Variability and consistency in lung inflammatory responses to particles with a geogenic origin

Authors

  • Graeme R. Zosky,

    Corresponding author
    1. Telethon Institute for Child Health Research, The University of Western Australia, Perth, Western Australia
    2. Centre for Child Health Research, The University of Western Australia, Perth, Western Australia
    3. Cooperative Research Centre for Asthma and Airways, Sydney, New South Wales, Australia
    • Correspondence: Graeme Robert Zosky, Telethon Institute for Child Health Research, 100 Roberts Road, Subiaco, WA 6008, Australia. Email: graemez@ichr.uwa.edu.au

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  • Catherine E. Boylen,

    1. Telethon Institute for Child Health Research, The University of Western Australia, Perth, Western Australia
    2. Centre for Child Health Research, The University of Western Australia, Perth, Western Australia
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  • Russell S. Wong,

    1. Telethon Institute for Child Health Research, The University of Western Australia, Perth, Western Australia
    2. Centre for Child Health Research, The University of Western Australia, Perth, Western Australia
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  • Michael N. Smirk,

    1. School of Earth and Environment, The University of Western Australia, Perth, Western Australia
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  • Lucia Gutiérrez,

    1. School of Physics, The University of Western Australia, Perth, Western Australia
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  • Robert C. Woodward,

    1. School of Physics, The University of Western Australia, Perth, Western Australia
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  • W. Shan Siah,

    1. School of Population Health, The University of Western Australia, Perth, Western Australia
    2. Cooperative Research Centre for Asthma and Airways, Sydney, New South Wales, Australia
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  • Brian Devine,

    1. School of Population Health, The University of Western Australia, Perth, Western Australia
    2. Cooperative Research Centre for Asthma and Airways, Sydney, New South Wales, Australia
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  • Fiona Maley,

    1. School of Population Health, The University of Western Australia, Perth, Western Australia
    2. Cooperative Research Centre for Asthma and Airways, Sydney, New South Wales, Australia
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  • Angus Cook

    1. School of Population Health, The University of Western Australia, Perth, Western Australia
    2. Cooperative Research Centre for Asthma and Airways, Sydney, New South Wales, Australia
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  • (Associate Editor: Yuanlin Song).

Abstract

Background and objective

Particulate matter <10 μm (PM10) is well recognized as being an important driver of respiratory health; however, the impact of PM10 of geogenic origin on inflammatory responses in the lung is poorly understood. This study aimed to assess the lung inflammatory response to community sampled geogenic PM10.

Methods

This was achieved by collecting earth material from two regional communities in Western Australia (Kalgoorlie-Boulder and Newman), extracting the PM10 fraction and exposing mice by intranasal instillation to these particles. The physicochemical characteristics of the particles were assessed and lung inflammatory responses were compared to control particles. The primary outcomes were cellular influx and cytokine production in the lungs of the exposed mice.

Results

The physical and chemical characteristics of the PM10 from Kalgoorlie and Newman differed with the latter having a higher concentration of Fe and a larger median diameter. Control particles (2.5 μm polystyrene) caused a significant influx of inflammatory cells (neutrophils) with little production of proinflammatory cytokines. In contrast, the geogenic particles induced the production of MIP-2, IL-6 and a significant influx of neutrophils. Qualitatively, the response following exposure to particles from Kalgoorlie and Newman were consistent; however, the magnitude of the response was substantially higher in the mice exposed to particles from Newman.

Conclusions

The unique physicochemical characteristics of geogenic particles induced a proinflammatory response in the lung. These data suggest that particle composition should be considered when setting community standards for PM exposure, particularly in areas exposed to high geogenic particulate loads.

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