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Developmental changes in serotonin levels in the chick spinal cord and brain
N Okado1, S Shibanoki, K Ishikawa
1Department of Anatomy, University of Tsukuba, Ibaraki, Japan.
Brain Research. Developmental Brain Research
|December 1, 1989
Summary
This study tracked serotonin (5-HT) and its metabolite (5-HIAA) in developing chicks. Spinal cord levels initially rose, peaking post-hatching, then declined, while brain levels steadily increased.
Area of Science:
- Neuroscience
- Developmental Biology
- Biochemistry
Background:
- Serotonin (5-HT) and its metabolite 5-hydroxyindoleacetic acid (5-HIAA) are crucial neurotransmitters.
- Understanding their developmental trajectory is key to comprehending nervous system maturation.
Purpose of the Study:
- To investigate the developmental changes of 5-HT and 5-HIAA in the chick spinal cord and brain.
- To map the regional and temporal distribution of these compounds during embryonic and post-hatching periods.
Main Methods:
- High-performance liquid chromatography with electrochemical detection (HPLC-ECD).
- Immunohistochemistry.
- Analysis of spinal cord and brain tissue from embryonic day 6 (E6) to post-hatching day 120 (P120).
Main Results:
- Initially, 5-HT and 5-HIAA were low in the spinal cord but high in surrounding non-neuronal tissue.
- Spinal cord 5-HT concentrations showed regional variations (cervical, thoracic, lumbar) that shifted with development.
- Spinal cord 5-HT peaked around post-hatching day 7 before declining, while brain 5-HT levels consistently increased throughout development.
Conclusions:
- The distribution and concentration of 5-HT and 5-HIAA undergo significant developmental changes in the chick nervous system.
- These changes suggest distinct roles and regulatory mechanisms for serotonin in the developing spinal cord versus the brain.