title: Down-regulation of the ErbB3 binding protein 1 in human bladder cancer promotes tumor progression and cell proliferation.
abstract: The ErbB3 binding protein 1 (Ebp1) represents a downstream effector of the ErbB signaling network and has been demonstrated to be a potent tumor suppressor in various human malignancies, however, its involvement in human bladder cancer is still unclear.To investigate the clinical significance and potential role of ErbB3 binding protein 1 (Ebp1) in bladder cancer. Ebp1 expression at protein and gene levels in 52 surgically removed bladder cancer specimens as well as 21 adjacent normal bladder specimens were respectively detected by immunohistochemistry and qRT-PCR. The association of Ebp1 protein expression with the clinicopathological features of bladder cancer was also statistically analyzed. Its roles in bladder cancer cell line were further evaluated. The expression level of Ebp1 protein and gene in bladder cancer tissues was significantly lower than that in adjacent normal bladder tissues (P < 0.01). When categorized into low vs. high expression, the down-regulation of Ebp1 protein was associated with the advanced pathologic stage (P = 0.036) and the high histologic grade (P = 0.001) of patients with bladder cancer. Moreover, following the transfection of Ebp1 in bladder cancer cells, not only cell proliferation and cell invasion decreased significantly, but also the cell cycle was blocked at G0/G1 stage. Our data suggest for the first time that the down-regulation of Ebp1 closely correlates with advanced clinicopathological characteristics of human bladder cancer. Furthermore, Ebp1 plays an important role in the bladder cancer cells' proliferation by regulating the cancer cell cycle from G0/G1 to S.
authors.affiliation: Department of Urology, Guangdong Key Laboratory of Clinical Molecular Medicine and Diagnostics, Guangzhou First People's Hospital, Guangzhou Medical University, Guangzhou 510180, China.
authors.forename: Hui-chan
authors.initials: HC
authors.lastname: He
authors.forename: Xiao-hui
authors.initials: XH
authors.lastname: Ling
authors.forename: Jian-guo
authors.initials: JG
authors.lastname: Zhu
authors.forename: Xin
authors.initials: X
authors.lastname: Fu
authors.forename: Zhao-dong
authors.initials: ZD
authors.lastname: Han
authors.forename: Yu-xian
authors.initials: YX
authors.lastname: Liang
authors.forename: Ye-han
authors.initials: YH
authors.lastname: Deng
authors.forename: Zhuo-yuan
authors.initials: ZY
authors.lastname: Lin
authors.forename: Guo
authors.initials: G
authors.lastname: Chen
authors.forename: Yan-fei
authors.initials: YF
authors.lastname: Chen
authors.forename: Ru-jun
authors.initials: RJ
authors.lastname: Mo
authors.forename: Wei-de
authors.initials: WD
authors.lastname: Zhong
mesh_terms: D048868:Adaptor Proteins, Signal Transducing / Q000235:genetics / Q000378:metabolism*; D000256:Adenoviridae / Q000235:genetics; D000368:Aged; D000369:Aged, 80 and over; D059447:Cell Cycle Checkpoints / Q000235:genetics; D045744:Cell Line, Tumor; D002465:Cell Movement / Q000235:genetics; D049109:Cell Proliferation; D018450:Disease Progression; D015536:Down-Regulation; D005260:Female; D015870:Gene Expression; D015972:Gene Expression Regulation, Neoplastic; D005822:Genetic Vectors / Q000235:genetics; D006801:Humans; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D016601:RNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D014161:Transduction, Genetic; D001749:Urinary Bladder Neoplasms / Q000235:genetics / Q000378:metabolism* / Q000473:pathology
chemical_list: D048868:Adaptor Proteins, Signal Transducing; C101633:PA2G4 protein, human; D016601:RNA-Binding Proteins