6-姜烯酚诱导 SW480 凋亡及与 APC 表达的影响

本文通过体外细胞实验观察研究 6-姜烯酚诱导结直肠癌细胞凋亡及与 APC 表达的关系,以探讨 6-姜烯酚抑制结直肠肿瘤的可能机制。首先通过体外细胞实验应用不同浓度 6-姜烯酚（0、5、10、15 和 20 μM）分别对 SW480 进行干预诱导 24 h,再利用高倍荧光显微镜观察细胞数目、形态变化,CCK8 法测定细胞抑制率,Annexin V-FITC/PI 流式细胞术检测细胞凋亡率及细胞凋亡周期,最后用 Western-blot 检测分析 APC 蛋白表达变化。结果显示,与对照组相比,6-姜烯酚可致使 SW480 细胞增殖周期阻断在 G2/M 期,并呈浓度依赖性地促进 SW480 凋亡,进而抑制细胞增殖,而且增强了 APC 表达（plt;0.05）。因此,可以得出 6-姜烯酚可诱导 SW480凋亡从而抑制细胞增殖,并且可能与激活 APC 相关,随着这一研究的不断深入,6-姜烯酚作为临床潜在的抗肿瘤辅助药物,其抑制肿瘤细胞增殖将得到更深层次分子机制的支持。     

6-姜烯酚诱导SW480凋亡及对APC基因表达的影响

本文通过体外细胞实验观察研究6-姜烯酚诱导结直肠癌细胞凋亡及与APC(肿瘤抑制基因)表达的关系,以探讨6-姜烯酚抑制结直肠肿瘤的可能机制。首先通过体外细胞实验应用不同浓度6-姜烯酚(0、5、10、15和20μM)分别对SW480进行干预诱导24 h,再利用高倍荧光显微镜观察细胞数目、形态变化,CCK8法测定细胞抑制率,Annexin V-FITC/PI流式细胞术检测细胞凋亡率及细胞凋亡周期,最后用Western-blot检测分析APC蛋白表达变化。结果显示,与对照组相比,6-姜烯酚可致使SW480细胞增殖周期阻断在G2/M期,并呈浓度依赖性地促进SW480凋亡,进而抑制细胞增殖,而且增强了APC表达(p0.05)。因此,可以得出6-姜烯酚可诱导SW480凋亡从而抑制细胞增殖,并且可能与激活APC相关,随着这一研究的不断深入,6-姜烯酚作为临床潜在的抗肿瘤辅助药物,其抑制肿瘤细胞增殖将得到更深层次分子机制的支持。     

6-姜烯酚诱导 SW480 凋亡及与 APC 表达的影响

本文通过体外细胞实验观察研究 6-姜烯酚诱导结直肠癌细胞凋亡及与 APC 表达的关系,以探讨 6-姜烯酚抑制结直肠肿瘤的可能机制。首先通过体外细胞实验应用不同浓度 6-姜烯酚（0、5、10、15 和 20 μM）分别对 SW480 进行干预诱导 24 h,再利用高倍荧光显微镜观察细胞数目、形态变化,CCK8 法测定细胞抑制率,Annexin V-FITC/PI 流式细胞术检测细胞凋亡率及细胞凋亡周期,最后用 Western-blot 检测分析 APC 蛋白表达变化。结果显示,与对照组相比,6-姜烯酚可致使 SW480 细胞增殖周期阻断在 G2/M 期,并呈浓度依赖性地促进 SW480 凋亡,进而抑制细胞增殖,而且增强了 APC 表达（plt;0.05）。因此,可以得出 6-姜烯酚可诱导 SW480凋亡从而抑制细胞增殖,并且可能与激活 APC 相关,随着这一研究的不断深入,6-姜烯酚作为临床潜在的抗肿瘤辅助药物,其抑制肿瘤细胞增殖将得到更深层次分子机制的支持。     

