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Related Experiment Videos

Fluorescent nitroheterocycles for identifying hypoxic cells.

P L Olive, R E Durand

    Cancer Research
    |July 1, 1983
    PubMed
    Summary
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    Fluorescent nitroheterocycles can identify hypoxic cells, which are more resistant to radiation. This study shows these probes are feasible for quantifying hypoxic cells in multicellular systems.

    Area of Science:

    • Biomedical research
    • Cell biology
    • Cancer research

    Background:

    • Mammalian cell binding of nitroheterocycles is oxygen-dependent.
    • Anoxic cells bind significantly more nitroheterocycles than aerobic cells.
    • Hypoxic cells are often radioresistant, posing a challenge in cancer therapy.

    Purpose of the Study:

    • To test the hypothesis that fluorescent nitroheterocycles can quantify hypoxic cells in multicellular systems.
    • To evaluate a specific nitrofuran, trans-5-amino-3-[(5-nitro-2-furyl)vinyl]-1,2,4-oxadiazole, as a hypoxic cell probe.
    • To correlate cellular fluorescence with radiosensitivity.

    Main Methods:

    • Utilized multicell spheroids to model multicellular systems.
    • Employed flow cytometry to quantify drug binding based on fluorescence.

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  • Used fluorescence-activated cell sorting to assess radiosensitivity in relation to fluorescence intensity.

    • Main Results:

    • Binding of the fluorescent nitrofuran was highly responsive to external oxygen concentration.
    • Highly fluorescent cells, indicating lower oxygen levels, were found to be more radioresistant.
    • Confirmed the general feasibility of fluorescent nitroheterocycles as hypoxic cell probes.

    Conclusions:

    • Fluorescent nitroheterocycles show promise for quantifying hypoxic cells in complex biological systems.
    • The observed fluorescence intensity correlates with cellular radiosensitivity.
    • Cellular binding of these agents is primarily, but not exclusively, dependent on oxygen content.