Central oxidative stress depresses baroreflex function in spontaneously hypertensive rats / 中国应用生理学杂志
Chinese Journal of Applied Physiology
;
(6): 445-448, 2012.
Article
Dans Chinois
| WPRIM
| ID: wpr-358718
ABSTRACT
<p><b>OBJECTIVE</b>To investigate the effects of central oxidative stress on the baroreflex function and central mechanism responsible for the attenuated baroreflex sensitivity (BRS) in spontaneously hypertensive rats (SHR).</p><p><b>METHODS</b>Male 24-week-old SHR and normal rats were anesthetized with urethane and alpha-chloralose. Intravenous injection of phenylephrine (PE) and sodium nitroprusside (NP) evoked arterial baroreflex. The ratio of change in heart rate (HR) to change in mean aortic pressure (MAP) represented the baroreflex sensitivity (BRS). Alteration in BRS was evaluated before and after intracerebroventricular administration of superoxide dismutase (SOD) mimetic tempol or SOD inhibitor diethyldithiocarbamic acid (DETC).</p><p><b>RESULTS</b>BRS in hypertensive rats was significantly lower than that in normal rats (PE P < 0.01, NP P < 0.01). Intracerebroventricular administration of Tempol significantly improved BRS in hypertensive rats (P < 0.05), but not in normal rats. In contrast, DETC decreased BRS to a greater extent in normal group than in hypertension group (P < 0.05). MDA content in hypothalamus of hypertensive rats was higher than that of normal rats (P < 0.01), whereas total antioxidant capacity, total SOD, CuZn-SOD, catalase activity were lower in hypertensive rats than in normal rats (P < 0.05).</p><p><b>CONCLUSION</b>Attenuated baroreflex function in hypertensive rats is associated with central oxidative stress, which is linked to decreases in antioxidant enzyme activity and antioxidative capacity in the brain.</p>
Texte intégral:
Disponible
Indice:
WPRIM (Pacifique occidental)
Sujet Principal:
Physiologie
/
Rats de lignée SHR
/
Système nerveux central
/
Baroréflexe
/
Stress oxydatif
/
Métabolisme
Limites du sujet:
Animaux
langue:
Chinois
Texte intégral:
Chinese Journal of Applied Physiology
Année:
2012
Type:
Article
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