6-姜烯酚诱导 SW480 凋亡及与 APC 表达的影响

本文通过体外细胞实验观察研究 6-姜烯酚诱导结直肠癌细胞凋亡及与 APC 表达的关系,以探讨 6-姜烯酚抑制结直肠肿瘤的可能机制。首先通过体外细胞实验应用不同浓度 6-姜烯酚（0、5、10、15 和 20 μM）分别对 SW480 进行干预诱导 24 h,再利用高倍荧光显微镜观察细胞数目、形态变化,CCK8 法测定细胞抑制率,Annexin V-FITC/PI 流式细胞术检测细胞凋亡率及细胞凋亡周期,最后用 Western-blot 检测分析 APC 蛋白表达变化。结果显示,与对照组相比,6-姜烯酚可致使 SW480 细胞增殖周期阻断在 G2/M 期,并呈浓度依赖性地促进 SW480 凋亡,进而抑制细胞增殖,而且增强了 APC 表达（plt;0.05）。因此,可以得出 6-姜烯酚可诱导 SW480凋亡从而抑制细胞增殖,并且可能与激活 APC 相关,随着这一研究的不断深入,6-姜烯酚作为临床潜在的抗肿瘤辅助药物,其抑制肿瘤细胞增殖将得到更深层次分子机制的支持。     

6-姜烯酚诱导人结直肠癌细胞凋亡及与Bax、BCL2、Caspase3和PARP1基因表达的影响

本文通过体外细胞实验应用6-姜烯酚对HCT116和HT29进行干预,以探讨6-姜烯酚诱导结直肠癌细胞凋亡及与相关凋亡蛋白(Bax、BCL2、Caspase3和PARP1)表达之间的关系。利用倒置荧光显微镜观察不同浓度的6-姜烯酚干预HCT116及HT29后细胞形态的变化,CCK8法测定不同分组HCT116及HT29抑制率,并绘制细胞增殖曲线,Annexin V-FITC/PI流式细胞术检测不同分组HCT116及HT29凋亡,Western-blot检测分析凋亡相关蛋白表达情况(Bax、BCL2、Caspase3和PARP1)。结果显示,与对照组相比,6-姜烯酚可不同程度地诱导HCT116及HT29凋亡,促进Bax、Caspase3和PARP1蛋白水平表达(p0.05),抑制BCL2蛋白水平表达(p0.05),并增加Bax/BCL2比值比例(p0.05)。因此,6-姜烯酚诱导HCT116、HT29发生凋亡可能是与激活Bax、Caspase3和PARP1的表达以及增加Bax/BCL2比值比例相关,这一发现可为结直肠癌的临床治疗与预防提供有效参考依据。     

6-姜烯酚诱导 SW480 凋亡及与 APC 表达的影响

本文通过体外细胞实验观察研究 6-姜烯酚诱导结直肠癌细胞凋亡及与 APC 表达的关系，以探讨 6-姜烯酚抑制结直肠肿瘤的可能机制。首先通过体外细胞实验应用不同浓度 6-姜烯酚（0、5、10、15 和 20 μM）分别对 SW480 进行干预诱导 24 h，再利用高倍荧光显微镜观察细胞数目、形态变化，CCK8 法测定细胞抑制率，Annexin V-FITC/PI 流式细胞术检测细胞凋亡率及细胞凋亡周期，最后用 Western-blot 检测分析 APC 蛋白表达变化。结果显示，与对照组相比，6-姜烯酚可致使 SW480 细胞增殖周期阻断在 G2/M 期，并呈浓度依赖性地促进 SW480 凋亡，进而抑制细胞增殖，而且增强了 APC 表达（plt;0.05）。因此，可以得出 6-姜烯酚可诱导 SW480凋亡从而抑制细胞增殖，并且可能与激活 APC 相关，随着这一研究的不断深入，6-姜烯酚作为临床潜在的抗肿瘤辅助药物，其抑制肿瘤细胞增殖将得到更深层次分子机制的支持。     

