Effects of a neuronal nitric oxide synthase inhibitor on lipopolysaccharide-induced fever
Braz. j. med. biol. res
;
32(11): 1381-7, Nov. 1999. graf
Artículo
en Inglés
| LILACS
| ID: lil-248432
RESUMO
It has been demonstrated that nitric oxide (NO) has a thermoregulatory action, but very little is known about the mechanisms involved. In the present study we determined the effect of neuronal nitric oxide synthase (nNOS) inhibition on thermoregulation. We used 7-nitroindazole (7-NI, 1, 10 and 30 mg/kg body weight), a selective nNOS inhibitor, injected intraperitoneally into normothermic Wistar rats (200-250 g) and rats with fever induced by lipopolysaccharide (LPS) (100 µg/kg body weight) administration. It has been demonstrated that the effects of 30 mg/kg of 7-NI given intraperitoneally may inhibit 60 per cent of nNOS activity in rats. In all experiments the colonic temperature of awake unrestrained rats was measured over a period of 5 h at 15-min intervals after intraperitoneal injection of 7-NI. We observed that the injection of 30 mg/kg of 7-NI induced a 1.5oC drop in body temperature, which was statistically significant 1 h after injection (P<0.02). The coinjection of LPS and 7-NI was followed by a significant (P<0.02) hypothermia about 0.5oC below baseline. These findings show that an nNOS isoform is required for thermoregulation and participates in the production of fever in rats.
Texto completo:
Disponible
Índice:
LILACS (Américas)
Asunto principal:
Regulación de la Temperatura Corporal
/
Lipopolisacáridos
/
Óxido Nítrico Sintasa
/
Inhibidores Enzimáticos
/
Fiebre
/
Indazoles
/
Neuronas
Límite:
Animales
Idioma:
Inglés
Revista:
Braz. j. med. biol. res
Asunto de la revista:
Biologia
/
Medicina
Año:
1999
Tipo del documento:
Artículo
/
Congreso y conferencia
País de afiliación:
Brasil
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