Abstract:
:To investigate mechanisms of rat glutathione S-transferase P1 gene (rGSTP1) expression regulation during chemical carcinogenesis. we studied enhancer elements located in the region between -2.5 kb to -2.2 kb. The region was upstream from the start site of transcription and was divided into two major fragments, GPEI and GPEII. The GPEII fragment was further divided into two smaller fragments, GPEII- I and GPEII-2. Using a luciferase reporter system, we identified a strong enhancer of GPEI and a weak enhancer of GPEII in HeLa and a rat hepatoma cell line CBRH79 19 cell. The enhancer of GPEII was located within the GPEII-I region. Chemical stimulation by glycidyl methatylate (GMA) and phorbol 12-o-tetradecanoate 13-acetate (TPA) analysis revealed that induction of rGSTP1 expression was mainly through GPEI. Although H2O2 could enhance GPEII enhancer activity, the enhancement is not mediated by the NF-kappaB factor that bound the NF-kappaB site in GPEII. Using electrophoretic mobility shift assays (EMSA) and the UV cross-linking assays, we found that HeLa and CBRH7919 cells had proteins that specifically bound GPEI core sequence and a 64 kDa protein that interacted with GPEII-1. The cells from normal rat liver did not express the binding proteins. Therefore, the trans-acting factors seem to be closely related to GPEI, GPEII enhancer activities and may play an important role in high expression of rGSTPI gene.
journal_name
Mol Biol Repjournal_title
Molecular biology reportsauthors
Liu D,Liao M,Zuo J,Henner WD,Fan Fdoi
10.1023/a:1011993604051keywords:
subject
Has Abstractpub_date
2001-03-01 00:00:00pages
19-25issue
1eissn
0301-4851issn
1573-4978journal_volume
28pub_type
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