How does sun exposure affect skin microbiota composition and diversity? FrontAging OfficialUoM microbiota skin sun tan health
By Neha MathurAug 10 2023Reviewed by Sophia Coveney In a recent study published in Frontiers in Aging, researchers recruited 21 healthy North European volunteers who agreed to go on a holiday in a sunny destination for a minimum of seven days to study how ultraviolet radiation exposure and other sun-seeking behaviors impacted their skin microbiota composition, diversity, and overall skin health.
Skin-residing microbes protect the human skin from UVR damage by releasing cytokines, such as tumor necrosis factor α and interleukin-6. So, their disruption likely activates the host immune system. About the study In the present study, researchers examined the effect of the sun-seeking behavior of all participants on their epidermal melanin levels during a high sun exposure holiday.
Results According to the authors, it is one of the first studies on the effects of various sun-related behaviors during a 'real-world' high sun exposure holiday setting on the composition and diversity of the skin microbiota and skin health. The researchers remarkably showed that the development of a tan was markedly associated with a lower relative abundance of Proteobacteria post-holidays , with its community structure recovering by day 28 after the holidays ended.
Many previous studies have described the ill effects of disruptions in microbiome populations and components in different bodily sites. For instance, Hanski et al. found an association of reduced skin bacterial richness with atopic dermatitis. It raises the concern that the observed loss of bacterial diversity with increased facultative tanning might also impact skin health.
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