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Brain Functional Network and Amino Acid Metabolism Association in Females with Subclinical Depression

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  • Shanguang Zhao

    (Centre for Sport and Exercise Sciences, University Malaya, Kuala Lumpur 50603, Malaysia)

  • Selina Khoo

    (Centre for Sport and Exercise Sciences, University Malaya, Kuala Lumpur 50603, Malaysia)

  • Siew-Cheok Ng

    (Department of Biomedical Engineering, Faculty of Engineering, University Malaya, Kuala Lumpur 50603, Malaysia)

  • Aiping Chi

    (Institute of Physical Education, Shaanxi Normal University, Xi’an 710119, China)

Abstract

This study aimed to investigate the association between complex brain functional networks and the metabolites in urine in subclinical depression. Electroencephalography (EEG) signals were recorded from 78 female college students, including 40 with subclinical depression (ScD) and 38 healthy controls (HC). The phase delay index was utilized to construct functional connectivity networks and quantify the topological properties of brain networks using graph theory. Meanwhile, the urine of all participants was collected for non-targeted LC-MS metabolic analysis to screen differential metabolites. The global efficiency was significantly increased in the α-2, β-1, and β-2 bands, while the characteristic path length of β-1 and β-2 and the clustering coefficient of β-2 were decreased in the ScD group. The severity of depression was negatively correlated with the level of cortisone ( p = 0.016, r = −0.40). The metabolic pathways, including phenylalanine metabolism, phenylalanine tyrosine tryptophan biosynthesis, and nitrogen metabolism, were disturbed in the ScD group. The three metabolic pathways were negatively correlated ( p = 0.014, r = −0.493) with the global efficiency of the brain network of the β-2 band, whereas they were positively correlated ( p = 0.014, r = 0.493) with the characteristic path length of the β-2 band. They were mainly associated with low levels of L-phenylalanine, and the highest correlation sparsity was 0.11. The disturbance of phenylalanine metabolism and the phenylalanine, tryptophan, tyrosine biosynthesis pathways cause depressive symptoms and changes in functional brain networks. The decrease in the L-phenylalanine level may be related to the randomization trend of the β-1 frequency brain functional network.

Suggested Citation

  • Shanguang Zhao & Selina Khoo & Siew-Cheok Ng & Aiping Chi, 2022. "Brain Functional Network and Amino Acid Metabolism Association in Females with Subclinical Depression," IJERPH, MDPI, vol. 19(6), pages 1-15, March.
  • Handle: RePEc:gam:jijerp:v:19:y:2022:i:6:p:3321-:d:769092
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    References listed on IDEAS

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    1. Dylan Dodd & Matthew H. Spitzer & William Van Treuren & Bryan D. Merrill & Andrew J. Hryckowian & Steven K. Higginbottom & Anthony Le & Tina M. Cowan & Garry P. Nolan & Michael A. Fischbach & Justin L, 2017. "A gut bacterial pathway metabolizes aromatic amino acids into nine circulating metabolites," Nature, Nature, vol. 551(7682), pages 648-652, November.
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