Abstract:
:Electrical stimulation of the trigeminal ganglion has been widely used as a model of nociception, characterizing migraine. This treatment is known to evoke release of neuropeptides and neurotransmitters from nerve fibers of the dura mater. On the basis of immunocytochemical investigations, we found that under normal conditions, surface membranes of Schwann cells surrounding nerve fibers in the supratentorial dura mater display kynurenine aminotransferase-immunoreaction (KAT-IR); also KAT-IR are the granules of mast cells and the cytoplasms of macrophages (histiocytes). In consequence of stimulation of the trigeminal ganglion, Schwann cells in the dura mater became conspicuously swollen while their KAT-IR decreased considerably; also KAT-IR of mast cells and macrophages decreased significantly. At the same time, nitric oxide synthase (NOS)-IR of nerve fibers in the dura mater increased, suggesting release of nitric oxide (NO), this is known to be involved in NMDA receptor activation leading to vasodilation followed by neurogenic inflammation. Because kynurenic acid (KYNA) is an antagonist of NMDA receptors, we hypothesize that KYNA and its synthesizing enzyme, KAT, may play a role in the prevention of migraine attacks.
journal_name
Exp Neuroljournal_title
Experimental neurologyauthors
Knyihár-Csillik E,Chadaide Z,Okuno E,Krisztin-Péva B,Toldi J,Varga C,Molnár A,Csillik B,Vécsei Ldoi
10.1016/j.expneurol.2003.12.001keywords:
subject
Has Abstractpub_date
2004-04-01 00:00:00pages
242-7issue
2eissn
0014-4886issn
1090-2430pii
S0014488603005934journal_volume
186pub_type
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journal_title:Experimental neurology
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journal_title:Experimental neurology
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