血管瘤中缺氧诱导因子-1α的表达和血管生成的研究

目的　探讨缺氧诱导因子- 1α(HIF-1α)在血管瘤中的表达以及其和血管内皮细胞生长因子 (VEGF)、新生微血管密度 (MVD)的关系。方法　采用免疫组化SP法检测 2 8例婴幼儿血管瘤中HIF 1α、VEGF的蛋白表达和MVD。结果　 2 8例血管瘤中HIF-1α、VEGF的蛋白表达阳性率分别是6 4 % ,71.4 %。其中增生期和消退期HIF 1α阳性率分别为 87.5 %、33.3% (P <0.0 1) ,VEGF阳性率分别为 93.7%、4 1.7% (P <0.0 1) ;MVD分别为 73 4± 14 6 3、30 2± 9 1(P <0.0 1)。HIF 1α蛋白表达与VEGF成正相关 (P <0.0 1) ,HIF 1α和VEGF与MVD都成正相关 (P <0.0 1)。结论　血管瘤增生期血管内皮细胞存在着特殊的缺氧微环境 ,并通过HIF-1α表达水平提高调节VEGF等血管生成相关因子表达水平升高 ,促进了新生微血管生成

The relationship between the expression of HIF-1 α and the angiogenesis in infancy hemangioma

OBJECTIVE: To investigate the expression of HIF-1alpha and its roles on the vascular endothelial cell growth factor (VEGF) and microvessel density (MVD ) in hemangioma. METHODS: Immunohistochemical streptavidin/peroxidase(SP) stain was applied to examine the expression of HIF-1alpha, VEGF and CD34. The amount of microvessel was counted, which the endothelial cell expressed CD34. RESULTS: The nuclei and cytoplasm of the endothelial cell showed positive staining for HIF-1alpha in hemangioma. In 28 cases, positive rate for HIF-1alpha was 64%, for VEGF was 71.4%. In the proliferating phase, positive rate for HIF-1alpha was 87.5%, for VEGF was 93.7%. However, the positive rate for HIF-1alpha, in the involuting phase, was 33.3%, and for VEGF was 41.7%. There was a very significantly different between two phases (P < 0.01). In the proliferating phase, MVD was 73.4 +/- 14.63 . In the involuting phase, MVD was 30.2 +/- 9.1 (P < 0.01). The correlation between the HIF-1alpha and VEGF was positive (P < 0.01). There was a positive correlation between the HIF-1alpha and MVD (P < 0.01). CONCLUSIONS: There might be a special hypoxia microenvironment in endothelial cell of the hemangioma in proliferating phase , which could up-regulate the expression of the HIF-1alpha protein. The HIF-1alpha protein could also up-regulate the VEGF protein and then result in the angiogenesis.