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Stenbæk DS, Einarsdottir HS, Goregliad-Fjaellingsdal T, Knudsen GM, Frokjaer VG, Hasselbalch SG. Evaluation of acute tryptophan depletion and sham depletion with a gelatin-based collagen peptide protein mixture. Eur Neuropsychopharmacol 2016; 26:147-149. [PMID: 26655163 DOI: 10.1016/j.euroneuro.2015.11.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Accepted: 11/13/2015] [Indexed: 11/29/2022]
Abstract
Acute Tryptophan Depletion (ATD) is a dietary method used to modulate central 5-HT to study the effects of temporarily reduced 5-HT synthesis. The aim of this study is to evaluate a novel method of ATD using a gelatin-based collagen peptide (CP) mixture. We administered CP-Trp or CP+Trp mixtures to 29 healthy volunteers; 13 from a randomized, double-blinded crossover study and sixteen from a randomized, double-blinded study run in our laboratory. Plasma amino acids, mood, side effects, cortisol concentrations, mean arterial blood pressure and heart rate were measured at multiple time-points. Repeated measures analysis of variance and Wilcoxon or Mann-Whitney U non-parametric tests were used to analyze the effects of intervention. Intake of the CP-Trp mixture efficiently reduced plasma Trp; however, the CP+Trp mixture induced a large significant increase in plasma Trp. No other significant effects of CP-Trp compared to CP+Trp were observed. The transient increase in plasma Trp after CP+Trp may impair comparison to the CP-Trp and we therefore recommend in future studies to use a smaller dose of Trp supplement to the CP mixture.
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Affiliation(s)
- D S Stenbæk
- Center for Integrated Molecular Brain Imaging & Neurobiology Research Unit, Rigshospitalet, Blegdamsvej 9, 2100 Copenhagen, Denmark; Faculty of Health and Medical Science, University of Copenhagen, Denmark.
| | - H S Einarsdottir
- Center for Integrated Molecular Brain Imaging & Neurobiology Research Unit, Rigshospitalet, Blegdamsvej 9, 2100 Copenhagen, Denmark; Faculty of Health and Medical Science, University of Copenhagen, Denmark
| | - T Goregliad-Fjaellingsdal
- Center for Integrated Molecular Brain Imaging & Neurobiology Research Unit, Rigshospitalet, Blegdamsvej 9, 2100 Copenhagen, Denmark
| | - G M Knudsen
- Center for Integrated Molecular Brain Imaging & Neurobiology Research Unit, Rigshospitalet, Blegdamsvej 9, 2100 Copenhagen, Denmark; Faculty of Health and Medical Science, University of Copenhagen, Denmark
| | - V G Frokjaer
- Center for Integrated Molecular Brain Imaging & Neurobiology Research Unit, Rigshospitalet, Blegdamsvej 9, 2100 Copenhagen, Denmark
| | - S G Hasselbalch
- Center for Integrated Molecular Brain Imaging & Neurobiology Research Unit, Rigshospitalet, Blegdamsvej 9, 2100 Copenhagen, Denmark; Faculty of Health and Medical Science, University of Copenhagen, Denmark; Danish Dementia Research Centre, Rigshospitalet, Blegdamsvej 9, 2100 Copenhagen, Denmark
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