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The effects of synthetic leukotriene C-1 (LTC-1) on isolated guinea pig trachea and ileum have been determined and compared to histamine. LTC-1 produced a slow contraction of the trachea and the ileum with pD2 values of 8.7 +/- 0.1 (n = 14) and 8.5 +/- 0.1 (n = 13), respectively. In comparison, the pD2 values for histamine were 5.6 +/- 0.1 (n = 6) and 6.2 +/- 0.1 (n = 6), indicating LTC-1 was 2-3 orders of magnitude more potent. LTC-1 was antagonised by FPL 55712 with pA2 values of 6.9 +/- 0.1 (n = 5) and 6.4 +/- 0.1 (n = 7) on the trachea and ileum, respectively. Incubation with lipoxidase produced a time and enzyme dependent loss of biological activity and a concurrent shift in U.V. absorption spectrum.
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