Background: Pulmonary arterial hypertension is a complex vascular disease involving pathological remodeling of vascular cells, inflammatory cells, and the extracellular matrix. Current PAH therapies, which are primarily vasodilators, cannot reverse the disease pathogenesis or cure PAH. Novel therapeutic agents targeting the core process of vascular remodeling are desperately needed, and their mechanisms warrant systematic investigation.
Purpose: This study aimed to investigate the therapeutic potential of Huang-Qi-Si-Wu-Tang (HQSWT), a traditional Chinese herbal formula, in experimental models of PAH and to elucidate its underlying mechanisms.
Methods: We used monocrotaline-induced PAH in rats as an experimental model. We assessed the effect of HQSWT on disease prevention, as well as its effect in mitigating established disease. We employed RNA sequencing, integrated metabolomics and transcriptomics analysis, and validated findings by multiplex immunohistochemistry and quantitative PCR.
Results: HQSWT dose-dependently prevented monocrotaline-induced PAH development and mitigated established PAH, right ventricular hypertrophy, and pulmonary vascular remodeling. Transcriptomic analysis revealed HQSWT's action on extracellular matrix pathways, including Fn1 and Thbs2. Furthermore, we observed modulation of arachidonic acid metabolism via the ALOX5-LTB4 axis. HQSWT reduced ALOX5 expression in lung tissue and perivascular macrophages.
Conclusion: Our results demonstrate that HQSWT is effective in treating experimental PAH. Through omics analysis, we have identified a novel mechanism of action whereby HQSWT may exert its protective effects by simultaneously targeting the extracellular matrix and inflammation-mediated pulmonary vascular remodeling, suggesting its potential as a new therapy for PAH.
Keywords: Multi-target therapy; Pulmonary arterial hypertension; Traditional Chinese medicine formula; Vascular remodeling.
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