Abstract
The mechanical response of guinea pig tracheal smooth muscle to leukotriene (LT) B4, C4, D4 and E4 was investigated, and the effects of several agents on LT-induced contraction were determined. Agents used in the present study were: verapamil, a Ca-channel blocker; dibutyryl cyclic-AMP (DBcAMP); aminophylline; N-(6-aminohexyl)-5-chloro-1-naphthalenesulfonamide hydrochloride (W-7), a calmodulin antagonist; N-(6-aminohexyl)-1-naphthalene-sulfonamide hydrochloride (W-5), resembling W-7 in structure but without calmodulin antagonism. The results were as follows: 1) LTB4 had a contractile activity, dependent on the [Ca]o concentration; it was suppressed by a [Mg]o increase to 1.2 mM and over. Little effect was observed from other drugs. 2) Contractile activities of LTC4, D4 and E4 were dose-dependent, depending upon [Ca]o as well as LTB4. 3) Verapamil (5×10−6−10−3 M), DBcAMP (3×10−6−3×10−3 M) and aminophylline (3×10−8−3×10−3 M) suppressed LTs (C4, D4, and E4, 10−8 M)-induced contraction dose-dependently. However, W-7 and W-5 did not suppress LT-induced contraction. These results suggest that the LTC4-, D4-and E4-induced responses could be explained by the effect of LTC4, D4 and E4 on increasing Ca influx through the plasma membrane.
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Sasaki, T., Takagi, K., Satake, T. et al. Mechanism of leukotriene-induced contraction of isolated guinea pig tracheal smooth muscle. Lung 162, 369–380 (1984). https://doi.org/10.1007/BF02715669
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DOI: https://doi.org/10.1007/BF02715669