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- W2093961716 abstract "1. Tryptophan increases 5HT synthesis, but the extent to which it increases 5HT release and therefore 5HT function is unclear. 2. The possibility that increased 5HT levels will lead to increased 5HT release is enhanced when 5HT neurons are firing at a higher rate. The rate of firing of 5HT neurons is increased as the level of behavioral arousal increases. Thus, altered tryptophan levels will be more likely to influence brain function at higher levels of arousal. 3. In the rat, tryptophan administration increased CSF 5HT appreciably when the animals were aroused by being put in the dark, but not when they were left in a lighted room. 4. In monkeys, the level of behavioral arousal does seem to influence the effect of altered tryptophan levels on aggression. This is consistent with the fact that altered tryptophan levels had no effect on aggression in normal subjects, but that tryptophan had a therapeutic effect in pathologically aggressive patients. 5. The confusing literature on the antidepressant effect of tryptophan can, to some extent, be explained by considering the circumstances in which tryptophan administration will lead to increases in 5HT release as well as increases in 5HT synthesis. 6. Although in some circumstances tryptophan can decrease pain perception by activation of spinal 5HT pathways, when it was given to postoperative patients it attenuated morphine analgesia by activation of a 5HT pathway in the brain. 7. The effect of altered tryptophan levels depend critically on the circumstances in which it is given." @default.
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- W2093961716 date "1989-01-01" @default.
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- W2093961716 title "Tryptophan availability, 5ht synthesis and 5HT function" @default.
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- W2093961716 doi "https://doi.org/10.1016/0278-5846(89)90126-7" @default.
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