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牛肌肉衛(wèi)星細(xì)胞向胰島素分泌細(xì)胞的誘導(dǎo)轉(zhuǎn)分化研究

發(fā)布時(shí)間:2018-02-14 12:27

  本文關(guān)鍵詞: 肌肉衛(wèi)星細(xì)胞 定向分化 胰腺細(xì)胞 胰島素分泌 出處:《農(nóng)業(yè)生物技術(shù)學(xué)報(bào)》2016年02期  論文類型:期刊論文


【摘要】:肌肉衛(wèi)星細(xì)胞是源自中胚層的肌源干細(xì)胞,具有增殖分化融合成肌管并形成肌細(xì)胞的能力。在體內(nèi)條件下,肌肉衛(wèi)星細(xì)胞不可能跨胚層分化為內(nèi)胚層來源的胰腺細(xì)胞。本研究從牛(Bos taurus)胎兒肌肉中分離培養(yǎng)得到肌肉衛(wèi)星細(xì)胞,并在體外條件下將其誘導(dǎo)成胰島素分泌細(xì)胞。在誘導(dǎo)過程中,分析了與胰腺發(fā)育相關(guān)的胰十二指腸同源基因盒1基因(pancreatic and duodenal homeobox 1,PDX1)、神經(jīng)原素3基因(neurogenin 3,NGN3)、淀粉酶基因(Amylase)和胰島素基因(Insulin,INS)的動(dòng)態(tài)表達(dá)情況。結(jié)果表明,PDX1作為決定胰腺分化發(fā)育和胰島功能的主要調(diào)節(jié)基因,在誘導(dǎo)分化的第2天能夠檢測到其m RNA的表達(dá),在第3天表達(dá)量達(dá)到了最大,第4天以后維持在較低水平。NGN3是內(nèi)分泌細(xì)胞形成非常重要的轉(zhuǎn)錄因子,是能夠?qū)⒁葝u素分泌到胞外的關(guān)鍵基因,其m RNA在分化誘導(dǎo)的第3天開始表達(dá),第4天達(dá)到最高水平,之后逐漸下降。Amylase是胰腺發(fā)育中細(xì)胞外分泌相關(guān)的基因,Amylase m RNA在第6天才開始表達(dá),8 d后達(dá)到最高。INS m RNA表達(dá)量在11~12 d最高,酶聯(lián)免疫吸附分析(enzyme-linked immunosorbent assay,ELISA)發(fā)現(xiàn),誘導(dǎo)形成的胰腺細(xì)胞能夠正常分泌胰島素,培養(yǎng)液中胰島素的濃度在誘導(dǎo)的11~12 d達(dá)到最高值。向培養(yǎng)液中添加葡萄糖后,可使細(xì)胞的胰島素分泌量顯著提高,說明誘導(dǎo)得到的細(xì)胞類似于成體胰島的功能,其胰島素分泌受外界葡萄糖濃度的調(diào)節(jié)。上述結(jié)果表明,肌肉衛(wèi)星細(xì)胞可以被誘導(dǎo)轉(zhuǎn)分化為胰島素分泌細(xì)胞,并對培養(yǎng)環(huán)境中的葡萄糖刺激做出應(yīng)答反應(yīng)。本研究結(jié)果為進(jìn)一步的研究和臨床應(yīng)用提供基礎(chǔ)資料。
[Abstract]:Muscle satellite cells are myogenic stem cells derived from the mesoderm, which have the ability to proliferate, differentiate, and fuse into muscle tubes and form muscle cells. It is impossible for muscle satellite cells to differentiate into pancreatic cells derived from endoderm. In this study, muscle satellite cells were isolated and cultured from Bos taurus fetal muscles. It was induced into insulin-secreting cells in vitro. The dynamic expression of pancreaticoduodenal homologous gene cassette 1, neurogenin 3 (NGN3), amylase gene (Amylase) and insulin gene insulinine (ins) related to pancreatic development were analyzed. The results showed that PDX1 was the determinant of pancreas. The major regulatory genes for differentiation and development and islet function, The expression of m RNA was detected on the second day of differentiation, and reached the maximum on the third day, and maintained at a low level after 4 days. NGN3 was a very important transcription factor in endocrine cell formation. It is the key gene that can secrete insulin to extracellular, and its m RNA expression begins on the 3rd day of differentiation induction and reaches the highest level on the 4th day. After that, the expression of Amylase m RNA, a gene related to exocrine secretion of pancreatic cells, began to express at the 6th day and reached the highest level at 1112 days after the expression of Amylase m. Enzyme-linked immunosorbent assayayer Elisa revealed that the highest expression level of Amylase m was found by enzyme-linked immunosorbent assayay assay (Elisa) on the 6th day, and then reached the highest level at 1112 days after the expression of Amylase m. The pancreatic cells were able to secrete insulin normally, and the concentration of insulin in the culture medium reached the highest level on the 12th day after induction. After glucose was added to the culture medium, the insulin secretion of the cells increased significantly. These results indicate that the induced cells are similar to the adult islets, and their insulin secretion is regulated by the concentration of external glucose. These results suggest that the muscle satellite cells can be induced to differentiate into insulin-secreting cells. The results provide basic data for further research and clinical application.
【作者單位】: 內(nèi)蒙古大學(xué)哺乳動(dòng)物生殖生物學(xué)與生物技術(shù)教育部重點(diǎn)實(shí)驗(yàn)室;內(nèi)蒙古醫(yī)科大學(xué)基礎(chǔ)醫(yī)學(xué)院生理教研室;
【基金】:內(nèi)蒙古自治區(qū)科技廳重大基礎(chǔ)研究開放課題(No.20130902)
【分類號(hào)】:S852.2

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