期刊
THERANOSTICS
卷 9, 期 7, 页码 1878-1892出版社
IVYSPRING INT PUBL
DOI: 10.7150/thno.29682
关键词
crystalline silica; dioscin; macrophage; autophagy; mitochondrial dysfunction
资金
- National Natural Science Foundation of China [81872592]
- Program for Liaoning Innovative Research Team in University [LT2015028]
Occupational exposure to crystalline silica (CS) particles leads to silicosis, which is characterized by chronic inflammation and abnormal tissue repair. Alveolar macrophages (AMs) play a crucial role in the process of silicosis. Previously, we demonstrated positive effect of dioscin on silicosis through modulating macrophage-elicited innate immune response. However, the concrete molecular mechanism remains to be discovered. Methods: We established experimental model of silicosis with wildtype and Atg5(flox/flox)Dppa3(Cre/+) mice and oral administrated dioscin daily to explore the effects of dioscin on macrophages and pulmonary fibrosis. AM cell line MH-S with Atg5 silence was used to explore specific function of dioscin on macrophage-derived inflammation and the underlying molecular mechanism. Results: Dioscin could promote autophagy in macrophages. Dioscin-triggered AMs autophagy limited mitochondrial reactive oxygen species (mtROS) mass stimulated by CS, reduced mitochondria-dependent apoptosis pathway activation and facilitated cell survival. Relieved oxidative stress resulted in decreased secretion of inflammatory factors and chemokines. Dioscin treatment alleviated macrophage-derived inflammation and subsequent abnormal collagen repair. All the dioscin's protective effects were diminished in Atg5(flox/flox)Dppa3(Cre/+) mice. Conclusion: Dioscin promoting autophagy leads to reduced CS-induced mitochondria-dependent apoptosis and cytokine production in AMs, which may provide concrete molecular mechanism for the therapy of silicosis.
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