Background: Huangqi-Danshen decoction (HDD) is a classic traditional Chinese medicine for treating heart failure. Pericardial adipose tissue (PAT) has recently gained increasing attention in cardiovascular diseases.
Purpose: This study aimed to investigate the effect of pericardial adipose tissue-derived extracellular vesicles on heart failure, the protective effect of HDD on myocardial remodel in heart failure rats, and identify the potential molecular mechanisms involved.
Methods: UPLC-MS/MS identified active components of HDD. Extracellular vesicles (EVs) from pericardial adipose tissue of sham-operated and HF rats were identified through transmission electron microscopy, nanoparticle tracking analysis and western blot. EVs were co-cultured with H9c2 cardiomyocytes in order to examine their uptake and effects. MicroRNA sequencing, dual-luciferase reporter assay and PCR were conducted for exploring specific mechanisms of EVs on hypertrophic cardiomyocytes. In vivo, heart failure was modeled in rats via transverse aortic constriction (TAC). In vitro, the hypertrophic cardiomyocyte model were established using Ang II-induced H9c2 cardiomyocytes.
Results: UPLC-MS/MS identified 11 active components in serum of HDD administrated rats. Echocardiography showed HDD improved cardiac function in TAC model rats. HE and Masson staining indicated HDD ameliorated myocardial hypertrophy and fibrosis. MicroRNA sequencing found that HDD treatment resulted in 37 differentially expressed miRNAs (DMEs) (p < 0.05 and |logFC| ≥ 1). KEGG analysis revealed that DEMs were enriched in the AMPK signaling pathway. PCR identified miR-27a-3p with the greatest difference in AMPK-related DMEs. Dual-luciferase reporter assay and Targetscan website were utilized to identify the target relationship between miR-27a-3p and PRKAA2 (AMPKα2). The miR-27a-3p negatively regulated AMPKα2 to inhibit mitophagy mediated by PINK1/Parkin pathway. HDD inhibited miR-27a-3p secretion from failing heart pericardial adipose tissue-derived extracellular vesicles, thereby improving inflammation, cardiac function, and myocardial remodeling through above pathways.
Conclusion: HDD inhibited the PAT-derived extracellular vesicular miR-27a-3p in failing hearts to activate AMPK/PINK1/Parkin signaling-mediated mitophagy, which improved cardiomyocyte energy metabolism, myocardial remodeling and heart failure.
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