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Abstract
The transcription factor NR4A1 belongs to the class of orphan nuclear receptors without known ligand which might control its activity. Here we examined its transcriptional regulation in response to elevated cAMP levels in HL-1 cardiac myocytes and in the heart in vivo. We report, that murine Nr4a1 is expressed from distinct promoters located upto −11.5kb from the first coding exon. Whereas in HL-1 cells only two of the three distinct transcripts were induced by cAMP, in the heart all transcripts were regulated in response to β-adrenergic stimulation.
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