苦参碱通过TLR3下调PI3K/Akt通路抑制子宫肌瘤细胞的增殖、侵袭和迁移北大核心CSCD

目的:探讨苦参碱抑制子宫肌瘤细胞凋亡、侵袭和迁移的机制。方法:将子宫肌瘤细胞分为对照组(不做任何处理)、苦参碱低、中、高剂量组(分别用0.5、1.0、2.0 mg/ml的苦参碱处理)、pcDNA3.1/TLR3质粒(TLR3)+高剂量苦参碱组(2.0 mg/ml苦参碱处理)、NC组(转染空质粒+2.0 mg/ml苦参碱处理)。RT-qPCR检测各组细胞TLR3、PI3K mRNA表达;CCK-8法检测各组细胞存活率;流式细胞术检测细胞凋亡;划痕实验检测各组细胞迁移;Transwell检测各组细胞侵袭能力;Western blot检测各组细胞TLR3、PI3K、p-Akt、MMP-2、MMP-9蛋白表达。结果:与对照组相比,苦参碱低、中、高剂量组TLR3 mRNA、PI3K mRNA、TLR3、PI3K、p-Akt、MMP-2、MMP-9表达及细胞增殖、迁移和侵袭能力降低,凋亡率升高,差异有统计学意义(P<0.05);与苦参碱高剂量组相比,TLR3+苦参碱高剂量组TLR3 mRNA、PI3K mRNA、TLR3、PI3K、p-Akt、MMP-2、MMP-9表达与细胞增殖、迁移和侵袭能力提高,细胞凋亡率降低,差异有统计学意义(P<0.05),TLR3-NC+苦参碱高剂量组与苦参碱高剂量组TLR3 mRNA、PI3K mRNA、TLR3、PI3K、p-Akt、MMP-2、MMP-9表达、细胞增殖、凋亡、迁移和侵袭能力差异无统计学意义(P>0.05)。结论:苦参碱通过下调TLR3表达下调P13K/Akt通路,抑制子宫肌瘤细胞增殖、侵袭和迁移。     

下调miR-21 抑制PI3K / AKT 信号通路对白血病细胞增殖凋亡的影响

目的:探讨miR-21 对白血病K562 细胞增殖凋亡的影响及对PI3K/ AKT 信号通路的调控作用。方法:将K562 细胞分为对照组、miR-21 NC 组和miR-21 干扰组,对照组不做处理,后两组采用阳离子脂质体LipofectamineTM2000 转染miR-21 inhibitor 和miR-21 negative control。转染48 h 后,利用实时荧光定量(qRT-PCR)检测各组细胞中miR-21 mRNA 的表达情况,采用MTT 比色法检测miR-21 对细胞增殖率的影响,流式细胞仪检测miR-21 对细胞周期和凋亡率的影响,蛋白质免疫印迹法(Western blot)检测miR-21 对各组细胞中PI3K/ AKT 信号通路相关蛋白PI3K、AKT 和p-AKT 表达的影响。结果:miR-21 干扰组中细胞的miR-21 mRNA 表达水平和细胞的存活率较对照组和miR-21 NC 组均明显降低;与对照组和miR-21 NC 组比较,流式细胞仪检测miR-3 干扰组中G0/ G1 期所占细胞比例明显升高,S 期细胞所占比例明显下降,细胞的凋亡率明显升高。Western blot 检测p-AKT 的表达水平较对照组和miR-21 NC 组明显下降,但PI3K 和AKT 蛋白的表达水平变化不大。结论:下调miR-21 能够抑制白血病K562 细胞的增殖,促进其凋亡,其作用机制可以与抑制PI3K/ AKT 信号通路有关。     

