人参皂苷Rg1抗黑质神经元凋亡的可能机制

目的研究人参皂苷Rg1抗1-甲基-4-苯基-1,2,3,6-四氢吡啶(1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine,MPTP)诱导的小鼠黑质神经元凋亡的作用及其机制。方法MPTP制备的帕金森病(Parkinson′s disease,PD)小鼠模型,经人参皂苷Rg1预处理后,用尼氏(Nissl)染色和TH组化染色观察黑质神经元的损害情况,借助TUNEL染色了解黑质神经元的凋亡情况,并用免疫组织化学方法检测黑质神经元caspase-3的活化以及iNOS和nNOS的表达情况。结果人参皂苷Rg1预处理能减少PD鼠模型黑质致密带Nissl阳性神经元和TH阳性神经元的脱失现象,降低黑质神经元TUNEL染色的阳性率。结论人参皂苷Rg1预处理对MPTP诱导的小鼠黑质神经元凋亡有明显的保护作用。     

人参皂苷Rg1可能通过抗氧化作用来保护帕金森病鼠黑质神经元

研究人参皂苷Rgl对1—甲基—4—苯基—1，2，3，6—四氢吡啶(1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine,MPTP)诱导的小鼠黑质神经元凋亡的抗氧化保护作用。方法：采用MPTP制备帕金森病(PD)小鼠模型，经人参皂苷Rg1预处理后，用尼氏(Nissl)染色和TH组化染色观察黑质神经元的存活情况，通过活化型Caspase3的免疫组化染色和TUNEL染色了解黑质神经元的凋亡情况，并用生化技术对黑质区域谷胱甘肽（GSH)浓度及超氧化物歧化酶(SOD)活力进行检测。结果：人参皂苷Rg1预处理能提高黑质区域GSH的浓度及降低SOD活力，相应地减少PD鼠黑质致密带Nissl阳性神经元和TH阳性神经元的脱失现象，使活化型Caspase3表达阳性细胞减少，降低黑质神经元TUNEL染色的阳性率。结论：人参皂苷Rg1可能对MPTP诱导的小鼠黑质神经元凋亡有抗氧化保护作用。     

艾地苯醌对帕金森病小鼠行为学改善的作用及其机制

目的 研究艾地苯醌对于1-甲基-4-苯基-1,2,3,6-四氢吡啶（MPTP）诱导的帕金森病小鼠行为学改善的作用及可能的机制。方法 将小鼠分为对照组,模型组,艾地苯醌高、低剂量组。除对照组外,其余组别连续1周注射20 mg·kg^-1的MPTP诱导小鼠帕金森病,低剂量组小鼠每日给予艾地苯醌5 mg·kg^-1,高剂量组小鼠每日给予艾地苯醌10 mg·kg^-1,模型组给予等体积的生理盐水,连续干预14 d,对照组小鼠常规饲养。小鼠行为学实验采用旷场实验、爬杆实验、转轮实验、游泳实验、悬挂实验。免疫组化法检测小鼠黑质酪氨酸羟化酶（tyrosine hydroxylase,TH）的表达,Nissl染色检测小鼠中脑蛋白合成能力,MDA、SOD试剂盒检测小鼠黑质氧化损伤的水平,TUNEL染色检测小鼠黑质神经元的凋亡,免疫荧光法检测小胶质细胞IBA-1的表达,Western blot检测小鼠黑质中Bax、Bcl-2、caspase-9的表达。RT-QPCR检测线粒体DNA拷贝数mt-ND1以及线粒体DNA复制关键转录因子POLG1、POLG2、TFAM的mRNA表达水平。ELISA法检测小鼠外周血中炎症因子IL-1β、TNF-α、IL-6的表达水平。结果 模型组小鼠的运动能力相比对照组显著下降,且平衡感受到严重影响。艾地苯醌干预后,小鼠行为学得到显著改善,相比模型组具有显著性差异（P<0.05）。相比对照组,模型组小鼠黑质中TH、SOD的表达显著下调（P<0.05）、神经元凋亡率和MDA、IBA-1的水平显著上调（P<0.05）,外周血中炎症因子IL-1β、TNF-α、IL-6的表达水平显著上调（P<0.05）,Bax、caspase-9表达上调,DNA拷贝数以及相关转录因子表达下调。与模型组相比,艾地苯醌可以提高黑质中TH和SOD的表达,下调黑质中神经元凋亡率、IBA-1的表达以及外周血炎症因子水平,下调凋亡相关蛋白Bax、caspase-9,上调Bcl-2的表达,提高DNA的拷贝数和相关转录因子的表达。结论 艾地苯醌可以改善帕金森病小鼠的行为学,其机制和抗氧化应激损伤、抑制线粒体凋亡信号、改善线粒体损伤有关。     

