ABSTRACT
OBJECTIVE: To investigate the effect of lactuside B on CHOP mRNA expression in rat's cerebral cortex and hippocampus after cerebral ischemia injury. METHODS: Male SD rats of 280-320 g were randomly given brain ischemia-reperfusion treatment for 24 and 72 h respectively and then divided into sham operation group, model group, positive control group, and lactuside B 12.5 mg · kg-1 group, 25 mg · kg-1 group and 50 mg · kg-1 group. There were a total of 12 groups with 4 rats in each group. The cerebral ischemia-reperfusion model was established by cerebral artery occlusion for 2 h. The animals with neurological missing symptom scores of 1-3 were selected for the experiment. All the animals were intraperitoneally injected corresponding experimental drugs after reperfusion for 24 and 72 h and then sacrificed. RT-PCR was used to detected the expression of CHOP mRNA in the cerebral and hippocampus at different time. RESULTS: After cerebral ischemia-reperfusion injury for 24 and 72 h, the neurological deficits scores of the model group animals were significantly higher compared with the sham group (P < 0.01); the neurological deficit scores of the animals were decreased for positive control group and all lactuside B groups compared with model group (P < 0.01). All of the three dosage(12.5, 25 and 50 mg · kg-1) of lactuside B could reduce CHOP mRNA expression in cerebral cortex and hippocampus compared with the model group (P < 0.05, P < 0.01), and the majority of lactuside B groups were superior to the positive control drug nimodip-ine(P < 0.01). There was a good dose-effect relationship for lactuside B in general, but only the middle dose group showed good time-effect relationship. CONCLUSION: The results suggest that the anti-cerebral ischemia effect of lactuside B may be related with the down-regulation of CHOP mRNA expression in cortex and hippocampus. Lactuside B is worthy of development. Copyright 2013 by the Chinese Pharmaceutical Association.
ABSTRACT
Objective To investigate the major chemical composition in rhizome of Pterocypsela elata and explore the activity of lactuside B against brain ischemia.Methods The compounds were isolated and purified by silica gel column chromatography and elucidated by spectroscopic experiments;The model of partial brain ischemia was used to detect water content,MDA and SOD levels in brain tissue in order to observe the activity of lactuside B against brain ischemia.Results Ten compounds were obtained and established as lactuside B(1),11?,13-dihydrolactucin acetate(2),?-sitosterol(3),daucosterol(4),(24R)-5?-stigrnast-7,22(E)-dien-3?-ol(5),3,3',4-trimethoxylellagic acid(6),?-amyrin(7),oleanolic acid(8),n-hexacosanic acid(9),and stearic acid(10).Lactuside B was a key component,and it's yield was 0.15%.Contents of water and MDA level in the brain tissue were significantly decreased,and the SOD content notably increased in all groups of lactuside B.Conclusion Ten compounds are all isolated from this plant for the first time.Compound 1 is a key component which possesses obvious activity against brain ischemia.