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Thallium antagonism toward potassium dependent systems

B Z Siegel, S M Siegel

    Bioinorganic Chemistry
    |January 1, 1976
    PubMed
    Summary
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    Potassium chloride (KCl) and ammonium chloride (NH4Cl) partially restored yeast carbon dioxide (CO2) production inhibited by thallium (Tl+). Other Group 1A chlorides showed no effect or further inhibition.

    Area of Science:

    • Biochemistry
    • Cellular Physiology
    • Enzyme Kinetics

    Background:

    • Thallium (Tl+) is a known inhibitor of cellular processes.
    • Yeast (Saccharomyces cerevisiae) is a model organism for studying cellular metabolism.
    • Carbon dioxide (CO2) production is a key indicator of metabolic activity in yeast.

    Purpose of the Study:

    • To investigate the effect of Group 1A chlorides on thallium-inhibited yeast CO2 production.
    • To determine the potential restorative effects of alkali metal ions and ammonium on thallium toxicity in yeast.

    Main Methods:

    • Yeast solutions were treated with 20 mM thallium (Tl+).
    • Various Group 1A chlorides (KCl, NH4Cl, NaCl, RbCl, CsCl, LiCl) were added to assess their impact.
    • Carbon dioxide (CO2) production was measured as an indicator of metabolic activity.

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  • Potassium ion (K+) depletion was achieved through dialysis.

    • Main Results:

    • Potassium chloride (KCl) demonstrated the most significant restorative effect on Tl+-inhibited CO2 production.
    • Ammonium chloride (NH4Cl) showed a lesser restorative effect compared to KCl.
    • Sodium chloride (NaCl), rubidium chloride (RbCl), and cesium chloride (CsCl) had no significant impact.
    • Lithium chloride (LiCl) exacerbated the inhibition of CO2 production.
    • Dialysis to remove potassium ions reduced CO2 production by approximately 70%.
    • The restorative effect of potassium was diminished when administered concurrently with thallium.

    Conclusions:

    • Potassium ions play a crucial role in mitigating thallium toxicity in yeast.
    • Specific alkali metal ions, particularly potassium, can counteract thallium-induced metabolic inhibition.
    • The findings highlight the importance of ion balance in cellular response to heavy metal stress.