来氟米特与雷公藤多苷治疗IgA肾病对照研究

目的 观察来氟米特(LEF)、雷公藤多苷联合激素治疗IgA肾病的疗效和安全性.方法 收集符合条件的60例中等量蛋白尿IgA肾病患者随机分为2组,试验组LEF联合中等量激素治疗,对照组雷公藤多苷联合中等量激素治疗,观察治疗前、后1、3、6个月的相关临床指标变化,并进行评价.结果 试验组治疗后24 h尿蛋白定量显著减少(P<0.01),血清白蛋白显著升高(P<0.01),完全缓解率为46.4%,总有效率为85.7%.与对照组比较疗效差异无统计学意义(P>0.05).观察组起效快,不良反应轻微,患者耐受性好.结论 来氟米特联合激素可以作为治疗IgA肾病的选择之一,且安全、有效.     

Biologic activity of triptolide in t(8;21) acute myeloid leukemia cells

Triptolide is a compound isolated from the traditional Chinese medicinal herb Tripterygium wilfordii that shows potent anti-tumor activities, but its effects on acute myeloid leukemia with t(8;21) remain unclear. Here we report that triptolide inhibits cell proliferation and induces apoptosis in a dose- and time-dependent manner of t(8;21)-bearing Kasumi-1, SKNO-1 and CD34+ cells harvested from bone marrow samples of patients with t(8;21) leukemia. We show that triptolide triggers cleavage of the resultant AML1-ETO fusion protein of t(8;21), and causes downregulation of C-KIT followed by inhibition of JAK-STAT signaling. Triptolide downregulates p65 and inhibits the DNA-binding activity of NF-κB. Our data indicate that triptolide might be an effective agent for t(8;21) leukemia.     

基于以雷公藤甲素为主要抗癌活性成分的雷公藤毒性研究进展及对策

目的介绍以雷公藤甲素(triptolide,TP)为主要抗癌活性成分的雷公藤的毒性研究进展,并提出研究对策。方法查阅国内外相关资料并对其进行汇总、分析、综述。结果雷公藤抗癌活性成分TP是其诱导肝毒性、生殖毒性、心肌毒性、肾毒性及厌食、腹泻、消瘦、脾肿大、卵巢萎缩等毒副作用的主要毒性成分,且雷公藤的安全窗口窄,用药安全隐患大。结论建议系统开展配伍减毒增效的研究,即开展基于中医药基本理论的配伍减毒增效药物的筛选研究、基于"量-时-效"关系研究的配伍减毒增效研究、基于配伍的雷公藤及TP安全窗口的拓宽优化研究,拓宽雷公藤的安全窗口,最终为其临床安全有效用药提供有意义的参考,并为其它有毒中药的研究提供思路借鉴。     

雷公藤甲素在慢性青光眼大鼠模型中对视网膜神经节细胞的保护

背景青光眼是一种以视神经损害为病理特点的常见致盲性眼病。目前,通过延缓或阻止病程的进展而保护视神经是青光眼研究的热点。目的研究中药雷公藤的有效提取成分雷公藤甲素对慢性青光眼大鼠模型视网膜神经节细胞（RGCs）的保护作用。方法选用清洁级Wistar雌性大鼠80只,采用房水释放联合激光房角光凝法建立慢性青光眼大鼠模型。右眼为激光眼,左眼为对照眼。激光光凝前3d起每日雷公藤甲素组大鼠腹腔给予雷公藤甲素5μg／kg直至处死,生理盐水组以同样的方式给予等量生理盐水。于术前,术后1、3、5d,1周及此后每周用Tono—PenXL眼压计监测眼压。激光光凝术后1、2、4、8周制作大鼠眼球视网膜铺片并行Nissl染色,对RGCs进行定量检测。结果激光眼术后1d眼压较术前增高,术后1周达高峰,持续约3周,4周时眼压恢复正常;对照眼各时间点眼压值与术前相比差异均无统计学意义（P〉0．05）。术后各时间点雷公藤甲素组激光眼与生理盐水组激光眼间眼压的差异无统计学意义（P〉0．05）。生理盐水组激光眼术后1周RGCs数量开始减少,术后4～8周RGCs存活数量明显下降;与生理盐水组激光眼相比,各时间点雷公藤甲素组激光眼RGCs数量明显增多,差异均有统计学意义（P〈0．05）。雷公藤甲素组激光眼与其对照眼相比,各时间点RGCs数目的差异均无统计学意义（P〉0．05）。结论雷公藤甲素能防止慢性青光眼大鼠模型的RGCs损伤,对RGCs具有保护作用,该作用并不依赖于眼压的下降,这可能为青光眼的治疗提出新思路。     

Enhanced Anti-tumor Efficacy of Aspirin Combined with Triptolide in Cervical Cancer Cells

Background: The non-steroidal anti-inflammatory drug (NSAID) aspirin (acetylsalicylic acid) is an inhibitor ofcyclooxygenase enzymes. Recent studies have shown that aspirin could be used as an anti-tumor drug. Triptolide,the major compound extracted from the Chinese herb Tripteryglum wilfordii Hook.f, has now been shown that itcan inhibit tumor growth. The aim of this study was to analyze the anti-tumor efficiency of aspirin and triptolidein cervical cancer cells. Methods: Viability of cervical cancer cell lines was assessed by the MTT method atvarious concentrations of aspirin and triptolide. Siha and HeLa cell apoptotic analysis was performed by flowcytometry. Real time-PCR and Western Blotting were used to analyze the expression of Bcl-2/Bax, Cyclin D1 andp16. Results: Viability in the combination group was significantly decreased as compared with either drug usedalone. Expression change of Bcl-2/Bax, CyclinD1 and p16 appeared to play an important role in the synergistickilling effect on cervical cancer cell apoptosis. Conclusion: Aspirin and triptolide combination treatment mayhave synergistic anti-tumor effects on cervical cancer cells.     

