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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Anticonvulsant effects of the 3-hydroxyanthranilic acid dioxygenase inhibitor NCR-631.

The kynurenine pathway intermediate 3-hydroxyanthranilic acid (3-HANA) is converted by 3-HANA 3,4-dioxygenase (3-HAO) to the pro-convulsive excitotoxin quinolinic acid. In the present study, the anticonvulsant effect of the 3-HAO inhibitor NCR-631 was investigated in models of chemically- and sound-induced seizures. Administration of NCR-631 i.c.v. at a dose of 300nmol in Sprague-Dawley rats was found to prolong the latency of occurrence of pentylenetetrazole (PTZ)-induced seizures. Also systemic pre-treatment with NCR-631 s.c. in N.M.R.I. mice subjected to PTZ-induced seizures provided an increase in the latency until onset of seizures, concomitant with a reduction in the severity of the seizures. However, the anticonvulsant effect of NCR-631 was short lasting (15-30min), and only observed at a dose of 250 mg/kg. A similar dose- and time-dependent anticonvulsant effect of NCR-631 was found in seizure-prone DBA/2J mice following sound-induced convulsions. Hence, the findings show that NCR-631 has anticonvulsant properties against generalized tonic-clonic seizures of different origin, suggesting that it may constitute a useful tool to study the role of kynurenines in various convulsive states.[1]


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