目的探讨巨噬细胞(Mc)对小鼠诱导多能干细胞(iPSCs)向肝祖细胞(HPCs)分化的影响。方法C57BL/6N小鼠24只,采取腹腔冲洗法获得巨噬细胞,收集上清获得巨噬细胞条件培养基(Mc-CDM)。通过激活素A、骨形态发生蛋白4和成纤维细胞生长因子等诱...目的探讨巨噬细胞(Mc)对小鼠诱导多能干细胞(iPSCs)向肝祖细胞(HPCs)分化的影响。方法C57BL/6N小鼠24只,采取腹腔冲洗法获得巨噬细胞,收集上清获得巨噬细胞条件培养基(Mc-CDM)。通过激活素A、骨形态发生蛋白4和成纤维细胞生长因子等诱导小鼠iPSCs向HPCs分化。将HPCs的诱导分为两组,一组使用正常培养基,为对照组(Ctrl组);另一组在诱导D5使用Mc-CDM培养基,为实验组(Mc组)。通过形态学、免疫荧光、Western Blot检测方法,比较正常Ctrl组与Mc组HPCs的形态及相关蛋白表达的差异。计量资料两组间比较采用t检验。结果在体外建立了iPSCs来源的HPCs;HPCs具有向肝细胞分化的潜能。免疫荧光结果显示:与第12天的Ctrl组相比,第12天的Mc组的肝祖细胞特异性蛋白CK19的表达显著增高(0.901±0.072 vs 0.686±0.097,t=-3.093,P<0.05);Western Blot结果显示:与第12天Ctrl组相比,第12天Mc组肝祖细胞相关蛋白CK19的表达显著增高(1.922±0.103 vs 1.448±0.012,t=-7.881,P<0.05);同时,第12天Mc组自噬相关蛋白LC3的表达亦显著增高(1.392±0.042 vs 1.101±0.048,t=-5.978,P<0.05)。结论巨噬细胞可促进小鼠iPSCs向HPCs分化,其机制可能与HPCs细胞自噬水平增加有关。展开更多
Hepatic progenitor cells(called oval cells in rodents) proliferate during chronic liver injury. They have been suggested as targets of malignant transformation in chronic liver diseases, including chronic hepatitis C....Hepatic progenitor cells(called oval cells in rodents) proliferate during chronic liver injury. They have been suggested as targets of malignant transformation in chronic liver diseases, including chronic hepatitis C. Interferon alpha therapy reduces the risk of hepatocellular carcinoma (HCC) in chronic hepatitis C regardless of viral clearance. The aim of this study was to determine whether interferon alpha could reduce the risk of HCC by modifying preneoplastic events in the hepatic progenitor cell population. Pre-and post-treatment liver biopsies were evaluated for changes in the hepatic progenitor cell population in 16 patients with non-responding chronic hepatitis C. Interferon alpha-based treatment significantly reduced the numbers of c-kit-positive hepatic progenitor cells by 50%. To determine the mechanism of cell number reduction, the effects of interferon alpha on murine hepatic progenitor cells were studied in vitro. MTT(3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) proliferation assay and proliferating cell nuclear antigen staining showed that interferon alpha had a dose-dependent, anti-proliferative effect. Interferon alpha stimulated hepatocytic and biliary differentiation of the oval cell lines reflected by increased expression of albumin and cytokeratin 19 accompanied by decreased expression of alpha fetoprotein and Thy-1. To validate these results in vivo,mice were placed on the choline-deficient, ethionine-supplemented diet to induce liver injury and oval cell proliferation and treated with pegylated interferon alpha 2b for 2 weeks. This resulted in a significant four-fold reduction in the number of oval cells (P < .05). In conclusion, interferon alpha-based treatment reduced the number of hepatic progenitor cells in chronic liver injury by modulating apoptosis, proliferation, and differentiation.展开更多
文摘目的探讨巨噬细胞(Mc)对小鼠诱导多能干细胞(iPSCs)向肝祖细胞(HPCs)分化的影响。方法C57BL/6N小鼠24只,采取腹腔冲洗法获得巨噬细胞,收集上清获得巨噬细胞条件培养基(Mc-CDM)。通过激活素A、骨形态发生蛋白4和成纤维细胞生长因子等诱导小鼠iPSCs向HPCs分化。将HPCs的诱导分为两组,一组使用正常培养基,为对照组(Ctrl组);另一组在诱导D5使用Mc-CDM培养基,为实验组(Mc组)。通过形态学、免疫荧光、Western Blot检测方法,比较正常Ctrl组与Mc组HPCs的形态及相关蛋白表达的差异。计量资料两组间比较采用t检验。结果在体外建立了iPSCs来源的HPCs;HPCs具有向肝细胞分化的潜能。免疫荧光结果显示:与第12天的Ctrl组相比,第12天的Mc组的肝祖细胞特异性蛋白CK19的表达显著增高(0.901±0.072 vs 0.686±0.097,t=-3.093,P<0.05);Western Blot结果显示:与第12天Ctrl组相比,第12天Mc组肝祖细胞相关蛋白CK19的表达显著增高(1.922±0.103 vs 1.448±0.012,t=-7.881,P<0.05);同时,第12天Mc组自噬相关蛋白LC3的表达亦显著增高(1.392±0.042 vs 1.101±0.048,t=-5.978,P<0.05)。结论巨噬细胞可促进小鼠iPSCs向HPCs分化,其机制可能与HPCs细胞自噬水平增加有关。
文摘Hepatic progenitor cells(called oval cells in rodents) proliferate during chronic liver injury. They have been suggested as targets of malignant transformation in chronic liver diseases, including chronic hepatitis C. Interferon alpha therapy reduces the risk of hepatocellular carcinoma (HCC) in chronic hepatitis C regardless of viral clearance. The aim of this study was to determine whether interferon alpha could reduce the risk of HCC by modifying preneoplastic events in the hepatic progenitor cell population. Pre-and post-treatment liver biopsies were evaluated for changes in the hepatic progenitor cell population in 16 patients with non-responding chronic hepatitis C. Interferon alpha-based treatment significantly reduced the numbers of c-kit-positive hepatic progenitor cells by 50%. To determine the mechanism of cell number reduction, the effects of interferon alpha on murine hepatic progenitor cells were studied in vitro. MTT(3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) proliferation assay and proliferating cell nuclear antigen staining showed that interferon alpha had a dose-dependent, anti-proliferative effect. Interferon alpha stimulated hepatocytic and biliary differentiation of the oval cell lines reflected by increased expression of albumin and cytokeratin 19 accompanied by decreased expression of alpha fetoprotein and Thy-1. To validate these results in vivo,mice were placed on the choline-deficient, ethionine-supplemented diet to induce liver injury and oval cell proliferation and treated with pegylated interferon alpha 2b for 2 weeks. This resulted in a significant four-fold reduction in the number of oval cells (P < .05). In conclusion, interferon alpha-based treatment reduced the number of hepatic progenitor cells in chronic liver injury by modulating apoptosis, proliferation, and differentiation.
