Insights on pregnane-X-receptor modulation. Natural and semisynthetic steroids from Theonella marine sponges

Eur J Med Chem. 2014 Feb 12;73:126-34. doi: 10.1016/j.ejmech.2013.12.005. Epub 2013 Dec 15.


Pregnane-X-receptor (PXR) is a member of nuclear receptors superfamily that activates gene transcription by binding to responsive elements in the promoter of target genes. PXR is a master gene orchestrating the expression/activity of genes involved in the metabolism of endobiotics including bilirubin, bile acids, glucose and lipid. In addition PXR oversights the metabolism of the large majority of xenobiotics including a large amount of prescribing drugs. Thus, developing PXR ligands represents a great opportunity for a therapeutic intervention on human diseases including diabetes, obesity, dyslipidemias and liver disorders. To this end, natural compounds represent an arsenal of new chemical scaffolds useful for the identification of novel PXR ligands. Here, we report a series of 4-methylenesteroid derivatives isolated from Theonella marine sponges as novel PXR modulators. In addition, combining medicinal chemistry, pharmacological experiments and computational studies, we have investigated the effects of different modifications on ring A and on the side chain of 4-methylenesteroid derivatives toward PXR modulation. This study provides the molecular bases of ligand/PXR interaction useful for designing novel PXR modulators.

Keywords: 4-Methylenesteroids; Conicasterol; Molecular docking; Pregnane-X-receptor; Structure–activity relationship; Theonella marine sponges.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Binding Sites
  • Biological Products / chemical synthesis*
  • Biological Products / isolation & purification
  • Biological Products / pharmacology
  • Hep G2 Cells
  • Humans
  • Molecular Docking Simulation
  • Molecular Structure
  • Pregnane X Receptor
  • Real-Time Polymerase Chain Reaction
  • Receptors, Steroid / genetics
  • Receptors, Steroid / metabolism*
  • Steroids / chemical synthesis*
  • Steroids / isolation & purification
  • Steroids / pharmacology
  • Structure-Activity Relationship
  • Theonella / chemistry*
  • Transferases


  • Biological Products
  • Pregnane X Receptor
  • Receptors, Steroid
  • Steroids
  • Transferases