Airway Inflammatory Responses to Organic Dust Exposure

Inhalation of organic dusts from agricultural and industrial settings evokes a complex airway inflammatory response characterised by the recruitment of innate immune cells, release of pro-inflammatory mediators and remodelling of the airway epithelium. Organic dust comprises particles laden with endotoxins, peptidoglycans, β-glucans and microbial antigens. Upon deposition in the respiratory tract, these components activate epithelial cells and resident macrophages via pattern recognition receptors, notably Toll-like receptors. The ensuing production of cytokines such as tumour necrosis factor-α, interleukin-6 and chemokines including CXCL1 and CXCL2 orchestrates a robust influx of neutrophils and other leukocytes. Repetitive or high-level exposures may lead to chronic neutrophilic inflammation, mucous cell metaplasia, airway hyperresponsiveness and impaired mucociliary clearance, culminating in conditions such as chronic bronchitis and occupational asthma. Emerging evidence highlights the dual role of the adaptor protein MyD88 in initiating acute inflammation and modulating adaptive resolution, with differential effects in epithelial and haematopoietic compartments. Adaptive responses following prolonged dust challenge may attenuate certain inflammatory pathways while exacerbating mucin overproduction. Understanding the interplay between innate signalling, epithelial integrity and repair mechanisms forms the basis for potential therapeutic interventions and preventive strategies in at-risk populations globally.

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Airway Inflammatory Responses to Organic Dust Exposure publication trend

The graph below shows the total number of articles in airway inflammatory responses to organic dust exposure across all publications each year (not limited to Nature Index journals).

Technical terms

Organic Dust Extract (ODE): A laboratory-prepared suspension containing microbial, plant and fungal components derived from agricultural environments, used to model inhalation exposures.

Neutrophil: A type of white blood cell and first responder in innate immunity, responsible for phagocytosis and release of proteolytic enzymes.

Cytokine: Small signalling proteins released by immune and epithelial cells that modulate inflammation and immune cell recruitment.

MyD88: Myeloid differentiation primary response 88; an intracellular adaptor protein essential for signalling downstream of most Toll-like receptors, mediating pro-inflammatory responses.

Bronchoalveolar Lavage (BAL): A sampling technique involving fluid instillation and recovery in the lower airways to collect cells and soluble mediators for analysis.

Mucin: High-molecular-weight glycoproteins produced by airway epithelial cells that contribute to mucus viscosity and trapping of inhaled particles.

References

1. Ovalbumin-sensitized mice have altered airway inflammation to agriculture organic dust. Respiratory Research (2019).
2. Post-Injury and Resolution Response to Repetitive Inhalation Exposure to Agricultural Organic Dust in Mice. Safety (2017).
3. MyD88 in lung resident cells governs airway inflammatory and pulmonary function responses to organic dust treatment. Respiratory Research (2015).
4. MyD88 regulates a prolonged adaptation response to environmental dust exposure-induced lung disease. Respiratory Research (2020).
5. Effect of epithelial-specific MyD88 signaling pathway on airway inflammatory response to organic dust exposure. Journal of Immunotoxicology (2022).