title: Latrunculin A and its C-17-O-carbamates inhibit prostate tumor cell invasion and HIF-1 activation in breast tumor cells.
abstract: The marine-derived macrolides latrunculins A ( 1) and B, from the Red Sea sponge Negombata magnifica, have been found to reversibly bind actin monomers, forming a 1:1 complex with G-actin and disrupting its polymerization. The microfilament protein actin is responsible for several essential functions within the cell such as cytokinesis and cell migration. One of the main binding pharmacophores of 1 to G-actin was identified as the C-17 lactol hydroxyl moiety that binds arginine 210 NH. Latrunculin A-17- O-carbamates 2- 6 were prepared by reaction with the corresponding isocyanates. Latrunculin A ( 1) and carbamates 4- 6 displayed potent anti-invasive activity against the human highly metastatic human prostate cancer PC-3M cells in a Matrigel assay at a concentration range of 50 nM to 1 microM. Latrunculin A ( 1, 500 nM) decreased the disaggregation and cell migration of PC-3M-CT+ spheroids by 3-fold. Carbamates 4 and 5 were 2.5- and 5-fold more active than 1, respectively, in this assay with less actin binding affinity. Latrunculin A ( 1, IC 50 6.7 microM) and its 17- O-[ N-(benzyl)carbamate ( 6, IC 50 29 microM) suppress hypoxia-induced HIF-1 activation in T47D breast tumor cells.
authors.affiliation: Department of Basic Pharmaceutical Sciences, University of Louisana, Monroe, Louisana 71209, USA. elsayed@ulm.edu
authors.forename: Khalid A El
authors.initials: KA
authors.lastname: Sayed
authors.forename: Mohammad A
authors.initials: MA
authors.lastname: Khanfar
authors.forename: Hassan M
authors.initials: HM
authors.lastname: Shallal
authors.forename: A
authors.initials: A
authors.lastname: Muralidharan
authors.forename: Bhushan
authors.initials: B
authors.lastname: Awate
authors.forename: Diaa T A
authors.initials: DT
authors.lastname: Youssef
authors.forename: Yang
authors.initials: Y
authors.lastname: Liu
authors.forename: Yu-Dong
authors.initials: YD
authors.lastname: Zhou
authors.forename: Dale G
authors.initials: DG
authors.lastname: Nagle
authors.forename: Girish
authors.initials: G
authors.lastname: Shah
mesh_terms: D000818:Animals; D001943:Breast Neoplasms / Q000188:drug therapy; D019086:Bridged Bicyclo Compounds, Heterocyclic / Q000737:chemistry / Q000494:pharmacology*; D002219:Carbamates / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D004354:Drug Screening Assays, Antitumor; D006801:Humans; D051793:Hypoxia-Inducible Factor 1 / Q000037:antagonists & inhibitors*; D008297:Male; D015394:Molecular Structure; D011161:Porifera / Q000737:chemistry; D011471:Prostatic Neoplasms / Q000188:drug therapy; D053778:Thiazolidines / Q000737:chemistry / Q000494:pharmacology*
chemical_list: D019086:Bridged Bicyclo Compounds, Heterocyclic; D002219:Carbamates; D051793:Hypoxia-Inducible Factor 1; D053778:Thiazolidines; C037068:latrunculin B; C037067:latrunculin A