RXRα

RXRα is a nuclear receptor that regulates transcription through heterodimerization with diverse nuclear receptors, linking retinoid signaling to cell proliferation, differentiation, lipid metabolism, and pharmacology^[1]. Mechanistically, RXR-containing heterodimers control liver physiology by modulating lipid and bile acid metabolism in hepatocytes, cholesterol transport in macrophages, and fibrogenesis in hepatic stellate cells^[2]. In mouse liver, RXRα binds widely across the genome and supports sex-dimorphic expression of lipid-processing genes, including Scd1, Fasn, Elovl6, and Pnpla3^[3]. In disease models, altered RXRα expression or truncated RXRα connects RXRα biology to prostate cancer, chronic myeloid leukemia, and tumor-growth pathways involving PI3K/AKT and NF-κB signaling^[4][5][6]. Compared with RXRβ and RXRγ, RXRα belongs to RXR isotypes with distinct properties that modulate RXR-containing heterodimer activity, making isoform selection important in experimental design^[1]. For research applications, RXR ligands such as LG268, clinically relevant RXRA ligands, and sulindac analogs provide tools to test RXRα-dependent transcriptional regulation, leukemia drug sensitivity, and truncated RXRα signaling^[3][5][6].