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二甲基亚硝胺所致大鼠肝硬化形成与逆转过程中Thy1.1与 OV6 阳性染色细胞比较
http://www.100md.com 2005年4月15日 《世界华人消化杂志》 2005年第8期
     朱英,刘平,龙爱华,上海中医药大学肝病研究所 上海市 201203

    吴云林,上海第二医科大学附属瑞金医院消化科 上海市 200025

    肖家诚,上海第二医科大学附属瑞金医院病理科 上海市 200025

    朱英,女, 1965-05-02生, 江苏无锡人,汉族.1989年锦州医学院本科毕业,2001年大连医科大学硕士研究生毕业,副主任医师, 现于上海中医药大学肝病研究所攻读博士学位, 主要研究肝脏纤维化的中西医结合治疗.

    国家杰出青年科学基金资助项目,NO. 39825128

    通讯作者:刘平, 201203, 上海市张江蔡伦路1200号,上海中医药大学肝病研究所. liuliver@online.sh.cn
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    收稿日期:2004-12-17 接受日期: 2005-02-16

     Comparison of Thy1.1 with OV6 in hepatic oval cell marking duringformation and reversion of rat cirrhosis induced by dimethylnitrosamine

    Ying Zhu, Ping Liu, Ai-Huan Long, Yun-Lin Wu, Jia-Cheng Xiao

    Ying Zhu, Ping Liu,Ai-Huan Long, Institute of Liver Diseases, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China
, 百拇医药
    Yun-Lin Wu,Department of Digestion, Ruijin Hospital, the Second Medical University of Shanghai, Shanghai 200025, China

    Jia-Cheng Xiao,Department of Pathology, Ruijin Hospital, the Second Medical University of Shanghai, Shanghai 200025, China

    Supported by National Excellent Youth Science Foundation of China, No. 39825128

    Correspondence to: Dr. Ping Liu, Institute of Liver Diseases, Shanghai University of Traditional Chinese Medicine, 1200 Cailun Road, Zhangjiang, Shanghai 201203, China. liuliver@online.sh.cn
, 百拇医药
    Received: 2004-12-17 Accepted: 2005-02-16

     Abstract

    AIM:
To screen the best marker for hepatic oval cells (HOC) by comparing the dynamic changes of Thy1.1 and OV6 expression in the hepatic tissue during the formation and reversion of dimethylnitrosamine (DMN)-induced cirrhosis in rats.

    METHODS: Rat cirrhosis model was induced by DMN treatment (12 times in 4 weeks). The degree of liver fibrosis was determined by collagen staining. The expression of OV6 and Thy1.1 in various hepatic cells were examined by immunohistochemistry. Thy1.1 positive cells were enumerated under light microscope, and the cell protein was quantified by Western blot.
, 百拇医药
    RESULTS: The most typical cirrhosis in the model was observed at the 4th week after DMN injection, which was combined with large area of hemorrhage and putrescence. These changes started to alleviate at the 6th week with a few incomplete fiber septa. The inflammation was lessened distinctly at the 8th week, mainly manifested as incomplete fiber septa. OV6 positive cells were presented in both HOC and normal cholangial epithelia. There were no Thy1.1 positively stained cells in the normal tissues. Very few Thy1.1 positive cells started to appear on the 3rd day, dispersed at the 2nd week, increased significantly at the 4th week around the fiber septa,reached the peak at the 6thweek (i.e. 2 week after stopping DMN injection) which was distributedmainly in the periportal district, and decreased at the 8th week. The results of Western blot and the number of HOC were consistent with each other.
, 百拇医药
    CONCLUSION: During the formation and reversion of the rat cirrhosis, Thy1.1 is superior to OV6 in marking HOC with better specificity and sensitivity.

    Key Words: Thy1.1; OV6; Hepatic oval cell; Rats, Liver cirrhosis; Dimethylnitrosamine

    Zhu Y, LiuP, Long AH, Wu YL, Xiao JC. Comparison of Thy1.1 with OV6 in hepatic oval cell marking during formation and reversion of rat cirrhosis induced by dimethylnitrosamine. Shijie Huaren Xiaohua Zazhi 2005;13(8):953-957
, 百拇医药
    摘要

    目的:
在二甲基亚硝胺(dimethylnitrosamine, DMN)致大鼠肝硬化形成与消减过程中,比较Thy1.1与OV6标记肝脏卵圆细胞(hepatic oval cells, HOC)的不同变化,从而选择最佳的HOC标记物.

