槲皮素及其水溶性衍生物对HL-60细胞生长影响的比较

目的　研究并比较槲皮素及其硫酸酯钠盐衍生物 (槲皮素单硫酸酯钠、槲皮素二硫酸酯钠 )对HL 6 0细胞生长的影响。方法　细胞存活力以台盼兰染色法测定 ;蛋白激酶CK 2活性以连接到CK 2底物上的 [γ 3 2 P]GTP的3 2 P放射活度来检测 ;细胞周期变化以流式细胞仪检测。结果　槲皮素、槲皮素单硫酸酯钠和槲皮素二硫酸酯钠均可抑制HL 6 0细胞的生长 ,槲皮素和槲皮素单硫酸酯钠对HL 6 0细胞生长的抑制作用差异无显著性 (P >0 0 5 ) ,槲皮素二硫酸酯钠的作用则比槲皮素弱得多 (P <0 0 1) ;槲皮素可抑制HL 6 0细胞中蛋白激酶CK 2的活性 ,而槲皮素单硫酸酯钠和槲皮1999 0 5 14收稿 ,1993 0 7 15修回 广东省自然科学基金资助课题 (No 940 5 86)和广东省高教厅重点学科资助课题 (No 93 0 4)作者简介 :翁　云 ,女 ,2 7岁 ,硕士 ;梁念慈 ,男 ,5 8岁 ,教授 ,博士生导师 ,广东医学院院长。研究方向 :生化药理学素二硫酸酯钠对HL 6 0细胞内CK 2活性无明显影响 ;槲皮素阻断HL 6 0细胞于G2 /M期 ,而槲皮素单硫酸酯钠和槲皮素二硫酸酯钠均阻断细胞于G0 /G1期。结论　槲皮素、槲皮素单硫酸酯钠和槲皮素二硫酸酯钠均为潜在的肿瘤细胞生长抑制剂 ,但它们的抑制机制却不相同 ,槲皮素 7 OH对维持槲皮素的功能有重要作用。     

Toxic effects induced by curcumin in human astrocytoma cell lines

Abstract

Objective: The objective of this study was to describe the toxicity induced by curcumin in human astrocytoma cell lines.

Methods: The effects induced by curcumin, at 100?µM for 24?h, were evaluated in four astrocytoma cell lines using crystal violet assay and through the evaluation of morphological and ultrastructural changes by electron microscopy. Also, the results of vital staining with acridine orange and propidium iodide for acidic vesicles and apoptotic bodies were analyzed and the expression of the Beclin1 gene was assessed by RT-PCR.

Results: The cells treated with curcumin at 100?µM induced an inhibitory concentration₅₀ of viability with morphological changes characterized by a progressive increase in large, non-acidic vesicles devoid of cytoplasmic components and organelles, but that conserved the cell nuclei. No DNA breakage was observed. The astrocytoma cells showed no apoptosis, necrosis or autophagy. Expression of BECLIN1 was not induced (p?<?0.05) by curcumin in the astrocytoma cells.

Conclusions: Curcumin at 100?µm induced a new type of death cell in astrocytoma cell lines.     

脑星形细胞瘤中HPA的表达及其对肿瘤细胞侵袭力的影响

目的：观察乙酰肝素酶（ HPA）在人脑星形细胞瘤组织的表达及对肿瘤细胞侵袭力的影响。方法采用免疫组化ElivisionTMplus两步法和Real time-PCR法检测75例星形细胞瘤组织和40例正常脑组织中HPA蛋白和mRNA表达情况。通过siRNA干扰技术沉默星形细胞瘤U87细胞中HPA表达,采用Real time PCR、Western blot、Tr-answell小室实验检测肿瘤细胞HPA、血管内皮生长因子（ VEGF ）、基质金属蛋白酶-9（ MMP-9）表达及细胞侵袭力变化。结果正常脑组织未见HPA蛋白表达,星形细胞瘤组织中HPA阳性表达率为78侣．67％（59／75）,星形细胞瘤组织HPA阳性表达率显著高于正常脑组织,且其mRNA表达水平也显著高于正常脑组织,差异有统计学意义（ P ＜0．05）。星形细胞瘤Ⅱ～Ⅳ级组,HPA阳性表达率逐渐增加,差异有统计学意义（ P ＜0．05）;且有转移组HPA阳性表达率显著高于无转移组（ P ＜0．05）。 siRNA能够有效抑制星形细胞瘤U87细胞中HPA表达,并下调VEGF、MMP-9表达,同时穿膜细胞数显著减少,差异有统计学意义（ P ＜0．05）。结论 HPA在星形细胞瘤组织异常高表达,随着肿瘤恶性程度增高而逐渐升高。 siRNA沉默HPA后细胞侵袭力显著降低,HPA有可能成为治疗星形细胞瘤的潜在靶点。     

