长江江豚脐带永生化成纤维细胞系建立及细胞生长特性研究

IMMORTALIZATION OF YANGTZE FINLESS PORPOISE FIBROBLAST CELL AND PRELIMINARY STUDY ON THE GROWTH CHARACTERISTICS

  • 摘要: 取长江江豚(Neophocaena phocaenoids asiaeorientalis)产后胎盘脐静脉, 经组织块培养, 差异贴壁法纯化, 构建长江江豚的原代细胞系; 经外源癌基因SV40 T antigens(猿猴病毒T抗原)转染构建稳定脐带细胞系, 并对长江江豚的永生化后的成纤维细胞的细胞形态、转染效率、生长曲线和活率等进行探究。结果表明: (1)原代脐静脉细胞大约14d从组织边缘分离, 20d形成单层, 细胞呈现典型的成纤维细胞状, 梭形、不规则星行或多边形。原代细胞传代14代后出现老化和凋亡。(2)通过SV40 T antigens转染构建的细胞系可传代40—50次, 证实转染SV40 T antigens后可增加细胞的增殖能力。(3)不同世代永生化的成纤维细胞复苏前后细胞活性并无明显差异, 复苏细胞活性在90%以上, 表明永生化后的细胞可以稳定保存。利用CCK-8法测得细胞的生长曲线呈现“S”型。(4)对永生化的细胞系进行后续基因表达尝试, 通过转染外源基因绿色和红色荧光蛋白, 转染外来质粒效率约为15%, 说明外源基因可以表达, 并能被成功检测。研究构建长江江豚的脐静脉来源的永生化后细胞系, 为江豚的其他组织细胞系建立以及江豚细胞库的建立提供基础, 成功对永生化后的细胞系进行外源基因的转染, 为以后深入长江江豚相关基因和分子机制研究打下基础。

     

    Abstract: The Yangtze finless porpoise (Neophocaena phocaenoides asiaeorientalis) is the sole freshwater subspecies of N. phocaenoides. As a mammalian species at the top of the food chain, it has been described as sentinels for the health of the Yangtze River ecosystem. Obtaining stable Yangtze River cell lines from fresh tissue is technically and legally difficult. In this study, we successfully established a finite cell line which deprived from placenta umbilical vein of the Yangtze finless porpoise, and an infinite cell line through transfection (simian virus 40 T antigens) techniques. The morphology, transfection efficiency, dynamic growth, and survival rate of the infinite cultured cells were extensively studied. The present study shows that prior direct establishment from fresh tissue leads to more efficient cell line establishment compared with enzymatic dissociation. Primary culture cells were isolated from the edge of the tissue for almost 14 days, cultured at 37℃ and 5% CO2 in the standard mammalian medium DMEM supplemented with 10% fetal bovine serum (FBS), and monolayers were observed in 20 days. Cells were verified as fibroblasts based on their spindle-shaped morphology. After a limited number (less than 14) of transmissions, the primary fibroblast proliferation ceases to occur. Following the transfection of Yangtze finless porpoise primary fibroblasts with a plasmid encoding, the SV40 large T-antigens and the transfected cells were isolated and expanded. The cell line can propagat 40-50 times. We used PCR to amply the expression of SV40 Large T antigens. Population doubling time was about 24h and cells were successfully cryopreserved and thawed. Furthermore, we identified no significant difference in cell viability between different generations of immortalized fibroblasts before and after resuscitation with trypan blue staining. By transfecting the exogenous plasmid pEGFP-C1 and pERed2-N1, the efficiency of transfection of the foreign plasmid was about 15%, indicating that the exogenous gene can be expressed. The cell line of Yangtze finless porpoise is hard to be transfected using plasmid. In conclusion, we established a stable Yangtze finless porpoise cell line for the first time without hurting any Yangtze finless porpoise, and this cell line shares important features of the immortalized cell lines. Future research will focus not only on toxicity aspects but also on the development of immortalized Yangtze finless porpoise cell lines to enable long-term maintenance and application. Importantly, we provided a protocol for establishing a stable cell line for Yangzte finless porpoise so that we can explore the function of genes and molecular mechanisms related to Yangtze finless porpoise. The establishment of this stable cell line allows a wealth of functional studies on the unique mechanism of Yangtze finless porpoises, which can make it possible to optimizes advanced technology applications on the field of wild aquatic animals in protection.

     

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