title: The hypolipidemic natural product guggulsterone is a promiscuous steroid receptor ligand.
abstract: Guggulsterone (GS) is the active substance in guggulipid, an extract of the guggul tree, Commiphora mukul, used to treat a variety of disorders in humans, including dyslipidemia, obesity, and inflammation. The activity of GS has been suggested to be mediated by antagonism of the receptor for bile acids, the farnesoid X receptor (FXR). Here, we demonstrate that both stereoisomers of the plant sterol, (E)- and (Z)-GS, bind to the steroid receptors at a much higher affinity than to FXR. Both stereoisomers bind to the mineralocorticoid receptor (MR) with a Ki value of approximately 35 nM, which is greater than 100 times more potent than their affinity for FXR. Both (E)- and (Z)-GS also displayed high affinity for other steroid receptors, including the androgen (AR), glucocorticoid (GR), and progesterone receptors (PR) with Ki values ranging from 224 to 315 nM. In cell-based functional cotransfection assays, GSs behaved as antagonists of AR, GR, and MR, but as agonists of PR. Agonist activity was also demonstrated with estrogen receptor (ER) alpha; however, the potency was very low (EC50 > 5000 nM). In addition, GS displayed activity in functional assays in cell lines expressing endogenous AR, GR, ER, and PR. These data suggest that the variety of pharmacological effects exhibited by GS may be mediated by targeting several steroid receptors.
authors.affiliation: Lilly Research Laboratories, Lilly Corporate Center, Indianapolis, IN 46285, USA. burris@lilly.com
authors.forename: Thomas P
authors.initials: TP
authors.lastname: Burris
authors.forename: Chahrzad
authors.initials: C
authors.lastname: Montrose
authors.forename: Keith A
authors.initials: KA
authors.lastname: Houck
authors.forename: Harold E
authors.initials: HE
authors.lastname: Osborne
authors.forename: Wayne P
authors.initials: WP
authors.lastname: Bocchinfuso
authors.forename: Benjamin C
authors.initials: BC
authors.lastname: Yaden
authors.forename: Christine C
authors.initials: CC
authors.lastname: Cheng
authors.forename: Richard W
authors.initials: RW
authors.lastname: Zink
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Barr
authors.forename: Christoper D
authors.initials: CD
authors.lastname: Hepler
authors.forename: Venkatesh
authors.initials: V
authors.lastname: Krishnan
authors.forename: Heather A
authors.initials: HA
authors.lastname: Bullock
authors.forename: Lorri L
authors.initials: LL
authors.lastname: Burris
authors.forename: Rachelle J
authors.initials: RJ
authors.lastname: Galvin
authors.forename: Kelli
authors.initials: K
authors.lastname: Bramlett
authors.forename: Keith R
authors.initials: KR
authors.lastname: Stayrook
mesh_terms: D002460:Cell Line; D006801:Humans; D000960:Hypolipidemic Agents / Q000494:pharmacology*; D007700:Kinetics; D008024:Ligands; D008517:Phytotherapy; D010936:Plant Extracts / Q000494:pharmacology; D011282:Pregnenediones / Q000493:pharmacokinetics* / Q000494:pharmacology*; D011869:Radioligand Assay; D011987:Receptors, Steroid / Q000378:metabolism*; D014162:Transfection
chemical_list: D000960:Hypolipidemic Agents; D008024:Ligands; D010936:Plant Extracts; D011282:Pregnenediones; D011987:Receptors, Steroid; C023617:pregna-4,17-diene-3,16-dione