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    In vitro, in vivo, and in silico analyses of the antitumor activity of 2-(4-amino-3-methylphenyl)-5-fluorobenzothiazoles

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    Publication date
    2004
    Author
    Bibby, Michael C.
    Leong, C.O.
    Suggitt, Marie
    Swaine, David J.
    Bradshaw, T.C.
    Keyword
    Comet assay
    Benzothiazole
    Self organised map
    Peer-Reviewed
    Yes
    
    Metadata
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    Abstract
    Phortress is a novel, potent, and selective experimental antitumor agent. Its mechanism of action involves induction of CYP1A1-catalyzed biotransformation of 2-(4-amino-3-methylphenyl)-5-fluorobenzothiazole (5F 203) to generate electrophilic species, which covalently bind to DNA, exacting lethal damage to sensitive tumor cells, in vitro and in vivo. Herein, we investigate the effects of DNA adduct formation on cellular DNA integrity and progression through cell cycle and examine whether a relevant pharmacodynamic end point may be exploited to probe the clinical mechanism of action of Phortress and predict tumor response. Single cell gel electrophoresis (SCGE) was applied to quantify DNA damage and cell cycle analyses conducted upon 5F 203 treatment of benzothiazole-sensitive MCF-7 and inherently resistant MDA-MB-435 breast carcinoma cells. Following treatment of xenograft-bearing mice and mice possessing hollow fiber implants containing MCF-7 or MDA-MB-435 cells with Phortress (20 mg/kg, i.p., 24 hours), tumor cells and xenografts were recovered for analyses by SCGE. Dose- and time-dependent DNA single and double strand breaks occurred exclusively in sensitive cells following treatment with 5F 203 in vitro (10 nmol/L¿10 ¿mol/L; 24¿72 hours). In vivo, Phortress-sensitive and Phortress-resistant tumor cells were distinct; moreover, DNA damage in xenografts, following treatment of mice with Phortress, could be determined. Interrogation of the mechanism of action of 5F 203 in silico by self-organizing map-based cluster analyses revealed modulation of phosphatases and kinases associated with cell cycle regulation, corroborating observations of selective cell cycle perturbation by 5F 203 in sensitive cells. By conducting SCGE, tumor sensitivity to Phortress, an agent currently undergoing clinical evaluation, may be determined.
    URI
    http://hdl.handle.net/10454/3159
    Version
    No full-text available in the repository
    Citation
    Leong, C.O., Suggitt, M., Swaine, D.J., Bibby, M. C., Stevens, M.F.G. and Bradshaw, T.C. (2004). In vitro, in vivo, and in silico analyses of the antitumor activity of 2-(4-amino-3-methylphenyl)-5-fluorobenzothiazoles. Molecular Cancer Therapeutics. Vol. 3, No. 12, pp. 1565-1575.
    Type
    Article
    Collections
    Life Sciences Publications

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