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- W2367584 abstract "Troglitazone (T), an anti-diabetic drug improving insulin resistance, was studied as to its inhibition of copper ion-catalysed oxidation of native, glycated and glycoxidated low-density lipoprotein (LDL). A dose-dependent inhibition was noted in the concentration range 40-160 microg/ml. An almost complete inhibition of oxidation (2-8 h), as monitored by the formation of thiobarbituric acid-reactive substances, was observed for both native and glycated LDL at a concentration of 160 microg/ml T, while the maximal inhibition for glycoxidated LDL amounted only to 60% at this concentration of the drug. This is reflected by differences in the affinity of the drug for the different types of LDL modification: While the binding of T both to native or glycated LDL increased linearly with increasing T concentration and was not saturable in the concentration range tested (0-160 microg/ml), binding of the drug to glycoxidated LDL was already nearly saturated at 10 microg/ml. The nearly complete inhibitory action of T towards oxidation of native and glycated LDL was lost, however, upon increasing the total oxidation time to 24 h. In human umbilical vein endothelial cell-mediated oxidation of LDL, T at a concentration of 20 microg/ml significantly reduced formation of oxidation-dependent fluorescent chromophores and liberation of 8-epi-PGF2alpha. In contrast, generation of thiobarbituric acid-reactive substances was not significantly inhibited. As opposed to copper-mediated LDL-oxidation, different binding of T to LDL-modifications does not govern inhibition of human umbilical vein endothelial cell-mediated LDL-oxidation." @default.
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- W2367584 date "2000-06-01" @default.
- W2367584 modified "2023-09-23" @default.
- W2367584 title "Troglitazone-binding to Ldl and its glycated modifications" @default.
- W2367584 doi "https://doi.org/10.1016/s0024-3205(00)00662-7" @default.
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