小球藻精油对人结肠癌细胞增殖和凋亡的作用

目的:分析小球藻精油的主要成分,研究其对人结肠癌细胞的生长抑制和凋亡诱导作用机制。方法:GCMS分析小球藻精油的挥发性成分,用不同含量的小球藻精油处理人结肠癌细胞(HT29细胞),采用四甲基偶氮唑蓝(MTT)法检测细胞增殖,流式细胞仪检测细胞凋亡率,分析细胞周期。结果:小球藻精油的主要成分为十六烷(49.69%)、乙酸(17.51%)、乙酸乙酯(10.36%)、甲苯(9.95%)、正十四碳烷(7.96%)、2,4-二甲基环己醇(2.94%)等,其羟基及不饱和双键是抗肿瘤作用的结构基础。与对照组相比,小球藻精油呈剂量依赖性抑制HT29细胞增殖(P0.01),并引起明显的细胞周期阻滞,将细胞周期阻滞在S(G2/M)期,从而促进细胞凋亡。结论:小球藻精油的挥发性成分和脂肪酸对结肠癌细胞具有增殖抑制效应及凋亡诱导效应,是一种具有发展潜力的抗结肠癌药物。     

二氢杨梅素对骨肉瘤细胞增殖的抑制作用

本研究旨在探讨二氢杨梅素对骨肉瘤细胞增殖的抑制作用及其机制。采用MTT法检测不同浓度的二氢杨梅素溶液对骨肉瘤细胞增殖的抑制作用;采用倒置显微镜、Hoechst 33258荧光染色法和流式细胞术检测不同浓度的二氢杨梅素溶液对骨肉瘤细胞形态、凋亡和周期的影响;并进一步采用Western Blot法分析细胞周期蛋白和凋亡蛋白表达的影响。研究结果表明二氢杨梅素对骨肉瘤细胞增殖具有显著的抑制作用,细胞形态发生了明显变化,呈显著的剂量依赖型,其半数抑制浓度（IC50）值为24.41±1.25 μM。细胞周期实验结果表明,经二氢杨梅素处理后,G0/G1期细胞数百分比从60.20%下降到21.50%,而G2/M细胞数百分比从11.60%增加到45.30%,细胞周期蛋白Cyclin B1表达下降引起细胞周期阻滞;此外,抗凋亡蛋白Bcl-2表达和促凋亡蛋白Bax表达的比例显著下降,从而诱导细胞发生凋亡。结果表明二氢杨梅素具有显著的抗骨肉瘤增殖活性,可开发一种潜在的治疗骨肉瘤的功能食品或药物。     

6-姜烯酚对H_2O_2诱导NCM460和HCT116氧化损伤的作用研究

建立结直肠癌细胞氧化损伤模型,加入H_2O_2刺激,通过体外细胞实验研究6-姜烯酚对H_2O_2诱导人正常肠上皮细胞(NCM460)和原位结肠癌细胞(HCT116)氧化损伤的不同作用及可能的分子机制。利用倒置显微镜观察不同浓度6-姜烯酚对H_2O_2诱导NCM460和HCT116后细胞形态的改变。CCK8法筛选6-姜烯酚的浓度区间,并测定细胞存活率。Annexin V-FITC/PI流式细胞术检测不同分组细胞凋亡。Western-blot检测分析相关凋亡蛋白(Caspase3、PARP1、MCC1、A2F、BCL2)的表达。结果显示,与对照组相比,6-姜烯酚可降低H_2O_2诱导的NCM460中Caspase3、PARP1、MCC1、A2F表达,促进BCL2的表达(p0.05),具有抗氧化作用,并促进H_2O_2诱导的NCM460增殖(p0.05),但是在HCT116中。6-姜烯酚却促进Caspase3、PARP1、MCC1、A2F表达,抑制BCL2表达(p0.05),不同程度加强H_2O_2对HCT116的氧化损伤,抑制细胞增殖(p0.05)。因此可以得出6-姜烯酚对H_2O_2诱导NCM460及HCT116具有明显不同的相反作用,这一发现可为进一步研究6-姜烯酚抗结直肠肿瘤具体相关机制或通路提供指导意义。     

