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• W2085141749 abstract "The effects of 3 months streptozotocin-induced diabetes mellitus on contraction and relaxation of aorta were examined in vitro. A further diabetic group was treated with a novel sulphonylnitromethane-based aldose reductase inhibitor for 3 months following diabetes induction. Diabetes resulted in reduced maximal tension production, particularly for responses to phenylephrine (p < 0.001) and serotonin (p < 0.001). However, with aldose reductase inhibitor treatment, responses were in the non-diabetic range. The ratio of maximum contractions to noradrenaline and phenylephrine were 28% elevated by diabetes (p < 0.01), which may suggest increased alpha 2-adrenoreceptor-mediated responses. Endothelium-independent relaxation to glyceryl trinitrate was unaffected by diabetes or treatment. By contrast, there were 38% deficits in endothelium-dependent relaxation to acetylcholine (p < 0.001) and Ca2+ ionophore A23187 (p < 0.001) with diabetes which were prevented by aldose reductase inhibitor treatment (p < 0.001). A 121% shift in the concentration giving a 50% maximum effect for acetylcholine towards lower sensitivity with diabetes (p < 0.001) was also largely corrected by treatment (p < 0.001). A non-diabetic group treated with aldose reductase inhibitor showed a 30% decrease in the 50% effective concentration for acetylcholine (p < 0.05). A 15% deficit in maximum relaxation to the ATP-sensitive K+ channel opener cromakalim for the diabetic group (p < 0.001) was prevented by aldose reductase inhibitor treatment (p < 0.01). We conclude that there are polyol pathway related abnormalities for contraction, some aspects of endothelium-independent relaxation, but particularly for endothelium-dependent relaxation in aorta from chronic streptozotocin-diabetic rats.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
• W2085141749 created "2016-06-24" @default.
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• W2085141749 date "1992-11-01" @default.
• W2085141749 modified "2023-09-27" @default.
• W2085141749 title "Impaired contraction and relaxation in aorta from streptozotocin-diabetic rats: Role of polyol pathway" @default.
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• W2085141749 doi "https://doi.org/10.1007/bf02221675" @default.
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