丹黄方对部分肝叶切除大鼠肝组织中Tec的影响

目的探讨丹黄方对部分肝叶切除大鼠肝组织中Tec mRNA表达的影响。方法采用部分肝叶切除肝再生模型。24只大鼠随机分为假手术组、手术组、丹黄方组和pHGF组。除假手术组外其余三组接受部分肝叶切除手术。从手术前3天至手术后48小时,丹黄方组给与丹黄方灌胃（10g/kg）及腹腔注射生理盐水（4．0ml/kg）,每天一次;促肝细胞生长素（pHGF）组给与生理盐水灌胃（4．0ml／kg）和腹腔注射pHGF（1ml/100g）,每天一次;手术组及假手术组仅给与生理盐水（4．0ml／kg）灌胃和腹腔注射。采用RT—PCR方法检测Tec mRNA的表达。结果丹黄方组肝组织中Tec mRNA的表达显著高于假手术组和手术组,P〈0．01;与pHGF组比较无显著差异,P〉0．05。结论丹黄方具有促进部分肝叶切除大鼠肝组织中Tec mRNA的表达的作用。     

丹黄方对部分肝叶切除大鼠肝组织中肝细胞生长因子的影响

[目的]探讨丹黄方对部分肝叶切除大鼠肝组织中肝细胞生长因子（hepatocyte growth factor，HGF）mRNA表达的影响。[方法]采用部分肝叶切除肝再生模型。24只大鼠随机分为假手术组、手术组、丹黄方组和促肝细胞生长素（pHGF）组。除假手术组外，其余3组接受部分肝叶切除手术。从手术前3d至手术后48h，丹黄方组给予丹黄方（10g／kg）灌胃及0．85％氯化钠（4．0ml／kg）腹腔注射，每天1次；pHGF组给予0．85％氯化钠（4．0ml／kg）灌胃和pHGF（1ml／100g）腹腔注射，每天1次；手术组及假手术组仅给予0．85％氯化钠（4．0ml／kg）灌胃和腹腔注射。采用RT-PCR方法检测HGFmRNA的表达。[结果]丹黄方组肝组织中HGFmRNA的表达显著高于假手术组和手术组（P〈0．01），与pHGF组比较差异无统计学意义（P〉0．05）。[结论]丹黄方具有促进部分肝叶切除大鼠肝组织中HGFmRNA的表达作用。     

肝细胞生长因子能否刺激肝再生的研究

研究表明,涉及促进肝细胞再生的细胞因子、激素计20余种。许多生长因子的核酸已被克隆和序列化。对肝细胞再生的研究已从动物肝细胞的培养到应用人肝细胞进行培养,制作暴发性肝衰竭(FHF)及肝硬变的动物模型,对动物及人肝组织进行增殖细胞核抗原(PCNA)表达的研究。10余年来,大     

暴发性肝衰竭动物肝再生的实验研究

目的：观察急性肝损伤，暴发性肝衰竭时肝再生的变化及血浆内毒素变化地暴发性肝衰竭肝再生的影响。方法：硫代乙酰胺复制动物模型，鲎试剂法测定血浆毒含量，流式细胞仪及增殖细胞核抗原免疫组化测定细胞增殖情况。结果：暴发性肝衰竭增殖细胞核抗原标志指数及肝细胞增殖指数较性肝损伤明显增高（Ｐ值〈０．０５），暴发性肝衰竭早期血浆内毒素与细胞增殖指数呈正相关（ｒ＝０．８７４５，Ｐ值〈０．０１），但暴发性肝衰竭晚期血浆     

急性肝衰竭大鼠肝星状细胞内质网应激调节HGF表达实验研究

目的 研究内质网应激(ERS)调节急性肝衰竭(ALF)大鼠肝星状细胞肝细胞生长因子(HGF)表达的作用机制.方法 60只清洁级SD大鼠作为实验动物,采用随机数字表法将60只大鼠分为A、B、C三组,每组20只.三组大鼠均利用D-氨基半乳糖(D-GaIN)与脂多糖(LPS)构建ALF大鼠模型.A、C两组大鼠在建模术后1 h...     

第三届国际暨全国肝衰竭与人工肝学术会议纪要

第三届国际暨全国肝衰竭与人工肝学术会议于2005年3月25—27日在苏州隆重举行。会议共收到论文138篇，其中专题报告17篇，大会发言22篇。来自国内外的400余名代表参加本次大会。美国Cedars-sinai医学中心Achiles Demetriou教授，日本冈山大学田中纪章教授，德国柏林洪堡大学Virchow医院Igor M．Sauer教授，新加坡同立大学医院Lee kang Hoe教授，     

