丰城鸡血藤H-103树脂提纯物抗MCF-7和A549的作用

目的评价丰城鸡血藤H-103树脂提纯物体外对人乳腺癌MCF-7细胞株和人肺腺癌A549细胞株抗肿瘤作用。方法采用MTT法检测不同浓度丰城鸡血藤H-103树脂提纯物对人乳腺癌MC-7细胞株和人肺腺癌A549细胞株生长的影响。结果2mg／ml丰城鸡血藤H-103树脂提纯物作用48h后，对两种肿瘤细胞的最大抑制率都大于50％，并且其抗瘤作用随着时间和剂量的增加而增强。结论丰城鸡血藤H-103树脂提纯物对MCF-7和A549在体外具有显著抑制作用。     

鸡血藤不同成分抗AA诱导的血小板聚集作用的实验研究

目的筛选由花生四烯酸(AA)诱导的鸡血藤抗血小板聚集作用的有效成分。方法采用水提醇沉法,得鸡血藤浸膏(总成分),用AB-8大孔吸附树脂提取其中的总黄酮成分,提取黄酮后剩下的滤液即为非黄酮成分。实验分组:分为鸡血藤浸膏组、总黄酮成分组、非黄酮成分组、阿司匹林对照组、生理盐水对照组。分别给SD大鼠灌胃高、中、低不同剂量的鸡血藤各组分。测定由AA诱导的血小板5min之内的最大聚集率。结果鸡血藤浸膏高、中、低剂量各组的聚集率(%)分别为:4.6±1.1、8.3±2.0、42.5±4.2;鸡血藤总黄酮成分高、中、低剂量各组的聚集率(%)分别为:6.4±1.5、37.6±3.5、70.1±4.3;鸡血藤非黄酮成分高、中、低剂量各组的聚集率(%)分别为:65.7±3.2、69.0±3.8、72.5±4.4;阿司匹林对照组的聚集率(%)为:41.6±3.8;正常对照组的聚集率(%)为:70.3±4.6。鸡血藤浸膏组、鸡血藤总黄酮成分组(低剂量组除外)、阿司匹林组分别显著性低于正常对照组(P0.01)。鸡血藤非黄酮成分高、中、低剂量各组与生理盐水对照组比较,结果无显著性差异(P0.05)。结论鸡血藤总黄酮具有显著性的抗AA诱导的血小板聚集作用,为开发新的抗血小板聚集药物打下基础。     

