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Related Experiment Videos

Ion channels as targets for insecticides

T Narahashi1, K S Ginsburg, K Nagata

  • 1Department of Molecular Pharmacology and Biological Chemistry, Northwestern University Medical School, Chicago, IL 60611-3008, USA.

Neurotoxicology
|September 24, 1998
PubMed
Summary
This summary is machine-generated.

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A small percentage of modified sodium channels can cause significant neurotoxicity, a finding applicable to various drugs. Pyrethroids

Area of Science:

  • Neuroscience
  • Toxicology
  • Molecular Biology

Background:

  • Insecticides target animal neuroreceptors and ion channels, causing neurotoxicity.
  • Pyrethroids prolong sodium channel opening, leading to hyperexcitation.
  • Dieldrin and hexachlorocyclohexane act on GABA(A) receptor chloride channels.

Purpose of the Study:

  • To quantify the sodium channel modification needed for hyperexcitation.
  • To elucidate the mechanisms of selective pyrethroid toxicity in mammals and insects.
  • To understand dieldrin's dual action on GABA(A) receptors.

Main Methods:

  • Developed a method to measure the percentage of modified sodium channels causing repetitive after-discharges.
  • Quantitatively determined pyrethroid toxicity mechanisms.

Related Experiment Videos

  • Investigated dieldrin's action in the presence and absence of the gamma2s subunit.

    • Main Results:

    • Only 0.6% of modified sodium channels in rat Purkinje neurons caused hyperexcitation and toxicity amplification.
    • Selective pyrethroid toxicity is mainly due to differential sodium channel sensitivity and negative temperature dependence.
    • Dieldrin exhibits dual action (stimulation/suppression) on GABA(A) receptors, with suppression causing hyperexcitation.

    Conclusions:

    • A threshold phenomenon exists for neuroactive drug action, with minor channel modification causing significant toxicity.
    • Negative temperature dependence of pyrethroids enhances sodium current, increasing toxicity at lower temperatures.
    • Dieldrin's effects on GABA(A) receptors are complex and subunit-dependent, contributing to its neurotoxic profile.