1. Differential effects of L-tryptophan and L-leucine administration on brain resting state functional networks and plasma hormone levels
- Author
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Jürgen Drewe, Davide Zanchi, Bettina K. Wölnerhanssen, Claudia Suenderhauf, Stefan Borgwardt, Carel W. le Roux, Christoph Beglinger, Anne Christin Meyer-Gerspach, Katharina Janach, Sven Haller, and ONO Pharmaceuticals Co Ltd
- Subjects
0301 basic medicine ,Cingulate cortex ,Blood Glucose ,Male ,FOOD-INTAKE ,medicine.medical_treatment ,Somatosensory system ,Placebos ,Plasma ,0302 clinical medicine ,Insulin ,AMINO-ACIDS ,SUBJECT DIFFUSION DATA ,Default mode network ,Multidisciplinary ,GLUCAGON-LIKE PEPTIDE-1 ,Chemistry ,Tryptophan ,Brain ,Magnetic Resonance Imaging ,Healthy Volunteers ,Multidisciplinary Sciences ,medicine.anatomical_structure ,Endokrinologi och diabetes ,VOXELWISE ANALYSIS ,Antidepressive Agents, Second-Generation ,Science & Technology - Other Topics ,Female ,Radiology, Nuclear Medicine and Medical Imaging ,Adult ,medicine.medical_specialty ,Endocrinology and Diabetes ,HEALTHY-MEN ,Article ,CONNECTIVITY MRI ,03 medical and health sciences ,Young Adult ,Leucine ,AD-LIBITUM ,Internal medicine ,medicine ,Humans ,Sensory cortex ,Science & Technology ,Resting state fMRI ,INTRADUODENAL INFUSION ,Water ,SPATIAL STATISTICS ,030104 developmental biology ,Endocrinology ,Glucose ,Radiologi och bildbehandling ,Nerve Net ,Insula ,030217 neurology & neurosurgery ,Hormone - Abstract
Depending on their protein content, single meals can rapidly influence the uptake of amino acids into the brain and thereby modify brain functions. The current study investigates the effects of two different amino acids on the human gut-brain system, using a multimodal approach, integrating physiological and neuroimaging data. In a randomized, placebo-controlled trial, L-tryptophan, L-leucine, glucose and water were administered directly into the gut of 20 healthy subjects. Functional MRI (fMRI) in a resting state paradigm (RS), combined with the assessment of insulin and glucose blood concentration, was performed before and after treatment. Independent component analysis with dual regression technique was applied to RS-fMRI data. Results were corrected for multiple comparisons. In comparison to glucose and water, L-tryptophan consistently modifies the connectivity of the cingulate cortex in the default mode network, of the insula in the saliency network and of the sensory cortex in the somatosensory network. L-leucine has lesser effects on these functional networks. L-tryptophan and L-leucine also modified plasma insulin concentration. Finally, significant correlations were found between brain modifications after L-tryptophan administration and insulin plasma levels. This study shows that acute L-tryptophan and L-leucine intake directly influence the brain networks underpinning the food-reward system and appetite regulation. ispartof: SCIENTIFIC REPORTS vol:6 ispartof: location:England status: published
- Published
- 2016