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The interaction of some kynurenine pathway metabolites with 5-hydroxytryptophan and 5-hydroxytryptamine

✍ Scribed by Sheila L. Handley; Ruth C. Miskin

Publisher
Springer
Year
1977
Tongue
English
Weight
411 KB
Volume
51
Category
Article
ISSN
0033-3158

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✦ Synopsis

The kynurenine pathway metabolites kynurenine, 3-hydroxykynurenine and xanthurenic acid have been tested against 5-hydroxytryptamine (5-HT) and 5-hydroxytryptophan (5-HTP)-induced head twitches in the mouse in a dose-range of 0.5-5.0 mg/ kg. Kynurenine and 3-hydroxykynurenine were highly active. Low doses caused marked potentiation of the twitch response to both 5-HT and 5-HTP with increased toxicity of 5-HT. High doses caused antagonism of both responses. Xanthurenic acid was inactive over the same dose range. The effects of kynurenine could not be duplicated in the guinea-pig ileum. The relevance of these results to the involvement of kynurenine pathway metabolites in depressive illness is discussed.

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The effects of 5-hydroxytryptamine and 5-hydroxytryptophan on insulin release and 45Ca2+ uptake in islets microdissected from ob/ob mice were studied. At a concentration of 4 mmol/l both compounds slightly stimulated insulin release at a low glucose concentration (3 mmol/l). Insulin release induced