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Embolic pneumopathy induced by oleic acid. A systematic morphologic study

C M Derks, D Jacobovitz-Derks

    The American Journal of Pathology
    |April 1, 1977
    PubMed
    Summary
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    This study introduces a new model for pulmonary interstitial fibrosis using repeated oleic acid injections in dogs. The model effectively induces lung fibrosis, proving useful for pathological and physiological research.

    Area of Science:

    • Pulmonary Pathology
    • Animal Models
    • Fibrosis Research

    Background:

    • Acute and chronic pulmonary lesions can result from oleic acid exposure.
    • Developing reliable models for lung fibrosis is crucial for research.

    Purpose of the Study:

    • To systematically study acute and chronic pulmonary lesions induced by oleic acid.
    • To propose and validate a new model for pulmonary interstitial fibrosis using oleic acid injections.

    Main Methods:

    • Intravenous injections of oleic acid (0.045 or 0.09 g/kg) in adult dogs.
    • Morphological studies using light and electron microscopy and morphometry at various time points (hours to weeks).
    • Repeated weekly injections (0.09 g/kg) over 1-3 months to induce chronic fibrosis.

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    Main Results:

    • Early stages showed thrombosis and necrosis, followed by repair with Type 2 cell proliferation.
    • Lipid-laden macrophages were observed, indicating metabolic processes.
    • Pulmonary interstitial fibrosis was consistently observed in the late stages, with lesion extent correlating to injection frequency.

    Conclusions:

    • The proposed model of pulmonary interstitial fibrosis using repeated oleic acid injections is effective and reproducible.
    • The model is suitable for both pathologists and physiologists due to consistent fibrosis induction and low mortality.
    • This study provides insights into the stages of oleic acid-induced lung injury and repair.