4.7 Article

Inhibition of gasdermin D-dependent pyroptosis attenuates the progression of silica-induced pulmonary inflammation and fibrosis

Journal

ACTA PHARMACEUTICA SINICA B
Volume 12, Issue 3, Pages 1213-1224

Publisher

INST MATERIA MEDICA, CHINESE ACAD MEDICAL SCIENCES
DOI: 10.1016/j.apsb.2021.10.006

Keywords

Silicosis; Gasdermin D; Pyroptosis; Macrophage; Pulmonary fibrosis

Funding

  1. Chinese Academy of Medical Sciences Innovation Fund for Medical Sciences (CIFMS, China) [2021-1-I2M-049, 2018-I2M-1-001]
  2. Non-profit Central Research Institute Fund of Chinese Academy of Medical Sciences, China [2019RC330001, 2021RC310002]
  3. National Natural Science Foundation of China [82090010]

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This study investigates the role of GSDMD-mediated pyroptosis in silicosis. The results demonstrate that GSDMD-dependent pyroptosis in macrophages is relevant to the progression of silicosis. Inhibiting this process could serve as a clinical strategy for mitigating silicosis.
Silicosis is a leading cause of occupational disease-related morbidity and mortality worldwide, but the molecular basis underlying its development remains unclear. An accumulating body of evidence supports gasdermin D (GSDMD)-mediated pyroptosis as a key component in the development of various pulmonary diseases. However, there is little experimental evidence connecting silicosis and GSDMD-driven pyroptosis. In this work, we investigated the role of GSDMD-mediated pyroptosis in silicosis. Single-cell RNA sequencing of healthy and silicosis human and murine lung tissues indicated that GSDMD-induced pyroptosis in macrophages was relevant to silicosis progression. Through microscopy we then observed morphological alterations of pyroptosis in macrophages treated with silica. Measurement of interleukin-1 beta release, lactic dehydrogenase activity, and real-time propidium iodide staining further revealed that silica induced pyroptosis of macrophages. Additionally, we verified that both canonical (caspase-l-mediated) and non-canonical (caspase-4/5/11-mediated) signaling pathways mediated silica-induced pyroptosis activation, in vivo and in vitro. Notably, Gsdmd knockout mice exhibited dramatically alleviated silicosis phenotypes, which highlighted the pivotal role of pyroptosis in this disease. Taken together, our results demonstrated that macrophages underwent GSDMD-dependent pyroptosis in silicosis and inhibition of this process could serve as a viable clinical strategy for mitigating silicosis. (C) 2022 Chinese Pharmaceutical Association and Institute of Materia Medica, Chinese Academy of Medical Sciences. Production and hosting by Elsevier B.V.

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