Aldose Reductase Acts as a Selective Derepressor of PPARγ and the Retinoic Acid Receptor

• Main Authors: Devi Thiagarajan, Radha Ananthakrishnan, Jinghua Zhang, Karen M. O’Shea, Nosirudeen Quadri, Qing Li, Kelli Sas, Xiao Jing, Rosa Rosario, Subramaniam Pennathur, Ann Marie Schmidt, Ravichandran Ramasamy
• Format: Article
• Language: English
• Published: Elsevier 2016-04-01
• Series: Cell Reports
• Online Access: http://www.sciencedirect.com/science/article/pii/S2211124716302212

Histone deacetylase 3 (HDAC3), a chromatin-modifying enzyme, requires association with the deacetylase-containing domain (DAD) of the nuclear receptor corepressors NCOR1 and SMRT for its stability and activity. Here, we show that aldose reductase (AR), the rate-limiting enzyme of the polyol pathway, competes with HDAC3 to bind the NCOR1/SMRT DAD. Increased AR expression leads to HDAC3 degradation followed by increased PPARγ signaling, resulting in lipid accumulation in the heart. AR also downregulates expression of nuclear corepressor complex cofactors including Gps2 and Tblr1, thus affecting activity of the nuclear corepressor complex itself. Though AR reduces HDAC3-corepressor complex formation, it specifically derepresses the retinoic acid receptor (RAR), but not other nuclear receptors such as the thyroid receptor (TR) and liver X receptor (LXR). In summary, this work defines a distinct role for AR in lipid and retinoid metabolism through HDAC3 regulation and consequent derepression of PPARγ and RAR.