【摘要】 目的研究环氧合酶-2(cyclooxygenase-2,COX-2)蛋白在不同亚型胃黏膜肠化生(intestinal metaplasia,IM)及胃癌中的表达,探讨其做为预测IM恶变趋势指标的可能性,同时明确COX-2表达与胃癌发生间的关系。方法选择40例慢性萎缩性胃炎(chronic、atrophic gastritis,CAG)伴IM、40例胃癌及相应癌旁组织,构建组织芯片。分别用高铁二铵/爱先蓝(HID/AB)及HE染色对IM及胃癌进行分型,免疫组化检测不同亚型IM及胃癌中COX-2蛋白的表达。结果COX-2蛋白表达阳性率在CAG伴IM灶、癌旁IM灶和肠型胃癌中分别为45.65%、59.38%和77.27%,显著高于弥漫型胃癌(16.67%,P分别<0.05、0.005和0.005),表达强度在CAG伴IM灶→癌旁IM灶→肠型胃癌顺序中呈逐渐升高趋势(P<0.005)。Ⅲ型IM中COX-2表达阳性率显著高于Ⅰ型、Ⅱ型IM(P分别<0.005、0.05),从Ⅰ型、Ⅱ型到Ⅲ型,COX-2表达强度也呈逐渐升高趋势(P<0.005)。结论随着IM愈倾向于恶性,COX-2表达水平也逐渐增高,有可能成为预测IM恶变趋势的有用指标。COX-2表达主要与肠型胃癌的发生有关,但在弥漫型胃癌的发生中可能也有一定作用。更多还原

【Abstract】 Objective: To study the expression of cyclooxygenase-2 (COX-2) protein in different subtypes of intestinal metaplasia (IM) and gastric carcinoma, evaluate the possibility of COX-2 forecasting the risk of malignant potential of IM, and the relationship between COX-2 expression and gastric carcinogenesis. Methods: Forty cases of chronic atrophic gastritis (CAG) with IM, 40 cases of gastric carcinoma and corresponding paracancerous tissues were selected to construct a tissue microarray. High iron diamine/alcian blue (HID/AB) staining and Hematoxylin and Eosin (HE) staining was used to classify IM and gastric carcinoma, and the expression of COX-2 protein detected in different subtypes of IM and gastric cancer by using immunohistochemistry. Results: The positive expression rate of COX-2 was 45.65%, 59.38% and 77.27% in IM foci in CAG, IM foci in paracancerous tissues, and intestinal-type gastric carcinoma, respectively, significantly higher than in diffuse-type gastric cancer (16.67%)(P<0.05, 0.005 and 0.005, respectively), and the expression intensity of COX-2 protein showed a increased tendency gradually in the sequence of IM foci in CAG→IM foci in paracancerous tissues→intestinal-type gastric carcinoma (P<0.005). The positive expression rate of COX-2 protein in type Ⅲ IM was significantly higher than in type Ⅰ and type Ⅱ IM (P<0.005 and 0.05, respectively), and the expression intensity also showed a increased tendency gradually from type Ⅰ to type Ⅲ IM (P<0.005). Conclusion: The expression level of COX-2 was increased gradually along with the increase of the risk of malignancy of IM, and its expression level may be a useful index to forecast the risk of malignant potential of IM. COX-2 expression was associated with intestinal-type gastric carcinoma, but it might also have some role in the carcinogenesis of diffuse-type gastric carcinoma.更多还原