核因子-κB反义寡核苷酸抑制紫外线诱导的HaCaT细胞反义分泌白介素6

目的 探讨核因子-κB(NF-κB)反义寡核苷酸转染体外培养的HaCaT细胞反义株HaCaT后,对紫外线(UV)诱导的HaCaT细胞反义分泌炎症因子白介素6(IL-6)的抑制作用。方法 蛋白质印迹方法测定不同剂量中波紫外线(UVB)辐射HaCaT细胞反义后NF-κBp65的变化;逆转录-聚合酶链反应测定NF-κBp65反义寡核苷酸转染后p65m RNA表达的变化;酶联免疫吸附测定法测定NF-κBp65反义寡核苷酸转染后紫外线辐射的HaCaT细胞反义分泌IL-6水平。结果 10、20、30mJ/cm² UVB辐照HaCaT细胞反义后均可显著促进NF-κBp65表达(P<0.05),不同浓度的NF-κBp65反义寡核苷酸转染后对30mJ/cm² UVB诱导的p65mRNA表达和IL-6分泌均有显著抑制作用(P<0.05)。结论 脂质体介导的NF-κBp65反义寡核苷酸转染HaCaT细胞反义,可以抑制UV辐射诱导的HaCaT细胞反义产生IL-6,表明UV诱导HaCaT细胞反义产生IL-6可能是通过UV激活NF-κBp65的表达产生的。     

结肠腺癌细胞株eIF-4E对NF-κB表达的影响及诱导凋亡机理的探讨

目的研究真核细胞起始因子(Eukaryotic Initiation Factor 4E,eIF-4E)对NF-κB表达及活性水平的影响,并对其阻滞后诱导肿瘤细胞凋亡的途径进行探讨.方法应用脂质体包裹与eIF-4E mRNA翻译起始点互补的反义寡核苷酸(asODN),处理人大肠腺癌细胞LS-174T.使用Western blot和RT-PCR方法分别检测eIF-4E被阻抑后其转录和翻译水平的改变.EMSA用来比较eIF-4E阻滞前后NF-κB活性的改变.采用流式细胞仪检测LS-174T细胞凋亡.结果eIF-4E被阻抑表达后,NF-κB蛋白表达和活性水平也有显著下降.伴随eIF-4E表达和NF-κB活性水平下降,LS-174T细胞的凋亡率显著升高.结论本试验证明NF-κB受eIF-4E的翻译调控,eIF-4E的抗凋亡作用部分可能是通过调节NF-κB活性来实现的.此结论对于结肠癌试验性和肿瘤临床的基因治疗具有一定意义.     

Cellular pharmacology of P-ethoxy antisense oligonucleotides targeted to Bcl-2 in a follicular lymphoma cell line

A P-ethoxy oligonucleotide (oligo), 20 bases long and specific for the translation initiation site of human Bcl-2 mRNA, was incorporated into liposomes to increase its intracellular delivery. This oligo selectively inhibited Bcl-2 protein expression and induced growth inhibition in t(14;18)-positive transformed follicular lymphoma (FL) cell lines. We studied the inhibitory effects of shorter liposomal P-ethoxy oligos (7, 9, 11 or 15 mer) in order to determine the activity of different oligo chain lengths targeted to the same Bcl-2 mRNA. At 12 μM, all the oligos inhibited the growth of a FL cell line. We compared the 7-mer oligo with the 20-mer oligo. The two oligos inhibited Bcl-2 protein expression similarly: 66% and 60% for the 7- and 20-mer, respectively. The uptake and retention of both oligos were also very similar. Our results indicate that the Bcl-2 inhibitory activity is maintained with P-ethoxy antisense oligos ranging from 7 to 20 bases.     

