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[Brain development and glutamate].

Kohichi Tanaka1

  • 1Laboratory of Molecular Neuroscience, Medical Research Institute, Tokyo Medical and Dental University.

Brain and Nerve = Shinkei Kenkyu No Shinpo
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Summary
This summary is machine-generated.

Glutamate signaling, particularly via N-methyl-D-aspartate (NMDA) receptors, is crucial for normal brain development. Disrupting glutamate transporters in mice caused severe brain defects, confirming glutamate's essential role.

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Area of Science:

  • Neuroscience
  • Developmental Biology

Context:

  • Glutamate's role in early brain development is debated, with in vitro studies suggesting influence but in vivo models showing normal development upon receptor/release disruption.
  • Potential neurotransmitter compensation (GABA, glycine) may mask glutamate's effects in genetic models.

Purpose:

  • To investigate the direct impact of elevated extracellular glutamate on brain development.
  • To clarify glutamate's role by bypassing potential compensatory mechanisms.

Summary:

  • Reducing glutamate transporters (GLAST/GLT1) in double knockout (DKO) mice led to severe brain malformations (cortical, hippocampal, amygdalar) and perinatal death.
  • Impaired neuronal development, including stem cell proliferation and radial migration, was observed in DKO mice.
  • Deleting the N-methyl-D-aspartate (NMDA) receptor 1 subunit in DKO mice largely rescued these developmental defects.

Impact:

  • Provides direct in vivo evidence that glutamatergic activity, specifically through NMDA receptors, modulates critical early brain developmental processes.
  • Highlights the importance of glutamate homeostasis for proper neurodevelopment.