代代花总黄酮对3T3-L1细胞增殖活性的影响

本文研究了代代花总黄酮抑制3T3-L1细胞增殖及诱导其凋亡的作用。不同浓度的代代花总黄酮作用于3T3-L1细胞24 h之后,采用MTT法检测代代花总黄酮对细胞增殖的抑制作用;使用倒置显微镜观察细胞形态学的变化;Annexin V-EGFP/PI标记检测细胞凋亡率;PI标记法检测了代代花总黄酮对细胞周期的影响;活性氧(ROS)试剂盒检测细胞内ROS水平;荧光定量PCR检测了凋亡相关基因的m RNA水平表达。结果表明,高浓度(300μg/m L和400μg/m L)的代代花总黄酮可显著抑制3T3-L1细胞增殖,细胞的抑制率分别为38%和63%,且细胞形态发生了明显变化,并显著升高了细胞内ROS浓度。细胞凋亡实验结果显示,代代花总黄酮可诱导3T3-L1细胞早期凋亡和晚期凋亡,100μg/m L、200μg/m L和300μg/m L代代花总黄酮处理组的细胞早期凋亡率分别为4.6%、15.7%和22.5%;晚期凋亡率分别为14.4%、8.3%和32.2%。而细胞周期实验则表明,处理后3T3-L1细胞G0/G1期细胞数比例从58.9%下降到51.4%,而相应的S期细胞数比例呈小幅度增加,G2/M期细胞数比例变化不明显。凋亡相关基因p21及p53的m RNA表达明显升高及促凋亡基因bax与抗凋亡基因bcl-2比例的升高使3T3-L1进入细胞凋亡程序。     

Textural Properties of Cold-set Gels Induced from Heat-denatured Whey Protein Isolates

A 9% whey protein (WP) isolate solution at pH 7.0 was heat-denatured at 80°C for 30 min. Size-exclusion HPLC showed that native WP formed soluble aggregates after heat-treatment. Additions of CaCl2 (10–40 mM), NaCl (50–400 mM) or glucono-delta-lactone (GDL, 0.4–2.0%, w/v) or hydrolysis by a protease from Bacillus licheniformis caused gelation of the denatured solution at 45°C. Textural parameters, hardness, adhesiveness, and cohesiveness of the gels so formed changed markedly with concentration of added salts or pH by added GDL. Maximum gel hardness occurred at 200 mM NaCl or pH 4.7. Increasing CaCl2 concentration continuously increased gel hardness. Generally, GDL-induced gels were harder than salt-induced gels, and much harder than the protease-induced gel.     

Occurrence of bisphenol-F-diglycidyl ether (BFDGE) in fish canned in oil

The levels of bisphenol-F-diglycidyl ether (BFDGE) were quantified as part of a European survey on the migration of residues of epoxy resins into oil from canned fish. The contents of BFDGE in cans, lids and fish collected from all 15 Member States of the European Union and Switzerland were analysed in 382 samples. Cans and lids were separately extracted with acetonitrile. The extraction from fish was carried out with hexane followed by re-extraction with acetonitrile. The analysis was performed by reverse phase HPL C with fluorescence detection. BFDGE could be detected in 12% of the fish, 24% of the cans and 18% of the lids. Only 3% of the fish contained BFDGE in concentrations considerably above 1mg/kg. In addition to the presented data, a comparison was made with the levels of BADGE (bisphenol-A-diglycidyl ether)analysed in the same products in the context of a previous study.     

