Abstract:
:The upstream transcription control region of the rat alpha-fetoprotein (AFP) gene was analyzed using transient expression of CAT genes in HepG2 cells which express the gene; H4C3 cells which repress the AFP gene but express the albumin gene; and four nonexpressing cell lines. Deletion analysis based on the DNA sequence resolved three upstream enhancers corresponding to the mouse AFP enhancers, but showed additional weak effects from flanking sequences. Quantitative experiments demonstrated that the three enhancers were additive when acting through a single promoter and did not confirm the presence of a distal upstream repressor. All three enhancers stimulated the AFP, albumin, or thymidine kinase (tk) promoter in HepG2, but only the tk and albumin promoters in H4C3. Deletion of a proximal repressor region near the AFP promoter allowed expression in H4C3 cells with the AFP promoter. Thus, the liver-specific developmental repressor is near the AFP promoter, and H4C3 cells provide an in vitro system for analysis of this repressor in transfection assays. The repressor region also blocked expression of the SV40 enhancer through the AFP promoter in hepatic and nonhepatic cell lines, but when this enhancer was combined with an AFP promoter from which the repressor region was deleted, the combination showed expression in all six cell lines studied. AFP expression results from a combination of enhancer, promoter, and repressor activities, and the repressor is functional with a heterologous enhancer in a variety of cells.
journal_name
DNA Cell Bioljournal_title
DNA and cell biologyauthors
Wen P,Groupp ER,Buzard G,Crawford N,Locker Jdoi
10.1089/dna.1991.10.525subject
Has Abstractpub_date
1991-09-01 00:00:00pages
525-36issue
7eissn
1044-5498issn
1557-7430journal_volume
10pub_type
杂志文章abstract::Sterol regulatory element-binding proteins (SREBPs) are transcription factors governing transcription of genes related to cholesterol and fatty acid metabolism. To become active, SREBPs must undergo a proteolytic cleavage to allow an active NH(2)-terminal segment to translocate into the nucleus. SKI-1/S1P is the first...
journal_title:DNA and cell biology
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journal_title:DNA and cell biology
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journal_title:DNA and cell biology
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journal_title:DNA and cell biology
pub_type: 杂志文章
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journal_title:DNA and cell biology
pub_type: 杂志文章
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