AIM： To examine the human hepatic parenchymal and stromal components in rat liver and the phenotypic changes of human cells in liver of human-rat chimera （HRC） generated by in utero transplantation of human cells d...AIM： To examine the human hepatic parenchymal and stromal components in rat liver and the phenotypic changes of human cells in liver of human-rat chimera （HRC） generated by in utero transplantation of human cells during partial hepatectomy （PHx）-induced liver regeneration. METHODS： Human hepatic parenchymal and stromal components and phenotypic changes of human cells during liver regeneration were examined by flow oytometry, in situ hybridization and immunohistochemistry. RESULTS： ISH analysis positive cells in hepatic demonstrated human Aluparenchyma and stroma of recipient liver. Functional human hepatocytes generated in this model potentially constituted human hepatic functional units with the presence of donor-derived human endothelial and biliary duct cells in host liver. Alpha fetoprotein （AFP）^＋, CD34^＋ and CD45^＋ cells were observed in the chimeric liver on day 10 after PHxinduced liver regeneration and then disappeared in PHx group, but not in non-PHx group, suggesting that dynamic phenotypic changes of human cells expressing AFP, CD34 and CD45 cells may occur during the chimeric liver regeneration. Additionally, immunostaining for human proliferating cell nuclear antigen （PCNA） showed that the number of PCNA-positive cells in the chimeric liver of PHx group was markedly increased, as compared to that of control group, indicating that donor-derived human cells are actively proliferated during PHx-induced regeneration of HRC liver. CONCLUSION： HRC liver provides a tool for investigating human liver regeneration in a humanized animal model.展开更多
目的观察人脐带间充质干细胞(HUMSC)对糖尿病肾病大鼠肾脏缺氧诱导因子(HIF-1α)表达的影响。方法50只健康清洁级8周龄雄性SD大鼠,随机选取20只为健康对照组,其余30只采用链脲菌素复制糖尿病肾病大鼠模型(模型组),两组大鼠饲养12周。第1...目的观察人脐带间充质干细胞(HUMSC)对糖尿病肾病大鼠肾脏缺氧诱导因子(HIF-1α)表达的影响。方法50只健康清洁级8周龄雄性SD大鼠,随机选取20只为健康对照组,其余30只采用链脲菌素复制糖尿病肾病大鼠模型(模型组),两组大鼠饲养12周。第12周,随机选取两组大鼠各3只分别尾静脉注射DiR-HUMSCs,代谢12~16 h后在小动物活体光学3D成像系统下观察DiR-HUMSCs在大鼠体内的分布。随机选取9只模型组大鼠进行HUMSCs移植(HUMSCs移植组)。HUMSCs移植采用尾静脉注射方式移植浓度为1×10^(6)个/mL HUMSCs 500μL至大鼠体内,每周1次,连续4周,共28 d。检测3组大鼠的24 h尿蛋白定量(24 h UPro)、血清肌酐(Scr)、血尿素氮(BUN)、尿肌酐(Ucr)、尿白蛋白与肌酐比值(UACR)水平;酶联免疫吸附试验(ELISA)检测3组大鼠血清HIF-1α水平;采用PAS和Masson染色进行肾脏组织病理检测;免疫荧光法检测3组大鼠肾组织HIF-1α、Slc12A3和Aquaporin1蛋白的表达。结果移植HUMSCs治疗4周后,与健康对照组比较,模型组和HUMSCs移植组大鼠Ucr水平降低(P<0.05),Scr、24 h UPro、BUN、UCAR均升高(P<0.05);与模型组比较,HUMSCs移植组大鼠Ucr水平差异无统计学意义(P>0.05),Scr、24 h UPro、BUN、UCAR均降低(P<0.05)。糖尿病肾病大鼠病理损伤缓解,系膜增生和基底膜增厚改善,小管空泡变性减少,间质纤维化减轻。模型组大鼠血清HIF-1α水平较健康对照组升高(P<0.05),HUMSCs移植组血清HIF-1α水平较模型组下降(P<0.05)。与健康对照组比较,模型组大鼠肾脏远端小管中HIF-1α蛋白水平增加(P<0.05);HUMSCs移植组的HIF-1α蛋白水平较模型组降低(P<0.05)。模型组远端小管标记蛋白Slc12A3水平低于健康对照组(P<0.05),HUMSCs移植组Slc12A3水平较模型组升高(P<0.05)。HUMSCs移植组的Aquaporin1蛋白水平较模型组和健康对照组均降低(P<0.05)。糖尿病肾病大鼠近端小管中无HIF-1α表达。结论HIF-1α主要在糖尿病肾病大鼠肾脏远端小管表达,且HUMSCs可通过抑制HIF-1α的表达修复肾小管的损伤。展开更多
