Hydrogen Plus Tetrandrine Reduces Lung Scarring from Silica Exposure
- Authors
- Juan Li, Ping Cui, Hua Jing, Shangya Chen, Li Ma, Wanxin Zhang, Tian Wang, Jiazi Ma, Mao Cao, Yong Yang, Bai Jin, Hua Shao, Zhongjun Du
- Journal
- International Immunopharmacology
- Year
- 2024
- DOI
- 10.1016/j.intimp.2024.112563
- Study Type
- Rat
- Outcome
- Positive
- Peer Reviewed
- Yes
- Country
- China
- Health Condition
- Silicosis
- Body System
- Respiratory
TL;DR
A combination of hydrogen gas and the compound tetrandrine significantly reduced lung damage and inflammation in rats with a lung disease caused by inhaling silica dust.
Key Finding
In rats with silica-induced lung damage, hydrogen gas combined with tetrandrine significantly reduced lung scarring and inflammation by suppressing specific cellular signaling pathways (NF-κB/NLRP3).
Summary
Researchers gave rats exposed to silica dust a combination of hydrogen gas and tetrandrine (a plant-derived compound) to test whether it could reduce lung scarring (fibrosis). The treatment reduced inflammation markers, decreased proteins associated with tissue scarring, and increased proteins that maintain normal lung cell structure. The researchers believe hydrogen and tetrandrine work by blocking specific cellular signaling pathways that trigger inflammation and tissue damage.
Practical Takeaway
This is an early-stage animal study showing promise for hydrogen as part of a combination therapy for silicosis, a serious occupational lung disease. However, the study was conducted only in rats and did not measure actual lung function, so it's far too early to draw conclusions about human effectiveness. Much more research, including human trials, would be needed before any clinical recommendations could be made.
Abstract
Silicosis is a progressive disease characterized by interstitial fibrosis resulting from inhalation of silica particles, and currently lacks specific treatment. Hydrogen (H2) has demonstrated antioxidative, anti-inflammatory, and anti-fibrotic properties, yet its efficacy in treating silicosis remains unexplored. In this study, rats exposed to silica were administered interventions of H2 combined with tetrandrine, and euthanized at 14, 28, and 56 days post-intervention. Lung tissues and serum samples were collected for analysis. Histological examination, MDA assay, enzyme-linked immunosorbent assay, hydroxyproline assay, and Western blotting were employed to assess the impact of H2 combined with tetrandrine on pulmonary fibrosis. The results revealed that this combination significantly alleviated inflammation in silicosis-afflicted rats, effectively suppressed levels of MDA, TNF-α, and IL-1β expression, and inhibited epithelial-mesenchymal transition (EMT), thereby ameliorating pulmonary fibrosis. Notably, protein expression level of E-cadherin was increased，however protein expression levels of vimentin and α-SMA were reduced, and TGF-β were reduced, alongside a significant decrease in hydroxyproline content. Furthermore, H2 combined with tetrandrine downregulated protein expression of NF-κB p65, NF-κB p-p65, Caspase-1, ASC, and NLRP3. These findings substantiate the hypothesis that H2 combined with tetrandrine mitigates inflammation associated with silicosis and suppresses the EMT process to ameliorate fibrosis via the NF-κB/NLRP3 signaling pathway. However, the pressure of airway opening was not assessed in this study and dynamic readings of lung physiological function were not obtained, which is a major limitation of this study.