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Related Experiment Videos

Neuronal domains in developing neocortex.

R Yuste1, A Peinado, L C Katz

  • 1Department of Neurobiology, Duke University Medical Center, Durham, NC 27710.

Science (New York, N.Y.)
|July 31, 1992
PubMed
Summary
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Newly discovered domains of coactive neurons in neonatal rat cortex, connected by gap junctions, may form the basis of adult brain architecture.

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Computational Neuroscience

Background:

  • The development of the mammalian neocortex, particularly its columnar organization, remains incompletely understood.
  • The neonatal rat cortex exhibits complex spontaneous activity patterns that may guide its structural and functional maturation.

Purpose of the Study:

  • To investigate the existence and characteristics of spontaneously coactive neuronal domains in the neonatal rat cortex.
  • To explore the role of nonsynaptic communication in the formation of early cortical networks.

Main Methods:

  • Utilized optical recordings on brain slices from neonatal rats labeled with the calcium indicator fura-2.
  • Examined neuronal activity in both tangential and coronal slice orientations to assess domain structure across cortical layers.

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  • Investigated neuronal coupling using gap junction blockers (implied by the mention of gap junctions).

    • Main Results:

    • Identified distinct domains of spontaneously coactive neurons in the neonatal rat cortex, measuring 50-120 micrometers in diameter.
    • These domains spanned multiple cortical layers and exhibited columnar-like organization, resembling adult cortical structures.
    • Observed that these developing domains were smaller than and distinct from adult sensory barrels in the somatosensory cortex.
    • Confirmed that neurons within these domains were interconnected via gap junctions, indicating nonsynaptic communication.

    Conclusions:

    • Nonsynaptic communication through gap junctions plays a crucial role in defining early multicellular patterns in the developing neocortex.
    • These discrete neuronal domains represent fundamental building blocks that may presage the functional columnar architecture of the adult mammalian brain.
    • The findings offer new insights into the developmental mechanisms underlying cortical organization and connectivity.