Chronic Low-Grade Inflammation in Elderly Persons Is Associated with Altered Tryptophan and Tyrosine Metabolism: Role in Neuropsychiatric Symptoms

Neuropsychiatric symptoms are common complaints of elderly persons. Recent data suggest that chronic low-grade inflammation, a fundamental characteristic of aging, plays a role. Effects might rely on the influence of inflammation on the activity of two enzymatic pathways, the indoleamine-2,3-dioxyge...

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Published inBiological psychiatry (1969) Vol. 70; no. 2; pp. 175 - 182
Main Authors Capuron, Lucile, Schroecksnadel, Sebastian, Féart, Catherine, Aubert, Agnès, Higueret, Denise, Barberger-Gateau, Pascale, Layé, Sophie, Fuchs, Dietmar
Format Journal Article
LanguageEnglish
Published New York, NY Elsevier Inc 15.07.2011
Elsevier
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Abstract Neuropsychiatric symptoms are common complaints of elderly persons. Recent data suggest that chronic low-grade inflammation, a fundamental characteristic of aging, plays a role. Effects might rely on the influence of inflammation on the activity of two enzymatic pathways, the indoleamine-2,3-dioxygenase (IDO) and the guanosine-triphosphate-cyclohydrolase-1 (GTP-CH1) pathways, which are involved in the biosynthesis of monoamines. The present study assessed this possibility in 284 healthy elderly subjects drawn from the Three-City cohort. Assays included the measurement of serum interleukin-6 and C-reactive-protein, as inflammatory markers; tryptophan, kynurenine, and their ratio as index of IDO activity; and neopterin, phenylalanine, tyrosine, and nitrite, as markers of GTP-CH1 activity. In addition, structured assessments of depressive symptomatology, fatigue, and general behavioral/neurovegetative symptoms were performed. As expected, age correlated significantly with concentrations of immune markers and neuropsychiatric symptoms. Increased inflammation was related to reduced tryptophan concentrations and increased kynurenine levels, suggestive of IDO-induced increased tryptophan catabolism. In addition, inflammation was associated with increases in neopterin and nitrite levels and in phenylalanine concentrations at the expense of tyrosine. Interestingly, increased tryptophan catabolism was associated with the depressive symptoms of lassitude, reduced motivation, anorexia, and pessimism. In contrast, variations in markers of GTP-CH1 activity correlated more with neurovegetative symptoms, including sleep disturbance, digestive symptoms, fatigue, sickness, and motor symptoms. These findings show that chronic low-grade inflammation in aging is associated with alterations in enzymatic pathways involved in monoamine metabolism and suggest that these alterations might participate in the pathophysiology of neuropsychiatric symptoms in elderly persons.
AbstractList *BACKGROUND : Neuropsychiatric symptoms are common complaints of elderly persons. Recent data suggest that chronic low-grade inflammation, a fundamental characteristic of aging, plays a role. Effects might rely on the influence of inflammation on the activity of two enzymatic pathways, the indoleamine-2,3-dioxygenase (IDO) and the guanosine-triphosphate-cyclohydrolase-1 (GTP-CH1) pathways, which are involved in the biosynthesis of monoamines. The present study assessed this possibility in 284 healthy elderly subjects drawn from the Three-City cohort. *METHODS : Assays included the measurement of serum interleukin-6 and C-reactive-protein, as inflammatory markers; tryptophan, kynurenine, and their ratio as index of IDO activity; and neopterin, phenylalanine, tyrosine, and nitrite, as markers of GTP-CH1 activity. In addition, structured assessments of depressive symptomatology, fatigue, and general behavioral/neurovegetative symptoms were performed. *RESULTS : As expected, age correlated significantly with concentrations of immune markers and neuropsychiatric symptoms. Increased inflammation was related to reduced tryptophan concentrations and increased kynurenine levels, suggestive of IDO-induced increased tryptophan catabolism. In addition, inflammation was associated with increases in neopterin and nitrite levels and in phenylalanine concentrations at the expense of tyrosine. Interestingly, increased tryptophan catabolism was associated with the depressive symptoms of lassitude, reduced motivation, anorexia, and pessimism. In contrast, variations in markers of GTP-CH1 activity correlated more with neurovegetative symptoms, including sleep disturbance, digestive symptoms, fatigue, sickness, and motor symptoms. *CONCLUSIONS : These findings show that chronic low-grade inflammation in aging is associated with alterations in enzymatic pathways involved in monoamine metabolism and suggest that these alterations might participate in the pathophysiology of neuropsychiatric symptoms in elderly persons.
