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Insamjungchuntang has been used in Korea for many centuries as a treatment for respiratory disease. The effect of Insamjungchuntang on tracheal smooth muscle is not known. The purpose of the present study is to determine the effect of Insamjungchuntang on histamine and acetylcholine induced tracheal smooth muscle contraction in rats and guinea pigs. Guinea pig (500 g, male) and Sprague Dawley rats (200 g, male) were killed by exposure and a segment (8-10 mm) of the thoracic trachea from each rat and guinea pig was cut into equal segments and mounted ’in pairs’ in a tissue bath. Contractile force was measured with force displacement transducers under 0.5 g loading tension. The dose of histamine (His) and acetylcholine (Ach) which evoked 50% of maximal response was obtained from cumulative dose response curves for histamine and acetylcholine. Contractions evoked by His () and Ach were inhibited significantly by Insamjungchuntang. In guinea pig tracheal smooth muscle, the mean percent inhibition of acetylcholine induced contraction was 38.58(p<0.05);after;10{mu}l/ml Insamjungchuntang, 90.75(p<0.01);after;30{mu}l/ml. Insamjungchuntang and 133.17(p<0.01);after;100{mu}l/ml Insamjungchuntang. In rat tracheal smooth muscle, the mean percent inhibition of acetylcholine induced contraction was 10.0(p<0.05);after;10{mu}l/ml Insamjungchuntang, 80.71(p<0.01);after;30{mu}/ml Insamjungchuntang and 118.29(p<0.01);after;100{mu}l/ml Insamjungchuntang. Also, in guinea pig tracheal smooth muscle, the mean percent inhibition of histamine induced contraction was 45.5(p<0.01);after;10{mu}l/ml lnsamjungchuntang, and 93.17(p<0.01);after;30{mu}l/ml. lnsamjungchuntang 134.50(p<0.01);after;100{mu}l/ml Insamjungchuntang. In rat tracheal smooth muscle, the mean percent inhibition of histamine induced contraction was 37.83(p<0.01);after;10{mu}l/ml lnsamjungchuntang, 90.5(p<0.01);after;30{mu}l/ml Insamjungchuntang and 135.17(p<0.01);after;100{mu}l/ml Insamjungchuntang. Propranolol slightly but significantly attenuated the inhibitory effects of Insamjungchuntang. Following treatment with propranolol, the mean percent inhibition caused by . Insamjungchuntang fell to 46.42% in guinea pig induced by acetylcholine contraction and by Insamjungchuntang fell to 5.43% (p<0.05) in rat induced by acetylcholine contraction and the mean percent inhibition caused by Insamjungchuntang fell to 49.0% in guinea pig induced by histamine contraction and by Insamjungchuntang fell to 48.6% (p<0.05) in rat induced by histamine contraction. Indomethacin and methylene blue did not significantly alter the inhibitory effect of lnsamjungchuntang. Also, I could find the effects of lnsamjungchuntang and Insamjungchuntanggamorphine on the tracheal smooth muscle in guinea pig and rat did not change significantly. These results indicate that Insamjungchuntang can relax histamine and acetylcholine-induced contraction of guinea pig and rat tracheal smooth muscle, and that this inhibition involves sympathetic effects.
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