Abstract
After complete hepatectomy in rats, there was a profound depletion of norepinephrine throughout the brain, whereas dopamine concentrations remained within the normal range. This suggests that in liver failure there is inhibition of norepinephrine synthesis at one of two processes subsequent to the formation of dopamine--that is, either the uptake of dopamine by vesicles or the hydroxylation of dopamine may be inhibited. However, other factors could contribute to the depletion of norepinephrine, including degeneration of its specific storage sites, displacement by false neurotransmitters, or an increased rate of catabolism. The present experiments do not allow a selection among these possibilities.
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