Transcriptional suppression of the transferrin gene by hypolipidemic peroxisome proliferators

R. Hertz, M. Seckbach, M. M. Zakin, J. Bar-Tana*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

74 Scopus citations

Abstract

Activation of gene expression by hypolipidemic peroxisome proliferators (e.g. native and substituted long chain fatty acids, aryloxyalkanoic fibrate drugs) is accompanied by transcriptional suppression of liver transferrin gene in treated animals or human hepatoma cell line. Transcriptional suppression of liver transferrin by hypolipidemic peroxisome proliferators results from (a) displacement of hepatic nuclear factor (HNF)-4 from the transferrin promoter by nonproductive binding of the peroxisome proliferator- activated receptor-retinoic acid X receptor heterodimer to the (-76/-52) PRI promoter element of the human transferrin gene and (b) suppression of liver HNF-4 gene expression by hypolipidemic peroxisome proliferators with e concomitant decrease in its availability for binding to the transferrin PRI promoter element. HNF-4 gene suppression end its displacement from the transferrin promoter result in eliminating HNF-4-enhanced transcription of transferrin. Liver transferrin suppression by hypolipidemic peroxisome proliferators may result in reduced iron availability as well as modulation of transferrin-induced differentiation processes. Transcriptional suppression of HNF-4-enhanced liver genes (e.g. apolipoprotein C-III, transferrin) may complement the pleiotropic biological effect exerted by hypolipidemic peroxisome proliferators.

Original languageEnglish
Pages (from-to)218-224
Number of pages7
JournalJournal of Biological Chemistry
Volume271
Issue number1
DOIs
StatePublished - 1996

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