姜黄素对肝癌HepG2和Bel-7404细胞增殖的抑制作用

目的研究姜黄素对人肝癌HepG2和Bel-7404细胞增殖的影响。方法不同浓度的姜黄素(2.5,10.0,25.0,50.0,100.0μg/mL),0.2%二甲基亚砜的RPMI 1640培养基加细胞为空白对照,2μg/mL顺铂为阳性对照。MTT法检测肝癌HepG2和Bel-7404细胞的增殖。结果姜黄素对肝癌细胞HepG2和Bel-7404的增殖抑制有量效关系,并呈时间依赖性。在相同作用时间下,姜黄素组、顺铂组对肝癌细胞HepG2和Bel-7404增殖有明显的抑制作用,与空白对照组比较均有显著性差异(P<0.05)。与空白对照组比较,2.5,10.0μg/mL姜黄素对肝癌细胞HepG2和Bel-7404的增殖没有明显的抑制作用(P>0.05),而25.0,50.0,100.0μg/mL姜黄素以及顺铂组对肝癌细胞HepG2和Bel-7404的增殖均有明显的抑制作用(P<0.05)。结论姜黄素可以明显的抑制肝癌细胞HepG2和Bel-7404的生长,且存在剂量-时间的关系。     

北青龙衣中萘醌类衍生物的细胞毒活性研究

目的研究北青龙衣中萘醌类衍生物的细胞毒活性。方法利用MTT法测定从北青龙衣中分离得到的12个萘醌类衍生物对SMMC7721人肝癌细胞和MCF-7人乳腺癌细胞的细胞毒活性。结果 12个萘醌类衍生物中,4-羟基萘-1-O-β-D-吡喃葡萄糖苷（9）,1,4,8-三羟基萘-1-O-β-D-吡喃葡萄糖苷（10）和1,4,8-三羟基萘-1-O-β-D-[6＇-O-（3＇＇,4＇＇,5＇＇-三羟基苯甲酰）]吡喃葡萄糖苷（11）对SMMC7721人肝癌细胞显示不同程度的抑制作用,仅11对MCF-7人乳腺癌细胞显示较强的细胞毒作用。结论北青龙衣中萘醌类衍生物在其抗肿瘤活性中可能起重要作用。     

2-羟基-1-萘醛缩对氨基水杨酸希夫碱铬配合物的合成及体外抗肿瘤活性研究

目的合成2-羟基-1-萘醛缩对氨基水杨酸希夫碱铬配合物药物并研究其体外抗肿瘤作用。方法采用常规加热回流法合成化合物,利用紫外吸收、红外光谱、元素分析等方法对其进行表征。采用四甲基偶氮唑盐(MTT)法考察合成的药物对人肝癌细胞HepG-2、人结肠腺癌细胞LS174T、人胃腺癌细胞SGC-7901增殖的抑制作用。结果铬配合物的组成为[C_(36)H_(26)N_2O_8Cr]·2H_2O;对HepG-2、LS174T和SGC-7901细胞都有不同程度的抑制作用,并呈现良好的剂量-效应关系,对HepG-2、LS174T的活性明显大于SGC-7901;对HepG-2、LS174T和SGC-7901癌细胞的半数抑制浓度分别为0.008 0μmol/L、0.012 5μmol/L和0.022 5μmol/L。结论 2-羟基-1-萘醛缩对氨基水杨酸希夫碱铬配合物能抑制Hep G-2、LS174T和SGC-7901细胞的生长,在体外有良好的抗肿瘤活性。     

北青龙衣中萘醌类衍生物的细胞毒活性研究

目的 研究北青龙衣中萘醌类衍生物的细胞毒活性。方法 利用MTT法测定从北青龙衣中分离得到的12个萘醌类衍生物对SMMC7721人肝癌细胞和MCF-7人乳腺癌细胞的细胞毒活性。结果 12个萘醌类衍生物中,4-羟基萘-1-O-b-D-吡喃葡萄糖苷(9),1,4,8-三羟基萘-1-O-b-D-吡喃葡萄糖苷(10)和1,4,8-三羟基萘-1-O-b-D-[6’-O-(3’’,4’’,5’’-三羟基苯甲酰)]吡喃葡萄糖苷(11)对SMMC7721人肝癌细胞显示不同程度的抑制作用,仅11对MCF-7人乳腺癌细胞显示较强的细胞毒作用。结论 北青龙衣中萘醌类衍生物在其抗肿瘤活性中可能起重要作用。     