槲皮素对人胃癌MKN45细胞的抑制作用研究

目的探讨槲皮素对人胃癌MKN45细胞凋亡的影响及其作用机制。方法取对数生长期的MKN45细胞分为对照组和20、40、80μmol/L槲皮素组。应用MTT比色法测定细胞活性,Hoechst染色、流式细胞技术检测细胞凋亡,比色法检测凋亡相关因子Caspase-3、Caspase-9表达。结果槲皮素能显著抑制MKN45细胞增殖,促进细胞凋亡,升高Caspase-3、Caspase-9基因表达水平。结论槲皮素可通过增强Caspase-3、Caspase-9基因表达诱导人胃癌MKN45细胞凋亡。     

槲皮素对HL-60细胞周期的影响

本文报道了槲皮素对人早幼粒白血病细胞株HL-60细胞的增殖和细胞周期的影响. 结果表明槲皮素能抑制HL-60细胞的增殖， 呈剂量依赖关系， 当槲皮素作用24， 48， 72 h后， 其IC₅₀分别为 46.6, 28.7, 14.9 μmol·L^-1流式细胞仪分析表明，槲皮素能明显增加HL-60的G₂-M期细胞，而相对减少G₀/G₁细胞之百分比，且呈剂量依赖关系，当去除槲皮素时，该作用是可逆的. 结果表明槲皮素对肿瘤细胞的生长抑制作用可能与其对细胞周期的影响有关.     

Effect of quercetin on cell cycle of HL-60 cells

本文报道了槲皮素对人早幼粒白血病细胞株ＨＬ－６０细胞的增殖和细胞周期的影响．结果表明槲皮素能抑制ＨＬ－６０细胞的增殖，呈剂量依赖关系，当槲皮素作用２４，４８，７２ｈ后，其ＩＣ５０分别为４６．６，２８．７，１４．９μｍｏｌ·Ｌ－１．流式细胞仪分析表明，槲皮素能明显增加ＨＬ－６０的Ｇ２－Ｍ期细胞，而相对减少Ｇ０／Ｇ１细胞之百分比，且呈剂量依赖关系，当去除槲皮素时，该作用是可逆的．结果表明槲皮素对肿瘤细胞的生长抑制作用可能与其对细胞周期的影响有关．     

槲皮素对过氧化氢诱导的血管内皮细胞周期及NO水平的影响

目的研究槲皮素对人脐静脉血管内皮细胞增殖周期及细胞内一氧化氮产生的影响。方法用过氧化氢诱导血管内皮细胞损伤,采用ＭＴＴ比色法、流式细胞仪观察槲皮素对血管内皮细胞作用及周期的影响;用硝酸还原酶法测定细胞培养液中ＮＯ水平。结果过氧化氢对血管内皮细胞具有损伤作用,槲皮素剂量依赖性促进过氧化氢诱导血管内皮细胞的增殖,而且主要是Ｓ期和Ｇ２Ｍ期细胞比率增加;槲皮素可减少过氧化氢诱导的血管内皮细胞释放乳酸脱氢酶及促进过氧化氢诱导血管内皮细胞内ＮＯ水平的增加。结论槲皮素可保护过氧化氢诱导血管内皮细胞的损伤及修复,其作用可能与ＮＯ的水平有关。     

Silencing of Hsp27 and Hsp72 in glioma cells as a tool for programmed cell death induction upon temozolomide and quercetin treatment

