Abstract
Regulation of the immune system is an important function of the gut microbiota. Increasing evidence suggests that modern living conditions cause the gut microbiota to deviate from the form it took during human evolution. Contributing factors include loss of helminth infections, encountering less microbial biodiversity, and modulation of the microbiota composition by diet and antibiotic use. Thus the gut microbiota is a major mediator of the hygiene hypothesis (or as we prefer, “Old Friends” mechanism), which describes the role of organisms with which we co-evolved, and that needed to be tolerated, as crucial inducers of immunoregulation. At least partly as a consequence of reduced exposure to immunoregulatory Old Friends, many but not all of which resided in the gut, high-income countries are undergoing large increases in a wide range of chronic inflammatory disorders including allergies, autoimmunity and inflammatory bowel diseases. Depression, anxiety and reduced stress resilience are comorbid with these conditions, or can occur in individuals with persistently raised circulating levels of biomarkers of inflammation in the absence of clinically apparent peripheral inflammatory disease. Moreover poorly regulated inflammation during pregnancy might contribute to brain developmental abnormalities that underlie some cases of autism spectrum disorders and schizophrenia. In this chapter we explain how the gut microbiota drives immunoregulation, how faulty immunoregulation and inflammation predispose to psychiatric disease, and how psychological stress drives further inflammation via pathways that involve the gut and microbiota. We also outline how this two-way relationship between the brain and inflammation implicates the microbiota, Old Friends and immunoregulation in the control of stress resilience.
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Abbreviations
- ASD:
-
Autism spectrum disorders
- BH4:
-
Tetrahydrobiopterin
- CD:
-
Crohn’s disease
- CNS:
-
Central nervous system
- CRH:
-
Corticotropin-releasing hormone
- CRP:
-
C-reactive protein
- dACC:
-
Dorsal anterior cingulate cortex
- DC:
-
Dendritic cells
- DCreg:
-
Regulatory dendritic cells
- fMRI:
-
Functional magnetic resonance imaging
- GABA:
-
g-Aminobutyric acid
- GCR:
-
Glucocorticoid resistance
- HPA:
-
Hypothalamic-pituitary adrenal axis
- IBD:
-
Inflammatory bowel disease
- IBS:
-
Irritable bowel syndrome
- IDO:
-
Indoleamine-2,3-dioxygenase
- IFN-α:
-
Interferon-alpha
- IL:
-
Interleukin
- LPS:
-
Lipopolysaccharide
- MCP-1:
-
Monocyte chemoattractant protein-1
- MS:
-
Multiple sclerosis
- NO:
-
Nitric oxide
- Nod1:
-
Nucleotide-binding oligomerization domain-containing protein-1
- PBMCs:
-
Peripheral blood monocyte cells
- PET:
-
Positron emission tomography
- SCFA:
-
Short chain fatty acids
- SLE:
-
Systemic lupus erythematosus
- SNP:
-
Single nucleotide polymorphisms
- SNS:
-
Sympathetic nervous system
- SSRI:
-
Selective serotonin reuptake inhibitors
- T1D:
-
Type 1 diabetes
- TNF:
-
Tumor necrosis factor
- Treg:
-
Regulatory T cells
- UC:
-
Ulcerative colitis
- XLAAD:
-
X-linked autoimmunity-allergic dysregulation syndrome
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Acknowledgements
GAWR is supported by the National Institute for Health Research University College London Hospitals Biomedical Research Centre. CLR receives grant support from the National Center for Complementary and Alternative Medicine (R01AT004698, R01AT004698-01A1S1), the Depressive and Bipolar Disorder Alternative Treatment Foundation and The Brain and Behavior Research Foundation. He reports the following activities for the previous 2 years: advisory board participation and related travel funds for Pamlab, Lilly and North American Center for Continuing Education; development and presentation of disease state slides for Pamlab, Pfizer and Johnson & Johnson, as well as related travel funds for these activities; development of continuing medical education material for North American Center for Continuing Education and for CME Incite. CAL receives grant support from the National Institute of Mental Health (R01MH065702, R01MH086539, R01DA019921, R01MH075968), the National Science Foundation (NSF- IOS 0921969), the Depressive and Bipolar Disorder Alternative Treatment Foundation, and is the recipient of an NSF CAREER Award (NSF-IOS 0845550) and a NARSAD, Brain & Behavior Research Foundation 2010 Young Investigator Award. He reports the following activities for the previous 2 years: consultant for Enlight Biosciences.
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Rook, G.A.W., Raison, C.L., Lowry, C.A. (2014). Microbiota, Immunoregulatory Old Friends and Psychiatric Disorders. In: Lyte, M., Cryan, J. (eds) Microbial Endocrinology: The Microbiota-Gut-Brain Axis in Health and Disease. Advances in Experimental Medicine and Biology(), vol 817. Springer, New York, NY. https://doi.org/10.1007/978-1-4939-0897-4_15
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