    方法:应用DMN 腹腔注射(4 wk12次)制备大鼠肝硬化模型,进行胶原组织染色动态观察肝纤维化程度,免疫组化检测Thy1.1和OV6的不同阳性染色细胞表达,光镜下进行Thy1.1标记的HOC计数,western blot进行该标记细胞的蛋白定量测定.

    结果: DMN造模4 wk大鼠已形成典型的肝硬化;终止造模后2 wk、即6 wk时肝组织病变较4 wk时有所减轻出现不完全纤维间隔.8 wk时炎症明显减轻并以不完全纤维间隔为主. OV6在各时间点除了卵圆细胞表达外,也于正常胆管上皮细胞表达.正常大鼠肝组织未见到Thy1.1阳性染色的细胞,3 d时可见卵圆细胞微量表达,2 wk时呈散在分布,4 wk时明显增多,见于纤维间隔周围,终止造模后2 wk、即第6 wk时阳性染色显著强于4 wk,大量出现于汇管区,8 wk时较6 wk有所减少,表达量基本与4 wk时相等.Thy1.1标记的HOC Western blot 结果与细胞计数一致.
, 百拇医药
    结论:在DMN大鼠肝硬化形成与消减过程中,Thy1.1标记肝脏卵圆细胞优于OV6,具有特异性和敏感性.

    关键词:Thy1.1; OV6; 肝脏卵圆细胞; 大鼠; 肝硬化; 二甲基亚硝胺

    朱英, 刘平, 龙爱华, 吴云林, 肖家诚. 二甲基亚硝胺所致大鼠肝硬化形成与逆转过程中Thy1.1 与OV6 阳性染色细胞比较. 世界华人消化杂志 2005;13(8):953-957

    : 正常大鼠,肝组织汇管区见少量胶原纤维;B: DMN造模3 d,可见出现出血坏死灶,仅在汇管区和中央静脉壁见少量胶原纤维; C:DMN模型4 wk,胶原纤维大量沉积,成完全间隔包绕肝组织形较多的假小叶; D:模型 6 wk、即终止DMN造模后2wk,肝纤维化略有减轻,但仍有较多的完全纤维间隔.E: 模型8 wk,肝纤维化明显减轻,呈不完全纤维间隔.
, 百拇医药
    图2 DMN肝硬化大鼠肝Thyl.1免疫组织化学阳性染色的动态变化(×400).A: 正常大鼠,未见阳性染色;B: DMN造模3 d,微量阳性细胞染色; C: DMN造模4wk,阳性细胞染色显著增多,主要出现于纤维间隔周围,所形成的胆管上皮细胞也有染色.D: 6 wk、即终止DMN造模后2 wk,汇管区出现大量阳性染色细胞,形成团簇样并形成胆小管.E: 模型8 wk,阳性染色细胞较6 wk时减少,散在分布.

    图3 DMN肝硬化大鼠肝OV6免疫组织化学阳性染色的动态变化(×400). A:阴性对照大鼠,未见阳性染色;B: DMN造模3 d,可见正常胆管上皮细胞及少许阳性细胞染色; C:DMN造模4 wk,除了正常胆管上皮细胞染色之外,阳性细胞染色显著增多,主要出现于纤维间隔周围.D: 终止DMN造模后2wk,出现大量散在的阳性染色细胞.E: 终止DMN造模后4wk,阳性染色细胞减少.

, http://www.100md.com     图4 (PDF) Westernblot: 正常组无表达,3d微弱表达,2 wk有所增加,4wk明显增加,6 wk达高峰,8 wk开始下降至4wk水平.

    图5 (PDF) 胶原纤维半定量分析: 正常组无胶原存在,3 d开始胶原量逐渐增加,于4wk达高峰,之后于6wk和8 wk逐渐下降.

