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Rapid Detection of Neurodevelopmental Phenotypes in Human Neural Precursor Cells (NPCs)
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Clonidine accumulation in human neuronal cells.

Wiebke Fischer1, Reinhard H H Neubert, Matthias Brandsch

  • 1Membrane Transport Group, Biozentrum, Martin-Luther-University Halle-Wittenberg, Weinbergweg 22, D-06120 Halle, Germany.

European Journal of Pharmaceutical Sciences : Official Journal of the European Federation for Pharmaceutical Sciences
|September 18, 2007
PubMed
Summary
This summary is machine-generated.

Neurons actively absorb clonidine, a medication that acts on alpha(2)-adrenergic receptors. This cellular uptake mechanism, distinct from receptor binding, helps clear clonidine from the brain's extracellular fluid.

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Area of Science:

  • Neuropharmacology
  • Cell Biology

Background:

  • Clonidine crosses the blood-brain barrier to interact with alpha(2)-adrenergic receptors and imidazoline binding sites.
  • Neuronal uptake may be a significant mechanism for clonidine removal from the extracellular fluid.

Purpose of the Study:

  • To investigate the hypothesis that neuronal cells actively take up clonidine.
  • To characterize the mechanism of clonidine uptake in neuroblastoma cells.

Main Methods:

  • Utilized radiolabeled [(3)H]clonidine to study uptake in SH-SY5Y neuroblastoma cells.
  • Assessed the effects of ion gradients, pH, and competing substances on clonidine uptake.
  • Determined kinetic parameters (K(t)) for the uptake process.

Main Results:

  • [(3)H]clonidine uptake was linear for 1 minute and occurred against a concentration gradient (50-70-fold accumulation).
  • Uptake was independent of Na(+) and Cl(-) gradients but sensitive to extracellular pH (inhibited at pH 6.0).
  • Specific inhibitors (clonidine, guanabenz, imipramine, etc.) significantly reduced uptake, while others had no effect. Saturable kinetics with K(t) = 0.7 mM were observed.

Conclusions:

  • SH-SY5Y neuroblastoma cells exhibit a specific, concentrative, and saturable mechanism for clonidine uptake.
  • This active transport process contributes to the removal of clonidine from the extracellular environment, in addition to receptor binding.