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Pulmonary response to polyurethane dust.

K L Stemmer, E Bingham, W Barkley

    Environmental Health Perspectives
    |June 1, 1975
    PubMed
    Summary
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    Exposure to polyurethane foam particles caused lung inflammation and fibrosis in rats. After 18 months, some rats developed tumors, indicating potential long-term respiratory risks from these materials.

    Area of Science:

    • Toxicology
    • Pulmonary Pathology
    • Materials Science

    Background:

    • Rigid polyurethane foam (PUF) is widely used, but its long-term effects on lung tissue are not fully understood.
    • Understanding the toxicological profile of PUF particles is crucial for occupational safety and environmental health.

    Purpose of the Study:

    • To investigate the morphological and pathological responses of rat lung tissue following intratracheal instillation of aged (PUF I) and freshly prepared (PUF II) rigid polyurethane foam particles.
    • To assess the temporal development of lung injury and potential tumorigenesis induced by PUF particle exposure.

    Main Methods:

    • Weanling and adult rats were intratracheally instilled with 5 mg of PUF I or PUF II particles.
    • Lung tissues were examined morphologically at serial time points post-exposure.

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  • Histopathological analysis was performed to identify inflammatory, fibrotic, and neoplastic changes.

    • Main Results:

    • Initial lung responses included inflammation and increased macrophage activity.
    • Progressive fibrosis was observed by 6 months post-exposure.
    • By 12 months, nodular scars and perifocal emphysema were evident.
    • Four rats exposed to PUF II developed papillary adenomas in major bronchi after 18 months.

    Conclusions:

    • Intratracheal exposure to polyurethane foam particles induces significant lung pathology in rats, including inflammation, fibrosis, and emphysema.
    • Long-term exposure to freshly prepared PUF particles may be associated with an increased risk of bronchial adenoma development.
    • These findings highlight the potential respiratory hazards of polyurethane foam particles and warrant further investigation into their long-term toxicological effects.