title: Stilbene analogues affect cell cycle progression and apoptosis independently of each other in an MCF-7 array of clones with distinct genetic and chemoresistant backgrounds.
abstract: The development of chemoresistant breast cancer is poorly understood and second treatment options are barely investigated. The term 'chemoresistance' is ill-defined and thus, our experimental analyses aimed to disentangle the resistance to cell cycle arrest from the resistance to trigger apoptosis, both of which are important mechanisms to be targeted by anticancer therapy. Therefore, an MCF-7 array, which encompassed clones harboring distinct genetically- and pharmacologically-induced stages of resistance, was established. For this, MCF-7 cells were stably transfected with erbB2 cDNA and a dominant negative p53 mutation and the two clones were subjected to long-term treatment with the clinical agents 2'-deoxy-5-fluorouridine (5-FdUrd) or arabinosylcytosine (AraC) to develop specific chemoresistance. This array was tested with 3,4',5-trihydroxy-trans-stilbene (resveratrol) and the methoxylated paired stilbene analogue 3,4',5-trimethoxy-trans-stilbene (M5) to investigate whether these agents can overcome genetically- and pharmacologically-induced chemoresistance and to correlate the structure-activity relationship of resveratrol and M5. In all conditions tested, M5 exhibited stronger anticancer activity than resveratrol, but the cell cycle inhibitory properties of the tested drugs were dependent on the genetic background and the chemoresistant phenotype. In contrast, the proapoptotic properties were rather similar in the distinct genetic backgrounds of the clone array and therefore, apoptotic triggers and cell cycle checkpoints were distinctly affected and are thus independent of each other. The study demonstrates the merits or virtues of the genotypically- and phenotypically-defined clones of the MCF-7 array as a testing tool for novel drugs, which discriminates the two types of chemoresistance mechanisms.
authors.affiliation: Institute of Clinical Pathology, General Hospital of Vienna, Medical University of Vienna, A-1090 Vienna, Austria.
authors.forename: Yvonne
authors.initials: Y
authors.lastname: Bader
authors.forename: Sibylle
authors.initials: S
authors.lastname: Madlener
authors.forename: Stephan
authors.initials: S
authors.lastname: Strasser
authors.forename: Susanne
authors.initials: S
authors.lastname: Maier
authors.forename: Philipp
authors.initials: P
authors.lastname: Saiko
authors.forename: Nicole
authors.initials: N
authors.lastname: Stark
authors.forename: Ruxandra
authors.initials: R
authors.lastname: Popescu
authors.forename: Daniela
authors.initials: D
authors.lastname: Huber
authors.forename: Michaela
authors.initials: M
authors.lastname: Gollinger
authors.forename: Thomas
authors.initials: T
authors.lastname: Erker
authors.forename: Norbert
authors.initials: N
authors.lastname: Handler
authors.forename: Akos
authors.initials: A
authors.lastname: Szakmary
authors.forename: Walter
authors.initials: W
authors.lastname: Jäger
authors.forename: Brigitte
authors.initials: B
authors.lastname: Kopp
authors.forename: Ioannis
authors.initials: I
authors.lastname: Tentes
authors.forename: Monika
authors.initials: M
authors.lastname: Fritzer-Szekeres
authors.forename: Georg
authors.initials: G
authors.lastname: Krupitza
authors.forename: Thomas
authors.initials: T
authors.lastname: Szekeres
mesh_terms: D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use; D017209:Apoptosis; D001943:Breast Neoplasms / Q000188:drug therapy* / Q000235:genetics / Q000473:pathology; D002453:Cell Cycle / Q000187:drug effects*; D049109:Cell Proliferation / Q000187:drug effects; D002999:Clone Cells; D019008:Drug Resistance, Neoplasm; D005260:Female; D018734:Genes, erbB-2; D016158:Genes, p53; D006801:Humans; D000077185:Resveratrol; D013267:Stilbenes / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use
chemical_list: C497286:3,4',5-trimethoxystilbene; D000972:Antineoplastic Agents, Phytogenic; D013267:Stilbenes; D000077185:Resveratrol