CCAAT/enhancer-binding protein-beta participates in insulin-responsive expression of the factor VII gene.
Expression of the human coagulation factor VII (FVII) gene by hepatoma cells was modulated in concert with levels of glucose and insulin in the culture medium. In low glucose medium without insulin, amounts of both FVII mRNA and secreted FVII protein were coordinately increased; in the presence of glucose with insulin, both were decreased. Analysis of the FVII promoter showed that these effects could be reproduced in a reporter-gene system, and a small promoter element immediately upstream of the translation start site of the gene, which mediated these effects, was identified. Mutation of this element largely abrogated the glucose/insulin-responsive change in expression of the reporter gene. Several members of the CCAAT/enhancer-binding protein family were found to be capable of binding the identified sequence element but not the mutated element. The expression of a FVII minigene directed by a segment of the native FVII promoter responded to co-expressed activating and inhibiting forms of CCAAT/enhancer-binding protein beta.
Veterans Affairs Boston Healthcare System, West Roxbury, Massachusetts 02132, USA.
Audrey A
AA
Jackson
Katherine R
KR
Cronin
Roshini
R
Zachariah
Josephine A
JA
Carew
D020121:5' Untranslated Regions; D000818:Animals; D001483:Base Sequence; D022782:CCAAT-Enhancer-Binding Protein-beta / Q000235:genetics / Q000378:metabolism*; D016466:CHO Cells; D006528:Carcinoma, Hepatocellular / Q000378:metabolism / Q000473:pathology; D045744:Cell Line, Tumor; D006224:Cricetinae; D003412:Cricetulus; D004247:DNA / Q000235:genetics / Q000302:isolation & purification; D005167:Factor VII / Q000096:biosynthesis / Q000235:genetics* / Q000378:metabolism; D005786:Gene Expression Regulation / Q000235:genetics*; D017930:Genes, Reporter; D005947:Glucose / Q000235:genetics / Q000378:metabolism; D006801:Humans; D007328:Insulin / Q000235:genetics / Q000378:metabolism*; D008113:Liver Neoplasms / Q000378:metabolism / Q000473:pathology; D008969:Molecular Sequence Data; D011401:Promoter Regions, Genetic; D012333:RNA, Messenger / Q000378:metabolism; D014158:Transcription, Genetic; D014162:Transfection
D020121:5' Untranslated Regions; D022782:CCAAT-Enhancer-Binding Protein-beta; D007328:Insulin; D012333:RNA, Messenger; D005167:Factor VII; D004247:DNA; D005947:Glucose