白花丹素体外诱导前列腺癌PC-3细胞凋亡的研究

目的 探讨白花丹素对前列腺癌PC-3细胞增殖、凋亡的作用及其和RelA(p65)表达的关系.方法 应用不同浓度梯度的白花丹素(1、5、1O、15、20 μmol/L)共同培养PC-3细胞24、48 h,噻唑蓝(MTT)比色法检测PC-3细胞增殖活力,双染流式细胞仪检测凋亡细胞,透射电镜观察超微病理变化,计算药物半数抑制浓度(IC50).逆转录-聚合酶链反应(RT-PCR)法扩增检测RelA(p65).结果 24 h组在10～20 μmol/L,48 h组在5～20 μmol/L时均出现生长抑制,IC50分别为12.88、3.71 μmol/L.双染流式细胞仪检测显示PC-3随作用浓度的上升凋亡率增加并呈现浓度依赖关系.透射电镜观察作用后PC-3呈现典型凋亡表现.RT-PCR结果提示其细胞凋亡率同Rel A(p65)表达呈负相关.结论 白花丹素体外实验可能通过抑制Rel A(p65)表达诱导PC-3的凋亡.     

白花丹醌的提取分离鉴定

目的对多民族药材白花丹(Phum bago zeylanicaL.)中的白花丹醌进行提取分离和鉴定。方法用硅胶柱层析分离;用TLC,IR,MS,NMR等技术鉴定结构。结果从白花丹中分离得到桔黄色针状结晶,根据理化性质、薄层色谱及光谱数据分析,鉴定为白花丹醌(P lumbagin)。结论为建立白花丹药材的质量控制方法打下了物质基础,对白花丹临床用药安全及进一步开发具有极其重要的意义。     

Research on the Antitumor Effect of Plumbagin by Inhibiting IL-6/STAT3 Pathway in Large Cell Lung Cancer

Background and Objective Lung cancer, which has become the leading cause of tumor mortality in many countries, appears to be one of the most dangerous malignant tumors that is     

Plumbagin,a medicinal plant (Plumbago zeylanica)-derived 1,4-naphthoquinone,inhibits growth and metastasis of human prostate cancer PC-3M-luciferase cells in an orthotopic xenograft mouse model

We present here first time that Plumbagin (PL), a medicinal plant-derived 1,4-naphthoquinone, inhibits the growth and metastasis of human prostate cancer (PCa) cells in an orthotopic xenograft mouse model. In this study, human PCa PC-3M-luciferase cells (2 × 10⁶) were injected into the prostate of athymic nude mice. Three days post cell implantation, mice were treated with PL (2 mg/kg body wt. i.p. five days in a week) for 8 weeks. Growth and metastasis of PC-3M-luciferase cells was examined weekly by bioluminescence imaging of live mice. PL-treatment significantly (p = 0.0008) inhibited the growth of orthotopic xenograft tumors. Results demonstrated a significant inhibition of metastasis into liver (p = 0.037), but inhibition of metastasis into the lungs (p = 0.60) and lymph nodes (p = 0.27) was not observed to be significant. These results were further confirmed by histopathology of these organs. Results of histopathology demonstrated a significant inhibition of metastasis into lymph nodes (p = 0.034) and lungs (p = 0.028), and a trend to significance in liver (p = 0.075). None of the mice in the PL-treatment group showed PCa metastasis into the liver, but these mice had small metastasis foci into the lymph nodes and lungs. However, control mice had large metastatic foci into the lymph nodes, lungs, and liver. PL-caused inhibition of the growth and metastasis of PC-3M cells accompanies inhibition of the expression of: 1) PKCε, pStat3Tyr705, and pStat3Ser727, 2) Stat3 downstream target genes (survivin and Bcl_xL), 3) proliferative markers Ki-67 and PCNA, 4) metastatic marker MMP9, MMP2, and uPA, and 5) angiogenesis markers CD31 and VEGF. Taken together, these results suggest that PL inhibits tumor growth and metastasis of human PCa PC3-M-luciferase cells, which could be used as a therapeutic agent for the prevention and treatment of human PCa.     

Plumbagin triggers DNA damage response,telomere dysfunction and genome instability of human breast cancer cells

AimNatural plant products are increasingly being used in cancer therapeutic studies due to their reduced normal cell toxicity. In this study, the anti-cancer properties of plumbagin, a naphthoquinone derivative extracted from the roots of Plumbago, were evaluated in breast cancer cells.MethodsTo evaluate the effects of plumbagin on breast cancer cell types, we employed a variety of techniques comprising cell viability, cell cycle assay, comet assay, western blotting, immunocytochemistry, measurement of telomerase activity, telomere restriction fragment length, quantitative fluorescence in situ hybridisation, along with gene expression analysis of untreated cells.ResultsPlumbagin treatment induced cytotoxicity in human breast cancer cells along with cell cycle arrest, DNA damage and cell death leading to apoptosis. Plumbagin was also found to suppress the telomerase activity in cancer cells accompanied by telomere attrition. Telomere shortening was corroborated by reduced telomere fluorescence on chromosome ends and genome instability.ConclusionTogether, these findings may suggest the application of plumbagin as adjuvant modality in breast cancer therapeutics.     

