阿米洛利与白藜芦醇对肝缺血再灌注损伤的保护作用

目的探讨阿米洛利、白藜芦醇对大鼠肝脏缺鲥再灌注损伤的保护作用。方法取成年SD大鼠48只,随机分为假手术组、缺血再灌注组、不同剂量阿米洛利、白藜芦醇药物处理组。按Pringle法建立全肝缺彬再灌注模型。6h后取血,测定血清丙氨酸氨基转移酶（ALT）、天冬氨酸氨基转移酶（AST）活性和超氧化物歧化酶（SOD）、丙二醛（MDA）含量,并取肝叶制作冰冻切片,HE染色观察其组织形态。结果与假手术组相比,肝缺血／再灌注组大鼠血清中AST、AIJT活性增强,SOD活性下降,MDA含量增加。白藜芦醇和阿米洛利组与缺血／再灌组相比,肝脏功能损伤较轻．AST、ALT活性下降,SOD活性增强,MDA含量下降,且有剂量依赖性。白藜芦醇和阿米洛利纽病理损害较缺血再灌注组明显减轻。结论白藜芦醇与阿米洛利对肝缺血／再灌损伤有保护作用,对临床治疗缺血性肝损伤有潜在的应用价值。     

白藜芦醇诱导食管癌细胞凋亡及其相关基因表达的研究

目的研究白藜芦醇诱导人食管癌Eca109细胞凋亡的作用并探讨其对凋亡相关基因survivin、bax和bcl-2表达的影响。方法不同浓度白藜芦醇作用于Eca109细胞后,采用流式细胞仪检测细胞凋亡、细胞周期分布及survivin、bax和bcl-2蛋白的表达。结果白藜芦醇能诱导食管癌Eca109细胞凋亡,使其细胞周期阻滞在G0/G1期;白藜芦醇可以上调bax蛋白的表达,下调survivin蛋白并协同抑制bcl-2蛋白的表达。结论白藜芦醇能明显诱导Eca109细胞凋亡,其机制可能与促进bax表达、抑制survivin和bcl-2表达有关。     

白藜芦醇对人胰腺癌PANC-1细胞增殖与侵袭的影响

目的 探讨白藜芦醇对人胰腺癌PANC-1细胞增殖与侵袭能力的影响.方法 实验分为空白对照组,0.1%DMSO组,白藜芦醇组(50、100、200 μmol/L).MTT法检测白藜芦醇对细胞增殖的影响;流式细胞仪检测细胞凋亡及周期变化;Transwell侵袭小室检测白藜芦醇对细胞侵袭的影响;荧光实时定量PCR和Western blot检测白藜芦醇对细胞Bax、Bcl-2、MMP-2、MMP-9表达的影响.数据以-x±s表示,多组比较采用方差分析.结果 (1)空白对照组抑制率为0;0.1%DMSO组细胞抑制率为3.25%±0.42%;白藜芦醇50 μmol/L组细胞抑制率为13.23%±1.68%;白藜芦醇100μmol/L组细胞抑制率为42.25%±3.20%;白藜芦醇200μmol/L组细胞抑制率为56.94%±5.31%.各组比较,差异有统计学意义(F=460.10,P<0.05).(2)空白对照组细胞凋亡率为0.05%±0.03%;0.1%DMSO组细胞为凋亡率为3.39%±1.77%;白藜芦醇50 μmol/L组细胞凋亡率为6.92%±1.85%;白藜芦醇100 μmol/L组细胞凋亡率为19.05%±2.01%;白藜芦醇200 μmol/L组细胞凋亡率为27.17%±6.43%.各组比较,差异有统计学意义(F=38.84,P<0.05).(3)0.1%DMSO组对细胞周期无显著影响.白藜芦醇引起PANC-1细胞G0/G1期和S期阻滞,G2/M期细胞减少.(4)空白对照组平均穿膜细胞数为61±13;0.1%DMSO组为54±13;白藜芦醇50 μmol/L组为48±15;白藜芦醇100 μmol/L组为23±6;白藜芦醇200 μmol/L组为18±7.各组比较,差异有统计学意义(F=69.08,P<0.05).(5)白藜芦醇可使PANC-1细胞Bax表达升高,Bcl-2表达下调.MMP-2、MMP-9的表达明显受到抑制,mRNA和蛋白水平变化一致.结论 白藜芦醇可明显抑制胰腺癌PANC-1细胞增殖,诱导细胞凋亡并抑制其侵袭能力.     

核转录因子κB在大鼠肺纤维化中的表达及白藜芦醇干预作用

目的 观察核转录因子κB(NF-κB)在博莱霉素致大鼠肺纤维化中的表达及白藜芦醇(Res)干预作用.方法 90只雌性SD大鼠随机分为对照组、模型组、Res低(25 mg/kg)、中(50 mg/kg)、高(100 mg/kg)剂量组及地塞米松(DM,3 mg/kg)干预组,以气管内注入博莱霉素法制备肺纤维化大鼠模型,观...     