奥美拉唑治疗大鼠胃炎中PI3K/AKT通路的变化

目的探讨奥美拉唑对大鼠胃炎的治疗作用,以及其改善大鼠胃部损伤是否可以通过调节PI3K/AKT信号通路来实现。方法将60只成年雄性SD大鼠用幽门螺杆菌(Hp)构建胃炎,并随机分为对照组、胃炎组和治疗组,每组20只。胃炎构建1周后处死大鼠并收集胃部组织,HE染色法检测大鼠胃部炎症情况;凋亡蛋白Caspase 3表达活性使用试剂盒检测;使用Western blot法和Real-Time PCR法检测PI3K、AKT的基因和磷酸化蛋白的表达。结果与对照组相比,HE染色结果显示胃炎组和治疗组中胃组织中腺体减少,胃黏膜损伤,治疗组情况明显优于胃炎组。与对照组相比,胃炎组和治疗组Caspase 3活性明显升高(P<0.05),PI3K和AKT的磷酸化蛋白表达和mRNA表达差异有统计学意义(P<0.05);与胃炎组相比,治疗组中PI3K和AKT的磷酸化蛋白表达和mRNA表达显著升高,差异有统计学意义(P<0.05)。结论奥美拉唑可能有明显缓解大鼠胃炎的损伤作用,且可以通过调节PI3K/AKT信号通路来改善大鼠胃部损伤。     

肝细胞生长因子减轻皮质神经元的缺氧/复氧损伤

目的研究肝细胞生长因子(HGF)对缺氧/复氧诱导大鼠皮质神经元凋亡的保护。方法分离培养SD大鼠皮质神经元,经HGF(15、30和60μg/L)预处理后经缺氧/复氧诱导凋亡,用MTT比色法检测细胞存活率;用Hoechst33258染色法和流式细胞仪检测神经元的凋亡;用比色法检测细胞乳酸脱氢酶(LDH)和caspase-3活性变化。结果与正常对照组相比,缺氧/复氧组神经元的细胞存活率显著下降,细胞凋亡率和caspase-3活性升高(均P<0.05);而HGF预处理12 h可显著逆转缺氧/复氧所致的细胞存活率降低、凋亡率增加、LDH活性上升、caspase-3活性升高的改变(均P<0.05),且这些效应与HGF剂量正相关。此外,HGF的抗凋亡效应可被PI3K/Akt通路抑制剂LY294002阻断。结论HGF减轻缺氧/复氧所诱导的神经元凋亡可能与其激活神经元的PI3K/Akt信号通路、减少caspase-3表达有关。     

胡椒碱对卵巢癌细胞株SKOV-3侵袭与凋亡的影响及其机制

目的:观察胡椒碱对卵巢癌细胞株SKOV-3的侵袭与凋亡的影响并讨论其作用机制.方法:CCK-8法检测不同浓度的胡椒碱(0,5,10和20μmol/L)对SKOV-3细胞作用不同时间(12,24和36 h)后,SKOV-3细胞存活率的变化;Transwell小室法与TUNEL法分别检测SKOV-3细胞侵袭能力与凋亡能力的变化;Western印迹检测p-PI3K与p-Akt蛋白表达水平的变化.结果:CCK-8法结果显示胡椒碱随浓度增加与培养时间增长,对SKOV-3细胞存活率的抑制程度增强;采用10μmol/L胡椒碱培养SKOV-3细胞36 h后,SKOV-3细胞的细胞侵袭数明显降低,细胞凋亡数明显增加,差异有统计学意义(P<0.05);p-PI3K与p-Akt蛋白表达水平明显降低,差异有统计学意义(P<0.05).结论:胡椒碱能够抑制卵巢癌细胞SKOV-3的增殖与侵袭能力,其增加凋亡能力可能与抑制PI3K/Akt信号通路有关.     

