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Indomethacin and dexamethasone decrease oleic acid-induced pulmonary protein leak in rabbits.

R R Butler, K M Spicer

    Circulatory Shock
    |January 1, 1986
    PubMed
    Summary
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    Oleic acid (OA)-induced lung injury models ARDS. Indomethacin and dexamethasone combined treatments reduced OA-induced pulmonary protein leak, suggesting multiple factors contribute to lung injury.

    Area of Science:

    • Pulmonary Medicine
    • Pharmacology
    • Medical Imaging

    Background:

    • Oleic acid (OA)-induced lung injury models clinical adult respiratory distress syndrome (ARDS).
    • Pulmonary capillary protein leak is a hallmark of ARDS.
    • Understanding the mechanisms of OA-induced lung injury is crucial for developing effective treatments.

    Purpose of the Study:

    • To investigate the effects of indomethacin and dexamethasone on OA-induced pulmonary protein leak.
    • To evaluate the combined efficacy of indomethacin and dexamethasone in mitigating OA-induced lung injury.
    • To utilize technetium 99m (Tc-99m)-labeled human serum albumin (Tc-HSA) to quantify pulmonary protein leakage.

    Main Methods:

    • Utilized OA infusion in a preclinical model to induce lung injury.

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  • Employed dynamic gamma camera imaging with Tc-99m-labeled human serum albumin (Tc-HSA) to assess pulmonary capillary permeability.
  • Measured lung:heart activity ratio changes over time to quantify protein leak.
  • Administered indomethacin (prostaglandin synthetase inhibitor) and dexamethasone (corticosteroid) alone and in combination as pretreatment.

    • Main Results:

    • OA infusion caused significant pulmonary protein leakage, confirmed by Tc-HSA imaging.
    • Neither indomethacin nor dexamethasone alone significantly altered the OA-induced protein leak.
    • Combined pretreatment with indomethacin and dexamethasone significantly reduced pulmonary protein leak, but did not eliminate it.
    • Tc-99m labeling of red blood cells ruled out hemorrhage as the measured effect.

    Conclusions:

    • Multiple factors contribute to pulmonary capillary leak in OA-induced lung injury.
    • Combined nonsteroidal anti-inflammatory drugs and corticosteroids show potential therapeutic efficacy.
    • These agents can aid in defining the pathophysiology of permeability pulmonary edema.