当前位置： SCI文献检索 > EUROPEAN JOURNAL OF PHARMACOLOGY期刊下所有文献 > The neuronal KCNQ channel opener retigabine inhibits locomotor activity and reduces forebrain excitatory responses to the psychostimulants cocaine, methylphenidate and phencyclidine.

The neuronal KCNQ channel opener retigabine inhibits locomotor activity and reduces forebrain excitatory responses to the psychostimulants cocaine, methylphenidate and phencyclidine.

Abstract：

:Many central stimulating drugs have a pronounced stimulatory effect on striatal and cortical activity which is associated to enhanced function of mesencephalic dopaminergic neurons. Mesencephalic KCNQ (also termed K(v)7) potassium channels suppress the basal activity of dopaminergic neurons in the substantia nigra and ventral tegmental area. These regions have extensive dopaminergic projections to the striatum and cortex, and positive modulation of KCNQ channel function may therefore potentially reduce the reinforcing impact of central stimulating drugs. We studied the effects of the principal neuronal KCNQ channel opener, retigabine, in rats exposed acutely to cocaine, methylphenidate (dopamine reuptake inhibitors) or phencyclidine (PCP, a psychotomimetic NMDA receptor antagonist). Retigabine (> or =1.0 mg/kg) inhibited cocaine, methylphenidate and PCP-stimulated locomotor activity. Also, retigabine reduced spontaneous locomotor activity. The inhibitory effect of retigabine on psychostimulant-induced locomotor activity was accompanied by a marked reduction in c-Fos expression, in particular the nucleus accumbens and primary motor cortex were responsive to retigabine pre-treatment. Notably, retigabine also reduced basal extracellular levels of striatal dopamine metabolites and partially prevented dopamine overflow in the striatum induced by dopamine reuptake blockade. In combination, these data suggest that retigabine reduces striatal and cortical excitability, thereby attenuating excitatory effects of central stimulating drugs in dopamine-rich areas of the rat forebrain. KCNQ channel openers may therefore be of potential relevance in the treatment of addiction states caused by abuse of psychostimulants.

journal_name

Eur J Pharmacol

journal_title

European journal of pharmacology

authors

Hansen HH,Andreasen JT,Weikop P,Mirza N,Scheel-Krüger J,Mikkelsen JD

doi

10.1016/j.ejphar.2007.05.029

subject

Has Abstract

pub_date

2007-09-10 00:00:00

pages

77-88

issue

1-3

eissn

0014-2999

issn

1879-0712

pii

S0014-2999(07)00643-7

journal_volume

570

pub_type

杂志文章

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The neuronal KCNQ channel opener retigabine inhibits locomotor activity and reduces forebrain excitatory responses to the psychostimulants cocaine, methylphenidate and phencyclidine.