鸡血藤活性成分SS8对骨髓抑制小鼠造血祖细胞增殖的作用

背景机体造血调控的关键在于造血干细胞和造血祖细胞,被抑制的造血干/祖细胞的增殖、分化、成熟和释放中的任何一个环节的增强,都可以促进机体造血功能的恢复.目的分析鸡血藤活性成分SS8对骨髓抑制小鼠粒单系造血祖细胞、红系造血祖细胞、巨核系造血祖细胞增殖的影响.设计随机对照实验.单位中国人民解放军总医院临床药理研究室.材料实验于2002-02/2002-06在解放军总医院药理研究室完成.选取健康昆明种小鼠20只,随机分为正常组、对照组、SS8高剂量组、SS8中剂量组、SS8低剂量,4只/组.方法除正常组外,其余各组小鼠均以60Coγ射线全身亚致死量辐射(照射率210.6 Rnt/min,照射剂量400cGy/min,照射时间110.7s),于照射后当天正常组和对照组腹腔注射无菌注射用水,SS8高、中、低剂量组分别腹腔注射0.4,0.08,0.016 g/L鸡血藤活性成分SS8,1次/d,连续给药21 d.给药后第3,7,14,21天时分别行颈椎脱位法处死小鼠,收集股骨骨髓造血祖细胞,采用甲基纤维素半固体培养法,对长期接受SS8治疗后的骨髓抑制小鼠的造血祖细胞进行体外培养.主要观察指标各组粒单系造血祖细胞、红系造血祖细胞、各组爆式红系造血祖细胞、各组爆式红系造血祖细胞的集落生长情况.结果实验纳入20只小鼠全部进入结果分析.①各组粒单系造血祖细胞集落生长情况给药后3 d,正常组粒单系造血祖细胞集落数为(180.67±5.03)个,SS8高、中、低剂量组与对照组基本相似[(0.75±0.96),(1.75±0.50),(1.75±0.96),(1.75±0.96)个;t=1.847 7,P=0.114 1;t=1.473 1,P=0.191 1;t=1.473 1,P=0.1911];给药后21 d,SS8低剂量组与对照组基本持平[(43.60±2.07),(47.00±3.92)个;t=1.534 0,P=0.175 9],SS8中、高剂量组均明显高于对照组[(90.60±3.36),(93.00±3.16),(47.00±3.92)个;t=16.889 6,P＜0.05;t=18.2718,P＜0.05].②各组红系造血祖细胞集落生长情况给药后3 d,对照组和SS8高、中、低剂量组与正常组比较,红系造血祖细胞数目明显降低;至给药后7 d,各组均开始恢复;给药后21 d,SS8低剂量组与对照组基本相似[(44.50±1.29),(42.67±7.23)个;t=0.511 9,P=0.630 5],SS8中、高剂量组均明显高于对照组[(62.50±2.08),(93.25±3.10),(42.67±7.23)个,t=5.355 3,P＜0.05;t=12.822 3,P＜0.05].③各组爆式红系造血祖细胞集落生长情况给药后3 d,对照组和SS8高、中、低剂量组爆式红系造血祖细胞均降至最低,分别为(1.00±1.00),(7.00±1.00),(6.00±2.00),(6.00±2.00)个,但SS8高、中、低剂量组仍高于对照组(P均＜0.05);给药后21 d,SS8低剂量组仍与对照组相似[(5.00±1.82),(3.00±0.82)个;t=2.003 8,P=0.091 9],SS8中、高剂量组均明显高于对照组[(15.25±2.50),(16.25±1.71),(3.00±0.82)个;t=9.311 9,P＜0.05;t=13.973 5,P＜0.01].④各组巨核系造血祖细胞集落生长情况给药后3 d,由于照射后小鼠骨髓造血祖细胞的增殖能力明显受损,SS8高、中、低剂量组及对照组巨核系造血祖细胞数目较正常组显著降低,但SS8高、中、低剂量组仍高于对照组[(2.67±0.58),(1.33±0.58),(1.33±0.58),(0.33±0.58)个],且SS8高剂量组与对照组比较有显著性差异(t=4.941 2,P=0.007 8);给药后21 d,SS8高、中、低剂量组均明显高于对照组[(2.50±0.58),(2.00±0.32),(1.50±0.58),(1.00±0.52)个;t=3.851 2,P=0.008 4;t=0.975 3.P=0.361 7;t=1.283 7,P=0.246 6].结论鸡血藤活性成分SS8低剂量对骨髓抑制小鼠造血祖细胞的增殖无显著刺激作用,而中、高剂量均可显著升高骨髓抑制后粒单系造血祖细胞、红系造血祖细胞、巨核系造血祖细胞集落产率,且随时间的延长刺激作用逐渐加强,且高剂量的刺激作用明显优于中剂量.提示造血祖细胞的增生是机体造血的重要环节,鸡血藤活性成分SS8对骨髓抑制小鼠造血祖细胞的增殖有明显刺激作用.     

