多亮氨酸重复区免疫球蛋白样蛋白1对U251胶质瘤细胞基因表达的影响

目的 运用基因芯片技术研究多亮氨酸重复区免疫球蛋白样蛋白1（leucine-rich repeats and immunoglobulin-like domains 1,LRIG1）对U251胶质瘤细胞基因表达的影响。方法 提取正常U251细胞和转染了LRIG1的U251细胞的RNA,并反转录为cDNA,加用cy3、cy5染色标记后使用Roche-NimbleGen人全基因组表达谱芯片检测LRIG1对U251胶质瘤细胞基因表达的影响。结果 转染LRIG1的U251细胞相对U251细胞,差异基因为808条,其中上调基因有397条,下调基因有411条,包括细胞骨架、细胞增殖、细胞凋亡、生长代谢等相关基因。结论 基因芯片能够高效地初步检测差异基因表达,有助于揭示LRIG1作用于胶质瘤细胞的分子机制。     

灵芝酸A对人胶质瘤细胞U251细胞增殖、凋亡和侵袭的影响

目的探讨灵芝酸A对人胶质瘤细胞U251细胞凋亡、侵袭及KDR表达的影响。方法制备灵芝酸A,以人胶质瘤细胞细胞U251细胞为研究对象,根据细胞培养液所含灵芝酸A的不同浓度,将实验分为空白对照组(等量细PBS)、灵芝酸A低浓度组(0.1 mmol/L)和高浓度组(0.5 mmol/L)。用RT-PCR和Western blot法分别从mRNA水平和蛋白水平检测KDR基因的表达,CCK-8法测定细胞体外增殖能力,流式细胞技术(flowcytometry,FCM)检测各组细胞周期和凋亡情况,TUNEL染色检测各组细胞的的凋亡,细胞侵袭小室法检测各组细胞的体外侵袭力。结果 RT-PCR和Western blot显示,灵芝酸A高浓度组和低浓度组较空白对照组的KDR mRNA和蛋白表达都明显下降;灵芝酸A高浓度组和低浓度组细胞的生长速度明显减慢,降低G1期细胞比例,S期和G2/M期比例增高;与空白对照组相比,高浓度组和低浓度组细胞的凋亡率明显升高(P0.01),增殖、侵袭能力显著下降(P0.05);高浓度组和低浓度组细胞相比促进凋亡和抑制KDR表达的作用更明显(P0.05)。结论灵芝酸A可诱导人胶质瘤细胞U251细胞凋亡,抑制其增殖和侵袭能力,并能抑制Kdr DR mRNA和蛋白的表达,提示这可能是其抗肿瘤的作用机制之一。     

HIF—la asODN转染的树突状细胞对胶质瘤细胞生长的影响

目的研究缺氧诱导因子-1a（HIF-1a）反义寡核苷酸（asODN）转染的树突状细胞（DC）与U251胶质瘤细胞融合后的抗胶质瘤活性。方法将HIF-1a asODN利用脂质体包裹转染DC,采用PEG化学融合方法将DC与U251胶质瘤细胞融合,通过MTT法及流式细胞仪检测胶质瘤细胞凋亡率。结果HIF-1a asODN转染DC组与各对照组相比细胞增殖下降,凋亡增加（P〈0．01）。结论HIF-1a asODN转染DC后,再与U251胶质瘤细胞融合能够比单纯使用HIF-1a asODN转染U251细胞或单纯使用DC细胞取得更好的抑制胶质瘤细胞生长及促进其凋亡的效果。     