Neuropsychiatric symptoms are common complaints of elderly persons. Recent data suggest that chronic low-grade inflammation, a fundamental characteristic of aging, plays a role. Effects might rely on the influence of inflammation on the activity of two enzymatic pathways, the indoleamine-2,3-dioxygenase (IDO) and the guanosine-triphosphate-cyclohydrolase-1 (GTP-CH1) pathways, which are involved in the biosynthesis of monoamines. The present study assessed this possibility in 284 healthy elderly subjects drawn from the Three-City cohort.BACKGROUNDNeuropsychiatric symptoms are common complaints of elderly persons. Recent data suggest that chronic low-grade inflammation, a fundamental characteristic of aging, plays a role. Effects might rely on the influence of inflammation on the activity of two enzymatic pathways, the indoleamine-2,3-dioxygenase (IDO) and the guanosine-triphosphate-cyclohydrolase-1 (GTP-CH1) pathways, which are involved in the biosynthesis of monoamines. The present study assessed this possibility in 284 healthy elderly subjects drawn from the Three-City cohort.Assays included the measurement of serum interleukin-6 and C-reactive-protein, as inflammatory markers; tryptophan, kynurenine, and their ratio as index of IDO activity; and neopterin, phenylalanine, tyrosine, and nitrite, as markers of GTP-CH1 activity. In addition, structured assessments of depressive symptomatology, fatigue, and general behavioral/neurovegetative symptoms were performed.METHODSAssays included the measurement of serum interleukin-6 and C-reactive-protein, as inflammatory markers; tryptophan, kynurenine, and their ratio as index of IDO activity; and neopterin, phenylalanine, tyrosine, and nitrite, as markers of GTP-CH1 activity. In addition, structured assessments of depressive symptomatology, fatigue, and general behavioral/neurovegetative symptoms were performed.As expected, age correlated significantly with concentrations of immune markers and neuropsychiatric symptoms. Increased inflammation was related to reduced tryptophan concentrations and increased kynurenine levels, suggestive of IDO-induced increased tryptophan catabolism. In addition, inflammation was associated with increases in neopterin and nitrite levels and in phenylalanine concentrations at the expense of tyrosine. Interestingly, increased tryptophan catabolism was associated with the depressive symptoms of lassitude, reduced motivation, anorexia, and pessimism. In contrast, variations in markers of GTP-CH1 activity correlated more with neurovegetative symptoms, including sleep disturbance, digestive symptoms, fatigue, sickness, and motor symptoms.RESULTSAs expected, age correlated significantly with concentrations of immune markers and neuropsychiatric symptoms. Increased inflammation was related to reduced tryptophan concentrations and increased kynurenine levels, suggestive of IDO-induced increased tryptophan catabolism. In addition, inflammation was associated with increases in neopterin and nitrite levels and in phenylalanine concentrations at the expense of tyrosine. Interestingly, increased tryptophan catabolism was associated with the depressive symptoms of lassitude, reduced motivation, anorexia, and pessimism. In contrast, variations in markers of GTP-CH1 activity correlated more with neurovegetative symptoms, including sleep disturbance, digestive symptoms, fatigue, sickness, and motor symptoms.These findings show that chronic low-grade inflammation in aging is associated with alterations in enzymatic pathways involved in monoamine metabolism and suggest that these alterations might participate in the pathophysiology of neuropsychiatric symptoms in elderly persons.CONCLUSIONSThese findings show that chronic low-grade inflammation in aging is associated with alterations in enzymatic pathways involved in monoamine metabolism and suggest that these alterations might participate in the pathophysiology of neuropsychiatric symptoms in elderly persons.
