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Dermatology

Skin microbiota

Elderly health

By Pr. Markku Voutilainen
Turku University Faculty of Medicine; Turku University Hospital, Department of Gastroenterology, Turku, Finland

Gastroenterology
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Open eye of young woman showing green pupil and brown eyelashes

About this article

Created 24 August 2021
Updated 04 November 2021

The microbiota of the meibum 

Suzuki T, Sutani T, Nakai H, et al. The microbiome of the meibum and ocular surface in healthy subjects. Invest Ophtalmol Vis Sci 2020.

The meibum prevents the evaporation of the eye’s tear film, allows homeostasis of the ocular surface and has its own microbiota. Does this microbiota, and those of ocular surfaces, change with ageing? This study shows that eyelid-skin samples from young subjects had low α-diversity (Shannon index) and that Probionibacterium acnes and Staphylococcus epidermidis were the dominant species. Meibum and conjunctival-sac microbiota were different from that of the skin and characterized by a high α-diversity index consisting in a large number of bacterial species. In elderly subjects, Corynebacterium sp. and Neisseriaceae were the predominant taxa on eyelid skin and α-diversity Shannon index was significantly reduced at their meibum and conjunctival sac. Authors conclude that meibum’s microbiome is indeed altered with ageing, equally in men and in women.

Ageing and microbiome changes 

Huang S, Haiminen N, Carrieri AP, et al. Human skin, oral, and gut microbiomes predict chronological age. mSystems 2020.

We know that gut microbiome changes with age, as well as oral and skin ones. Which of them is best to predict ageing? The authors evaluated the microbiome diversity from almost 9 000 skin, saliva and intestinal samples from healthy people across 10 studies. Taxa enriched in young individuals (18 to 30 years) tended to be more abundant and prevalent than taxa enriched in elderly persons (> 60 years); and ageing may be linked to a loss of key taxa. Compared with gut and oral microbiome, the skin one was the best predictor of age (mean 3.8 yrs ± 0.45 SD). Authors identified genera and families including anaerobic bacteria (Mycoplasma, Enterobacteriaceae, Pasteurellaceae) that negatively correlated with age. Age-related changes in skin physiology (decreased sebum production, increased dryness) and host immune reactions may cause these microbiome changes.

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    Microbiota 10 - July 2020
    • Overview
      • Gut microbiota and Clostridioides difficile
    • Commented articles
      • The Mediterranean diet alters the gut microbiota in the elderly, reduces frailty and improves health: study NU-AGE
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    • Congress review
      • Gut Microbiota For Health World Summit 2020
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      • Vaginal microbiota #10
      • Skin microbiota
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    Created 24 August 2021
    Updated 04 November 2021

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    Microbiota 10 - July 2020

    Overview

    Gut microbiota and Clostridioides difficile

    Commented articles

    The Mediterranean diet alters the gut microbiota in the elderly, reduces frailty and improves health: study NU-AGE Metagenomics of the faecal virome: cumulative effect of the quantity of gluten and enteroviruses risk of coeliac disease autoimmunity in predisposed children – the TEDDY study

    Congress review

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