人参皂苷Rg1对小鼠急性肝损伤的保护作用

目的探究人参皂苷Rg1对对乙酰氨基酚(APAP)所致急性肝损伤的保护作用。方法实验小鼠分为8组,分别是对照组、模型组、阳性药NAC组(150 mg·kg~(-1))、人参皂苷Rg1不同剂量组(20,40,80,160和320 mg·kg~(-1)),每组10只,给药组按10 mg·kg~(-1)灌胃给予不同剂量的Rg1或NAC,模型组和给药组给予Rg1或NAC后1 h给予APAP,对照组给予等体积生理盐水。连续给予5 d(预防给药组8 d)。观察人参皂苷Rg1对急性肝损伤小鼠的肝功能和抗氧化水平的影响以及肝组织病理变化。结果与模型组相比,人参皂苷Rg1各剂量组能降低肝代谢酶AST,ALT,ALP和LDH的活力。在人参皂苷预防给药中,给予人参皂苷Rg1后,Nrf2入核程度明显增加,其中以Rg1 40 mg·kg~(-1),Keap1入核有相应改变;HO-1,NQO1和GCLC的表达有明显增强且呈剂量依赖性。在治疗给药实验中给予人参皂苷Rg1后,Nrf2入核明显增加,其中以Rg1 20,40和320 mg·kg~(-1)药效最优,Keap1入核有相应改变,GCLC的表达有明显的增加且呈剂量依赖性。HE染色病理切片显示,给药组肝细胞坏死得到改善且高剂量组改善更为显著。结论人参皂苷Rg1具有很好的降低APAP诱发的肝损伤作用,为进一步研究APAP解毒剂提供基本实验依据。     

人参皂苷Re对MPTP致帕金森病模型小鼠多巴胺能神经元的保护作用

目的研究人参皂苷Re对 1 甲基 4 苯基 1,2 ,3,6 四氢吡啶 (1 methy 4 phenyl 1,2 ,3,6 te trahydropyridine ,MPTP)诱致帕金森病模型小鼠多巴胺能神经元的保护作用及其可能机制。方法通过给C5 7BL小鼠皮下注射MPTP制备帕金森病 (parkinson’sdisease ,PD)模型 ,灌胃给予人参皂苷Re预处理后 ,运用逆转录 聚合酶链式反应 (RT PCR)、免疫组织化学染色以及图像分析等技术分别对纹状体前脑啡肽原 (preproenkephalin ,PPE)mRNA、前强啡肽原 (preprodynorphin ,PPD)mRNA的表达水平和黑质酪氨酸羟化酶 (TH)、γ 氨基丁酸 (GABA)免疫反应阳性神经元数目等多项指标进行考察。结果Re能使黑质致密部 (SNc)的TH阳性神经元和黑质网状部 (SNr)的GABA阳性神经元数目显著增多 ;Re高剂量预防组 (2 6mg·kg-1)PPD扩增产物较模型组显著增加 (P <0 0 5 ) ;Re预防组的PPE扩增产物与模型组比没有显著差异。结论人参皂苷Re对MPTP诱致帕金森病小鼠黑质多巴胺能神经元具有明显的保护作用 ,其作用可能与改变GABA能神经元以及PPDmRNA表达水平 ,从而调节PD中直接回路和间接回路的兴奋 抑制平衡有关     

