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- W1982371349 abstract "Vascular smooth muscle cell (VSMC) dysfunction plays a role in diabetic macrovasculopathy and this may include abnormalities in growth characteristics and the extracellular matrix. As the actual mechanisms by which glucose induces VSMC dysfunction remain unclear, the aim of this study was to assess the potential role of glucose-induced oxidative stress. Porcine aortic VSMCs were cultured for 10 days in either 5 mmol/l normal glucose or 25 mmol/l D-glucose (high glucose). There was evidence of oxidative stress as indicated by a 50% increase in intracellular malondialdehyde (p < 0.05), increased mRNA expression of CuZn superoxide dismutase and Mn superoxide dismutase (by 51% and 37% respectively, p < 0.01) and a 50% decrease in glutathione in 25 mmol/l D-glucose (p < 0.001). Growth was increased by 25.0% (p < 0.01). mRNA expression of extracellular matrix proteins (collagens I, III, IV and fibronectin) was not altered by high glucose in these experimental conditions. Repletion of glutathione with N-acetyl L-cysteine (1 mmol/l) in VSMC grown in high glucose was associated with reduction in malondialdehyde and restored growth to that of normal glucose. The water soluble analogue of vitamin E, Trolox (200 mumol/l), reduced malondialdehyde concentrations, but had no effect on glutathione depletion or the increased growth rate seen with high glucose. The addition of buthionine sulphoximine (10 mumol/l) to VSMC cultured in normal glucose reduced glutathione, increased malondialdehyde and increased growth to a similar extent as that found in high glucose alone. These results suggest that thiol status, rather than lipid peroxides, is a key factor in modulating VSMC growth and that mRNA expression of extracellular matrix proteins is not increased in VSMC under conditions of glucose-induced oxidative stress." @default.
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- W1982371349 date "1998-09-18" @default.
- W1982371349 modified "2023-09-27" @default.
- W1982371349 title "The effects of glucose-induced oxidative stress on growth and extracellular matrix gene expression of vascular smooth muscle cells" @default.
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- W1982371349 doi "https://doi.org/10.1007/s001250051054" @default.
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