Neuropsychiatric symptoms are common complaints of elderly persons. Recent data suggest that chronic low-grade inflammation, a fundamental characteristic of aging, plays a role. Effects might rely on the influence of inflammation on the activity of two enzymatic pathways, the indoleamine-2,3-dioxygenase (IDO) and the guanosine-triphosphate-cyclohydrolase-1 (GTP-CH1) pathways, which are involved in the biosynthesis of monoamines. The present study assessed this possibility in 284 healthy elderly subjects drawn from the Three-City cohort. Assays included the measurement of serum interleukin-6 and C-reactive-protein, as inflammatory markers; tryptophan, kynurenine, and their ratio as index of IDO activity; and neopterin, phenylalanine, tyrosine, and nitrite, as markers of GTP-CH1 activity. In addition, structured assessments of depressive symptomatology, fatigue, and general behavioral/neurovegetative symptoms were performed. As expected, age correlated significantly with concentrations of immune markers and neuropsychiatric symptoms. Increased inflammation was related to reduced tryptophan concentrations and increased kynurenine levels, suggestive of IDO-induced increased tryptophan catabolism. In addition, inflammation was associated with increases in neopterin and nitrite levels and in phenylalanine concentrations at the expense of tyrosine. Interestingly, increased tryptophan catabolism was associated with the depressive symptoms of lassitude, reduced motivation, anorexia, and pessimism. In contrast, variations in markers of GTP-CH1 activity correlated more with neurovegetative symptoms, including sleep disturbance, digestive symptoms, fatigue, sickness, and motor symptoms. These findings show that chronic low-grade inflammation in aging is associated with alterations in enzymatic pathways involved in monoamine metabolism and suggest that these alterations might participate in the pathophysiology of neuropsychiatric symptoms in elderly persons.
Background Neuropsychiatric symptoms are common complaints of elderly persons. Recent data suggest that chronic low-grade inflammation, a fundamental characteristic of aging, plays a role. Effects might rely on the influence of inflammation on the activity of two enzymatic pathways, the indoleamine-2,3-dioxygenase (IDO) and the guanosine-triphosphate-cyclohydrolase-1 (GTP-CH1) pathways, which are involved in the biosynthesis of monoamines. The present study assessed this possibility in 284 healthy elderly subjects drawn from the Three-City cohort. Methods Assays included the measurement of serum interleukin-6 and C-reactive-protein, as inflammatory markers; tryptophan, kynurenine, and their ratio as index of IDO activity; and neopterin, phenylalanine, tyrosine, and nitrite, as markers of GTP-CH1 activity. In addition, structured assessments of depressive symptomatology, fatigue, and general behavioral/neurovegetative symptoms were performed. Results As expected, age correlated significantly with concentrations of immune markers and neuropsychiatric symptoms. Increased inflammation was related to reduced tryptophan concentrations and increased kynurenine levels, suggestive of IDO-induced increased tryptophan catabolism. In addition, inflammation was associated with increases in neopterin and nitrite levels and in phenylalanine concentrations at the expense of tyrosine. Interestingly, increased tryptophan catabolism was associated with the depressive symptoms of lassitude, reduced motivation, anorexia, and pessimism. In contrast, variations in markers of GTP-CH1 activity correlated more with neurovegetative symptoms, including sleep disturbance, digestive symptoms, fatigue, sickness, and motor symptoms. Conclusions These findings show that chronic low-grade inflammation in aging is associated with alterations in enzymatic pathways involved in monoamine metabolism and suggest that these alterations might participate in the pathophysiology of neuropsychiatric symptoms in elderly persons.