蒿甲醚联合依托泊苷对小细胞肺癌细胞株H446增殖及侵袭的抑制作用

探讨蒿甲醚与依托泊苷联用对小细胞肺癌细胞H446增殖及侵袭能力的抑制作用。采用MTT法检测蒿甲醚、依托泊苷单用及联合作用对H446细胞增殖的影响;采用Annexin V/PI荧光双染法检测蒿甲醚、依托泊苷单用及联合作用对H446细胞凋亡的影响;采用PI单染法检测蒿甲醚、依托泊苷单用及联合作用对H446细胞周期分布的影响。采用基质胶侵袭实验检测蒿甲醚、依托泊苷单用及联合作用对H446侵袭能力的影响。结果表明,蒿甲醚、依托泊苷单用以及联合使用均能有效抑制H446的增殖,且呈剂量依赖性,两药联用具有协同作用。蒿甲醚单用不能明显促进细胞凋亡,但与依托泊苷(300 nmol/L)联用72 h可以比较明显促进H446凋亡,具有统计学意义(P<0.05)。蒿甲醚单用对H446的细胞周期没有显著影响,联合作用48 h对细胞周期G₂期阻滞主要是依托泊苷的作用。单用蒿甲醚、依托泊苷以及二者联合使用都能显著抑制H446的侵袭能力。     

血根碱与顺铂联用对膀胱癌EJ细胞凋亡的影响

探讨血根碱与顺铂联用对膀胱癌EJ细胞凋亡的影响。应用CCK-8法检测不同浓度血根碱处理膀胱癌EJ细胞并计算IC₅₀;应用Annexin V FITC/PI法检测空白对照组、血根碱组、顺铂组及联合用药组对细胞凋亡的影响应用;流式仪检测细胞周期阻滞情况;Western blot检测联合用药组对Bcl-2表达的影响;构建裸鼠皮下成瘤模型,进一步验证联合用药组对膀胱癌EJ细胞凋亡以及对荷瘤小鼠减毒作用的影响;同时,通过对小鼠重要脏器的HE染色评估血根碱的安全性。结果表明,血根碱能明显抑制EJ细胞增殖,与空白对照组相比,联合用药组EJ细胞凋亡显著（P < 0.05）,且更多的EJ细胞被阻滞在G₂/M期,联合用药组显著下调Bcl-2的表达（P < 0.001）。裸鼠皮下成瘤模型中,同空白对照组相比,联合用药组中小鼠肿瘤生长明显变缓,细胞凋亡明显增加（P < 0.05）。联合用药对荷瘤小鼠有减轻顺铂副作用的效果,血根碱的生物安全性高,副作用小。实验结果表明,血根碱与顺铂联合用药可通过引起细胞G₂/M阻滞,下调Bcl-2的表达,促进细胞凋亡,进而抑制肿瘤生长。     

青蒿琥酯对口腔鳞癌Tca8113细胞及其移植瘤小鼠的抗肿瘤作用研究

目的 观察青蒿琥酯对口腔鳞癌Tca8113细胞增殖和凋亡的影响,以及对Tca8113细胞移植瘤小鼠肿瘤生长的影响。方法 用不同质量浓度的青蒿琥酯处理Tca8113细胞,HE染色观察细胞形态的改变;MTT法检测细胞增殖的情况;流式细胞仪检测细胞凋亡和细胞周期的变化。用口腔鳞癌Tca8113细胞建立口腔鳞癌淋巴道转移模型,ip给予移植瘤小鼠青蒿琥酯200 mg/(kg?d),连续给药10 d,观察青蒿琥酯对肿瘤生长抑制作用,以5-氟尿嘧啶（5-FU）作为阳性对照。结果 青蒿琥酯作用Tca8113细胞后,形态学观察可见细胞凋亡现象,部分细胞明显肿胀、变圆、变大,溶解成碎片,甚至死亡;细胞增殖受到抑制且呈时间、剂量相关性;青蒿琥酯能有效诱导Tca8113细胞凋亡并呈时间、剂量相关性,还能将Tca8113细胞阻滞在G₀/G₁期。体内实验显示,青蒿琥酯对Tca8113细胞移植瘤具有明显的抑制作用,抑瘤率为41.18%。结论 青蒿琥酯体内及体外对口腔鳞癌Tca8113细胞均有抑制作用,其机制可能与青蒿琥酯诱导细胞凋亡或改变细胞周期的分布有关。     