青蒿素对肝癌HepG2细胞增殖、凋亡及β-catenin蛋白表达的影响

目的探索青蒿素对肝癌细胞的抑制作用及其作用机制。方法不同浓度的青蒿素与人肝癌细胞HepG2培养24、48、72 h,采用cell viability法检测细胞增殖活性,细胞克隆实验检测抑制情况,细胞流式实验检测凋亡,Western blot和免疫荧光实验检测HepG2细胞内β-catenin蛋白含量的变化。结果青蒿素以时间和剂量依赖的方式抑制HepG2细胞的增殖。与空白对照相比较,青蒿素对人肝癌HepG2细胞的增殖有明显抑制作用(P<0.05),且青蒿素能诱导肝癌HepG2细胞凋亡。青蒿素通过增加HepG2细胞质内的β-蛋白含量,进而抑制上皮细胞向间充质细胞的转变。结论青蒿素能够抑制肝癌细胞HepG2的增殖,并具有抑制肝癌细胞转移的潜力,其可能是通过抑制β-catenin从细胞质向细胞核的转运,进而抑制细胞上皮间充质转换。     

姜黄素对人皮肤鳞状细胞癌细胞SCL-1凋亡的影响及相关机制研究

目的：探讨不同浓度姜黄素对人皮肤鳞状细胞癌细胞系SCL-1增殖及凋亡的影响,并探讨其可能的作用机制.方法：以体外培养的人皮肤鳞癌细胞系SCL-1为研究对象,用不同浓度的姜黄素处理后,CCK-8法观察姜黄素对SCL-1细胞的生长抑制作用,AnnxinV-FITC/PI法检测细胞早期凋亡,实时荧光定量RT-PCR法检测Caspase-3、Caspase-9 mRNA的表达,酶标比色法检测Caspase-3 及-9的活性.结果：浓度大于10 μmol·L-1姜黄素能显著抑制SCL-1细胞的增殖,诱导其凋亡,并上调细胞内Caspase-3及-9 mRNA的表达及活性.结论：姜黄素能抑制SCL-1细胞的增殖、诱导其凋亡,上调Caspase-3及-9的表达及活性是其可能的分子机制之一.     

喜树碱及其衍生物对肝癌细胞HepG2增殖抑制与凋亡的研究

目的探讨喜树碱(CPT)及其衍生物10-羟基喜树碱(HCPT)、7-乙基喜树碱(SN22)、7-乙基-10-羟基喜树碱(SN38)在体外对肝癌细胞Hep G2增殖抑制与凋亡的影响。方法取对数期生长的HepG2细胞,分为对照组以及实验组,将4种药物配成浓度梯度0.01、0.1、1、10、100μmol/L的药物溶液。将不同浓度的药物溶液作用于肝癌细胞48 h,MTT法测定Hep G2细胞的增殖情况,Anexin V-PI染色,流式细胞仪检测细胞凋亡情况。结果 MTT法显示,4种药物对肝癌细胞Hep G2的增殖具有抑制作用,在一定范围内随着药物浓度的增加,对Hep G2细胞增殖的抑制作用逐渐增强,呈量效依赖关系,其中7-乙基-10-羟基喜树碱抑制效果最好,10-羟基喜树碱、7-乙基喜树碱次之,喜树碱抑制效果最差。不同浓度的喜树碱及衍生物处理肝癌细胞HepG2,与对照组比较差异有统计学意义,随着药物浓度的变化,细胞凋亡也呈现梯度变化,结构修饰后的SN38比SN22、HCPT及CPT作用更强。结论喜树碱及衍生物对肝癌细胞HepG2有抑制作用,并且能够诱导细胞凋亡。     

