Intrathecal administration of a new nitric oxide donor, NOC-18, produces acute thermal hyperalgesia in the rat.
J Neurol Sci
; 153(1): 1-7, 1997 Dec 09.
Article
en En
| MEDLINE
| ID: mdl-9455970
ABSTRACT
A nitric oxide releasing compound, NOC-18, was injected intrathecally in order to determine the role of NO in spinal nociceptive mechanisms in rats. The nociceptive threshold was evaluated by the radiant heat tail-flick test. The effects of intrathecal injection of N-nitro-L-arginine methyl ester (L-NAME), an NO synthase inhibitor; methylene blue (MB), a soluble guanylate cyclase inhibitor and hemoglobin (Hb), an NO scavenger, on the nociceptive threshold were measured in the presence and absence of 0.1, 1 and 10 microg of NOC-18. The results were compared with a control group of rats which were injected with the same volume of normal saline. NOC-18 caused a dose-dependent curtailment of the tail-flick latency during the period from 15 to 150 min. L-NAME, MB and Hb all produced prolongation of the tail-flick latency during the same time period. The hyperalgesia induced by this concentration range of NOC-18 was completely blocked by Hb, but was not affected by either L-NAME or MB. These findings indicate that NO plays a direct role in thermal hyperalgesia in the spinal cord, and that an another pathway in addition to the NO-cGMP pathway may be involved.
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Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Hiperalgesia
/
Óxido Nítrico
/
Compuestos Nitrosos
Límite:
Animals
Idioma:
En
Revista:
J Neurol Sci
Año:
1997
Tipo del documento:
Article
País de afiliación:
Japón