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为了研究鸭肠炎病毒感染鸭外周血淋巴细胞的变化趋势,建立了检测鸭外周血淋巴细胞转化的MTS方法,利用该方法检测DEV免疫鸭外周血淋巴细胞变化趋势。结果表明,抗原特异性外周血淋巴细胞转化能力从末次免疫后可持续上升近4周达到高峰,以后快速回落。研究证实MTS法可有效检测鸭抗原特异性外周血淋巴细胞增殖情况。 相似文献
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The study was aimed to research the growth inhibitory effects of two new bioactive peptides Temporin-Lb and Catesbeianin-1a from Rana catesbeiana on human lung cancer NCI-H446 cells, breast cancer MCF-7 cells and mice leukemia K562 cells, and provide the basis for selecting the new peptide antitumor drugs.The second structures of two bioactive peptides were tested by circular dichroism spectrum (CD), and the effects of the two new bioactive peptides on human lung cancer NCI-H446 cells, breast cancer MCF-7 cells and mice leukemia K562 cells were examined with MTS cytotoxicity assay.The circular dichroism spectrum results showed the secondary structure of Temporin-Lb was PPⅡ, and the secondary structure of Catesbeianin-1a was random coil.Using MTS cytotoxicity assay, it was found that given Catesbeianin-1a, the sharp of the three cancer cells above had little changed after culturing for 24 h, and the three cancer cells promoted normal.Given Temporin-Lb, the cell morphology of three cancer cells had changed after culturing for 24 h, the growth of the three cancer cells above had been inhibited, especially the bioactive peptide Temporin-Lb had a sharp antitumor effect to mice leukemia K562 cells between the concentration of 4 and 40 μmol/L.Bioactive peptide Catesbeianin-1a had no obvious effect on proliferation of the three cancer cells above.Bioactive peptide Temporin-Lb had a certain inhibitory effect to tumor cells. 相似文献
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H. M. S. Davies 《Equine veterinary journal》2009,41(3):225-228
Reasons for performing study: Data are required to confirm that strain gauges recording high bone strains in Thoroughbred racehorses provide an accurate record of bone strain. Objective: To test the accuracy and reliability of very high in vivo strain recordings made during fast exercise in Thoroughbred racehorses. Methods: Strains were recorded during exercise from rosette gauges implanted onto the mid‐shaft dorsal cortex of each third metacarpal bone (MC3) in 6 yearling and 6 mature Thoroughbreds in a previous experiment. Bulk elastic modulus (EUS) was calculated from ultrasound speed and single photon absorptiometry measures. Each cleaned MC3 with the original gauge in situ and new gauges placed in a region of strain similarity (as shown by photoelastic coating) was loaded in a materials testing system (MTS) and strains recorded during loading. Elastic moduli were calculated from strain measures from new rosette gauges on the medial, dorsal, lateral and palmar surfaces (Em; Ed; El; Ep), and bulk moduli calculated from the displacement of the MTS machine heads during loading (Ebt). Peak loads