Effect of deoxynivalenol on action potentials of cultured cardiomyocytes and the protective effects of selenium / 中华预防医学杂志
Chinese Journal of Preventive Medicine
;
(12): 423-425, 2003.
Artículo
en Chino
| WPRIM
| ID: wpr-291834
ABSTRACT
<p><b>OBJECTIVE</b>To study the effect of deoxynivalenol (DON), a mycotoxin produced by Fusarium graminearum, on action potentials of cultured cardiomyocytes and the possible protective effects of sodium selenite.</p><p><b>METHODS</b>Ventricular myocytes from neonatal Wistar rats were cultured, and the transmembrane action potentials were recorded with glass microelectrodes before and after addition of DON at different concentrations. The cultured cardiomyocytes were pretreated with 0.5 mg/L selenium (as sodium selenite) to observe the protective effects of selenium against the effects of DON.</p><p><b>RESULTS</b>DON at concentrations of 50, 100 and 200 mg/L decreased the action potential parameters including action potential amplitude (APA), overshoot (OS), threshold potential (TP), maximum rate of depolarization (Vmax) and action potential discharging frequency (APF), and prolonged the action potential duration of 10%, 50% and 90% repolarization (APD(10), APD(50) and APD(90)). Some of the parameters, such as APA, Vmax, APD and APF, changed in a concentration-dependent manner. The cultured cardiomyocytes pretreated with 0.5 mg/L of selenium for about 16 h presented only slight changes in action potential parameters induced by 200 mg/L DON.</p><p><b>CONCLUSIONS</b>DON inhibit the membrane action potentials of cardiomyocytes, suggesting DON may interfere with the transmembrane movement of Ca(2+) and K(+), and sodium selenite may decrease the toxic effect of DON on cultured cardiomyocytes.</p>
Texto completo:
Disponible
Índice:
WPRIM (Pacífico Occidental)
Asunto principal:
Farmacología
/
Fisiología
/
Selenio
/
Tricotecenos
/
Potenciales de Acción
/
Células Cultivadas
/
Ratas Wistar
/
Miocitos Cardíacos
/
Toxicidad
/
Animales Recién Nacidos
Límite:
Animales
Idioma:
Chino
Revista:
Chinese Journal of Preventive Medicine
Año:
2003
Tipo del documento:
Artículo
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