过氧化物酶体增殖因子激活受体γ介导5-烯丙基-7-二氟亚甲基白杨素诱导人卵巢癌CoC1细胞凋亡的研究

Objective To investigate induction of apoptosis of human ovarian cancer CoC1 cells by 5-allyl-7-gen-difluoromethylenechrysin(ADFMChR)in vitro,and its molecular mechanism. Methods The proliferative and growth inhibition of CoC1 cells treated with ADFMChR was respectively measured using(3,4,5-dimethylthiazol-2-yl)2,5-diphenyl tetrazolium bromide(MTT)colorimetric assay and clone-formation in soft agar assay. The apoptosis of CoC1 cells induced by ADFMChR was determined by DNA agarose gel electrophoresis assay. Effect of ADFMChR on PPAR-γ, Bcl-2. Bax protein expression level of CoC1 cells was detected by western blotting. Results The proliferation of CoC1 cells could be significantly inhibited by ADFMChR in a dose-dependent manner. The IC50 was 7. 76 μmol/L The ladder-shaped band could be shown in DNA agarose gel electrophoresis after treatment with ADFMChR at 30. 0 μmol/L for 48 h and the ladder-shape band disappeared with GW9662. Western blot analysis showed that expression of PPAR-γ and Bax proteins were up-regulated and protein levels of Bcl-2 were depressed after treatment with ADFMChR in a concentration-dependent fashion. However,the effects of ADFMChR on Bcl-2 and Bax proteins were blocked or diminished in the presence of GW9662. Conclusions The effect of ADFMChR on induction of apoptosis in CoC1 cells may be mediated by activation of PPAR-γ, sequentially accompanied by reducing of protein levels of Bcl-2 and increasing of Bax expression.     

过氧化物酶体增殖因子激活受体γ介导5-烯丙基-7-二氟亚甲基白杨素诱导人卵巢癌CoC1细胞凋亡的研究

Objective To investigate induction of apoptosis of human ovarian cancer CoC1 cells by 5-allyl-7-gen-difluoromethylenechrysin(ADFMChR)in vitro,and its molecular mechanism. Methods The proliferative and growth inhibition of CoC1 cells treated with ADFMChR was respectively measured using(3,4,5-dimethylthiazol-2-yl)2,5-diphenyl tetrazolium bromide(MTT)colorimetric assay and clone-formation in soft agar assay. The apoptosis of CoC1 cells induced by ADFMChR was determined by DNA agarose gel electrophoresis assay. Effect of ADFMChR on PPAR-γ, Bcl-2. Bax protein expression level of CoC1 cells was detected by western blotting. Results The proliferation of CoC1 cells could be significantly inhibited by ADFMChR in a dose-dependent manner. The IC50 was 7. 76 μmol/L The ladder-shaped band could be shown in DNA agarose gel electrophoresis after treatment with ADFMChR at 30. 0 μmol/L for 48 h and the ladder-shape band disappeared with GW9662. Western blot analysis showed that expression of PPAR-γ and Bax proteins were up-regulated and protein levels of Bcl-2 were depressed after treatment with ADFMChR in a concentration-dependent fashion. However,the effects of ADFMChR on Bcl-2 and Bax proteins were blocked or diminished in the presence of GW9662. Conclusions The effect of ADFMChR on induction of apoptosis in CoC1 cells may be mediated by activation of PPAR-γ, sequentially accompanied by reducing of protein levels of Bcl-2 and increasing of Bax expression.     

5-烯丙基-7-二氟亚甲基白杨素对体外培养人卵巢癌细胞作用的初步探讨

目的 探讨5-烯丙基-7-二氟亚甲基白杨素（ADFMChR）对体外培养人卵巢癌细胞系COCl细胞的作用。方法 体外培养中国仓鼠正常卵巢上皮细胞系（CHO-K1）、人卵巢癌细胞系（COCl），每种细胞实验组中分别加入不同浓度ADFM-ChR，对照组加入等量PBS。采用改良MTT比色法分别检测ADFMChR作用CHO-K1、COCl不同时间后的细胞增殖抑制率，用流式细胞仪分析法分别检测CHO-K1、COCl细胞的细胞周期分布度凋亡率。结果 ADFMChR对COCl细胞的增殖具有抑制作用，呈剂量依赖性和时间依赖性，对CHO-K1细胞的增殖抑制作用弱，差异有显著性（P〈0．01）。ADFMChR作用于COCl细胞后细胞周期分布及凋亡率与CHO-K1细胞比较，G0/G1期细胞明显增多，且G1期细胞前出现明显的亚G1凋亡峰。结论 ADFMChR对卵巢癌细胞系COCl的增殖具有明显的抑制作用，呈剂量-效应关系和时间-效应关系。     

