bFGF反义寡核苷酸对肾癌细胞凋亡的影响

目的: 探讨碱性成纤维细胞生长因子(basic fibroblast growth factor,bFGF)反义寡核苷酸对肾癌细胞凋亡的影响,以期寻找肾癌反义治疗的合适药物.方法: 以脂质体作为转染载体,将bFGF反义寡核苷酸转染人肾癌细胞系786-0,应用RT-PCR和Western印迹法检测转染bFGF反义寡核苷酸后肾癌细胞中bFGF mRNA及其蛋白的表达,应用流式细胞仪检测转染bFGF反义寡核苷酸后肾癌细胞的凋亡率.结果: 与转染错义寡核苷酸组相比,转染bFGF反义寡核苷酸组786-0细胞中bFGF mRNA及其蛋白的表达有明显下降,且转染bFGF反义寡核苷酸可明显提高786-0细胞的凋亡率(P<0.01).结论: 经bFGF反义寡核苷酸作用后,肾癌细胞bFGF的表达受到了抑制,同时促进了肾癌细胞的凋亡,因此应用bFGF反义寡核苷酸治疗肾癌可能是一种较有希望的肿瘤治疗新方法.     

单独及联合转染survivin和bcl-2反义寡核苷酸诱导胆囊癌细胞凋亡的研究

目的:探讨单独及联合转染survivin、bcl-2反义寡核苷酸(AsODN)对胆囊癌细胞系GBC-SD的凋亡促进作用.方法:设计并合成特异性靶向survivin及bcl-2的AsODN.免疫组织化学法观察胆囊癌细胞中Survivin及Bcl-2蛋白的表达情况;实验分为4组:空白对照组、survivin AsODN转染组、bcl-2 AsODN转染组、联合survivin及bcl-2 AsODN转染组.转染24 h 后,采用逆转录-聚合酶链反应(RT-PCR)检测survivin基因表达的变化,电镜下观察细胞形态变化,流式细胞仪技术检测细胞凋亡率,四甲基偶氮唑蓝(MTT)法检测AsODN对细胞的生长抑制率.结果:Survivin及Bcl-2蛋白在胆囊癌细胞中均有较高表达;单独及联合转染survivin及bcl-2 AsODN后,胆囊癌细胞内survivin基因mRNA表达下调47.8%;,电镜下胆囊癌细胞呈典型凋亡样改变;凋亡率分别为11.38%±3.91%(survivin AsODN组)、9.26%±4.15%(bcl-2 AsODN组)、28.45%±6.34%(联合转染组);分别与对照组相比差异有显著性(P＜0.01),而联合转染组同单独转染survivin AsODN组及bcl-2 AsODN组相比差异也有显著性(P＜0.05).各转染组相对于空白对照组的AsODN抑制率分别为54.3%,47.6%,76.5%.结论:Survivin及Bcl-2蛋白在胆囊癌细胞中呈高表达,单独及联合转染survivin和bcl-2反义寡核苷酸可促进胆囊癌细胞凋亡,而联合转染更具显著性.     