circRNA CCND1对人肝癌HepG2细胞增殖、凋亡、侵袭和迁移的影响

目的 探讨circRNA CCND1对人肝癌HepG2细胞增殖、凋亡、侵袭和迁移的影响。方法 采用荧光原位杂交(FISH)实验及实时荧光定量聚合酶链反应(qRT-PCR)检测circRNA CCND1在HepG2细胞及L02细胞中的表达情况;进一步干扰及过表达circRNA CCND1后,通过qRT-PCR检测circRNA CCND1在HepG2细胞中的表达情况,CCK-8法和EDU法检测HepG2细胞增殖情况,流式细胞术检测细胞凋亡、细胞周期,Transwell实验检测细胞侵袭情况,划痕实验检测细胞迁移情况。结果 HepG2细胞circRNA CCND1相对表达量较LO2细胞高(P <0.05)。Si-circRNA CCND1组circRNA CCND1相对表达量较Control组和Si-NC组下降(P <0.05),Oe-circRNA CCND1组较Control组和Oe-NC组升高(P <0.05)。各组细胞培养0、24、48、72和96 h后细胞增殖活性比较,经重复测量设计的方差分析,结果：(1)不同时间点细胞增殖活性比较,差异有统计学意义(P <...     

长链非编码RNA ATB调控miR-144对胶质瘤迁移和侵袭的影响

目的 探讨长链非编码RNA ATB （lncRNA ATB）调控miR-144对胶质瘤迁移和侵袭的影响。方法 采用qPCR检测lncRNA ATB在胶质瘤组织和癌旁正常组织中的表达差异以及慢病毒si-ATB对胶质瘤细胞的转染效率情况;通过双荧光素酶报告基因进行检测lncRNA ATB和miR-144之间的关系;通过平板克隆实验检测lncRNA ATB对胶质瘤细胞株U87和U251增殖能力的影响;流式细胞术检测lncRNA ATB对胶质瘤细胞株凋亡行为的影响;Transwell实验检测lncRNA ATB对细胞株侵袭能力的影响;裸鼠体内实验检测lncRNA ATB对裸鼠移植瘤的体积和质量的影响情况。结果 胶质瘤lncRNA ATB的表达水平高于癌旁正常组织（P<0.05）,高水平lncRNA ATB患者的生存率低于低水平lncRNA ATB患者;使用si-ATB1和si-ATB2分别转染胶质瘤U87和U251细胞后,lncRNA ATB的表达水平降低;过表达miR-144后,野生型lncRNA ATB的荧光素酶活性受到抑制,对突变型lncRNA ATB的荧光素酶活性影响不明显。转染si-ATB 24、48和72小时后,U87[（186.4±12.4）个比（73.6±8.6）个比（62.6±5.6）个,P<0.05]和U251细胞[（192.2±15.3）个比（63.6±6.3）个比（68.3±7.6）个,P<0.05]和U251细胞的增殖能力低于对照组;lncRNA ATB的下调提高了U87和U251凋亡百分比（P<0.05）;抑制lncRNA ATB后,U87细胞和U251细胞的细胞侵袭能力降低;与对照组相比,si-ATB组肿瘤体积和肿瘤重量均小于或低于对照组（P<0.05）。结论 lncRNA ATB通过调控miR-144的表达促进胶质瘤细胞的生物学行为。     

Arsenic Trioxide Inhibits Proliferation in K562 Cells by Changing Cell Cycle and Survivin Expression

To study the mechanisms involved in the inhibition of chronic myeloid leukemic cells (K562) proliferation induced by arsenic trioxide (As2O3) and to explore the potential role of Survivin, an inhibitor of apoptosis protein, in the regulation of As203 induced cell apoptosis, K562 cells were cultured with As203 of different concentrations. Cells were collected for proliferation analysis by MTT assay. Cell cycle distribution and cell apoptosis were analyzed by flow cytometry. Expression of Survivin protein and mRNA were detected by flow cytometry and RT-PCR, respectively. Our results showed that As2O3 (2-10/μmol/L) inhibited K562 cells growth effectively, but it did not induce cells apoptosis significantly. The percentage of K562 cells at G2/M phase increased in proportion to As2O3 concentrations, and the expression of Survivin mRNA and content of Survivin protein was up-regulated accordingly. It is concluded that As2O3 inhibited K562 cells growth by inducing cell cycle arrest mainly at G2/M phase. Over-expression of Survivin gene and protein might be one of the possible mechanisms contributing to K562 cells‘ resistance to As2O3-induced apoptosis.     

