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基于SIRT1/NRF2/HO-1信号探讨樱草杜鹃石油醚提取物抗痴呆的作用及机制
Study on the Anti-dementia Effect and Its Mechanism of Petroleum Ether Extract from Rhododendron Primulaeflorum Bur. Et Franch. Based on SIRT1/NRF2/HO-1 Signaling Pathway
【摘要】 目的 探讨樱草杜鹃石油醚提取物(RPE)对痴呆模型小鼠的学习记忆功能的影响及其潜在的作用机制。方法 根据体质量将小鼠随机分成空白组、模型组、安理申组(1.5 mg·kg-1)、RPE高(4.5 g·kg-1)和低(2.25 g·kg-1)剂量组,采用D-半乳糖(100 mg·kg-1)颈背部皮下注射制备痴呆模型,造模当天开始灌胃给药(10 mL·kg-1),连续给药30 d。采用Morris水迷宫评价小鼠学习记忆能力变化;苏木精-伊红染色观察小鼠海马病理形态学改变;免疫组化检测沉默信息调节因子2同源体1(SIRT1)的蛋白表达;Western Blot法分析核因子红细胞系2相关因子2(NRF2)、血红素加氧酶1(HO-1)、B细胞淋巴瘤/白血病-2基因(Bcl-2)、BCL2-相关X蛋白(Bax)和半胱氨酸蛋白酶3(Caspase-3)的蛋白表达;生化试剂盒检测血清和脑组织中超氧化物歧化酶(SOD)、谷胱甘肽(GSH)、过氧化氢酶(CAT)活性及过氧化氢(H2O2)和丙二醛(MDA)含量。结果 与空白组比较,模型组小鼠第5天的逃避潜伏期明显延长(P<0.01),空间探索实验进入平台次数明显减少(P<0.05);海马区神经细胞数量减少、排列紊乱,海马区和皮层均可见较多神经细胞变性或死亡且病理评分明显升高(P<0.01,P<0.001);血清和脑组织SOD、GSH和CAT活性均明显降低(P<0.05,P<0.001)而H2O2(血清)和MDA含量则均明显升高(P<0.05,P<0.001);SIRT1、NRF2、Bcl-2的蛋白表达均下调而Bax和Caspase-3的蛋白表达均上调(P<0.05,P<0.01)。与模型组比较,RPE可明显缩短模型小鼠第5天的逃避潜伏期(P<0.05),明显增加平台象限时间和进入平台次数(P<0.05,P<0.01,P<0.001);改善海马和皮层神经细胞病变及降低病理评分(P<0.05,P<0.01);明显提高模型小鼠血清和海马组织SOD、GSH和CAT活性(P<0.05,P<0.01,P<0.001)而降低H2O2(血清)和MDA含量(P<0.01,P<0.001);上调脑组织SIRT1、NRF2、HO-1、Bcl-2的蛋白表达(P<0.05,P<0.01,P<0.001)而下调Bax和Caspase-3的蛋白表达(P<0.05)。结论 樱草杜鹃石油醚提取物改善痴呆小鼠学习记忆能力可能与SIRT1/NRF2/HO-1抗氧化应激和细胞凋亡信号有关。
【Abstract】 ObjectiveTo investigate the effect of petroleum ether extract from Rhododendron primulaeflorum Bur. et Franch.(RPE) on learning and memory function in dementia mice and its potential mechanism.MethodsMice were randomly divided into blank group,model group,Aricept group(1.5 mg·kg-1),high-(4.5 g·kg-1)and lowdose RPE(2.25 g·kg-1)groups according to body mass index. Dementia models were prepared by subcutaneous injection of D-galactose(100 mg · kg-1) into the cervical dorsal region. All mice received corresponding drugs(10 mL·kg-1)by gavage on the first day of modeling,administered for 30 consecutive days. Morris water maze was used to evaluate the learning and memory ability of mice,the pathomorphological changes in hippocampus of mice were observed by hematoxylin eosin staining. The protein expression of silence information regulator 1(SIRT1)was detected by immunohistochemistry,while the protein expressions of nuclear factor erythrocyte line 2-related factor 2(NRF2),heme oxygenase 1(HO-1),B-cell lymphoma/leukemia 2(Bcl-2),BCL2-associated X protein(Bax)and cysteine proteinase-3(Caspase-3) were analyzed by Western Blot. The activity of superoxide dismutase(SOD),glutathione(GSH),catalase(CAT)and the content of hydrogen peroxide(H2O2)and malondialdehyde(MDA)in serum and brain were detected by biochemical kit.ResultsCompared with the blank group,the escape latency of mice in the model group was significantly prolonged on the fifth day(P<0.01) and the number of entering the platform in the space exploration experiment was significantly reduced(P<0.05). The number of neurons in the hippocampus decreased and the arrangement was disordered. Nerve cell degeneration and death in the cortex and hippocampus were found and their pathological score were significantly increased(P<0.01,P<0.001).The activities of SOD,GSH and CAT in serum and brain were significantly decreased(P< 0.05,P<0.001),while the content of H2O2(only in serum)and MDA were significantly increased(P<0.05,P<0.001). The protein expressions of SIRT1,NRF2 and Bcl-2 were down-regulated while the protein expressions of Bax and Caspase-3were up-regulated(P<0.05,P<0.01). Compared with the model group,RPE can significantly shorten the escape latency of the model mice on the fifth day(P<0.05),and significantly increase the time in the platform quadrant and the number of entering the platform(P<0.05,P<0.01,P<0.001). It also improved the pathological changes of nerve cell in hippocampus and cortex and decreased pathological score(P<0.05,P<0.01). The activities of SOD,GSH and CAT in serum and hippocampus of model mice were significantly increased(P<0.05,P<0.01,P<0.001) while the contents of H2O2(only in serum) and MDA were decreased(P<0.01, P<0.001). The protein expressions of SIRT1,NRF2,HO-1 and Bcl-2 were up-regulated in brain tissue(P<0.05,P<0.01,P<0.001) and the protein expressions of Bax and Caspase-3 were down-regulated(P<0.05, P<0.01, P<0.001).ConclusionRPE improves the learning and memory ability of dementia mice,which may be associated with SIRT1/NRF2/HO-1 related antioxidant stress and apoptosis signals.
【Key words】 Rhododendron primulaeflorumBur.et Franch; petroleum ether extract; dementia; oxidative stress; apoptosis; mice;
- 【文献出处】 中药新药与临床药理 ,Traditional Chinese Drug Research and Clinical Pharmacology , 编辑部邮箱 ,2023年03期
- 【分类号】R285.5
- 【下载频次】114