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Elevated intracellular Na+ concentrations in developing spinal neurons.

Casie Lindsly1, Carlos Gonzalez-Islas1,2, Peter Wenner1

  • 1Physiology Department, Emory University, School of Medicine, Atlanta, Georgia, USA.

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|December 28, 2016
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Summary
This summary is machine-generated.

Intracellular sodium levels (Na+in) are higher in developing neurons than mature ones, impacting neuronal excitability. This study reveals developmental changes in Na+in, similar to chloride, affecting neural development and function.

Keywords:
SBFIATPasechick embryoionic gradientsodium

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Cellular Physiology

Background:

  • Intracellular chloride (Cl-in) is higher in developing neurons, influencing excitability.
  • Intracellular sodium (Na+in) levels are assumed constant during neuronal development.
  • Understanding ion gradients is crucial for neural development and disease.

Purpose of the Study:

  • To investigate developmental changes in intracellular sodium (Na+in) in neurons.
  • To determine if Na+in levels differ between embryonic and mature spinal neurons.
  • To elucidate the mechanisms regulating Na+in during neuronal development.

Main Methods:

  • Used the sodium indicator SBFI to measure intracellular sodium (Na+in) in embryonic spinal motoneurons and interneurons.
  • Employed retrograde labeling for in vitro analysis of Na+in.
  • Investigated the effects of neuronal activity, ion channel blockers (NKCC1, Na+/K+ ATPase), and external sodium on Na+in.

Main Results:

  • Intracellular sodium (Na+in) is significantly higher in embryonic spinal neurons (~60 mM) compared to mature neurons (~30 mM).
  • Na+in levels decrease during late embryonic development.
  • Blocking NKCC1 reduced Na+in, indicating its role in regulating sodium levels.

Conclusions:

  • Embryonic neurons exhibit a weaker sodium gradient compared to mature neurons.
  • Na+in levels decrease during neuronal maturation, mirroring developmental changes in chloride.
  • These findings have implications for understanding neuronal excitability and developmental disorders.