反义寡核苷酸阻遏角蛋白14的表达

目的 研究脂质体介导角蛋白K14反义寡核苷酸(ASODN)阻遏人角质形成细胞K14基因和蛋白的表达及抑制体外增殖活性的效果.方法 人表皮角质形成细胞原代培养,3~10代用于实验,利用脂质体将人工合成的正义、反义及错配K14寡核苷酸基因片段导入角质形成细胞,应用流式细胞仪、逆转录聚合酶链反应(RT-PCR)和免疫组化(SABC)方法检测反义寡核苷酸对角质形成细胞的细胞周期、K14基因和蛋白表达的影响.结果 脂质体介导的K14反义寡核苷酸转染角质形成细胞后,能有效地抑制角质形成细胞中K14基因的表达;48h后可阻遏K14蛋白表达;流式细胞仪检测见反义寡核苷酸处理组细胞周期发生明显改变,G₁期细胞百分率上升,S期细胞百分率下降.而正义寡核苷酸1组、错义寡核苷酸组及空白对照组均无此变化.结论 应用反义技术封闭K14基因,可以阻遏角蛋白K14基因和蛋白的表达,并可以抑制体外培养的角质形成细胞的增殖.     

皮肤科学基础

20042639　角蛋白K14反义寡核苷酸对角质形成细胞增殖的影响/陈玉欣(四军大西京医院全军皮肤性病中心)…//临床皮肤科杂志.-2004,33(5).-263～265采用脂质体将人工合成的正义、反义及错配寡核苷酸基因片段导入体外培养的角质形成细胞,应用细胞生长抑制实验、透射电镜和流式细胞仪分别检测反义寡核苷酸对角质形成细胞的增殖、超微结构和细胞增殖周期的影响。结果显示,脂质体介导的K14反义寡核苷酸对角质形成细胞的增殖活性有明显抑制作用;电镜下见角质形成细胞中角蛋白合成明显减少;流式细胞仪检测见细胞周期发生明显改变,G1期细胞百分率上…     

皮肤科学基础

20 0 4 196 7　反义寡核苷酸阻遏角蛋白 14的表达 /陈玉欣 (四军大西京医院皮肤科 )… / /中华皮肤科学杂志 .-2 0 0 4 ,37( 4) .- 2 2 4～ 2 2 6人表皮角质形成细胞原代培养 ,利用脂质体将人工合成的正义、反义及错配 K14寡核苷酸基因片段导入角质形成细胞 ,应用流式细胞仪、逆转录聚合酶链反应 ( RT- PCR)和免疫组化 ( SABC)法检测反义寡核苷酸对角质形成细胞的细胞周期、K14基因和蛋白表达的影响。结果显示 ,应用反义技术封闭K14基因 ,可以阻遏角蛋白K14基因和蛋白的表达 ,并可以抑制体外培养的角质形成细胞的增殖。提示以 K14为靶…     

K17反义寡核苷酸对角质形成细胞增殖和K17表达的影响

目的研究脂质体介导角蛋白17(K17)反义寡核苷酸对培养人角质形成细胞增殖和K17表达的影响。方法利用脂质体将人工合成的正义、反义及错配K17寡核苷酸基因片段导入体外培养的人角质形成细胞系HaCaT,应用MTT法检测其对HaCaT细胞增殖的影响,以逆转录聚合酶链反应(RT-PCR)检测K17mRNA水平的变化,并以蛋白质印迹法、免疫荧光细胞化学结合激光扫描共聚焦显微镜检测K17蛋白水平的改变。结果脂质体介导的K17反义寡核苷酸转染HaCaT细胞后,细胞增殖受到明显抑制,同时细胞中K17mRNA和蛋白的表达明显下降,而正义寡核苷酸组、错义寡核苷酸组及空白对照组均无明显变化。结论应用反义技术封闭K17基因,可以阻遏角蛋白K17基因和蛋白的表达,抑制角质形成细胞的体外生长和增殖能力。     

存活素反义寡核苷酸对角质形成细胞增殖和凋亡的影响

目的探讨存活素反义寡核苷酸对角质形成细胞增殖和凋亡的影响。方法以脂质体介导存活素反义寡核苷酸转染体外培养的角质形成细胞。采用MTT方法观察存活素反义寡核苷酸对角质形成细胞生长曲线的影响;采用RT-PCR方法观察存活素反义寡核苷酸对角质形成细胞存活素表达水平的影响;采用流式细胞仪检测存活素反义寡核苷酸对角质形成细胞细胞周期和凋亡的影响。结果存活素反义寡核苷酸作用于角质形成细胞后,细胞增殖受到明显抑制,存活素mRNA表达水平明显下降,细胞出现明显的凋亡现象。结论存活素反义寡核苷核酸能够抑制角质形成细胞增殖,促进角质形成细胞凋亡。提示存活素可能会成为一个新的治疗银屑病的靶分子。     