Growth-inhibiting and apoptosis-inducing effects of Tanshinone II A on human gastric carcinoma cells

Summary To explore the effects of Tanshinone II A on the proliferation, apoptosis and gene expression of p53 and bcl-2 in human gastric carcinoma MKN-45 cells. Cell count and MTT assay were used to study the proliferation-inhibiting effect of Tanshinone II A on MKN-45 cells. The effect of Tanshinone II A on the cell cycle and apoptosis of MKN-45 cells were examined by propidium iodide (PI) staining and flow cytometry. Semi-quantitative RT-PCR was used to further verify the expression of p53 and bcl-2 gene after exposure to Tanshinone A in MKN-45 cells. The results showed that Tanshinone A significantly inhibited the growth and proliferation of MKN-45 cells in a dose-and time-dependent manner (P<0.05). Tanshinone A arrested MKN-45 cells in G₂/M phase which led to an obvious accumulation of G₂/M phase cells while decreased number of G₀/G₁ phase cells. This resulted in apoptosis of MKN-45 cells and the apoptosis rate was as high as 43.91% after treatment with 2.0 μg/mL Tanshinone II A for 96 h. It was also found that Tanshinone II A up-regulated expression of p53 gene and down-regulated expression of bcl-2 gene. The cytostatic and antiproliferative effect of Tanshinone II A makes it a promising anticancer agent for the treatment of gastric carcinoma.     

Effects of betulinic acid on proliferation and apoptosis in Jurkat cells and its in vitro mechanism

Summary  The anti-cancer effects of betulinic acid (BA) on Jurkat cells and its in vitro mechanism were examined by using MTT assay. Apoptosis was detected by using Hoechst33258 staining and annexin-V/PI double-labeled cytometry. The effects of betulinic acid on the cell cycle of Jurkat cells were studied by propidium iodide method. RT-PCR and Western blotting were used to analyze the changes of cyclin D3, bcl-xl mRNA and protein levels in Jurkat cells after treatment with betulinic acid. Our results showed the proliferation of Jurkat cells was decreased in betulinic acid-treated group with a 24-h IC50 value being 70.00 μmol/L. Betulinic acid induced apoptosis of Jurkat cells in a time- and dose-dependent manner. The number of Jurkat cells treated with betulinic acid showed an increase in G₀/G₁ phase and decrease in S phase. After treatment with 0, 20, 60, 100 μmol/L betulinic acid for 24 h, the number of Jurkat cells was increased from (31.00±1.25)% to (58.84±0.32)% in G₀/G₁ phase, whereas it was decreased from (61.45±1.04)% to (35.82±1.95)% in S phase. PBMCs were less sensitive to the cytotoxicity of betulinic acid than Jurkat cells. The expressions of cyclin D3, bcl-xl mRNA and protein were decreased sharply in Jurkat cells treated with betulinic acid. It is concluded that betulinic acid is able to inhibit the proliferation of Jurkat cells by regulating the cell cycle, arrest cells at G₀/G₁ phase and induce the cell apoptosis. The anti-tumor effects of betulinic acid are related to the down-regulated expression of cyclin D3 and bcl-xl. Zi CHEN, Female, born in 1980, Resident This project was supported by a grant from the National Natural Sciences Foundation of China (No. 30500686).     

干扰RNA沉默tpd52基因对胶质瘤细胞增殖及凋亡的影响

目的 探究沉默tpd52基因表达后对胶质瘤U87细胞增殖、周期及凋亡的影响.方法 将携带着shRNA-tpd52(抑制tpd52的核苷酸序列)、shRNA-NC(阴性对照的核苷酸序列)的慢病毒体外转染胶质瘤细胞系U87.在转染48 h后荧光显微镜下观察表达GFP细胞数量,采用荧光定量PCR、Western blot分别检测TPD52 mRNA及蛋白表达量,MTT检测细胞增殖能力,流式细胞术检测细胞周期分布,Annexin V和PI双染流式细胞术检测细胞凋亡.结果 U87细胞转染率>90%,与shRNA-NC组及空白对照组相比较,shRNA-tpd52组细胞TPD52 mRNA及蛋白表达量明显减少(P<0.01),而且细胞增殖能力明显下降,差异有统计学意义(P<0.05);细胞周期被阻滞在G0/G1期、细胞凋亡比例明显增加(P<0.05).结论 沉默胶质瘤细胞中tpd52基因表达后,可以有效抑制细胞增殖,阻滞细胞周期,促进细胞凋亡.     

