人p27kiplcDNA克隆及其对人舌癌细胞系Tca8113细胞生物学作用的研究
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摘要
目的:舌鳞状细胞癌是口腔颌面部最常见的恶性肿瘤之一,它生长快,浸润强,早期常有淋巴结转移,治疗效果不够理想。近年来,随着分子生物学的快速发展,基因治疗在肿瘤治疗中表现出不可估量的作用。
    本实验以体外培养的人舌鳞状细胞癌细胞Tca8113为研究对象。将克隆的人p27kip1基因连接到pcDNA3载体上,通过脂质体介导转染Tca8113细胞。探讨其对人舌癌细胞系Tca8113细胞的生物学作用。
    方法:从正常肝组织中,提取组织中的总RNA。应用RT-PCR将RNA逆转录为cDNA。参照Gene Bank中人p27kip1 cDNA序列,设计2个引物,应用PCR扩增p27kip1 cDNA。将PCR产物行TA克隆进行测序。测序后选择真核表达载体pcDNA3构建重组表达质粒。将pcDNA3-p27kip1和pcDNA3质粒DNA分别用脂质体包裹转染培养细胞,而后通过G418培养液进行筛选,应用PCR法鉴定p27kip1基因转染的Tca8113细胞株。采用流式细胞术检测p27kip1蛋白的表达;凋亡相关蛋白Bcl-2的表达;细胞周期及细胞凋亡。用MTT法检测p27kip1基因转染对Tca8113细胞生长的影响;检测化疗药物对p27kip1基因转染的Tca8113细胞生长的影响。
    结果:
    1.经测序我们所获得的p27kip1cDNA与Gene Bank登录的序列一致为具有完整阅读框架的p27kip1基因。成功地构建了pcDNA3-p27kip1重组表达质粒,pcDNA3-p27kip1重组表达质粒经酶切鉴定正确。筛选出了抗G418阳性细胞克隆,建立二个新的细胞株。分别命名为:转染质粒pcDNA3-p27kip1的细胞株为Tca-P27;转染空载体pcDNA3的细胞株为Tca-P3。应用PCR鉴定,pcDNA3-p27kip1质粒转染的Tca8113细胞基因组DNA出现p27kip1cDNA扩增带,Tca8113细胞和转染空载体pcDNA3的Tca-P3细胞基因组DNA的PCR产物为阴性。证明了pcDNA3-p27kip1质粒成功地转染入Tca8113细胞。
    2.流式细胞术检测p27kip1蛋白的表达结果以p27kip1蛋白表达的阳性细胞百分数表示。Tca-P27细胞p27kip1蛋白表达的阳性细胞百分数明显高于Tca-P3、Tca8113细胞,差异显著(P<0.05)。Tca8113与Tca-P3细胞p27kip1蛋白阳性细胞百分数无显著性差异(P>0.05)。显示转染p27kip1基因的
    
    
    Tca8113细胞获得了p27kip1蛋白的高表达。
    3.MTT法检测Tca8113细胞、Tca-P3细胞、Tca-P27细胞24h(小时)、48h、72h、96h OD值,以OD值代表细胞相对数量,结果Tca-P27细胞增殖速度明显低于Tca8113细胞和Tca-P3细胞。24h、48h,Tca-P27细胞比Tca8113、Tca-P3细胞增殖速度慢,72h、96h时,Tca-P27细胞出现增殖下降。而Tca8113、Tca-P3细胞在24h、48h、72h、96h呈持续增殖状态,三者增殖速度差异显著(P<0.05)。显示转染p27kip1基因后抑制了Tca8113细胞生长。
    4.流式细胞术检测细胞周期 结果Tca-P27细胞G0/G1期占细胞百分数明显高于Tca-P3和Tca8113细胞G0/G1期细胞百分数,显著差异(P<0.05)。Tca-P27细胞出现了G0/G1期阻滞。表明转染外源性p27kip1基因在Tca8113细胞中的高表达抑制了细胞周期向S期过渡,使细胞阻滞于G0/G1期,抑制了细胞的增殖。
    G2/M和S期所占细胞百分数Tca-P27细胞明显低于Tca8113细胞和Tca-P3细胞所占的细胞百分数(P<0.05)。通过计算细胞的增殖指数,Tca-P27细胞增殖指数明显低于Tca-P3细胞和Tca8113细胞的增殖指数。三者增殖指数比较差异显著(P<0.05)。显示了转染外源性p27kip1基因,使Tca8113细胞出现G0/G1期阻滞,细胞增殖下降,抑制了细胞生长。
    5.流式细胞术检测凋亡结果 在G1期前Tca-P27细胞出现了凋亡峰,表明Tca-P27细胞出现了凋亡。Tca8113细胞没有明显凋亡峰出现;Tca-P3细胞也没有明显凋亡峰出现,Tca-P27细胞凋亡指数明显高于Tca8113细胞和Tca-P3细胞的凋亡指数,差异显著(P<0.05)。显示了转染p27kip1基因由于p27kip1基因的高表达,诱导了Tca8113细胞出现了凋亡。
    6.流式细胞术检测Bcl-2蛋白的表达结果以Bcl-2蛋白表达阳性细胞百分数表示,Tca-P27细胞阳性细胞百分数明显低于Tca8113细胞和Tca-P3细胞阳性细胞百分数,差异显著(P<0.05)。Tca8113细胞与Tca-P3细胞阳性细胞百分数比较无显著差异(P>.05)。显示了转染p27kip1基因由于p27kip1基因的高表达,引起了凋亡相关蛋白Bcl-2的表达的下调。Bcl-2是一种抗凋亡蛋白,推测转染外源p27kip1基因诱导了Tca8113细胞的凋亡,可能与Bcl-2蛋白表达下调有关。
    7.用MTT法对8种化疗药作用Tca-P27细胞、Tca-P3细胞、Tca8113细胞,24h、48h测OD值计算化疗药对三组细胞的生长抑制率。结果顺铂、丝裂霉素、氟尿嘧啶对三组细胞都有明显的抑制作用。平阳 霉素对三组细胞有一定的抑制作用,但以上化疗药对三组细胞的抑制率比较无显著差异(P>0.05)均未显示出转染p27kip1基因有提高以上化疗药对Tca8113细胞的生长抑制作用。环磷酰胺、甲氨蝶呤、阿霉素对三组细胞无明显抑制作用。长春新碱对Tca-P27细胞抑制率明显高于Tca8113细胞和Tca-P3细胞,差异显著(P<0.05)。随时间的增加,细胞抑制率增高(P<0.05)。显示出转染p27kip1基因提高了长春新碱对Tca8113细胞的生长抑制作用。长春新碱使
    