Plumbagin对人类大细胞肺癌NL9980细胞系抑癌作用的研究

目的研究Plumbagin对人类大细胞肺癌NL9980细胞系的抗肿瘤作用并探索其机制。方法不同浓度Plumbagin处理NL9980细胞系,采用MTT法观察其对肿瘤细胞增殖的影响,确定药物IC50,采用流式细胞术检测对细胞系诱导凋亡的作用,采用Boyden小室侵袭实验检测对体外侵袭力的抑制作用;以IC50 Plumbagin处理NL9980细胞系,于处理后6、24及48h收获细胞,以实时定量PCR方法检测bcl-2、bax、VEGF和CYCD1等基因的mRNA表达变化。结果MTT法显示Plumbagin明显抑制NL9980细胞系的细胞增殖,IC50为7．5μmol／L;Plumbagin对NL9980细胞系具有体外诱导凋亡作用,且明显抑制其体外侵袭能力,Bodyen小室侵袭实验检测对照组和Plumbagin组平均穿膜细胞数分别为161．59±47．32和26．58±9．07。Plumbagin处理NL9980细胞系后不同时间点检测结果显示,bcl-2、VEGF和CYCD1基因表达均逐渐减低,bax基因表达逐渐增高,组间差异有统计学意义（均P〈0．05）。结论Plumbagin对大细胞肺癌NL9980细胞系具有明确的抗肿瘤作用。Plumbagin可能通过多种作用机制发挥其抑癌作用,显示了其成为抗大细胞肺癌药物的前景。     

Pongapin and Karanjin,furanoflavanoids of Pongamia pinnata,induce G2/M arrest and apoptosis in cervical cancer cells by differential reactive oxygen species modulation,DNA damage,and nuclear factor kappa‐light‐chain‐enhancer of activated B cell signaling

In this study, the antitumor activity of two furanoflavanoid derivatives, Pongapin and Karanjin, was evaluated in comparison with Plumbagin, a plant‐derived polyphenol with proven antitumor activity. The compounds differentially inhibit the growth of different cancer cell lines (most effective on HeLa cells), with very low inhibitory effect on the growth of normal mouse embryonic fibroblast cell line. Pongapin like Plumbagin could significantly increase the intracellular reactive oxygen species (ROS) in the HeLa cells by stabilization of nuclear factor of kappa light polypeptide gene enhancer in B‐cells inhibitor (I‐κB) expression and reduction of nuclear factor kappa‐light‐chain‐enhancer of activated B cells (NF‐κB) expression. In contrast, Karanjin could decrease ROS level by inhibition of I‐κB degradation resulting restriction of NF‐κB nuclear translocation. Pongapin and Plumbagin significantly increased DNA damage‐induced p53 expression and p21 nuclear expression. However, Karanjin treatment showed low DNA damage with increased p53 expression. The compounds induced G2/M arrest and increase in SubG1 population, indicating induction of apoptosis. Apoptosis was further validated by acridine orange/ethidium bromide dual staining and terminal deoxynucleotidyl transferase dUTP nick‐end labeling assay in HeLa cells after treatment with the compounds. The compounds induced caspase‐dependent apoptosis through induction of Bax/Bcl‐2 ratio either through increased expression of Bax by Pongapin and Plumbagin or low expression of Bcl‐2 by Karanjin. Thus, Pongapin and Karanjin may be potential natural anticancer agents in the future, like Plumbagin.     

HPLC测定不同采收途径及不同部位白花丹中白花丹醌的含量

目的:分析不同采收途径及不同部位的白花丹中白花丹醌含量,寻找富集白花丹醌的药用部位和白花丹的最佳采收途径。方法:采用HPLC法测定不同采收途径白花丹和不同部位中白花丹醌的含量:色谱柱为Hypersil ODS(25cm×4.6mm,25μm),流动相为甲醇-水(65∶35),流速为1.0mL/min,检测波长为213nm,柱温30℃。结果:白花丹醌在0.01μg～0.32μg含量范围呈线性关系,Y=18211600X+10434.57758,r=0.99946,RSD=1.28%(n=6);新鲜的白花丹根部、茎部及叶中白花丹醌的含量分别为0.026%、0.006%和0.014%;干燥的白花丹根部、茎部及叶中白花丹醌的含量分别为0.324%、0.082%和0.174%;枯萎的白花丹茎部、叶及穗中白花丹醌的含量分别为0.002%、0.001%和0.003%。结论:干燥组白花丹中白花丹醌含量高于新鲜组和枯萎组,白花丹根部的白花丹醌含量最高,其次是穗,叶、茎。本法简便、准确,灵敏度高,重复性好,可用于控制白花丹药材的质量。     

改构型酸性成纤维细胞生长因子对白花丹素诱导的人胚肝细胞L-O2损伤的保护作用

目的研究改构型酸性成纤维细胞生长因子(aFGF)对白花丹素引起的人胚肝细胞L-O2损伤的保护作用及机理。方法用白花丹素体外诱导肝细胞损伤,同时用aFGF对肝细胞进行保护,测定培养上清液中的SOD,MDA,LDH值,MTT法测定肝细胞活性。结果与损伤组比较,aFGF对白花丹素引起的胚肝细胞损伤有明显的保护作用(P<0.05)。结论 aFGF可保护肝细胞,其机制可能与其拮抗自由基产生有关。