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• W3195898165 abstract "In the present study, we tested the hypothesis that multiple risk factors, including diabetes mellitus (DM), dyslipidaemia and chronic kidney disease (CKD) result in a loss of nitric oxide (NO) signalling, thereby contributing to coronary microvascular dysfunction. Risk factors were induced in 12 female swine by intravenous streptozotocin injections (DM), a high fat diet (HFD) and renal artery embolization (CKD). Female healthy swine (n = 13) on normal diet served as controls (Normal). After 5 months, swine were chronically instrumented and studied at rest and during exercise. DM + HFD + CKD swine demonstrated significant hyperglycaemia, dyslipidaemia and impaired kidney function compared to Normal swine. These risk factors were accompanied by coronary microvascular endothelial dysfunction both in vivo and in isolated small arteries, due to a reduced NO bioavailability, associated with perturbations in myocardial oxygen balance at rest and during exercise. NO synthase inhibition caused coronary microvascular constriction in exercising Normal swine, but had no effect in DM + HFD + CKD animals, while inhibition of phosphodiesterase 5 produced similar vasodilator responses in both groups, indicating that loss of NO bioavailability was principally responsible for the observed coronary microvascular dysfunction. This was associated with an increase in myocardial 8-isoprostane levels and a decrease in antioxidant capacity, while antioxidants restored the vasodilation to bradykinin in isolated coronary small arteries, suggesting that oxidative stress was principally responsible for the reduced NO bioavailability. In conclusion, five months of combined exposure to DM + HFD + CKD produces coronary endothelial dysfunction due to impaired NO bioavailability, resulting in impaired myocardial perfusion at rest and during exercise." @default.
• W3195898165 created "2021-08-30" @default.
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• W3195898165 date "2021-08-26" @default.
• W3195898165 modified "2023-09-26" @default.
• W3195898165 title "Reduced nitric oxide bioavailability impairs myocardial oxygen balance during exercise in swine with multiple risk factors" @default.
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• W3195898165 doi "https://doi.org/10.1007/s00395-021-00890-8" @default.
• W3195898165 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/8387273" @default.
• W3195898165 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/34435256" @default.
• W3195898165 hasPublicationYear "2021" @default.
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