The aim of the present study was to investigate whether silencing of Hsp27 or Hsp72 expression in glioblastoma multiforme T98G and anaplastic astrocytoma MOGGCCM cells increases their sensitivity to programmed cell death induction upon temozolomide and/or quercetin treatment. Transfection with specific siRNA was performed for the Hsp gene silencing. As revealed by microscopic observation and flow cytometry, the inhibition of Hsp expression was correlated with severe apoptosis induction upon the drug treatment studied. No signs of autophagy were detected. This was correlated with a decreased mitochondrial membrane potential, increased level of cytochrome c in the cytoplasm, and activation of caspase 3 and caspase 9. All these results suggest that the apoptotic signal was mediated by an internal pathway. Additionally, in a large percentage of cells treated with temozolomide, with or without quercetin, granules within the ER system were found, which was accompanied by an increased level of caspase 12 expression. This might be correlated with ER stress. Quercetin and temozolomide also changed the shape of nuclei from circular to “croissant like” in both transfected cell lines. Our results indicate that blocking of Hsp27 and Hsp72 expression makes T98G cells and MOGGCCM cells extremely vulnerable to apoptosis induction upon temozolomide and quercetin treatment and that programmed cell death is initiated by an internal signal.     

槲皮素联合喜树碱促进人前列腺癌PC-3细胞的凋亡

目的考察槲皮素联用喜树碱对人前列腺癌PC-3细胞凋亡的影响。方法体外培养PC-3细胞,用CCK-8实验、细胞周期检测实验和Annexin V-FITC/PI双染细胞凋亡检测实验,考察槲皮素联用喜树碱对PC-3细胞增殖凋亡的影响;用Western-Blot实验检测凋亡相关蛋白(Bcl-2、Bax、PARP1和Caspase-3)的表达。结果 CCK-8实验结果显示槲皮素和喜树碱都可以一定程度地抑制PC-3细胞增殖,诱导凋亡作用,其中槲皮素和喜树碱联用效果更优。药物作用48 h后其半数抑制浓度(IC₅₀)分别为38.76、2.25、1.88μmol·L^-1。细胞周期实验显示,药物联用组细胞周期处于S期的细胞比例明显高于单用组(P<0.05);细胞凋亡实验显示,药物联用组的细胞凋亡率显著高于单用组(P<0.05);Western-Blot结果显示,药物联用组对凋亡相关蛋白的影响更为明显,使Bcl-2蛋白表达下降为47%,分别使Bax、PARP1和Caspase-3依次增加1.17、0.77和0.69倍(P<0.05)。结论槲皮素联合喜树碱能够显著促进人前列腺癌PC-3细胞的凋亡。     

槲皮素的植物雌激素作用及其受体机制研究

目的:探讨槲皮素(quercetin,Que)的植物雌激素作用及其可能的受体作用机制.方法:采用噻唑蓝(MTT)比色法测定槲皮素对雌激素依赖性乳腺癌细胞T47D和非雌激素依赖性乳腺癌细胞MDA-MB231的细胞增殖作用,流式细胞术对T47D细胞的增殖情况进行分析.Western blot方法测定槲皮素对T47D细胞雌激素受体两种亚型ERα和ERβ表达的影响,并以雌激素受体拮抗剂ICI182,780为工具药来评价槲皮素发挥雌激素样作用与雌激素受体的关系.结果:与溶剂对照组相比较,槲皮素(10,20,40 μmol·L^-1) 能显著促进T47D细胞的增殖,而抑制雌激素受体阴性MDA-MB231细胞,并将T47D细胞周期由G₁期向S期推进,促进DNA合成,提高细胞分裂增殖指数;且槲皮素促进T47D细胞增殖作用被雌激素受体拮抗剂所拮抗,槲皮素在10 μmol·L^-1可明显诱导T47D细胞ERα蛋白表达,而对ERβ表达没有影响.当与ICI 182,780共孵育T47D细胞ERα表达被拮抗.结论:槲皮素具有雌激素活性,此作用是通过影响雌激素受体ERα蛋白表达介导的.     

