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Developmental changes in brain kynurenic acid concentrations.

M F Beal1, K J Swartz, O Isacson

  • 1Neurochemistry Laboratory, Massachusetts General Hospital, Boston 02114.

Brain Research. Developmental Brain Research
|July 24, 1992
PubMed
Summary
This summary is machine-generated.

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Kynurenic acid, an excitatory amino acid antagonist, is elevated in fetal rat brains before birth. Its levels rapidly decrease after birth, coinciding with increased neurotransmitter concentrations and synapse development.

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Neurochemistry

Background:

  • Excitatory amino acid levels are critical for neuronal development.
  • Kynurenic acid (KYNA) acts as an endogenous antagonist to excitatory amino acids.

Purpose of the Study:

  • To investigate the developmental changes in KYNA and related substances in fetal and neonatal rat brains and primate cerebral cortex.
  • To understand the role of KYNA in regulating neuronal development during critical prenatal and postnatal periods.

Main Methods:

  • Quantification of kynurenic acid, L-kynurenine, L-tryptophan, dopamine, norepinephrine, 3,4-dihydroxyphenylacetic acid, and homovanillic acid.
  • Analysis of brain tissue from fetal and neonatal rats, and fetal baboon cerebral cortex.

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Main Results:

  • Rat fetal brain KYNA levels increased 4-5 fold prenatally, declining rapidly post-birth to adult levels by 7 days.
  • L-Kynurenine and L-tryptophan also showed prenatal increases followed by postnatal declines.
  • Dopamine and norepinephrine levels increased prenatally and continued rising postnatally.
  • Fetal baboon cerebral cortex exhibited elevated KYNA concentrations compared to adults.

Conclusions:

  • Significant changes in KYNA concentrations occur around the time of birth.
  • High prenatal KYNA levels may inhibit neurite branching and excitatory synapse formation.
  • Postnatal development of excitatory synapses may be facilitated by the decline in KYNA levels.