目的 分析微囊化肝细胞移植对急性肝衰竭大鼠肝细胞再生的影响.方法 通过腹腔注射d-氨基半乳糖(d-gal)建立急性肝衰竭大鼠模型,18 h后将造模动物随机分成生理盐水组(Ⅰ)、裸肝细胞移植组(Ⅱ)和微囊化肝细胞移植组(Ⅲ).造模后6、12、24...目的 分析微囊化肝细胞移植对急性肝衰竭大鼠肝细胞再生的影响.方法 通过腹腔注射d-氨基半乳糖(d-gal)建立急性肝衰竭大鼠模型,18 h后将造模动物随机分成生理盐水组(Ⅰ)、裸肝细胞移植组(Ⅱ)和微囊化肝细胞移植组(Ⅲ).造模后6、12、24、36、48、72、120、168及240 h时,从各组随机抽取6只大鼠,留下腔静脉血观察肝功能变化,取肝组织用免疫组织化学法检测增殖细胞核抗原(pcna)的表达.另取6只正常大鼠的肝组织作为参考值.结果 Ⅰ、Ⅱ、Ⅲ组大鼠10 d生存率分别是26.7%(4/15)、40.0%(6/15)和73.3%(11/15),3组间大鼠生存率差异有统计学意义(x2=9.349,p=0.009).Ⅲ组大鼠生存率较Ⅰ、Ⅱ组有明显提高.造模后6 h,各组大鼠的alt、ast均有所升高,以36~72 h最为明显.Ⅱ、Ⅲ组的alt、ast自36 h开始下降,Ⅲ组的下降较Ⅱ组显著.Ⅰ组造模后tbil逐渐升高,72 h时达最高峰;Ⅱ、Ⅲ组的tbil在48 h时开始下降,其中,在36、48和72 h时Ⅲ组下降较Ⅱ组更为显著.免疫组织化学结果表明,正常组pcna蛋白呈弱阳性或阴性表达,造模后表达量逐渐增多,48 h时达最高峰.其中,Ⅲ组的表达量显著高于Ⅰ、Ⅱ组.结论 微囊化肝细胞移植促进了肝细胞的再生,并可改善急性肝衰竭大鼠的肝功能和预后.
abstract:
objective to investigate liver regeneration after transplantation of microencapsulated hepatocytes in rats with acute liver failure (alf). methods alf rat model was established by intraperitoneal injection of d-galactosamine (d-galn). after 18 h, rats were randomized into control group ( Ⅰ ), free hepatoeyte transplantation group ( Ⅱ ) and the microencapsulated hepatecyte transplantation group (Ⅲ). six rats for each group were randomly selected and sacrificed at 6, 12, 24, 36, 48, 72, 120, 168 and 240 h after alf induced and blood samples from inferior vena cava were collected. liver functions were tested in blood samples, and the expression of proliferating cell nuclear antigen (pcna) was detected by immunohistochemistry. results ten-day survival rates of 3 groups were 26.7% (4/15), 40.0% (6/15) and 73. 3% (11/15), respectively (x2 = 9. 349,p = 0. 009). survival rate of group Ⅲ was significantly higher than that of group Ⅰ and Ⅱ. levels of alt and ast in each group increased significantly at 6 h after alf induced, and peaked between 48 ~ 72 h. levels of alt and ast in group Ⅱ and Ⅲ declined from 36 h, which was more significant in group Ⅲ. tbil levels in group Ⅰ gradually increased after alf induced and peaked at 72 h. tbil in group Ⅱ and Ⅲ declined from 48 h, which was more markedly in group Ⅲ. in normal rats, the expression of pcna protein was almost negative, but it was strongly expressed in alf rats and peaked at 48 h. the number of positive cells in group Ⅲ was higher than that in group Ⅰ and Ⅱ, and the differences were of statistical signifieance. conclusion the transplantation of microencapsulated hepatocytes can promote the regeneration of liver, and it can improve the liver function and prognosis in rats with alf.展开更多