槲皮素对HeLa细胞P21、CDK4蛋白表达的影响

目的:探讨不同浓度的槲皮素对HeLa细胞P21、CDK4蛋白表达的影响及意义。方法:采用不同浓度槲皮素处理体外培养的HeLa细胞,培养48h后免疫组织化学法检测HeLa细胞P21、CDK4蛋白表达的变化。结果:不同浓度的槲皮素均能显著增高P21和降低CDK4蛋白在HeLa细胞中的表达,且与空白对照组相比均有显著性差异(P<0.01)。结论:槲皮素可能通过上调HeLa细胞P21蛋白表达和下调CDK4蛋白表达,促进HeLa细胞凋亡。     

槲皮素对非细菌性前列腺炎治疗作用的实验研究

目的：观察槲皮素对实验性非细菌性前列腺炎的治疗效果。方法：采用五种模型、包括消痔灵诱导的大鼠慢性前列腺炎模型、角叉菜胶诱导的急性前列腺炎模型、巴豆油致耳肿胀模型、光刺激致痛模型、棉球肉芽肿模型及体外测定离体家兔尿道平滑肌张力试验,观察槲皮素的作用。结果：槲皮素对大鼠急慢性非细菌性前列腺炎具有良好的抗炎作用,对耳肿胀试验、肉芽肿试验及光刺激致痛试验具有良好的抑制作用,并对离体的尿道平滑肌具有较好的舒张作用。结论：槲皮素对实验性非细菌性前列腺炎具有良好的抑制作用,并对尿道平滑肌具有一定舒张作用,提示槲皮素具有良好的临床治疗非细菌性前列腺炎作用,并能缓解排尿困难症状。     

槲皮素抑制血管生成作用的实验研究

目的　研究槲皮素 (Quercetin)对血管生成和培养的人脐静脉内皮细胞 (HUVEC)的影响。方法　采用生长因子 (血管内皮细胞生长因子VEGF、碱性成纤维细胞生长因子bFGF)诱导的鸡胚绒毛尿囊膜 (CAM)血管增生模型观察槲皮素对血管生成的影响 ;利用培养的HUVEC ,用MTT法观察槲皮素抑制内皮细胞增殖的作用 ;流式细胞仪观察槲皮素对HUVEC细胞周期的影响。结果　槲皮素 (0 1、0 0 5和 0 0 2 5mmol·L-1)能明显抑制VEGF诱导的CAM小血管生成 ;槲皮素 (0 1和 0 0 5mmol·L-1)能明显抑制bFGF诱导的CAM小血管生成 ;槲皮素 (2 4 0、12 0 μmol·L-1和 6 0 μmol·L-1)对内皮细胞增殖有抑制作用 ,抑制率分别为 6 7 0 %、5 8 1%和39 7% ;槲皮素 (2 4 0、12 0 μmol·L-1)能显著导致HUVEC的S、G2 期阻滞。结论　槲皮素能抑制VEGF和bFGF诱导的血管生成 ,且对内皮细胞增殖具有抑制作用。     

Inhibitory effect of quercetin on proliferation of human microvascular endothelial cells in vitro

AIM: To investigate the role of quercetin (Que) in the proliferation of cultured human skin microvascular endothelial cells (MVEC). METHODS: Cell count and [methyl-~3H]thymidine ([~3H]TdR) uptake assay were used to measure the effect of Que in the proliferation of cultured MVEC. Cytotoxicity of Que on MVEC was also evaluated by ~(51)Cr release assay. RESULTS: When MVEC were treated with Que, the proliferation was significantly inhibited in a time-course and dose-dependent manner. Que 5 μmol/L did not inhibit the proliferation of MVEC. When the concentration of Que increased to 20, 40, 80, and 160μmol/L, the cell numbers per well were decreased and the inhibition rate was 12.2％, 23.5％, 35.3％, and 54.1％ respectively with IC_(50) of 138 μmol/L. The inhibitory rate of [~3H]-TdR uptake was 18.7％, 34.4％, 48.9％, and 62.5％ respectively (IC_(50)=87.5 μmol/L). ~(51)Cr release assay showed that Que 160μmol/L incubated with MVEC from 1 to 16h had no clear cytotoxicity compared with control group. CONCL     