靶向角蛋白17基因的小干涉RNA对角质形成细胞增生与凋亡的影响

目的利用RNA干涉技术诱导角蛋白17(K17)基因沉默,观察其对角质形成细胞(KC)增生和凋亡等生物学活性的影响。方法合成两条含有针对人K17mRNA序列的正义和反义寡核苷酸,退火后与表达载体psilencer3.1-H1neo相连接,经鉴定后转染人角质形成细胞系HaCaT,分别以逆转录聚合酶链反应(RT-PCR)和免疫印迹法(W est-ern b lot)检测转染细胞K17 mRNA与蛋白水平的改变,用流式细胞仪检测转染细胞的细胞周期及凋亡情况,并通过透射电镜观察细胞的凋亡。结果成功构建了靶向人K17基因的siRNA表达载体psilencer3.1/K17,检测到瞬时转染的HaCaT细胞中K17的蛋白水平及mRNA水平均明显下降。流式细胞仪检测表明转染细胞的细胞周期发生了明显的G1期阻滞并证实凋亡的存在,电镜下观察到凋亡小体。结论对于增生活跃的角质形成细胞,K17的表达对其增生、分化和凋亡等生物学活性具有重要影响。靶向K17的siRNA能够抑制角质形成细胞增生,诱导其凋亡。     

C-myc反义寡核苷酸抗恶性黑素瘤作用机制初探

目的　初步探讨C-myc反义寡核苷酸(ASODN)抗恶性黑素瘤可能作用机制。方法　以全硫代修饰的C myc反义寡核苷酸体外转染恶性黑素瘤细胞株A375,用台盼蓝活细胞计数法检测其对细胞增殖的影响,流式细胞仪检测细胞周期变化,间接免疫荧光流式细胞术检测HLA Ⅰ抗原的水平。结果　与对照组相比,①30μmol/LASODN组细胞生长明显受抑制,且发生G1 期阻滞;②ASODN组细胞上HLA Ⅰ抗原的水平明显上调。结论　C myc反义寡核苷酸可能通过抑制A375M细胞的增殖和上调HLA Ⅰ抗原水平的双重机制发挥抗肿瘤作用。     

反义p53寡核苷酸对阿霉素诱导的培养人皮肤角质形成细胞凋亡的影响

目的 探讨反义p53寡核苷酸(ODN)对阿霉素诱导的培养人皮肤角质形成细胞凋亡的影响.方法 用MTT法检测不同浓度脂质体和0.5mg/L反义p53 ODN转染角质形成细胞后对2mg/L阿霉素抑制细胞增殖的影响;RT-PCR方法 测定p53 mRNA水平的变化;用流式细胞仪检测细胞凋亡.结果 阿霉素抑制体外培养的人皮肤角...     

角蛋白17反义寡核苷酸对银屑病SCID小鼠模型的作用

目的 建立重症联合免疫缺陷(SCID)小鼠银屑病动物模型,观察角蛋白17(K17)反义寡核苷酸(ASODN)对银屑病动物模型的作用.方法 将斑块状银屑病患者的皮损移植于SCID小鼠,构建银屑病SCID小鼠模型.然后分别以脂质体介导的K17 ASODN、正义寡核苷酸(SODN)及单纯乳剂基质作用于皮损,大体及H-E染色观察皮损改变,RT-PCR以及免疫组化检测K17的变化.结果 成功构建了SCID小鼠银屑病动物模型:与SODN组及单纯乳剂基质对照组相比,K17 ASODN治疗组皮损炎症恢复明显加快,组织学评分显著降低(P<0.01),K17 mRNA水平以及蛋白表达水平也均有不同程度降低.结论 K17 ASODN能够显著改善SCID鼠移植模型的银屑病病理改变,有望成为一种新的治疗措施.     

角质形成细胞生长因子及其受体反义寡核苷酸对HaCaT细胞的影响

目的研究角质形成细胞生长因子(KGF)及其受体(KGFR)反义寡核苷酸对KGF介导的细胞周期和凋亡变化的抑制作用。方法利用永生化角质形成细胞株-HaCaT细胞进行体外培养,流式细胞仪检测KGF引起的HaCaT细胞细胞周期和凋亡变化以及KGFR mRNA反义寡核苷酸对KGF的抑制作用。结果 10ng/mL KGF刺激24 h后可使S期比率较自然生长组增加15%(P＜0．05),并伴凋亡增加2．9%(P＜0．01)。针对KGFR mRNA不同位点的2个序列反义寡核苷酸作用后,S期比率和凋亡率降低,且抑制作用呈浓度依赖性(P均＜0．05)。反义寡核苷酸作用后G_0G_1期相应增加,也呈浓度依赖性(P＜0．01)。各实验组G_2M期比率差异无统计学意义(P均＞0．05)。结论 KGF可能是造成银屑病KC增殖和凋亡的诱因。KGFR mRNA反义寡核苷酸对KGF介导的HaCaT细胞增殖、凋亡增加具有抑制作用。     