Bcl-2反义寡核苷酸增强阿糖胞苷诱导原代白血病细胞凋亡的研究

背景与目的:有研究证实,针对bcl-2mRNA翻译起始区和蛋白编码区的2个有效反义作用靶点的反义寡核苷酸能增强HL-60和K562细胞对阿糖胞苷(Ara-C)、柔红霉素、足叶乙甙的敏感性。本研究观察这两个新靶点的反义寡核苷酸对Ara-C诱导原代培养的急性白血病(AL)、慢性淋巴细胞白血病(CLL)细胞凋亡的影响。方法:用细胞记数法观察细胞的生存情况;免疫荧光标记法通过流式细胞仪检测细胞Bcl-2蛋白水平;用姬姆萨染色法观察并用流式细胞仪检测细胞凋亡。结果:靶向bcl-2mRNA翻译起始区与靶向蛋白编码区的两个反义寡核苷酸分别与Ara-C联合作用AL、CLL细胞48h,细胞的活性受到明显的抑制,分别同无关寡核苷酸(NS-ODN)联合Ara-C组、单用Ara-C组进行比较,差异有显著性(P<0.05)。这两个不同靶点的反义寡核苷酸分别与Ara-C联用均能明显下调AL、CLL细胞Bcl-2蛋白的表达,并且联合作用AL、CLL细胞48h的凋亡细胞百分率分别与NS-ODN联合Ara-C组、单用Ara-C组进行比较,差异有显著性(P<0.05)。与靶向bcl-2mRNA翻译起始区的反义寡核苷酸比较,靶向蛋白编码区的反义寡核苷酸提高AL细胞对Ara-C的敏感性作用要强些(P<0.05)。结论:针对bcl-2mRNA翻译起始区和蛋白编码区两个靶点的反义寡核苷酸能增强Ara-C诱导AL、CLL细胞的凋亡。     

反义寡核苷酸抑制survivin基因表达及肝癌细胞生长的研究

目的:采用反义寡核苷酸抑制肝癌细胞中survivin基因的表达,研究其对肝癌细胞生长的作用.方法:采用脂质体介导survivin反义寡核苷酸转染人肝癌细胞株SMMC-7721细胞,Western blot及原位杂交方法检测survivin蛋白及mRNA表达,流式细胞仪检测凋亡细胞比率,检测转染前后细胞贴壁率变化,并绘制细胞生长曲线.结果:survivin反义寡核苷酸转染后,肝癌细胞survivin蛋白及mRNA表达均显著降低,细胞贴壁率显著降低,细胞增殖活性明显受抑,细胞凋亡率显著增加.结论:survivin反义寡核苷酸转染可以有效降低细胞内survivin基因的表达,诱导细胞发生凋亡,抑制肝癌细胞生长.     

OPN反义真核表达载体的构建及其对肾癌细胞增殖侵袭的影响

背景与目的:骨桥蛋白(osteopontin,OPN)的过表达和多种恶性肿痛的发展和转移密切相关,然而,在肾癌中OPN所扮演的角色尚未被清楚地阐明.为验证其作为肾痛基因治疗靶点的可行性,本研究通过构建获得OPN反义基因真核表达载体转染人肾癌ACHN细胞,观察其对人肾癌细胞增殖及侵袭的影响.方法:提取ACHN细胞总RNA,RT-PCR法扩增获得OPN目的片段,将其反向克隆到pcDNA3.1(-)质粒中构建OPN反义真核表达载体,并转染人肾癌ACHN细胞.采用半定量RT-PCR法和Western印迹法检测OPN mRNA及蛋白的表达情况;MTT法检测对细胞的生长抑制作用;流式细胞术检测对细胞周期和凋亡率的影响;软琼脂克隆形成实验和Transwell法分别检测细胞的增殖和侵袭能力.结果:RT-PCR检测OPN mRNA表达量结果显示,转染重组质粒细胞中的OPN mRNA的表达量为0.29±0.04,与转染空质粒细胞的0.86±0.05和未转染细胞的0.88±0.04相比,差异有统计学意义(P<0.05).MTT法检测结果显示ACHN/OPN细胞的生长速度受到抑制;流式细胞检测结果显示ACHN/OPN细胞生长停滞于S期且凋亡率明显升高;软琼脂克隆形成实验及Transwell实验结果显示细胞的增殖和侵袋能力下降(P<0.05).结论:OPN在肾癌ACHN细胞的增殖和侵袭过程中发挥了重要作用,反义OPN基因能抑制肾癌细胞的恶性表型.     

