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Sterol-dependent nuclear import of ORP1S promotes LXR regulated trans-activation of apoE

Sungsoo Lee; Ping-Yuan Wang; Yangsik Jeong; David J. Mangelsdorf; Richard G.W. Anderson; Peter Michaely

(Profiled Authors: David J Mangelsdorf; Peter A Michaely)

Experimental Cell Research. 2012;318(16):2128-2142.

Abstract

Oxysterol binding protein related protein 1S (ORP1S) is a member of a family of sterol transport proteins. Here we present evidence that ORP1S translocates from the cytoplasm to the nucleus in response to sterol binding. The sterols that best promote nuclear import of ORP1S also activate the liver X receptor (LXR) transcription factors and we show that ORP1S binds to LXRs, promotes binding of LXRs to LXR response elements (LXREs) and specifically enhances LXR-dependent transcription via the ME.1 and ME.2 enhancer elements of the apoE gene. We propose that ORP1S is a cytoplasmic sterol sensor, which transports sterols to the nucleus and promotes LXR-dependent gene transcription through select enhancer elements. © 2012 Elsevier Inc.


PMID: 22728266     PMCID: PMC3867128    

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