本文選題：小鼠 + 肝臟干細胞　； 參考：《復旦大學》2008年博士論文

【摘要】： 目的 研究正常成體小鼠肝細胞的增殖能力和分化潛能,分離正常成體小鼠肝臟內可能存在的干細胞或祖細胞并建立體外培養的細胞模型,研究其基本的生物學特性。 方法 應用改良的Seglen二步法灌注和離心分離肝臟細胞,將肝細胞初步分為肝臟實質細胞(parenchymal hepatocytes,PH)部分和富含AHPC(adult hepaticprogenitor cells,AHPC)部分,對兩部分的細胞用添加胎牛血清(FBS)的改良DMEM培養基進行培養,持續觀察超過60天,分析兩部分中肝細胞的形態學差異,以及通過細胞增殖和克隆的形成情況分析兩部分中肝細胞增殖能力的差異。應用免疫熒光技術對具有高增殖能力細胞及其形成的克隆進行Albumin、AFP、CK19、c-kit、CD45、CD34、Oct-4、Desmin、CD16、Thy-1和nestin等染色,分析細胞標記物的表達和克隆內細胞的成熟分化情況。利用形態學觀察、記錄細胞增殖狀況,以及免疫熒光染色技術初步分析肝臟非實質細胞(nonparenchymalcell,NPC)的生長對于AHPC活化、增殖和分化的影響。另外,嘗試了AHPC克隆的傳代培養。 結果 本研究中兩部分肝細胞均獲得較高的產量和活性(＞90%),完全滿足實驗的需要。PH部分和富含AHPC部分的肝細胞大小分別為(37.03±6.65)μm和(22.63±2.04)μm,存在明顯的統計學差異(p＜0.05),但在大小分布比例上存在小部分的重疊。兩部分的貼壁細胞中均含有NPC污染,其中富含AHPC部分較多,占貼壁細胞總數的70.3%,NPC增殖后肝細胞活化并開始增殖,所有的肝細胞克隆均表達肝星狀細胞標記物Desmin。富含AHPC部分的肝細胞增殖能力明顯較PH部分高,兩部分的克隆形成率分別為21.45%±1.25%和0.28%±0.09%(p＜0.001)。富含AHPC部分中,約13.5%的貼壁肝細胞在接種后第2～3天活化并迅速增殖,第4～5天形成小的細胞克隆,極少數細胞(0.5%～1%)在接種后第3天即可形成克隆;培養30天后克隆內出現類似成熟的肝細胞,細胞克隆可持續擴增超過60天,最大克隆面積達到0.64mm~2,細胞平均增殖超過10個周期。貼壁后24小時,所有的肝細胞均強陽性表達肝細胞標記物Albumin,不表達AFP和CK19,培養第5天細胞克隆開始表達Albumin和AFP,第30天克履誆糠窒赴鉤澩锏ü芟赴鉤曇俏榬K19,同時發現Albumin陰性細胞。通過免疫熒光雙染發現,培養第30天,AHPC克隆內同時存在Albumin陽性和AFP陽性、Albumin陽性和AFP陰性、Albumin陽性和CK19陰性、CK19陽性和AFP陰性、CK19陽性和AFP陽性的細胞。另外,AHPC可以傳代培養超過60天,傳代培養中,貼壁的AHPC克隆內細胞較小,核漿比率大,呈上皮樣細胞的形態,部分細胞仍然具有獨立形成克隆的能力,但觀察發現,AHPC克隆解離為細胞團進行傳代培養中細胞的增殖比解離為單細胞傳代好。 結論 1.在正常成體小鼠肝臟內存在一種肝臟組織特異性的成體肝臟祖細胞(AHPC),并已成功建立了體外培養的細胞模型。 2.小鼠AHPC體外培養活化后可持續克隆性增殖超過60天,并可連續傳代培養,具有向肝細胞和膽管細胞分化的雙向分化潛能。 3.肝臟非實質細胞(NPC)的生長可以促進AHPC的增殖、成熟和分化。 4.與國外文獻報導的肝臟祖細胞相比,小鼠AHPC體外培養中細胞表型不同,具有較高的增殖能力和明顯的雙向分化潛能,為肝細胞移植、肝臟發育和肝病等研究提供了一種新的肝臟干細胞模型和研究工具。
[Abstract]:objective
To study the proliferation and differentiation potential of normal adult mouse hepatocytes, to isolate the possible stem cells or progenitor cells in normal adult mice and to establish a cell model in vitro, and to study their basic biological characteristics.
Method
Liver cells were separated by improved Seglen two step method and centrifugation, and hepatocytes were preliminarily divided into liver parenchyma cells (parenchymal hepatocytes, PH) and AHPC (adult hepaticprogenitor cells, AHPC). The two parts of the cells were cultured with a modified DMEM medium adding fetal bovine serum (FBS), and continued to observe more than 60. Analysis of the morphological differences in the two parts of the liver, and analysis of the difference in the proliferation of hepatocytes in the two part by cell proliferation and cloning. Immunofluorescence technique was used to carry out Albumin, AFP, CK19, c-kit, CD45, CD34, Oct-4, Desmin, CD16, Thy-1 and nestin in the Clones of high proliferative cells and their formation. Color, analysis of the expression of cell markers and the maturation and differentiation of cells in clones. The effects of the growth of nonparenchymalcell (NPC) on the activation, proliferation and differentiation of AHPC were preliminarily analyzed by morphological observation, and the immunofluorescence staining technique was used to analyze the proliferation and differentiation of non parenchymal cells in the liver. In addition, the transmission of AHPC clones was tried. Raise.
Result
