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Related Experiment Videos

Oxygen-sensing persistent sodium channels in rat hippocampus.

A K Hammarström1, P W Gage

  • 1Membrane Biology Program, John Curtin School of Medical Research, Australian National University, PO Box 334, Canberra, ACT, 2601 Australia. anna.hammarstrom@anu.edu.au

The Journal of Physiology
|November 18, 2000
PubMed
Summary

Hypoxia significantly increases persistent sodium channel activity in hippocampal neurons. This effect, mediated by redox reactions in auxiliary proteins, can be reversed by reducing agents and blocked by specific inhibitors.

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Area of Science:

  • Neuroscience
  • Cellular Physiology
  • Molecular Biology

Background:

  • Persistent sodium channels play a crucial role in neuronal excitability.
  • The impact of hypoxia on persistent sodium channel activity is not fully understood.
  • Investigating the mechanisms underlying hypoxia-induced channel modulation is essential for understanding neuronal function under stress.

Purpose of the Study:

  • To investigate the effect of hypoxia on persistent sodium channel activity in cultured hippocampal neurons.
  • To elucidate the molecular mechanisms involved in hypoxia-induced modulation of sodium channels.
  • To determine if the plasma membrane can sense oxygen levels through sodium channels.

Main Methods:

  • Electrophysiological recordings (cell-attached and inside-out patches) from cultured hippocampal neurons.

Related Experiment Videos

  • Application of hypoxic conditions and chemical agents like sodium cyanide (NaCN), lidocaine, tetrodotoxin (TTX), R56865, dithiothreitol (DTT), and reduced glutathione (GSH).
  • Analysis of mean current (IU) of persistent sodium channels under various experimental conditions.

    • Main Results:

    • Hypoxia significantly increased persistent sodium channel activity in both cell-attached and inside-out patches.
    • The hypoxia-induced increase in channel activity was prominent at specific membrane potentials and could be blocked by lidocaine, TTX, or R56865.
    • Reducing agents like DTT and GSH reversed the hypoxia-induced increase in sodium channel activity, suggesting a redox-sensitive mechanism.

    Conclusions:

    • Persistent sodium channels in neurons can sense oxygen levels, with hypoxia triggering increased channel activity.
    • A redox reaction, likely involving an auxiliary regulatory protein co-localized in the plasma membrane, mediates this hypoxia-induced increase.
    • These findings provide insights into neuronal responses to hypoxic conditions and potential therapeutic targets.