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Chemosensitization: do thiols matter?

L Roizin-Towle, E J Hall, T Costello

    International Journal of Radiation Oncology, Biology, Physics
    |September 1, 1984
    PubMed
    Summary
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    Endogenous thiols protect against chemotherapy toxicity. While thiol depletion enhances melphalan

    Area of Science:

    • Cellular Biology
    • Biochemistry
    • Pharmacology

    Background:

    • Endogenous sulfhydryls (thiols) are known radioprotectors in mammalian cells.
    • The role of thiols in chemotherapeutic drug toxicity is less defined but recognized.
    • Melphalan cytotoxicity can be influenced by cellular thiol levels.

    Purpose of the Study:

    • To investigate thiol depletion as a mechanism for enhanced melphalan cytotoxicity.
    • To compare the effects of misonidazole (MISO) and buthionine sulfoximine (BSO) on melphalan sensitivity.
    • To elucidate the role of thiols in drug-induced damage and repair.

    Main Methods:

    • Pretreatment of mammalian cells in vitro with misonidazole (MISO) and buthionine sulfoximine (BSO).
    • Assaying thiol depletion and subsequent melphalan cytotoxicity.

    Related Experiment Videos

  • Evaluating cellular vulnerability to oxidative stress and damage repair.

    • Main Results:

    • MISO-induced thiol depletion resulted in greater melphalan sensitization than BSO-induced depletion.
    • Cells pretreated with MISO showed increased vulnerability to oxidative stress compared to BSO-treated cells.
    • BSO inhibited the repair of MISO-induced damage, indicating thiol regeneration is crucial for recovery.

    Conclusions:

    • Thiol reduction alone does not fully explain MISO-mediated chemosensitization.
    • The method of thiol depletion influences subsequent drug interactions and biological damage.
    • Thiols appear more critical in repairing drug-induced damage than in initiating it.