title: erbB-2 oncogene inhibition by geldanamycin derivatives: synthesis, mechanism of action, and structure-activity relationships.
abstract: Overexpression of the erbB-2 oncogene has been linked to poor prognosis in breast, ovarian, and gastric cancers. Naturally occurring benzoquinoid ansamycin antibiotics herbimycin A, geldanamycin (GDM), and dihydrogeldanamycin were found to potently deplete p185, the erbB-2 oncoprotein, in human breast cancer SKBR-3 cells in culture. Chemistry efforts to modify selectively the ansa ring of GDM afforded derivatives with greater potency in vitro and in vivo. Analogs demonstrated inhibition of p185 phosphotyrosine in cell culture and in vivo after systemic drug administration to nu/nu nude mice bearing Fisher rat embryo cells transfected with human erbB-2. Functional group modification in the ansa ring was performed stereoselectively and regiospecifically without the need for protection strategies. Essential functional groups that were required for anti-erbB-2 activity were the 7-carbamate and the 2,3-double bond. Modification of the functional groups at the other positions was permitted. Structure-activity relationships are described for 1-5-, 7-9-, 11-, 15-, and 22-substituted geldanamycins.
authors.affiliation: Pfizer Central Research, Groton, Connecticut 06340, USA.
authors.forename: R C
authors.initials: RC
authors.lastname: Schnur
authors.forename: M L
authors.initials: ML
authors.lastname: Corman
authors.forename: R J
authors.initials: RJ
authors.lastname: Gallaschun
authors.forename: B A
authors.initials: BA
authors.lastname: Cooper
authors.forename: M F
authors.initials: MF
authors.lastname: Dee
authors.forename: J L
authors.initials: JL
authors.lastname: Doty
authors.forename: M L
authors.initials: ML
authors.lastname: Muzzi
authors.forename: C I
authors.initials: CI
authors.lastname: DiOrio
authors.forename: E G
authors.initials: EG
authors.lastname: Barbacci
authors.forename: P E
authors.initials: PE
authors.lastname: Miller
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000737:chemistry / Q000494:pharmacology; D000903:Antibiotics, Antineoplastic / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D016227:Benzoquinones; D001943:Breast Neoplasms / Q000188:drug therapy; D005260:Female; D018734:Genes, erbB-2; D006801:Humans; D047029:Lactams, Macrocyclic; D051379:Mice; D008819:Mice, Nude; D008968:Molecular Conformation; D015394:Molecular Structure; D011505:Protein-Tyrosine Kinases / Q000037:antagonists & inhibitors; D011809:Quinones / Q000138:chemical synthesis* / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology*; D051381:Rats; D018719:Erb-b2 Receptor Tyrosine Kinases / Q000037:antagonists & inhibitors* / Q000235:genetics; D013329:Structure-Activity Relationship; D014162:Transfection
chemical_list: D000900:Anti-Bacterial Agents; D000903:Antibiotics, Antineoplastic; D016227:Benzoquinones; D047029:Lactams, Macrocyclic; D011505:Protein-Tyrosine Kinases; D011809:Quinones; D018719:Erb-b2 Receptor Tyrosine Kinases; C001277:geldanamycin