEMENTARY MEDICINE
Chang Zhou, Hui Zhao, Longping Peng, Yidan Dong, Qiong Wu, Xu Wang, Yingjia Xu, Youhua Wang
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引用次数: 0

Abstract

Background: Dilated cardiomyopathy (DCM) is a severe and irreversible heart disease characterized by dilated ventricles and decreased myocardial function. DCM has a poor prognosis and a very low survival rate, with a 5-year mortality rate ranging from 15 to 50%, and is an important cause of sudden cardiac death and heart failure. Genetic factors play important roles in the pathogenesis of DCM. Mutations in the cardiac troponin T (tnnt2) gene represent an important subset of known pathogenic variants that bind to DCM. However, few specific drugs are currently available to treat DCM caused by these gene mutations. Astragalus polysaccharide (APS), the main active ingredient of Astragalus mongholicus Bunge (Huangqi), is widely used in China to treat cardiovascular diseases, including DCM. This study explored drugs for the treatment of DCM caused by tnnt2a mutation and revealed the protective effect of APS on tnnt2a-mutant dilated cardiomyopathy.

Methods: The tnnt2a-/- mutant zebrafish were used as a DCM model for comparison with the APS-treated group. The survival rate and the sinus venosus‒bulbus arteriosus (SV‒BA) distance were used to observe changes in cardiac output. Histopathological changes were observed via hematoxylin and eosin (HE) staining and TUNEL staining. The transcriptomes of the zebrafish in the DCM group and APS-treated group were investigated via RNA-seq. qRT‒PCR detection of apoptosis-related gene expression.

Results: We found that APS markedly increased the heart rate and ATP content, and significantly inhibited the level of cardiac tissue edema, which are essential for improving the survival rate of tnnt2a-/-. Furthermore, APS modulates key muscle fiber-related genes (including ttnb and myom3) and significantly impacts multiple signaling pathways, including Rap1, PI3K-Akt, Jak-STAT, and Wnt signaling. The qRT‒PCR results revealed that APS decreased the expression of bax, caspase-3, and caspase-9 but increased the expression of bcl-2 in DCM zebrafish.

Conclusions: Our findings suggest that APS can improve the survival rate in dilated cardiomyopathy and has a positive protective effect on the myocardium in the tnnt2a mutant zebrafish model of DCM.

黄芪多糖在tnnt2a突变斑马鱼扩张型心肌病模型中保护心脏免受损伤。
背景:扩张型心肌病(DCM)是一种以心室扩张和心肌功能下降为特征的严重且不可逆的心脏病。DCM预后差,生存率极低,5年死亡率为15% ~ 50%,是心源性猝死和心力衰竭的重要病因。遗传因素在DCM的发病机制中起重要作用。心肌肌钙蛋白T (tnnt2)基因突变是已知与DCM结合的致病变异的一个重要子集。然而,目前很少有特异性药物可用于治疗由这些基因突变引起的DCM。黄芪多糖(Astragalus多糖,APS)是黄芪的主要活性成分,在中国被广泛用于治疗心血管疾病,包括DCM。本研究探索治疗tnnt2a突变引起的DCM的药物,揭示APS对tnnt2a突变型扩张型心肌病的保护作用。方法:将tnnt2a-/-突变体斑马鱼作为DCM模型,与aps处理组进行比较。采用存活率和静脉-球动脉(SV-BA)距离观察心输出量变化。苏木精和伊红(HE)染色及TUNEL染色观察组织病理变化。采用RNA-seq方法研究DCM组和aps处理组斑马鱼的转录组。凋亡相关基因表达的qRT-PCR检测。结果:我们发现黄芪多糖显著提高了tnnt2a-/-小鼠的心率和ATP含量,显著抑制了心肌组织水肿水平,这是提高tnnt2a-/-小鼠存活率所必需的。此外,APS调节关键的肌纤维相关基因(包括ttnb和myom3),并显著影响多种信号通路,包括Rap1、PI3K-Akt、Jak-STAT和Wnt信号。qRT-PCR结果显示,APS降低了DCM斑马鱼bax、caspase-3和caspase-9的表达,增加了bcl-2的表达。结论:本研究提示黄芪多糖可提高扩张型心肌病的存活率,对tnnt2a突变型DCM斑马鱼模型心肌具有积极的保护作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
BMC Complementary Medicine and Therapies
BMC Complementary Medicine and Therapies INTEGRATIVE & COMPLEMENTARY MEDICINE-
CiteScore
6.10
自引率
2.60%
发文量
300
审稿时长
19 weeks
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