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A voltammetric and mathematical analysis of histaminergic modulation of serotonin in the mouse hypothalamus
Author(s) -
Samaranayake Srimal,
Abdalla Aya,
Robke Rhian,
Nijhout H. Frederik,
Reed Michael C.,
Best Janet,
Hashemi Parastoo
Publication year - 2016
Publication title -
journal of neurochemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.75
H-Index - 229
eISSN - 1471-4159
pISSN - 0022-3042
DOI - 10.1111/jnc.13659
Subject(s) - medial forebrain bundle , serotonin , histamine , neuroscience , histaminergic , chemistry , 5 ht receptor , histamine h3 receptor , forebrain , neurotransmission , pharmacology , receptor , psychology , biology , central nervous system , biochemistry , dopamine , striatum , antagonist
Histamine and serotonin are neuromodulators which facilitate numerous, diverse neurological functions. Being co‐localized in many brain regions, these two neurotransmitters are thought to modulate one another's chemistry and are often implicated in the etiology of disease. Thus, it is desirable to interpret the in vivo chemistry underlying neurotransmission of these two molecules to better define their roles in health and disease. In this work, we describe a voltammetric approach to monitoring serotonin and histamine simultaneously in real time. Via electrical stimulation of the axonal bundles in the medial forebrain bundle, histamine release was evoked in the mouse premammillary nucleus. We found that histamine release was accompanied by a rapid, potent inhibition of serotonin in a concentration‐dependent manner. We developed mathematical models to capture the experimental time courses of histamine and serotonin, which necessitated incorporation of an inhibitory receptor on serotonin neurons. We employed pharmacological experiments to verify that this serotonin inhibition was mediated by H 3 receptors. Our novel approach provides fundamental mechanistic insights that can be used to examine the full extent of interconnectivity between histamine and serotonin in the brain.Histamine and serotonin are co‐implicated in many of the brain's functions. In this paper, we develop a novel voltammetric method for simultaneous real‐time monitoring of histamine and serotonin in the mouse premammillary nucleus. Electrical stimulation of the medial forebrain bundle evokes histamine and inhibits serotonin release. We show voltammetrically, mathematically, and pharmacologically that this serotonin inhibition is H 3 receptor mediated.