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Caspani G, Kennedy S, Foster JA, et al. Gut microbial metabolites in depression: understanding the biochemical mechanisms. Microb Cell. 2019;6(10):454-481doi: 10.15698/mic2019.10.693.
Caspani, G., Kennedy, S., Foster, J. A., & Swann, J. (2019). Gut microbial metabolites in depression: understanding the biochemical mechanisms. Microbial cell (Graz, Austria), 6(10), 454-481. https://doi.org/10.15698/mic2019.10.693
Caspani, Giorgia, et al. "Gut microbial metabolites in depression: understanding the biochemical mechanisms." Microbial cell (Graz, Austria) vol. 6,10 (2019): 454-481. doi: https://doi.org/10.15698/mic2019.10.693
Caspani G, Kennedy S, Foster JA, Swann J. Gut microbial metabolites in depression: understanding the biochemical mechanisms. Microb Cell. 2019 Sep 27;6(10):454-481. doi: 10.15698/mic2019.10.693. PMID: 31646148; PMCID: PMC6780009.
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Microb Cell. 2019 Sep 27;6(10):454-481. doi: 10.15698/mic2019.10.693.

Gut microbial metabolites in depression: understanding the biochemical mechanisms.

Microbial cell (Graz, Austria)

Giorgia Caspani, Sidney Kennedy, Jane A Foster, Jonathan Swann

Affiliations

  1. Computational Systems Medicine, Department of Surgery and Cancer, Imperial College London, UK.
  2. Centre for Mental Health and Krembil Research Centre, University Health Network, University of Toronto, Toronto, ON, CA.
  3. Mental Health Services, St. Michael's Hospital, University of Toronto, Toronto, ON, CA.
  4. Department of Psychiatry, University of Toronto, Toronto, ON, CA.
  5. Keenan Research Centre for Biomedical Science, Li Ka Shing Knowledge Institute, St. Michael's Hospital, Toronto, ON, CA.
  6. Department of Psychiatry & Behavioral Neurosciences, McMaster University, Hamilton, Ontario, Canada.

PMID: 31646148 PMCID: PMC6780009 DOI: 10.15698/mic2019.10.693

Abstract

Gastrointestinal and central function are intrinsically connected by the gut microbiota, an ecosystem that has co-evolved with the host to expand its biotransformational capabilities and interact with host physiological processes by means of its metabolic products. Abnormalities in this microbiota-gut-brain axis have emerged as a key component in the pathophysiology of depression, leading to more research attempting to understand the neuroactive potential of the products of gut microbial metabolism. This review explores the potential for the gut microbiota to contribute to depression and focuses on the role that microbially-derived molecules - neurotransmitters, short-chain fatty acids, indoles, bile acids, choline metabolites, lactate and vitamins - play in the context of emotional behavior. The future of gut-brain axis research lies is moving away from association, towards the mechanisms underlying the relationship between the gut bacteria and depressive behavior. We propose that direct and indirect mechanisms exist through which gut microbial metabolites affect depressive behavior: these include (i) direct stimulation of central receptors, (ii) peripheral stimulation of neural, endocrine, and immune mediators, and (iii) epigenetic regulation of histone acetylation and DNA methylation. Elucidating these mechanisms is essential to expand our understanding of the etiology of depression, and to develop new strategies to harness the beneficial psychotropic effects of these molecules. Overall, the review highlights the potential for dietary interventions to represent such novel therapeutic strategies for major depressive disorder.

Keywords: bile acids; indole; lactate; mental health; microbiome; tryptophan; vitamins

Conflict of interest statement

Conflict of interest: The authors declare no conflict of interest.

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