    
    转染外源p27kip1基因的Tca8113细胞抑制率增加,推测可能因长春新碱作用于M期及其干扰细胞肌醇磷脂代谢而影响细胞增殖。同
Objective: Tongue squamous cell carcinoma (TSCC) is one of the most common malignancies in oral and maxillofacial region. It grows fast and invades tissues beside soon. It often has lymph nodes transfer in earlier period and has a bad therapeutic efficacy. Recently, with the rapid development of molecular biology, gene therapy exhibits an immeasurable role in tumor therapy.
    Our investigative object is the human TSCC cell Tca8113 that cultured in vitro. We linked cloned human p27Kip1 gene to pcDNA3 vector and transfected it to Tca8113 cells mediated by liposomes. We discussed the biological action of p27Kip1 gene in TSCC cell line Tca8113.
    Methods: Extracts the RNA of the normal liver tissue. Reverse transcription the RNA to cDNA by RT-PCR method. Design the two primers in accordance with the cDNA sequence of p27Kip1 gene in Gene Bank and make PCR to amplify p27Kip1 cDNA. Undertake TA clone with the production of PCR and sequencing. Constructed the recombinated expression plasmid with eukaryon expression vector pcDNA3 after sequencing. Coating the pcDNA3-p27Kip1 and pcDNA3 plasmid DNA with liposomes separately and transfected them to Tca8113 cells. Selected the transfected cell in G418 culture medium and evaluated the Tca8113 cells strain transfected by p27Kip1 gene with PCR. We used flow cytometer to detect the expression of p27Kip1 protein, apoptosis related protein Bcl-2, cell cycle and cell apoptosis. Detected the effects on the growth of Tca8113 cells that transfected by p27Kip1 gene with MTT method. Detected the effects of chemical therapy medicine on the growth of Tca8113 cells transfected by p27Kip1 gene.
    Results:
    1. The sequence of p27Kip1 cDNA that we obtained was confirmed coincide with the sequence of Gene Bank. This result proved that it was the p27Kip1 gene with integrated read framework. We constructed the recombination expression plasmid pcDNA3-p27Kip1 successfully and it was correct after of enzyme cut. We screened positive cell clone that anti-G418 and established two new cell strains that we called them Tca-P27 and Tca-P3. Tca-P27 is the cell strain that transfected
    
    
    by pcDNA3-p27Kip1and Tca-P3 is the cell strain that transfected by empty vector pcDNA3. Evaluated by PCR, the genome DNA of Tca8113 cells transfected by pcDNA3-p27Kip1 plasmid appeared p27Kip1 cDNA amplification strip. The PCR production of genome DNA of Tca8113 cells and Tca-P3 cells transfected empty vector pcDNA3 were negative. This proved the pcDNA3- p27Kip1 plasmid transfected to Tca8113 cells successfully.
    2. We detected the expression of p27Kip1 protein with flow cytometry and registered the results by the percentage of the positive cells that expressed the p27Kip1 protein. The percentage of the positive cells that expressed the p27Kip1 protein in Tca-P27 cells is higher than Tca-P3 cells and Tca8113 cells distinctly and the difference was prominence(P<0.05). There was no prominent difference (P>.05) in the percentage of the positive cells that expressed the p27Kip1 protein in Tca-P3 cells and Tca8113 cells. These results indicated that the Tca8113 cells transfected by p27Kip1 gene obtained the high expression of p27Kip1 protein.
    3. Measure the OD value of Tca8113 cells, Tca-P3 cells and Tca-P27 cells with MTT method at 24 hours, 48 hours, 72 hours and 96 hours. The OD value represents the cell relative number. The results indicated that the proliferative speed of Tca-P27 cells was slower than Tca8113 cells and Tca-P3 cells distinctly. The proliferative speed of Tca-P27 cells was slower than Tca8113 cells and Tca-P3 cells at 24 hours and 48 hours. Tca-P27 cells appeared a state of descending of proliferation at 72 hours and 96 hours. Tca8113 cells and Tca-P3 cells proliferated continually at 24 hours, 48 hours, 72 hours and 96 hours and the difference was prominence(P<0.05)in the speed of proliferation among them. This investigation shown that the growth of Tca8113 cells was inhibited after transfected by p27Kip1 gene and the proliferation of Tca8113 cells presented stasis.
    4. The results of cell cycle detected
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