半乳糖受体介导的c-myc反义核酸对人肝癌细胞

目的 :探讨半乳糖 (Gal) -聚乙烯亚胺 (PEI) -c -myc反义寡核苷酸 (ASODN)交联复合物对人肝癌细胞增殖的影响。方法 :Gal-PEI-ASODN复合物作用于人肝癌Bel- 74 0 2细胞 ,台盼蓝染色法检测不同时间、不同浓度作用下细胞增殖的变化 ,倒置显微镜观察细胞形态 ,流式细胞仪分析细胞亚二倍体的百分率 ,透射电镜观察细胞超微结构的改变。结果 :在 0 - 96h的不同时间点 ,与ASODN组 (含ASODN 2 0 μmol/L)相比 ,Gal-PEI-ASODN复合物 (含ASODN 0 75 μmol/L)明显抑制Bel- 74 0 2细胞的增殖 ,Gal-PEI -ASODN复合物的起效浓度更低 ,起效时间更短 ;不同浓度的单纯ASODN与Bel- 74 0 2细胞作用 72h ,测得ASODN的IC50 为 2 0 9μmol/L ,而在半乳糖受体的介导下 ,ASODN与Bel- 74 0 2细胞作用 4 8h ,测得ASODN的IC50 为 0 2 94 μmol/L ,ASODN的抑制效果提高 70 9倍 ;Gal-PEI -ASODN复合物与Bel- 74 0 2细胞作用 4 8h ,与单纯ASODN组相比 ,细胞亚二倍体百分率更高 ,并且电镜下可见明显的细胞凋亡形态。结论 :半乳糖受体介导的投递系统可明显提高ASODN对Bel- 74 0 2细胞的增殖抑制效应     

反义多重耐药性基因抑制眼睫状体非色素上皮细胞容积激活性氯电流

目的:研究多重耐药性(MDR1)基因及其产物P糖蛋白(P-gp)与容积激活性Cl^-电流的关系。方法:用膜片钳全细胞记录技术记录牛眼睫状体非色素上皮(NPCE)细胞容积激活性Cl^-电流,反义寡核苷酸阻抑细胞MDR1基因表达,在激光共聚焦显微镜下检测细胞P-gp免疫荧光。结果:P-gp免疫荧光与人源反义MDR1呈剂量依赖性减弱关系,容积激活性Cl^-电流被人源反义MDR1特异性地部分阻抑,电流潜伏期延长,峰电流值减少,电流抑制率与人源反义MDR1呈现剂量依赖性增强关系,(r=0.99, P＜0.01)。 P-gp表达抑制率和容积激活性Cl^-电流抑制率高度正相关(r=0.99, P＜0.01)。结论: MDR1基因及其产物P-gp参与NPCE细胞容积激活性Cl^-电流的形成。     

Effect of nuclear factor-κB p65 ASOND on I typ collagen expression and rat hepatic stellate cells proliferation

Objective Sstudy effect of nuclear factor-κB ASOND on I type collagen expression and rat hepatic stellate cells(HSC)proliferation.Methods Rat HSCs were separated by affusing and digestingof Ⅳ type collagenenzyme and density acentric method.Lipid-mediated NF-κB p65 ASOND(0.001,0.01,0.1,1μmol/L)Was transferred into rat HSCs.Toxicity of HSCs caused by NF-κB p65 ASOND and activity of LDH were determined by trypan blue staining.Proliferation affection of transferring NF-κB p65 ASOND into HSCs was determined by MTT.In different concentration NF-κB p65 ASOND.expression of Ⅰ type collagen stimulated by 1mg/L TNF-αwas determined by RT-PCR and ELISA.Results After transfection of NF-κB p65 ASODN,expression of NF-κB protein in HSCs was decreasing.Toxicity experiment indicated that NF-κB p65 ASOND of different concentration(0.001,0.01,0.1 and 1.0 μmol/L)had no effect on HSCs livability and LDH activity(P<0.05).Four different concentration NF-κ B p65 ASOND could restrain HSCs proliferation stimulated by 1 mg/L TNF-α.The expression of I type collagen and mRNA stimulated by 1mg/LTNF-αwas increased,and had a positive correlation with concentration(P>0.05).Conclusion NF-κB p65 ASOND may depress NF-κB activity to restrain HSCs proliferation and Ⅰ type collagen expression,and reduce extracellular matrix.     