PKR、eIF-2α在 IL-24诱导胶质瘤细胞凋亡中的作用研究

目的：探讨白细胞介素24（interleukin-24,IL-24）对胶质瘤细胞凋亡的影响以及双链RNA蛋白激酶R （double-stranded RNA-dependent protein kinase,PKR）、真核细胞翻译起始因子2α（eukaryotic initiation factor 2α, eIF-2α）在其中的作用。方法将载有 IL-24基因的 Ad5F35型重组腺病毒（Ad-IL-24）及载有增强绿色荧光蛋白（enhanced green fluorescent protein,EGFP）基因作为对照的 Ad5F35型重组腺病毒（Ad-EGFP）转染入胶质瘤细胞U87和 U251中,应用流式细胞仪检测胶质瘤细胞 U87和 U251中的凋亡情况,并检测 U87和 U251各组中 PKR、磷酸化 PKR（phosphorylation-PKR,pPKR）、eIF-2α及磷酸化 eIF-2α（phosporylation-eIF-2α,peIF-2α）的表达情况。结果在胶质瘤细胞 U87和 U251中转染 IL-24后的细胞凋亡率为12．3％和13．0％,明显高于空白组与对照组,并且转染 IL-24的胶质瘤细胞中 PKR、pPKR、eIF-2α及 peIF-2α的表达增加。结论 IL-24可能在胶质瘤细胞中通过上调 PKR、eIF-2α的表达及其活化,促进胶质瘤细胞凋亡。     

汉防己甲素对人神经母细胞瘤SH-SY5Y增殖和凋亡的影响

目的 探讨汉防己甲素对神经母细胞瘤SH-SY5Y细胞株的增殖抑制和诱导凋亡的作用。方法 通过CCK-8实验检测汉防己甲素对于细胞生长的抑制率,流式细胞术检测Tet作用于细胞后,对细胞活性氧、线粒体膜电位、凋亡和周期的影响。结果 汉防己甲素能显著抑制SH-SY5Y细胞生长,基本呈时间－剂量依赖性。流式细胞术检测显示不同浓度汉防己甲素处理后,活性氧明显升高,线粒体膜电位明显下降,细胞凋亡比例明显升高,G₀/G₁期细胞占比明显增高。结论 汉防己甲素能够抑制SH-SY5Y细胞增殖并且诱导其发生凋亡。     

Effects of cyclin D1 antisense oligodeoxyneucleotides on the growth and expression of G<Subscript>1</Subscript> phase regulators in gastric carcinoma cells

Summary To investigate the effects of Cyclin D1 antisense oligodeoxyneucleotides (ASODN) on the growth, cell cycle progression and expression of G₁ phase regulators in human gastric carcinoma cell lines SGC7901 and HS746T, phosphorothioate-modified Cyclin D1 ASODN were encapsulated by Lipofect AMINE2000 and transfected into gastric carcinoma cells. Dose-dependent inhibitory effects were induced by Cyclin D1 ASODN in two gastric carcinoma cell lines. Treatment of gastric carcinoma cells with 0.2 μmol/L CycliN D1 ASODN for 24 h could significantly inhibit their growthin vitro andin vivo, reduce expression of Cyclin D1mRNA to 26.3% (SGC7901) and 17.3% (HS746T) respectively. The percentage of cells in G₀/G₁ phase was increased as revealed by flow cytometry. Immunohistochemical staining showed that the expression of p21 was increased and the expression of Cyclin D1 and pRb was decreased in the two cell lines; the expression of p27 was increased in HS746T, but unchanged in SGC7901. Cyclin D1 ASODN could inhibit the growth and the expression of Cyclin D1 mRNA in gastric carcinoma cells, influence the cell cycle and expression of its regulators. SHUAI Xiaoming, male, born in 1972, Doctor in Charge     

