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Serotoninergic development in the postnatal rat brain

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Summary

Various characteristics of the developing serotoninergic system in the brain of rats aged 1 to 28 days were studied biochemically.

The levels of the precursor amino acid tryptophan showed a maximal increase in the blood, brain and cerebrospinal fluid (CSF) during the 7th and 10th postnatal days. The development of tryptophan hydroxylase activity measuredin vivo by means of 5-hydroxytryptophan (5-HTP) accumulation after NSD 1015 was closely related to the 5-hydroxytryptamine (5-HT) levels at the various ages. 5-HTP accumulation and 5-HT levels increased most markedly after the second postnatal week. 5-Hydroxyindoleacetic acid (5-HIAA) levels were found to increase rapidly in the brain but somewhat more slowly in the CSF during the second week of postnatal development. Regional studies of 5-HTP accumulation after NSD 1015, 5-HT and 5-HIAA levels indicated a caudal to rostral way of maturation.

The disappearance of 5-HT was measured after inhibition of tryptophan hydroxylase with H 22/54. The half-life generally decreased in the various brain parts with advancing age, and in the younger animals the shortest half-life was found in the most caudal brain parts. At 28 days of age the half-life was similar in all brain parts studied. These results indicate the existence of an adult like nerve impulse flow in the 5-HT neurons in the brain stem region of the newborn rats. The results from this investigation clearly indicate that the maturation of the different biochemical parameters of the 5-HT pathways develop in a caudal to rostral direction.

The study also supports the view that tryptophan hydroxylase may be the limiting step in the development of the serotoninergic system.

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  1. Th. Hedner

    Present address: Department of Pharmacology, University of Göteborg, Göteborg, Sweden

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  1. Department of Pharmacology, University of Göteborg, Göteborg, Sweden

    P. Lundborg

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Hedner, T., Lundborg, P. Serotoninergic development in the postnatal rat brain. J. Neural Transmission 49, 257–279 (1980). https://doi.org/10.1007/BF01252130

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