人参皂苷Rg1对寡聚肽Aβ_(1-42)增加JNK活性及诱导凋亡的影响

目的在寡聚肽Aβ1-42诱导的神经元凋亡过程中,探讨人参皂苷Rg1的保护作用和可能机制;方法运用寡聚肽Aβ1-42来诱导原代培养的皮层神经元损害,把神经元分为空白对照组、Aβ组、sp600125与Aβ共同孵育组以及人参皂苷Rg1与Aβ共同孵育组,然后观察JNK、p-JNK、caspase-3活性和TUNEL细胞数的变化。结果寡聚肽Aβ1-42作用15 min,皮层神经元的JNK磷酸化水平明显增加;经过预先孵育24 h人参皂苷Rg1(2.5~10μmol·L-1)后,再与寡聚肽Aβ1-42共同孵育15 min,JNK磷酸化水平明显降低;寡聚肽Aβ1-42孵育24 h,caspase-3活性和TUNEL数明显升高;人参皂苷Rg1(10μmol·L-1)预处理24 h后,再与Aβ1-42共孵育24 h组中caspase-3和TUNEL阳性数目明显下降。结论人参皂苷Rg1可通过JNK通路减轻寡聚肽Aβ1-42诱导的神经元凋亡。     

人参皂苷Rg1对大鼠视神经损伤病理改变的实验研究

目的研究人参皂苷Rg1对大鼠视神经损伤的影响。方法制作大鼠视神经损伤模型,设置实验组和对照组,腹腔注射人参皂苷Rg1,10mg／kg,连续注射20d,取视神经损伤眼和对照眼球及球后视神经,HE染色、SABC法免疫组织化学染色：Bcl-2、Neurocan表达情况。结果HE染色显示健康大鼠视神经组织细胞和视神经损伤组形态学有差异。免疫化学提示视神经损伤后神经细胞凋亡明显增多,人参皂苷Rg1腹腔注射能够明显改善细胞凋亡情况。视神经损伤后神经纤维蛋白表达明显增多,可能部分与其改善细胞凋亡情况有关,但机制尚不清楚。结论人参皂苷Rg1对大鼠视神经损有保护作用。     

人参皂甙Rg3在体外对肝癌细胞生长和凋亡的影响

目的观察人参皂甙Rg3对肝癌Bel-7402细胞凋亡的影响及其可能机制。方法用不同浓度人参皂甙Rg3作用于肝癌Bel-7402细胞24～72 h后,MTT法检测细胞活力;荧光染色观察细胞核的形态学改变;流式细胞术检测细胞凋亡率;Western blot检测细胞caspase-3、Bcl-2和Bax的表达情况。结果人参皂甙Rg3对Bel-7402细胞的生长有明显的增殖抑制作用,呈浓度和时间依赖性。经荧光染色后可观察到典型的凋亡小体。细胞凋亡率明显增高,Bcl-2蛋白表达量逐渐降低,Caspase-3和Bax蛋白表达量逐渐增加,呈明显的浓度依赖性。结论人参皂甙Rg3能诱导体外培养的人肝癌Bel-7402细胞凋亡;下调Bc1-2和上调Bax表达,活化caspase-3是人参皂甙Rg3诱导Bel-7402细胞凋亡的可能机制之一。     

