肝细胞癌中uPA和MMP-9的表达及其意义
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摘要
背景与目的:肝细胞癌(hepatocellular carcinoma,HCC,以下简称肝癌)为我国常见的恶性肿瘤,门静脉内生长和肝内转移是肝癌的生物学特征之一。肿瘤首先在肝内直接蔓延,也可在肝内沿门静脉分支转移,使肝内出现多处转移结节。肝外转移通过淋巴道,可转移至相关淋巴结。晚期亦可通过肝静脉转移至远处脏器,预后不佳。肿瘤的浸润转移是各种恶性肿瘤预后差的重要因素之一。肿瘤细胞的浸润和转移过程依赖于各种蛋白质水解系统的协同作用。其中,尿激酶型纤溶酶原激活物(urokinaseplasminogen activator,uPA)系统和金属蛋白酶(matrixmetalloproteirlases,MMPs)发挥了重要作用。uPA、金属蛋白酶-9(matrixmetalloproteinases-9,MMP-9)是降解细胞外基质(extracellufarmatrix,ECM)最重要的酶类之一,二者又与新生血管的形成,细胞间的黏附作用联系紧密。有研究表明,二者在肿瘤细胞的侵袭过程起着协同所用。但二者在肝癌中的联合表达情况,及它们与病理、临床相关指标的联系目前尚无报道。本课题通过研究uPA和MMP-9在肝癌中的表达情况,从而探讨uPA和MMP-9在肝癌发生、发展中的作用及其意义。
     材料和方法:收集广西医科大学肝胆外科2004年12月—2006年4月45例肝癌病人的手术切除标本及对应的癌旁组织和相关临床资料,7例肝血管瘤的瘤旁肝组织作为对照组。用逆转录酶聚合酶链反应(reversetranscription polymerase chain reaction,RT-PCR)方法检测uPA和MMP-9在上述标本中的mRNA表达情况,并用凝胶扫描仪进行电泳条带强度分析;用免疫组织化学法(immunohistochemical method)检测uPA和MMP-9在上述标本中的蛋白表达情况,并由两名病理科医师采用双盲法阅片和评分。同时将实验结果与病理、临床资料(伴有静脉癌栓及肝内外转移形成、乙型肝炎病毒感染、病理分级、血清AFP水平、肿瘤直径)进行比较分析。
     结果:
     1,RT-PCR检测45例肝癌组织uPA mRNA阳性率为100%(45/45),相对应的癌旁组织阳性率为84.44%(38/45);对照组阳性率为28.57%(2/7)。三组比较均有显著性差异(P<0.01,P<0.05)。uPA mRNA在肝癌组织中的阳性表达率与静脉癌栓形成、肝内外转移明显有关(P<0.01),而与乙型肝炎病毒(hepatitis B virus,HBV)感染、病理分级、血清AFP水平以及肿瘤直径无明显关系(P>0.05)。
     2,RT-PCR检测45例肝癌组织MMP-9 mRNA阳性率为100%(45/45),相对应的癌旁组织阳性率为86.67%(39/45);对照组阳性率分别为57.14%(4/7);三组比较均有显著性差异(P<0.05,P<0.01)。MMP-9 mRNA在肝癌组织中的阳性表达率与静脉癌栓形成、肝内外转移明显有关(P<0.01),而与HBV感染、病理分级、血清AFP水平以及肿瘤直径无明显关系(P>0.05)。
     3,免疫组化检测uPA蛋白在肝癌中的阳性率为75.56%(34/45),明显高于癌旁(26.67%,12/45)及对照组(28.57%,2/7),三组比较有显著性差异(P<0.01,P<0.05)。并且uPA蛋白的表达与静脉癌栓形成、肝内外转移明显有关(P<0.01),而与HBV感染、病理分级、血清AFP水平以及肿瘤直径无明显关系(P>0.05)。
     4,免疫组化检测MMP-9蛋白在肝癌中的阳性率为66.67%(30/45),明显高于癌旁(22.22%,10/45)及对照组(14.29%,1/7),三组比较有显著性差异(P<0.01,P<0.05)。并且MMP-9蛋白的表达与静脉癌栓形成、肝内外转移明显有关(P<0.01),而与HBV感染、病理分级、血清AFP水平以及肿瘤直径无明显关系(P>0.05)。
     5,经Spearman等级相关分析,uPA和MMP-9的mRNA和蛋白表达水平之间呈正相关关系(分别为mRNA,r_s=0.749,P<0.01;蛋白,r_s=0.475,P<0.01)。
     结论:研究结果显示,uPA和MMP-9在肝癌组织中呈高表达状态,这种高表达与肝癌的静脉癌栓形成和转移有关。对二者联合检测可能有助于提示早期发现肝癌的浸润和转移,在判断肝癌病人的预后和转归方面有一定作用。
Background ang Objective:Hepatocellular carcinoma(HCC)is one of the most common malignant tumors in China.The one of biologic features of HCC is the tumore cells growing in portal vein and metastasising in the liver.HCC first invades surrounding tissue or metastasizes within the liver.Then,HCC may also metastasize to lymph node through lymphatic pathway or to other organs through hematogenous pathway in advanced stage.Invasion and metastasis are the one of the reasons of poor prognosis of HCC,and this process is related to the protease system,Urokinase plasminogen activator(uPA) system and matrix metalloproteinases(MMPs)play a important role in the process.It was proven that uPA and matrix metalloproteinases-9 (MMP-9)are the most important erzymes in degrada extracellular matrix(ECM),they also association with angiogenesis and adhesion between ceils.But the combine expression of these two molecules in HCC,their relationship with pathology and clinic are unknown.In the present study,We would like to explore the expression of uPA and MMP-9 in HCC,and their effect and significance in the development of HCC.
