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Preparation of Synaptoneurosomes from Mouse Cortex using a Discontinuous Percoll-Sucrose Density Gradient
08:30

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Published on: September 17, 2011

Requirement for protein synthesis at developing synapses.

Joseph Sebeo1, Kuangfu Hsiao, Ozlem Bozdagi

  • 1Fishberg Department of Neuroscience, Mount Sinai School of Medicine, New York, New York 10029, USA .

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|August 7, 2009
PubMed
Summary
This summary is machine-generated.

Protein synthesis and neural activity cooperate to stabilize developing synapses. Inhibiting protein synthesis during development increases synapse elimination, highlighting a novel regulatory mechanism for neural circuit formation.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Molecular Biology

Background:

  • Neural activity and protein synthesis are known to cooperatively shape synaptic responses for memory formation in adults.
  • The role of protein synthesis in developmental neural circuit shaping is not well understood.

Purpose of the Study:

  • To investigate the role of protein synthesis in regulating synapse elimination during neural development.
  • To identify key molecular targets involved in protein synthesis-dependent synaptic development.

Main Methods:

  • Inhibition of global or local protein synthesis in developing neural circuits.
  • Assessed effects on synaptic vesicle availability and synapse elimination.
  • Investigated the role of Ca(2+)/calmodulin-dependent protein kinase II (CaMKII) and protein kinase A (PKA) signaling.

Main Results:

  • Brief protein synthesis inhibition decreased synaptic vesicle availability and increased synapse elimination.
  • CaMKII activity is crucial; its inhibition mimicked the effects of protein synthesis inhibition.
  • Mature synapses showed reduced sensitivity to protein synthesis inhibition, correlating with a developmental switch from CaMKII to PKA regulation.

Conclusions:

  • Protein synthesis acts coordinately with neural activity to selectively stabilize synapses during development.
  • A novel mechanism involving protein synthesis, CaMKII, and PKA regulates presynaptic activity and synapse elimination.
  • These findings provide insights into the molecular basis of neural circuit development and synapse stabilization.