bcl-2基因反义寡核苷酸增强放射线诱导Raji细胞凋亡的研究

目的研究bcl-2基因反义寡核苷酸作用淋巴瘤细胞株Raji后,放射线对细胞凋亡的影响.方法bcl-2基因反义寡核苷酸作用Raji细胞后,台盼蓝拒染法计数活细胞;免疫荧光标记观测细胞Bcl-2蛋白水平;用姬姆萨染色和碘化丙啶染色法、流式细胞仪检测细胞凋亡.结果bcl-2基因反义寡核苷酸与放射线联合作用Raji细胞,显著抑制细胞的生长,并呈时间依赖性,活细胞数分别与单用放射线组及无义寡核苷酸联合放射线组相比,统计学上有显著性差异(P＜0.05).bcl-2基因反义寡核苷酸与放射线联合作用于Raji细胞后显著抑制bcl-2蛋白表达,蛋白水平分别与单用放射线组或无义寡核苷酸联用放射线组比较,差异有显著性(P＜0.05).bcl-2基因反义寡核苷酸与放射线同时作用于Raji细胞后,姬姆萨染色可见凋亡细胞,通过流式细胞仪检测的细胞凋亡率显著增加,分别与单用放射线组或无义寡核苷酸联用放射线组相比,具有显著性差异,P＜0.05.结论bcl-2反义寡核苷酸能增强放射线诱导Raji细胞凋亡.     

bFGF反义硫代寡核苷酸增强人喉鳞癌Hep2细胞的化疗敏感性

目的:研究bFGF反义硫代寡核苷酸增强人喉鳞癌Hep2细胞对多柔比星、氟脲嘧啶及顺铂的敏感性。方法:设计、合成bFGF反义脱氧寡核苷酸(AS),用聚乙烯亚胺(jetPEI)介导bFGF反义脱氧寡核苷酸转染入Hep2细胞;半定量RT- PCR测定bFGF反义硫代寡核苷酸转染后细胞中bFGF mRNA水平;免疫细胞化学法检测Hep2细胞转染前后bEGF的表达水平;FACS分析bFGF反义硫代寡核苷酸诱导细胞的凋亡;MTT法检测bEGF反义硫代寡核苷酸及其与化疗药物联合处理后的细胞增殖。结果:bFGF反义硫代寡核苷酸呈剂量与时间依赖抑制Hep2细胞增殖,最高抑制率为25.5%;被转染细胞bFGF mRNA和蛋白的表达分别降低52.0%和41.1%,细胞凋亡率为20.5%;bFGF反义硫代寡核苷酸协同多柔比星、氟脲嘧啶及顺铂作用Hep2,使3种药物的IC_(50)分别降低75.5%、83.5%及65.4%。结论:bFGF反义硫代寡核苷酸协同化疗药物增强Hep2细胞对化疗药物敏感性,将为人喉鳞癌的生物和化学药物治疗增添新途径。     

碱性成纤维细胞生长因子反义寡核苷酸对肝癌细胞凋亡的影响

目的 检测碱性成纤维细胞生长因子(bFGF)反义寡核苷酸对肝癌细胞凋亡的影响,探讨bFGF作为肝癌治疗靶点的有效性.方法 以脂质体作为转染载体,转染bFGF反义寡核苷酸于HepG2细胞,用共聚焦显微镜和Western blot方法,检测转染bFGF反义寡核苷酸后肝癌细胞株HepG2中bFGF蛋白的表达,用流式细胞仪检测转染bFGF反义寡核苷酸后HepG2细胞的凋亡率.结果 与转染错义寡核苷酸组相比,bFGF反义寡核苷酸对HepG2细胞中bFGF蛋白表达有明显抑制作用,转染bFGF反义寡核苷酸可明显增加HepG2细胞的凋亡率(P＜0.01).结论 bFGF在肝癌细胞凋亡中有重要调节作用,可作为肝癌增敏治疗的有效靶点.     

