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Choroid plexus taurine transport

R F Keep1, J Xiang

  • 1Department of Surgery (Neurosurgery), University of Michigan, Ann Arbor 48109-0532, USA.

Brain Research
|April 9, 1996
PubMed
Summary
This summary is machine-generated.

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Brain taurine levels decrease during osmotic stress. This study shows choroid plexus taurine transport is regulated by calmodulin and ion gradients, influencing taurine loss from the brain.

Area of Science:

  • Neuroscience
  • Cell Physiology
  • Biochemistry

Background:

  • The brain loses taurine during hypo-osmotic stress and ischemia.
  • Mechanisms regulating this taurine loss are not fully understood.
  • The choroid plexus is a key brain-blood interface involved in regulating cerebrospinal fluid (CSF) composition.

Purpose of the Study:

  • To investigate taurine transport by the isolated rat choroid plexus.
  • To understand how taurine transport is regulated in the context of brain volume regulation.

Main Methods:

  • Isolated rat choroid plexus preparation.
  • Measurement of taurine uptake kinetics (Vmax, Km).
  • Assessment of the effects of calmodulin inhibitors (trifluoperazine, W-7) and niflumic acid on taurine transport.

Related Experiment Videos

  • Investigation of taurine efflux under hypo-osmotic stress and varying extracellular taurine concentrations.

    • Main Results:

    • Choroid plexus taurine uptake is dependent on sodium (Na+) and chloride (Cl-).
    • Taurine uptake is calmodulin-dependent.
    • Taurine efflux from the choroid plexus is stimulated by hypo-osmotic stress and extracellular taurine.
    • Niflumic acid reduces the efflux stimulated by both hypo-osmotic stress and extracellular taurine.

    Conclusions:

    • The choroid plexus plays a role in regulating brain taurine levels.
    • Calmodulin and ion gradients are critical for choroid plexus taurine uptake.
    • Extracellular taurine concentration may be a more significant factor than direct hypo-osmolality in long-term brain taurine loss via the choroid plexus.