PI3K/AKT/mTOR在姜黄素抑制食管癌细胞增殖中的作用

目的探讨PI3K/AKT/mTOR在姜黄素(Curcumin,Cur)抑制食管癌细胞(Ec-9706)增殖中的作用。方法食管癌Ec-9706细胞给予0、5、10和20μmol/L姜黄素培养24 h、48 h和72 h后,细胞计数CCK-8法检测食管癌Ec-9706细胞的存活率;流式细胞仪法检测Ec-9706细胞凋亡发生;Real-time法和Western blot法检测食管癌Ec-9706细胞中磷酸化蛋白p-PI3K、p-AKT、mTOR、NF-κB和cleaved-Capase-3 m RNA和蛋白表达水平。结果姜黄素可以显著抑制食管癌Ec-9706细胞的增殖和生长,显著降低Ec-9706细胞的存活率,促进食管癌Ec-9706细胞的凋亡,显著升高Ec-9706细胞的凋亡率,且呈时间剂量反应关系,差异有统计学意义(P0.05)。姜黄素可以显著降低食管癌Ec-9706细胞PI3K、AKT、mTOR m RNA表达和蛋白含量,显著升高NF-κB和cleaved-Capase-3m RNA表达和蛋白含量,且呈时间剂量反应关系,差异有统计学意义(P0.05)。结论姜黄素可有有效抑制食管癌细胞(Ec-9706)增殖,PI3K/AKT/mTOR信号通路在此过程中起到重要的调节作用。     

薯蓣皂苷对卵巢癌细胞体外转移活性及PI3K/AKT通路的影响

目的 探讨薯蓣皂苷对卵巢癌细胞生物学行为以及对PI3K/AKT通路的影响。方法 将卵巢癌细胞分为对照组、薯蓣皂苷组和PI3K/AKT通路抑制剂组，CCK-8实验检测细胞增殖能力；细胞划痕实验分析细胞迁移能力；Transwell实验分析细胞侵袭能力；流式细胞术分析细胞凋亡率；蛋白免疫印迹实验分析细胞PI3K/AKT通路蛋白的表达情况。结果 与对照组比较，薯蓣皂苷组和抑制剂组细胞的增殖能力、迁移和侵袭能力显著降低，凋亡率增加，p-PI3K和p-AKT蛋白表达水平降低。结论 薯蓣皂苷通过抑制PI3K/AKT信号通路抑制卵巢癌细胞的增殖、侵袭和迁移能力，并促进卵巢癌细胞凋亡。     

氧化苦参碱通过下调HOTAIR表达抑制卵巢癌SKOV3细胞增殖及机制

目的研究氧化苦参碱(oxymatrine,OMT)对卵巢癌SKOV3细胞增殖的影响及其可能机制。方法培养SKOV3细胞,应用不同浓度OMT作用不同时间后,应用CCK-8检测细胞增殖的变化;应用Real-Time PCR法检测OMT作用不同时间后,HOTAIR在SKOV3细胞中的表达的变换;应用Lipofect Amine 2000,将HOTAIR过表达慢病毒载体以及其阴性对照转染至SKOV3细胞后,给予OMT,应用CCK-8法检测SKOV3细胞增殖变化,应用Western Blot检测SKOV3细胞Bcl-2以及Bax的蛋白表达含量变化,计算Bcl-2/Bax的比值。结果 OMT明显抑制了SKOV3细胞增殖,并呈时间和剂量依赖;OMT明显降低了HOTAIR在SKOV3细胞中的表达水平,表现为剂量相关;转染HOTAIR过表达慢病毒载体后,OMT抑制增殖的作用被阻断,SKOV3细胞的增殖能力基本恢复,SKOV3细胞中Bcl-2/Bax的比值基本恢复。结论 HOTAIR参与了OMT抑制SKOV3细胞增殖调控过程,其机制可能与调控凋亡相关蛋白Bcl-2和Bax表达相关。     

