| Histaminergic modulation of acoustically induced running behavior in rats. | |
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MedLine Citation:
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PMID: 17362890 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Explosive running is a reliable initial component of audiogenic seizures (AS) induced by acoustic stimulation in genetically prone rodents. This profound locomotor activation is usually considered as a convulsive manifestation of AS although some studies attribute running to a panic-like response. Increase in central histamine activity has been shown to suppress clonic and tonic seizures. The present study examined the involvement of histaminergic mechanisms in the expression of running component of AS. Metoprine, an inhibitor of histamine-N-methyltransferase, was used to increase brain histamine level. Running was induced 4 and 24 h after intraperitoneal injection of metoprine or vehicle in rats of different strains. A brief sound stimulation elicited running followed by clonic-tonic convulsions in Krushinsky-Molodkina (KM) rats or running alone in AS-prone Wistar and WAG/Rij rats. In KM rats, metoprine exerted opposite effects on the main phases of AS. It increased the duration of running and decreased the duration and severity of clonic-tonic convulsions. In Wistar rats, metoprine produced a remarkable aggravation of running leading to its 2- to 3-fold prolongation. In WAG/Rij rats with mixed seizures (absence and audiogenic), the drug caused either aggravation or suppression of running behavior. These results suggest specific role for histaminergic system in the expression of behavioral components of AS. Suppressive role of histamine in clonic-tonic seizures is associated with facilitation of running suggesting specific effects of histamine on brainstem neuronal networks underlying these phases of AS. Possible roles of histaminergic mechanisms in seizure, motor and aversive aspects of sound-induced running are discussed. |
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Authors:
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Lyudmila V Vinogradova; Alla B Shatskova; Leena Tuomisto |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2007-02-21 |
Journal Detail:
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Title: Brain research Volume: 1148 ISSN: 0006-8993 ISO Abbreviation: Brain Res. Publication Date: 2007 May |
Date Detail:
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Created Date: 2007-04-24 Completed Date: 2007-07-25 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0045503 Medline TA: Brain Res Country: Netherlands |
Other Details:
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Languages: eng Pagination: 198-204 Citation Subset: IM |
Affiliation:
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Institute of Higher Nervous Activity and Neurophysiology, Russian Academy of Sciences, Butlerova Street 5A, Moscow 117485, Russia. lvinogradova@gmail.com <lvinogradova@gmail.com> |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Acoustic Stimulation Animals Brain / drug effects, metabolism*, physiopathology Brain Chemistry / drug effects, physiology* Brain Stem / drug effects, metabolism, physiopathology Enzyme Inhibitors / pharmacology Epilepsy, Reflex / metabolism*, physiopathology Epilepsy, Tonic-Clonic / etiology, metabolism, physiopathology Female Histamine / metabolism* Histamine N-Methyltransferase / antagonists & inhibitors, metabolism Hyperkinesis / chemically induced, metabolism*, physiopathology Injections, Intraperitoneal Male Nerve Net / drug effects, metabolism, physiopathology Neural Pathways / drug effects, metabolism, physiopathology Pyrimethamine / analogs & derivatives, pharmacology Rats Rats, Mutant Strains Rats, Wistar |
| Chemical | |
Reg. No./Substance:
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0/Enzyme Inhibitors; 51-45-6/Histamine; 58-14-0/Pyrimethamine; 7761-45-7/methodichlorophen; EC 2.1.1.8/Histamine N-Methyltransferase |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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