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Related Experiment Videos

Membrane-associated molecules regulate the formation of layer-specific cortical circuits

V Castellani1, J Bolz

  • 1Institut National de la Santé et de la Recherche Médicale Unité 371 'Cerveau et Vision', 69500 Bron, France.

Proceedings of the National Academy of Sciences of the United States of America
|June 24, 1997
PubMed
Summary

Mammalian neocortex development involves specific axon collateral formation guided by layer-specific cues. These cues on cell membranes direct axons to target layers, ensuring proper neural circuit construction.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Cell Biology

Background:

  • The mammalian neocortex exhibits a precise columnar organization.
  • Radially oriented axon collaterals connect distinct cortical layers.
  • During development, axonal connections are layer-specific, forming only in target layers.

Purpose of the Study:

  • To investigate if positional cues within cortical layers regulate axonal collateral formation specificity.
  • To determine the role of layer-specific membrane cues in guiding axonal growth.

Main Methods:

  • Culturing explants of cortical cells on membranes from target and nontarget layers.
  • Analyzing axonal growth and branching on homogeneous and striped membrane substrates.
  • Examining axonal preference between target and nontarget layer membranes.

Related Experiment Videos

  • Assessing the impact of heat inactivation on membrane-associated cues.

    • Main Results:

    • Axons preferentially branched on membrane substrates from their in vivo target layers.
    • Cortical axons showed a clear preference for growing on target layer membranes when given a choice.
    • Heat inactivation of target layer membranes reduced axonal branching.
    • Altering nontarget layer membranes affected axonal branching in specific neuron populations.

    Conclusions:

    • Membrane-associated cues within individual cortical layers regulate axon collateral formation and target layer specificity.
    • Layer-specific cues induce or prevent axon collateral formation in different neuronal populations.
    • These cues provide crucial constraints for remodeling local circuits during neocortical development.