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Potassium cotransport at the rat choroid plexus

R F Keep1, J Xiang, A L Betz

  • 1Department of Surgery (Neurosurgery), University of Michigan, Ann Arbor 48109.

The American Journal of Physiology
|December 1, 1994
PubMed
Summary

The choroid plexus utilizes Na-K-ATPase and a bumetanide-sensitive cotransporter for potassium (K) transport, crucial for cerebrospinal fluid (CSF) secretion and K homeostasis.

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Area of Science:

  • Physiology
  • Neuroscience
  • Cell Biology

Background:

  • The choroid plexus plays a vital role in cerebrospinal fluid (CSF) production and maintaining ionic balance within the central nervous system.
  • Understanding the specific ion transport mechanisms involved is essential for comprehending CSF dynamics and neurological health.

Purpose of the Study:

  • To investigate the potassium (K) transport mechanisms in the isolated rat choroid plexus.
  • To elucidate the roles of specific transporters in K uptake and efflux, potentially linking them to CSF secretion and homeostasis.

Main Methods:

  • Utilized the radioactive tracer 86Rubidium (86Rb) to study K transport.
  • Employed inhibitors such as ouabain, bumetanide, barium, and quinidine to differentiate transport pathways.
  • Analyzed ion efflux under various conditions, including altered extracellular sodium (Na) concentration and presence of inhibitors.

Main Results:

  • Identified two primary K uptake mechanisms: ouabain-sensitive Na-K-adenosinetriphosphatase (48%) and bumetanide-sensitive Na-K-2Cl cotransport (46%).
  • Demonstrated that K efflux is primarily mediated by a bumetanide-sensitive cotransporter and K channels (inhibited by barium/quinidine).
  • Showed that the efflux cotransporter functions as a Na-K-Cl transporter, likely the same mechanism as influx, and is located on the apical membrane.

Conclusions:

  • The choroid plexus employs a bidirectional Na-K-Cl cotransporter, alongside Na-K-ATPase and K channels, for regulating K transport.
  • This cotransporter is hypothesized to be on the apical membrane and plays a significant role in CSF secretion and K homeostasis.

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