Title : Suppression of C/EBPalpha and induction of C/EBPbeta by 2,3,7,8-tetrachlorodibenzo-p-dioxin in mouse adipose tissue and liver.

Pub. Date : 1998 May 15

PMID : 9634001






7 Functional Relationships(s)
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1 We examined the effect of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) on two transcription factors, CAAT/enhancer binding protein-alpha (C/EBPalpha) and beta (C/EBPbeta), involved in the coordination of gene expression in adipose and liver. Polychlorinated Dibenzodioxins CCAAT/enhancer binding protein (C/EBP), alpha Mus musculus
2 We examined the effect of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) on two transcription factors, CAAT/enhancer binding protein-alpha (C/EBPalpha) and beta (C/EBPbeta), involved in the coordination of gene expression in adipose and liver. Polychlorinated Dibenzodioxins CCAAT/enhancer binding protein (C/EBP), alpha Mus musculus
3 A single dose of TCDD (100 microg/kg) to male C57BL mice resulted in a time- and dose-dependent decrease in the level of C/EBPalpha mRNA in adipose tissue and liver, and a reciprocal increase in C/EBPbeta mRNA. Polychlorinated Dibenzodioxins CCAAT/enhancer binding protein (C/EBP), alpha Mus musculus
4 Gel shift analysis using hepatic nuclear extracts from control and TCDD-treated mice and an oligonucleotide containing a C/EBP recognition element revealed a time-dependent change in DNA-protein complexes formed. Polychlorinated Dibenzodioxins CCAAT/enhancer binding protein (C/EBP), alpha Mus musculus
5 Gel shift analysis using hepatic nuclear extracts from control and TCDD-treated mice and an oligonucleotide containing a C/EBP recognition element revealed a time-dependent change in DNA-protein complexes formed. Oligonucleotides CCAAT/enhancer binding protein (C/EBP), alpha Mus musculus
6 Bands corresponding to C/EBPalpha, as determined by supershift analysis, diminished in TCDD-treated animals over a 7-day time period, whereas two new bands corresponding to C/EBPbeta, not present in control extracts, were increased significantly in treated samples. Polychlorinated Dibenzodioxins CCAAT/enhancer binding protein (C/EBP), alpha Mus musculus
7 These results showed that TCDD caused rapid, reciprocal changes in C/EBPalpha and C/EBPbeta mRNAs and DNA binding in the adipose and liver of male C57BL mice and induced C/EBPbeta in hepatoma cells in an AhR-dependent manner. Polychlorinated Dibenzodioxins CCAAT/enhancer binding protein (C/EBP), alpha Mus musculus