Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1992-11-6
pubmed:abstractText
The purpose of the present study is to clarify the modulation of the biosynthesis of serotonin (5-HT) via the alpha 2-adrenoceptors in the brain. For this purpose, 5-hydroxytryptophan (5-HTP) accumulation was determined using an HPLC-ECD system in the presence of the inhibition of aromatic L-amino acid decarboxylase. Administration of alpha 2-adrenoceptor agonist, clonidine, produced a reduction of the in vivo 5-HTP accumulation in both the rat hippocampus and dorsal raphe nucleus. In addition, alpha 2-adrenoceptor antagonist, idazoxan, increased the 5-HTP accumulation in both the hippocampus and the dorsal raphe nucleus. In rats with catecholaminergic neurons denervated by pretreatment with 6-hydroxydopamine, clonidine failed to produce a reduction of 5-HTP accumulation in the dorsal raphe nucleus. On the other hand, hippocampal 5-HTP accumulation was decreased significantly. Brain tryptophan levels were unaffected by either clonidine or idazoxan. These results suggest that alpha 2-adrenoceptors might modulate serotonin biosynthesis and this modulation might be related to the neuroanatomical differences in the rat brain.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0304-3940
pubmed:author
pubmed:issnType
Print
pubmed:day
11
pubmed:volume
139
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
53-6
pubmed:dateRevised
2003-11-14
pubmed:meshHeading
pubmed:year
1992
pubmed:articleTitle
Alpha 2-adrenoceptor modulation of 5-HT biosynthesis in the rat brain.
pubmed:affiliation
First Department of Pharmacology, Hokkaido University School of Medicine, Sapporo, Japan.
pubmed:publicationType
Journal Article