大鼠部分肝切除后肝细胞生长因子激活因子抑制因子1,2的表达

目的探讨肝细胞生长因子激活因子抑制因子(hepatocyte growth factor activator inhibitor,HAI)1、HAI-2在部分肝切除后的表达特点,分析HAI-1和HAI-2在肝再生中的作用。方法随机将健康雄性SD大鼠分成对照组和肝切除组,各30只。在肝切除手术前和手术后3 h、12 h、24 h以及48 h时,对比2组HAI-1和HAI-2 mRNA和蛋白的表达变化。结果手术前2组HAI-1、HAI-2的mRNA及蛋白均呈显著低表达,组间无明显差异(P0.05);与手术前相比,术后对照组HAI-1、HAI-2的mRNA及蛋白均无明显变化(P0.05);而肝切除组HAI-1 mRNA和蛋白表达水平先显著升高再逐渐下降,同时间点与对照组比较,差异均有统计学意义(P0.05);HAI-2 mRNA和蛋白则无明显变化(P0.05)。结论 HAI-1在部分肝切除肝细胞再生过程中呈持续高表达,其可能参与了肝细胞再生过程,而HAI-2对肝再生过程无明显影响。     

Notch/Jagged信号在肝部分切除后肝再生中的表达

目的研究Notch/Jagged信号传导通路在大鼠肝部分切除术后肝再生中所起的作用。方法取雌性wister大鼠行肝部分切除术,术后0 min、5 min、15 min、30 min、1 h、3 h、6 h、12 h、1 d、2 d、4 d、7 d留取再生肝组织,观察大体组织变化,检测Notch-1和Jagged-1蛋白的表达,并通过RT-PCR检测Notch-1和Jagged-1的mRNA的表达。结果再生肝Notch-1蛋白第2 d在门脉周围细胞表达增强,第4 d在肝血窦内皮细胞表达增强,Jagged-1在正常肝脏标本中在胆管分布,在肝细胞也有少量表达。在再生的肝上,第2 d在门脉周围的肝细胞上较强地表达,第4 d在胆管内皮细胞表达增强。Notch-1的mRNA表达量在6 h-2 d下调,Jagged-1的mRNA表达量在3-6 h上调,12 h-2 d下调,4 d恢复。统计学处理采用方差分析方法、t检验及直线相关方法（P〈0.05）。结论Notch/Jagged信号通路的激活在肝再生中扮演着重要的角色。它可以促进胆管的形成和结构维持,有助于新生血管的形成及肝细胞的增殖。     

肝细胞生成素及肝部分切除快速诱导肝再生相关基因Tec的表达

目的：肝部分切除术后肝细胞生成素（HPO）迅速增加，该文观察人重组肝细胞生成素（rhHPO）和肝部分切除（PH）迅速诱导瞬时早期反应基因表达情况。方法：将Wister大鼠分为PH组和对照组，每组3只。利用表达性差异显示分析技术和序列分析，检测2／3 PH后1h及原代培养大鼠肝细胞体系的选择性基因表达。结果：EST库中的大部分为瞬时早期反应基因，发现一种新的可能与肝再生调控相关的Tec基因，Northern杂交证实2／3 PH可迅速诱导Tec基因的表达，其表达高峰为术后1－2h。HPO在原代培养大鼠肝细胞体系中可迅速诱导瞬时早期反应基因（c-fos、LRF－1和Tec等）表达。结论：HPO和PH可迅速诱导瞬时早期反应基因表达，首次报道了Tec基因是一种与肝再生调控密切相关的早期反应基因。     

肝细胞生成素及肝部分切除诱导肝再生基因PC3的表达

目的 观察重组人肝细胞生成素（rhHPO)和肝部分切除迅速诱导瞬时早期反应基因表达情况。方法 利用表达性差异显示分析技术和序列分析研究2／3肝部分切除后1h及原代培养大鼠肝细胞体系的选择性基因表达。结果 揭示EST集中的大部分为瞬时早期反应基因，发现一种可能与肝再生调控相关的新基因PC3，Northern杂交证实2／3肝部分切除可迅速诱导PC3基因的表达，其表达高峰为术后1－2h。HPO在原代培养大鼠肝细胞体系中可迅速诱导瞬时早期反应基因（c-fos,LRF-1和PC3等）表达。结论 HPO和肝部分切除可迅速诱导瞬时早期反应基因表达，PC3基因是一种与肝再生调控密切相关的早期反应基因。     

The clinical value of hepatocyte growth factor and its receptor—c-met for liver cancer patients with hepatectomy