氢溴酸樟柳碱对抗大鼠急性脑缺血/再灌注损伤的作用机制研究

目的探讨氢溴酸樟柳碱对抗大鼠急性脑缺血/再灌注损伤的作用机制。方法体内实验采用线栓法制备大鼠大脑中动脉阻塞(MCAO)致脑缺血/再灌注损伤模型,氢溴酸樟柳碱尾静脉注射进行干预。HE染色评价脑组织一般病理学情况;尼氏染色评价脑组织健存神经元情况;检测脑组织匀浆过氧化氢酶(CAT)活性、脂质过氧化物(LPO)含量、乳酸脱氢酶(LDH)活性;采用Western blot技术检测脑组织Bax、Bcl-2、caspase-3、p-Akt等蛋白的表达。体外实验采用PC12细胞氧糖剥夺再灌注损伤模型(OGD-R),采用Western blot技术检测细胞内Bax、Bcl-2、caspase-3、p-Akt等蛋白的表达情况,对氢溴酸樟柳碱作用的信号通路进行确认。结果氢溴酸樟柳碱0.15 mg·kg~(-1)能明显降低MCAO模型大鼠一般病理学评分,提高存活神经元数目;氢溴酸樟柳碱0.3、0.15 mg·kg~(-1)能明显提高脑组织CAT活性,氢溴酸樟柳碱0.3 mg·kg~(-1)能明显降低LPO含量;氢溴酸樟柳碱1.2mg·kg~(-1)明显降低LDH活性;各剂量组均能明显降低促凋亡蛋白Bax的表达,提高Bcl-2/Bax比值,促进p-Akt表达,明显提高p-Akt/Akt比值,除氢溴酸樟柳碱0.15 mg·kg~(-1)剂量外,其余剂量均能明显提高抗凋亡蛋白Bcl-2的表达。体外实验结果显示,氢溴酸樟柳碱在25~100μmol·L~(-1)时能明显提高Bcl-2蛋白的表达,提高Bcl-2/Bax比值,在50μmol·L~(-1)剂量下能明显提高p-Akt/Akt的比值。结论氢溴酸樟柳碱对抗急性脑缺血/再灌注损伤大鼠的作用机制与抗氧化损伤及提高p-Akt的表达有关。     

SIRT3介导褪黑激素保护帕金森病多巴胺能神经元的作用机制

目的研究SIRT3在褪黑激素保护帕金森病(Parkinson’s disease,PD)多巴胺能神经元中的作用。方法48只小鼠随机分为对照组、模型组和治疗组,治疗组小鼠给予褪黑激素(10 mg·kg-1)和MPTP(30 mg·kg-1)腹腔注射,模型组小鼠给予MPTP腹腔注射,对照组小鼠同时给予等量生理盐水,褪黑激素连续给药14 d。采用免疫组化分析黑质TH、Iba-1表达情况,ELISA法检测中脑组织氧化应激指标(ROS、MDA、SOD)及炎症因子(TNF-α、IL-1β)水平,实时定量PCR分析SIRT3 mRNA水平,免疫荧光和Western blot检测蛋白表达情况。结果与对照组比较,模型组小鼠黑质TH表达减少、Iba-1表达增多,中脑组织氧化应激与炎症损伤明显增强,黑质SIRT3 mRNA和蛋白表达水平明显降低,SOD2蛋白表达减少,iNOS蛋白表达增多,组间比较差异均具有统计学意义( P <0.05)。治疗组小鼠经褪黑激素干预后,TH表达增多、Iba-1表达减少,氧化应激与炎症损伤明显减弱,SIRT3 mRNA和蛋白表达水平升高,SOD2蛋白表达上调,iNOS蛋白表达下调,与模型组比较,差异均具有统计学意义( P <0.05)。 结论 褪黑激素通过上调SIRT3表达抵抗PD多巴胺能神经元损伤,作用机制与其抑制小胶质细胞激活减轻氧化应激和炎症损伤有关。     

Possible mechanisms of the protection of ginsenoside Re against MPTP-induced apoptosis in substantia nigra neurons of Parkinson's disease mouse model

We have investigated the role of ginsenoside Re (Re) in preventing 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)-induced apoptosis of the substantia nigra neurons in the mouse model of Parkinson's disease (PD). C57BL mice have been administrated i.s.c. with MPTP to establish the PD model. Pretreatment groups were given different doses of Re (6.5, 13, 26 mg kg^-1) i.g. for 13 days. Transmission electron microscope (TEM), tyrosine hydroxythase (TH) immunostaining and TDT-mediated dUTP nick-end labeling (TUNEL) staining have been used to observe the damage of substantia nigral neurons. To measure the expression of inducible nitric oxide synthase (iNOS), Bcl-2, Bax protein and expression of Bcl-2, Bax gene, immunohistochemistry and in situ hybridization have been explored respectively. Western blot analysis has been performed with anti-caspase-3. Pretreatment with Re (13, 26 mg kg^-1) markedly increases TH-positive neurons and decreases the TUNEL-positive ratio compared with the MPTP model group. Furthermore, Re could enhance the expression of Bcl-2 protein and Bcl-2 mRNA, but reduce the expression of Bax, Bax mRNA, and iNOS, and weaken the cleavage of caspase-3. In summary, ginsenoside Re showed protection from MPTP-induced apoptosis in the PD model mouse nigral neurons and this effect may be attributable to upregulating the expression of Bcl-2 protein, downregulating the expression of Bax, and iNOS protein, and inhibiting the activation of caspase-3.     