姜黄素Ⅲ与丝裂霉素联用抑制肝癌细胞BEL-7402的实验研究

目的研究姜黄素Ⅲ联合丝裂霉素抑制体外人肝癌细胞BEL-7402生长增殖的效果。方法体外培养人肝癌细胞BEL-7402,以四甲基偶氮唑蓝（MTT）法测2种药物对癌细胞的抑制率及联合用药时的抑制率。结果姜黄素Ⅲ、丝裂霉素均能抑制体外肝癌细胞增殖并呈时间与剂量依赖性。姜黄素10、20、40、80μmol／L与丝裂霉素1、2μmol／L联合用药24、48、72h的抑制率显著高于单独用丝裂霉素、姜黄素Ⅲ（P〈0．05）,两者呈现出相加的抗癌效果。结论姜黄素Ⅲ能有效抑制体外人肝癌BEL-7402细胞增殖．联合丝裂垂素用药时能提高丝裂霉素对人肝癌BEL-7402细胞的敏感性。     

β-榄香烯取代哌嗪酰胺类衍生物的合成及抗肿瘤活性研究

目的设计合成β-榄香烯取代哌嗪酰胺类衍生物并进行体外抗癌活性筛选。方法通过合成β-榄香烯单氯代物,在其结构中引入取代哌嗪结构来合成β-榄香烯取代哌嗪衍生物,然后再与取代苯甲酰氯或取代苯丙烯酰氯反应制得β-榄香烯取代哌嗪酰胺类衍生物。采用MTT法测定了目标化合物对人宫颈癌细胞、人肝癌细胞、人纤维肉瘤细胞等10种细胞的增殖抑制作用。结果与结论合成了23个未见文献报道的β-榄香烯取代哌嗪酰胺类衍生物。经1H—NMR、MS波谱分析确证结构。其中21个化合物经MTT法测定了体外抗肿瘤活性,结果显示活性大多高于β-槛香烯。     

姜黄素对肿瘤细胞增殖的影响

目的观察姜黄素在体外对多种常见肿瘤细胞增殖的影响。方法分别用0、1、2、5、10、20、50、100μmol·L^-1姜黄素处理人乳腺癌细胞（MCF-7）、人子宫颈癌细胞（Hela）、人肺癌细胞（A549）、人肝癌细胞（HepG-2）24、48、72 h,采用MTT法检测细胞增殖抑制率,并计算72 h时的半数抑制浓度（50%concentration of inhibition,IC50）。结果姜黄素在体外对上述4种细胞增殖均有抑制作用,且呈浓度、时间依赖性。结论姜黄素具有抑制多种肿瘤细胞增殖的作用。     

2'-chloro-4'-aminoflavone derivatives selectively targeting hepatocarcinoma cells: convenient synthetic process, G(2)/M cell cycle arrest and apoptosis triggers

A series of 2'-chloro-4'-nitroflavone and 2'-chloro-4'-aminoflavone derivatives were synthesized by a convenient synthetic process. The in vitro anti-proliferation ability of these compounds was evaluated against hepatocarcinoma cells (HepG2), breast adenocarcinoma cells (MCF-7), and human chronic myelogenous leukemia cells (K562). Most of synthetic compounds possessed notable anti-proliferation activity against HepG2 cells and little activity against MCF-7 cells and K562 cells. In particular, compounds 4c and 4e exhibited high anti-proliferation activity against HepG2 cells with IC(50) at about 2.0 μM. Further toxicity screening toward normal human hepatocytes indicated that some compounds had low toxicity against normal liver cells, among which 4e displayed very weak effects on QSG7701 and HL7702 cells, with IC(50) values >100 and 50 μM, respectively. Compound 4c, with the best anti-proliferation activity in amino-substituted flavones (IC(50) = 2.0 μM), was selected for further evaluation of its effects on apoptosis and the cell cycle. HepG2 cells were exposed to this compound at 10 μM, which induced nuclear disassembly and DNA fragmentation. Flow cytometry analysis suggested that the population of apoptotic cells greatly increased in the 4c-treated HepG2 cells, and the cell cycle was arrested at the G(2)/M phase.     

