MMP9及VEGF誘導(dǎo)血管生成在中耳膽脂瘤增殖中的作用
[Abstract]:Objective: to use CD105 as a microvascular marker. Ki-67 was used as the index of cholesteatoma proliferation to study the role of microvascular formation in cholesteatoma and the role of MMP9 and VEGF in inducing angiogenesis in cholesteatoma in order to reveal the pathogenesis of cholesteatoma. And to provide theoretical and clinical basis for its prevention and treatment. Methods: the expression of MMP9,VEGF,Ki-67 and CD105 in 45 cases of middle ear cholesteatoma and 10 cases of normal external auditory canal skin were detected by immunohistochemical staining. Image-Pro plus6.0 image analysis software was used to read the average optical density of MMP9,VEGF protein from cholesteatoma and normal skin samples of external auditory canal and count MVD to evaluate microangiogenesis. Results: 1. The new microvessels in middle ear cholesteatoma were abundant and dense, and showed abnormal morphologic changes. The average MVD of 45 cases of middle ear cholesteatoma was 28.3 鹵7.7 and the average MVD of normal skin of external auditory canal was 6.1 鹵2.5. The difference between the two groups was statistically significant (t = 8.905, p 0.001). 2the positive expression rate of Ki-67 protein in middle ear cholesteatoma was significantly higher than that in normal skin of external auditory canal (蠂 2 7.305 P 0.01). With the increase of microvessel density (MVD) in subepithelial connective tissue of cholesteatoma, the positive expression rate of Ki-67 in cholesteatoma was also increased. 3. The average optical density of VEGF protein in middle ear cholesteatoma was (0.3816 鹵0.04205), and that in normal skin of external auditory canal was (0.2106 鹵0.02105). There was significant difference between the two groups (t = 4.804, p0.01). With the increase of average optical density of VEGF, microvessel density (MVD) around the epithelial matrix of cholesteatoma increased accordingly. (4) the average optical density of MMP9 protein in middle ear cholesteatoma was (0.2816 鹵0.04103), and that in normal skin of external auditory canal was (0.2016 鹵0.01803). There was significant difference between the two groups (t = 3.184, p 0.01). The microvessel density (MVD) around the epithelial matrix of cholesteatoma increased with the increase of the average optical density of MMP9. 5. The correlation analysis showed that VEGF and MMP9 had synergistic effect on angiogenesis (r 0.851P 0.000). Conclusion: 1. Microvascular hyperplasia exists in subepithelial connective tissue of middle ear cholesteatoma. 2. The epithelial cells of cholesteatoma have strong proliferative activity, and the microvascular hyperplasia in the subepithelial connective tissue of cholesteatoma can provide abundant blood supply and nutrition for the abnormal high proliferation of cholesteatoma epithelium. 3Angiogenesis induced by MMP9 and VEGF proteins plays an important role in the proliferation of middle ear cholesteatoma, while MMP9 and VEGF have synergistic effect in inducing angiogenesis of cholesteatoma.
【學(xué)位授予單位】:福建醫(yī)科大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2010
【分類號(hào)】:R764.29
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