目的探讨白细胞介素8(IL-8)mRNA、增殖细胞核抗原(PCNA)在星形细胞肿瘤组织中的表达及其与细胞凋亡之间的关系。方法应用RT—PCR方法检测64例星形细胞肿瘤组织及10例正常大脑组织中IL-8 mRNA的表达情况。用免疫组织化学方法检测PCNA在肿瘤组织石蜡标本中的表达,并用TUNEL法检测肿瘤细胞的凋亡。结果星形细胞肿瘤组织中IL-8mRNA表达与星形细胞肿瘤的恶性程度有关。随着肿瘤恶性程度的增高,PCNA表达增高,细胞凋亡指数增高。IL-8mRNA表达与PCNA表达呈正相关关系(r=0.938,P〈0.01),与细胞增殖亦呈正相关关系(r=0.907,P〈0.01)。结论IL-8 mRNA表达与星形细胞肿瘤的恶性增殖呈正相关,星形细胞肿瘤通过抑制凋亡并且上调IL-8分泌促进肿瘤细胞增殖,从而导致肿瘤恶性转化。
Objective To investigate the expressions of interleukin-8 (IL-8) mRNA and proliferating cell nuclear antigen (PCNA) protein in astrocytic tumors and their correlation with the tumor cell apoptosis. Methods The expressions of IL-8 mRNA in 64 cases of astrocytic tumor and 10 normal brain tissues were detected using RT-PCR. The expression of PCNA protein in the tumors was assayed with immunohistochemistry, and the apoptosis index (AI) of the tumor cells determined using TUNEL assay. Results The expression ofIL-8 mRNA in the astrocytic tumors was strongly correlated to the malignancy of the tumors, and both the PCNA expression and the apoptosis index increased in tumors of greater malignancies. IL-8 mRNA expression was positively correlated to the expression of PCNA (r=0.938, P〈0.01) and AI (r=0.907, P〈0.01) in these tumors. Conclusion IL-8 mRNA expression is positively correlated to the histological grade of the astrocytic tumors, whose proliferation is mediated by inhibition of cell apoptosis and upregulation of IL-8 transcription.