Abstract:
OBJECTIVE:To examine the efficacy of L-kynurenine and a novel kynurenic acid derivative on the nitroglycerin-induced calmodulin-dependent protein kinase II alpha (CamKIIalpha) and calcitonin gene-related peptide (CGRP) expression changes in the rat caudal trigeminal nucleus. BACKGROUND:Systemic administration of the nitric oxide donor nitroglycerin can trigger an attack in migraineurs. In the rat, nitroglycerin activates second-order neurons in the caudal trigeminal nucleus, and increases expression of the CamKIIalpha and decreases that of the CGRP there. As glutamatergic mechanisms may be crucial in trigeminal pain processing, the aim of our study was to examine the effects of L-kynurenine, a metabolic precursor of the N-methyl D-aspartate receptor antagonist kynurenic acid, on the nitroglycerin-induced changes in CamKIIalpha and CGRP immunoreactivity. METHODS:One hour before the nitroglycerin (10 mg/kg bodyweight, s.c.) injection, the animals were pretreated with L-kynurenine (300 mg/kg bodyweight, i.p.) or 2-(2-N,N-dimethylaminoethylamine-1-carbonyl)-1H-quinolin-4-one hydrochloride (300 mg/kg bodyweight, i.p.), a novel kynurenic acid derivative. Four hours later, the rats were perfused transcardially and the cervical spinal cord segments were removed for immunohistochemistry. Results.- L-kynurenine and 2-(2-N,N-dimethylaminoethylamine-1-carbonyl)-1H-quinolin-4-one hydrochloride pretreatment attenuated the nitroglycerin-induced changes in CamKIIalpha and CGRP immunoreactivity in the rat caudal trigeminal nucleus. CONCLUSIONS:These findings suggest a mechanism by which the inhibition of the excitatory amino acid receptors by kynurenic acid and its derivatives can alter trigeminal nociception.
journal_name
Headachejournal_title
Headacheauthors
Vámos E,Fejes A,Koch J,Tajti J,Fülöp F,Toldi J,Párdutz A,Vécsei Ldoi
10.1111/j.1526-4610.2009.01574.xsubject
Has Abstractpub_date
2010-05-01 00:00:00pages
834-43issue
5eissn
0017-8748issn
1526-4610pii
HED1574journal_volume
50pub_type
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