曲古抑菌素A抑制乳腺癌MCF-7细胞增殖和诱导其凋亡的作用

目的：研究组蛋白去乙酰化酶抑制剂曲古抑菌素A对乳腺癌MCF-7细胞的增殖抑制作用和诱导凋亡作用。方法：乳腺癌MCF-7细胞经不同剂量曲古抑菌素作用后,用二甲氧唑黄比色法（XTT）法测定曲古抑菌素A对乳腺癌MCF-7细胞的增殖抑制率;用免疫细胞化学染色法观察其对凋亡相关基因p21wafl表达的影响。结果：不同浓度的曲古抑菌素均可抑制MCF-7细胞的增殖,且抑制率具有剂量和时间依赖性;凋亡相关基因p21wafl在曲古押菌素A作用细胞中的表达明显高于未进行处理的细胞。结论：曲古押菌素可抑制体外培养的人乳腺癌（MCF-7）细胞生长,诱导癌细胞发生凋亡。     

油菜花粉脂溶性提取物对人肺腺癌细胞A549杀伤作用的实验研究

目的:探讨油菜花粉脂溶性提取物(BPE)对体外培养的人肺腺癌细胞A549的杀伤效应.方法:以人肺腺癌细胞A549为研究对象,电镜观察用药前后A549细胞形态,应用CCK-8法检测BPE对A549细胞增殖的影响,用流式细胞术检测BPE对A549细胞周期和凋亡的影响.RT-PCR检测bax/bcl-2基因表达.结果:BPE对A549细胞增殖有抑制作用,在一定浓度范围内,呈量一效关系,当BPE浓度为1 000 μg/mL时,A549细胞增殖的抑制率达到最高,为76.54%.透射电镜下可见细胞核固缩,染色质凝集或边聚,胞浆内出现空泡,并有凋亡小体出现.流式细胞仪检测结果显示A549细胞周期比例分布出现变化,G0/G1期细胞比例呈下降趋势,而S期和G2-M期比例则上升;随着时间的延长,细胞凋亡率上升.RT-PCR检测显示BPE的作用效应不是通过bax/bcl-2基因实现的.结论:BPE可抑制人肺腺癌细胞A549的增殖,诱导细胞的凋亡.     

薏苡仁油抗恶性肿瘤作用的研究进展

近年,恶性肿瘤发病率上升迅速,发病人群具有年轻化的趋势,其主要治疗方法为放、化疗、靶向治疗,常伴有一些不良反应,影响患者的生存质量。因此,中药的开发利用在恶性肿瘤的治疗上受到越来越多的重视。目前,一些基础和临床研究发现,中药薏苡仁油可联合手术、放化疗和靶向治疗用于肺癌、肝癌和乳腺癌等的治疗,具有抗恶性肿瘤增殖、减轻患者不良反应和提高免疫力的作用。     

FTY720对体外培养MCF-7细胞增殖及凋亡影响的研究

目的探讨FTY720对体外培养MCF-7细胞增殖及凋亡的影响。方法体外培养MCF-7细胞,将其培养液中加入不同浓度的FTY720,继续培养48小时,MTT法检测MCF-7细胞的增殖情况;瑞士-姬姆萨染色观察细胞形态变化;流式细胞仪检测FTY720对MCF-7细胞的细胞周期、凋亡率的影响。结果当FTY720浓度为6 400 ng/ml时,体外培养MCF-7细胞的增殖受到明显抑制,抑制率为62.0%（P〈0.05）,而且抑制率呈浓度依赖性;镜下可见细胞出现凋亡的形态;流式细胞仪检测分析显示FTY720可将MCF-7细胞阻滞于G1期,并促进其发生凋亡,凋亡率呈浓度依赖性。结论在体外培养的MCF-7细胞培养液中加入一定浓度的FTY720,能明显抑制该细胞的增殖,调节该细胞周期并诱导其凋亡。     

铁螯合剂的抗白血病作用研究进展

铁是细胞生长繁殖的必需元素,它在能量代谢、DNA合成以及对调控细胞周期性进程的因子均有重要作用.大量体内、外试验证实铁螯合剂具有潜在的抗肿瘤作用,铁剥夺(iron deprivation)可抑制多种肿瘤细胞增殖并诱导凋亡,有望成为一种治疗肿瘤的新策略.本文将对其在白血病中的研究进展作一综述.     

