Cyclooxygenase 2 and intermittent hypoxia-induced spatial deficits in the rat.
Am J Respir Crit Care Med
; 168(4): 469-75, 2003 Aug 15.
Article
en En
| MEDLINE
| ID: mdl-12773326
ABSTRACT
Intermittent hypoxia (IH) during sleep, a critical feature of sleep apnea, induces significant neurobehavioral deficits in the rat. Cyclooxygenase (COX)-2 is induced during stressful conditions such as cerebral ischemia and could play an important role in IH-induced learning deficits. We therefore examined COX-1 and COX-2 genes and COX-2 protein expression and activity (prostaglandin E2 [PGE2] tissue concentration) in cortical regions of rat brain after exposure to either IH (10% O2 alternating with 21% O2 every 90 seconds) or sustained hypoxia (10% O2). In addition, the effect of selective COX-2 inhibition with NS-398 on IH-induced neurobehavioral deficits was assessed. IH was associated with increased COX-2 protein and gene expression from Day 1 to Day 14 of exposure. No changes were found in COX-1 gene expression after exposure to hypoxia. IH-induced COX-2 upregulation was associated with increased PGE2 tissue levels, neuronal apoptosis, and neurobehavioral deficits. Administration of NS-398 abolished IH-induced apoptosis and PGE2 increases without modifying COX-2 mRNA expression. Furthermore, NS-398 treatment attenuated IH-induced deficits in the acquisition and retention of a spatial task in the water maze. We conclude that IH induces upregulation and activation of COX-2 in rat cortex and that COX-2 may play a role in IH-mediated neurobehavioral deficits.
Buscar en Google
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Peroxidasas
/
Síndromes de la Apnea del Sueño
/
Prostaglandina-Endoperóxido Sintasas
/
Isoenzimas
/
Trastornos de la Memoria
/
Hipoxia
Tipo de estudio:
Etiology_studies
Límite:
Animals
Idioma:
En
Revista:
Am J Respir Crit Care Med
Asunto de la revista:
TERAPIA INTENSIVA
Año:
2003
Tipo del documento:
Article
País de afiliación:
Estados Unidos