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Liver cells pre-incubated with 1 mM-DL-6-chlorotryptophan are less sensitive to tryptophan-mediated inhibition of gluconeogenesis; this effect is apparent both at physiological (0.1 mM) and higher (0.5 mM) concentrations of tryptophan. 4-Chloro-3-hydroxyanthranilate (1-100 microM) has effects similar to those of DL-6-chlorotryptophan. The effects of both compounds are consistent with a decrease in quinolinate formation, a consequence of inhibition of 3-hydroxyanthranilate oxidase. Pyrazinamide (0.25-5.0 mM) significantly decreased flux through the glutarate pathway and potentiated tryptophan-mediated inhibition of gluconeogenesis; these changes were apparent at physiological concentrations of tryptophan. The effects of pyrazinamide are consistent with an increase in quinolinate formation resulting from inhibition of picolinate carboxylase.

Tryptophan and glucose metabolism in rat liver cells. The effects of dl-6-chlorotryptophan, 4-chloro-3-hydroxyanthranilate and pyrazinamide