were increased incrementally to failure. Results: Of 14 original gauges tested against new gauges, 11 recorded strains from 80–115% of the new gauges and 3 showed reduced function (31–40%). Ebt were similar to Em, and EUS were similar to El and not significantly different from Ed. Maximum strains at yield were recorded by the medial gauges and ranged from ?7500 to ?16,000 μ?. Conclusions and clinical relevance: Similarities between recordings from gauges used in vivo and new gauges confirmed the reliability and likely accuracy (or possible underestimate) of very high strains (exceeding ?6000 μ?) recorded in exercising Thoroughbred racehorses. The similarity between Ebt and Emconfirms that the gauges measured the true distortion of the bone in the MTS. These results confirm that mammalian bone may withstand much greater compressive loads than ?4000 μ? under some conditions at least. 相似文献
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Samiran Bandyopadhyay Goutam Mandal Piu Saha Mihir Sarkar 《Research in veterinary science》2009,87(1):85-90
In Arunachal Pradesh and other sub-Himalayan areas of India, accidental consumption of Senecio plants by yaks is often fatal as the plant contains toxic alkaloids like Seneciophylline. The present investigation was undertaken to demonstrate the pro-oxidant effects of an ethanolic extract of Seneciochrysanthemoides (S-EtOH). S-EtOH impaired viability in macrophages, the IC50 being 13.8 ± 1.11 μg/mL. The effect of S-EtOH (1 μg/mL) on generation of reactive oxygen species (ROS) in macrophages was measured by flow cytometry using 2′,7′-dichlorofluorescein diacetate (H2DCFDA) where it caused a significant increase in the mean fluorescence channel (MFC) from 8.55 ± 0.03 to 47.32 ± 2.25 (p < 0.001). S-EtOH also effected a 3.8-fold increase in extracellular nitric oxide (NO) generation from 4.90 ± 0.72 μM to 18.79 ± 0.32 μM (p < 0.001), a 2.2-fold increase in intracellular NO production, the MFC increasing from 14.95 ± 0.48 to 33.34 ± 1.66 (p < 0.001), and concomitantly depleted non protein thiols as analyzed by flow cytometry using mercury orange, with a reduction in MFC from 632.5 ± 49.44 to 407.4 ± 12.61 (p < 0.01). Additionally, S-EtOH (14 μg/mL, 24 h) caused apoptosis as evident by increased Annexin V binding and terminal deoxynucleotidyl transferase mediated dUTP DNA nick end labeling. Taken together, the cytotoxicity of S-EtOH can be partly attributed to its capacity to inflict oxidative damage via generation of both reactive oxygen and nitrogen species culminating in apoptosis. 相似文献
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以人肝实质细胞癌（hepatocellular carcinoma,HCC）细胞SMCC-7721为研究对象,比较了在磁控加载环境中细胞增殖的3种测定方法。结果表明,由于微球的干扰,台盼蓝法在此环境下的测定容易出现错误统计,同时需时较长。MTT法由于显色物质为非水溶性,在有机溶剂中的再次溶解的均匀度不好掌握,测定结果偏差较大,且容易因溶解过程造成微球漂浮而导致取样点失效。而MTS法在保持测定结果与传统的台盼蓝法无显著差异的前提下,却更为简单快速,特别是能够避免微球对于测定的多种干扰,因此对研究这种加载环境中的细胞增殖,是一种最为适用的方法。 相似文献
