Comparison of berberine and its five analogues on cell viability and COX-2expression during glucose-oxygen deprivation and reperfusion in PC12 cells  

小檗碱及其类似物体外缺糖缺氧条件下对PC12细胞生存及其对COX-2抑制作用的比较（英文）

作　　者：庞雨浓 胡珺[1] 柴玉爽[1] 吴昊 王玉刚[1] 雷帆[1] 邢东明[1] 杜力军[1] 

机构地区：[1]清华大学教育部蛋白质科学重点实验室,生命科学学院医学院药物药理研究室,北京100084 [2]NGM生物制药公司

出　　处：《Journal of Chinese Pharmaceutical Sciences》2014年第9期617-625,共9页中国药学（英文版）

基　　金：National Natural Science Foundation of China(Grant No.81374006,81073092 and 90713043);the National S&T Major Special Project for New Drug R&D Program of China(Grant No.2012ZX09103-201-041,2012ZX09102-201-008 and 2011ZX09101-002-11)

摘　　要：Berberine, an isoquinoline alkaloid component of Rhizoma Coptidis has been demonstrated to be the key active ingredient involved in its protective effect against cerebral ischemia-reperfusion. However, the comparison among the analogues to the protective effect against oxygen and glucose deprivation/reoxygenation （OGD-R） was mediated by inhibition of cyclooxygenase-2 （COX-2） has never been reported. The aim of this study is to investigate the protective effect of berberine and its five analogues against OGD-R in PC 12 cells, as well as to determine whether the protective effect was regulated through COX-2. An established in vitro OGD-R model of PC12 cells by oxygen glucose deprivation of 4 h and reperfusion of 24 h was used in our study. After cells were treated with berberine or its five analogues, we examined the cell viability assay by 3-（4,5-dimethylthiazol-2-yl）-2,5- diphenyltetrazolium bromide （MTT） assay. Cells were also collected to determine the levels of mRNA and protein of COX-2 by real time PCR and Western blot. We found that berberine and its analogues improved the viability of PC12 cells against OGD-R. Whereas berberine and berberrubine presented stronger activity with the most effective dose of 0.31 lag/mL and the minimum effective doses of 0.02 and 0.04 gg/mL. Palmatine possessed potentially weaker protective effect. The mRNA level of COX-2 in cells treated with berberine, coptisine and epiberberine was decreased significantly. The protein level of COX-2 was significantly down-regulated in cells treated with berberine. Studies suggested the important role of methylenedioxy groups （R2 and R3） of berberine analogues in COX-2 inhibitory effect, and methylenedioxy groups （R2, R3, R9 and R10） in berberine analogues in binding affinity with COX-2. Substituted hydroxyl group at R9 did not affect the activity of berberine. In summary, our study illustrated the protective effects of berberine and its analogues in PCI2 cells against OGD-R and to elucidate the structure-activity relat本文对小檗碱及其5个类似物对体外缺糖缺氧再灌注PC12细胞的保护作用及其对COX-2的抑制作用进行了实验观察,并就它们的构效关系进行了分析。造模方法为缺糖缺氧4小时复灌24小时。以MTT法检测小檗碱及其类似物对细胞的保护作用。以实时定量PCR和Western blot方法检测COX-2的mRNA和蛋白的表达。结果表明,小檗碱及其类似物均能够对抗缺糖缺氧再灌所引起的细胞损伤、抑制COX-2的表达。小檗碱和小檗红碱作用最强,其最大有效剂量为0.31μg/mL,其最小有效剂量分别为0.02和0.04μg/mL。巴马汀作用较弱。R2和R3位的亚甲二氧基是小檗碱及其类似物的活性基团。而且R2,R3,R9和R10位的亚甲二氧基影响小檗碱及其类似物对COX-2的亲和力。R9位的羟基取代不影响其活性。

关 键 词：BERBERINE ANALOGUES COX-2 Structure-activity relationships 

分 类 号：R285[医药卫生—中药学]