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A gut-brain-skin axis?

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Created 22 April 2021
Updated 25 November 2021

Should we go further than a gut-skin axis and include the brain also?

As early as 1930, dermatologists John Stokes and Donald Pillsbury25,26, suggested that emotional states such as anxiety or depression can alter the gut microbiota and induce local or systemic inflammation27. They recommended the use of fermented milk to reintroduce beneficial microorganisms.

More precisely, stress leads to the secretion of neurotransmitters (serotonin, norepinephrine and acetylcholine). These neurotransmitters increase gut permeability, leading to local inflammation. At the same time, they also provoke systemic inflammation via the bloodstream.11,23

For example, stress hormone cortisol is thought to alter the composition of the gut microbiota and blood levels of neuroendocrine molecules (tryptamine, trimethylamine and serotonin), ultimately affecting the skin barrier and skin inflammation.25

Is the gut-brain-skin axis a two-way axis, i.e. can the skin in turn act on the gut via the nervous system?

Image
Gut-brain-skin axis

Acne and atopic dermatitis 

This gut-brain-skin axis is implicated in certain skin diseases. For example, upregulation and strong expression of substance P (a neurotransmitter and neuromodulator of the central and peripheral nervous systems) are observed in both acne and gut dysbiosis. Substance P is known to trigger the expression of many pro-inflammatory mediators implicated in the development of acne (IL-1, IL-6, TNF-α, PPAR-γ).22,23

The gut-brain-skin axis is also thought to be involved in atopic dermatitis.25 An altered gut microbiota may modify the production of various neurotransmitters and neuromodulators, affecting the functioning of the skin barrier and immune system, two key parameters of the pathophysiology of atopic dermatitis.25

Tryptophan produced by the gut microbiota is thought to cause skin itching, while lactobacilli and bifidobacteria may inhibit these sensations.25 Moreover, some researchers ask whether the gut-brain-skin axis is a two-way axis: can the skin in turn act on the gut via the nervous system?22

Sources

11 Ellis SR, Nguyen M, Vaughn AR, et al. The Skin and Gut Microbiome and Its Role in Common Dermatologic Conditions. Microorganisms. 2019;7(11):550.

22 O'Neill CA, Monteleone G, McLaughlin JT, et al. The gut-skin axis in health and disease: A paradigm with therapeutic implications. Bioessays. 2016;38(11):1167-1176.

23 Salem I, Ramser A, Isham N, et al. The Gut Microbiome as a Major Regulator of the Gut-Skin Axis. Front Microbiol. 2018 Jul 10;9:1459.

24 Forbes JD, Van Domselaar G, Bernstein CN. The Gut Microbiota in Immune-Mediated Inflammatory Diseases. Front Microbiol. 2016 Jul 11;7:1081.

25 Lee SY, Lee E, Park YM, et al. Microbiome in the Gut-Skin Axis in Atopic Dermatitis. Allergy Asthma Immunol Res. 2018;10(4):354-362.

26 Stokes JH, Pillsbury DH: The effect on the skin of emotional and nervous states: theoretical and practical consideration of a gastrointestinal mechanism. Arch Dermatol Syphilol 1930, 22:962-93.

27 Bowe WP, Logan AC. Acne vulgaris, probiotics and the gut-brain-skin axis - back to the future?. Gut Pathog. 2011;3(1):1. Published 2011 Jan 31. doi:10.1186/1757-4749-3-1.

Old sources

 

 

 

Tags
Psoriasis Gut-brain axis Acne Skin health Rosacea Gut-skin axis Atopic Dermatitis

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    Focus
    Skin under triple influences : gut, brain, skin microbiota
    • The skin microbiota
      • A unique set of skin microbiota for each individual
      • Factors affecting the skin microbiota
      • Functions of the microbiota and its interactions with the host
    • Skin diseases associated with a dysbiosis
      • Skin diseases associated with a dysbiosis
      • Non-pathological skin conditions associated with a dysbiosis
    • The gut-skin axis
      • Psoriasis, atopic dermatitis, rosacea: gut-skin axis involved
      • A gut-brain-skin axis?
    • Modulating the skin microbiota
      • Modulating the skin microbiota via topical applications
      • Modulating the skin microbiota with oral solutions
    • Expert opinion
      • Dr. Markus Eger : Probiotics, a complementary therapeutic option
    Created 22 April 2021
    Updated 25 November 2021

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    Psoriasis, atopic dermatitis, rosacea: gut-skin axis involved
    Modulating the skin microbiota via topical applications
    Focus

    Skin under triple influences : gut, brain, skin microbiota

    The skin microbiota

    A unique set of skin microbiota for each individual Factors affecting the skin microbiota Functions of the microbiota and its interactions with the host

    Skin diseases associated with a dysbiosis

    Skin diseases associated with a dysbiosis Non-pathological skin conditions associated with a dysbiosis

    The gut-skin axis

    Psoriasis, atopic dermatitis, rosacea: gut-skin axis involved A gut-brain-skin axis?

    Modulating the skin microbiota

    Modulating the skin microbiota via topical applications Modulating the skin microbiota with oral solutions

    Expert opinion

    Dr. Markus Eger : Probiotics, a complementary therapeutic option
    Dermatology

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