Resumo

FIGUEROA VALVERDE, Lauro et al. Inotropic effect exerted by the brucine derivativein an isolated rat heart mode. Acta bioquím. clín. latinoam. [online]. 2014, vol.48, n.2, pp.203-211. ISSN 0325-2957.

Few data exist with respect to the effects of brucine and its derivatives at a cardiovascular level; furthermore, the molecular mechanism and its site of cellular action are still unclear. In order to provide additional information about this phenomenon, the effect induced by a brucine derivative on perfusion pressure, vascular resistance and left ventricular pressure was evaluated in anisolated rat heart at constant flow (Langendorff model). The results showed that: 1) The brucine derivative [1×10-9 mM] increased perfusion pressure and vascular resistance in comparison with the brucine [1×10-9 mM] and the control conditions; 2) the effects of brucine derivative [1×10-9 to 1×10-4 mM] on intraventricular pressure were not inhibited by metoprolol, prazosin or nifedipine at a 1×10-6 mM dose; 3) furosemide [1×10-6 mM] blocked the effects exerted by the brucine derivative [1×10-9 a 1×10-4 mM] on intraventricular pressure. In conclusion, the activity exerted by the brucine derivative on perfusion pressure, vascular resistance and left ventricular pressure, involves inhibition of Na+/K+-ATPase, consequently resulting in indirect changes in intracellular calcium levels and subsequently inducing a positive inotropic effect.

Palavras-chave : Brucine; Furosemide; Ventricular pressure; Heart; Nifedipine.

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