Analgesic and antispastic effects of protopine
Abstract
The root of dactylicapnos scandens (D. Don) Hutchins, Fumariaceae, has been used as an anodyne in China. Protopine was isolated from the root. The analgesic and anti-spastic effects of protopine are reported in this paper.
The oral LD50 of protopine was 186+/-33 mg/kg in mice. Assayed with the stretching method, the median analgesic dose (ED50) in mice was 27+/-5 mg/kg. The electric stimulation experiment showed that the effect of protopine was weaker than that of morphine. Protopine could inhibit the contraction of duodenum of rabbits at the concentration of 1*10(-5) g/ml. It could antagonize the spasm of isolated ileum of rats induced by acetylcholine or BaCl2.
Keywords:
The oral LD50 of protopine was 186+/-33 mg/kg in mice. Assayed with the stretching method, the median analgesic dose (ED50) in mice was 27+/-5 mg/kg. The electric stimulation experiment showed that the effect of protopine was weaker than that of morphine. Protopine could inhibit the contraction of duodenum of rabbits at the concentration of 1*10(-5) g/ml. It could antagonize the spasm of isolated ileum of rats induced by acetylcholine or BaCl2.