Survivin反义寡核苷酸对骨肉瘤细胞凋亡的影响

目的:采用survivin反义寡核苷酸(ASODN)封闭骨肉瘤细胞survivin的作用,观察其对骨肉瘤细胞系MG63增殖和凋亡的影响。方法:以脂质体为载体,介导survivin反义寡核苷酸转染人骨肉瘤细胞系MG63,用MTT法测定细胞增殖;流式细胞仪检测转染survivin反义寡核苷酸后细胞凋亡率;Westernblot及半定量RTPCR检测转染survivin反义寡核苷酸后的骨肉瘤细胞survivin蛋白及mRNA表达。结果:脂质体介导survivin反义寡核苷酸转染骨肉瘤细胞系MG63后,细胞增殖明显受到抑制,细胞凋亡率明显增加,骨肉瘤细胞survivin蛋白及mRNA表达均明显降低。结论:脂质体介导转染survivin反义寡核苷酸可以抑制细胞增殖,有效降低细胞内survivin基因的表达,促进细胞凋亡。     

脂质体转染bcl-2反义寡核苷酸诱导Raji细胞凋亡的研究

目的:通过脂质体分别转染bcl-2两个靶点的反义寡核苷酸(ASODN1、ASODN2)及G3139,观察bcl-2反义寡核苷酸对淋巴瘤细胞株Raji凋亡的影响.方法:采用MTT法检测药物的半数抑制率(IC50);免疫荧光标记观察细胞bcl-2蛋白水平;用姬姆萨染色和流式细胞仪观察细胞凋亡.结果:MTT测定显示:ASODN1、ASODN2组IC50值分别与G3139组进行比较无显著差异,P＞0.05.5μmol/L ASODN1、ASODN2作用于Raji细胞72h后,姬姆萨染色均可见凋亡细胞.5μmol/L ASODN1、ASODN2和C3139作用于Raji细胞后,bcl-2蛋白阳性率均明显下降,细胞凋亡率均明显增加,P<0.05,但ASODN1、ASODN2组分别与G3139组进行比较无显著差异,P＞0.05.5μmol/L无义寡核苷酸对Raji细胞的生长活性、bcl-2蛋白水平及细胞凋亡率均无明显影响,P>0.05.结论:针对bcl-2两个靶点的反义寡核苷酸能特异性促进Raji细胞的凋亡,并且与G3139具有近似的反义效应.     

bcl-2反义寡核苷酸对肾癌细胞Bcl-2蛋白表达抑制及诱导凋亡作用

目的:经Beagle犬肝脏血管注射重组腺病毒介导反义c-myc基因(Ad-ASmyc)载体,观测其体内分布及毒副作用,以评价Ad-ASmyc治疗肝癌的临床前期安全性.方法:选择4只体重8～10kg健康Beagle犬,全麻后开腹,经肝动脉或门静脉注射Ad-ASmyc,注射Ad-ASmyc前及注射后第3,7,14,21天取肝组织及抽取静脉血化验,PCR检测Ad-ASmyc在各器官组织中的分布,常规切片观察各器官病理变化,ELISA方法检测血中抗腺病毒抗体的产生.结果:经Beagle犬肝脏血管注射后,Ad-ASmyc可持续转导正常肝细胞达3周,实验犬一般情况好,血、肝、肾功能无明显异常,在肝脏、脾脏、肾脏、胃、心脏、皮肤中可检测到重组腺病毒的分布,镜下可见Ad-ASmyc剂量依赖性的肝组织轻微的炎症反应,注射后7d血中有抗腺病毒载体的抗体产生,14d达高峰,21d开始下降.结论:经Beagle犬肝动脉或门静脉途径注射Ad-ASmyc均可转导至肝细胞,Ad-ASmyc对实验犬的毒副作用较轻.     