过氧化物酶体增殖物激活受体γ与动脉粥样硬化

过氧化物酶体增殖物激活受体γ(PPARγ)是核转录因子中的超家族成员,它调控靶基因的转录,参与体内的许多病理生理过程。PPARγ通过改善胰岛素抵抗,糖代谢、脂代谢紊乱,发挥抗动脉粥样硬化作用;还可通过对巨噬细胞及核因子κB的影响,通过抑制炎症反应,抑制平滑肌细胞增殖、迁移,通过对血管内皮功能的影响,调节血管张力,阻止动脉粥样硬化的形成。     

过氧化物酶体增殖物激活受体γ与肿瘤

过氧化物酶体增殖物激活受体γ(PPAR-γ)是配体激活的转录因子家族的成员之一。PPAR-γ与脂肪细胞分化、胰岛素抵抗、糖代谢、炎症、免疫反应及器官纤维化等多种生物过程有关,成为研究的热点。此外,在体外和体内研究表明,PPAR-γ具有抗肿瘤效应,如诱导细胞凋亡、抑制肿瘤血管生成和转移。本文就PPAR-γ在抗肿瘤方面的作用及研究进展进行简述。     

过氧化物酶体增殖物激活受体γ与肾脏关系研究进展

过氧化物酶体增殖物激活受体（PPARs）是核受体超家族的一员，可分为PPARα、PPARβ、PPARγ三种亚型，它们均可在不同动物和人类肾组织中表达，并在肾脏的生理和病理过程中发挥重要作用。PPARγ不仅促进脂肪代谢，降低血糖水平，增强胰岛素敏感性，还抑制炎症反应，减轻肾小球硬化，对肾脏具有保护作用，现就PPARγ与肾脏关系的研究进展作一综述。     

过氧化物酶增殖体激活受体γ及其配体

过氧化物酶体增殖物(peroxisome proliferations，PPs)是目前认为最广泛的一种非基因毒性致癌物，是一类结构不同的化合物，包括驱虫剂、白三烯D4抑制剂、乙酰水杨酸、降血脂药物、塑料成型剂、除草剂、冷却剂、润滑剂等，此类物质可以引起啮齿类动物肝细胞体积变大，过氧化物酶体增牛。1990年Issemann和Green克降出一类能被PP类物质激活的受体—过氧化物酶增殖体激活受体γ(peroxisome proliferators actived receptors，PPARs)，PPARs属     

7-二氟亚甲基-5-取代烷氧基黄酮类化合物的合成及其对人胃癌细胞增殖的抑制作用

目的设计和合成系列7-二氟亚甲基-5-取代烷氧基黄酮类化合物，观察其对人胃癌细胞增殖抑制作用。方法以白杨素（chrysin，5，7-二羟基黄酮，CbR）为先导化合物，先选择性地用二氟亚甲基取代ChR的7-羟基，合成化合物chR-1，再将一系列烷氧基取代chR-1的5-羟基，依次合成化合物ChR-2…chR-10。采用MTT比色法测定白杨素及白杨素衍生物对人胃癌SGC-7901细胞增殖抑制作用。结果合成10种7-二氟亚甲基-5-取代烷氧基黄酮类化合物，并分别进行波谱鉴定，其结构与设计相符；白杨素及白杨素衍生物对人胃癌细胞株SGC-7901具有不同程度的增殖抑制作用，其中ChR的IC50值为5．83μmoL，在ChR的C-7住引入二氟亚甲基合成的ChR-1的IC50值为3．98μmoL，表明其抑制人胃癌细胞增殖作用增强；进一步在ChR-1的C-5位引入烯丙氧基合成的ChR-10的IC50值为2．18μmoL，其IC50值为所有合成的7-二氟亚甲基-5-取代烷氧基黄酮类化合物中最低，表明其抑制SGC-7901细胞增殖作用最强。结论二氟亚甲基的C-7位取代获得白杨素衍生物的抑制人胃癌细胞增殖活性增强；在此基础上烯丙氧基的C-5住取代获得的7-二氟亚甲基-5-烯丙基白杨素具有更强的抑制人胃癌细胞增殖活性。     