miR-103a-3p对肺癌A549细胞增殖、迁移和侵袭的影响

摘要：目的〓探讨miR-103a-3p在人肺癌组织中的表达及对肺癌A549细胞增殖、迁移和侵袭的影响。 方法：收集南通市肿瘤医院52例肺癌患者手术组织标本,qRT-PCR检测肺癌组织及癌旁组织中miR-103a-3p的表达;采用Lipofecta mineTM 3000 将miR-103a-3p mimic、mimic NC、miR-103a-3p inhibitor及inhibitor NC转染至A549细胞中,qRT-PCR检测miR-103a-3p的转染效率;CCK8实验检测其细胞增殖能力;流式细胞术检测其细胞凋亡能力;划痕愈合实验检测细胞的迁移能力;Transwell小室实验检测细胞的侵袭能力。 结果：miR-103a-3p在肺癌组织中的表达水平明显低于癌旁组织（p＜0.01）;qRT-PCR结果显示,转染miR-103a-3p mimic组细胞中miR-103a-3p的表达水平明显高于mimic NC组,且细胞增殖、迁移和侵袭能力受到抑制;而转染miR-103a-3p inhibitor 组细胞中miR-103a-3p的表达水平低于inhibitor NC组,且细胞增殖、迁移和侵袭能力增强;但细胞凋亡在4组中变化均不明显。 结论：miR-103a-3p在肺癌组织中低表达,miR-103a-3p能够抑制肺癌A549细胞的增殖、迁移和侵袭。     

miR-103a-3p对肺癌A549细胞增殖、迁移和侵袭的影响

目的探讨mi R-103a-3p在人肺癌组织中的表达及对肺癌A549细胞增殖、迁移和侵袭的影响。方法收集南通市肿瘤医院52例肺癌患者手术组织标本,q RT-PCR检测肺癌组织及癌旁组织中mi R-103a-3p的表达;采用Lipofecta mineTM3000将mi R-103a-3p mimic、mimic NC、mi R-103a-3p inhibitor及inhibitor NC转染至A549细胞中,q RT-PCR检测mi R-103a-3p的转染效率;CCK8实验检测其细胞增殖能力;流式细胞术检测其细胞凋亡能力;划痕愈合实验检测细胞的迁移能力;Transwell小室实验检测细胞的侵袭能力。结果 mi R-103a-3p在肺癌组织中的表达水平明显低于癌旁组织(P0.01);q RT-PCR结果显示,转染mi R-103a-3p mimic组细胞中mi R-103a-3p的表达水平明显高于mimic NC组,且细胞增殖、迁移和侵袭能力受到抑制;而转染mi R-103a-3p inhibitor组细胞中mi R-103a-3p的表达水平低于inhibitor NC组,且细胞增殖、迁移和侵袭能力增强;但细胞凋亡在4组中变化均不明显。结论 mi R-103a-3p在肺癌组织中低表达,mi R-103a-3p能够抑制肺癌A549细胞的增殖、迁移和侵袭。     

The defensin from avocado (Persea americana var. drymifolia) PaDef induces apoptosis in the human breast cancer cell line MCF-7

Antimicrobial peptides (AMPs) are cytotoxic to cancer cells; however, mainly the effects of AMPs from animals have been evaluated. In this work, we assessed the cytotoxicity of PaDef defensin from avocado (Persea americana var. drymifolia) on the MCF-7 cancer cell line (a breast cancer cell line) and evaluated its mechanism of action. PaDef inhibited the viability of MCF-7 cells in a concentration-dependent manner, with an IC₅₀ = 141.62 μg/ml. The viability of normal peripheral blood mononuclear cells was unaffected by this AMP. Additionally, PaDef induced apoptosis in MCF-7 cells in a time-dependent manner, but did not affect the membrane potential or calcium flow. In addition, PaDef IC₅₀ induced the expression of cytochrome c, Apaf-1, and the caspase 7 and 9 genes. Likewise, this defensin induced the loss of mitochondrial Δψm and increased the phosphorylation of MAPK p38, which may lead to MCF-7 apoptosis by the intrinsic pathway. This is the first report of an avocado defensin inducing intrinsic apoptosis in cancer cells, which suggests that it could be a potential therapeutic molecule in the treatment of cancer.     

