Fexaramine

Fexaramine is an investigational compound which acts as an agonist of the farnesoid X receptor (FXR), which is a bile acid-activated nuclear receptor that controls bile-acid synthesis, conjugation and transport, as well as lipid metabolism through actions in the liver and intestine.[1]

Fexaramine
Identifiers
CAS Number
PubChem CID
IUPHAR/BPS
DrugBank
ChemSpider
UNII
KEGG
ChEBI
ChEMBL
Chemical and physical data
FormulaC32H36N2O3
Molar mass496.651 g·mol−1
3D model (JSmol)

The first publication about fexaramine in 2003 showed it has 100-fold greater affinity for FXR than natural compounds and described the genomic targets and binding site on FXR.[2]

When administered orally to mice, fexaramine produced selective actions through FXR receptors in the intestines.[3] Consistent with the effects of other FXR agonist drugs,[4] in a study in mice, oral fexaramine stimulated intestinal fibroblast growth factor 15 (FGF15) production and resulted in metabolic improvements. Intestinal tissue-specific actions of fexaramine were suggested to be a possible new approach for the treatment of obesity and metabolic syndrome.[3] However it cannot be determined from these preliminary results in mice whether FXR agonism with fexaramine will produce weight loss in humans. There are no clinical trials of fexaramine planned in humans and therapy with such FXR agonists for obesity is only a theoretical approach.[4]

Crystallographic structure of the ligand binding domain of the farnesoid X receptor (rainbow colored cartoon, N-terminus = blue, C-terminus = red) complexed with fexaramine depicted as spheres (carbon = white, oxygen = red, nitrogen = blue).[2]

References
  1. Claudel T, Sturm E, Kuipers F, Staels B (September 2004). "The farnesoid X receptor: a novel drug target?". Expert Opin Investig Drugs. 13 (9): 1135–48. doi:10.1517/13543784.13.9.1135. PMID 15330745.
  2. PDB: 1OSH​; Downes M, Verdecia MA, Roecker AJ, Hughes R, Hogenesch JB, Kast-Woelbern HR, Bowman ME, Ferrer JL, Anisfeld AM, Edwards PA, Rosenfeld JM, Alvarez JG, Noel JP, Nicolaou KC, Evans RM (April 2003). "A chemical, genetic, and structural analysis of the nuclear bile acid receptor FXR". Mol. Cell. 11 (4): 1079–92. doi:10.1016/S1097-2765(03)00104-7. PMID 12718892.
  3. Fang S, Suh JM, Reilly SM, Yu E, Osborn O, Lackey D, Yoshihara E, Perino A, Jacinto S, Lukasheva Y, Atkins AR, Khvat A, Schnabl B, Yu RT, Brenner DA, Coulter S, Liddle C, Schoonjans K, Olefsky JM, Saltiel AR, Downes M, Evans RM (January 2015). "Intestinal FXR agonism promotes adipose tissue browning and reduces obesity and insulin resistance". Nat. Med. 21: 159–65. doi:10.1038/nm.3760. PMC 4320010. PMID 25559344.
  4. Ma H, Patti ME (August 2014). "Bile acids, obesity, and the metabolic syndrome". Best Pract Res Clin Gastroenterol. 28 (4): 573–83. doi:10.1016/j.bpg.2014.07.004. PMC 4159616. PMID 25194176.


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