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Gastroenterology

Focus on the gut-brain axis

Functional gastrointestinal disorders
Pediatrics Gastroenterology

Psychic disorders influence the development of FGIDs, and conversely, through the gut-brain axis. In this regard, the intestinal microbiota could have an impact on the expression of psychiatric symptoms.

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About this article

Created 15 October 2019
Updated 27 October 2021

GUT-BRAIN: BIDIRECTIONAL COMMUNICATION

Psychological and psychosocial factors are key to understanding the pathophysiology of FGIDs. Psychic disorders (anxiety, depression, neurosis…) are frequent comorbidities in patients with FGIDs. It is however difficult to determine whether the former generate the latter, or if it is the opposite.4,5,6 Recent studies clearly concluded that bidirectionality is at play, i.e. a reciprocal influence. At a visceral level, exchanges are based on the enteric nervous system and substances produced by intestinal bacteria (SCFA, metabolites…). At a central level, the involved structures are those of the emotional motor system (anterior cingulate cortex, hippocampus, hypothalamus…).4,5,6

ROLE OF THE GUT-BRAIN AXIS IN IBS

Animal models have revealed that bidirectional communication was disrupted in patients with IBS, although mechanisms ensuring communication between microbiota and brain have not been elucidated. However, several elements that appear to contribute to this mechanism have been identified: the microbiota sends signals to the CNS through enteroendocrine cells (release of serotonin), dendritic cells and B-cells (release of cytokines), products of bacterial metabolism (SCFA, GABA…) and stimulation of vagal afferent fibers. In the other direction, stress and feelings affect the composition of the microbiota through stress hormones and sympathetic nervous system.4,5,6

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Focus-on-the-gut-brain-axis-infography1
Sources

4 Marteau P, Doré J. Gut microbiota, a full fledged organ. John Libbey Eurotext. 2017

5 De Palma G, Collins SM, Bercik P. The microbiota-gut-brain axis in functional gastrointestinal disorders. Gut Microbes. 2014;5(3):419-429.

6 Fukui H, Xu X, Miwa H. Role of Gut Microbiota-Gut Hormone Axis in the Pathophysiology of Functional Gastrointestinal Disorders. J Neurogastroenterol Motil. 2018;24(3):367-386.

7 Devanarayana NM, Rajindrajith S. Irritable bowel syndrome in children: Current knowledge, challenges and opportunities. World J Gastroenterol. 2018;24(21):2211-2235.

 

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IBS Dysbiosis Infant Colic Gut health Functional gastrointestinal disorders Baby Health

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    Focus
    Functional gastrointestinal disorders from childhood to adulthood
    • Pathophysiology
      • Functional gastrointestinal disorders: a set of diseases defined in correlation with the intestinal microbiota
      • Focus on the gut-brain axis
    • FGIDS: from infants to adults
      • In newborns
      • In children and adolescents
      • In adults
    • What could be the role of microbiota modulation?
      • Modulation of the microbiota by FMT: controversial results
      • FODMAP-free diet: not for all patients
      • Probiotics: what are the benefits?
    • Expert opinion
      • Dr. Marc Bellaiche: Managing FGIDs in children
    Created 15 October 2019
    Updated 27 October 2021

    About this article

    To know more about this topic.

    Main topic

    Functional gastrointestinal disorders

    Medical practice

    Pediatrics Gastroenterology

    Content type

    Dossier detail
    Functional gastrointestinal disorders: a set of diseases defined in correlation with the intestinal microbiota
    In newborns
    Focus

    Functional gastrointestinal disorders from childhood to adulthood

    Pathophysiology

    Functional gastrointestinal disorders: a set of diseases defined in correlation with the intestinal microbiota Focus on the gut-brain axis

    FGIDS: from infants to adults

    In newborns In children and adolescents In adults

    What could be the role of microbiota modulation?

    Modulation of the microbiota by FMT: controversial results FODMAP-free diet: not for all patients Probiotics: what are the benefits?

    Expert opinion

    Dr. Marc Bellaiche: Managing FGIDs in children

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    L’axe intestin-cerveau dans le stress lié à la discrimination
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