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The underlying mechanisms of hemoglobin (Hb)-induced vasoconstriction are not yet well understood. The aim of this study was to elucidate the influence of nitric oxide (NO) and endothelin (ET) on Hb-induced pulmonary vasoconstriction. Therefore, an autologous Hb preparation was administered into isolated rabbit lungs, in which pulmonary artery pressure (PAP) and weight gain was monitored. Either glyceroltrinitrate (GTN; 10(-5) M; n=6), L-arginine (10(-2) M; n=6), L-NAME (10(-4)M; n=6), ET(A)- or ET(B)-receptor antagonists (BQ,23, 10 6M, n=6) or (BQ788, 10(-6) M, n=6) were added to the perfusion fluid and NOx and thromboxane A2 levels were measured.

ROLE OF NO AND ENDOTHELIN IN HEMOGLOBIN-INDUCED PULMONARY VASOCONSTRICTION