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.
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.
Authors: S J Bull; P Huezo-Diaz; E B Binder; J F Cubells; G Ranjith; C Maddock; C Miyazaki; N Alexander; M Hotopf; A J Cleare; S Norris; E Cassidy; K J Aitchison; A H Miller; C M Pariante Journal: Mol Psychiatry Date: 2008-05-06 Impact factor: 15.992
Authors: Fokko J Bosker; Ben H C Westerink; Thomas I F H Cremers; Marjolein Gerrits; Marieke G C van der Hart; Sjoukje D Kuipers; Gieta van der Pompe; Gert J ter Horst; Johan A den Boer; Jakob Korf Journal: CNS Drugs Date: 2004 Impact factor: 5.749
Authors: Isadora C Botwinick; Lisa Pursell; Gary Yu; Tom Cooper; J John Mann; John A Chabot Journal: HPB (Oxford) Date: 2014-01-28 Impact factor: 3.647