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Mosaic pattern: lung functional heterogeneity at the alveolus level.

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    Real-time tracking of inhaled particles in lungs revealed a unique "mosaic" pattern of aerosol deposition in specific alveolar clusters. This finding has implications for understanding lung development, disease, and therapeutic delivery.

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    Area of Science:

    • Pulmonary science
    • Biophysics
    • Aerosol science

    Background:

    • Tracking inhaled particle transport in functional alveoli is crucial for public health but remains challenging.
    • Inhaled particles include pathogens, pollutants (microplastics, smoke), therapeutics, and diagnostics.

    Purpose of the Study:

    • To investigate real-time aerosol transport and deposition in functional alveoli using a novel crystal ribcage technology.
    • To characterize the spatial distribution patterns of inhaled particles within the alveoli.

    Main Methods:

    • Utilized the crystal ribcage for real-time observation of aerosol transport in ex vivo ventilated lungs.
    • Analyzed single aerosol droplet transport and deposition at the alveolar level.
    • Examined particle distribution across various aerosol types, species (murine, porcine, human), and ages.

    Main Results:

    • Discovered a deterministic "mosaic" pattern of aerosol deposition, with particles accumulating in specific alveolar clusters.
    • Observed consistent mosaic pattern across different ventilation methods, aerosol types, species, and lung ages.
    • Post-deposition particle stability varied from minutes to days based on particle type and lung age.

    Conclusions:

    • Alveolar deposition exhibits significant heterogeneity, forming a reproducible mosaic pattern.
    • This mosaic pattern may underlie unrecognized biological and immunological variations in the lungs.
    • Findings impact understanding of lung development, susceptibility to airborne hazards, and inhaled therapeutic efficacy in respiratory diseases.