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Related Experiment Videos

Small-conductance calcium-activated potassium channels.

C T Bond1, J Maylie, J P Adelman

  • 1Vollum Institute, Oregon Health Sciences University, Portland 97201, USA.

Annals of the New York Academy of Sciences
|July 22, 1999
PubMed
Summary

Small conductance (SK) channels regulate neuronal firing by responding to calcium. This study compares apamin-sensitive and insensitive SK channels, crucial for normal neurotransmission and protecting cells from overactivity.

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Increasing small conductance Ca2+-activated potassium channel activity reverses ischemia-induced impairment of long-term potentiation.

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SK2 and SK3 expression differentially affect firing frequency and precision in dopamine neurons.

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Selective cognitive deficits and reduced hippocampal brain-derived neurotrophic factor mRNA expression in small-conductance calcium-activated K+ channel deficient mice.

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SK3 K+ channel-deficient mice have enhanced dopamine and serotonin release and altered emotional behaviors.

Genes, brain, and behavior·2008
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Small-conductance, Ca(2+) -activated K+ channel 2 is the key functional component of SK channels in mouse urinary bladder.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Pharmacology

Background:

  • Small conductance (SK) channels are vital potassium channels in excitable cells.
  • They activate with intracellular calcium increases during action potentials, causing hyperpolarization.
  • This process, known as slow afterhyperpolarization (sAHP), limits firing frequency and protects cells.

Purpose of the Study:

  • To compare different classes of slow afterhyperpolarizations (sAHPs).
  • To discuss cloned SK channels, their calcium gating, and differing pharmacologies.
  • To review the role of SK channels in pathological conditions.

Main Methods:

  • Classification of sAHPs based on sensitivity to apamin, a bee venom toxin.
  • Discussion of recently cloned apamin-sensitive and apamin-insensitive SK channels.

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  • Analysis of the kinetic differences and molecular basis for pharmacology.

    • Main Results:

    • Two main classes of sAHPs exist: apamin-sensitive (rapid activation, ~150 ms decay) and apamin-insensitive (slow activation, ~1.5 s decay).
    • SK channels responsible for these sAHPs have been cloned.
    • The molecular basis for the distinct kinetic and pharmacological properties is being investigated.

    Conclusions:

    • SK channels are critical for regulating neuronal excitability and preventing cellular damage.
    • Understanding the differences between apamin-sensitive and insensitive SK channels is key to their physiological and pathological roles.
    • Further research into cloned SK channels will elucidate their function in neurotransmission and disease.