title: Screening and characterization of estrogenic activity from a hydroxystilbene library.
abstract: BACKGROUND
  Compounds that either inhibit or induce an estrogen response in vivo are important as potential drugs and biochemical tools. Non-steroidal stilbene analogs such as tamoxifen are known to function as both estrogen agonists and antagonists depending upon the analog structure. This family of compounds is amenable to parallel-manifold synthesis because stilbene analogs are easily synthesized using a single-step olefination reaction.
  
  
  RESULTS
  We have prepared a small 23-component hydroxystilbene library using a solid phase synthesis approach. The library was screened for estrogenic and antiestrogenic activity using a cell-based bioassay that measures estrogen receptor-mediated transcription of a reporter gene. Three of the analogs proved to have dose-dependent estrogenic activity with EC50 values between 5 microM and 15 microM. Further characterization of the hydroxystilbene-mediated estrogenic activity suggests that the agonist activity results from direct binding to the steroid site on the estrogen receptor with IC50 values of 1-10 microM.
  
  
  CONCLUSIONS
  The results of this study show that classic olefination chemistry can be adapted to a solid-phase format for parallel synthesis of analog libraries. Although yields varied for the individual analogs, sufficient quantity of pure material was obtained directly from the resin for structural characterization and biological evaluation. This study further validates solid-phase organic synthesis as a useful approach for rapid parallel-manifold library synthesis to augment both lead compound discovery and optimization.
authors.affiliation: Department of Pharmacy, University of California, San Francisco 94143, USA.
authors.forename: R
authors.initials: R
authors.lastname: Williard
authors.forename: V
authors.initials: V
authors.lastname: Jammalamadaka
authors.forename: D
authors.initials: D
authors.lastname: Zava
authors.forename: C C
authors.initials: CC
authors.lastname: Benz
authors.forename: C A
authors.initials: CA
authors.lastname: Hunt
authors.forename: P J
authors.initials: PJ
authors.lastname: Kushner
authors.forename: T S
authors.initials: TS
authors.lastname: Scanlan
mesh_terms: D001667:Binding, Competitive / Q000187:drug effects; D001681:Biological Assay; D002460:Cell Line; D004305:Dose-Response Relationship, Drug; D018274:Electroporation; D004958:Estradiol / Q000378:metabolism; D004965:Estrogen Antagonists / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D006801:Humans; D011960:Receptors, Estrogen / Q000037:antagonists & inhibitors; D013267:Stilbenes / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*
chemical_list: D004965:Estrogen Antagonists; D011960:Receptors, Estrogen; D013267:Stilbenes; D004958:Estradiol