雷公藤多甙对耐顺铂人上皮卵巢癌细胞体外活性的影响及机制研究

目的：探讨传统中药雷公藤多甙（Tripterygium Wilfordii HookF,GTW）对耐顺铂人上皮卵巢癌细胞体外活性的影响及机制研究。方法：将顺铂、不同浓度雷公藤多甙及二者联合处理SKOV3/DDP细胞24 h,于倒置相差显微镜及荧光倒置显微镜下观察细胞形态学变化;采用Hochest 33258染色法计算细胞平均凋亡率;流式细胞术检测细胞周期变化;Western blot检测P13K/Akt/NF-κB信号通路相关因子PI3K、T-AKT、p-AKT(ser473)、IκBα、NF-κB、Bcl-2的表达变化。结果：SKOV3/DDP细胞经不同浓度雷公藤多甙处理24 h后,出现典型的凋亡样改变;且凋亡率呈浓度依赖性,顺铂联合组凋亡率较相应单药组明显升高;SKOV3/DDP细胞经雷公藤多甙处理24 h后,S期细胞比例明显升高,升高程度呈浓度依赖性（P<0.05）,雷公藤多甙与顺铂联合组S期细胞比例与相应单药组相比均明显升高;雷公藤单药及雷公藤、顺铂联合处理SKOV3/DDP细胞24 h后,p-AKT、NF-κB、Bcl-2蛋白表达明显下调。结论：雷公藤多甙可使耐顺铂人上皮卵巢癌SKOV3/DDP细胞周期阻滞于S期并诱导其凋亡,与小剂量顺铂联用效用明显增加,其机制可能与p-AKT、 NF-κB、 Bcl-2表达下调,抑制P13K/Akt/NF-κB信号通路有关。     

低温致乳鼠心肌细胞损伤中Bim蛋白的作用及PI3K/Akt相关机制

背景：寒冷刺激可引发心血管疾病或导致其加重,研究极端气候条件下心血管疾病的发病规律及其分子生物学机制对制定有效的防范和治疗措施有重要意义。 目的：观察低温对心肌细胞凋亡率、乳酸脱氢酶活性及促凋亡蛋白Bim表达的影响,并从PI3K/Akt信号通路探讨低温影响心肌细胞中Bim表达的可能途径。 方法：将体外培养的心肌细胞在4 ℃冷水浴中处理1 h后,放入37 ℃ CO₂培养箱中继续培养0,4,8,12,16,24 h,Annexin V-FITC/PI双染检测细胞凋亡率,MTS/PMS法检测细胞存活情况,全自动生化分析仪测细胞培养基中乳酸脱氢酶活性。Western blot测定Bim在心肌细胞中的表达情况,并在Bim蛋白开始表达的时间点向培养的心肌细胞中加入PI3K/Akt阻断剂LY29004,观察心肌细胞凋亡率、乳酸脱氢酶活性及Bim、p-PI3K蛋白表达的变化。  结果与结论：冷处理后,心肌细胞凋亡率增加、存活率降低、培养基中乳酸脱氢酶活性增高、Bim表达增加(P < 0.05),均在冷处理后24 h达到极点。加入LY29004后,心肌细胞凋亡率增加更明显,培养基中乳酸脱氢酶活性及Bim表达也有所增加,p-PI3K表达降低(P < 0.05)。说明低温能够通过促进Bim表达诱导心肌细胞凋亡,而PI3K/AKT信号通路可能参与了Bim的诱导表达。     

A comparison of the biochemical properties of the human diaphorase (DIA3) isozymes determined by the common alleles DIA13, DIA23 and DIA33

(1) Various buffer systems for the starch gel electrophoresis of human diaphorase isozymes have been explored. Electrophoresis in a Tris/Borate system at pH 8.6 which includes 70 micron NADH in the gel and cathodal electrode buffers, provides good resolution of the six DIA3 phenotypes previously resolved by isoelectric focusing. (2) The variant genes DIA13, DIA23 and DIA33 occur with frequencies of about 0.76, 0.23 and 0.01 respectively in the English population. (3) The isozymes determined by the least common gene, DIA33, are markedly different from the isozymes determined by DIA13 and DIA23 in their relatively low heat stability, high affinity for Blue Sepharose and slow anodal electrophoretic mobility in buffer systems containing borate. The DIA3 1 and DIA3 2 isozymes are similar to one another in these characteristics.     

