Abstract:
:Norepinephrine (NE) has been reported to modulate neuronal excitability and act as endogenous anticonvulsant. In the present study we used NE transporter knock-out mice (NET-KO), which are characterized by high levels of extracellular NE, to investigate the role of endogenous NE in seizure susceptibility. Seizure thresholds for cocaine (i.p.), pentylenetetrazol (i.v.) and kainic acid (i.v.) were compared in NET-KO, heterozygous (NET-HT) and wild type (NET-WT) female mice. The dose-response curve for cocaine-induced convulsions was significantly shifted to the right in NET-KO mice, indicating higher seizure thresholds. The threshold doses of pentylenetetrazol that induced clonic and tonic seizures were also significantly higher in NET-KO when compared to NET-WT mice. Similarly, NET-KO mice displayed higher resistance to convulsions engendered by kainic acid. For all drugs tested, the response of NET-HT mice was always intermediate. These data provide further support for a role of endogenous NE in the control of seizure susceptibility.
journal_name
Neurosci Lettjournal_title
Neuroscience lettersauthors
Kaminski RM,Shippenberg TS,Witkin JM,Rocha BAdoi
10.1016/j.neulet.2005.02.056keywords:
subject
Has Abstractpub_date
2005-07-01 00:00:00pages
51-5issue
1-2eissn
0304-3940issn
1872-7972pii
S0304-3940(05)00250-8journal_volume
382pub_type
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