Tryptophan metabolism, from nutrition to potential therapeutic applications

Amino Acids - Tập 41 - Trang 1195-1205 - 2010
Nathalie Le Floc’h1,2, Winfried Otten3, Elodie Merlot1,2
1INRA, UMR1079, Système d’Elevage, Nutrition Animale et Humaine (SENAH), Saint Gilles, France
2Agrocampus Ouest, UMR1079 SENAH, Rennes, France
3Research Unit Behavioural Physiology, Leibniz Institute for Farm Animal Biology, Dummerstorf, Germany

Tóm tắt

Tryptophan is an indispensable amino acid that should to be supplied by dietary protein. Apart from its incorporation into body proteins, tryptophan is the precursor for serotonin, an important neuromediator, and for kynurenine, an intermediary metabolite of a complex metabolic pathway ending with niacin, CO2, and kynurenic and xanthurenic acids. Tryptophan metabolism within different tissues is associated with numerous physiological functions. The liver regulates tryptophan homeostasis through degrading tryptophan in excess. Tryptophan degradation into kynurenine by immune cells plays a crucial role in the regulation of immune response during infections, inflammations and pregnancy. Serotonin is synthesized from tryptophan in the gut and also in the brain, where tryptophan availability is known to influence the sensitivity to mood disorders. In the present review, we discuss the major functions of tryptophan and its role in the regulation of growth, mood, behavior and immune responses with regard to the low availability of this amino acid and the competition between tissues and metabolic pathways for tryptophan utilization.

Tài liệu tham khảo

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