title: Thioredoxin reductase and cancer cell growth inhibition by organogold(III) compounds.
abstract: Thioredoxin (Trx) expression is increased in several human primary cancers associated with aggressive tumor growth and decreased patient survival, and the Trx/Trx reductase (TrxR) system therefore provides an attractive target for cancer drug development. Various gold(III) compounds with none, one, two or three carbon-gold bonds were evaluated for their capacity to inhibit TrxR and the growth of MCF-7 cancer cells in vitro. Compounds with up to two carbon-gold bonds were often potent inhibitors of TrxR with IC50 values as low as 2 nmol/l. In the presence of Trx and insulin the inhibiting capacity was much lower. However, the inhibitory concentrations of the compounds did not correlate with the ability to kill cells. Out of the organometallics tested, only compound 8 with two carbon-gold bonds was able to inhibit colony formation by MCF-7 breast cancer cells at low micromolar concentrations (IC50=1.6 micromol/l). Unfortunately, the compound did not show any anti-tumor activity against MCF-7 breast cancer and HT-29 colon cancer xenografts in scid mice.
authors.affiliation: Organic Chemistry, Department of Chemistry, Uppsala University, Uppsala, Sweden. Lars.Engman@kemi.uu.se
authors.forename: Lars
authors.initials: L
authors.lastname: Engman
authors.forename: Michael
authors.initials: M
authors.lastname: McNaughton
authors.forename: Malgorzata
authors.initials: M
authors.lastname: Gajewska
authors.forename: Sangit
authors.initials: S
authors.lastname: Kumar
authors.forename: Anne
authors.initials: A
authors.lastname: Birmingham
authors.forename: Garth
authors.initials: G
authors.lastname: Powis
mesh_terms: D000818:Animals; D001943:Breast Neoplasms / Q000188:drug therapy / Q000201:enzymology / Q000473:pathology; D016923:Cell Death / Q000187:drug effects; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D005260:Female; D006801:Humans; D051379:Mice; D016513:Mice, SCID; D009374:Neoplasms, Experimental / Q000188:drug therapy / Q000473:pathology; D050607:Organogold Compounds / Q000737:chemistry / Q000494:pharmacology*; D013880:Thioredoxin-Disulfide Reductase / Q000037:antagonists & inhibitors*
chemical_list: D050607:Organogold Compounds; D013880:Thioredoxin-Disulfide Reductase