摘要:
背景:倒千里光碱是能长期抑制成熟肝细胞分裂增生的肝化学毒剂.目的:联合应用倒千里光碱和肝脏1/3切除建立肝损伤大鼠模型,肝损伤观察大鼠肝细胞和卵圆细胞增殖情况,以及成熟肝细胞和卵圆细胞与肝脏再生的关系.方法:SD雄性大鼠30只,随机分为2组,每组15只.①倒千里光碱/肝脏1/3切除组:腹腔注射倒千里光碱,30 mg/ kg,共注射2次,每次间隔2周;②1/3肝切除组:用生理盐水代替倒千里光碱.两组大鼠在末次注射4周后行肝脏1/3切除术.观察两组大鼠术后不同时间点肝脏病理形态变化、细胞增殖情况和CK19、C-kit免疫组织化学检测情况.结果与结论:①倒千里光碱/肝脏1/3切除组大鼠术后20 d体质量仍低于术前,肝脏增大明显小于肝脏1/3切除组,苏木精-伊红染色示胞体肿大、胞浆疏松、肝细胞广泛空泡变性,汇管区小胆管周围和肝小叶内可见成簇或散在分布的卵圆细胞增生;②肝脏1/3切除组术后20 d 体质量恢复接近术前,肝脏损害较倒千里光碱/肝脏1/3切除组轻,Brdu免疫荧光示成熟肝细胞大量增生,术后14 d见肝卵圆细胞增生,多出现在肝细胞索中,形态和免疫组织化学标记与倒千里光碱/肝脏1/3切除组卵圆细胞一致;③结果提示,成功构建了倒千里光碱联合肝脏1/3切除的急性肝损伤大鼠模型,实验可见肝脏中毒及中毒后肝干细胞和成熟肝细胞增殖的现象,证实肝细胞更新与损伤后再生是肝流域中肝内外源肝干细胞及成熟肝细胞共同作用的结果.%BACKGROUND: Retrorsine (RS) is a chemical agent for the long-term inhibition of mature liver cell division and proliferation. OBJECTIVE: To establish a rat model of liver injury by combined use of RS and 1/3 partial hepatectomy, to observe the proliferation of liver cells and oval cells in rats after liver injury, and to discuss the relationship between liver regeneration and mature liver cells and oval cells after liver injury. METHODS: Thirty male Sprague-Dawely rats were randomized into two groups (n=15 per group): RS group and control group. Rats in the RS group were subjected to intraperitoneal injection of RS, 30 mg/kg, twice in total, with 2 weeks in between; and rats in the control group were injected physiological saline instead of RS. Four weeks after the last injection, the 1/3 partial hepatectomy was performed in two groups of rats. Liver pathological and morphological changes as well as cell proliferation were observed, and CK19 and C-kit immunohistochemical detections of the rat liver in the two groups were conducted at different time points after operation. RESULTS AND CONCLUSION: At 20 days after operation, the body mass of the RS group rats was still lower than the baseline, and the liver increase was obviously less than that in the control group; there was cell body swelling shown by hematoxylin-eosin staining, loose cytoplasm, extensive vacuoles degeneration of liver cells, and clustered or scattered oval cells around the portal area of small bile duct and in the hepatic lobule. However, in the control group, the body mass was close to the baseline, liver damage was lighter than that in the RS group, a large number of mature liver cells proliferated under BrdU Immunofluorescence at 20 days after operation; liver oval cells proliferated and distributed in the liver cell line at 14 days after operation, with morphology and immunohistochemical markers consistent with oval cells in the RS group. These findings indicate that the rat model of acute liver injury is successfully established by combining retrorsine with 1/3 partial hepatectomy, liver poisoning and the proliferation of liver stem cells and mature liver cells after poisoning can be seen in the experiment, which firmly confirm that liver cell renewal and regeneration after injury is accredited to the combined action of liver stem cells in liver basin and mature liver cells.