中文摘要：

背景：当肝脏受到严重损伤或肝脏大部分缺失时,肝干细胞迅速分裂增殖向成熟肝细胞分化修复肝组织,但肝再生是一个复杂的多信号分子调控的过程,参与调控的相关基因及蛋白质目前尚不十分清楚。目的：观察大部分肝切除后大鼠肝再生组织中CD34蛋白、Delta-like-1蛋白的表达变化。方法：切除2/3肝脏建立大鼠肝再生动物模型,应用苏木精-伊红染色、酶组织化学染色、免疫组织化学染色方法在不同时间点检测肝再生组织中ATP酶、增殖细胞核抗原、CD34、Delta-like-1蛋白的表达情况。结果与结论：在肝再生的启动阶段ATP酶表达下调,CD34、Delta-like-1表达上调;在肝再生的持续增殖阶段,ATP酶表达上调到正常水平,CD34、Delta-like-1表达下调;增殖细胞核抗原表达为持续上调。说明ATP酶、CD34、Delta-like-1在不同阶段表达不同,提示在肝再生过程中各信号分子的协同作用及Notch-Delta信号通路参与其作用机制。

英文摘要：

BACKGROUND：When the liver affected severe damage or excalation, liver stem cells rapidly proliferated and differentiated into mature liver cells to repair liver tissue. However, liver regeneration is a complicated multiple signal molecular regulatory process and related genes and proteins that participated in regulation remain unclear. OBJECTIVE： To investigate the expressions of CD34 and Delta-like-1 protein in rat liver regenerated tissues after partial hepatectomy. METHODS：Rat hepatic regeneration models were established after hepatectomy. Expressions of ATPase, proliferating cell nuclear antigen （PCNA）, CD34 and Delta-like-1 protein were detected by hematoxylin-eosin staining, enzyme-histochemistry and immunohistochemistry method at various time points. RESULTS AND CONCLUSION：At the early stage of liver regeneration, the expression of ATPase was down-regulated, and the expressions of CD34 and Delta-like-1 protein were up-regulated. At the middle stage, the expression of ATPase was increased to the normal level, and the expressions of CD34 and Delta-like-1 protein were down-regulated. The expression of PCNA protein was continuously up-regulated. These suggest that the expressions of ATPase, CD34 and Delta-like-1 protein were different at different stages of hepatic regeneration, which means that different signal molecules were cooperated during the hepatic regeneration, and Notch-Delta signal pathway takes part in the pathogenesy.