The farnesyltransferase inhibitor R115777 (tipifarnib) in combination with tamoxifen acts synergistically to inhibit MCF-7 breast cancer cell proliferation and cell cycle progression in vitro and in vivo

Cross-talk between receptor tyrosine kinases and estrogen receptor is at least partly responsible for the development of acquired resistance to endocrine therapies. Hence, targeting receptor tyrosine kinases and their downstream partners with inhibitors/antagonists may reverse this resistance. Although ras mutations are rare in breast cancer (2%), aberrant function of Ras signal transduction pathways is common. We therefore investigated the efficacy of the farnesyltransferase inhibitor (FTI) R115777 (tipifarnib) in combination with tamoxifen in MCF-7 human breast cancer models both in vitro and in vivo. There was a synergistic antiproliferative interaction between R115777 and 4-hydroxy-tamoxifen in vitro as calculated by median effect analysis. The combination resulted in a significantly greater G(1) arrest than either drug alone and this was associated with marked inhibition of cyclin D1 and induction of the cell cycle inhibitor p27(kip1). Combining R115777 with either tamoxifen or estrogen withdrawal in vivo produced a significantly greater inhibition of tumor growth and lower xenograft cell proliferation than either therapy alone. These results suggest that the combination of this FTI with endocrine therapy may be of therapeutic benefit in the treatment of breast cancer. Enhanced G1 arrest due to modulation of cell cycle regulatory proteins may be the underlying mechanism for the positive interaction between FTIs and tamoxifen.     

The role of captopril and losartan in prevention and regression of tamoxifen-induced resistance of breast cancer cell line MCF-7: An in vitro study

Innate and acquired tamoxifen (TAM) resistance in estrogen receptor positive (ER+) breast cancer is an important problem in adjuvant endocrine therapy. The underlying mechanisms of TAM resistance is yet unknown. In the present study, we evaluated the role of renin–angiotensin system (RAS) in the acquisition of TAM resistance in human breast cancer cell line MCF-7, and the potential role of captopril and captopril + losartan combination in the prevention and reversion of the TAM resistant phenotype. MCF-7 cells were continuously exposed to 1 μmol/L TAM to develop TAM resistant cells (TAM-R). MTT cell viability assay was used to determine the growth response of MCF-7 and TAM-R cells, and quantitative real-time polymerase chain reaction (qRT-PCR) was used to assess angiotensin I converting enzyme (ACE), angiotensin II receptor type-1 and type-2 (AGTR1 and AGTR2) mRNA expressions. Preventive and therapeutic effects of RAS blockers – captopril and losartan – were examined on MCF-7 and TAM-R cells. Based on qRT-PCR, TAM-R cells compared to MCF-7 cells, had a mean ± SD fold increase of 319.1 ± 204.1 (P = 0.002) in production of ACE mRNA level, 2211.8 ± 777.9 (P = 0.002) in AGTR1 mRNA level, and 265.9 ± 143.9 (P = 0.037) in production of AGTR2 mRNA level. The combination of either captopril or captopril + losartan with TAM led to the prevention and even reversion of TAM resistant phenotype.     

