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HGF对VP-16诱导肝癌细胞凋亡及bcl-2基因表达的影响
http://www.100md.com 1997年8月15日 《世界华人消化杂志》 1997年第8期
     第二军医大学 1长征医院消化科 2基础部病理解剖教研室

    3东方肝胆外科医院 上海市 200003

    杨秀疆,男,1960-10-05生,重庆市人,汉族. 1984年重庆中国人民解放军第三军医大学毕业,第二军医大学长征医院消化内科博士研究生,发表论文12篇.

    项目负责人 杨秀疆,上海市凤阳路415号第二军医大学长征医院消化内科.

    Tel: 021-63275997-362

    收搞日期 1996-08-16 接受日期 1996-11-01

    Effect of HGF on etoposideinduced apoptosis and bcl-2 gene expression for hepatocellular carcinoma
, 百拇医药
    
Xiu-Jiang Yang1, Shi-Bao Chen1, Jian-Zhong Bao2, Yi Wang3, Zhong-Bing Zhang1, Xian-Kan Zhang1 and Xing-Rong Zhang11Department of Gastroenterology, Changzheng Hospital

    2Department of Pathology, 3Eastern Hepatobiliary Surgical Hospital, Second Military Medical University, Shanghai 200003, China

    Abstract
, 百拇医药
    AIM
To study the hepatocyte growth factor (HGF) in etoposide (VP-16)-induced apoptosis and bcl-2 gene.

    METHODS Apoptosis (hepatic cancer cell line, SMMC-7721) was in duced by VP-16 (0.5, 1, 5μM/L), HGF (10, 20, 30μg/L)+VP-16 (0.5μM/L) and physiological salt solution served as control. The morphology of apoptosis was o bserved by HE staining. By Western blot, the expressions of bcl2 and PCNA prot ein were analyzed in induced apoptosis.
, 百拇医药
    RESULTS Apotosis was found after 5h, 7 days and 72h in VP-16 5μM/L, 0.5μM/L and HGF (10, 20, 30μg/L)+VP-16 (0.5μM/L) groups, respectively. It was not killed completely by single 0.5μM/L VP16 after 7 days. Western blot analysis of bcl-2 showed that the expressions were reduced in VP-16 5μM/L group for 24h, 1μM/L for 72h, HGF+VP-16 for 96h, respectively. No expression of the oncoprotein was seen after 120h. The expressions of PCNA were the highest in VP-16+HGF group.
, 百拇医药
    CONCLUSION HGF might improve etoposideinduced apoptosis in hepatic carcinoma cells. The proliferating carcinoma cells may be regulated, and bcl-2 gene altered by their combination.

    Subject headings Hepatocyte growth factor/pharmacology; Etoposide/pharmacology; Apoptosis/drug effects; Liver neoplasms/drug the rapy; Proto_oncogenes/drug effects; Gene/expression/drug effects

    Yang XJ, Chen SB, Bao JZ,Wang Y, Zhang ZB, Zhang XK,Zhang XR.Effect of HGF on etoposide-induced apoptosis and bcl-2 gene expression for hepatocellular carcinoma.Xin Xiaohuabingxue Zazhi,1997;5(8):518-519
, 百拇医药
    目的 研究肝细胞生长因子(HGF)对VP-16诱导肝癌细胞凋亡及bcl-2基因表达的影响.

    方法 我们用VP-16联合HGF处理肝癌SMMC-7721细胞. 肝癌细胞处理分3组:VP-16(0.5,1,5μM/L); HGF(10,20,30μg/L)+VP-16(0.5μM/L);生理盐水对照组. Western blot分析bcl-2及核增殖抗原(PCNA)表达,DNA凝胶电泳,倒置显微镜及HE染色观察细胞形态.