LRIG1在卵巢浆液性囊腺癌细胞对依托泊苷敏感性中的作用研究

目的  探讨亮氨酸重复序列免疫球蛋白样结构域基因-1（LRIG1）在卵巢浆液性囊腺癌（SKOV3）细胞株中对依托泊苷敏感性的可能机制。方法  噻唑蓝比色法（MMT）检测不同浓度VP16干预下48 h的SKOV3细胞组、siRNA LRIG1转染SKOV3细胞组、SKOV3/VP16细胞组和siRNA LRIG1转染SKOV3/VP16细胞组的增殖。平板克隆检测细胞增殖,流式检测细胞凋亡情况,实时荧光定量聚合酶链反应（qRT-PCR）检测LRIG1 mRNA表达。结果  半抑制浓度（IC50）分别为62.90、115.49、156.50和195.42μg/L,siRNA LRIG1转染SKOV3、SKOV3/VP16和siRNA LRIG1转染SKOV3/VP16的耐药指数分别为1.8、2.5和3.1。SKOV3、siRNA LRIG1转染SKOV3、SKOV3/VP16和siRNA LRIG1转染SKOV3/VP16细胞组的克隆率（F =39.338,P =0.000）,细胞的LRIG1 mRNA（F =63.095,P =0.000）和凋亡细胞（F =230.046,P =0.000）明显不同,与SKOV3比较,siRNA LRIG1转染SKOV3、SKOV3/VP16和siRNA LRIG1转染SKOV3/VP16细胞的克隆率增加（t =0.026、0.0710和0.125,P =0.042、0.000和0.000）,细胞的LRIG1 mRNA降低（t =0.130、0.525和0.825,均P =0.000）,凋亡细胞减少（t = 12.350、35.506和44.412,均P =0.000）,与siRNA LRIG1转染SKOV3比较,SKOV3/VP16和siRNA LRIG1转染SKOV3/VP16细胞的克隆率增加（t =0.044和0.099,P =0.001和0.000）,LRIG1 mRNA降低（t =0.395和0.695,均P =0.000）,凋亡细胞减少（t =23.156和32063,均P <0.05）,与SKOV3/VP16比较,siRNA LRIG1转染SKOV3/VP16细胞的克隆率增加（t =0.055,P =0.000）,细胞的LRIG1 mRNA降低（t =0.300,P =0.000）,凋亡细胞减少（t =8.906,P =0.000）。结论  LRIG1 mRNA影响SKOV3细胞对药物的敏感性,沉默LRIG1的耐药细胞可抑制SKOV3细胞凋亡。

     

Curcumin down-regulates PCNA, cyclin D1 and Bcl-XL expression in human keratinocyte cell lines

Objective：To evaluate the effects of curcumin on regulating the proliferation,cell cycle distribution,apoptosis and relevant mechanisms in keratinocyte cell lines.Methods：The human immortalized human keratinocyte lines（HaCaT cells） were treated with different doses of curcumin.The effects of curcumin on cell viability were measured by MTT assay,and the cell cycle distribution and apoptosis determined by flow cytometry.The mRNA expression changes of proliferating cell nuclear antigen（PCNA）,cyclin D1 and Bcl-xL were from real-time PCR analysis and the protein levels were detected by Western blotting.Results：Data obtained in the study showed that curcumin could cause significantly inhibitory effect on proliferation in HaCaT cells in a time- and dose-dependent manner.Cell arrest at G1/S phase and significant apoptosis were observed after being treated with curcumin for 24 h.In association with these,the expression of PCNA,cyclin D1 and Bcl-xL were decreased both at mRNA and protein levels for the same treatment.Conclusion：Curcumin can inhibit proliferation,induce cell arrest at G1/S phase and cause apoptosis in HaCaT cells.The decreased expression of PCNA,cyclin D1 and Bcl-xL induced by curcumin contributes to the above effects in vitro.