益智仁挥发油抗帕金森模型小鼠黑质神经元凋亡的作用研究

目的:研究益智仁挥发油对帕金森(PD)模型小鼠黑质致密部尼氏小体、酪氨酸羟化酶(TH)表达的影响和神经元凋亡的对抗作用。方法:实验分为6组,即正常对照(等容生理盐水)、模型(等容生理盐水,ig生理盐水第6天起同时复制模型,连续7d,每天1次)、司来吉兰(10mg·kg-1,ig司来吉兰第4天起同时复制模型,连续7d,每天1次)和益智仁挥发油高、中、低剂量(2.5、0.833、0.278mL·kg-1,ig益智仁挥发油第6天起同时复制模型,连续7d,每天1次)组。ip1-甲基-4-苯基-1,2,3,6-四氢吡啶(MPTP)复制C57BL小鼠PD模型。采用尼氏染色法观察尼氏小体表达;SABC免疫组化染色法观察益智仁挥发油对TH表达的影响;TUNEL染色法检测黑质神经元凋亡。结果:与正常对照组比较,模型组小鼠黑质神经元的尼氏小体、TH表达阳性细胞数明显减少,神经元凋亡显著增加;与模型组比较,益智仁挥发油高、中剂量组小鼠黑质神经元内尼氏小体显著增多;益知仁挥发油高、中、低剂量组TH表达阳性细胞数显著增多,而凋亡细胞数量显著减少。结论:益智仁挥发油能对抗PD模型小鼠黑质神经元细胞凋亡。     

Astaxanthin protects against MPTP/MPP+-induced mitochondrial dysfunction and ROS production in vivo and in vitro

Astaxanthin (AST) is a powerful antioxidant that occurs naturally in a wide variety of living organisms. We have investigated the role of AST in preventing 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)-induced apoptosis of the substantia nigra (SN) neurons in the mouse model of Parkinson’s disease (PD) and 1-methyl-4-phenylpyridinium (MPP+)-induced cytotoxicity of SH-SY5Y human neuroblastoma cells. In in vitro study, AST inhibits MPP+-induced production of intracellular reactive oxygen species (ROS) and cytotoxicity in SH-SY5Y human neuroblastoma cells. Preincubation of AST (50 μM) significantly attenuates MPP+-induced oxidative damage. Furthermore, AST is able to enhance the expression of Bcl-2 protein but reduce the expression of α-synuclein and Bax, and suppress the cleavage of caspase-3. Our results suggest that the protective effects of AST on MPP+-induced apoptosis may be due to its anti-oxidative properties and anti-apoptotic activity via induction of expression of superoxide dismutase (SOD) and catalase and regulating the expression of Bcl-2 and Bax. Pretreatment with AST (30 mg/kg) markedly increases tyrosine hydroxylase (TH)-positive neurons and decreases the argyrophilic neurons compared with the MPTP model group. In summary, AST shows protection from MPP+/MPTP-induced apoptosis in the SH-SY5Y cells and PD model mouse SN neurons, and this effect may be attributable to upregulation of the expression of Bcl-2 protein, downregulation of the expression of Bax and α-synuclein, and inhibition of the activation of caspase-3. These data indicate that AST may provide a valuable therapeutic strategy for the treatment of progressive neurodegenerative disease such as Parkinson’s disease.     

