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Related Experiment Videos

Tryptophan metabolism in developing chick brain.

O Suzuki, F Nagase, Yagi

    Brain Research
    |August 15, 1975
    PubMed
    Summary
    This summary is machine-generated.

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    Chick brain development shows critical tryptophan metabolism between embryonic day 17 and hatching. L-tryptophan injection significantly boosts 5-hydroxytryptamine (5-HT) levels, even in newborns, suggesting high early enzyme activity.

    Area of Science:

    • Neuroscience
    • Developmental Biology
    • Biochemistry

    Background:

    • Tryptophan, 5-hydroxytryptamine (5-HT), 5-hydroxyindoleacetic acid (5-HIAA), and monoamine oxidase (MAO) are crucial neurochemicals.
    • Understanding their developmental patterns in the brain is essential for comprehending neurological function.

    Purpose of the Study:

    • To investigate the normal occurrence patterns of tryptophan, 5-HT, 5-HIAA, and MAO activity in the developing chick brain.
    • To identify the critical developmental period for tryptophan metabolism in the chick brain.
    • To assess the in vivo formation of 5-HT from tryptophan in newly hatched and young chicks.

    Main Methods:

    • Quantification of tryptophan, 5-HT, 5-HIAA levels, and MAO activity in chick brains at various embryonic and post-hatch stages.

    Related Experiment Videos

  • Intraperitoneal injection of L-tryptophan in newly hatched and 2-week-old chicks.
  • Measurement of brain 5-HT levels post-injection.

    • Main Results:

    • Tryptophan levels decreased until embryonic day 17, then increased significantly until hatching and slightly thereafter.
    • 5-HT, 5-HIAA, and MAO were present early, increased gradually with a peak at day 14, and rose sharply from day 17 to hatching.
    • L-tryptophan administration markedly increased brain 5-HT in both newborn and 2-week-old chicks.

    Conclusions:

    • The period between embryonic day 17 and hatching represents a critical phase for tryptophan metabolism in the developing chick brain.
    • The rapid increase in 5-HT post-L-tryptophan injection suggests high tryptophan hydroxylase activity in newborn chick brains, comparable to adults.