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Related Experiment Videos

A Cl- pump in rat brain neurons

C Inagaki1, M Hara, X T Zeng

  • 1Department of Pharmacology, Kansai Medical University, Osaka, Japan.

The Journal of Experimental Zoology
|July 1, 1996
PubMed
Summary
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Biochemical and biophysical research communications·2001

A novel chloride transporter, the chloride ATPase (Cl(-)-ATPase), actively pumps chloride ions out of rat brain neurons. Its activity is regulated by membrane potential and phosphoinositides, influencing chloride distribution during neuronal development.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • The plasma membrane possesses a chloride-stimulated and ethacrynic acid-sensitive ATPase (Cl(-)-ATPase) in rat brain, a potential active outwardly directed chloride translocating system.
  • Understanding the biochemical properties of Cl(-)-ATPase and ATP-dependent chloride transport is crucial for elucidating neuronal chloride homeostasis.

Purpose of the Study:

  • To characterize the biochemical properties of the rat brain Cl(-)-ATPase.
  • To investigate the role of Cl(-)-ATPase in active chloride transport and its regulation in neurons.
  • To examine the developmental and regional changes in neuronal chloride distribution mediated by Cl(-) transporters.

Main Methods:

  • Biochemical characterization of Cl(-)-ATPase, including kinetic analysis (Km values for ATP and Cl(-)), nucleotide specificity, pH dependency, and ethacrynic acid sensitivity.

Related Experiment Videos

  • Reconstitution of purified Cl(-)-ATPase/pump into liposomes to assess activity modulation by phosphatidylinositol-4-monophosphate, membrane potential, and protonophores.
  • Measurement of intracellular chloride levels ([Cl(-)]i) using Cl(-)-sensitive fluorescent probes in cultured hippocampal neurons, assessing the effects of ethacrynic acid and furosemide.

    • Main Results:

    • Biochemical data strongly suggest Cl(-)-ATPase functions as an ATP-driven chloride pump.
    • Reconstituted pump activity is enhanced by phosphatidylinositol-4-monophosphate and modulated by membrane potential and protonophores, indicating an electrogenic Cl(-) transporter.
    • In cultured neurons, ethacrynic acid increased [Cl(-)]i, while furosemide decreased it, with distinct regional (perikarya vs. dendrites) and developmental (early vs. late culture stages) differences observed.

    Conclusions:

    • The Cl(-)-ATPase is identified as an electrogenic chloride transporter in the rat brain, likely regulated by phosphoinositide turnover.
    • Neuronal chloride homeostasis is maintained by a balance of active transport mechanisms, including the Cl(-)-ATPase and Na+/K+/Cl- cotransporter.
    • Region-specific localization and developmental regulation of chloride transporters contribute to the uneven and age-dependent distribution of chloride in neurons.