Tryptophan as a link between psychopathology and somatic states.

Abstract:

OBJECTIVE:Several somatic illnesses are associated with psychiatric comorbidity. Evidence is provided that availability of the essential amino acid tryptophan, which is the precursor of serotonin, may cause this phenomenon. METHODS:We performed a database search to find relevant articles published between 1966 and 2002. For our search strategy, we combined several diseases from the categories hormonal, gastrointestinal, and inflammatory with the search terms "tryptophan" and "serotonin." RESULTS:The catabolism of tryptophan is stimulated under the influence of stress, hormones and inflammation by the induction of the enzymes tryptophan pyrrolase (in the liver) and IDO (ubiquitous). Because of the reduction in blood levels of tryptophan under these circumstances the formation of cerebral serotonin is decreased. CONCLUSIONS:It is argued that the coupling of peripheral tryptophan levels and cerebral serotonin levels has physiological significance. The clinical implications and therapeutic consequences of changes in tryptophan and consequently serotonin metabolism are discussed.

journal_name

Psychosom Med

journal_title

Psychosomatic medicine

authors

Russo S,Kema IP,Fokkema MR,Boon JC,Willemse PH,de Vries EG,den Boer JA,Korf J

doi

10.1097/01.psy.0000078188.74020.cc

subject

Has Abstract

pub_date

2003-07-01 00:00:00

pages

665-71

issue

4

eissn

0033-3174

issn

1534-7796

journal_volume

65

pub_type

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