Bcl-2反义寡核苷酸诱导胃癌细胞凋亡的研究

目的　探讨反义寡核苷酸（ＡＳＯＤＮ） 对ｂｃｌ２ 基因的表达调控及诱导胃癌细胞凋亡的作用。方法　应用ＭＴＴ方法比较两条人工合成的ＡＳＯＤＮ 直接作用及其以脂质体（ＤＯＴＡＰ） 为载体对胃癌细胞的抑制效果。应用流式细胞术和ＲＴＰＣＲ 方法检测ＡＳＯＤＮ 对ｂｃｌ２ 蛋白和ｍＲＮＡ 表达量的调控。应用相差显微镜、电子显微镜、流式细胞术等方法,观察ｂｃｌ２ ＡＳＯＤＮ 诱导ＢＧＣ８２３ 胃癌细胞凋亡的效果。结果　ＭＴＴ实验显示两条ＡＳＯＤＮ 抑制胃癌细胞增殖的作用呈浓度和时间依赖性,且靶位点于ｍＲＮＡ蛋白编码区（ＡＳＯＤＮ２） 和以ＤＯＴＡＰ 为载体的ＡＳＯＤＮ 对胃癌细胞的增殖抑制效果为佳。ＡＳＯＤＮ作用于胃癌细胞,降低ｂｃｌ２ 蛋白和ｍＲＮＡ 表达。ｂｃｌ２ ＡＳＯＤＮ处理胃癌细胞,观察到肿瘤细胞缩小、凋亡小体出现、染色质浓缩、凋亡峰等凋亡特征性改变。结论　ｂｃｌ２ ＡＳＯＤＮ可降低ｂｃｌ２ ｍＲＮＡ和蛋白表达,诱导胃癌细胞凋亡     

G3139 induces cell death by caspase-dependent and -independent apoptosis on human melanoma cell lines

G3139 is an 18-mer phosphorothioate oligodeoxynucleotide (ODN) which has been targeted on the initiation codon region of the bcl-2 gene. Currently, clinical trials on G3139 for diverse tumors are underway in phase II and phase III. However, basic investigations of bcl-2 antisense ODN (G3139) and reverse ODN (G3622) have not been fully examined. In this report, we investigate cell death caused by G3139 and G3622 and the impact of antisense ODN in melanoma cell lines. We confirmed that G3139 reduced the level of bcl-2 protein and both G3139 and G3622 inhibited cell proliferation and induced apoptosis. G3139 was noted to produce a more intense effect than G3622. Although the general caspase inhibitor, Z-VAD-fmk, prevented apoptosis incompletely, the inhibition ratio of both ODNs was approximately equivalent. Our results suggested that inhibition of cell proliferation by ODNs is produced by apoptosis, but that the apoptotic pathway is not fully induced by the caspase-dependent pathway. Upon examination of the intracellular apoptotic protein dynamics, AIF localized within the mitochondria was translocated to the cytosol within 24 h, and subsequently to the nuclei after 48 h of treatment with G3139. Our results imply the following: the transfection of ODNs can induce apoptosis, the anti-tumor effect of G3139 is better than G3622, and the difference in the anti-tumor effect is specifically based upon the reduction of expression of the target DNA in malignant tumors. We consider that antisense ODNs may be an important tool for anti-tumor chemotherapy and the targeting of specific DNA is important in enhancing the anti-proliferative effect against tumors.     

XIAP反义寡核苷酸抑制胶质瘤细胞增殖和诱导凋亡的体外实验研究

目的观察X连锁凋亡抑制蛋白（XIAP）反义寡核苷酸对人脑胶质瘤细胞系BT325的增殖及凋亡的影响。方法将XIAP全硫代反义寡核苷酸，通过脂质体途径转染BT325脑胶质瘤细胞。用CCK-8实验检测细胞杀伤率，RT-PCR和Western blot技术检测XIAP的mRNA和蛋白表达，JC—1检测细胞线粒体膜电位，流式细胞仪检测细胞凋亡率，比色法检测Caspase-3活性。结果XIAP反义寡核苷酸能够抑制BT325脑胶质瘤细胞的增殖；XIAP反义寡核苷酸使XIAP的mRNA和蛋白表达均明显下调，mRNA较对照组减少了67．8％，蛋白较对照组减少了63．3％；反义寡核苷酸使线粒体膜电位下降，诱导BT325细胞凋亡，反义寡核苷酸组的凋亡率为54．7％，错义链组为14．O％，两组比较，差异具有显著性（P〈0．05）；反义寡核苷酸使BT325细胞Caspase-3活性明显增高，与对照组比较差异有显著性（P〈0．05）。结论XIAP可能参与了脑胶质瘤细胞BT325的增殖和凋亡，下调XIAP可抑制BT325细胞增殖及促进其凋亡。     