Kinesin participates in melanosomal movement along melanocyte dendrites

Movement of melanosomes along melanocyte dendrites is necessary for the transfer of melanin pigment from melanocytes to basal and suprabasal keratinocytes, an event critical to epidermal photoprotection and maintenance of normal skin color. Recent murine data suggest that in melanocyte dendrites the microtubule-associated melanosome movement is bidirectional and that actin-associated myosin V secures the peripheral melanosomes, preparing them to be transferred to surrounding keratinocytes. We now report that human melanocytes express high levels of kinesin, a molecule that participates in microtubule-associated transport of organelles in other cell types, and that ultrastructurally kinesin molecules are closely associated with melanosomes. To determine whether kinesin participates in melanosomal transport, cultured melanocytes were treated with sense or antisense oligonucleotides complementary to kinesin heavy chain sequences. Antisense oligonucleotides decreased kinesin protein levels and inhibited the bidirectional movement of the melanosomes, promoting their backward movement. Furthermore, guinea pigs were exposed to ultraviolet B irradiation, known to enhance transport of melanosomes from melanocytes to epidermal keratinocytes, and then were treated with kinesin sense or antisense oligonucleotides. The areas that were treated with kinesin antisense oligonucleotides showed significantly less pigmentation clinically and histologically than control (sense) oligonucleotide-treated areas. As observed ultrastructurally, in antisense-treated areas melanosomes remained in melanocyte dendrites but over several days were not transferred to the surrounding keratinocytes. Our study supports a major role for kinesin in microtubule-associated anterograde melanosomal transport in human melanocyte dendrites.     

Flow cytometric and microscopic characterization of the uptake and distribution of phosphorothioate oligonucleotides in human keratinocytes

Gene-specific inhibition by antisense oligonucleotides has been successful in a large number of systems. In an attempt to use this strategy for the modulation of skin disease-specific gene expression, we studied oligonucleotide uptake in cultured human keratinocytes. This study revealed a heterogeneous uptake of fluorescently labeled phosphorothioate oligonucleotides. Flow cytometric and microscopic analysis showed two fluorescent cell populations with differences in intensity: a ‘bright’ population of highly fluorescent small cells and a ‘dim’ population of less fluorescent but larger cells. The heterogeneity in uptake between these two populations was not a result of differences in cell cycle phases of the keratinocytes, as shown by flow cytometric sorting and measurements of relative DNA content. In both populations the oligonucleotides were transported intracellularly and were mainly located in the cytoplasm. A typically speckled localization pattern was demonstrated by confocal laser scanning microscopy. We used propidium iodide (PI) to assess viability, and showed that in nonviable (PI-permeable) keratinocytes the oligonucleotides accumulated in the nucleus. The use of a lipidfection reagent also changed the intracellular distribution of oligonucleotides from a punctate cytoplasmic pattern to an intense nuclear localization. The process of uptake by the viable keratinocytes was dependent on oligonucleotide concentration, incubation time and temperature. This study underlines the importance of kinetic studies on oligonucleotide uptake in human keratinocytes which must be considered when specific oligonucleotides are used against skin disease-specific genes. Received: 14 May 1997     

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。     

反义蛋白激酶Cζ对角质形成细胞增殖的影响

目的 研究蛋白激酶C(PKC)ζ亚类在角质形成细胞增殖中的作用.方法 采用基因转染的方法将PKCζ基因导入角质形成细胞株Colo16中,初步研究了表达反义PKCζ对Colo16角质形成细胞增殖的影响.结果 表达反义PKCζ的角质形成细胞形态发生改变,生长速率明显减慢,被阻抑在G1期.结论 反义PKCζ抑制Colo16角质形成细胞的增殖.     

COX-2反义寡核苷酸对Colo-16细胞生长及c-myc基因表达的影响

目的探讨脂质体介导环氧合酶(COX)-2反义寡核苷酸(antisense oligodeoxynucleotide,AsODN)对皮肤鳞状细胞癌细胞株Colo-16细胞生长及对c-myc表达的影响。方法将COX-2无义(Nonsense oligodeoxynucleotide,NsODN)、反义寡核苷酸用脂质体分别导入Colo-16细胞中。四甲基偶氮唑蓝(MTT)法观察COX-2反义寡核苷酸对Colo-16细胞体生长曲线的影响;Hoechst33258荧光染色法观察细胞凋亡的形态学变化;蛋白免疫印迹法(Western blot)检测c-myc蛋白表达的变化。结果COX-2反义寡核苷酸作用于Colo-16细胞后,细胞增殖能力受到抑制,荧光染色可见细胞核染色质边集、固缩、核碎裂的凋亡形态学改变;c-myc表达明显下调。结论COX-2反义寡核苷核酸能够抑制Colo-16细胞体外增殖,诱导Colo-16细胞凋亡,并能显著下调c-myc表达。