In the two parts of this study, the two parts of the liver cells obtained high yield and activity (> 90%). They fully met the needs of the experiment and the size of the liver cells rich in the AHPC part were (37.03 + 6.65) m and (22.63 + 2.04) m respectively. There was a significant statistical difference (P < 0.05), but there was a small overlap in the proportion of the size distribution. The two part of the paste was attached. The parietal cells contained NPC pollution, which were rich in AHPC and accounted for 70.3% of the total number of adherent cells. After NPC proliferation, hepatocytes were activated and began to proliferate. All the hepatocyte clones expressed the hepatic stellate cell marker Desmin. rich in AHPC part of the hepatocytes, which was higher than that of PH, and the clone formation rate of the two parts was 21.45, respectively. % + 1.25% and 0.28% + 0.09% (P < 0.001). In the rich AHPC part, about 13.5% of the adherent hepatocytes were activated and proliferated at second to 3 days after inoculation, and small cell clones were formed on fourth to 5 days, and a few cells (0.5% ~ 1%) could form clones in 1.25% days after inoculation, and there were similar mature hepatocytes in clones and clones could be cloned after 30 days. For more than 60 days, the maximum clone area reached 0.64mm~2, and the cell proliferation was more than 10 cycles. After 24 hours of adherence, all liver cells strongly positive expression of liver cell marker Albumin, not AFP and CK19, and the cell clone began to express Albumin and AFP for fifth days. The thirtieth days of the thirtieth days At the same time, Albumin negative cells were found. By immunofluorescence double staining, it was found for thirtieth days that there were Albumin positive and AFP positive in AHPC clones, Albumin positive and AFP negative, Albumin positive and CK19 negative, CK19 positive and AFP negative, CK19 positive and AFP positive cells. The cells of the AHPC clones in the wall were small, the ratio of the nuclear plasma was large and the morphology of the epithelioid cells. Some cells still had the ability to form clones independently. However, it was found that the proliferation of AHPC clones in the subculture of cell groups was better than that of single cell subculture.
conclusion
1. in the liver of normal adult mice, a liver specific adult liver progenitor cell (AHPC) was established, and a cell model was established successfully in vitro.
2. the mouse AHPC was cultured and activated in vitro for more than 60 days, and could be cultured continuously, with the differentiation potential of hepatocyte and bile duct.
3. the growth of hepatic non parenchymal cells (NPC) can promote the proliferation, maturation and differentiation of AHPC.
4. compared with the liver progenitor cells reported in foreign literature, the cell phenotype of mouse AHPC in vitro is different. It has high proliferation ability and obvious bidirectional differentiation potential. It provides a new liver stem cell model and research tool for liver transplantation, liver development and liver disease.
【學位授予單位】：復旦大學
【學位級別】：博士
【學位授予年份】：2008
【分類號】：R329

【參考文獻】

相關期刊論文 前1條

1 宋陸軍,秦新裕,牛偉新,沈坤堂,劉鳳林,K.A.Andreoni,D.A.Gerber ,J.H.Fair,L.Rice,A.Pleasant,J.Wang;源于體外培養胰島中表達Ngn3的細胞是胰腺內分泌前體細胞的新證據[J];中華外科雜志;2005年01期

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本文編號：2018180