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“The data indicate that during l-tryptophan treatment, plasma probenecid concentrations are reduced but that no significant alterations in cerebrospinal fluid probenecid concentrations occur.”
“ Probenecid caused an increase by 52% (P<0.01) in the free (non protein-bound) concentration of tryptophan in plasma (from 1.22±0.16 to 1.86±0,28 Μg/ml; mean±SEM).”
“In this study an attempt was made to establish whether probenecid also exerts an influence on the metabolism of the MA precursors: tryptophan and tyrosine.”
“Preloading animals with both tryptophan and probenecid increased the apparent transport of lactate, probenecid and 5HIAA but not the transport of glucose.”
“On the other hand, it is concluded that probenecid is able to inhibit the excretion from the brain of some acid compounds including tyrosine, tryptophan and DOPA.”
Comparative biochemistry and physiology. C, Comparative pharmacology and toxicology • 1984 | View Paper
“ Brain tryptophan concentration was also markedly increased by phenmetrazine, phenelzine, dl -fenfluramine, bulbocapnine, γ-hydroxybutyrate and probenecid.”