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    Cytotoxicity of the bioreductive agent RH1 and its lack of interaction with radiation.

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    Authors
    Kim, Joo-Young
    West, Catharine M L
    Valentine, Helen R
    Ward, Timothy H
    Patterson, Adam V
    Stratford, Ian J
    Roberts, Stephen A
    Hendry, Jolyon H
    Affiliation
    Cancer Research UK Groups of Experimental Radiation Oncology, Paterson Institute for Cancer Research, Christie Hospital NHS Trust, Manchester, UK.
    Issue Date
    2004-03
    
    Metadata
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    Abstract
    BACKGROUND AND PURPOSE: RH1 is a new bioreductive agent that was developed as a cytotoxic agent with selectivity for tumour cells expressing high levels of the enzyme DT-diaphorase (DTD). The aim of the present study was to investigate the cytotoxicity of RH1 in relation to cellular levels of reducing enzymes and any interaction of RH1 with ionizing radiation under oxic and hypoxic conditions. PATIENTS AND METHODS: The MB-MDA231 human breast cancer cell line (WT) and WT cells transfected with the NQO1 gene encoding DTD (the D7 cell line) were used to examine the dependency of RH1's cytotoxicity on cellular DTD activity. The role of the 1-electron reducing enzyme P450 reductase was also studied using a P450 reductase-transfected isogenic cell line (R4). A clonogenic assay was used to investigate the cytotoxicity of RH1 with and without irradiation in air and in nitrogen. In all cases drug exposure was for 3 h. RESULTS: DTD levels were around 300-fold higher in D7 compared to WT and R4 cells. RH1 was cytotoxic at nanomolar concentrations to all the cell lines, and was 2-3 times more toxic in the D7 cells with high DTD than in the other two cell lines. Doses of RH1 was around 2-fold more effective in hypoxic than in oxic WT cells, but not by as much in D7 cells. RH1 did not radiosensitise the cells but showed an additive effect when combined with irradiation under oxic and hypoxic conditions. CONCLUSIONS: RH1 shows high clonogenic cytotoxicity to MDA231 cells with high DTD activity but its selectivity based on the presence of DTD is much less than as shown in previous reports. RH1 showed an additive cell killing effect when combined with irradiation under both oxic and hypoxic conditions.
    Citation
    Cytotoxicity of the bioreductive agent RH1 and its lack of interaction with radiation. 2004, 70 (3):311-7 Radiother Oncol
    Journal
    Radiotherapy and Oncology
    URI
    http://hdl.handle.net/10541/78111
    DOI
    10.1016/j.radonc.2003.12.008
    PubMed ID
    15064018
    Type
    Article
    Language
    en
    ISSN
    0167-8140
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.radonc.2003.12.008
    Scopus Count
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    All Christie Publications
    All Paterson Institute for Cancer Research

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