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Activity-dependent decrease in contact areas between subsurface cisterns and plasma membrane of hippocampal neurons.

Jung-Hwa Tao-Cheng1

  • 1NINDS Electron Microscopy Facility, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, 20892, USA. chengs@ninds.nih.gov.

Molecular Brain
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Summary
This summary is machine-generated.

Stimulating neurons causes subsurface cisterns (SSC) to detach from the plasma membrane (PM), potentially preventing calcium overload. This structural change in endoplasmic reticulum (ER) is reversible.

Keywords:
Calcium regulationER-PM contact sitesElectron microscopy

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • Subsurface cisterns (SSC) are specialized endoplasmic reticulum (ER) compartments near the plasma membrane (PM).
  • ER-PM contacts are implicated in regulating intracellular calcium levels.
  • The structural dynamics of SSC-PM contacts under neuronal stimulation are not well understood.

Purpose of the Study:

  • To investigate structural changes in SSC-PM contacts in hippocampal neurons during excitatory stimulation.
  • To determine the time course and reversibility of these structural alterations.

Main Methods:

  • Utilized electron microscopy to examine hippocampal neurons from rat cultures.
  • Applied excitatory stimuli, including high potassium (K+) and NMDA, to induce neuronal depolarization.
  • Quantified the number and length of SSC-PM contact areas.

Main Results:

  • A significant decrease in the number and length of SSC-PM contact areas was observed within 30 seconds of stimulation.
  • This reduction in contact area progressed over time.
  • The observed structural decoupling was reversible upon cessation of stimulation.

Conclusions:

  • Neuronal stimulation induces a rapid structural decoupling between SSC and PM.
  • This dynamic change suggests a potential functional decoupling in calcium regulation.
  • The decrease in SSC-PM contact may serve as a protective mechanism against calcium overload in neurons.