Peroxisome proliferator-activated receptor family (PPAR)

The Peroxisome Proliferator-Activated Receptors (PPARs) are a group of three nuclear receptor isoforms—alpha (NR1C1), delta/beta (NR1C2), and gamma (NR1C3)—that function as ligand-activated transcription factors (StatPearls, 2023). They play a central role in the regulation of metabolic homeostasis, including lipid and glucose metabolism, as well as inflammatory responses (UniProt). Upon activation by fatty acids or synthetic ligands, PPARs form heterodimers with the Retinoid X Receptor (RXR) and bind to specific DNA sequences known as Peroxisome Proliferator Response Elements (PPREs) to modulate gene expression (PubMed). PPAR alpha is primarily involved in fatty acid oxidation and is the target of fibrate drugs used for dyslipidemia, while PPAR gamma is a master regulator of adipogenesis and insulin sensitivity, serving as the target for thiazolidinediones in type 2 diabetes treatment (Nature Reviews Drug Discovery). PPAR delta is involved in energy expenditure and fatty acid metabolism in various tissues like muscle and skin. Due to their diverse roles, the PPAR family is a major focus for treating metabolic syndrome, non-alcoholic steatohepatitis (NASH), and cardiovascular diseases (NIH).

Other names

NR1C familyPeroxisome proliferator-activated receptorsPPARs

Agonism of PPAR isoforms leads to heterodimerization with the Retinoid X Receptor (RXR), binding to Peroxisome Proliferator Response Elements (PPREs) in target gene promoters, and subsequent recruitment of coactivators to modulate the transcription of genes involved in metabolism and inflammation.