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A quantitative and reproducible 96‐well microtiter method that is easily adaptable for the screening of Saprolegnia biofilm inhibitors is described. As opposed to other methods previously developed for the screening of Saprolegnia inhibitors on spore germination or mycelial growth, this technique is of particular significance as it investigates potential inhibitors against surface‐attached mycelial mats of Saprolegnia spp. (biofilm). In this study, we have investigated the effects of propionic acid (PPA) on reducing the viability of induced Saprolegnia biofilms using colorimetric MTS assay based on the reduction of tetrazolium salts. Viability of Saprolegnia hyphae in treated biofilms was reduced significantly following treatment with different PPA concentrations. The effect was enhanced after combining each of the tested PPA concentrations with 500 mg/L of boric acid (BA). However, the percentage of non‐viable hyphae was still higher in 200 mg L–1 bronopol‐treated biofilms (positive control) following 6‐ and 12‐hr exposure. Similar results were observed using other recently described fluorescence‐based assays for viability. 相似文献
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本研究旨在克隆猪细胞周期蛋白A基因(CyclinA),并在猪脐静脉血管内皮细胞(SUVEC)中表达,以验证其功能。以人的CyclinA基因为信息探针,经电子克隆得到猪CyclinA基因,通过RT-PCR和DNA测序验证电子克隆结果并对其作生物信息学分析,用RT-PCR、Westernblot研究它在SUVEC中的表达情况。应用激光共聚焦显微镜分析它在细胞中的亚细胞定位,并通过流式细胞仪分析细胞周期以及用MTS法测定细胞的增殖能力。结果如下:核酸测序证明RT-PCR产物同电子克隆结果相符。该cDNA包含1299bp的完整开放阅读框(ORF),共编码432个氨基酸,经NCBIBLAST分析,该基因定位于猪的8号染色体上。Westernblot结果显示CyclinA基因编码蛋白的相对分子质量大小约为40ku,亚细胞定位研究表明该蛋白定位于细胞核中。经流式细胞仪分析表明稳定表达该基因的细胞,其G1期的细胞数量比对照组细胞增加了15%～20%,而S期的细胞数量比对照组细胞减少了约18%;MTS法检测显示细胞株SUVEC-CycAGFP的增殖活性明显高于对照组细胞。作者成功克隆到新基因猪源细胞周期蛋白A,并验证了其生物学功能,为今后开展病毒感染对猪细胞周期蛋白A影响的研究奠定了基础。 相似文献
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试验旨在研究新发现的两种牛蛙活性肽对人肺癌细胞NCI-H446、人乳腺癌细胞MCF-7及小鼠白血病细胞K562 3种肿瘤细胞体外增殖的影响,为新的多肽抗肿瘤药筛选提供依据。本试验利用圆二色谱(CD)法检测两种新牛蛙活性肽的二级结构,通过MTS细胞毒试验测定不同浓度的两种新牛蛙活性肽对人肺癌细胞NCI-H446、人乳腺癌细胞MCF-7及小鼠白血病细胞K562 3种瘤细胞体外增殖的影响。圆二色谱法结果显示,Temporin-Lb的二级空间结构为聚脯氨酸Ⅱ型螺旋(PPⅡ)结构,Catesbeianin-1a的二级空间结构为无规则卷曲。MTS细胞毒试验结果显示,给予Catesbeianin-1a的3种瘤细胞培养24 h后,瘤细胞形态无明显变化,正常增殖,而给予Temporin-Lb的3种瘤细胞培养24 h后,瘤细胞发生皱缩、细胞变圆、脱落甚至死亡,增殖受到抑制,其中对Temporin-Lb在4~40 μmol/L浓度范围内对小鼠白血病细胞K562的抑制效果最为明显。结果表明,新牛蛙活性肽Temporin-Lb具有一定的抑瘤作用,Catesbeianin-1a对瘤细胞的体外增殖没有明显影响。 相似文献
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[目的]MTT法与MTS法线性关系比较与热应激模型筛选.[方法]以IEC-6及SF9细胞为研究对象,取对数生长期细胞,设置4个接种浓度,将两种细胞制成对应浓度细胞悬液接种于96孔板24 h,分别加入两种试剂后在490 nm处读取OD值.根据OD值确定两种细胞最佳接种浓度.并根据OD值比较两种检测细胞活力方法哪种更加适合于动物贴壁细胞IEC-6细胞活力测定.取最适浓度的IEC-6细胞加入MTS后孵育1.5、2.5、3.5h三个不同时间点检测OD值,根据OD值确定最佳孵育时间.将IEC-6细胞在最佳接种浓度下接种于96孔板24 h,分别在43、41、39℃下采用不同热应激时间4、8、12、24 h,测定OD值,根据OD值确定IEC-6细胞热应激模型.[结果]MTS法在动物贴壁细胞IEC-6及植物半贴壁细胞SF9中检测的准确度度高,灵敏度好,是比MTT法更优的检测贴壁细胞增殖活性的方法.IEC-6细胞最佳接种浓度为4.1×104/mL至5.5×104/mL,SF9细胞最佳接种浓度为3.28×105/mL至4.4×105/mL.MTS最佳孵育时间为3.5h,并确定大鼠空肠上皮细胞热应激模型为43℃,6h.[结论]检测贴壁不牢的细胞活力时MTS法优于MTT法,并成功建立IEC-6细胞热应激模型. 相似文献