Abstract:
:Effects of pharmacological manipulations which mimic or enhance histaminergic neuronal transmission were determined on the activity of 5-hydroxytryptaminergic neurons projecting to the hypothalamus of male rats. Intracerebroventricular administration of histamine decreased 5-hydroxytryptamine (5-HT) and increased 5-hydroxyindoleacetic acid (5-HIAA) concentrations in several hypothalamic nuclei; these effects were blocked by the histamine H1 receptor antagonist mepyramine but not the histamine H2 receptor antagonist zolantidine. Blockade of the 5-HT reuptake system by fluoxetine did not prevent histamine-induced decreases in 5-HT concentrations suggesting that histamine is not transported into nerve terminals via the 5-HT reuptake system to subsequently displace 5-HT stores. These data suggest that exogenous histamine increases 5-hydroxytryptaminergic neuronal activity through an action at histamine H1 receptors. In contrast, neither the histamine H3 receptor antagonist thioperamide, the histamine-N-methyltransferase inhibitor metoprine, nor combined thioperamide-metoprine treatment affected concentrations of 5-HT or 5-HIAA suggesting these agents, which purportedly enhance endogenous histaminergic transmission, do not affect 5-hydroxytryptaminergic neuronal activity. These results reveal that procedures commonly employed to study central actions of histamine differentially affect 5-hydroxytryptaminergic neuronal activity in the rat hypothalamus.
journal_name
Eur J Pharmacoljournal_title
European journal of pharmacologyauthors
Fleckenstein AE,Lookingland KJ,Moore KEdoi
10.1016/0014-2999(94)90367-0subject
Has Abstractpub_date
1994-03-11 00:00:00pages
35-42issue
1-2eissn
0014-2999issn
1879-0712pii
0014-2999(94)90367-0journal_volume
254pub_type
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