Abstract
Expression of the LXRα nuclear receptor in liver is predicted to affect cholesterol and lipid metabolism. Here we show that a short fragment from the LXRα gene promoter spanning the region from −144 to +43 relative to the mRNA initiation site can drive transcription of a reporter gene. Under basal conditions, in vitro DNase I footprinting demonstrated interaction between nuclear proteins and an NF1 recognition site in close vicinity to the transcriptional initiation. Both supershift, mutational analyses in EMSA and transfections provided evidence that the NF1 (nuclear factor I) transcription factor interacts with the LXRα promoter. All four members of the NF1 family were found to suppress the transcriptional activity indicating a general inhibitory effect on LXRα expression. A similar regulation by NF1 was also observed when using a fragment from the LXRα promoter extending up to position −3033 therefore giving the inhibitory effect of NF1 a significant impact on LXRα gene expression.
Published Version
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