目的观察大鼠肝细胞、转基因肝星状细胞株HGF/CFSC和/或大鼠骨髓来源Thy-1+β2M-细胞(BDTC)共微囊化对肝细胞生物学活性的支持,及腹腔移植混合细胞微囊对急性肝衰竭大鼠肝功能的改善作用.方法利用微囊发生器制备含肝细胞或混合细胞的微...目的观察大鼠肝细胞、转基因肝星状细胞株HGF/CFSC和/或大鼠骨髓来源Thy-1+β2M-细胞(BDTC)共微囊化对肝细胞生物学活性的支持,及腹腔移植混合细胞微囊对急性肝衰竭大鼠肝功能的改善作用.方法利用微囊发生器制备含肝细胞或混合细胞的微囊,依微囊内包裹细胞种类不同,分为微囊化肝细胞组、微囊化肝细胞+CFSC/HGF组)和微囊化肝细胞+CFSC/HGF+BDTC组,通过观察囊内细胞形态和体外培养测定培养液中白蛋白和尿素的分泌,判断各组囊内肝细胞活性和功能的维持;将90%肝大部切除所致的急性肝衰竭大鼠按照移植微囊种类不同分为空囊对照组和上述3个实验组(每组10只),观察腹腔植入后不同时间大鼠的一般状况、存活时间、血生化改变、肝组织再生及微囊化移植物的组织学特征.结果与单独肝细胞微囊者相比,混合细胞微囊内肝细胞存活时间超过1倍,培养液中白蛋白分泌和尿素合成量明显增加(均P<0.01);与对照组相比,微囊化肝细胞或微囊化混合肝细胞移植后,急性肝衰竭大鼠的肝功能显著改善、存活率明显提高(10/10 vs 1/10),其肝组织再生完全;移植21~42 d时,部分微囊附着于肝脏表面并出现血管化,微囊表面存在不同程度的纤维化,微囊内仍有存活的细胞,以微囊化混合肝细胞组优于微囊化肝细胞组.结论混合细胞共微囊化能明显改善囊内肝细胞的存活寿命、形态和功能的维持,微囊化混合肝细胞腹腔移植对促进急性肝衰竭大鼠的肝功能恢复具有显著作用.展开更多
AIM: To investigate intraperitoneal transplantation of microencapsulated hepatic-like cells from human umbilical cord blood for treatment of hepatic failure in rats. METHODS: CD34+ cells in umbilical cord blood cells ...AIM: To investigate intraperitoneal transplantation of microencapsulated hepatic-like cells from human umbilical cord blood for treatment of hepatic failure in rats. METHODS: CD34+ cells in umbilical cord blood cells were isolated by magnetic cell sorting. In the in vitro experiment, sorted CD34+ cells were amplified and induced into hepatic-like cells by culturing with a combination of fibroblast growth factor 4 and hepatocyte growth factor. Cultures without growth factor addition served as controls. mRNA and protein levels for hepatic-like cells were analyzed by reverse transcription-polymerase chain reaction, immunohistochemistry and immunofluorescence. In the in vivo experiment, the hepatic-like cells were encapsulated and transplanted into the abdominal cavity of acute hepatic failure (AHF) rats at 48 h after D-galactosamine induction of acute hepatic failure. Transplantation with PBS and unencapsulated hepatic-like cells served as controls. The mortality rate, hepatic pathological changes and serum biochemical indexes were determined. The morphology and structure of microcapsules in the greater omentum were observed. RESULTS: Human albumin, alpha-fetoprotein and GATA-4 mRNA and albumin protein positive cells were found among cultured cells after 16 d. Albumin level in culture medium was significantly increased after culturing with growth factors in comparison with culturing without growth factor addition (P < 0.01). Compared with the unencapsulated group, the mortality rate of the encapsulated hepatic-like cell-transplanted group was significantly lower (P < 0.05). Serum biochemical parameters, alanine aminotransferase, aspartate aminotransferase and total bilirubin in the encapsulated group were significantly improvement compared with the PBS control group (P < 0.01). Pathological staining further supported these findings. At 1-2 wk post-transplantation, free microcapsules with a round clear structure and a smooth surface were observed in peritoneal lavage fluid, surviving cells inside microcapsules were found by trypan blue staining, but some fibrous tissue around microcapsules was also detected in the greater omentum of encapsulated group by hematoxylin and eosin staining. CONCLUSION: Transplantation of microencapsulated hepatic-like cells derived from umbilical cord blood cells could preliminarily alleviate the symptoms of AHF rats.展开更多