基金Supported by The National Natural Science Foundation of China, No. 30271177 and No. 39870676the Major Scienceand Technology Projects of Guangdong Province, No. B602+4 种基金the Natural Science Foundation of Guangdong Province, No.021903the Science and Technology Planning Project of Guangdong Province, No. 2009B060300008the Science and Technology Projects of Guangzhou City, No. 2002Z2E0121the Medical Scientific Research Foundation of Guangdong Province, No. A2007359the Science and Technology Talented Man Foundation of Outstanding Young and Middle-aged People of Southern Medical University,the Special Fund of Scientific Instrument Collaborative Share-net in Guangzhou, No. 2006176
文摘AIM： To examine the human hepatic parenchymal and stromal components in rat liver and the phenotypic changes of human cells in liver of human-rat chimera （HRC） generated by in utero transplantation of human cells during partial hepatectomy （PHx）-induced liver regeneration. METHODS： Human hepatic parenchymal and stromal components and phenotypic changes of human cells during liver regeneration were examined by flow oytometry, in situ hybridization and immunohistochemistry. RESULTS： ISH analysis positive cells in hepatic demonstrated human Aluparenchyma and stroma of recipient liver. Functional human hepatocytes generated in this model potentially constituted human hepatic functional units with the presence of donor-derived human endothelial and biliary duct cells in host liver. Alpha fetoprotein （AFP）^＋, CD34^＋ and CD45^＋ cells were observed in the chimeric liver on day 10 after PHxinduced liver regeneration and then disappeared in PHx group, but not in non-PHx group, suggesting that dynamic phenotypic changes of human cells expressing AFP, CD34 and CD45 cells may occur during the chimeric liver regeneration. Additionally, immunostaining for human proliferating cell nuclear antigen （PCNA） showed that the number of PCNA-positive cells in the chimeric liver of PHx group was markedly increased, as compared to that of control group, indicating that donor-derived human cells are actively proliferated during PHx-induced regeneration of HRC liver. CONCLUSION： HRC liver provides a tool for investigating human liver regeneration in a humanized animal model.
文摘目的观察人脐带间充质干细胞(HUMSC)对糖尿病肾病大鼠肾脏缺氧诱导因子(HIF-1α)表达的影响。方法50只健康清洁级8周龄雄性SD大鼠,随机选取20只为健康对照组,其余30只采用链脲菌素复制糖尿病肾病大鼠模型(模型组),两组大鼠饲养12周。第12周,随机选取两组大鼠各3只分别尾静脉注射DiR-HUMSCs,代谢12~16 h后在小动物活体光学3D成像系统下观察DiR-HUMSCs在大鼠体内的分布。随机选取9只模型组大鼠进行HUMSCs移植(HUMSCs移植组)。HUMSCs移植采用尾静脉注射方式移植浓度为1×10^(6)个/mL HUMSCs 500μL至大鼠体内,每周1次,连续4周,共28 d。检测3组大鼠的24 h尿蛋白定量(24 h UPro)、血清肌酐(Scr)、血尿素氮(BUN)、尿肌酐(Ucr)、尿白蛋白与肌酐比值(UACR)水平;酶联免疫吸附试验(ELISA)检测3组大鼠血清HIF-1α水平;采用PAS和Masson染色进行肾脏组织病理检测;免疫荧光法检测3组大鼠肾组织HIF-1α、Slc12A3和Aquaporin1蛋白的表达。结果移植HUMSCs治疗4周后,与健康对照组比较,模型组和HUMSCs移植组大鼠Ucr水平降低(P<0.05),Scr、24 h UPro、BUN、UCAR均升高(P<0.05);与模型组比较,HUMSCs移植组大鼠Ucr水平差异无统计学意义(P>0.05),Scr、24 h UPro、BUN、UCAR均降低(P<0.05)。糖尿病肾病大鼠病理损伤缓解,系膜增生和基底膜增厚改善,小管空泡变性减少,间质纤维化减轻。模型组大鼠血清HIF-1α水平较健康对照组升高(P<0.05),HUMSCs移植组血清HIF-1α水平较模型组下降(P<0.05)。与健康对照组比较,模型组大鼠肾脏远端小管中HIF-1α蛋白水平增加(P<0.05);HUMSCs移植组的HIF-1α蛋白水平较模型组降低(P<0.05)。模型组远端小管标记蛋白Slc12A3水平低于健康对照组(P<0.05),HUMSCs移植组Slc12A3水平较模型组升高(P<0.05)。HUMSCs移植组的Aquaporin1蛋白水平较模型组和健康对照组均降低(P<0.05)。糖尿病肾病大鼠近端小管中无HIF-1α表达。结论HIF-1α主要在糖尿病肾病大鼠肾脏远端小管表达,且HUMSCs可通过抑制HIF-1α的表达修复肾小管的损伤。
