Intersections between the gut-brain-microbiota axis and the pathophysiological mechanisms of depressive disorders: a narrative review.
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Abstract
Depression impacts millions of people globally, with severe individual and societal repercussions. Despite decades of efforts, its etiology remains uncertain. A growing body of literature has been dedicated to exploring the interactions of the gut-brain-microbiota axis and its association with the onset and progression of neurological and neuropsychiatric conditions, including depression. In this article, we review the literature on the intersections between the mentioned axis and the pathophysiological mechanisms of depressive disorders. To do so, a search for full articles published from 2018 onwards, indexed in the PubMed/MEDLINE database, was conducted. We address the components of the gut-brain-microbiota axis, the function of the intestinal barrier, the role of the autonomic nervous system, and the hypothalamus-pituitary-adrenal axis in the interactions between the brain and gut, in addition to the apparent link between stress, dysbiosis, and depression mediated by pro-inflammatory cytokines. Although it is not possible, given the current body of evidence, to establish a causal relationship between gut dysbiosis and depression, understanding the intersections between these two conditions paves the way for research aimed at determining biomarkers and contributes to expanding the scope of therapeutic interventions.
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