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- W1998585557 abstract "The precise mechanisms involved in the etiology of cardiovascular complications in diabetes are undefined. Recent evidence suggests that the renin-angiotensin system plays a predominant role in the genesis of these complications. The temporal evolution of vascular angiotensin-converting enzyme (ACE) activity was evaluated in streptozotocin-diabetic rats 2 and 4 weeks following the induction of diabetes. Vascular ACE activity was correlated with acetylcholine-induced relaxation, systolic blood pressure, and cardiac output index, establishing a possible link between these variables. Age-matched Sprague-Dawley rats were used as controls. ACE activity in aortic homogenates doubled in rats after 2 weeks of diabetes as compared with controls (0.46 +/- 0.06 vs. 0.19 +/- 0.02 nmol/mg x min, n = 8, p < 0.05). In contrast, no difference was observed between rats 4 weeks following diabetes onset (0.20 +/- 0.05 nmol/mg x min) and controls (n = 8, p > 0.05). Impaired endothelial function was also observed in the aorta of diabetic animals. The maximal aortic relaxation with 10 micromol/l acetylcholine was reduced by 40% in diabetic rats 2 weeks after onset and by 41% after 4 weeks when compared to controls (n = 8, p < 0.05). Two weeks following diabetes induction, the cardiac output index decreased by 16% and after 4 weeks by 30% (n = 4, p < 0.05). Systolic blood pressure increased from 116 +/- 12 mm Hg before diabetes to 158 +/- 4 mm Hg (p < 0.05) after 2 weeks and to 182 +/- 5 mm Hg after 4 weeks (p < 0.05). Together, these results suggest that a local renin-angiotensin system plays an important role in the genesis of vascular dysfunction and cardiac deterioration within the first stages of diabetes. A high vascular ACE activity may promote progressive deterioration of the cardiovascular system in streptozotocin-diabetic rats from the earliest stages by increasing peripheral resistance, blood pressure, preload, afterload, and cardiac work." @default.
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- W1998585557 date "2003-01-01" @default.
- W1998585557 modified "2023-10-13" @default.
- W1998585557 title "Cardiovascular Deterioration in STZ-Diabetic Rats: Possible Role of Vascular RAS" @default.
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- W1998585557 doi "https://doi.org/10.1159/000068725" @default.
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