血小板反应素-4在胃癌中的表达及其临床意义

Clinical significance of thrombospondin 4 expression in gastric carcinoma

目的定量测定血小板反应素-4(TSP-4)基因在胃癌及癌旁组织中的表达,探讨其与胃癌临床病理学特征、微血管密度(MVD)和基质金属蛋白酶-9(MMP-9)表达水平的关系,评价其在胃癌发生和发展中的意义。方法采用RT-PCR技术检测82例配对的胃癌组织及癌旁组织TSP-4mRNA的表达,并分析其与临床病理学特征的关系;通过免疫组织化学检测肿瘤组织中CD34和MMP-9的表达,分析TSP-4mRNA的表达与肿瘤微血管密度、MMP-9表达的相关性。结果TSP-4mRNA在胃癌中的表达高于癌旁组织(P=0.03);胃癌组织中TSP-4mRNA的表达水平与肿瘤大小、组织分型、淋巴结转移、肿瘤微血管密度及MMP-9表达密切相关(P=0.002,P=0.031,P=0.014,r=0.67P<0.01,P=0.008),但与性别、年龄及侵袭程度无关(P=0.53,P=0.57,P=0.15)。结论TSP-4可能通过调节胃癌新血管生成和MMP-9的表达,促进肿瘤生长与转移。

Objective The aim of this study was to measure quantitatively the TSP-4 mRNA expression and its significance in gastric carcinoma was evaluated by correlating its expression with clinicopathological features, microvessel density（MVD） and MMP-9. Methods Eighty-two patients with gastric carcinoma were recruited in this study. TSP-4 mRNA expression in gastric carcinoma and adjacent tissue was detected by real-time PCR. CD34 and MMP-9 protein expression were examined by immunohistochemistry. MVD was determined according to CD34-positive tubular structures. Results The expression level of TSP-4mRNA in gastric carcinoma was obviously higher than those of adjacent tissue（P = 0.03 ） and it was associated with tumor size, histological type, lymph node metastasis, MVD and MMP-9 （ P = 0. 002, P = 0.031, P=0.014,r=0.67 P〈0. 01, P=0.008）,but not sex, age and depth of invasion. （P=0.53,P=0.57,P= 0.15）. Conclusion TSP-4 may play an important role in occurrence and progression of gastric carcinoma and that the effect of TSP-4 on tumor growth and metastasis may be exerted through regulation of angiogenesis and MMP-9 expression in gastric carcinoma.