Author(s): Reader TA, Brière R, Grondin L, Ferron A
The catecholamines noradrenaline, dopamine, adrenaline, the indoleamine 5-hydroxy-tryptamine (5-HT; serotonin), and some of their major metabolites were assayed, using high performance liquid chromatography (HPLC), in the neocortex of normal rats as well as in animals in which 5-HT synthesis had been inhibited with p-chlorophenylalanine. Besides important depletions in serotonin and in 5-hydroxyindole-3-acetic acid, noradrenaline levels were significantly reduced, but the content in 3-methoxy-4-hydroxyphenylglycol was increased, indicating an augmented utilization of this amine. The levels of dopamine and 3-methoxytyramine were also reduced, although homovanillic acid and 3,4-dihydroxyphenylacetic acid levels remained constant. The spontaneous unitary activity of identified noradrenergic neurons in the Locus coeruleus was increased, indicating an hyperactivity of this system. These results can be interpreted in relation to functional interactions between the catecholamines and serotonin; i.e.: a decrease in endogenous serotonin results in the loss of a negative feedback control of noradrenaline release.
Referred From: https://www.ncbi.nlm.nih.gov/pubmed/2427962
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