    结果 应用VP-165μM/L,0.5μM/L,HGF+VP-16,细胞凋亡分别在5h,7d和72h后发生,单用0.5μM/L VP-16诱发凋亡不明显. DNA电泳∶0.5~1μM/L VP-16处理1h对DNA无影响,24h时1μM/L和5μM/L组DNA在180bp左右形成条带. 36h后,HGF+VP-16 0.5μM/L组也在180bp处集中. Western blot:SMMC-7721细胞均不同程度表达PCNA,VP-16+HGF组表达量最高. bcl-2在5μM/L组处理后24h,1μM/L组72h,HGF+VP-16(0.5μM/L)96h表达下降,120h后未见表达.
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    结论 HGF促进VP-16诱发肝癌细胞凋亡,两者合用能够调节癌细胞增生及引起bcl-2基因表达改变.

    主题词 肝细胞生长因子/药理学 依托泊甙/药理学 脱噬作用/药物作用 肝肿瘤/药物疗法 原癌基因/药物作用 基因表达/药物作用

    杨秀疆,陈士葆,宝建中,王一,张忠兵,张贤康,张兴荣.HGF对VP-16诱导肝癌细胞凋亡及bcl-2基因表达的影响.新消化病学杂志,1997;5(8):518-519

    细胞凋亡(apoptosis)在癌放疗及化疗中具有重要作用,疗效与调亡密切相关[1]. bcl_2基因可抑制多种细胞形成凋亡,在某些肿瘤细胞中该基因表达上调,使肿瘤细胞逃逸死亡和寿命延长[2]. 肝细胞生长因子能明显刺激细胞分裂、增殖,促进肝细胞分化. 对于肿瘤细胞可分别产生抑制和生长作用,能抑制肝癌细胞的生长[3]. 应用VP-16诱导后,以肝细胞生长因子进一步刺激,有可能加强肝癌细胞的诱导凋亡效应及影响凋亡相关基因的表达. 作者报道应用VP-16+HGF两者处理肝癌细胞(SMMC_7721)出现的凋亡及引起的bcl_2表达变化.
, 百拇医药
    1 材料和方法1.1 肝癌细胞 SMMC_7721为传代肝癌细胞株(本校病理教研室建系). PRMI_1640,10%小牛血清孵育,隔天换液. 长至对数期,分别用下述处理:①生理盐水对照组;②HSS(肝细胞生长刺激物质,本校高分子生物实验室生产),HGF(Sigma)10,20,30μg/L;3)VP-16(etoposide,上海浦东制药厂),0.5,1和5μM/L组,预处理60min后洗去,分别加生理盐水,HGF各剂量组持续处理,1,24,48,72h及96h直至7d,作细胞倒置显微镜观察和HE染色.

    1.2 方法 ①DNA电泳:按《分子克隆实验指南》[4],取TBS洗处理后细胞,以缓冲液收集细胞并匀浆,快速酚氯法抽提DNA,2%琼脂糖(上海东风化工厂)加EB电泳,紫外线投射仪(上海长明光学电子仪器厂)观察并拍照. ②Western blot:以90mm大平皿用上法处理细胞,上样缓冲液(85℃预热)收集细胞,12% SDS_PAGE凝胶电泳(SDS,过硫酸胺购自华美生物工程公司),双丙酰胺,TEMED(Sigma产品),DTT,甘氨酸(上海东风化工厂),按《分子克隆指南》作聚丙酰烯胺电泳(电泳仪,江苏兴化市生产,垂直电泳槽,上海求精仪器厂). 电泳4h,凝胶以石墨电极板硝酸纤维素膜转移(硝酸纤维素膜,0.4U,浙江黄岩化工厂),转移毕丽春红-S染色条代清晰,加下述一抗:bcl_2,PCNA(DAKO产品,华美生物工程公司分装),5%脱脂奶粉1∶80稀释,0.1ml/cm,4℃温育过夜,PBS洗涤,NaCl_Tris液洗,滴加二抗羊抗鼠_HRP(华美公司产品),DAB显色.
, 百拇医药
    图1 肝癌凋亡细胞倒置显微镜改变