Contribution of European research to risk analysis

The European Commission's, Quality of Life Research Programme, Key Action 1—Health, Food & Nutrition is mission-oriented and aims, amongst other things, at providing a healthy, safe and high-quality food supply leading to reinforced consumer confidence in the safety of European food. Its objectives also include the enhancing of the competitiveness of the European food supply. Key Action 1 is currently supporting a number of different types of European collaborative projects in the area of risk analysis. The objectives of these projects range from the development and validation of prevention strategies including the reduction of consumers risks; development and validation of new modelling approaches; harmonization of risk assessment principles, methodologies, and terminology; standardization of methods and systems used for the safety evaluation of transgenic food; providing of tools for the evaluation of human viral contamination of shellfish and quality control; new methodologies for assessing the potential of unintended effects of genetically modified (genetically modified) foods; development of a risk assessment model for Cryptosporidium parvum related to the food and water industries; to the development of a communication platform for genetically modified organism, producers, retailers, regulatory authorities and consumer groups to improve safety assessment procedures, risk management strategies and risk communication; development and validation of new methods for safety testing of transgenic food; evaluation of the safety and efficacy of iron supplementation in pregnant women; evaluation of the potential cancer-preventing activity of pro- and pre-biotic ('synbiotic') combinations in human volunteers. An overview of these projects is presented here.     

低温带皮菜籽粕微粉的不同粒级部分的功能特性

为研究低温带皮菜籽粕微粉的不同粒级部分的功能特性,以经低温脱脂的带皮菜籽粕为原料,经微粉碎后筛分成212~425μm、150~212μm和106~150μm的3个不同粒级的微粉样品,检测这些样品的吸水性、吸油性、乳化性和乳化稳定性、蛋白质体外消化率。结果表明:1 3个不同粒级的微粉样品之间的粗纤维含量存在显著差异,表明三者的结构组成成分有一定差异。23个微粉样品的乳化活性和乳化稳定性随粒度级别的减小而显著增加(P0.01)。33个微粉样品的蛋白质体外消化率随粒度级别的减小而显著增加(P0.01)。4不同粒级带皮菜籽粕微粉样品的吸水性与吸油性受其结构组成物质不同和粒度的双重影响,与粒度的相关性不明显。     

Microbiology of food taints

Fresh and processed foods are often spoilt by the presence of undesirable flavours and odours caused by microbial action. The aim of this paper is to review the current knowledge of microbiologically induced taints that occur in a wide range of foodstuffs, including meats, poultry, fish, crustaceans, milk, dairy products, fruits, vegetables, cereals and cereal products. Examples have been chosen where the compounds responsible for the taint have been identified and sufficient data obtained to demonstrate the involvement of microorganisms. However, in some cases the full identity of the causative organism may not have been elucidated. The types of microorganisms covered by this review include bacteria, fungi, yeasts, actinomycetes and cyanobacteria. Although cyanobacteria do not in general infect foods, their presence in aqueous systems and water supplies can lead to off-flavours in aquatic organisms and processed foodstuffs. Several examples of each of these processes are discussed. Wherever possible, the likely biosynthetic pathway used by the microorganism to produce the offending compound in a foodstuff is indicated.     

Analysis for organic residues from aids to polymerization used to make plastics intended for food contact

Polymers intended for food contact use have been analysed for organic residues which could be attributed to a range of substances employed as polymerization aids (e.g. initiators and catalysts). A wide range of polymers was extracted with solvents and the extracts analysed by gas chromatography-mass spectrometry (GC-MS). The overwhelming majority of substances identified were not derived from aids to polymerization but were oligomers, additives and adventitious contaminants. However, a small number of substances were identified as initiator residues. These included tetramethylsuccinonitrile (TMSN) which was observed in two polymers and it derived from recombination of two azobisisobutyronitrile (AIBN) initiator radicals. Methyl benzoate, benzoic acid, biphenyl and phenyl benzoate were detected in one poly(methyl methacrylate) sample and in two polyvinylchlorides and they are thought to be derived from benzoyl peroxide initiator. TMSN was subsequently targeted for analysis of poly-(methyl methacrylate) plastics using proton nuclear magnetic resonance spectrometry (¹     

