Abstract：
:The gadd45 gene, a growth arrest and DNA damage (gadd)-induced gene, is transcriptionally activated by UV irradiation through two distinct pathways. One requires the sequence-specific binding of the p53 tumor suppressor protein to a responsive element within the third intron of the gadd45 gene, and the other is p53-independent activation of the gadd45 promoter region, although the UV-response element that mediates this has yet to be defined. To investigate the sequences involved in induction of gadd45 by UV irradiation in a p53-independent pathway, we performed mutation analyses of the human gadd45 promoter fused to the luciferase reporter gene in cell lines in which p53 was inactivated. We found that the UV-responsive element was involved in the Oct-1 binding site at -99 bp relative to the transcription start site. Electrophoretic mobility shift assays showed that Oct-1, a transcription factor, bound this element on the gadd45 gene, although the intensity and mobility pattern of the retarded bands were not altered by UV irradiation. These results suggest that the Oct-1 regulatory element might be one of the essential elements involved in the activation of the gadd45 promoter by UV irradiation in a p53-independent pathway.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Takahashi S,Saito S,Ohtani N,Sakai Tsubject
Has Abstractpub_date
2001-02-01 00:00:00pages
1187-95issue
3eissn
0008-5472issn
1538-7445journal_volume
61pub_type
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