肺腺癌细胞系耐药及凋亡相关基因的表达和逆转

目的 探讨顺铂耐药肺腺癌细胞系Ａ５４９＾ＤＤＰ的耐药,凋亡相关基因的表达及其与亲代细胞Ａ５４９的差异,观察差异表达基因的反义寡核苷酸的逆转作用。方法 将人工合成的反义,正义硫代脱氧寡核苷酸（Ｓ－ｏｌｉｇｏｄｌｅｏｘｙｎｕｃｌｅｏｔｉｄｅ,Ｓ－ＯＤＮ）经脂质体包后转染Ａ５４９＾ＤＤＰ细胞,应用ＲＴ－ＰＣＲ检测耐药及凋亡相关基因ｍＲＮＡ水平,免疫细胞化学及流式细胞－抗体检测相应蛋白及增殖抗原Ｋｉ－６７     

Chemosensitization of myeloma plasma cells by an antisense-mediated downregulation of Bcl-2 protein.

An antisense oligodeoxynucleotide (ODN) complementary to the first six codons of the Bcl-2 mRNA, G3139 (oblimersen sodium; Genasense), has been shown to downregulate Bcl-2 and produce responses in a variety of malignancies including drug-resistant lymphoma. Incubation of ex vivo purified plasma cells from patients with multiple myeloma (MM) with carboxyfluorescein (FAM)-labeled antisense ODNs resulted in a time- and dose-dependent uptake in the cytoplasm and nucleus. No major differences in uptake of Bcl-2 antisense ODNs were observed among patients' samples. Incubation of purified myeloma plasma cells with G3139, but not solvent or reverse polarity control ODNs, resulted in a reduction (>75%) of Bcl-2 mRNA levels after 2 and 4 days, as measured by Real-Time PCR. Treatment with G3139 led to a sequence-specific reduction of Bcl-2 protein levels within 4 days of exposure in 10 out of 11 clinical samples from patients with chemosensitive and multidrug-resistant disease, without significant reduction of alpha-Actin, Bax, Bcl-XL, or Mcl-1 proteins. This resulted in a significantly enhanced sensitivity of the myeloma tumor cells to dexamethasone or doxorubicin-induced apoptosis. G3139 can consistently enter myeloma cells, downregulate the expression of Bcl-2, and enhance the efficacy of myeloma therapy. These data support further clinical evaluation of G3139 therapy in multiple myeloma.     

Effect of BcL-2 antisense drug with different structure on the biological function of K562 cells

Objective: To study the differences and similarities of the antisense drugs with different structures on the biological functions of K562 cells. Methods: Cytotoxic effects were measured by use of a cell viability assay. Flow cytometric analysis and agarose gel electrophoresis of DNA fragmentation were also performed. The expression level of protein was assayed by immunofluorescence using fluoresce isothiocyanate label. Results: PNA targeting the coding region of the Bcl-2 messenger RNA could effectively inhibit K562 cell viability, down-regulate the synthesis of the Bcl-2 protein and increase cell apoptosis. By 72 h after the Bcl-2 antisense PNA treatment, K562 cells showed more reduction in the level of Bcl-2 protein compared with cells treated with the antisense ODN. After treatment with 10 μmol/L of Bcl-2 antisense PNA or antisense ODN for 72 h, apoptotic rates of K562 cells were 13.15±1.13 and 11.72±1.12, respectively. Furthermore, there was significant difference in the percentage of apoptotic cells between antisense PNA group and antisense ODN group. Conclusion: The results suggest that antisense PNA targeting the coding region of Bcl-2 mRNA has better antisense effects than the antisense oligonucleotides on inducing apoptosis of K562 cells. Foundation item: This work was supported by the Key Foundation of Science & Technology Program of Guangzhou (No.2001-Z-037-01), and the Nature Science Key Foundation of Guangdong Province (No. 021195). Biography: LEI Xiao-yong(1970–), male, associate professor, doctor of medicine, Institute of Pharmacy and Pharmacology, Nanhua University, majors in tumor pharmacology.