Combined Effects of Curcumin and Triptolide on an Ovarian Cancer Cell Line

Background: As natural medicines in Asia, curcumin and triptolide extracted from different drug plants haveproven to possess anticancer potential and widely used for anti-cancer research. The present study attempted toclarify that curcumin and triptolide synergistically suppress ovarian cancer cell growth in vitro. Methods: To testsynergic effects, cell viability and apoptosis were analyzed after curcumin and triptolide combination treatmenton ovarian cancer cell lines. Synergistic effects on apoptosis induction were determined by lactate dehydrogenase(LDH) leakage assay, intracellular reactive oxygen species (ROS) assay, mitochondrial membrane potential(MMP) loss assay and flow cytometry analysis. Critical regulators of cell proliferation and apoptosis relatedwere analyzed by qRT-PCR and Western blotting. Results: We showed that the combination of curcumin andtriptolide could synergistically inhibit ovarian cancer cell growth, and induce apoptosis, which is accompanied byHSP27 and HSP70, indicating that HSP27 and HSP70 play the important role in the synergic effect. Conclusions:From the result present here, curcumin and triptolide combination with lower concentration have a synergisticanti-tumor effect on ovarian cancer and which will have a good potential in clinical applications.     

Triptolide inhibits proliferation and induces apoptosis of human melanoma A375 cells

Triptolide, a diterpenoid obtained from Tripteryglum wilfordii Hook.f, has attracted interest for its anti- tumor activities against human tumor cell lines in recent years. This report focuses on anti-proliferative and pro-apoptotic activities in human melanoma A375 cells assessed by CCK8 assay, Hoechst 33258 staining and flow cytometry. In addition, triptolide-induced arrest in the S phase was also observed. Caspase assays showed the apoptosis induced by triptolide was caspase-dependent and probably through intrinsic apoptotic pathways. Furthermore, expression of NF-κB (p65) and its downstream factors such as Bcl-2, Bcl-XL was down-regulated. Taken together, the data indicate that triptolide inhibits A375 cells proliferation and induces apoptosis by a caspase-dependent pathway and through a NF-κB-mediated mechanism.     

雷公藤甲素通过抑制逆转录病毒HERV-K Np9基因转录诱导人急性T淋巴细胞白血病Jurkat细胞凋亡

目的探讨雷公藤甲素诱导人急性T淋巴细胞白血病Jurkat细胞凋亡分子机制。方法MTT检测雷公藤甲素对Jurkat细
胞的增殖抑制作用,然后用OriginPro8计算出IC50。按照0、2、4、8、16 nmol/L浓度雷公藤甲素处理Jurkat细胞48 h,然后用流式
细胞仪检测细胞凋亡变化。用半定量RT-PCR法检测加药处理后各组Np9基因mRNA的表达水平变化并用Kodak 1D 3.6软件
对条带进行定量分析。采用统计软件分析Np9转录抑制与细胞凋亡的相关性。Western Blotting检测Np9下游信号分子c-myc,
β-catenin,ERK,AKT和Notch1蛋白的变化。结果雷公藤甲素呈剂量依赖性抑制Jurkat细胞的增殖,其IC50为12.7 nmol/L。雷公
藤甲素呈剂量依赖诱导Jurkat细胞凋亡。进一步实验研究结果显示,雷公藤甲素呈剂量依赖方式抑制Jurkat细胞中Np9基因的
mRNA的转录水平。经统计分析发现Np9转录抑制与细胞凋亡之间具有显著的相关性（R2=0.907）。Western Blotting方法结果
发现雷公藤甲素在抑制Np9 mRNA转录同时伴有其下游信号分子c-myc,β-catenin,ERK,AKT和Notch1蛋白表达水平降低。
结论下调HERV-K Np9 mRNA及其下游信号分子c-myc,β-catenin,ERK,AKT和Notch1蛋白水平是雷公藤甲素诱导人急性T
淋巴细胞白血病Jurkat细胞凋亡的重要分子机制之一。
     

雷公藤甲素通过PTEN表达调控Wnt/β-catenin通路抑制黑色素瘤的机制研究

目的:探讨雷公藤甲素的抗黑色素瘤作用是否与PTEN表达及Wnt/β-catenin通路相关。方法:实验分为5组:空白对照组、雷公藤甲素(20 nmol/L)组、β-catenin抑制剂(5μmol/L IWR-1-endo)组、雷公藤甲素+β-catenin抑制剂组、ATRA(100μmol/L)组。分别采用CCK8法、Annexin V-FITC/PI双染色法、实时定量PCR法和Western blot法检测各组A375细胞活力、凋亡率及PTEN、β-catenin、Bcl-2、Caspase-3、PCNA mRNA及蛋白的表达。结果:雷公藤甲素、β-catenin抑制剂和ARTA处理能抑制A375细胞的增殖并诱导其凋亡,在增强Caspase-3和PTEN表达的同时抑制β-catenin、Bcl-2、PCNA的表达。结论:雷公藤甲素能抑制黑色素瘤细胞A375的增殖并诱导其凋亡,该作用可能是通过增加PTEN的表达进而抑制Wnt/β-catenin通路的激活来实现。