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• W2045794043 abstract "Reactive oxygen species (ROS) participate in the intracellular signalling of angiotensin II. However, the mechanisms of the interaction of ROS with hypertension and mitogen-activated protein kinase (MAPK) in vivo have remained unclear. Angiotensin II infusion provokes sustained hypertension accompanied with enhancement of ROS production; initially hypertension is non-sensitive to ROS, but thereafter becomes sensitive. We examined the time-dependent transition of ROS-sensitive vasoconstriction during angiotensin II infusion and also ROS sensitivity to cardiovascular MAPK activation in acutely and chronically angiotensin II-infused rats.During infusion of a pressor dose of angiotensin II to conscious Sprague-Dawley rats, tempol, a superoxide dismutase mimetic, was administered at 10 min, some 1, 3, 6, 12 and 24 h after the start of infusion. The magnitude of the reduction in blood pressure by tempol was initially negligible, but gradually enlarged, and reached a maximum of 96% of delta increase by angiotensin II at 12 h. However, even after sensitization to tempol, superimposed angiotensin II enabled an increase of blood pressure under tempol treatment. In chronically angiotensin II-infused rats, superimposed angiotensin II exhibited tempol quenchable MAPK activation.These results indicate that the mechanisms of angiotensin II-induced vasoconstriction may shift from being non-sensitive to ROS to sensitive within 12 h; nevertheless, both ROS non-sensitive vasoconstriction and ROS-sensitive MAPK activation by angiotensin II, which are both seen in the acute phase of infusion, are restored in the late maintaining phase of prolonged angiotensin II infusion." @default.
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• W2045794043 date "2004-11-01" @default.
• W2045794043 modified "2023-10-14" @default.
• W2045794043 title "Time-dependent transition of tempol-sensitive reduction of blood pressure in angiotensin II-induced hypertension" @default.
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• W2045794043 doi "https://doi.org/10.1097/00004872-200411000-00019" @default.
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