【摘要】 目的:探讨胶质瘤细胞egr-1基因表达水平与肿瘤恶性程度、细胞增殖活性及凋亡程度的关系。方法:用原位杂交、原位细胞凋亡检测和免疫组化染色方法观察了73例不同级别的胶质瘤。结果:73例胶质瘤egr-1 mRNA和EGR-1蛋白阳性表达率均为100%,这两种阳性肿瘤细胞密度均随肿瘤恶性程度升高而相应增加,不同级别组间比较差异均有显著性(P<0.01)。73例胶质瘤增殖细胞核抗原(PCNA)阳性肿瘤细胞和凋亡肿瘤细胞检出率均为100%。随肿瘤恶性程度升高,PCNA阳性肿瘤细胞密度增加而凋亡肿瘤细胞密度减少,不同级别组间比较差异均有显著性(P<0.05～0.01)。经直线相关分析证实,egr-1 mRNA、EGR-1蛋白和PCNA阳性肿瘤细胞密度彼此间均呈显著性正相关(r=0.685～0.999,P<0.01),前三种阳性肿瘤细胞密度均与凋亡肿瘤细胞密度呈显著性负相关(r=-0.758～-0.775,P<0.01)。结论:egr-1基因表达水平对评价胶质瘤生物学行为有重要参考价值。胶质瘤细胞egr-1基因表达异常增加可能是促进肿瘤细胞增殖和抑制其凋亡的重要因素,并在胶质瘤发生及恶性进展过程中均起重要作用。更多还原

【Abstract】 Objective:To investigate the relationship between the expression level of early growth response gene-1(egr-1) in human glioma,and the tumor grade,cell proliferation and apoptosis of the tumors.Methods:Seventy-three human glioma specimens with different grades of malignancy were studied using in situ hybridization,in situ cell death detection(TUNEL method) and immunohistochemistry.Results:All of the 73 gliomas expressed egr-1 mRNA and EGR-1 protein(100%) .Not only was the positive cell density of egr-1 mRNA and EGR-1 protein increased with the degree of tumor malignancy but also their expression differences were significant among groups of grade-Ⅰ to Ⅱ,Ⅲ and Ⅳ(P<0.01) .Both the expression of proliferating cell nuclear antigen(PCNA) and tumor-cell apoptosis were detected in all of the 73 glioma cases(100%) .The PCNA-positive tumor cells were increased but apoptotic tumor cells decreased with an enhancement of the tumor malignancy.There were significant differences among the glioma cases of various malignant grades(P<0.05～0.01) .The positive cell density of egr-1 mRNA expression,EGR-1 protein and PCNA protein were positively correlated with one another(r=0.685～0.999,P<0.01) .However,each one of them was negatively correlated with the number of apoptotic tumor cells(r=-0.758～-0.775,P<0.01) .Conclusion:These results suggest that the expression level of egr-1 mRNA has potential value in the evaluation of biological behavior of gliomas.Overexpression of the egr-1 gene in glioma cells could possibly promote cell proliferation,inhibit apoptosis and play an important role in the development and malignant progression of glioma.更多还原