Title : Transcriptional activation of PPARalpha by phenobarbital in the absence of CAR and PXR.

Pub. Date : 2009 Sep-Oct

PMID : 19708687






5 Functional Relationships(s)
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1 The nuclear receptors CAR (constitutive androstane receptor) and PXR (pregnane X receptor) mediate the effects of phenobarbital on gene transcription. Phenobarbital nuclear receptor subfamily 1, group I, member 2 Mus musculus
2 The nuclear receptors CAR (constitutive androstane receptor) and PXR (pregnane X receptor) mediate the effects of phenobarbital on gene transcription. Phenobarbital nuclear receptor subfamily 1, group I, member 2 Mus musculus
3 Interestingly, in primary cultures of hepatocytes isolated from CAR/PXR(-/-) knockout mice, phenobarbital increased HNF-4alpha levels. Phenobarbital nuclear receptor subfamily 1, group I, member 2 Mus musculus
4 In further experiments in these hepatocyte cultures we provide evidence that phenobarbital directly induces transcription of the PPARalpha gene via its HNF-4alpha response element, and indirectly by lack of inhibitory crosstalk of AMPK, CAR and PXR with HNF-4alpha. Phenobarbital nuclear receptor subfamily 1, group I, member 2 Mus musculus
5 Our results provide further insight into CAR and PXR-independent effects of phenobarbital and the crosstalk between different nuclear receptor signaling pathways. Phenobarbital nuclear receptor subfamily 1, group I, member 2 Mus musculus