替吉奥对人肺癌细胞A549及胃癌细胞SGC-7901的体外抑制作用

目的研究替吉奥对人肺癌细胞A549及胃癌细胞SGC-7901的体外抑制作用。方法采用四甲基偶氮唑盐（MTT）测定不同浓度的替吉奥对A549细胞及SGC-7901细胞的抑制作用,并选择5-氟尿嘧啶（5-Fu）作对比,计算半数抑制浓度（IC50）。运用流式细胞仪观察替吉奥对A549及SGC-7901细胞周期和凋亡的影响。结果替吉奥对2种细胞的抑制作用随浓度的增加而增加,呈明显浓度依赖性。替吉奥对3．549细胞及SGC-7901细胞的IC50分别为78．33μg／mL和63．40μg／mL,明显低于5-Fu的241．60μg／mL和201．68μg／mL。替吉奥能明显使2种细胞的细胞周期被阻滞于G0／G1及S期,且对A549细胞及SGC-7901细胞的凋亡率分别为（36．64±3．92）％和（38．69±3．02）％,明显高于空白组。结论替吉奥对人肺癌细胞A549及胃癌细胞SGC-7901的体外抑制作用明显,显著优于5-Fu。     

下调人乳腺癌MCF-7细胞系miRNA-221和miRNA-222表达对抑制肿瘤细胞增殖及迁移能力的探讨

目的通过敲低微小RNA(microRNA,miRNA)-221和miRNA-222的表达上调组织金属蛋白酶抑制剂3(TIMP3)的方法来研究人乳腺癌MCF-7细胞系的增殖和迁移能力。方法根据miRBase数据库中Homo sapiens(hsa)-miRNA-221和hsa-miRNA-222的寡核苷酸序列和一段无义序列分别设计并重组成质粒:反义抑制miRNA-221(antisense-miRNA-221,AS-miRNA-221)、反义抑制miRNA-222(antisense-miRNA-222,AS-miRNA-222)、共同反义抑制miRNA-221/222(antisense-miRNA-221/222,AS-miRNA-221/222)和无义抑制(Scramble),并将其分别利用脂质体LipofectamineTM2000转染进人乳腺癌MCF-7细胞中,经G418筛选后建立稳定表达的对照细胞株[未转染正常细胞(Control组)和无义抑制细胞(Scramble组)]和低表达miRNA-221、miRNA-222细胞株(即ASmiRNA-221组、AS-miRNA-222组和AS-miRNA-221/222组)。转染24 h后于荧光显微镜下观察转染效率;采用实时荧光定量聚合酶链反应(PCR)检测各组细胞中miRNA-221和miRNA-222的表达量,采用逆转录PCR检测各组细胞中质粒载体上携带的抗性neo基因的表达情况,以此来验证转染是否成功;分别采用实时荧光定量PCR、免疫印迹法检测TIMP3和金属蛋白酶17(ADAM17)的表达差异;采用细胞计数试剂盒(CCK-8)检测并绘制生长曲线,观察低表达miRNA-221、miRNA-222各组细胞的生长能力;采用划痕修复实验观察转染后细胞的迁移能力。结果转染24 h之后,在荧光显微镜下观察到各转染组细胞的绿色荧光蛋白表达较多,即转染效率较高。检测转染后各组细胞中neo基因、miRNA-221和miRNA-222的表达。与Control组比较,Scramble组、ASmiRNA-221组、AS-miRNA-222组、AS-miRNA-221/222组neo基因表达明显升高;与Scramble组比较,AS-miRNA-221组、AS-miRNA-222组、AS-miRNA-221/222组miRNA-221和miRNA-222的表达量明显降低,即证实转染了反义抑制miRNA-221/222的低表达稳定细胞株构建成功。与Scramble组比较,AS-miRNA-221组、AS-miRNA-222组、AS-miRNA-221/222组细胞TIMP3 mRNA表达升高,而其调控的ADAM17水平降低。生长曲线显示低表达miRNA-221、miRNA-222各组细胞的生长能力明显受到抑制。划痕修复实验结果显示低表达miRNA-221、miRNA-222各组细胞的迁移能力降低。结论通过敲低miRNA-221、miRNA-222、上调TIMP3表达可以抑制人乳腺癌细胞系MCF-7的增殖和迁移能力。     

The reduction of l-cystine to l-cysteine in the supernatant of A549 cell culture causes imipenem inactivation