    图6 (PDF) HOC记数:正常组无该细胞,3 d时出现少量该细胞,于2wk和4 wk逐渐增加,于6wk达高峰,8wk下降相当于4wk和6 wk水平.

    3 讨论 DMN制备的肝硬化大鼠模型,肝脏组织学动态观察结果显示,在造模4 wk时已形成典型的肝硬化,在终止DMN造模后其肝组织病理改变有所缓解,终止造模后2 wk,肝组织纤维间隔变细,部分呈现为不完全纤维间隔,8 wk肝组织纤维化程度已见明显减轻,以不完全纤维间隔为多见;这一动态的变化过程为我们提供了分析探讨肝硬化消减的病理生理反应的良好模型.OV-6可识别正常大鼠肝脏的胆管细胞和结节中肝细胞,但主要识别致癌物处理肝脏中的卵圆细胞,在人类肝脏由OV-6识别的抗原决定簇的细胞分布比大鼠复杂得多.在观察人类肝脏生长、分化和损伤中,他能够鉴别所公认的祖代细胞和所产生的亚群(OC.2、OC.3).并且在即往的很多动物实验研究中也应用该指标作为HOC的鉴别标准.
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    Thy-1是用来鉴别造血干细胞的种系特异性标志物.Thy-1在CD34阳性细胞中表达最高,并且当造血干细胞开始表达其分化细胞类型(如CD45RA,CD38,和CD71)时,他的表达开始下降[3].Thy-1在大鼠造血干细胞的表达强于小鼠和人,除了造血系统外,还在大脑、乳房等的上皮细胞表达Thy-1抗体能够刺激细胞内的Ca2+释放和胞质蛋白质磷酸化,参与细胞的识别、黏附和T细胞的激活.Thy-1不在成年肝脏正常表达,但在胎肝中表达,而且在被损害肝脏的表达仅限于肝脏中被激活的卵圆细胞.大鼠实验表明卵圆细胞表达高水平的Thy-1,同时也表达AFP、GGT、CK-19、OC.2和OV-6等所有已知鉴别卵圆细胞的标志物[4-5].

    我们应用OV6和Thy1.1作为HOC的标志物进行酶免疫组化的观测结果显示,OV6在各时间点除了在HOC表达外,在正常胆管上皮细胞也表达.而Thy1.1阳性细胞表达量在DMN大鼠肝硬化形成与消减的动态演变过程中呈现出随着肝硬化形成而逐渐增加,肝硬化消减早期表达量剧增的特征性变化.在正常对照大鼠的肝组织内未见到阳性表达,DMN腹腔注射3 d后,大鼠肝组织内即可见到阳性表达,其后随着造模时间的延长,阳性表达逐渐增强,终止造模因子DMN刺激后2 wk,其表达量达到高峰,在终止造模后4 wk,又恢复到造模4 wk时的水平.这一变化特征不仅在肝组织内阳性染色与阳性细胞计数呈现一致性,且在Western blot分析结果中得到进一步证实.Thy1.1阳性细胞在肝组织内表达部位,造模3 d时主要位于汇管区,造模2 wk时出现散在的阳性染色细胞,为胞质染色;造模4 wk时阳性染色细胞增多,已出现于纤维间隔周围;6 wk时于汇管区出现大量阳性染色细胞,并形成团簇样并形成新的胆小管,纤维间隔周围染色显著增强;于8 wk时阳性染色细胞开始减少,呈散在分布.实验表明应用Thy-1抗体作为一种鉴别卵圆细胞新的标志物,能够获得大量的卵圆细胞,为HOC特异性的标志物时也已有研究表明,应用流式细胞计数法可以分离到95-97%的纯Thy-1卵圆细胞种群.因此,Thy-1在将来的体内和体外肝卵圆细胞研究中,在细胞分类方面将成为有力的工具.
, 百拇医药
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, 百拇医药
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    5 杨明智, 闵军, 陈积圣, 陈汝福, 彭志海. 体外诱导大鼠骨髓干细胞向肝细胞横向分化.

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    编辑 潘伯荣 审读 张海宁, 百拇医药( 朱 英,刘 平,龙爱华,吴云林, 肖家诚)
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