Effect of nuclear factor-κB p65 ASOND on I typ collagen expression and rat hepatic stellate cells proliferation

Objective Sstudy effect of nuclear factor-κB ASOND on I type collagen expression and rat hepatic stellate cells(HSC)proliferation.Methods Rat HSCs were separated by affusing and digestingof Ⅳ type collagenenzyme and density acentric method.Lipid-mediated NF-κB p65 ASOND(0.001,0.01,0.1,1μmol/L)Was transferred into rat HSCs.Toxicity of HSCs caused by NF-κB p65 ASOND and activity of LDH were determined by trypan blue staining.Proliferation affection of transferring NF-κB p65 ASOND into HSCs was determined by MTT.In different concentration NF-κB p65 ASOND.expression of Ⅰ type collagen stimulated by 1mg/L TNF-αwas determined by RT-PCR and ELISA.Results After transfection of NF-κB p65 ASODN,expression of NF-κB protein in HSCs was decreasing.Toxicity experiment indicated that NF-κB p65 ASOND of different concentration(0.001,0.01,0.1 and 1.0 μmol/L)had no effect on HSCs livability and LDH activity(P<0.05).Four different concentration NF-κ B p65 ASOND could restrain HSCs proliferation stimulated by 1 mg/L TNF-α.The expression of I type collagen and mRNA stimulated by 1mg/LTNF-αwas increased,and had a positive correlation with concentration(P>0.05).Conclusion NF-κB p65 ASOND may depress NF-κB activity to restrain HSCs proliferation and Ⅰ type collagen expression,and reduce extracellular matrix.     

反义核酸逆转人白血病多药耐药细胞株耐药性的实验研究

目的 采用一段人工合成的互补于多药耐药基因的反义硫代磷酸寡核苷酸转染白血病多药耐药细胞株Ｋ５６２／ＡＤＭ,来逆转白血病细胞的多药耐药。方法 四唑蓝快速比色法检测Ｋ５６２／ＡＤＭ细胞对阿霉素的半数抑制量,流式细胞仪分析细胞内的柔红霉素含量,免疫细胞化学染色方法确定Ｐ１７０的表达水平,逆转录聚合酶链反应检测ｍｄｒ１－ｍＲＮＡ的相对水平。     

反义寡核苷酸抑制肝癌血管内皮生长因子表达

目的 探讨不同序列的反义寡核苷酸对肝癌细胞血管内皮生长因子(VEGF)表达的抑制效果。 方法 SMMC7721细胞于正常氧和缺氧条件下培养24 h,观察缺氧对VEGF mRNA表达的影响;SMMC7721细胞接种于6孔板后,各加入不同的反义寡核苷酸(反帽子结构A06513、反翻译起始部位A06514、反第三外显子A06515、反翻译终止部位A06516和空白组),缺氧培养24 h,然后收集细胞提取总RNA并作逆转录聚合酶链反应分析,同时以管家基因GAPDH(3-磷酸甘油醛脱氢酶)表达为内对照。 结果 缺氧条件下,SMMC7721细胞VEGF mRNA表达明显增强,而有氧条件下未见表达;反义寡核苷酸具有明显抑制VEGF mRNA表达,和空白对照组相比,A06513、A06514、A06515及A06516的VEGF/GAPDH值分别为0.49±0.08、0.71±0.12、0.72±0.11及0.86±0.12(F=12.21,P<0.05)。帽子结构的反义基因表现最强的抑制作用(P<0.0 1)。 结论 与VEGF帽子结构作用的反义寡核苷酸,有望成为肝癌反义基因治疗的新选择。     

抑制金属蛋白酶组织抑制因子-2在肝组织中的表达对大鼠肝纤维化发展的影响

我们前期应用反义寡核苷酸技术，以金属蛋白酶组织抑制因子（TIMP）-1基因为靶基因，研究发现抑制TIMP-1的表达可阻止大鼠肝纤维化的发展。肝纤维化时，肝内增生的胶原蛋白主要为Ⅰ、Ⅲ型胶原，Ⅳ型胶原的增生沉积并不占主要地位，但Ⅳ型胶原过度沉积可使肝血窦毛细血管化，肝血流和结构改变，从而加剧肝脏病变。TIMP-2是肝组织内Ⅳ型胶原酶，即基质金属蛋白酶-2（MMP-2）的主要抑制因子，