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Neuronal structural remodeling: is it all about access?

Jerry L Chen1, Elly Nedivi

  • 1Picower Institute for Learning and Memory, Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

Current Opinion in Neurobiology
|July 13, 2010
PubMed
Summary
This summary is machine-generated.

Neuronal structures in the adult brain are mostly stable, but some dendrites and axons dynamically remodel in response to experience, altering brain circuit connectivity.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Systems Neuroscience

Background:

  • Recent advances in stable labeling and two-photon microscopy allow observation of neuronal structural dynamics in vivo.
  • Adult neuronal structures are generally stable, but dynamic remodeling occurs in specific neuronal populations.

Purpose of the Study:

  • To investigate the dynamics of neuronal structures like dendrites and axons in the adult cerebral cortex.
  • To understand the functional implications of neuronal remodeling on brain circuit connectivity.

Main Methods:

  • Utilized stable labeling techniques for long-term observation.
  • Employed two-photon microscopy for deep tissue imaging of neuronal structures within intact cortical circuits.

Main Results:

  • Demonstrated that a subset of dendrites and axons exhibit significant structural plasticity.
  • Observed experience-dependent remodeling with cell type and laminar specificity.
  • Characterized the qualitative and quantitative features of dendritic spine, branch, and axonal remodeling.

Conclusions:

  • Neuronal remodeling, particularly axonal and dendritic arbor changes, may facilitate access to and modification of cortical circuits.
  • The functional significance lies in altering synaptic partnerships and circuit diagrams rather than just synapse number changes.