硝苯地平对哮喘小鼠肺组织过氧化物酶体增殖物激活受体-γ和脂联素受体表达的影响

目的:探讨硝苯地平对哮喘小鼠肺组织过氧化物酶体增殖物激活受体-γ(PPAR-γ)和脂联素受体(AdipoRs)表达的影响及可能机制。方法:小鼠随机分为正常对照组(A组)、哮喘组(B组)和硝苯地平干预组(C组)、硝苯地平联合PPAR-γ抑制剂GW9662干预组(D组),每组6只。建立哮喘模型并收集肺泡灌洗液(BALF),检测BALF中细胞计数及分类,实时荧光定量PCR和Westernblot方法检测肺组织PPAR-γ和AdipoRs的表达。结果:与A组比较,B组气道炎症细胞数增多,PPAR-γ表达增加,AdipoRs表达下降(均P<0.05)。C组较B组炎症细胞数下降,PPAR-γ表达增加,AdipoRs表达增加(均P<0.05)。D组炎症细胞数较C组升高,肺组织几乎无PPAR-γ表达,AdipoRs表达水平减少(均P<0.05)。结论:硝苯地平可通过上调PPAR-γ表达,增加AdipoRs的表达,减少炎症细胞的浸润,抑制气道炎症。     

过氧化物酶体增殖物激活受体与动脉粥样硬化研究进展

过氧化物酶体增殖物激活受体（peroxisome proliferator activated receptors，PPARs）属于核受体超家族配体激活的转录因子。经转录激活靶基因，可影响脂质代谢、糖稳态、细胞增殖、分化和凋亡，以及炎症反应。目前，动脉粥样硬化被认为是一种慢性炎症反应。因此，PPARs激活通过调节新陈代谢及抗炎的双重作用影响动脉粥样硬化的发展。本文综述PPARs的结构和分布、PPARs配体、PPARs与动脉粥样硬化的关系。     

Synthetic phosphoethanolamine induces cell cycle arrest and apoptosis in human breast cancer MCF-7 cells through the mitochondrial pathway

Phosphoethanolamine (Pho-s) is a compound involved in phospholipid turnover, acting as a substrate for many phospholipids of the cell membranes. In a recent study, we showed that Pho-s has antitumor effect in the several tumor cells. In this study we evaluated the antitumor activity of synthetic Pho-s on MCF-7 breast cancer cells. Here we demonstrate that Pho-s is cytotoxic to MCF-7 cells in a dose-dependent manner, while it is cytotoxic to MCF10 only at higher concentrations. In addition, Pho-s induces a disruption in mitochondrial membrane potential (Δψm). Furthermore, Pho-s induces mitochondria aggregates in the cytoplasm and DNA fragmentation of MCF-7 cells visualized by confocal microscopy. In agreement with the reduction on Δψm, we showed that Pho-s induces apoptosis followed by an increase in cytochrome c expression and capase-3-like activity in MCF-7 cells. Our results demonstrate that Pho-s induces a cell cycle arrest in the G1 phase through an inhibition of cyclin D1 and stimulates p53. An additional highlight of this study is the finding that Pho-s inhibits Bcl-2, inducing apoptosis through the mitochondrial pathway. Taken together, these results show that Pho-s is a promising compound in the fight against cancer.     

超声辐照联合造影微泡和盐酸阿霉素对不同卵巢癌细胞的凋亡效果评价

目的观察超声辐照联合造影微泡（SonoVue）和盐酸阿霉素（DOX）对不同卵巢癌细胞的凋亡效果,并比较同一超声波辐照剂量、超声微泡和DOX浓度杀伤两株卵巢癌细胞之间的差异。方法 MTT法检测DOX对卵巢癌A2780s细胞的毒性作用,并计算出24 h的50%抑制浓度（IC50）值。将A2780s和SKOV3两株卵巢癌细胞均分为对照组（C组）、单纯DOX组（D组）、超声＋DOX组（U＋D组）、超声＋微泡＋DOX组（U＋M＋D组）。用相同参数（超声辐照声强为0.5 W/cm2、照射时间为30 s、超声脉冲波频率为1.0 MHz）的超声波辐照,并加入相同剂量的DOX（终浓度为1.0μg/ml）及微泡（W/V为10%）,以MTT法检测两株卵巢癌细胞的各组细胞存活率;倒置显微镜观察两株卵巢癌细胞的形态学变化;并用Hoechst染色法观察A2780s卵巢癌细胞中各组细胞的凋亡情况。结果 DOX对卵巢癌A2780s细胞的IC50值约为1.0μg/ml。MTT检测发现,各处理组A2780s细胞的存活率分别为（58.2±2.5）%、（54.4±3.2）%、（52.4±1.0）%,SKOV3细胞的存活率分别为（71.4±5.9）%、（60.1±3.6）%、（58.0±4.6）%,各处理组A2780s与SKOV3细胞与各自对照组相比均有明显的增殖抑制（对照组细胞存活率均假设为100%）,但同一细胞株的各处理组间细胞存活率比较,差异无统计学意义;各处理组A2780s细胞存活率略低于对应组SKOV3细胞存活率,但差异无统计学意义;倒置显微镜观察发现各处理组A2780s与SKOV3卵巢癌细胞均出现形态学变化;Hoechst染色法进一步发现各处理组A2780s细胞核存在凋亡现象,凋亡的细胞核数量有如下趋势：对照组〈D组〈U＋D组〈U＋M＋D组,但差异无统计学意义。结论 DOX（终浓度为1.0μg/ml）体外能诱导卵巢癌细胞凋亡,但超声辐照（辐照声强为0.5 W/cm2、辐照时间为30 s、脉冲频率为1.0 MHz）与10%微泡（W/V）联合DOX并未导致该凋亡率显著增加,同时两株不同的卵巢癌     

