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Nitrogen dioxide-induced changes in cell membrane fluidity and function.

J M Patel, E R Block

    The American Review of Respiratory Disease
    |December 1, 1986
    PubMed
    Summary
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    Nitrogen dioxide (NO2) exposure alters lung endothelial cell membranes, reducing fluidity and impairing function. This oxidant injury increases lipid peroxidation and cell damage, contributing to NO2 toxicity.

    Area of Science:

    • Environmental toxicology
    • Cellular biology
    • Pulmonary medicine

    Background:

    • Nitrogen dioxide (NO2) is an oxidant pollutant toxic to lung cells.
    • NO2-induced pulmonary injury may involve lipid peroxidation in cell membranes.

    Purpose of the Study:

    • To evaluate the effects of NO2 exposure on endothelial cell membrane properties and function.
    • To investigate NO2's impact on membrane lipid fluidity, 5-hydroxytryptamine (5-HT) uptake, lactate dehydrogenase (LDH) release, and lipid peroxide formation.

    Main Methods:

    • Porcine pulmonary artery and aortic endothelial cells were exposed to 5 ppm NO2 for 3-24 hours.
    • Membrane fluidity was assessed using 1,6-diphenyl-1,3,5-hexatriene (DPH) and fluorescence spectroscopy.
    • 5-HT uptake, LDH release, and lipid peroxide formation were measured using established biochemical assays.

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    Main Results:

    • NO2 exposure significantly increased membrane rotational relaxation time (rhoDPH), indicating reduced membrane fluidity.
    • 24-hour NO2 exposure significantly decreased 5-HT uptake and increased LDH release and lipid peroxide formation.
    • These effects were observed in both pulmonary artery and aortic endothelial cells.

    Conclusions:

    • Oxidant injury from NO2 alters the physical state of endothelial cell membrane lipids.
    • NO2 exposure impairs endothelial cell membrane function, leading to biochemical and metabolic abnormalities.
    • These findings contribute to understanding NO2-induced lung injury mechanisms.