Neuroprotection by tetrahydroxystilbene glucoside in the MPTP mouse model of Parkinson's disease

Our in vitro experiments suggested that tetrahydroxystilbene glucoside (TSG) affords a significant neuroprotective effect against MPP⁺-induced damage and apoptosis in PC12 cells though activation of the PI3K/Akt pathway. This study was aimed to investigate the potential neuroprotective effect of TSG in 1-methyl-4-phenyl-1,2,3,6-tetrahydropypridine (MPTP)-treated mouse model of Parkinson's disease (PD). We found that treatment of TSG protected dopaminergic neurons by preventing MPTP-induced decreases in substantia nigra tyrosine hydroxylase (TH)-positive cells and striatal dopaminergic transporter (DAT) protein levels. Furthermore, it was also associated with increasing striatal Akt and GSK3β phosphorylation, up-regulation of the Bcl-2/BAD ratio, and inhibition of the activation of caspase-9 and caspase-3. These results showed that TSG promoted dopamine neuron survival in vivo, the PI3K/Akt signaling pathway may have mediated the protection of TSG against MPTP, suggesting that TSG treatment might represent a neuroprotective treatment for PD.     

Ginsenoside Rg1 reduces MPTP-induced substantia nigra neuron loss by suppressing oxidative stress

AIM: To investigate the effect of ginsenoside Rg1, an effective ingredient from ginsenoside, on 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)-induced substantia nigra neuron lesion. METHODS: C57-BL mice were given MPTP to prepare Parkinson disease mice model. Different doses of Rg1 (5, 10, and 20 mg.kg(-1).d(-1)) or N-acetylcystein (NAC) (300 mg.kg(-1).d(-1)) were given 3 d prior to MPTP in the pretreatment groups. Glutathione (GSH) level and total superoxide dismutase (T-SOD) activity in substantia nigra were determined by spectrophotometry. Nissl staining, tyrosine hydroxylase immunostaining, and TUNEL labeling were used to observe the damage and apoptosis of nigral neurons. Western blot analysis was used to detect the phospho-JNK and phospho-c-Jun levels in midbrain homogenates. RESULTS: Pretreatments of C57-BL mice with different doses of Rg1 or NAC were found to protect against MPTP-induced substantia nigra neurons loss. Rg1 or NAC prevented GSH reduction and T-SOD activation in substantia nigra, and attenuated the phosphorylations of JNK and c-Jun following MPTP treatment. CONCLUSION: The antioxidant property of Rg1 along with the blocking of JNK signaling cascade might contribute to the neuroprotective effect of ginsenoside Rg1 against MPTP.     

维生素D对过氧化氢诱导MIN6细胞凋亡的保护作用

目的探讨维生素D(vitamin D,VitD)对过氧化氢(hydrogen peroxide,H 2O 2)诱导小鼠胰岛β细胞株MIN6细胞凋亡的保护作用及机制。方法VitD预处理后,用H 2O 2处理MIN6细胞,分别运用CCK-8法、Hoechst 33258荧光染色法、流式细胞术检测MIN6细胞增殖、形态及凋亡百分率。Western blot检测增殖与凋亡相关基因Bax、Bcl-2、Caspase-3以及Cleaved caspase-3的表达。结果H 2O 2呈时间和剂量依赖性抑制MIN6细胞增殖,诱导细胞凋亡,降低Bcl-2表达、增加Bax及Cleaved caspase-3表达,Bcl-2/Bax比值降低,Cleaved caspase-3/caspase-3比值增加;当用VitD预处理后,Bcl-2表达增加,Bax、Cleaved caspase-3表达降低,Bcl-2/Bax比值增加,Cleaved caspase-3/caspase-3比值降低,MIN6细胞活力增加。结论VitD预处理后,通过增加抗凋亡Bcl-2表达,降低促凋亡Bax和Cleaved caspase-3表达,减少由H 2O 2诱导的小鼠胰岛β细胞株MIN6细胞凋亡。     

