FXR (法尼酯X受体)

Farnesoid X receptor (FXR) is a ligand-activated transcription factor belonging to the nuclear receptor superfamily. FXR regulates the expression of various genes by binding to DNA either as a monomer or a heterodimer with the common partner for NRs, retinoid x receptor (RXR), to FXR response elements. Two known FXR genes exist, the FXRα and FXRβ.

FXR is mainly expressed in liver and small intestine, where it plays an important role in bile acid, lipid, and glucose metabolism. FXR affects several metabolic pathways through its specific target genes, regulating bile acid (BA) synthesis and homeostasis, glucose and lipid metabolism, also exhibiting a crucial role in intestinal bacterial growth and liver regeneration.