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Activity-dependent cortical target selection by thalamic axons

S M Catalano1, C J Shatz

  • 1Howard Hughes Medical Institute and Department of Molecular and Cell Biology, University of California, Berkeley, CA 94720-3200, USA. scatalan@cco.caltech.edu

Science (New York, N.Y.)
|July 24, 1998
PubMed
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Neural activity is crucial for guiding developing axons to their correct targets in the brain. Blocking nerve impulses during development disrupts normal connections, leading to disorganized brain wiring.

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Neuroanatomy

Background:

  • Neural connections form through initial activity-independent processes, followed by activity-dependent refinement.
  • The role of neural activity in the precise targeting of thalamocortical axons remains under investigation.

Purpose of the Study:

  • To investigate the necessity of neural activity for accurate axon pathfinding and target selection in the developing visual system.
  • To determine if spontaneous neural activity influences the topographic organization of thalamocortical projections.

Main Methods:

  • Utilized tetrodotoxin (TTX) to block sodium action potentials in the developing feline brain.
  • Infused TTX intracranially during the critical period of thalamocortical axon targeting.
  • Examined the projection patterns of lateral geniculate nucleus (LGN) axons to the visual cortex and subplate.

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Main Results:

  • Activity blockade led to aberrant projections, with many LGN axons targeting the subplate instead of the visual cortex.
  • Thalamocortical axons that did reach the visual cortex exhibited significant topographic disorganization.
  • The precision of axonal targeting was markedly reduced in TTX-infused subjects.

Conclusions:

  • Neural activity is essential for the initial, activity-dependent targeting decisions of thalamic axons.
  • Activity blockade disrupts the normal trajectory and precision of thalamocortical projections during development.
  • This suggests a critical role for spontaneous neural impulses in establishing accurate brain circuitry.