Cited by 74Dermatology and Skin DiseasesContact Dermatitis and AllergiesGut microbiota and health

A mixed community of skin microbiome representatives influences cutaneous processes more than individual members

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Loomis, Kristin H., Wu, Susan K., Ernlund, Amanda, Zudock, Kristina, Reno, Allison, Blount, Kianna, Karig, David K.·2021·Microbiome

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Abstract

Background: Skin, the largest organ of the human body by weight, hosts a diversity of microorganisms that can influence health. The microbial residents of the skin are now appreciated for their roles in host immune interactions, wound healing, colonization resistance, and various skin disorders. Still, much remains to be discovered in terms of the host pathways influenced by skin microorganisms, as well as the higher-level skin properties impacted through these microbe-host interactions. Towards this direction, recent efforts using mouse models point to pronounced changes in the transcriptional profiles of the skin in response to the presence of a microbial community. However, there is a need to quantify the roles of microorganisms at both the individual and community-level in healthy human skin. In this study, we utilize human skin equivalents to study the effects of individual taxa and a microbial community in a precisely controlled context. Through transcriptomics analysis, we identify key genes and pathways influenced by skin microbes, and we also characterize higher-level impacts on skin processes and properties through histological analyses. Results: The presence of a microbiome on a 3D skin tissue model led to significantly altered patterns of gene expression, influencing genes involved in the regulation of apoptosis, proliferation, and the extracellular matrix (among others). Moreover, microbiome treatment influenced the thickness of the epidermal layer, reduced the number of actively proliferating cells, and increased filaggrin expression. Many of these findings were evident upon treatment with the mixed community, but either not detected or less pronounced in treatments by single microorganisms, underscoring the impact that a diverse skin microbiome has on the host. Conclusions: This work contributes to the understanding of how microbiome constituents individually and collectively influence human skin processes and properties. The results show that, while it is important to understand the effect of individual microbes on the host, a full community of microbes has unique and pronounced effects on the skin. Thus, in its impacts on the host, the skin microbiome is more than the sum of its parts.

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  • Loomis et al. found a community effect in microbiome-host signaling: effects of the microbial community on epidermal thickness, epidermal cell proliferation, and filaggrin production were not entirely driven by any single microorganism.

    “From the obtained results, the authors suggested a community effect in microbiome-host signaling since the effects obtained by the presence of the microbial community (i.e., changes in epidermal thickness, epidermal cell proliferation, and filaggrin production) were not entirely driven by any single microorganism.”
  • Most skin models used nowadays for the study of barrier functions lack skin appendages such as sebaceous glands and hair follicles; as a consequence, it is difficult or even impossible to co-culture bacteria strains that grow within anaerobic environments like Cutibacterium, limiting the culturing of a complete human skin microbiota.

    “However, most of the skin models used nowadays for the study of barrier functions lack skin appendages such as sebaceous glands and hair follicles; as a consequence, it is difficult or even impossible to co-culture bacteria strains that grow within anaerobic environments like Cutibacterium, limiting in this way the culturing of a complete human skin microbiota [136].”

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Research works printed but not linked: 1

  1. [10]Timm, C. M.; Loomis, Kristin H; Stone, W.; Mehoke, Thomas; Brensinger, Bryan; Pellicore, M. R.; Staniczenko, Philip; Charles, Curtisha; Nayak, S.; Karig, David. Isolation and characterization of diverse microbial representatives from the human skin microbiome. Microbiome 2020. PMC7178971 32321582

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Authors
Loomis, K. H., Wu, S. K., Ernlund, A., Zudock, K., Reno, A., Blount, K., & Karig, D. K.
Affiliations
  • Johns Hopkins University Applied Physics Laboratory (US)
  • Clemson University (US)
  • Johns Hopkins University (US)
Corresponding author
Karig, David K.
Venue
Microbiome
Published
2021-01-22
Volume
9
Issue
1
Pages
22-22
ISSN
2049-2618 (ISSN-L)
OpenAlex
W3125132889
Cited by
74
References
75
Citations by year
2026: 13 · 2025: 19 · 2024: 14 · 2023: 14 · 2022: 7 · 2021: 7
FWCI
9.33
Type
journal article
Language
en
Open access
Locations
  • Microbiome (publishedVersion, cc-by)
  • Research Square (acceptedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
Army Research Laboratory (W911NF-14-1-0490)
Topics
  • Health Sciences › Medicine › Dermatology › Dermatology and Skin Diseases
  • Health Sciences › Medicine › Dermatology › Contact Dermatitis and Allergies
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gut microbiota and health
Keywords
skin microbiome, human skin equivalents, gene expression, apoptosis, cell proliferation, extracellular matrix, filaggrin, epidermal thickness, host-microbe interactions, skin barrier
MeSH terms
Host Microbial Interactions, Filaggrin Proteins, Humans, Skin, Skin Physiological Phenomena, Gene Expression Profiling, Microbiota, Healthy Volunteers

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