文摘目的 分析微囊化肝细胞移植对急性肝衰竭大鼠肝细胞再生的影响.方法 通过腹腔注射d-氨基半乳糖(d-gal)建立急性肝衰竭大鼠模型,18 h后将造模动物随机分成生理盐水组(Ⅰ)、裸肝细胞移植组(Ⅱ)和微囊化肝细胞移植组(Ⅲ).造模后6、12、24、36、48、72、120、168及240 h时,从各组随机抽取6只大鼠,留下腔静脉血观察肝功能变化,取肝组织用免疫组织化学法检测增殖细胞核抗原(pcna)的表达.另取6只正常大鼠的肝组织作为参考值.结果 Ⅰ、Ⅱ、Ⅲ组大鼠10 d生存率分别是26.7%(4/15)、40.0%(6/15)和73.3%(11/15),3组间大鼠生存率差异有统计学意义(x2=9.349,p=0.009).Ⅲ组大鼠生存率较Ⅰ、Ⅱ组有明显提高.造模后6 h,各组大鼠的alt、ast均有所升高,以36~72 h最为明显.Ⅱ、Ⅲ组的alt、ast自36 h开始下降,Ⅲ组的下降较Ⅱ组显著.Ⅰ组造模后tbil逐渐升高,72 h时达最高峰;Ⅱ、Ⅲ组的tbil在48 h时开始下降,其中,在36、48和72 h时Ⅲ组下降较Ⅱ组更为显著.免疫组织化学结果表明,正常组pcna蛋白呈弱阳性或阴性表达,造模后表达量逐渐增多,48 h时达最高峰.其中,Ⅲ组的表达量显著高于Ⅰ、Ⅱ组.结论 微囊化肝细胞移植促进了肝细胞的再生,并可改善急性肝衰竭大鼠的肝功能和预后.
abstract:
objective to investigate liver regeneration after transplantation of microencapsulated hepatocytes in rats with acute liver failure (alf). methods alf rat model was established by intraperitoneal injection of d-galactosamine (d-galn). after 18 h, rats were randomized into control group ( Ⅰ ), free hepatoeyte transplantation group ( Ⅱ ) and the microencapsulated hepatecyte transplantation group (Ⅲ). six rats for each group were randomly selected and sacrificed at 6, 12, 24, 36, 48, 72, 120, 168 and 240 h after alf induced and blood samples from inferior vena cava were collected. liver functions were tested in blood samples, and the expression of proliferating cell nuclear antigen (pcna) was detected by immunohistochemistry. results ten-day survival rates of 3 groups were 26.7% (4/15), 40.0% (6/15) and 73. 3% (11/15), respectively (x2 = 9. 349,p = 0. 009). survival rate of group Ⅲ was significantly higher than that of group Ⅰ and Ⅱ. levels of alt and ast in each group increased significantly at 6 h after alf induced, and peaked between 48 ~ 72 h. levels of alt and ast in group Ⅱ and Ⅲ declined from 36 h, which was more significant in group Ⅲ. tbil levels in group Ⅰ gradually increased after alf induced and peaked at 72 h. tbil in group Ⅱ and Ⅲ declined from 48 h, which was more markedly in group Ⅲ. in normal rats, the expression of pcna protein was almost negative, but it was strongly expressed in alf rats and peaked at 48 h. the number of positive cells in group Ⅲ was higher than that in group Ⅰ and Ⅱ, and the differences were of statistical signifieance. conclusion the transplantation of microencapsulated hepatocytes can promote the regeneration of liver, and it can improve the liver function and prognosis in rats with alf.
