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• W2029996930 abstract "Hypothyroidism impairs endothelium-dependent dilatations, while hyperthyroidism augments the production of endothelial nitric oxide. Thus, experiments were designed to determine if thyroid hormone causes endothelium-dependent responses, or alleviates diabetic endothelial dysfunction. Isometric tension was measured in rings with or without endothelium of arteries from normal and diabetic Sprague-Dawley rats. Release of 6-keto prostaglandin F1α and thromboxane B2 were measured by enzyme linked immunosorbent assay and protein levels [endothelial nitric oxide synthase (eNOS), cyclooxygenases (COX)] by immunoblotting. Triiodothyronine (T3) caused concentration-dependent (3×10(-6)-3×10(-5)M) relaxations in mesenteric (pEC50, 4.96±0.19) and femoral (pEC50, 4.57±0.35) arteries without endothelium. In femoral arteries of rats with diabetes, 5-methylamino-2-[[(2S,3R,5R,8S,9S)-3,5,9-trimethyl-2-(1-oxo-(1H-pyrrol-2- -yl)propan-2-yl)-1,7-dioxaspiro-(5,5)undecan-8-yl]methyl]benzooxazole-4-carboxylic acid (A23187, 3×10(-7) to 10(-6)M) caused partly endothelium-dependent contractions. After chronic T3-treatment with (10μg/kg/day; four weeks), the contractions to A23187 of preparations with and without endothelium were comparable, the thromboxane B2-release was reduced (by 38.1±9.2%). The pEC50 of 9, 11-dideoxy-11α, 9α-epoxymethanoprostaglandin F2α (U46619, TP-receptor agonist) was increased in T3-treated diabetic rats compared with controls (8.53±0.06 vs 7.94±0.09). The protein expression of eNOS increased (by 228%) but that of COX-1 decreased (by 35%) after chronic T3 treatment. In human umbilical vein endothelial cells incubated for one week with T3 (10(-10)-10(-7)M) in the presence but not in the absence of interleukin-1β (1ng/ml), the expression of eNOS was increased compared to control. In conclusion, thyroid hormone acutely relaxes mesenteric and femoral vascular smooth muscle, but given chronically reduces the release of endothelium-derived vasoconstrictor prostanoids while enhancing the responsiveness of TP receptors of vascular smooth muscle." @default.
• W2029996930 created "2016-06-24" @default.
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• W2029996930 date "2015-01-01" @default.
• W2029996930 modified "2023-10-14" @default.
• W2029996930 title "Thyroid hormone affects both endothelial and vascular smooth muscle cells in rat arteries" @default.
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• W2029996930 doi "https://doi.org/10.1016/j.ejphar.2014.11.036" @default.
• W2029996930 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25489922" @default.
• W2029996930 hasPublicationYear "2015" @default.
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