Abstract
Growth of solid tumor depends on angiogenesis, a process regulated by the balance of pro- and anti-angiogenic factors. We investigated the expression of anti-angiogenic factor pigment epithelium-derived factor (PEDF) and proangiogenic factors vascular endothelial growth factor (VEGF) and matrix metalloproteinase-9 (MMP-9) with immunohistochemistry in 64 bladder tumor samples and 23 normal controls. Compared with normal urothelium, we identified decreased PEDF expression (P = 0.000) whereas increased expression of VEGF (P = 0.000) and MMP-9 (P = 0.000) in tumorous tissue as well as in papillary urothelial neoplasm of low malignant potential (PUNLMP) (P = 0.009 and P = 0.000 accordingly) but MMP-9 (P = 0.704). Decreased PEDF expression was revealed with higher tumor grade (P = 0.014) but stage (P = 0.687). There was no age or gender preference in PEDF, VEGF or MMP-9 expression. Negative correlation of expression in tumorous and cancerous tissue regarding PEDF and VEGF (P = 0.000, r = −0.56, and P = 0.000, r = −0.50, respectively), PEDF and MMP-9 (P = 0.002, r = −0.39, and P = 0.032, r = −0.30, respectively) was identified. There was a negative correlation of expression between PEDF and VEGF (P = 0.016, r = −0.677) and no correlation between PEDF and MMP-9 (P = 0.147, r = −0.45) in PUNLMP. Decreased PEDF and increased VEGF and MMP-9 expression may play considerable roles in differentiation and invasion of bladder tumor.
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Acknowledgments
We hereby owe our thanks to Dr ZHOU Zhong-wen and Mr ZHU Teng-fang for excellent technical support. This work was supported in part by Science and Technology Commission of Shanghai Municipality, China (No. 07ZR14018).
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Feng, Cc., Ding, Q., Zhang, Yf. et al. Pigment epithelium-derived factor expression is down-regulated in bladder tumors and correlates with vascular endothelial growth factor and matrix metalloproteinase-9. Int Urol Nephrol 43, 383–390 (2011). https://doi.org/10.1007/s11255-010-9834-4
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DOI: https://doi.org/10.1007/s11255-010-9834-4