Abstract
1. Alveolar rabbit macrophages were studied for superoxide and nitric oxide production at basal levels and upon stimulation with phorbol myristate acetate (PMA), zymosan, cytokines (two types of interferon), and lipopolysaccharide in the presence (or absence) of β-endorphin or hydroxylamine or both. 2. β-Endorphin diminished (statistically significant at concentration of 10 −8 M) superoxide production by PMA-stimulated macrophages but augmented reactive oxygen generation (10 −12 M β-endorphin) by zymosan-activated cells. 3. In the presence of hydroxylamine, β-endorphin had a visible (albeit not statistically significant) suppressive effect on nitrite production by PMA-activated cells. 4. Cytokine-stimulated macrophages enhanced nitric oxide production in the presence of hydroxylamine and β-endorphin in culture supernatants. 5. β-Endorphin exerted different modulatory effects on the production of reactive oxygen and nitrite intermediates by rabbit alveolar macrophages (suppression or enhancement) that was strictly dependent on the method of cell activation.
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