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. 1994 Sep 15;302(Pt 3):943–948. doi: 10.1042/bj3020943

Expression of the phosphoenolpyruvate carboxykinase gene in 3T3-F442A adipose cells: effects of retinoic acid and differentiation.

J Antras-Ferry 1, S Franckhauser 1, D Robin 1, P Robin 1, D K Granner 1, C Forest 1
PMCID: PMC1137321  PMID: 7945224

Abstract

3T3-F442A adipocytes express the gene encoding cytosolic phosphoenolpyruvate carboxykinase (GTP) (PEPCK). Retinoic acid (RA) caused a 5-fold induction of PEPCK mRNA within 6 h in these cells with a half-maximal effective concentration of approximately 75 microM. This effect was independent of cycloheximide and inhibited by actinomycin D. In vitro run-on experiments using isolated nuclei confirmed that the RA-induced increase was mainly due to an increased rate of transcription of the gene. Stable transfectants bearing either the region of the PEPCK promoter from -2100 to +69 fused to the chloramphenicol acetyltransferase (CAT) gene (pPL1-CAT) or -600 to +69 fused to CAT (pPL9-CAT) were used to study PEPCK gene regulation during differentiation. The same transfected cells were used to analyse the RA effect. Preadipocytes containing pPL1-CAT expressed a much lower level of CAT activity than did adipocytes. pPL9-CAT was not expressed in either preadipocytes or adipocytes. RA induced the expression of CAT activity in preadipocytes and adipocytes transfected with pPL1-CAT, but had no effect in cells transfected with pPL9-CAT. These results suggest that one or more DNA sequences located between -2100 and -600 bp of the PEPCK promoter is required for adipocyte-specific expression of this gene. RA action is independent of the state of differentiation and appears to require different elements in fat cells from those required in liver.

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Selected References

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