Molecular mechanisms of dust-induced lung disease: exploring the role of physicochemical composition and cellular pathways

Our plain-English summary of Molecular mechanisms of dust-induced lung disease: exploring the role of physicochemical composition and cellular pathways, by Y. Sun, T.D. Waite (Particle and Fibre Toxicology, 2026).

The study

• Authors: Y. Sun, T.D. Waite
• Journal: Particle and Fibre Toxicology
• Published: 2026;23(1)
• Type of article: Review
• Read it: PubMed · Publisher · Free full text

Abstract

Background: Respirable dust and fibres in occupational settings are major contributors to lung dysfunction, imposing a significant societal burden. Following the ban on asbestos in most countries, silica and coal mine dust have emerged as primary concerns due to their abundance and persistence in workplace dust. Exposure to dust containing these elements has been strongly linked to pulmonary fibrosis and lung cancer.

Main Body: Extensive research has explored the molecular mechanisms underlying respirable occupational dust-induced cytotoxicity and immune dysregulation. The toxic effects of respirable occupational dust and fibres are largely induced by oxidative stress, mitochondrial dysfunction, lysosomal damage, inflammasome activation and immune suppression. These exposures can trigger multiple cell death pathways, including ferroptosis, necrosis, and pyroptosis. While sharing common toxicological features, silica, coal dust, and asbestos exhibit distinct toxic effects on various pulmonary cell types involved in fibrosis and cancer progression. The immunological consequences of dust exposure are profound, as dust-induced activation of macrophages and neutrophils, together with natural killer (NK) cell dysfunction, sustains chronic inflammation and disrupts epithelial repair and fibroblast regulation, thereby promoting fibrosis and tumorigenesis. Although no curative treatments exist for pulmonary fibrosis, especially coal workers' pneumoconiosis and silicosis, this review also discusses emerging therapeutic approaches, such as antifibrotic agents and immunotherapy, aimed at mitigating lung fibrosis and lung cancer.

Conclusion: This review summarises recent findings on the toxicological mechanisms underlying respirable occupational dust- and fibre-induced lung diseases, with a focus on crystalline silica, and coal dust and asbestos, especially those bearing reduced iron minerals. By highlighting both cellular toxicity and immunological effects, as well as potential therapeutic strategies, this work provides insights into current trends, challenges, and future research directions in the study of respirable occupational dust- and fibre-induced lung diseases.

© 2026. The Author(s).

In plain English

This review, not an original study, summarized published cell, animal and human research on how crystalline silica, coal mine dust and asbestos fibres damage the lungs. Fibres covered included chrysotile and amphiboles such as crocidolite and amosite. It described how particle size, shape, surface chemistry and iron content relate to injury. It attributed the greater toxicity of amphibole fibres to their biopersistence and very low solubility. It stated there is no evidence that asbestos releases iron from its crystal structure at levels with biological effects. It also described fibres gathering the body's own iron at their surface. It noted that dysfunction of natural killer (NK) immune cells has been observed in clinical and experimental asbestos studies. Citing the Global Burden of Disease Study, it reported 219,000 deaths (62.7%) attributed to asbestos among 2016 cancer deaths from occupational carcinogens. Treatments discussed included drugs proposed for silicosis and coal workers' pneumoconiosis. For lung cancer, they included surgery, radiation, chemotherapy, targeted therapy and immunotherapy. The authors concluded that particle composition and surface reactivity strongly influence disease potential. They cautioned that some evidence needs careful interpretation.

We wrote this plain-English summary from the full article with the help of AI, and a second AI model checked each sentence against the article. It is not the authors' wording; the abstract and the article are their own account.

What the study did and found

• Design: Narrative review of published in vitro, animal and human studies
• Who was studied: No study population; the review drew on previously published in vitro, animal and human studies
• Exposure: Respirable occupational dusts: crystalline silica (e.g. quartz), coal mine dust, and asbestos fibres (chrysotile and the amphiboles crocidolite, amosite, anthophyllite, tremolite and actinolite)
• Main results:
  • The review attributed the greater toxicity and biopersistence of amphibole asbestos fibres, compared with chrysotile, to their minimal solubility at the pH levels found in living systems
  • The review stated that there is no evidence that amphibole or chrysotile asbestos releases structural iron from the crystal lattice at levels that would have biological effects
  • The review described asbestos-related chronic inflammation as mechanistically linked to activation of NF-kB and the NLRP3 inflammasome, as with silica and coal dust
  • The review stated that the evidence on NK-cell dysfunction is most developed for asbestos, where it has been observed in clinical and experimental settings
  • Citing the Global Burden of Disease Study 2016, the review reported asbestos (219,000 deaths; 62.7%) and silica (48,000 deaths; 13.8%) as leading risk factors among cancer deaths from occupational carcinogens
  • The review described asbestos exposure as the primary occupational cause of malignant pleural mesothelioma
  • In its treatment section, the review reported that the antifibrotic drugs pirfenidone and nintedanib have been proposed for coal workers' pneumoconiosis and silicosis
  • For lung cancer, the review described surgery as the primary intervention for early-stage non-small cell lung cancer (NSCLC) and radiation therapy for patients who cannot have surgery or who have locally advanced disease
  • The review described platinum-based chemotherapy as a cornerstone of treatment for both NSCLC and small cell lung cancer (SCLC)
  • The review also discussed targeted therapies for specific genetic mutations in lung cancer
  • The review also discussed immunotherapy with immune checkpoint inhibitors for lung cancer
• The authors' conclusion: The authors concluded that disease potential is not set only by exposure intensity and duration but is strongly influenced by particle composition and surface reactivity. In their view, this supports a more composition-informed approach to exposure assessment and standard setting.
• Limitations the authors state:
  • The authors stated that mechanistic studies focused on neutrophils remain less extensive than work on macrophages
  • The authors cautioned that findings from model or engineered particles of well-defined shape should not be readily applied to real-world occupational dusts
  • The authors cautioned that results from iron-chelation studies should be interpreted carefully because chelators can have non-specific effects

Topics

Medical terms in this study, explained in our Lexicon: Pulmonary Fibrosis, Lung Cancer, Oxidative Stress, Necrosis, Fibrosis, Macrophage, Chronic Inflammation, Fibroblast.

Related studies

• Case report: Lung disease in World Trade Center responders exposed to dust and smoke: carbon nanotubes found in the lungs of World Trade Center patients and dust samples — M. Wu, R.E. Gordon, et al. (2010)
• Lung disease caused by inorganic and organic dust — G.W. Schepers (1963)
• Increased mineral dust-induced production of reactive oxygen species by blood monocytes from patients with malignant diseases — P.W. Nyberg, S.A. Nordman, et al. (1994)
• Plasma lipid peroxides among workers exposed to silica or asbestos dusts — A.A. Kamal, A. Gomaa, et al. (1989)
• Airway wall remodeling induced by occupational mineral dusts and air pollutant particles — A. Churg, J.L. Wright (2002)
• Cellular and molecular mechanisms of asbestos-induced fibrosis — R. Robledo, B. Mossman (1999)

Browse more research in Particle and Fibre Toxicology, or return to medical research.