脑星形细胞瘤组织中肝细胞生长因子及其受体的表达

目的探讨肝细胞生长因子(HGF)mRNA及其受体(c-Met)mRNA在脑星形细胞瘤组织中的表达规律,及其与肿瘤增殖、肿瘤血管生成、临床病理及预后之间的关系。方法用原位杂交法检测76例脑星形细胞瘤组织标本HGFmRNA、c-MetmRNA的表达;用免疫组化法检测增殖细胞核抗原(PCNA)及CD34在肿瘤中的表达,计算微血管密度(MVD),并结合临床和病理资料进行分析。结果HGFmRNA、c-MetmRNA、PCNA在低级别脑星形细胞瘤组织中阳性率分别为34·5%、44·8%和15%±9%,在高级别脑星形细胞瘤组织中阳性率分别为74·5%、78·7%和48%±12%(P<0·05),MVD在低级别和高级别脑星形细胞瘤组织中分别为17个±7个和31个±13个(P<0·05),与患者的性别、年龄、肿瘤部位、肿瘤直径无显著相关(P>0·05);c-Met表达与HGF、PCNA的表达及MVD呈显著相关;Cox回归多因素分析显示,病理级别、肿瘤部位、HGF、c-Met、PCNA和MVD6个因素对星形细胞瘤患者生存期的影响具有统计学意义。结论HGF/c-Met在星形细胞瘤的形成与发展过程中起重要作用,它可促进肿瘤增殖及瘤组织内微血管的发生,并对其预后判断有指导意义。

The expression of hepatocyte growth factor and its receptor in brain astrocytomas

OBJECTIVE: To investigate the expression of hepatocyte growth factor (HGF) mRNA and its receptor (c-Met) mRNA in brain astrocytomas and their relationships with tumor proliferation, angiogenesis, clinical pathology and prognosis. METHODS: The expression of HGF mRNA, c-Met mRNA in the resected tumor tissues of 76 patients with brain astrocytomas, 43 males and 33 females, aged 20 - 71, were detected by in situ hybridization. Immunohistochemistry technique was used to test the expression of proliferating cell nuclear antigen (PCNA) protein and the microvessel density (MVD) was determined by immunohistochemistry with monoclonal antibody against CD34. RESULTS: The positive rates of expression of HGF, c-Met and PCNA in low pathologic grades of brain astrocytoma were 34.5%, 44.8% and 15% +/- 9% respectively, and in high pathologic grades of brain astrocytoma were 34.5%, 44.8% and 48% +/- 12% respectively (P < 0.05). MVD in low and high pathologic grades of brain astrocytoma were 17 +/- 7 and 31 +/- 13 respectively (P < 0.05). The expression of HGF, c-Met, PCNA and CD34 was not related to sex, age, position of tumor and diameter of tumor. The expression of c-Met was related to the expression of HGF, PCNA and the MVD in the tumor tissues of these patients. The pathological grade, position of tumor, HGF, c-Met, PCNA, MVD had a significant influence on the survival time. CONCLUSION: HGF/c-Met plays an important role in the formation and progression of the brain astrocytoma and can promote tumor proliferation and intratumoral microvascular formation, and is closely related to the prognosis of the patients.