Microbiota-immune interactions: from gut to brain
Abstract
The vast diversity of bacteria that inhabit the gastrointestinal tract strongly influence host physiology, not only nutrient metabolism but also immune system development and function. The complexity of the microbiota is matched by the complexity of the host immune system, where they have coevolved to maintain homeostasis ensuring the mutualistic host-microbial relationship. Numerous studies in recent years investigating the gut-brain axis have demonstrated an important role for the gut microbiota in modulating brain development and function, with the immune system serving as an important coordinator of these interactions. Gut bacteria can modulate not only gut-resident immune cells but also brain-resident immune cells. Activation of the immune system in the gut and in the brain are implicated in responses to neuroinflammation, brain injury, as well as changes in neurogenesis and plasticity. Impairments in this bidirectional communication are implicated in the etiopathogenesis of psychiatric and neurodevelopmental diseases and disorders, including autism spectrum disorders, or comorbidities associated with Gastrointestinal diseases, including inflammatory bowel diseases, where dysbiosis is commonly seen. Consequently, probiotics, or beneficial microbes, are being recognized as promising therapeutic targets to modulate behavior and brain development by modulating the gut microbiota. Here we review the role of microbiota-immune interactions in the gut and the brain during homeostasis and disease and their impact on gut-brain communication, brain function, and behavior as well as the use of probiotics in central nervous system alterations.
Statement of novelty: The microbiota-gut-brain axis is increasingly recognized as an important physiological pathway for maintaining health and impacting the brain and central nervous system. Increasing evidence suggests that the immune system is crucial for gut-brain signaling. In this review, we highlight the critical studies in the literature that identify the key immune pathways involved.
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LymphoSign Journal
Volume 7 • Number 1 • March 2020
Pages: 1 - 23
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Received: 18 November 2019
Accepted: 17 January 2020
Accepted manuscript online: 27 January 2020
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EloisaSalvo-Romero, PatriciaStokes, and Mélanie G.Gareau. 2020. Microbiota-immune interactions: from gut to brain. LymphoSign Journal.
7(1): 1-23. https://doi.org/10.14785/lymphosign-2019-0018
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