Abstract
We investigated the utility of deaminated norepinephrine (NE) metabolites in the study of human sympathetic nervous pathophysiology. Plasma levels of the NE metabolite dihydroxyphenylglycol (DHPG) appear to be related to intraneuronal NE stores. Plasma DHPG increases when sympathetic nervous activity or circulating NE increase and decreases when neuronal NE is depleted or neuronal NE reuptake is blocked. Changes in plasma dihydroxymandelic acid (DOMA) related less closely to changes in plasma NE. The coupling of measurements of plasma NE with its deaminated metabolites and DHPG may improve understanding of human NE metabolism and neuronal NE reuptake.
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