Adsorption of propylene and allene on TiCl3·1/3 AlCl3 and polymerization of allene with the system TiCl3·1/3 AlCl3/AlEt2Cl

Adsorption of propylene and allene from the gas phase on TiCl₃·1/3 AlCl₃ and TiCl₃·1/3 AlCl₃/AlEt₂Cl catalyst was measured volumetrically. In the ranges of 296–334 K and 1–100 kPa, the adsorbed amounts of both gases was found to be approximately proportional to the gas pressure. The adsorbed amount of allene is about twice as high as that of propylene under the same conditions. Low heats of adsorption of both propylene and allene support the assumption of the physical nature of the adsorption. Addition of AlEt₂Cl to the TiCl₃·1/3 AlCl₃ catalyst did not change substantially the sorption properties of the catalyst. Polymerization of allene with the system TiCl₃·1/3 AlCl₃/AlEt₂Cl in heptane was found to be first order in monomer and the rate decreases with increasing yield. A mechanism of retardation by the polymer formed is probably operative. Both heptane-soluble and heptane-insoluble polyallenes are produced. The soluble polymer has M?_n ≈ 10³ and a very narrow molecular weight distribution (M?_w/M?_n = 1,2 ± 0,2). Polyallene comprises mainly vinylidene units.     

Pathogenicity of PMV-3/parakeet/Netherlands/449/75 for chickens

Infection of 1-day-old chicks with PMV-3/parakeet/Netherlands/449/75 (449) by intramuscular, intranasal or contact routes resulted in severe impairment of growth in all groups compared to uninfected control birds. In the group infected intramuscularly with 449 virus 16/22 birds died within 14 days of infection. No clinical signs were seen in 6-week-old chickens infected with 449 by intramuscular, intranasal or contact routes. One-day-old chicks infected with a large dose of NDV-B(1) and one-day-old chicks placed in contact with these birds also showed significant impairment of growth compared to uninfected controls.     

Mitomycin C-treated 3T3/B (3T3/A31) cell feeder layers in hybridoma technology

Several methods were compared for their efficiency at supporting the growth of hybridoma cells at low cell densities. Soluble growth factors from different sources gave poor results, whereas actively metabolising syngeneic cells proved to be effective feeder systems. Of the latter, the transformed subline of BALB/c embryo fibroblast 3T3/B cells - 3T3/A31 - were best. Macrophage (peritoneal exudate) feeder layers could be as effective as the 3T3/A31 cells, but were much more variable, probably reflecting the physiological state of the donor mice, the degree of sensitisation of the cells in vitro and the rate of recovery after isolation from the peritoneal cavity. Since the 3T3/A31 cells could replicate more rapidly than the hybridoma cells, division of the feeder cell chromosomes was inhibited using mitomycin C; 1-2 X 10(4) 3T3/A31 cells/ml were treated with 1 microgram/ml mitomycin C for 8-16 h at 37 degrees C, washed, and incubated for 3-7 days at 37 degrees C. The latter incubation was to permit the metabolism and breakdown of unreacted but intracytoplasmic drug, and the establishment of an active feeder layer before use with the hybridoma cells.     

HISTOCOMPATIBILITY DIFFERENCE BETWEEN C3HfeB/HeN AND C3H/HeN MICE: TUMOUR INDUCED IN C3HfeB/HeN MICE EXPRESSES C3H/HeN-ASSOCIATED ALLOANTIGEN

A transplacentally induced lung tumour of C3HfeB/HeN mouse origin expresses, as a tumour-associated antigen, a normal tissue component of strain A mice. The genetic locus coding for this alloantigen has been shown to be linked to the H-2 major histocompatibility complex. In the present study we demonstrate that this antigen is also expressed on normal tissues of C3H/HeN mice. Skin grafts exchanged between C3HfeB/HeN and C3H/HeN mice are reciprocally rejected at approximately 3 weeks after grafting. C3HfeB/HeN mice were derived from C3H/HeN mice in 1945. These strains have apparently deviated since then in their genetic regulation of the expression of the MHC-linked genetic locus. The finding of the C3H/HeN-associated antigen on a C3HfeB/HeN mouse-derived lung tumour indicates that this deviation is reversible.