Key Laboratory of Molecular Epidemiology of Hunan Province, Hunan Normal University, Changsha 410013, China.
Int J Mol Sci. 2021 Jan 5;22(1):453. doi: 10.3390/ijms22010453.
Silicosis is an urgent public health problem in many countries. Alveolar macrophage (AM) plays an important role in silicosis progression. Autophagy is a balanced mechanism for regulating the cycle of synthesis and degradation of cellular components. Our previous study has shown that silica engulfment results in lysosomal rupture, which may lead to the accumulation of autophagosomes in AMs of human silicosis. The excessive accumulation of autophagosomes may lead to apoptosis in AMs. Herein, we addressed some assumptions concerning the complex function of autophagy-related proteins on the silicosis pathogenesis. We also recapped the molecular mechanism of several critical proteins targeting macrophage autophagy in the process of silicosis fibrosis. Furthermore, we summarized several exogenous chemicals that may cause an aggravation or alleviation for silica-induced pulmonary fibrosis by regulating AM autophagy. For example, lipopolysaccharides or nicotine may have a detrimental effect combined together with silica dust via exacerbating the blockade of AM autophagic degradation. Simultaneously, some natural product ingredients such as atractylenolide III, dioscin, or trehalose may be the potential AM autophagy regulators, protecting against silicosis fibrosis. In conclusion, the deeper molecular mechanism of these autophagy targets should be explored in order to provide feasible clues for silicosis therapy in the clinical setting.
矽肺是许多国家亟待解决的公共卫生问题。肺泡巨噬细胞(AM)在矽肺进展中起着重要作用。自噬是一种平衡的细胞成分合成与降解的调节机制。我们之前的研究表明,二氧化硅吞噬作用导致溶酶体破裂,这可能导致 AM 中的自噬体积累。自噬体的过度积累可能导致 AM 凋亡。在此,我们针对自噬相关蛋白在矽肺发病机制中的复杂功能提出了一些假设。我们还总结了几种关键蛋白在矽肺纤维化过程中靶向巨噬细胞自噬的分子机制。此外,我们还总结了几种外源性化学物质,这些物质可能通过调节 AM 自噬来加重或减轻二氧化硅引起的肺纤维化,例如脂多糖或尼古丁可能会通过加重 AM 自噬降解的阻断作用而产生有害影响。同时,一些天然产物成分,如白术内酯 III、薯蓣皂素或海藻糖,可能是潜在的 AM 自噬调节剂,可预防矽肺纤维化。总之,为了在临床实践中为矽肺治疗提供可行的线索,应该深入探索这些自噬靶点的更深层次的分子机制。