In the course of measuring the intracellular antibacterial activity of antibiotics using a human alveolar epithelial cell line A549, we discovered that the antimicrobial activity of several carbapenems (CPs) decreased in the supernatant of the cells cultured with fetal calf serum (FCS)-free RPMI1640 medium (RPMI). Further investigation revealed A549 culture supernatant inhibited the antibacterial activity of CPs but did not inactivate other types of antibiotics. CE-TOFMS and LC-TOFMS metabolomics analysis of the supernatant revealed the presence of l-cysteine (Cys), which is not an original component in RPMI. Cys is known to hydrolyze and inactivate CPs in a time- and concentration-dependent manner. In this study, the inactivating effects of A549 culture supernatant on the imipenem (IPM) were examined. Antimicrobial activity of 100 μg/mL IPM decreased to 25% with two-fold dilution of A549 supernatant incubated for 3 h. l-Cystine (CS), the Cys oxide, and an original component in RPMI did not inactivate IPM. However, the inactivating effects of A549 supernatant on IPM corresponds with the Cys concentration and depends on the CS content of the culture medium. Addition of FCS to the culture medium decreased the Cys concentration and reduced inactivation of IPM in a dose-dependent manner. Our data suggest that IPM were inactivated by Cys reduced from CS, and this CS-to-Cys conversion must be considered when evaluating the antimicrobial activity of CPs in cell culture. Further studies are needed to understand if the same inactivation occurs around the cells in the human body.     

高压氧对槲皮素逆转肺腺癌A549/DDP细胞耐药的影响及其机制

目的探讨高压氧环境下槲皮素在体外对肺腺癌A549/DDP细胞株耐药的逆转及其对P-gp和survivin蛋白表达的影响。方法 MTT法测定槲皮素在高压氧环境下对A549/DDP细胞耐药的逆转作用;流式细胞法(FCM)检测高压氧环境下A549/DDP细胞P-gp和survivin蛋白的表达。结果槲皮素在高压氧环境下使DDP对A549/DDP细胞的半抑制浓度(IC50)从(31.34±2.99)μg/ml下降至(7.56±0.87)μg/ml,其逆转倍数为4.15;高压氧处理A549/DDP细胞对P-gp的表达无显著影响(P>0.05),处理组AFI值为4.22±0.11,对照组AFI值为4.42±0.03;但能够显著降低survivin蛋白的表达(P<0.05),处理组AFI值为2.52±0.11,对照组AFI值为3.96±0.13。结论高压氧能增强槲皮素对肺腺癌A549/DDP细胞MDR的逆转作用;其增强作用可能通过降低survivin蛋白的表达实现。     

The effect of human organ preservation and albumin flush solution on in vitro cell metabolic activity.

In liver transplantation, the organ during the recipient's operation is traditionally flushed with 4.5% of human albumin solution to wash away the potassium-rich University of Wisconsin (UW) solution. It has been argued whether albumin could be useful at this stage. We used a new simple non-toxic assay to determine cell viability in vitro. Alamar Blue incorporates a redox indicator which changes colour from blue (oxidised form) to magenta (reduced form) in response to metabolic activity. Cultured human hepatocyte and HUVEC cell lines were exposed for 3, 6, 12 or 24 hours to plain medium, UW solution, human albumin 4.5% solution, UW-containing effluents before and after preservation as well as albumin flushes from different transplantation cases. After addition of Alamar Blue the optical density was measured at 570 nm and the background measured at 600 nm was subtracted. The studies showed a significantly lower metabolic rate of the cells exposed to albumin and albumin-containing flushes at all time periods, even after a short exposure such as 3 hours (p < 0.001). On the other hand, there was no significant difference of growth and metabolic activity rate between cells exposed to UW solution, different UW-containing flushes and medium for up to 12 hours. In conclusion, human albumin is a very poor solution for cell maintenance. In contrast, UW solution has comparable results with the full growth medium for up to 12 hours of exposure.