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Deprecated: Implicit conversion from float 265.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Oncotarget 2016 ; 7 (40): 65403-17 Nephropedia Template TP
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Foxp3 enhances HIF-1? target gene expression in human bladder cancer through decreasing its ubiquitin-proteasomal degradation #MMPMID27557492
Jou YC; Tsai YS; Lin CT; Tung CL; Shen CH; Tsai HT; Yang WH; Chang HI; Chen SY; Tzai TS
Oncotarget 2016[Oct]; 7 (40): 65403-17 PMID27557492show ga
Hypoxia-inducible factor-1? (HIF-1?) can control a transcriptional factor forkhead box P3 (Foxp3) protein expression in T lymphocyte differentiation through proteasome-mediated degradation. In this study, we unveil a reverse regulatory mechanism contributing to bladder cancer progression; Foxp3 expression attenuates HIF-1? degradation. We first demonstrated that Foxp3 expression positively correlates with the metastatic potential in T24 cells and can increase the expression of HIF-1?-target genes, such as vascular endothelial growth factor (VEGF) and glucose transporter (GLUT). Foxp3 protein can bind with HIF-1?, particularly under hypoxia. In vivo ubiquination assay demonstrated that Foxp3 can decrease HIF-1? degradation in a dose-dependent manner. Knocking-down of Foxp3 expression blocks in vivo tumor growth in mice and prolongs mice's survival, which is associated with von Willebrand factor expression. Thirty-three of 145 (22.8 %) bladder tumors exhibit Foxp3 expression. Foxp3 expression is an independent predictor for disease progression in superficial bladder cancer patients (p = 0.032), associated with less number of intratumoral CD8+ lymphocyte. The metaanalysis from 2 published datasets showed Foxp3 expression is positively associated with GLUT?4, ?9, and VEGF-A, B-, D expression. This reverse post-translational regulation of HIF-1? protein by Foxp3 provides a new potential target for developing new therapeutic strategy for bladder cancer.