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Spontaneous activity in the developing mouse midbrain driven by an external pacemaker.

Wendy Rockhill1, Jennifer L Kirkman, Martha M Bosma

  • 1Department of Biology, University of Washington, Seattle, Washington 98195, USA.

Developmental Neurobiology
|May 19, 2009
PubMed
Summary
This summary is machine-generated.

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Spontaneous activity (SA) in the developing mouse midbrain originates from hindbrain serotonergic neurons. This activity is crucial for establishing neural networks, with axon growth potentially regulating its onset.

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Neurophysiology

Background:

  • Central nervous system (CNS) development relies on spontaneous activity (SA) for network formation.
  • The precise origins and propagation mechanisms of SA in the embryonic midbrain remain incompletely understood.

Purpose of the Study:

  • To identify the origin and pathway of spontaneous activity (SA) in the embryonic mouse midbrain.
  • To investigate the role of hindbrain structures and serotonergic neurons in driving midbrain SA.
  • To explore the potential for intrinsic midbrain activity initiation.

Main Methods:

  • In vivo electrophysiological recordings in embryonic mice.
  • Lesion studies to remove hindbrain influence.
  • Pharmacological manipulations to alter neuronal excitability.

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  • Axonal tracing and anatomical analysis.

    • Main Results:

    • Spontaneous activity (SA) in the mouse midbrain is most prominent at embryonic day 12.5.
    • SA originates in hindbrain midline serotonergic cell bodies and propagates via axons through the isthmus into the midbrain.
    • Midbrain SA involves GABAergic and cholinergic neurons and travels rostrally.
    • Removal of the hindbrain abolishes midbrain SA, but pharmacological intervention can induce intrinsic activity initiation.
    • Axon elongation of hindbrain serotonergic projections correlates with the onset of midbrain SA.

    Conclusions:

    • The embryonic midbrain's spontaneous activity (SA) is driven by a pacemaker located in the hindbrain.
    • Hindbrain-derived SA waves are essential for establishing midbrain neural networks.
    • Axonal development of serotonergic pathways plays a critical role in regulating the initiation and propagation of SA during CNS development.