長期培養(yǎng)人臍帶間充質(zhì)干細胞活性及基因表達變化研究
發(fā)布時間:2019-03-19 20:37
【摘要】:目的:探討體外長期培養(yǎng)人臍帶間充質(zhì)干細胞(human umbilical cord-MSCs, hUC-MSCs)生物活性變化特點及分子機制,為提高MSCs體外長期培養(yǎng)的質(zhì)量與穩(wěn)定性提供實驗資料。 方法:無菌收集剖宮產(chǎn)新生兒臍帶,經(jīng)膠原酶Ⅱ消化,分離細胞。采用粘附生長選擇法體外純化hUC-MSCs,并通過胰酶消化傳代、擴增hUC-MSCs。取第3代細胞進行流式分析,脂肪和成骨誘導鑒定;收集不同代的細胞分別用MTT法、流式細胞術(shù)和爬片技術(shù)檢測細胞增殖活性、細胞周期、細胞凋亡率和細胞粘附能力。利用熒光定量PCR對不同代細胞的IL-6、IL-11、PCNA、Galectin-3等基因表達情況進行動態(tài)監(jiān)測,同時用Westernblot免疫印記分析Galectin-3蛋白的表達,ELISA法檢測IL-6、IL-11分泌情況。 結(jié)果:本實驗分離制備的細胞表型為CD105+/CD29+/CD44+/CD31-/CD34-/CD45-/HLA-DR-,可誘導分化為脂肪細胞和成骨細胞是典型的hUC-MSCs。傳代培養(yǎng)第3至23代細胞形態(tài)無明顯變化,細胞的生長曲線基本一致,第28代后細胞增長緩慢。第33代細胞較第3代細胞G0/G1減少17.9%、S+G2/M增加103.4%、細胞凋亡率增加316.7%,差異均有顯著的統(tǒng)計學意義(P0.01);第3至第18代細胞間G0/G1、S+G2/M、細胞凋亡率和粘附細胞數(shù)差異均無統(tǒng)計學意義(P0.05)。第33代的IL-6、IL-11、PCNA基因表達相對量分別是第3代的0.44,0.63,0.67倍,差異均有顯著的統(tǒng)計學意義(P0.01);第33代的Galectin-3基因表達相對量是第3代的0.97倍,差異無統(tǒng)計學意義(P0.05)。第33代細胞培養(yǎng)上清液中IL-6、IL-11較第3代分別減少了50.2%和59.3%,而Galectin-3無明顯差異。 結(jié)論:在體外長期培養(yǎng)環(huán)境中,隨著傳代次數(shù)的遞增,(?)UC-MSCs的增殖及粘附能力下降,細胞凋亡率增加,產(chǎn)生IL-6和IL-11的能力逐漸減弱,而Galectin-3的生成無明顯改變,總的生物活性呈逐漸下降趨勢,其最佳生物活性期出現(xiàn)在培養(yǎng)第3至18代之間。
[Abstract]:Aim: to investigate the biological activity changes and molecular mechanisms of human umbilical cord mesenchymal stem cells (human umbilical cord-MSCs, hUC-MSCs) cultured in vitro in order to provide experimental data for improving the quality and stability of long-term culture of human umbilical cord mesenchymal stem cells (MSCs) in vitro. Methods: the umbilical cord of caesarean section newborn was collected aseptically and digested by collagenase 鈪,
本文編號:2443876
[Abstract]:Aim: to investigate the biological activity changes and molecular mechanisms of human umbilical cord mesenchymal stem cells (human umbilical cord-MSCs, hUC-MSCs) cultured in vitro in order to provide experimental data for improving the quality and stability of long-term culture of human umbilical cord mesenchymal stem cells (MSCs) in vitro. Methods: the umbilical cord of caesarean section newborn was collected aseptically and digested by collagenase 鈪,
本文編號:2443876
本文鏈接:http://www.sikaile.net/xiyixuelunwen/2443876.html
最近更新
教材專著