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Endotoxic shock is a systemic inflammatory response that is associated with an increase in nitric oxide production and a decrease in the formation of 20-hydroxyeicosatetraenoic acid (20-HETE), which may contribute to the fall in blood pressure and vascular reactivity. The present study examined the effects of a synthetic analogue of 20-HETE, N-[20-hydroxyeicosa-5(Z),14(Z)-dienoyl]glycine (5,14-HEDGE), on the fall in blood pressure and vascular responsiveness to vasoscontrictors and acetylcholine in rats treated with endotoxin. The MAP fell by 31 mmHg, and the heart rate rose by 90 beats/min in male Wistar rats treated with endotoxin (10 mg/kg, intraperitoneally). The fall in MAP was associated with a decrease in the vasoconstrictor response to norepinephrine in isolated aorta and superior mesenteric artery and increased levels of nitrite in the serum, kidney, heart, and vascular tissues. The effects of endotoxin were prevented by 5,14-HEDGE (30 mg/kg, s.c.) given 1 h after injection of endotoxin. Furthermore, a competitive antagonist of vasoconstrictor effects of 20-HETE, 20-hydroxyeicosa-6(Z),15(Z)-dienoic acid (30 mg/kg, s.c.), prevented the beneficial effects of 5,14-HEDGE on MAP and vascular tone in rats treated with endotoxin. These data are consistent with the view that a fall in the production of 20-HETE contributes to the fall in MAP and vascular reactivity in rats treated with endotoxin, and that 5,14-HEDGE has a beneficial effect.

shock

A 20-HYDROXYEICOSATETRAENOIC ACID AGONIST, N-[20-HYDROXYEICOSA-5(Z),14(Z)-DIENOYL]GLYCINE, OPPOSES THE FALL IN BLOOD PRESSURE AND VASCULAR REACTIVITY IN ENDOTOXIN-TREATED RATS