Abstract:
:Hepatocyte growth factor (HGF) is an important multifunctional cytokine whose gene expression is regulated mainly at the transcriptional level. Previous studies using transgenic mice as well as in vitro analyses showed that a potential regulatory element(s) exists between -260 to -230 bp in the upstream region of the HGF gene promoter. In the present study, we have discovered that this region is a composite site through which members of the nuclear factor 1 (NF1) and upstream stimulatory factor (USF) families bind to and regulate HGF gene transcription. Gel mobility shift and supershift assays revealed that USF and NF1 have high binding affinity for this region and that the binding sites of the two different transcription factor families overlap. Functional studies showed that NF1 suppresses HGF gene promoter activity and that USF has an activating function. We found that the NF1/X and NF1/Red1 isoforms strongly suppressed HGF promoter activity while the NF1/L variant had no obvious effects. USF1, but not USF2, of the USF family stimulated HGF gene promoter activity. More interestingly, during liver regeneration after partial hepatectomy, a process which activates the HGF gene, we noted that the binding activity of USF to the HGF promoter element increased while that of NF1 decreased. These data provide insight into the molecular mechanisms that govern HGF gene transcription. Oncogene (2000).
journal_name
Oncogenejournal_title
Oncogeneauthors
Jiang JG,Gao B,Zarnegar Rdoi
10.1038/sj.onc.1203581subject
Has Abstractpub_date
2000-05-25 00:00:00pages
2786-90issue
23eissn
0950-9232issn
1476-5594journal_volume
19pub_type
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