溶血磷脂酸在卵巢癌细胞内HER2/neu的激活作用

目的探索溶血磷脂酸(LPA)在卵巢癌细胞内HER2/neu的激活作用。方法通过免疫沉淀反应和蛋白印迹法检测卵巢癌细胞中HER2的变化。结果 LPA能诱导卵巢癌细胞中HER2的快速和瞬态的磷酸化。结论 LPA在卵巢癌细胞中作为HER2的上游分子,对卵巢癌细胞有强有力的刺激,可诱导卵巢癌细胞中HER2磷酸化。     

沉默RAGE对人卵巢癌细胞株增殖、凋亡能力及周期分布的影响

目的 研究沉默晚期糖基化终产物受体(receptor for advanced glycosylation end products,RAGE)对人卵巢癌细胞株增殖、凋亡能力及周期分布的影响.方法 人上皮性卵巢癌SKOV-3细胞经过慢病毒载体构建,分为空白组、过表达组和沉默组.进行细胞增殖、细胞凋亡、细胞周期实验,We...     

三氧化二砷诱导卵巢癌细胞系SKOV3细胞凋亡的作用和机制

目的观察三氧化二砷(ATO)诱导人卵巢癌细胞系SKOV3细胞的凋亡作用和凋亡通路分子caspase 3、PARP,凋亡相关蛋白p-AKT、AKT蛋白表达的变化。方法分别用不同剂量的三氧化二砷作用人卵巢癌细胞系SKOV3细胞,应用MTT比色法检测培养48 h的细胞存活率,应用流式细胞仪测定培养48 h细胞凋亡的变化,免疫印迹法检测凋亡蛋白caspase 3、PARP和凋亡相关蛋白p-AKT、AKT的表达情况。结果 MTT示三氧化二砷能明显抑制SKOV3细胞增殖;流式细胞术显示三氧化二砷诱导SKOV3细胞凋亡,且具有明显的剂量依赖性;Western blotting检测发现药物能显著下调caspase 3、PARP、p-AKT的表达水平。结论三氧化二砷能显著抑制人卵巢癌细胞系SKOV3细胞增殖,诱导其凋亡,激活凋亡通路分子caspase 3、PARP,下调p-AKT蛋白表达水平,这可能是三氧化二砷诱导人卵巢癌细胞SKOV3细胞凋亡的作用机制。     

Induction of cancer cell death by apoptosis and slow release of 5-fluoracil from metal-organic frameworks Cu-BTC

This study aimed to evaluate the mechanism associated with cytotoxic activity displayed by the drug 5-fluorouracil incorporated in Cu-BTC MOF and its slow delivery from the Cu-BTC MOF. Structural characterization encompasses elemental analysis (CHNS), differential scanning calorimetry (DSC), thermogravimetric analysis (TG/DTG), Fournier transform infrared (FIT-IR) and X-ray diffraction (XRD) was performed to verify the process of association between the drug 5-FU and Cu-BTC MOF. Flow cytometry was done to indicate that apoptosis is the mechanism responsible for the cell death. The release profile of the drug 5-FU from Cu-BTC MOF for 48 hours was obeisant. Also, the anti-inflammatory activity was evaluated by the peritonitis testing and the production of nitric oxide and pro-inflammatory cytokines were measured. The chemical characterization of the material indicated the presence of drug associated with the coordination network in a proportion of 0.82 g 5-FU per 1.0 g of Cu-BTC MOF. The cytotoxic tests were carried out against four cell lines: NCI-H292, MCF-7, HT29 and HL60. The Cu-BTC MOF associated drug was extremely cytotoxic against the human breast cancer adenocarcinoma (MCF-7) cell line and against human acute promyelocytic leukemia cells (HL60), cancer cells were killed by apoptosis mechanisms. The drug demonstrated a slow release profile where 82% of the drug was released in 48 hours. The results indicated that the drug incorporated in Cu-BTC MOF decreased significantly the number of leukocytes in the peritoneal cavity of rodents as well as reduced levels of cytokines and nitric oxide production.     