Tests of potential functional barriers for laminated multilayer food packages. Part II: Medium molecular weight permeants

Experiments were performed to characterize the kinetics of the permeation of different medium molecular weight model permeants: bisphenol A, warfarin and anthracene, from liquid paraffin, through a surrogate potential functional barrier (25 microns-thick orientated polypropylene--OPP) into the food simulants olive oil and 3% (w/v) acetic acid. The characterization of permeation kinetics generally observed the permeation models previously reported to explain the experimental permeation results obtained for a low molecular weight group of model permeants. In general, the model permeants exhibited behaviour consistent with their relative molecular weights with respect to (a) the time taken to attain steady-state permeation into the food simulant in which they were more soluble, (b) their subsequent steady-state permeation rates, and (c) their partition between liquid paraffin and the OPP membrane.     

The development of reference materials for paralytic shellfish poisoning toxins in lyophilized mussel. I: Interlaboratory studies of methods of analysis

This paper describes the first part of a project undertaken to develop mussel reference materials for Paralytic Shellfish Poisoning (PSP) toxins. Two interlaboratory studies were undertaken to investigate the performance of the analytical methodology for several PSP toxins, in particular saxitoxin (STX) and decarbamoyl-saxitoxin (dc-STX) in lyophilized mussels, and to set criteria for the acceptance of results to be applied during the second part of the project: the certification exercise. In the first study, 18 laboratories were asked to measure STX and dc-STX in rehydrated lyophilized mussel material and to identify as many other PSP toxins as possible with a method of their choice. In the second interlaboratory study, 15 laboratories were additionally asked to determine quantitatively STX and dc-STX in rehydrated lyophilized mussel and in a saxitoxin-enriched mussel material. The first study revealed that three out of four postcolumn derivatization methods and one pre-column derivatization method sufficed in principle to determine STX and dc-STX. Most participants (13 of 18) obtained acceptable calibration curves and recoveries. Saxitoxin was hardly detected in the rehydrated lyophilized mussels and results obtained for dc-STX yielded a CV of 58% at a mass fraction of 1.86 mg/kg. Most participants (14 out of 18) identified gonyautoxin-5 (GTX-5) in a hydrolysed extract provided. The first study led to provisional criteria for linearity, recovery and separation. The second study revealed that 6 out of 15 laboratories were able to meet these criteria. Results obtained for dc-STX yielded a CV of 19% at a mass fraction of 3.49mg/kg. Results obtained for STX in the saxitoxin-enriched material yielded a CV of 19% at a mass fraction of 0.34mg/kg. Saxitoxin could not be detected in the PSP-positive material. Hydrolysis was useful to confirm the identity of GTX5 and provided indicative information about C1 and C2 toxins in the PSP-positive material. The methods used in the second interlaboratory study showed sufficiently consistent analysis results to undertake a certification exercise to assign certified values for STX and dc-STX in lyophilized mussel.     

The Ministry of Environmental Protection Issued "Feasible Technology Guidelines for Pollution Prevention and Control in Wood Pulping Process of the Paper Industry (Trial)" and Two Other Guiding Technical Documents

On December 27t＂, 2013, the Ministry of Environmenta Protection announced that, in order to implement ＂The Environmental Protection Law of the People＇ s Republic of China＂, improve the working system in environmenta protection technologies, and promote technologica advancement in pollution prevention, the Ministry of Environmental Protection sponsored the formulation of three guiding technical documents including ＂Feasible Technology Guidelines for Pollution Prevention and Contro n Wood Pulping Process of the Paper Industry （Trial）＂     

1~(st) Intelli-Tissue~ EcoEc Tissue Machine Supplied by PMP Group Successfully Put into Operation in China

正On April 29th,2014,Intelli-Tissue EcoEc tissue machine supplied by PMP Group successfully put into operation at Hebei Xuesong Paper Co.,Ltd.,this is the first such kind of paper machine of PMP Group in China.