Abstract | BACKGROUND: METHODS: To investigate the activation or suppression of β- catenin/Tcf transcription, we established a transiently transfected cell line with a constitutively active β- catenin mutant gene whose product is not degraded. This cell line was also co-transfected with luciferase reporter gene constructs containing either an optimized (TOPflash) or mutant (FOPflash) Tcf-binding element. RESULTS: We identified the inhibitory effect of streptonigrin against β- catenin/Tcf signaling in β- catenin activated cells. Streptonigrin inhibited the transcriptional activity of β- catenin/Tcf in SW480 cells and HEK293 cells transiently transfected with a constitutively active mutant β- catenin gene. The growth inhibitory effect of streptonigrin was more evident in β- catenin-activated cancer cells than in non-activated cancer cells. The electrophoresis mobility shift assay showed that the binding of Tcf complexes with their specific DNA-binding sites was suppressed by streptonigrin. CONCLUSION:
Streptonigrin is a negative regulator of β- catenin/Tcf signaling, and their inhibitory mechanism is related to the proliferation inhibitory effect on β- catenin-activated cancer cells. GENERAL SIGNIFICANCE:
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Authors | Seyeon Park, Sohyun Chun |
Journal | Biochimica et biophysica acta
(Biochim Biophys Acta)
Vol. 1810
Issue 12
Pg. 1340-5
(Dec 2011)
ISSN: 0006-3002 [Print] Netherlands |
PMID | 21763403
(Publication Type: Journal Article)
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Copyright | 2011 Elsevier B.V. All rights reserved. |
Chemical References |
- DNA Primers
- TCF Transcription Factors
- beta Catenin
- Streptonigrin
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Topics |
- Base Sequence
- Blotting, Western
- Cell Line
- Cell Proliferation
(drug effects)
- DNA Primers
- Electrophoretic Mobility Shift Assay
- Humans
- Real-Time Polymerase Chain Reaction
- Signal Transduction
(drug effects)
- Streptonigrin
(pharmacology)
- TCF Transcription Factors
(metabolism)
- beta Catenin
(metabolism)
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