The PPARgamma2 A/B-domain plays a gene-specific role in transactivation and cofactor recruitment.
We have previously shown that adenoviral expression of peroxisome proliferator-activated receptors (PPARs) leads to rapid establishment of transcriptionally active complexes and activation of target gene expression within 5-8 h after transduction. Here we have used the adenoviral delivery system combined with expression array analysis to identify novel putative PPARgamma target genes in murine fibroblasts and to determine the role of the A/B-domain in PPARgamma-mediated transactivation of genomic target genes. Of the 257 genes found to be induced by PPARgamma2 expression, only 25 displayed A/B-domain dependency, i.e. significantly reduced induction in the cells expressing the truncated PPARgamma lacking the A/B-domain (PPARgammaCDE). Nine of the 25 A/B-domain-dependent genes were involved in lipid storage, and in line with this, triglyceride accumulation was considerably decreased in the cells expressing PPARgammaCDE compared with cells expressing full-length PPARgamma2. Using chromatin immunoprecipitation, we demonstrate that PPARgamma binding to genomic target sites and recruitment of the mediator component TRAP220/MED1/PBP/DRIP205 is not affected by the deletion of the A/B-domain. By contrast, the PPARgamma-mediated cAMP response element-binding protein (CREB)-binding protein (CBP) and p300 recruitment to A/B-domain-dependent target genes is compromised by deletion of the A/B-domain. These results indicate that the A/B-domain of PPARgamma2 is specifically involved in the recruitment or stabilization of CBP- and p300-containing cofactor complexes to a subset of target genes.
Bugge
Anne
A
Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense M, Denmark.
Grøntved
Lars
L
Aagaard
Mads M
MM
Borup
Rehannah
R
Mandrup
Susanne
S
D000256:Adenoviridae / Q000235:genetics; D000818:Animals; D002467:Cell Nucleus / Q000378:metabolism; D017362:Cyclic AMP Response Element-Binding Protein / Q000378:metabolism; D004247:DNA / Q000378:metabolism; D050881:E1A-Associated p300 Protein / Q000378:metabolism; D017353:Gene Deletion; D055785:Gene Knockdown Techniques; D005822:Genetic Vectors / Q000235:genetics; D016678:Genome / Q000235:genetics; D006801:Humans; D050356:Lipid Metabolism; D056913:Mediator Complex Subunit 1; D051379:Mice; D050505:Mutant Proteins / Q000378:metabolism; D047495:PPAR gamma / Q000737:chemistry* / Q000378:metabolism*; D011485:Protein Binding; D017434:Protein Structure, Tertiary; D021381:Protein Transport; D012319:RNA Polymerase II / Q000378:metabolism; D020218:Response Elements / Q000235:genetics; D014157:Transcription Factors / Q000378:metabolism*; D015533:Transcriptional Activation; D014161:Transduction, Genetic
D017362:Cyclic AMP Response Element-Binding Protein; C538855:MED1 protein, human; C538856:Med1 protein, mouse; D056913:Mediator Complex Subunit 1; D050505:Mutant Proteins; D047495:PPAR gamma; D014157:Transcription Factors; D004247:DNA; D050881:E1A-Associated p300 Protein; C494361:Ep300 protein, mouse; D012319:RNA Polymerase II