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D-serine availability modulates prefrontal cortex inhibitory interneuron development and circuit maturation.

Oluwarotimi O Folorunso1,2, Stephanie E Brown3, Jugajyoti Baruah3,4

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This summary is machine-generated.

D-serine is crucial for developing cortical interneurons and maintaining brain excitation-inhibition balance. Serine racemase knockout mice show impaired interneuron development and function, highlighting D-serine

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Area of Science:

  • Neuroscience
  • Developmental Neuroscience
  • Synaptic Plasticity

Background:

  • Cortical circuit function relies on balanced excitation and inhibition (E/I), primarily mediated by GABAergic interneurons.
  • Glutamate signaling via N-methyl-D-aspartate receptors (NMDARs) is vital for interneuron development.
  • D-serine, a co-agonist for NMDARs, is synthesized by serine racemase (SR).

Purpose of the Study:

  • To investigate the role of D-serine availability in the development of cortical interneurons (CINs) and inhibitory synapses.
  • To examine the impact of serine racemase deficiency on the prenatal and postnatal development of the prelimbic cortex (PrL).

Main Methods:

  • Utilized constitutive serine racemase knockout (SR-/-) mice.
  • Analyzed GABAergic interneuron markers (Lhx6, GAD67, PV, Sst) and NMDAR subunit NR1 expression.
  • Assessed cell proliferation and synaptic function (inhibitory postsynaptic potentials) in the PrL.

Main Results:

  • SR-/- mice exhibited altered GABA levels and increased proliferation in the ganglionic eminence during embryonic development.
  • A significant reduction in GAD67+ and parvalbumin (PV)+ interneuron density was observed in the PrL of SR-/- mice.
  • SR deficiency led to diminished inhibitory postsynaptic potentials in layer 2/3 pyramidal neurons.

Conclusions:

  • D-serine availability is essential for proper prenatal development of cortical interneurons.
  • Adequate D-serine levels are critical for the maturation of postnatal cortical circuits and synaptic function.