Abstract
1. We have compared some anti-inflammatory properties of formoterol, salbutamol and salmeterol in guinea-pig skin and lung. 2. Intradermal formoterol (1 x 10(-10) to 1 x 10(-8) mol/site), salbutamol (1 x 10(-8) and 1 x 10(-7) mol/site) and salmeterol (1 x 10(-8) and 1 x 10(-7) mol/site) inhibited bradykinin-induced plasma protein extravasation (PPE) in guinea-pig skin. A maximally effective dose of formoterol (1 x 10(-9) mol/site) and salbutamol (1 x 10(-8) mol/site) inhibited PPE in guinea-pig skin for 2-4 h and 1-2 h respectively, whereas salmeterol (1 x 10(-8) mol/site) was effective for > 6 h. 3. Inhaled formoterol (nebuliser concentration 0.1 to 100 micrograms ml-1 inhibited histamine-induced plasma protein extravasation (PPE) in guinea-pig lung, with significant inhibition being observed at 10 and 100 micrograms ml-1. Formoterol (100 micrograms ml-1) inhibited PPE in guinea-pig lung for 2-4 h, a duration of action intermediate between that previously obtained for salbutamol (1 h) and salmeterol (> 6 h). 4. Formoterol, like salbutamol, had no effect on neutrophil accumulation or granulocyte-dependent PPE (zymosan-induced) in guinea-pig skin. Formoterol inhibited neutrophil accumulation (lipopolysaccharide-induced) in guinea-pig lung but at doses greater than those required to inhibit granulocyte-independent PPE (histamine-induced). In contrast, salmeterol inhibited neutrophil accumulation and granulocyte-dependent PPE in guinea-pig skin and inhibited neutrophil accumulation in guinea-pig lung at doses which inhibit granulocyte-independent PPE.(ABSTRACT TRUNCATED AT 250 WORDS)
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