BACKGROUND: To study the dynamic change of hepatocyte growth factor after hepatectomy in patients with primary liver cancer, and to analyse the prognostic value of hepatocyte growth factor and c-met for these patients. METHODS: Thirty-one consecutive patients undergoing partial hepatectomy for liver cancer were studied. Serum hepatocyte growth factor level was determined by using enzyme-linked immunosorbent assay kit before and after operation, respectively. C-met protein and MRNA expressions in cancerous and paracancerous tissues were examined by immunohistochemical and RT-PCR methods, respectively. The correlations between clinical-pathologic parameters and the expressions of hepatocyte growth factor in serum and c-met in cancerous tissues were analysed, respectively. RESULTS: Liver cancer patients had a significantly higher level of serum hepatocyte growth factor than normal controls (1.0424+/-0.498 ng/ml versus 0.685+/-0.115 ng/ml, p=0.008). Serum hepatocyte growth factor level was positively affected by tumour size, node cirrhosis, portal vein tumour thrombi, cholangiocarcinoma (including combined hepatocellular carcinoma), poorly differentiated hepatocellular carcinoma and tumour recurrence or metastases. After hepatectomy, serum hepatocyte growth factor level peaked on the third postoperative day, and then declined, but did not return to normal level on the postoperative day 10. From the preoperative day to postoperative day 10, the level of serum hepatocyte growth factor had a decrease of percent (85.33+/-10.2%) in the group with large tumours (>5 cm), but an elevation of percent (121.9+/-10.3%) in the group with small tumours (相似文献   

Differentiation of rat bone marrow stem cells in liver after partial hepatectomy

AIM: To investigate the differentiation of rat bone marrow stem cells in liver after partial hepatectomy. METHODS: Bone marrow cells were collected from the tibia of rat with partial hepatectomy, the medial and left hepatic lobes were excised. The bone marrow stem cells (Thy CD3-CD45RA- cells) were enriched from the bone marrow cells by depleting red cells and fluorescence-activated cell sorting. The sorted bone marrow stem cells were labeled by PKH26-GL in vitro and autotransplanted by portal vein injection. After 2 wk, the transplanted bone marrow stem cells in liver were examined by the immunohistochemistry of albumin (hepatocyte-specific marker). RESULTS: The bone marrow stem cells (Thy CD3-CD45RA- cells) accounted for 2.8% of bone marrow cells without red cells. The labeling rate of 10μM PKH26-GL on sorted bone marrow stem cells was about 95%. There were sporadic PKH26-GL-labeled cells among he-patocytes in liver tissue section, and some of the cells expressed albumin. CONCLUSION: Rat bone marrow stem cells can differentiate into hepatocytes in regenerative environment and may participate in liver regeneration after partial hepatectomy.     

Gene expression profile in the regenerating rat liver after partial hepatectomy

BACKGROUND/AIMS: When a loss of hepatic mass occurs, the expression of a large number of genes is either induced or altered, accompanying hepatocyte proliferation. In the present study, we made an in-house cDNA microarray containing 4608 elements (Liver chip), and analyzed extensively gene expression profiles of the regenerating liver after 70% partial hepatectomy (PHx) in rats. METHODS: RNAs were prepared from three rat livers at each time point (taken at 0, 6, 12, 18, 24, 48, 72 h, and 1 week after PHx). Using the liver chip, we performed large-scale analysis of gene expression during liver regeneration. Elements either up- or down-regulated more than twofold at one or more time points were selected. RESULTS: Among the 4608, 382 were identified. Using cluster analysis, we found great similarity between gene-expression profiles at 12 and 18 h after PHx as well as between 48 and 72 h after PHx. We also found that there are at least six distinct temporal patterns of gene expression in the regenerating rat liver after PHx. CONCLUSIONS: These results indicated that microarray analysis is a powerful approach for monitoring molecular events in the regenerating liver.     

Expressed genes in regenerating rat liver after partial hepatectomy

AIM: To reveal the liver regeneration (LR) and its control as well as the occurrence of liver disease and to study the gene expression profiles of 551 genes after partial hepatectomy (PH) in regenerating rat livers. METHODS: Five hundred and fifty-one expressed sequence tags screened by suppression subtractive hybridization were made into an in-house cDNA microarray, and the expressive genes and their expressive profiles in regenerating rat livers were analyzed by microarray and bioinformatics. RESULTS: Three hundred of the analyzed 551 genes were up- or downregulated more than twofolds at one or more time points during LR. Most of the genes were up- or downregulated 2-5 folds, but the highest reached 90 folds of the control. One hundred and thirty-nine of them showed upregulation, 135 displayed downregulation, and up or down expression of 26 genes revealed a dependence on regenerating livers. The genes expressed in 24-h regenerating livers were much more than those in the others. Cluster analysis and generalization analysis showed that there were at least six distinct temporal patterns of gene expression in the. regenerating livers, that is, genes were expressed in the immediate early phase, early phase, intermediate phase, early-late phase, late phase, terminal phase. CONCLUSION: In LR, the number of down-regulated genes was almost similar to that of the upregulated genes; the successively altered genes were more than the rapidly transient genes. The temporal patterns of gene expression were similar 2 and 4 h, 12 and 16 h, 48 and 96 h, 72 and 144 h after PH. Microarray combined with suppressive subtractive hybridization can effectively identify the genes related to LR.