    2 SMMC-7721凋亡细胞DNA电泳

    3 PCNA癌基因蛋白印渍改变

    4 凋亡细胞的bcl_2蛋白印滞改变

    2 结果细胞培养,VP-16 5μM/L,0.5μM/L组细胞细胞凋亡分别在5h,7d后发生,24h时1μM/L可见约20%细胞呈凋亡表现(图1),而5μM/L者几乎全部细胞死亡,各者处理1h细胞均无凋亡表现. HGF(10,20,30μg/L)+VP-16 0.5μM/L组72h后随HGF剂量增加凋亡逐渐增加,表现为生长素的特有刺激表现,呈扁平状生长,发生调亡时细胞核相对变小胞体变圆. 生理盐水及单用HGF处理组均无明显凋亡发生,HGF不引起细胞数增加. DNA电泳:单用0.5μM/L~1μM/L VP-16处理1h对DNA无影响,24h时1μM/L和5μM/L组DNA在180bp左右 形成条带.36h后,HGF+VP-16 0.5μM/L组也在180bp处集中(图2). Western blot: SMMC-7721细胞均不同程度表达PCNA,VP-16+HGF组表达量最高(图3). bcl_2在5μM/L组处理后24h,1μM/L组72h,HGF+VP-16(0.5μM/L)96h表达下降,120h后未见表达. HGF及单用0.5μM/L组对bcl_2影响不大(图4).
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    3 讨论本结果表明,用VP-16短暂处理后继之以HGF刺激,SMMC-7721癌细胞呈扁平状生长,72h后出现明显细胞凋亡,随作用时间延长及HGF剂量加大,作用变强. 肝细胞生长因子增加了VP-16对肝癌细胞诱导凋亡作用. VP-16可与DNA链形成复合物引起DNA单链短暂断裂,导致基因表达改变[5]. 有报道EGF在不同细胞可分别诱导凋亡及减轻凋亡. Liu等[6]作肝癌细胞免疫组化显示其met基因表达下降. HGF对相同起源的正常和恶性肿瘤为何表现出相反的作用,其机制仍不清楚,相似的表现在许多正常和对应的新生细胞中观察到[7]. 本结果有类似表现,SMMC-7721细胞由对HGF无刺激反应转向促进凋亡,提示VP-16能够诱导SMMC-7721细胞对HGF产生反应可能增强凋亡效应. bcl_2对抗多种刺激诱发细胞凋亡. 但不少研究指出,bcl_2下调有利凋亡形成. 给红白血病撤除IL-3处理引发TF-1细胞凋亡并伴有bcl_2基因表达下降[8]. 本结果提示,经VP-16联合HGF能够影响bcl_2的表达,在近完成或引起大量凋亡时bcl_2呈表达下降,其下调对形成SMMC-7721细胞的凋亡起有利作用.
, 百拇医药
    4 参考文献1 Korsmeyer SJ. Regulators of cell death. TIG, 1995;11(3):101-105

    2 Packham G, Cleveland JL. c-Myc and apoptosis. Biochimica et Biophysica Acta “Reviews on Cancer”, 1995;1242(1):11-28

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    Biochimica et biophsica Acta “Reviews on Cancer”, 1993;1155(4):357-371
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    4 金冬雁,黎孟枫译. 分子克隆实验指南. 北京:科学出版社,1993:304

    5 Hashimooto H, Chatterjee S, Berger NA. Inhibition of etoposde_induced DNA recombination and mutant frequency by bcl_2 protein

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    6 Liu ML, Mars WM, Michalopoulos GK. Hepatocyte growth factor inhibits cell proliferation in vivo of rat hepatocellular carcinomas induced

, 百拇医药     by diethylnitrosamine. Carcinogenesis, 1995;16(4):841-843

    7 Shiota G, Rhoads DB, Wang TC, et al. Hepatocyte growth factor inhibits growth of hepatocellular carcinoma cells. Proc Natl Acad Sci

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    8 Rinaudo MS, Su K, Falk LA, et al. Human interleukin_3 receptor modulates bcl_2 mRNA and protein levels through protein kinase C in

    TF_1 cells. Blood, 1995;86(1):80-88, http://www.100md.com