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- W2022068135 abstract "The mechanisms leading to the age-related loss of endothelial nitric oxide (NO) and NO-dependent vasodilation remain largely unknown. Freshly isolated endothelium from young (6 months) and old (36 months) F344 × BrN rats were analyzed for endothelial nitric oxide synthase (eNOS) protein, its subcellular distribution, and association with regulatory proteins. Results show that both vessel ring vasoreactivity and A23187-induced eNOS activity in isolated endothelial cells significantly (p ⩽ 0.05) declined with age. Levels of cGMP, a reliable marker for NO bioactivity also declined significantly (p ⩽ 0.01). However, no change in overall eNOS protein was evident. Subcellular fractionation studies revealed an age-related loss in active, plasma membrane-bound eNOS relative to eNOS in the Golgi/cytosol of the endothelium. Plasma membrane-associated eNOS in aged endothelium was also less complexed with the activating proteins Hsp90 and Akt and more associated with to caveolin-1, which inhibits eNOS activity. These results suggest that age-dependent loss of NO may be partly caused by differences in eNOS subcellular distribution and its association with inhibitory proteins." @default.
- W2022068135 created "2016-06-24" @default.
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- W2022068135 date "2006-10-01" @default.
- W2022068135 modified "2023-10-14" @default.
- W2022068135 title "Plasma membrane-associated endothelial nitric oxide synthase and activity in aging rat aortic vascular endothelia markedly decline with age" @default.
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- W2022068135 doi "https://doi.org/10.1016/j.abb.2006.02.017" @default.
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