Serotonin metabolism in neonatal rat brain during asphyxia and recovery

Acta Physiologica Scandinavica
T Hedner, P Lundborg

Abstract

Neonatal rats were exposed to 20 or 30 min of total or partial oxygen deprivation. During asphyxia and subsequent recovery the endogenous levels of tryptophan and 5-hydroxytryptamine (5-HT, serotonin) were measured. The activity of tryptophan hydroxylase, the first and rate limiting enzyme in the 5-HT synthesis pathway, was studied in vivo by measuring the accumulation of 5-hydroxytryptophan (5-HTP) after inhibition of aromatic L-amino acid decarboxylase with NSD 1015. During asphyxia there was a decrease in tryptophan hydroxylase activity in the whole brain and various regions studied. The levels of tryptophan, 5-HTP and 5-HT all increased after 30 min of recovery from asphyxia. In the whole brain, 5-HTP and 5-HT levels were normal 2 h after anoxia while tryptophan levels normalized more slowly to reach control values after 6 h. In the regional brain study, the 5-HTP levels returned quickly to control levels after asphyxia in the striatum and midbrain but not in the brainstem and hemispheres regions. The whole brain 5-HTP and 5-HT levels did not differ from controls 24 to 48 h after the asphyxia. Although the neonatal nervous system exhibits a great resistance to asphyxia, the metabolism of the neurotransmitter 5-HT is affecte...Continue Reading

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Citations

Aug 1, 1985·Pharmacology, Biochemistry, and Behavior·T HednerP Lundborg
Jan 1, 1993·Brain Research Bulletin·M E Dell'AnnaL Olson
Aug 1, 1994·International Journal of Developmental Neuroscience : the Official Journal of the International Society for Developmental Neuroscience·C S KimE E Lawson
Dec 1, 1989·Acta Paediatrica Japonica; Overseas Edition·S TakaragiK Yamada
May 1, 1983·Acta Physiologica Scandinavica·K IversenP Lundborg
May 1, 1996·Progress in Neurobiology·C NyakasP G Luiten
May 24, 2017·Frontiers in Cellular Neuroscience·Lancelot J MillarZoltán Molnár

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