LXR, a nuclear receptor that defines a distinct retinoid response pathway.
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Willy PJ, Umesono K, Ong ES, Evans RM, Heyman RA, Mangelsdorf DJ
LXR, a nuclear receptor that defines a distinct retinoid response pathway.
Genes Dev. 1995 May 1;9(9):1033-45.
- PubMed ID
- 7744246 [ View in PubMed]
- Abstract
We have identified a new retinoid response pathway through which 9-cis retinoic acid (9cRA) activates transcription in the presence of LXR alpha, a member of the nuclear receptor superfamily. LXR alpha shows a specific pattern of expression in visceral organs, thereby restricting the response to certain tissues. Retinoid trans-activation occurs selectively on a distinct response element termed an LXRE. Significantly, neither RXR homodimers nor RXR/RAR heterodimers are able to substitute for LXR alpha in mediating this retinoid response. We provide evidence that the retinoid response on the LXRE is the result of a unique interaction between LXR alpha and endogenous RXR, which, unlike in the RXR/RAR heterodimer, makes RXR competent to respond to retinoids. Thus, the interaction with LXR alpha shifts RXR from its role described previously as a silent, DNA-binding partner to an active ligand-binding subunit in mediating retinoid responses through target genes defined by LXREs.