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- W2078583984 abstract "One of the mechanisms by which lead may cause a perturbation in the nervous system is the alteration of endothelial cell function. This study investigated the effect of lead acetate on constitutive and cytokine-induced production of nitrite, a marker of nitric oxide, in brain microvascular endothelial cells. Nitric oxide synthase may be a target for lead and changes in its function can result in a cascade of physiological effects seen in vivo. Concentrations of 10, 100, and 1000 nM lead acetate, in the presence or absence of 100 ng lipopolysaccharide/ml, 400 U interferon-gamma/ml and 100 U tumor necrosis factor-alpha/ml, were added to confluent cultures of brain microvascular endothelial cells. Concentrations of lead acetate as low as 10 nM decreased constitutive levels of nitrite by 50% without inhibiting the inducible levels. Addition of 1 microM lead acetate had no effect on [3H]L-leucine incorporation, lactate dehydrogenase release, or cellular morphology, indicating that the effect was selective. Increasing the concentration of extracellular calcium to 2 mM abolished the inhibitory effect of lead acetate on the constitutive production of nitrite. These studies suggest that low concentrations of lead are capable of inhibiting nitrite produced by the calcium-dependent constitutive form of nitric oxide synthase while the calcium-independent, inducible form of nitric oxide synthase is not affected. These data provide another testable hypothesis for the as yet undetermined mechanisms of lead neurotoxicity." @default.
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- W2078583984 date "1994-05-01" @default.
- W2078583984 modified "2023-09-25" @default.
- W2078583984 title "Effect of Lead Acetate on Nitrite Production by Murine Brain Endothelial Cell Cultures" @default.
- W2078583984 doi "https://doi.org/10.1006/taap.1994.1107" @default.
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