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北京油鸡胚胎肝脏来源间充质干细胞的分离培养及生物学特性研究
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摘要
干细胞研究是生命科学研究领域的热点之一,很多研究成果已应用于临床实践中。本研究以中国特有的地方优良家禽品种北京油鸡为研究对象,对7d鸡胚胎肝组织中的间充质干细胞(MSCs)进行体外分离培养,在优化的体外培养环境中细胞传至25代,冻存156支细胞,应用免疫荧光和RT-PCR技术分别对分离传代细胞进行鉴定,并对传代细胞的冻存和复苏进行探讨是否可以通过干细胞冻存保存北京油鸡这一珍贵遗传资源;对分离鉴定的MSCs通过不同的培养条件进行诱导,分别向脂肪细胞、成骨细胞、神经元和心肌细胞进行分化,应用免疫荧光和RT-PCR对诱导分化细胞进行鉴定。
     结果表明:
     (1)体外环境下能够分离培养北京油鸡胎肝来源的间充质干细胞,分离细胞经过多次传代培养后仍然具有干细胞所特有的增殖和分化潜能,细胞的各项特性符合间充质干细胞的标准。
     (2)在优化组(含10%FBS、5ng/mL bFGF DMEM/F12培养基)的培养体系下,鸡胎肝MSCs体外培养生长旺盛,呈现典型的成纤维细胞形态,绝大多数细胞呈长梭状或三角形或不规则形,细胞排列成漩涡状或火焰状,随着体外培养过程中细胞传代次数的增加,细胞形态趋向均一,且低代次细胞增殖较快,高代次细胞生长明显减慢,随传代次数增多老化细胞增加。
     (3)免疫荧光细胞化学检测显示不同代次鸡胎肝MSCs的表面标志CD29和CD44均成阳性表达,而CK19和CD34均不表达。RNA转录水平RT-PCR检测鉴定各代次MSCs表面标志CD44、CD29、CD71和CD73均成阳性表达,且灰度分析显示除了CD73的表达量随细胞代次的增加而减弱外,其他标志物的表达量差别不显著。分离培养得到的细胞为间充质干细胞,MSCs在体外传代培养后仍能维持MSCs的特性。
     (4)鸡胎肝MSCs随着传代次数的增加,细胞的冻存及复苏活率呈下降趋势,不同代次鸡胎肝MSCs的细胞生长曲线呈经典的“S”型,细胞倍增均历经潜伏期、对数生长期以及生长停滞期。培养的低代次鸡胎肝MSCs中所含S期细胞较高,G0/G1期细胞较低,随细胞传代次数的升高G0/G1期比例随之增高,S期细胞显著下降。冷冻复苏细胞培养符合体外细胞培养的生长规律。
     (5)鸡胎肝MSCs在一定的培养条件下不同代次的细胞均能够分别向脂肪细胞、成骨细胞、神经元和心肌细胞进行分化,且分化后的细胞在形态上发生了相应的变化,少部分细胞出现死亡;随着细胞代次的增高细胞的分化能力减弱,高代次分化后的细胞老化明显;实验分别通过相对应染色方法对分化后细胞进行了物理检测检验分化效果,并通过RT-PCR进一步检测了PPAR-γ、LPL,Collage typeⅠ、Osteopontin,Nestin、NF和Desmin、MyoD1这四种细胞各两种标志物,并分析了分化的目的细胞标志物的表达量变化规律,证明高代次的细胞相较于低代次的细胞分化细胞标志物均出现表达量下调的趋势,说明低代次的细胞在体外更易被诱导分化,细胞随传代次数的增加,细胞的分化能力在减弱。实验证明由7d鸡胚胎肝所分离的MSCs为多潜能间充质干类型的干细胞。
     研究表明:本研究从北京油鸡胚胎肝脏所分离得到的间充质干细胞符合间充质干细胞的生物学特性,细胞在体外培养的环境中最多传代达25代,液氮保存的细胞在复苏后可传代培养并保持鸡胎肝MSCs的生物学特性。鸡MSCs能在体外诱导分化为脂肪细胞、成骨细胞、神经元和心肌细胞。本研究初步建立了鸡胎肝MSCs分离培养及鉴定的方法及试验流程。
Stem cell research is one of hotspots in the field of life science research, there are a lotof research achievements applied in clinical practice.This study by Chinses unique localpoultry breed Beijing fatty chicken as the research object. Mesenchymal stem cells fromliver tissue of7d old chicken embryo were separated and incubated in vitro and cultured inoptimized virto environment to25generations, cryopreserved156Beijing fatty chickenMSCs. Immunofluorescence and RT-PCR identified separation passage cells and passagedcell cryopreservation and recovery in order to explore the possibility of this preciousgenetic resources Cells were stored Beijing fatty chicken; cells induced by different cultureconditions, differentiation respectively into adipose cells,bone cells, nerve cells, andmyocardial cells, immunofluorescence and RT-PCR induced differentiation of cells wereidentified.
