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Palytoxin-induced permeability changes in excitable membranes.

L Lauffer, S Stengelin, L Béress

    Biochimica Et Biophysica Acta
    |August 8, 1985
    PubMed
    Summary
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    Palytoxin increases cation permeability in biological membranes like nerves, but not artificial ones. Ouabain inhibits this effect, suggesting it doesn't involve the (Na+ + K+)-ATPase.

    Area of Science:

    • Marine Biology
    • Neuroscience
    • Toxicology

    Background:

    • Palytoxin is a potent marine toxin known to affect ion transport.
    • Previous studies suggested palytoxin might target the (Na+ + K+)-ATPase in non-neuronal cells.

    Purpose of the Study:

    • To investigate the effects of palytoxin on cation permeability in excitable biological membranes.
    • To determine the specific ion channels or mechanisms involved in palytoxin-induced ion flow.

    Main Methods:

    • Investigated palytoxin's effect on crayfish axonal membranes and Torpedo electric tissue membranes.
    • Utilized artificial liposomes as a control system.
    • Tested the influence of tetrodotoxin, alpha-bungarotoxin, triphenylmethylphosphonium, and ouabain on palytoxin-induced ion flow.

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    Main Results:

    • Palytoxin (0.14 microM) increased cation permeability in both axonal and receptor-rich membranes, but not artificial liposomes.
    • Palytoxin's effect on axonal membranes was independent of voltage-dependent sodium channels (not blocked by tetrodotoxin).
    • Palytoxin's effect on receptor-rich membranes was not mediated by nicotinic acetylcholine receptors (not blocked by alpha-bungarotoxin or triphenylmethylphosphonium).
    • Ouabain inhibited palytoxin-induced cation flow in both biological membrane systems.

    Conclusions:

    • Palytoxin enhances cation permeability in excitable biological membranes.
    • The mechanism of palytoxin action differs from voltage-dependent sodium channels and nicotinic acetylcholine receptors.
    • Palytoxin's interaction with biological membranes does not appear to directly involve the (Na+ + K+)-ATPase, contrary to some previous hypotheses.