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- W2127851750 abstract "The metabolic syndrome is associated with activation of the renin-angiotensin system. However, whether the coronary vascular response to ANG II is altered under this condition is unknown. Experiments were conducted in control and chronically high-fat-fed dogs with the prediabetic metabolic syndrome both in vitro (isolated coronary arterioles, 60–110 μm) and in vivo (anesthetized and conscious). We found that plasma renin activity and ANG II levels are elevated in high-fat-fed dogs and that this increase in ANG II is associated with a significant increase in ANG II-mediated coronary vasoconstriction in isolated coronary arterioles and in anesthetized open-chest dogs. The vasoconstriction to ANG II is abolished by ANG II type 1 (AT 1 ) receptor blockade. In conscious chronically instrumented dogs, AT 1 receptor blockade with telmisartan improved the balance between coronary blood flow and myocardial oxygen consumption in the high-fat-fed dogs but not in normal control dogs, i.e., the relationship between coronary venous Po 2 and myocardial oxygen consumption was shifted upward, toward normal control values. Quantitative assessment of coronary arteriolar AT 1 and ANG II type 2 (AT 2 ) receptor mRNA levels by real-time PCR revealed no significant difference between normal control and high-fat-fed dogs; however, Western blot analysis showed a significant increase in AT 1 receptor protein level with no change in AT 2 receptor protein density. These findings indicate that AT 1 receptor-mediated coronary constriction is augmented in the prediabetic metabolic syndrome and contributes to impaired control of coronary blood flow via increases in circulating ANG II and/or coronary arteriolar AT 1 receptor density." @default.
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- W2127851750 date "2005-05-01" @default.
- W2127851750 modified "2023-10-15" @default.
- W2127851750 title "Coronary arteriolar vasoconstriction to angiotensin II is augmented in prediabetic metabolic syndrome via activation of AT<sub>1</sub> receptors" @default.
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- W2127851750 doi "https://doi.org/10.1152/ajpheart.00987.2004" @default.
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