Curcumin up-regulates LDL receptor expression via the sterol regulatory element pathway in HepG2 cells

Plasma low-density lipoprotein-cholesterol (LDL-C) is mainly taken up and cleared by the hepatocellular LDL receptor (LDL-R). LDL-R gene expression is regulated by the sterol regulatory element binding proteins (SREBPs). Previous studies have shown that curcumin reduces plasma LDL-C and has hypolipidemic and anti-atherosclerotic effects. Herein, we investigated the effect of curcumin on LDL-R expression and its molecular mechanism in HepG2 cells. Curcumin increased LDL-R expression (mRNA and protein) and the resultant uptake of DiI-LDL in a dose- and time-dependent manner. Using a GFP reporter system in a transfected HepG2/SRE-GFP cell line, we found that curcumin activated the sterol regulatory element of the LDL-R promoter. In HepG2/Insig2 cells, curcumin reversed the inhibition of LDL-R expression induced by Insig2 overexpression. These data demonstrate that curcumin increases LDL-R protein expression and uptake activity via the SREBPs pathway. These findings contribute to our further understanding of the cholesterol-lowering and anti-atherosclerotic effects of curcumin.     

丹酚酸A诱导HepG2细胞凋亡及抑制c-Met表达

目的通过研究丹酚酸A（salvianol acid A,SalA）对肝癌HepG2细胞株c-Met蛋白表达的影响,探讨SalA抑制肝癌细胞增殖,诱导细胞凋亡的可能作用机制。方法以肝癌HepG2细胞株为研究对象,采用MTT法及流式细胞术检测SalA作用后细胞存活、增殖及凋亡情况;同时运用Westernblot法及PCR法检测HepG2细胞c-Met及其下游信号通路中关键蛋白和基因表达的改变。结果肝癌HepG2细胞经SalA处理后,其细胞增殖显著抑制,细胞凋亡比例亦升高,且呈浓度依赖性;同时HepG2细胞中c-Met及其下游信号分子AKT的磷酸化水平显著下调,凋亡相关蛋白Bax、caspase-3和caspase-9的表达亦明显上调。结论SalA能有效抑制肝癌HepG2细胞的增殖并诱导细胞凋亡,其作用机制可能与其抑制HepG2细胞中c-Met蛋白及其下游信号通路中AKT蛋白的磷酸化水平有关。     

Curcumin activates human glutathione S-transferase P1 expression through antioxidant response element

Curcumin is a plant-derived diferuloylmethane compound extracted from Curcuma longa, possessing antioxidative and anticarcinogenic properties. Antioxidants and oxidative stress are known to induce the expression of certain classes of detoxification enzymes. Since the upregulation of detoxifying enzymes affects the drug metabolism and cell defense system, it is important to understand the gene regulation by such agents. In this study, we demonstrated that curcumin could induce the expression of human glutathione S-transferase P1 (GSTP1). In HepG2 cells treated with 20 μM curcumin, the level of GSTP1 mRNA was significantly increased. In luciferase reporter assays, curcumin augmented the promoter activity of a reporter construct carrying 336 bp upstream of the 5′-flanking region of the GSTP1 gene. Mutation analyses revealed that the region including antioxidant response element (ARE), which overlaps AP1 in sequence, was essential to the response to curcumin. While the introduction of a wild-type Nrf2 expression construct augmented the promoter activity of the GSTP1 gene, co-expression of a dominant-negative Nrf2 abolished the responsiveness to curcumin. In addition, curcumin activated the expression of the luciferase gene from a reporter construct carrying multiple ARE consensus sequences but not one with multiple AP1 sites. In a gel mobility shift assay with an oligonucleotide with GSTP1 ARE, an increase in the amount of the binding complex was observed in the nuclear extracts of curcumin-treated HepG2 cells. These results suggested that ARE is the primary sequence for the curcumin-induced transactivation of the GSTP1 gene. The induction of GSTP1 may be one of the mechanisms underlying the multiple actions of curcumin.     