     The results prove that:
     (1)Mesenchymal stem cells from liver tissue of chicken embryo still showedproliferation and differentiation potential;the characteristics of cells meet the standard ofmesenchymal stem cells;which isolated cells were mesenchymal stem cells originated fromliver of Beijing fatty chicken embryo.
     (2)Chicken fetal liver MSCs cultured in vitro performed vigorous growth under10%FBS,5ng/mL bFGF and DMEM/F12culture system after comparison andoptimization, which performed typical fibroblast appearance. Majority of the MSCsdisplayed long fusiform or irregular triangles form; cells were arranged in swirling orflame-shaped, With the increase of in vitro culture cell number of batches. cell morphologytend to consistent, low generation cell proliferation faster, high generation cell growthslowed significantly, with the number of batches senescent cells increased.
     (3)Immunofluorescence cytochemistry detected surface markers of differentgenerations chicken fetal liver MSCs CD29and CD44were positive expressed, was notexpressed CK19and CD34. RT-PCR detection and identification on different generations’MSCs surface markers on RNA transcript levels for CD44, CD29, CD71and CD73wereall showed positive expression. Grayscale analysis showed that except from weakenedexpression quantity in CD73as generation increase, the expression levels in other markersdid not differ significantly. Isolated cells were mesenchymal stem cells, which were able to maintain the original characteristics.
     (4)As the increasing of generation, MSCs from chicken fetal liver showeddownward trend of cell cryopreservation and resuscitation survival rate. Differentgenerations of chicken fetal liver MSCs displayed classical "S" shape, cell multiplicationexperienced incubation period, logarithmic growth period and growth stagnation period.The cultured low generation chicken fetal liver MSCs contained higher number of S-phasecells, and lower number of G0/G1phase cells. As generation increase the G0/G1phase cellsproportion increased and number of S-phase cells significantly decreased. Thawed cellscultured in vitro in line with the growth pattern of the cell culture in vitro.
     (5)Chicken fetal liver MSCs in different generations of cells under certain cultureconditions are able to differentiate to adipocytes, osteoblasts, nerve cells and myocardialcells, followed by some morphology changes and death of small part of cells. However,cell differentiation capacity diminished as generation increase and differentiated cells fromhigh-generation were aging significantly. In the experiment, differentiated cells werephysical detected for testing the differentiation effects through corresponding stainingmethods, followed by test on PPAR-γ、LPL, Collage typeⅠ、Osteopontin, Nestin、NF andDesmin、MyoD1four cell markers through RT-PCR, each includes two types respectively.Furthermore, analysis was done on changing rule of, so as to prove the high generationcells showed downward trend of expression level,compared to low generation cells. It isindicating that low generation cells are more easily induced to differentiate in vitro, celldifferentiation ability is weakened as generation increase. The experiment proved thatMSCs isolated from7d chicken embryonic liver are pluripotent MSCs.
     Research showed that MSCs isolated from Beijing fatty chicken embryo liveraccordance with biological characteristics of MSCs. The cells cultured in vitro are able topass on up to25generations at most; cells preserved in liquid nitrogen are able to besubcultured and maintain biological characteristics of MSCs after recovery. Chicken MSCscan be induced and differentiated to adipocytes, osteoblasts, nerve cells and myocardialcells. In this study, isolation and identification methods and experiment processes of thechicken fetal liver MSCs are initially established.
引文
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