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Short-term effect of stress on tyrosine hydroxylase activity.

Abstract：

:The short-term influences of stress on the activities of tyrosine hydroxylase in vivo and in vitro were examined in mice. The in vivo tyrosine hydroxylase activity was estimated by the rate of dopa accumulation which was measured at 30 min after the injection of NSD-1015 (100 mg kg), an aromatic l-amino acid decarboxylase inhibitor, intraperitoneally and was compared with tyrosine hydroxylase activity measured in vitro. For the in vivo assay, both the accumulation of dopa (tyrosine hydroxylase activity) and that of 5-hydroxytryptophan (tryptophan hydroxylase activity) and the levels of monoamines and the metabolites (noradrenalin, adrenalin, dopamine, normetanephrine, 3-methoxytyramine and serotonin) and those of precursor amino acids, tyrosine and tryptophan, were investigated in ten different brain regions and in adrenals. The amount of dopa accumulation in the brain as a consequence of decarboxylase inhibition, in vivo tyrosine hydroxylase activity, was significantly increased by stress, in nerve terminals (striatum, limbic brain, hypothalamus, cerebral cortex and cerebellum) and also in adrenals. The effect of stress on tyrosine hydroxylase activity in vitro at a subsaturating concentration of 6-methyltetrahydropterin cofactor was also observed in nerve terminals (striatum, limbic brain, hypothalamus, and cerebral cortex). The amount of 5-hydroxytryptophan accumulation, the in vivo tryptophan hydroxylase activity, was also significantly increased in bulbus olfactorius, limbic brain, cerebral cortex, septum and lower brain stem. The influence of stress was also observed on the levels of precursor amino acids, tyrosine and tryptophan and monoamines in specific brain parts. These results suggest that the stress influences both catecholaminergic neurons and serotonergic neurons in nerve terminals in the brain. This effect was also observed on tyrosine hydroxylase activity in vitro in nerve terminals. However, in adrenals, the influence by stress was not observed on the in vitro activity, although dopa accumulation was increased.

journal_name

Neurochem Int

journal_title

Neurochemistry international

authors

Oka K,Ashiba G,Kiss B,Nagatsu T

doi

10.1016/0197-0186(82)90079-1

subject

Has Abstract

pub_date

1982-01-01 00:00:00

pages

375-82

issue

5

eissn

0197-0186

issn

1872-9754

pii

0197-0186(82)90079-1

journal_volume

4

pub_type

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