title: Vitamin D3 upregulated protein 1 suppresses TNF-α-induced NF-κB activation in hepatocarcinogenesis.
abstract: Vitamin D(3) upregulated protein 1 (VDUP1) is a candidate tumor suppressor, the expression of which is dramatically reduced in various tumor tissues. In this study, we found that VDUP1 expression is suppressed during human hepatic carcinogenesis, and mice lacking VDUP1 are much more susceptible to diethylnitrosamine-induced hepatocarcinogenesis compared with wild type mice. VDUP1-deficient tumors proliferated significantly more than wild type tumors and had corresponding changes in the expression of key cell cycle regulatory proteins. In addition, the hepatomitogen-induced response was associated with a considerable increase in the release of TNF-α and subsequent enhancement of NF-κB activation in VDUP1-deficient mice. When cells were treated with TNF-α, the VDUP1 level was markedly reduced, concomitant with elevated NF-κB activation. Furthermore, the overexpression of VDUP1 resulted in the robust suppression of TNF-α-activated NF-κB activity via association with HDAC1 and HDAC3. These results indicate that VDUP1 negatively regulates hepatocarcinogenesis by suppressing TNF-α-induced NF-κB activation.
authors.affiliation: Bio-Evaluation Center, Korea Research Institute of Bioscience and Biotechnology, Chungbuk, South Korea.
authors.forename: Hyo-Jung
authors.initials: HJ
authors.lastname: Kwon
authors.forename: Young-Suk
authors.initials: YS
authors.lastname: Won
authors.forename: Hyun-Woo
authors.initials: HW
authors.lastname: Suh
authors.forename: Jun-Ho
authors.initials: JH
authors.lastname: Jeon
authors.forename: Yan
authors.initials: Y
authors.lastname: Shao
authors.forename: Suk-Ran
authors.initials: SR
authors.lastname: Yoon
authors.forename: Jin-Woong
authors.initials: JW
authors.lastname: Chung
authors.forename: Tae-Don
authors.initials: TD
authors.lastname: Kim
authors.forename: Hwan-Mook
authors.initials: HM
authors.lastname: Kim
authors.forename: Ki-Hoan
authors.initials: KH
authors.lastname: Nam
authors.forename: Won-Kee
authors.initials: WK
authors.lastname: Yoon
authors.forename: Dae-Ghon
authors.initials: DG
authors.lastname: Kim
authors.forename: Jeong-Hwan
authors.initials: JH
authors.lastname: Kim
authors.forename: Young-Sung
authors.initials: YS
authors.lastname: Kim
authors.forename: Dae-Yong
authors.initials: DY
authors.lastname: Kim
authors.forename: Hyoung-Chin
authors.initials: HC
authors.lastname: Kim
authors.forename: Inpyo
authors.initials: I
authors.lastname: Choi
mesh_terms: D000818:Animals; D006528:Carcinoma, Hepatocellular / Q000378:metabolism*; D002352:Carrier Proteins / Q000378:metabolism*; D024202:Electrophoretic Mobility Shift Assay; D004789:Enzyme Activation / Q000502:physiology; D006801:Humans; D007150:Immunohistochemistry; D047468:Immunoprecipitation; D020287:In Situ Nick-End Labeling; D008113:Liver Neoplasms / Q000378:metabolism*; D051379:Mice; D018345:Mice, Knockout; D008856:Microscopy, Fluorescence; D016328:NF-kappa B / Q000378:metabolism*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015398:Signal Transduction / Q000502:physiology; D013879:Thioredoxins / Q000378:metabolism*; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism*
chemical_list: D002352:Carrier Proteins; D016328:NF-kappa B; D014409:Tumor Necrosis Factor-alpha; C445672:Txnip protein, mouse; D013879:Thioredoxins