Antihypertensive effects of the flavonoid quercetin

The blood pressure lowering effect of a fruit and vegetable-rich diet is a necessary dietary lifestyle measure now included the guidelines for the management of arterial hypertension. Furthermore, flavonoids represent a major class of plant polyphenolics. The present review addresses the antihypertensive effect of quercetin, one of the most abundant flavonoids present in fruits and vegetables, and probably the best studied flavonoid because of its high biological activity. Quercetin has been shown to induce a progressive, dose-dependent and sustained reduction in blood pressure when given chronically in several rat models of hypertension, including spontaneously hypertensive rats, L-NAME-treated rats, DOCA-salt hypertensive rats, two-kidney one-clip Goldblatt rats, rats with aortic constriction and Dahl salt-sensitive hypertensive rats. Quercetin was also effective in reducing blood pressure in rat models of metabolic syndrome, including the obese Zucker rats as well as rats treated with a high-sucrose, high-fat diet. Quercetin also prevented morphological and functional changes in the heart, vessels and kidney, while increasing production of reactive oxygen species associated with hypertension. A high dose of quercetin also reduced blood pressure in stage 1 hypertensive patients in a randomized, double-blind, placebo-controlled, crossover study. Since raised blood pressure is the major cause of stroke as well as an important risk factor for ischemic heart disease, we propose that the blood pressure-lowering effect of quercetin could be an important mechanism contributing to the reduced risk of myocardial infarction and stroke observed with fruit and vegetables-rich diets, and possibly with flavonoid-rich diets.     

Cationic nanoparticles induce caspase 3-, 7- and 9-mediated cytotoxicity in a human astrocytoma cell line

Abstract

On a daily basis we are exposed to cationic nanoparticulates in many different ways. They are known to distribute to many organs of the body, and while some evidence suggests that these nanoparticles are toxic to cells, the mechanism of their toxicity is not clear. Here we apply a combination of biochemical and imaging techniques to study the mechanism by which amine-modified polystyrene nanoparticles induce cell death in a human brain astrocytoma cell line. Flow cytometry analysis of cells exposed to cationic nanoparticles revealed an increase in cell membrane permeability of the dyes YoPro-1 and propidium iodide, indicating onset of an apoptotic followed by a secondary necrotic response. Activation of caspases 3/7 and 9 and cleavage of poly(ADP-ribose) polymerase (PARP)-1 was also detected, providing clear molecular evidence of the apoptotic pathway induced by the nanoparticles. Transmission electron microscopy also revealed that these nanoparticles induce morphological changes in lysosomes and mitochondria, consistent with our observation of a rapid increase in the formation of reactive oxygen species in these cells. Together these results suggest that amine-modified polystyrene nanoparticles can mediate cell death through an apoptotic mechanism mediated by damage to the mitochondria.     

Cytoprotective effects of quercetin and its sugar-containing natural congeners in cultured HEK293 cells injured by anoxia/hypoglycemia and the structure-effect relationship thereto

Objective To comparatively study anti-free radical and cytoprotective effects of quercetin(Q)and its monoglucoside isoquercetin(I),diglucoside rutin(R),which differs only in glycosyl-substitution at C-3 position of the molecules,using anoxia/hypoglycemia-induced cell injury model and thereby to explore the structure-effect relationship thereto.Methods The cell injury model was established by HEK293 cells cultured in vitro with Na2S2O3 plus sugar-free Earle's fluid as incubation medium;Cell survival rate(CSR),total antioxidant capacity(TAC),SOD and LDH levels were determined;The effect intensity of the 3 flavonoids were compared by means of IC50,the concentration required to achieve 50% inhibition of the changes in the above indices in injured cells.Results Q,I and R all concentration-dependently elevated CSR,TAC and SOD,and reduced LDH level;the all of IC50s for the above indices were ranked in order of IC50,QI>R.Conclusions The 3 structurally similar flavoloids all have significant and concentration-dependent anti-free radical and cyto-protective effects with the intensity being in order of aglycone>monoglucoside>diglucoside;the substitution of-OH by sugar group at C-3 position of flavoloids and increase in the sugar-substituent number are associated with the effect intensity reduced;namely,the intensity of these effects of flavonoids is negatively related the substutution by sugar group at C-3 position.     