Apoptotic molecules and MPTP-induced cell death

MPTP-induced neurotoxicity is one of the experimental models most commonly used to study the pathogenesis of Parkinson's disease (PD). MPTP administered in vivo to mice causes selective loss of dopaminergic neurons in the substantia nigra (SN), as in this disease. Cell death may be induced in vitro by MPP(+), the active metabolite of MPTP, when neuronal cell cultures are used. Biochemical mechanisms underlying cell death induced by MPTP/MPP(+) still remain to be clarified completely. This article reviews some recent findings linking the effects of MPTP/MPP(+) with molecules typically involved in apoptotic pathways. This type of research has made extensive use of genetically manipulated systems such as transgenic mice and transfected cell lines. Evidence has emerged to suggest that Bcl-2, Bax, JNK, and caspases are implicated in neurotoxic effects due to in vivo MPTP administration to mice. Different neuronal cell lines such as MN9D cells, SH-SY5Y cells, cerebellar granule neurons, cortical neurons, and GH3 cells were also tested to investigate the possible involvement of Bcl-2, Bax, and caspases in in vitro MPP(+)-induced neurotoxicity.     

氧化槐果碱对胃癌MGC80-3细胞增殖和凋亡的影响

目的 观察氧化槐果碱对胃癌MGC80-3细胞增殖和凋亡的影响及机制。方法 采用CCK-8、Hoechest 33342染色、倒置显微镜和流式细胞术测定氧化槐果碱干预后对细胞的增殖、凋亡的影响,qRT-PCR检测胃癌MGC80-3细胞中Bcl-2、Bax mRNA水平,Western blot法检测胃癌MGC80-3细胞中Bcl-2、Bax、cleaved caspase-3、cleaved caspase-9蛋白水平。结果 氧化槐果碱能抑制胃癌MGC80-3细胞增殖（P<0.05）,并具有时间和浓度依赖性。0.48,0.95,1.91 mmol·L^-1氧化槐果碱能诱导细胞凋亡（P<0.05）,凋亡抑制剂Z-DEVD-FMK能逆转氧化槐果碱的凋亡诱导作用,0.95,1.91 mmol·L^-1氧化槐果碱能上调Bax的mRNA水平,下调Bcl-2的mRNA水平,差异均有统计学意义（P<0.05）。0.95,1.91 mmol·L^-1氧化槐果碱能上调Bax、cleaved caspase-3、cleaved caspase-9的蛋白水平,下调Bcl-2蛋白水平,差异均有统计学意义（P<0.05或P<0.01）。凋亡抑制剂Z-DEVD-FMK能逆转氧化槐果碱对Bcl-2、Bax、cleaved caspase-3、cleaved caspase-9蛋白的影响。结论 氧化槐果碱能通过调节Bcl-2、Bax、cleaved caspase-3、cleaved caspase-9的表达水平,抑制胃癌MGC80-3细胞增殖,诱导细胞凋亡。     

双去甲氧基姜黄素对小鼠乳腺癌的抗肿瘤作用及机制

目的　本研究旨在研究双去甲氧基姜黄素（bisdesmethoxycurcumin,BDMC）对小鼠乳腺癌的影响及机制。方法　采用小鼠乳腺癌4T1细胞,分为Control组及不同剂量（3、9、27 μM）BDMC组,通过CCK8法检测BDMC对小鼠乳腺癌4T1细胞增殖的影响,TUNEL染色检测BDMC对4T1细胞凋亡的影响,Western blot检测BDMC对4T1细胞Bax、Bcl-2及cleaved caspase-3表达的影响;采用4T1乳腺癌荷瘤小鼠模型,分为Control组及不同剂量（10、30 mg/kg）BDMC组,检测BDMC对小鼠肿瘤体积及体质量的影响,Western blot检测BDMC对乳腺癌小鼠肿瘤组织Bax、Bcl-2及cleaved caspase-3表达的影响。采用单因素方差分析。结果　与Control组相比,9、27 μM BDMC均能明显抑制4T1细胞增殖（均P<0.01）,促进其凋亡（均P<0.01）,同时上调细胞Bax/Bcl-2比值及cleaved caspase-3表达（均P<0.01）;10、30 mg/kg BDMC均能明显抑制乳腺癌小鼠肿瘤体积的增长（均P<0.05）,同时明显上调肿瘤组织Bax/Bcl-2比值及cleaved caspase-3表达（均P<0.05）,但对体质量无明显影响。结论　BDMC对乳腺癌小鼠模型具有明显的抗肿瘤作用,其机制与激活线粒体凋亡通路有关。