     Materials and Methods:All of the 45 surgical specimens of HCC and their adjacent liver tissues(from Dec.2004 to Apr.2006)were obtained from the department of liver and gall surgery of the first hospital affiliated to GuangXi Medical University,7 cases of adjacent liver tissues from hemangiomas of liver(as control group). Reverse transcription polymerase chain reaction(RT-PCR)and immunohistochemistry were used to detect the expression of uPA and MMP-9 in this specimens.The results were used to analyse the relationship between the expression of uPA and MMP-9 in HCC and the information of pathology and clinic(including the portal vein tumor thrombus, the presence of metastasis,hepatitis B virus,pathological stage, the level of serum alpha-fetoprotein(AFP)and the diameter of tumor).
     Results:
     1.RT-PCR was used to detect the expression of uPA in 45 cases.The positive rate of uPA mRNA in HCC was 100%(45/45),the rates of their adjacent liver tissues and the control group were 84.44%(38/45)and 28.57%(2/7)respectively(P<0.01,P<0.05).The positive rate of u-PA mRNA in HCC was significantly correlated with the portal vein tumor thrombus,the presence of metastasis(P<0.01),but not correlated with the hepatitis B virus,pathological stage,the level of serum AFP and the diameter of tumor(P>0.05)
     2.RT-PCR was used to detect the expression of MMP-9 in 45 cases.The positive rate of MMP-9 mRNA in HCC was 100%(45/45),the rates of their adjacent liver tissues and the control group were 86.67%(39/45)and 57.14%(4/7)respectively(P<0.05,P<0.01).the positive rate of MMP-9 mRNA in HCC was significantly correlated with the portal vein tumor thrombus,the presence of metastasis(P<0.01),but not correlated with the hepatitis B virus,pathological stage,the level of serum alpha-fetoprotein(AFP)and the diameter of tumor(P>0.05)
     3.Immunohistochemistry revealed that,among 45 cases,the positive rates of uPA protein were 75.56%(34/45)in HCC,26.67%(12/45) in their adjacent liver tissues,and 28.57%(2/7)in the control group, respectively(P<0.05,P<0.01).In addition,the positive rate of uPA protein in HCC was significantly correlated with the portal vein tumor thrombus,the.presence of metastasis(P<0.01),but not correlated with the hepatitis B virus,pathological stage,the level of serum alpha-fetoprotein(AFP)and the diameter of tumor(P>0.05).
     4.Immunohistochemistry revealed that,among 45 cases,the positive rates of MMP-9 protein were 66.67%(30/45)in HCC, 22.22%(10/45)in their adjacent liver tissues,and 14.29%(1/7)in the control group,respectively(P<0.01,P<0.05).In addition,the positive rate of MMP-9 protein in HCC was significantly correlated with the portal vein tumor thrombus,the presence of metastasis(P<0.01),but not correlated with the hepatitis B virus,pathological stage,the level of serum alpha-fetoprotein(AFP)and the diameter of tumor(P>0.05)
     5.By Spearman correlation analysis,the expression of uPA and MMP-9 mRNA.is positively correlation(r_s=0.749,P<0.01),the expression of uPA and MMP-9 protein is also positively correlation(r_s =0.475,P<0.01)
     Conclusions:The high level of expression of u-PA and MMP-9 in HCC might be related to the growth、invasion and metastasis of HCC,and they might be used as markers of prognosis of HCC in clinical practice.
引文
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