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Mechanisms Underlying the Anti-Depressive Effects of Regular Tea Consumption

Department of Tea Science, College of Horticulture Science, South China Agricultural University, Guangzhou 510640, China
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Author to whom correspondence should be addressed.
Nutrients 2019, 11(6), 1361; https://doi.org/10.3390/nu11061361
Received: 8 May 2019 / Revised: 3 June 2019 / Accepted: 11 June 2019 / Published: 17 June 2019
(This article belongs to the Special Issue Polyphenol-Rich Foods for Human Health and Disease)
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Abstract

This article is a comprehensive review of the literature pertaining to the antidepressant effects and mechanisms of regular tea consumption. Meta-data supplemented with recent observational studies were first analyzed to assess the association between tea consumption and depression risk. The literature reported risk ratios (RR) were 0.69 with 95% confidence intervals of 0.62–0.77. Next, we thoroughly reviewed human trials, mouse models, and in vitro experiments to determine the predominant mechanisms underlying the observed linear relationship between tea consumption and reduced risk of depression. Current theories on the neurobiology of depression were utilized to map tea-mediated mechanisms of antidepressant activity onto an integrated framework of depression pathology. The major nodes within the network framework of depression included hypothalamic-pituitary-adrenal (HPA) axis hyperactivity, inflammation, weakened monoaminergic systems, reduced neurogenesis/neuroplasticity, and poor microbiome diversity affecting the gut–brain axis. We detailed how each node has subsystems within them, including signaling pathways, specific target proteins, or transporters that interface with compounds in tea, mediating their antidepressant effects. A major pathway was found to be the ERK/CREB/BDNF signaling pathway, up-regulated by a number of compounds in tea including teasaponin, L-theanine, EGCG and combinations of tea catechins and their metabolites. Black tea theaflavins and EGCG are potent anti-inflammatory agents via down-regulation of NF-κB signaling. Multiple compounds in tea are effective modulators of dopaminergic activity and the gut–brain axis. Taken together, our findings show that constituents found in all major tea types, predominantly L-theanine, polyphenols and polyphenol metabolites, are capable of functioning through multiple pathways simultaneously to collectively reduce the risk of depression. View Full-Text
Keywords: Camellia sinensis; depression; inflammation; HPA axis; gut–brain axis; neurogenesis; neurotransmission; SCFA; EGCG; theaflavin; L-theanine Camellia sinensis; depression; inflammation; HPA axis; gut–brain axis; neurogenesis; neurotransmission; SCFA; EGCG; theaflavin; L-theanine
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Rothenberg, D.O.; Zhang, L. Mechanisms Underlying the Anti-Depressive Effects of Regular Tea Consumption. Nutrients 2019, 11, 1361.

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