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- W2012592382 abstract "Cantleyine, a monoterpene alkaloid isolated from the root bark of Strychnos trinervis, was submitted to a broad spectrum pharmacological screening, in which the principal effect observed was a nonspecific relaxation of isolated smooth muscles. Cantleyine relaxed (IC50 2.1 x 10(-4) M) the guinea-pig trachea, pre-contracted by carbachol and antagonized in a nonspecific manner; carbachol (IC50 2.1 x 10(-4) M) and histamine (IC50 1.4 x 10(-4) M) induced contractions in the guinea-pig ileum; and phenylephrine (IC50 3.8 x 10(-4) M) responses in the rat aorta. Cantleyine antagonized (pD'2, 3.82) cumulative concentration response curves to histamine in the ileum in a noncompetitive, reversible (slope, 4.84) and concentration dependent manner. The tonic contractions induced by histamine and KCl were also inhibited in a concentration-dependent and reversible manner (IC50 7.2 x 10(-5) and 1.8 x 10(-4) M, respectively), suggesting that cantleyine should be acting on voltage-dependent Ca2+ channels. This hypothesis was confirmed by the observation that cantleyine inhibited (pD'2, 3.35), in a concentration dependent manner, the CaCl2 induced contraction in depolarizing medium. These results suggest that cantleyine produces nonspecific spasmolytic effects in smooth muscle and that in guinea-pig ileum this effect is, in part, due to the inhibition of Ca+2 influx through voltage-dependent Ca2+ channels." @default.
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- W2012592382 date "1999-07-01" @default.
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- W2012592382 title "The monoterpene alkaloid cantleyine from Strychnos trinervis root and its spasmolytic properties" @default.
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- W2012592382 doi "https://doi.org/10.1016/s0944-7113(99)80005-1" @default.
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