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Mechanistic insights into the treatment of pulmonary fibrosis with bioactive components from traditional chinese medicine via matrix stiffness-mediated EMT. | LitMetric

Mechanistic insights into the treatment of pulmonary fibrosis with bioactive components from traditional chinese medicine via matrix stiffness-mediated EMT.

Phytomedicine

Collaborative Innovation Center for Chinese Medicine and Respiratory Diseases Co-constructed by Henan Province & Education Ministry of P.R. China, Henan Key Laboratory of Chinese Medicine for Respiratory Disease, Academy of Chinese Medical Sciences, Henan University of Chinese Medicine, Zhengzhou 450000, China; Department of Respiratory Diseases, the First Affiliated Hospital of Henan University of Chinese Medicine, Zhengzhou 450000, China. Electronic address:

Published: November 2024

AI Article Synopsis

Article Abstract

Background: Idiopathic pulmonary fibrosis (IPF) is a progressive interstitial lung disease with limited therapeutic options. Our previous research has shown that the Jinshui Huanxian formula (JHF) is effective in treating IPF. However, the biomechanical mechanisms of its refined components, known as the effective-component compatibility of JHF II (ECC-JHF II), are not well understood.

Purpose: This study aims to explore how bioactive components from traditional Chinese medicine (TCM) impact the biomechanical progression of pulmonary fibrosis.

Study Design And Methods: A mouse model of pulmonary fibrosis was established by a single intratracheal instillation of bleomycin (Bleomycin). Pulmonary function, pathological changes, collagen deposition, lung tissue stiffness, and EMT markers were evaluated at the end of the study. Polyethylene glycol hydrogels with adjustable stiffness were used to mimic both normal and pathological lung conditions. The effects of ECC-JHF II on matrix stiffness-mediated EMT were assessed by quantitative real-time PCR, western blot, and immunofluorescence. The biomechanical mechanisms underlying ECC-JHF II on EMT and pulmonary fibrosis were verified both in vivo and in vitro.

Results: ECC-JHF II significantly improved bleomycin (Bleomycin)-induced pulmonary fibrosis in mice, manifested as increased tidal volume and 50 % tidal volume expiratory flow, reduced lung tissue stiffness, and decreased EMT markers. Histopathological analysis showed reduced inflammation, alveolar damage, and collagen deposition. In vitro, ECC-JHF II reversed the EMT phenotypic transition induced by substrate stiffness, demonstrated by the upregulation of E-cadherin, occludin, and zonula occluden-1, and the downregulation of N-cadherin, vimentin, caldesmon 1 and tropomyosin 1. Moreover, ECC-JHF II could inhibit integrin/ROCK/MRTF signaling in vitro and in vivo. Silencing integrin β1 or activating it with pyrintegrin further confirmed the role of integrin β1 in the mechanotransduction pathway and the efficacy of ECC-JHF II.

Conclusion: Taken together, the findings of this study indicate that ECC-JHF II exerts a therapeutic effect on pulmonary fibrosis through the attenuation of lung tissue stiffness and inhibition of EMT, potentially via the integrin/ROCK/MRTF signaling pathway.

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Source
http://dx.doi.org/10.1016/j.phymed.2024.156266DOI Listing

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