Structural essentials of xenoestrogen dialkyl phthalates to bind to the estrogen receptors

Xenoestrogen dialkyl phthalates, C(6)H(4)(COOC(n)H(m))(2), lack the phenolic hydroxyl group that is an essential structural component of the steroid A ring of 17 beta-estradiol. In order to examine whether dialkyl phthalates imitate the steroid structure, we have synthesized a series of 4-hydroxyl derivatives of dialkyl phthalates. The compounds were examined for their ability to displace [(3)H]17 beta-estradiol from the recombinant human estrogen receptor, which was expressed on Sf9 cells using the vaculovirus expression system. Dialkyl 4-hydroxyl phthalates were found to exhibit several-fold higher binding affinities compared to phthalates without the 4-hydroxyl group. From the analyses of receptor binding modes of dialkyl phthalates with and without the 4-hydroxyl group, it was deduced that the phthalic benzene ring mimics the steroid A ring. A biphasic binding curve observed for dicyclohexyl phthalate was also depicted by its 4-hydroxyl derivative, but it increased binding affinity only at the high affinity binding site. These data suggest that the phthalate benzene moiety recognizes the core of the estrogen receptor binding site and the hydrophobic interaction of the dialkyl moiety substantiates the binding characteristics of the phthalates. The present data indicate that even chemicals with slight structural analogy and weak receptor affinity can perturb the endocrine system when administered in high concentrations.     

LY294002联合姜黄素对人膀胱癌EJ细胞的体外抑制作用

目的 研究磷脂酰肌醇-3激酶/蛋白激酶B(PI3K/Akt)特异性抑制剂LY294002与姜黄素联合对体外培养的人膀胱癌EJ细胞的抑制作用.方法 用MTT法,检测姜黄素单独或联合PI3K/Akt特异性抑制剂LY294002对人膀胱癌EJ细胞的抑制率;用流式细胞技术及Western blotting法,检测药物单独或联合...     

4-(4-羟基-3-甲氧基苯甲基)姜黄素合成及其抗肿瘤活性

目的:合成4-(4-羟基-3-甲氧基苯甲基)姜黄素(C086),并对其体内外抗肿瘤活性进行评价。方法:以芳香醛、乙酰丙酮为原料,Knovenagel缩合、氢化还原、Claisen-Schmidt缩合三步反应制备目标化合物。以姜黄素为对照,MTT法考察目标化合物对人慢性粒细胞白血病急变细胞株K562、人急性髓系白血病细胞株HL-60、人肝肿瘤细胞株HepG2、小鼠黑色素瘤细胞株B-16、人结肠癌细胞株SW480、人神经母细胞瘤细胞株SH-SY5Y、人胰腺癌细胞株Bxpc-3、人胃癌细胞株MGC80-3的抑制活性。考察目标化合物体内抑制人结肠癌SW480裸鼠移植性肿瘤活性。结果:目标化合物结构经核磁和质谱确证,对上述细胞株的IC50值依次为2.90,4.11,4.11,3.55,4.78,7.92,18.8,17.1μmol.L-1,均明显比姜黄素强,100mg.kg-1.d-1灌胃给药对人结肠癌SW480裸鼠移植性肿瘤的抑瘤率为40.7%,小鼠的体质量无明显减轻。结论:合成了4-(4-羟基-3-甲氧基苯甲基)姜黄素,体外对多种肿瘤细胞抑制活性明显强于Cur,体内能明显抑制结肠癌移植瘤的生长。     

海泥青霉Penicillium sp.WF-06的抗肿瘤活性代谢产物

目的 阐明海泥青霉Penicillium sp.WF-06的抗肿瘤活性次级代谢产物.方法 28℃下,130r/min摇床发酵7d培养生产菌WF-06,活性跟踪分离纯化WF-06发酵液中的活性单体化合物,根据理化性质和光谱分析(ESI MS、UV、IR、NMR等)鉴定单体化合物结构;采用细胞形态镜检、MTT方法评价单体化...     

姜黄素衍生物生物活性的研究进展

目的阐述姜黄素及其衍生物的最新研究进展。方法根据关于姜黄素及其衍生物的研究开发现状的多篇相关文献,对姜黄素的苯环和中间连接链的结构改造特点进行整理和归纳。结果与结论大多数姜黄素衍生物的生物活性都有所提高。另外还总结了一部分化合物的构效关系。