BACKGROUND:Studies have found that vascular endothelial growth factor and hypoxia inducible factor are involved in the development process of osteoarthritis, but their correlation is rarely reported. OBJECTIVE:To observe the expression and correlation of hypoxia inducible factor-2α and vascular endothelial growth factor in chondrocytes of articular cartilages in human osteoarthritis. METHODS: Articular cartilage specimens were colected from 50 patients with knee osteoarthritis undergoing total knee joint replacement. According to the joint Kelgren-Lawrance (K-L) X-ray grouping classification standard, there were 18 cases of K-LIII level and 32 cases of K-LIV level. Besides, articular cartilage specimens from 10 patients undergoing amputation for legs tumor or traffic accident served as control group. Hematoxylin-eosin staining, Safranin O-Fast Green staining and Mankin scoring were performed to observe and evaluate the histological characteristics of articular cartilages of each group, immunohistochemical staining was conducted to detect the expression of hypoxia inducible factor-2α and vascular endothelial growth factor in chondrocytes of articular cartilages, and their correlations were analyzed. RESULTS AND CONCLUSION:The Mankin score of K-LIV group was significantly higher than those of K-LIII group and control group. Immunohistochemical staining revealed that the number of chondrocytes with positive expression of hypoxia inducible factor-2α or vascular endothelial growth factor in K-LIV group was significantly higher than that in K-LIII group and control group (P < 0.05). The expression of hypoxia inducible factor-2α and vascular endothelial growth factor increased in chondrocytes of articular cartilages of osteoarthritis patients, and to up-regulate the expression of vascular endothelial growth factor may be the regulatory mechanism of hypoxia inducible factor-2αinthe pathogenesis of osteoarthritis.%背景:已有研究发现血管内皮生长因子及低氧诱导因子参与了骨关节炎的发生发展过程,但两者的相关性研究鲜有报道。目的:分析低氧诱导因子2α和血管内皮生长因子在膝骨关节炎患者关节软骨细胞中的表达及相关性。方法:临床收集50例严重膝关节炎接受全膝关节置换患者的膝关节软骨组织标本,根据关节 Kel gren- Lawrance(K-L)X射线分级标准进行分组,其中K-LⅢ级组18例,K-LⅣ级组32例;另取10例因下肢肿瘤或车祸而截肢患者的正常膝关节(K-L分级均为0级)软骨组织标本作为对照组。在苏木精-伊红和Safranin O- Fast Green染色下进行Mankin整体评分比较各组关节软骨退变程度,免疫组织化学染色检测关节软骨组织细胞中低氧诱导因子2α和血管内皮生长因子的表达,并比较它们的相关性。结果与结论:K-LⅣ级组Mankin整体评分高于K-LⅢ级组和K-L 0级组。免疫组织化学染色显示K-LⅣ级组关节软骨细胞中低氧诱导因子2α和血管内皮生长因子的阳性细胞计数均高于K-LⅢ组和K-L 0级(P<0.05)。低氧诱导因子2α和血管内皮生长因子蛋白在骨关节炎患者关节软骨细胞中表达明显增加,提示低氧诱导因子2α可能上调了靶基因血管内皮生长因子的表达,从而加速了骨关节炎的发生发展。
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