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Overexpression of USF increases TGF-beta1 protein levels, but G1 phase arrest was not induced in FRTL-5 cells

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Authors
Kim, Keun-Sook; Jung, Hye Seung; Chung, Yun Jae; Jung, Tae Sik; Jang, Hye Won; Lee, Myung-Shik; Kim, Kwang-Won; Chung, Jae Hoon
Issue Date
2008-10-29
Publisher
Korean Academy of Medical Science
Citation
J Korean Med Sci. 2008 Oct;23(5):870-6.
Keywords
Animals*ApoptosisBinding SitesCell CycleCell LineG1 Phase*Gene Expression RegulationPromoter Regions, GeneticProtein BiosynthesisRatsThymidine/chemistryTransfectionTransforming Growth Factor beta1/metabolismUpstream Stimulatory Factors/*metabolism
Abstract
Transforming growth factor-beta1 (TGF-beta1) is a potent inhibitor of cellular growth and proliferation by G1 phase arrest or apoptosis. We investigated the association of TGF-beta1 with the anti-proliferative effect of upstream stimulatory factor (USF) in Fischer rat thyroid cell line (FRTL-5) cells. [methyl-(3)H] thymidine uptake was measured after treatment of FRTL-5 cells with TGF-beta1 to identify its anti-proliferative effect. USF-1 and USF-2 proteins were in vitro translated, and an electrophoretic mobility shift assay was performed to identify the interaction between USF and the TGF-beta1 promoter. FRTL-5 cells were transfected with USF cDNA, and then the expression of TGF-beta1 was examined with Northern and Western blotting. The cell cycle-regulating proteins associated with TGF-beta1 were also measured. TGF-beta1 significantly inhibited [methyl-(3)H] thymidine uptake in FRTL-5 cells. Two specific binding sites for USF were found in the TGF-beta1 promoter: -1,846 approximately -1,841 (CACATG) and -621 approximately -616 (CATGTG). Overexpression of USF increased both the mRNA levels and protein levels of TGF-beta1. However, the expression of cyclin D1, CDK4, cyclin E, and CDK2, and the phosphorylation of retinoblastoma protein remained unchanged. Overexpression of USF in FRTL-5 cells increased the expression of TGF-beta10 through specific binding to TGF-beta1 promoter. However, the USF-induced expression of TGF-beta1 did not cause G1 arrest.
ISSN
1011-8934 (Print)
Language
English
URI
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=18955796

http://synapse.koreamed.org/Synapse/Data/PDFData/0063JKMS/jkms-23-870.pdf

http://hdl.handle.net/10371/46310
DOI
https://doi.org/10.3346/jkms.2008.23.5.870
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College of Medicine/School of Medicine (의과대학/대학원)Internal Medicine (내과학전공)Journal Papers (저널논문_내과학전공)
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