Author Capuron, Lucile
Féart, Catherine
Fuchs, Dietmar
Barberger-Gateau, Pascale
Aubert, Agnès
Higueret, Denise
Layé, Sophie
Schroecksnadel, Sebastian
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  surname: Capuron
  fullname: Capuron, Lucile
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  organization: Laboratory of Psychoneuroimmunology, Nutrition and Genetics, INRA, Centre Hospitalier Universitaire of Bordeaux, Bordeaux, France
– sequence: 2
  givenname: Sebastian
  surname: Schroecksnadel
  fullname: Schroecksnadel, Sebastian
  organization: Division of Biological Chemistry, Biocenter, Innsbruck Medical University, Innsbruck, Austria
– sequence: 3
  givenname: Catherine
  surname: Féart
  fullname: Féart, Catherine
  organization: INSERM, University Victor Segalen Bordeaux 2, Centre Hospitalier Universitaire of Bordeaux, Bordeaux, France
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  givenname: Agnès
  surname: Aubert
  fullname: Aubert, Agnès
  organization: Laboratory of Psychoneuroimmunology, Nutrition and Genetics, INRA, Centre Hospitalier Universitaire of Bordeaux, Bordeaux, France
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  givenname: Denise
  surname: Higueret
  fullname: Higueret, Denise
  organization: Laboratory of Biochemistry, Centre Hospitalier Universitaire of Bordeaux, Bordeaux, France
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  givenname: Pascale
  surname: Barberger-Gateau
  fullname: Barberger-Gateau, Pascale
  organization: INSERM, University Victor Segalen Bordeaux 2, Centre Hospitalier Universitaire of Bordeaux, Bordeaux, France
– sequence: 7
  givenname: Sophie
  surname: Layé
  fullname: Layé, Sophie
  organization: Laboratory of Psychoneuroimmunology, Nutrition and Genetics, INRA, Centre Hospitalier Universitaire of Bordeaux, Bordeaux, France
– sequence: 8
  givenname: Dietmar
  surname: Fuchs
  fullname: Fuchs, Dietmar
  organization: Division of Biological Chemistry, Biocenter, Innsbruck Medical University, Innsbruck, Austria
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https://www.ncbi.nlm.nih.gov/pubmed/21277567$$D View this record in MEDLINE/PubMed
https://hal.inrae.fr/hal-02646644$$DView record in HAL
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IsPeerReviewed true
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Issue 2
Keywords Aging
enzymatic pathways
tyrosine
neuropsychiatric symptoms
inflammation
tryptophan
Human
Tyrosine
Senescence
Neuropsychiatry
Tryptophan
Inflammation
Metabolism
Symptomatology
Chronic
Aminoacid
Mental disorder
Elderly
TRYPTOPHAN
AGING
ENZYMATIC PATHWAYS
TYROSINE
NEUROPSYCHIATRIC SYMPTOMS
INFLAMMATION
Language English
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Snippet Neuropsychiatric symptoms are common complaints of elderly persons. Recent data suggest that chronic low-grade inflammation, a fundamental characteristic of...
Background Neuropsychiatric symptoms are common complaints of elderly persons. Recent data suggest that chronic low-grade inflammation, a fundamental...
*BACKGROUND : Neuropsychiatric symptoms are common complaints of elderly persons. Recent data suggest that chronic low-grade inflammation, a fundamental...
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StartPage 175
SubjectTerms Aged
Aged, 80 and over
Aging
Biological and medical sciences
C-Reactive Protein - metabolism
Chronic Disease
enzymatic pathways
Enzyme-Linked Immunosorbent Assay - methods
Fasting
Fatigue - blood
Fatigue - etiology
Female
Geriatrics
Humans
Indoleamine-Pyrrole 2,3,-Dioxygenase - blood
inflammation
Inflammation - blood
Inflammation - complications
Interleukin-6 - blood
Life Sciences
Male
Medical sciences
Mental Disorders - blood
Mental Disorders - etiology
Movement Disorders
Neopterin - blood
neuropsychiatric symptoms
Nitrites - blood
Psychiatric Status Rating Scales
Psychiatry
Psychology. Psychoanalysis. Psychiatry
Psychopathology. Psychiatry
Sleep Wake Disorders - blood
Sleep Wake Disorders - etiology
tryptophan
Tryptophan - blood
tyrosine
Tyrosine - blood
Title Chronic Low-Grade Inflammation in Elderly Persons Is Associated with Altered Tryptophan and Tyrosine Metabolism: Role in Neuropsychiatric Symptoms
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https://dx.doi.org/10.1016/j.biopsych.2010.12.006
https://www.ncbi.nlm.nih.gov/pubmed/21277567
https://www.proquest.com/docview/874184845
https://hal.inrae.fr/hal-02646644
Volume 70
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