Resumo

FIGUEROA-VALVERDE, Lauro et al. Effects of danazol and danazol hemisuccinate on perfusión pressure and vascular resistance. Acta bioquím. clín. latinoam. [online]. 2010, vol.44, n.1, pp.37-46. ISSN 0325-2957.

Epidemiological and clinical studies suggest that danazol has been considered a risk factor for hypertension development. In order to provide additional information about this phenomenon, the effect induced by both danazol and hemisuccinate of danazol on perfusion pressure and vascular resistance was characterized in isolated rat heart at constant flow (Langendorff model) and it was evaluated in this work.The results showed that; 1) hemisuccinate of danazol [10^-9 M] increases perfusion pressure and vascular resistance in comparison with danazol [10^-9 M]; 2) the effects of danazol-derivative [10^{-9 M - 10-4} M] on perfusion pressure were inhibited by flutamide [10^-6 M]; 3) nifedipine [10^-6 M] blockaded the effects exerted by hemisuccinate of danazol [10^{-9 M -10-4} M] on perfusion pressure; and 4) the effect of danazol-derivative [10^{-9 M - 10-4} M] on perfusion pressure in presence of montelukast [10^-6 M] was significantly inhibited (p=0.008). In conclusion, the effects induced by both danazol and hemisuccinate of danazol on perfusion pressure and vascular resistance could depend on their chemical structure. This phenomenon could involve the interaction of androgene steroid-receptor and indirect activation of leukotriene D4 (LTD4) synthesis and consequently, induce variations in the perfusion pressure.

Palavras-chave : Danazol; Langendorff model; Perfusion pressure.

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