骨形态发生蛋白7通过PI3K/Akt通路可抑制人髓核细胞的凋亡

背景：骨形态发生蛋白7可促进人髓核细胞的细胞外基质合成,减缓椎间盘退变.近年来,有学者提出其可能通过对抗髓核细胞凋亡从而发挥上述作用,但其进一步的分子机制一直未被详细阐明.目的：观察骨形态发生蛋白7对无血清诱导下发生凋亡的人髓核细胞产生的作用及其对PI3K/Akt通路的影响,分析并探讨骨形态发生蛋白7抑制人髓核细胞凋亡的分子机制.方法：通过改良Pfirrmann分级及相关条件选取12例患者获取椎间盘组织,采用酶消化法获取人髓核细胞后分组实验,以含体积分数15％胎牛血清的培养基正常培养的髓核细胞设为空白组;使用无血清培养基培养48 h诱导凋亡作为阳性对照组;在无血清条件下,通过加入不同剂量的骨形态发生蛋白7以及同时添加PI3K/Akt通路拮抗剂LY294002形成处理组和拮抗组.使用流式细胞术检测各组细胞凋亡率;免疫荧光观察p-Akt表达;蛋白印迹法检测Akt,p-Akt,BAD和Caspase 9等通路蛋白的表达变化.结果与结论：无血清凋亡诱导下,流式细胞术结果显示,随着骨形态发生蛋白7处理浓度上升,髓核细胞凋亡率明显下降,加入LY294002共同作用后细胞凋亡率再次升高（P＜0.05）.p-Akt免疫荧光和蛋白印迹法检测结果进一步表明,与凋亡阳性对照组相比,加入骨形态发生蛋白7的实验组中,p-Akt表达明显增加,其下游凋亡相关蛋白BAD、Caspase 9蛋白表达减少（P＜0.05）,而在同时加入Akt通路拮抗剂LY294002后,p-Akt蛋白表达下降而凋亡相关蛋白的表达又恢复到相对较高的水平（P＜0.05）.结果证明,骨形态发生蛋白7在无血清诱导的人类髓核细胞凋亡中通过激活PI3K/Akt通路,拮抗了BAD-Caspase 9相关的细胞凋亡过程,抑制了髓核细胞的退变.     

The tetravalent anti-DR5 antibody without cross-linking direct induces apoptosis of cancer cells

Tumor necrosis factor-related apoptosis-inducing ligand can induce apoptosis in many tumor cell lines. This apoptotic effect is mediated by interaction of TRAIL and its receptors, which include Death Receptor 4 (DR4) and Death Receptor 5 (DR5). Some antibodies to DR4 or DR5 do not have anti-tumor ability without cross-linking but exhibit anti-tumor ability in the presence of a cross-linking reagent. Here, we suggest that the tetravalent anti-DR5 antibody can induce apoptosis of cancer cells independent of cross-linking reagent. The single-chain variable fragment of the anti-DR5 antibody, HSA (human serum albumin) – p53 gene, comprising residues 490–513 of HSA and the tetramerization domain of human p53 were assembled into the tetravalent antibody by an overlapping PCR. Results of size exclusion HPLC indicated that the purified protein exhibited a major peak (tetramer) and a minor peak (dimer). MTT assay demonstrated the tetravalent antibody without cross-linking could inhibit survival of Jurkat and EC9706 cells in a dose-dependent manner while the monovalent antibody could not inhibit survival of Jurkat and EC9706 cells. IC50 of Jurkat cell was 3.2 mg/L and IC50 of EC9706 cell was 3.9 mg/L. Furthermore, the Annexin V/PI assay and the Hoechst 33258 staining showed that the tetravalent antibody could efficiently induce apoptosis of Jurkat and EC9706 cells. Therefore, the tetravalent anti-DR5 antibody can act as a direct agonistic antibody, and initiate efficient apoptotic independent of cross-linking reagent. Thus, the tetravalent anti-DR5 antibody will be a new kind of candidate for potential cancer therapeutics.