三氧化二砷与白藜芦醇联用对急性早幼粒细胞性白血病NB4细胞存活率的影响

目的 观察三氧化二砷(ATO)与白藜芦醇(Res)联用对人急性早幼粒细胞白血病细胞株NB4细胞存活率的影响,并探讨其作用机制.方法 采用不同剂量的ATO[0(对照)、0.1875、0.3750、0.7500、1.1250、1.5000、2.2500、3.0000、5.0000 μmol/L]、Res[0(对照)、1.5625、3.1250、6.2500、12.5000、18.7500、25.0000、37.5000、50.0000 μmol/L]孵育NB4细胞.应用四氮唑盐比色法(MTT)检测不同处理组的细胞存活率,计算ATO和Res对NB4细胞的半数抑制浓度(IC50).根据IC50,设置联合用药比例分别为1.5∶18、.5∶25、.5∶35,并根据药物联合指数计算公式,分别计算出联合用药在不同抑制效应(0.1、0.2、0.3、0.4、0.5、0.6、0.7、0.8、0.9)时的联合指数,判断ATO与Res在不同抑制效应时各自所需药物浓度之间的相互作用.应用DCFH-DA荧光探针检测对照组、ATO(1.5000 μmol/L)加药组、Res(25.0000 μmol/L)加药组、联合用药组(0.9000 μmol/L ATO+12.5000 μmol/L Res)NB4细胞活性氧(ROS)水平,每组各检测10份样品.结果 ①ATO(≥0.7500 μmol/L)加药组NB4细胞存活率明显低于对照组(P＜0.05),呈剂量依赖性的量效关系,IC50为(1.78±0.11)μmol/L.②Res(≥18.7500 μmol/L)加药组NB4细胞存活率明显低于对照组(P＜0.05),呈剂量依赖性的量效关系,IC50为(18.71±0.18)μmol/L.③ATO和Res联合应用对NB4细胞存活抑制效应呈现拮抗作用.④Res加药组NB4细胞内ROS水平(1670.55±13.97)明显低于对照组(2345.88±14.48,P＜0.05).ATO加药组NB4细胞内ROS水平(3092.42±94.84)明显高于对照组(P＜0.05).联合用药组NB4细胞内ROS水平(1860.27±15.99)明显低于ATO加药组(P＜0.05).结论 ATO、Res均可致NB4细胞存活率下降,而两者联合应用时表现为拮抗效应,ROS可能参与了这种拮抗作用.

Abstract：

Objective To investigated the effects of combined arsenic trioxide(ATO) and resveratrol(Res)on the viability of NB4 human leukemia cells. Methods NB4 human leukemia cell was used in this experiment.Cells were cultured in ATO (0,0.1875,0.3750,0.7500, 1.1250, 1.5000,2.2500,3.0000,5.0000 μmol/L) and Res (0, 1.5625,3.1250,6.2500, 12.5000, 18.7500,25.0000,37.5000,50.0000 μmol/L). Cell viabilities were measured by MTT in different treatment groups. Half inhibitory concentration(IC50) was calculated. The ratio of concentration of ATO and Res 1.5∶ 18,1.5∶ 25,1.5∶ 35 was added to cells, and the combination index(CI) was calculated. The level of ROS in control, ATO( 1.5000 μmol/L), Res(25.0000 μmol/L) and ATO(0.9000 μmol/L) + Res( 12.5000μmol/L) groups was measured by chemiluminescence assay. Results ①ATO( ≥0.7500 μmol/L) reduced the viability of NB4 cells in a concentration-dependent manner(P ＜ 0.05 ), and IC50 was (1.78 ± 0.11 )μmol/L. ②)Res (≥18.7500 μ mol/L) dose-dependently decreased the viability of NB4 cells (P ＜ 0.05 ), and IC50 was ( 18.71 ±0.18)μ mol/L. ③Combination of ATO and Res showed an antagonistic effect on NB4 cells viability. ④The ROS in Res group( 1670.55 ± 13.97) was significantly lower than that in control group(2345.88 ± 14.48,P ＜ 0.05). The ROS in ATO group (3092.42 ± 94.84) was significantly higher than that in control group(P ＜ 0.05). The ROS in ATO + Res group (1860.27 ± 15.99) was significantly lower than that in ATO group(P ＜ 0.05). Conclusions NB4 cell survival rate can be decreased by ATO and Res. The combination of arsenic trioxide and Res presents an antagonistic effect on NB4 cell viability, in part by reducing intracellular ROS formation.     

Graptopetalum paraguayense and resveratrol ameliorates carboxymethyllysine (CML)-induced pancreas dysfunction and hyperglycemia

Hyperglycemia is associated with advanced glycation end products (AGEs). Recently, AGEs were found to cause pancreatic damage, oxidative stress, and hyperglycemia through the AGE receptor. Carboxymethyllysine (CML) is an AGE but whether it induces pancreatic dysfunction remains unclear. Graptopetalum paraguayense, a vegetable consumed in Taiwan, has been used in folk medicine and is an antioxidant that protects against liver damage. We investigated the protective properties of G. paraguayense 95% ethanol extracts (GPEs) against CML-induced pancreatic damage. The results indicated that resveratrol, GPE, and gallic acid (the active compound of GPE) increased insulin synthesis via upregulation of pancreatic peroxisome proliferator activated-receptor-γ (PPARγ) and pancreatic-duodenal homeobox-1 (PDX-1) but inhibited the expression of CML-mediated CCAAT/enhancer binding protein-β (C/EBPβ), a negative regulator of insulin production. Moreover, resveratrol and GPE also strongly activated nuclear factor-erythroid 2-related factor 2 (Nrf2) to attenuate oxidative stress and improve insulin sensitivity in the liver and muscle of CML-injected C57BL/6 mice and resulted in reduced blood glucose levels. Taken together, these findings suggested that GPE and gallic acid could potentially be used as a food supplement to protect against pancreatic damage and the development of diabetes.     