文摘目的观察大鼠肝细胞、转基因肝星状细胞株HGF/CFSC和/或大鼠骨髓来源Thy-1+β2M-细胞(BDTC)共微囊化对肝细胞生物学活性的支持,及腹腔移植混合细胞微囊对急性肝衰竭大鼠肝功能的改善作用.方法利用微囊发生器制备含肝细胞或混合细胞的微囊,依微囊内包裹细胞种类不同,分为微囊化肝细胞组、微囊化肝细胞+CFSC/HGF组)和微囊化肝细胞+CFSC/HGF+BDTC组,通过观察囊内细胞形态和体外培养测定培养液中白蛋白和尿素的分泌,判断各组囊内肝细胞活性和功能的维持;将90%肝大部切除所致的急性肝衰竭大鼠按照移植微囊种类不同分为空囊对照组和上述3个实验组(每组10只),观察腹腔植入后不同时间大鼠的一般状况、存活时间、血生化改变、肝组织再生及微囊化移植物的组织学特征.结果与单独肝细胞微囊者相比,混合细胞微囊内肝细胞存活时间超过1倍,培养液中白蛋白分泌和尿素合成量明显增加(均P<0.01);与对照组相比,微囊化肝细胞或微囊化混合肝细胞移植后,急性肝衰竭大鼠的肝功能显著改善、存活率明显提高(10/10 vs 1/10),其肝组织再生完全;移植21~42 d时,部分微囊附着于肝脏表面并出现血管化,微囊表面存在不同程度的纤维化,微囊内仍有存活的细胞,以微囊化混合肝细胞组优于微囊化肝细胞组.结论混合细胞共微囊化能明显改善囊内肝细胞的存活寿命、形态和功能的维持,微囊化混合肝细胞腹腔移植对促进急性肝衰竭大鼠的肝功能恢复具有显著作用.
基金Supported by Guangdong Natural Science Foundation (9151030002000008)Shenzhen Science and Technology Plan-ning Priority Program (JH200205270412B, 200808001, 200801012)
文摘AIM: To investigate intraperitoneal transplantation of microencapsulated hepatic-like cells from human umbilical cord blood for treatment of hepatic failure in rats. METHODS: CD34+ cells in umbilical cord blood cells were isolated by magnetic cell sorting. In the in vitro experiment, sorted CD34+ cells were amplified and induced into hepatic-like cells by culturing with a combination of fibroblast growth factor 4 and hepatocyte growth factor. Cultures without growth factor addition served as controls. mRNA and protein levels for hepatic-like cells were analyzed by reverse transcription-polymerase chain reaction, immunohistochemistry and immunofluorescence. In the in vivo experiment, the hepatic-like cells were encapsulated and transplanted into the abdominal cavity of acute hepatic failure (AHF) rats at 48 h after D-galactosamine induction of acute hepatic failure. Transplantation with PBS and unencapsulated hepatic-like cells served as controls. The mortality rate, hepatic pathological changes and serum biochemical indexes were determined. The morphology and structure of microcapsules in the greater omentum were observed. RESULTS: Human albumin, alpha-fetoprotein and GATA-4 mRNA and albumin protein positive cells were found among cultured cells after 16 d. Albumin level in culture medium was significantly increased after culturing with growth factors in comparison with culturing without growth factor addition (P < 0.01). Compared with the unencapsulated group, the mortality rate of the encapsulated hepatic-like cell-transplanted group was significantly lower (P < 0.05). Serum biochemical parameters, alanine aminotransferase, aspartate aminotransferase and total bilirubin in the encapsulated group were significantly improvement compared with the PBS control group (P < 0.01). Pathological staining further supported these findings. At 1-2 wk post-transplantation, free microcapsules with a round clear structure and a smooth surface were observed in peritoneal lavage fluid, surviving cells inside microcapsules were found by trypan blue staining, but some fibrous tissue around microcapsules was also detected in the greater omentum of encapsulated group by hematoxylin and eosin staining. CONCLUSION: Transplantation of microencapsulated hepatic-like cells derived from umbilical cord blood cells could preliminarily alleviate the symptoms of AHF rats.