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- W2164134406 abstract "Objective— We hypothesize that controversial effects of angiotensin II (Ang II) are attributable to its regulation of reactive oxygen species (ROS) and ROS-dependent signaling. Methods and Results— Coronary collateral growth (CCG) was stimulated in normal (WKY) and syndrome X (JCR) rats by transient/repetitive ischemia (RI). Blood flow was measured in the normal (NZ) and the collateral-dependent (CZ) zone. In WKY, RI increased CZ flow (0.84 mL/min/g), but RI+subpressor Ang II increased it more (1.24 mL/min/g). This was associated with transient p38 and sustained Akt activation. A hypertensive dose of Ang II decreased CZ flow (0.69 mL/min/g), which was associated with sustained p38 and transient Akt activation. AT1R blockade by candesartan abrogated CZ flow in WKY (0.58 mL/min/g), reduced myocardial superoxide, and blocked p38 and Akt activation. RI-induced CZ flow in JCR was significantly decreased compared with WKY (0.12 mL/min/g), associated with a large increase in superoxide and lack of p38 and Akt activation. CZ flow in JCR was partially restored by candesartan (0.45 mL/min/g), accompanied by reduction in superoxide and partial restoration of p38 and Akt activation. Conclusion— Ang II/AT1R blockade, at least in part, regulates CCG via generating optimal ROS amounts and activating redox-sensitive signaling." @default.
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- W2164134406 date "2008-01-01" @default.
- W2164134406 modified "2023-10-15" @default.
- W2164134406 title "The Mechanistic Basis for the Disparate Effects of Angiotensin II on Coronary Collateral Growth" @default.
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- W2164134406 doi "https://doi.org/10.1161/atvbaha.107.154294" @default.
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