Colon carcinogenesis: Influence of Western diet-induced obesity and targeting stem cells using dietary bioactive compounds

Colon cancer strikes more than 1 million people annually and is responsible for more than 500,000 cancer deaths worldwide. Recent evidence suggests that the majority of malignancies, including colon cancer are driven by cancer stem cells (CSCs) that are resistant to current chemotherapeutic approaches leading to cancer relapse. Wnt signaling plays a critical role in colon stem cell renewal and carcinogenesis. Leucine-rich repeat-containing G protein-coupled receptor 5 (LGR5), a Wnt target gene, and aldehyde dehydrogenase 1 B1 (ALDH1B1) are good markers for normal and malignant human colon stem cells. Diet contributes to 20% to 42% of all human cancers and 50% to 90% of colon cancer. Recent evidence shows that the Western diet has a causative link to colon cancer; however, mechanisms of action are not fully elucidated. Western diet-induced obesity elevates systemic insulin-like growth factor-1 and insulin levels, which could lead to elevated proliferation and suppressed apoptosis of CSCs through PI3K/AKT/Wnt pathway. Although conventional chemotherapy targets the PI3K/AKT pathways and can significantly reduce tumor size, it fails to eliminate CSCs and has serious side effects. Dietary bioactive compounds such as grape seed extract, curcumin, lycopene, and resveratrol have promising chemopreventive effects, without serious side effects on various types of cancers due to their direct and indirect actions on CSC self-renewal pathways such as the Wnt pathway. Understanding the role of CSCs in diet-induced colon cancer will aid in development of evidence-based dietary chemopreventive strategies and/or therapeutic agents targeting CSCs.     

白藜芦醇诱导MDA-MB-231细胞凋亡及其对活性氧和Caspase-3的影响

目的探讨白藜芦醇对MDA-MB-231细胞的凋亡诱导效应和对细胞内活性氧水平(reactive oxygen species,ROS)及Caspase-3的影响。方法用不同浓度的白藜芦醇诱导培养MDA-MB-231细胞24h后,采用流式细胞术(FCM)和DNA琼脂糖凝胶电泳检测细胞凋亡,FCM测定细胞内活性氧(ROS)水平,免疫组织化学法检测Caspase-3蛋白的变化。结果白藜芦醇能诱导MDA-MB-231细胞凋亡,DNA电泳可见梯状条带出现,并呈现典型的凋亡改变,60μmol/L白藜芦醇作用MDA-MB-231细胞4、12和24h后细胞ROS生成量分别为:50.0±5.7、115.0±10.6、79.2±6.9;Caspase-3蛋白活性逐渐增加。结论白藜芦醇诱导MDA-MB-231细胞凋亡与细胞ROS水平升高和Caspase-3活化有关,可能是白藜芦醇诱导MDA-MB-231细胞凋亡机制之一。     

17种国产菝葜属植物中白藜芦醇含量比较

目的测定17种国产菝葜属植物样品中白藜芦醇的含量。方法以活性成分白藜芦醇为指标,采用HPLC法对采自我国17种菝葜属植物样品进行含量测定。结果不同品种菝葜中白藜芦醇的含量有显著差异。小果菝葜、长托菝葜、黑果菝葜等含量较高,而短梗菝葜、尖叶菝葜、土茯苓等不能检测出。结论该研究为菝葜属植物资源的深入开发利用提供了一定的科学依据。     

白黎芦醇体外抗肝纤维化实验研究

目的:探讨白黎芦醇体外抗肝纤维化的作用机制。方法:原位灌流分离大鼠肝细胞,以维生素E作阳性对照,检测不同浓度白黎芦醇对四氯化碳(CCl4)损伤后肝细胞中丙二醛(MDA)、丙氨酸氨基转移酶(ALT)活性和肝细胞存活率的影响;并用肝星状细胞(HSC)与次氮基三醋酸铁共同培养产生氧应激后,检测不同浓度白黎芦醇对HSC增殖和Ⅰ型胶原生成的影响,并测定细胞培养液中MDA、超氧化物歧化酶(SOD)活性。结果:白黎芦醇明显改善CCl4损伤后肝细胞存活率,抑制CCl4引起的ALT、MDA活性升高,并能明显抑制HSC氧应激后MDA活性升高和SOD活性的降低,抑制HSC增殖和Ⅰ型胶原的生成。结论:白黎芦醇抗肝纤维化作用可能与其抗脂质过氧化有关。