槲皮素单硫酸酯钠对 HL-60细胞生长的影响(英文)

通过观察槲皮素单硫酸酯钠 (SQMS)对 HL-60细胞毒作用 ,细胞周期变化 ,胞内 Ca2 +浓度([Ca2 +]i)变化及蛋白激酶 CK2活性的变化研究SQMS对 HL- 60细胞生长的影响 .发现 SQMS(2 0- 1 2 0μmol· L-1)可浓度依赖性抑制 HL- 60细胞的生长 ,阻断 HL- 60细胞于 G0 /G1期 ;SQMS(1 0 0μmol· L-1)可使 [Ca2 +]i 由 (1 0 5± 9) nmol·L-1上升到 (2 0 1± 1 3) nmol· L-1;低浓度 SQMS(0 .55-8.8μmol· L-1)可显著抑制从 HL- 60细胞中纯化的蛋白激酶 CK2的活性 .结果提示 ,SQMS可抑制HL- 60细胞生长 ,其机理可能与抑制 HL- 60细胞中蛋白激酶 CK2的活性 ,提高细胞 [Ca2 +]i 及促进细胞分化有关 .     

A synthetic curcumin derivative hydrazinobenzoylcurcumin induces autophagy in A549 lung cancer cells

Context: Curcumin exhibits growth-suppressive activity against a variety of cancer cells, but low bioavailability restricts its application in chemotherapeutic trials. Nowadays, a growing number of curcumin derivatives or analogs are known, hoping to replace curcumin and circumvent this problem. Hydrazinobenzoylcurcumin (HBC) has been synthesized and identified as a potent inhibitor of cell proliferation in previous reports.

Objective: This study presents a novel mechanism of cell autophagy induced by HBC in the human non-small lung epithelial carcinoma (A549) cells.

Materials and methods: Cells were cultured and treated with HBC at different concentrations (10–80?μM) and at different time periods (1–24?h). Microscopic analysis was used to detect the morphology changes and autophagolysosomes of A549 cells. An acridine orange staining assay was conducted to evaluate the autophagolysosomes and autophagic vacuoles was analyzed by monodansylcadaverine (MDC) and GFP-LC3 transfection analysis. Western blotting was used to assess the conversion of microtubule-associated protein light chain 3 (LC3).

Results: HBC could induce A549 cells autophagolysosomes formation in a dose and time-dependent manner and the inhibitory rate of HBC (80?μM) on the viability of A549 cells reached 76.68?±?5.81% after 24?h of treatment. Autophagic vacuoles increased in a concentration-dependent manner in HBC-treated cell. Furthermore, conversion of LC3-I to LC3-II, accumulation of GFP-tagged LC3 positive intracellular vacuoles and increased fusion of autophagosomes with lysosomes suggested the occurrence of autophagy.

Conclusion: Our data indicate that HBC induced A549 cell autophagy, which is a novel cell death mechanism induced by curcumin derivatives.     

槲皮素对肝肿瘤细胞生长周期的影响

目的 :研究槲皮素对肝肿瘤细胞细胞周期的影响并探讨其机制。方法 :用联合四唑盐比色法研究槲皮素对肿瘤细胞生长的抑制作用 ,流式细胞仪、电镜及免疫细胞化学等方法观察槲皮素对肝肿瘤细胞株QGY ,HepG2体外生长的影响。结果 :槲皮素对HepG2和QGY均有抑制作用 ,使 G0 /G1期细胞增加 ,G2 /M期和S期细胞减少 ,出现凋亡峰 ,电镜下可凋亡小体。 4 8,72h后对HepG2的作用更明显。免疫细胞化学显示使用槲皮素后 ,2种细胞中增殖细胞核抗原 (PCNA)的阳性表达均减弱 ,而P2 1WAF1的表达均增强 ,Bax仅在HepG2细胞中表达增强。结论 :槲皮素对 2种肝肿瘤细胞株都有一定的抑制作用 ,可能主要通过增强 2种细胞株的P2 1WAF1的表达及减弱PCNA的表达诱导G0 /G1期阻滞及细胞凋亡