Host responses in an ex-vivo human skin model challenged with Malassezia sympodialis

Dora E Corzo Leon; Donna M MacCallum; Carol A Munro

doi:10.3389/fcimb.2020.561382

Host responses in an ex-vivo human skin model challenged with Malassezia sympodialis

Dora E Corzo Leon, Donna M MacCallum, Carol A Munro^* (Corresponding Author)

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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Abstract

Malassezia species are a major part of the normal mycobiota and colonize mainly sebum-rich skin regions of the body. This group of fungi cause a variety of infections such as pityriasis versicolor, folliculitis, and fungaemia. In particular, Malassezia sympodialis and its allergens have been associated with non-infective inflammatory diseases such as seborrheic dermatitis and atopic eczema. The aim of this study was to investigate the host response to M. sympodialis on oily skin (supplemented with oleic acid) and non-oily skin using an ex vivo human skin model. Host-pathogen interactions were analyzed by SEM, histology, gene expression, immunoassays and dual species proteomics. The skin response to M. sympodialis was characterized by increased expression of the genes encoding β-defensin 3 and RNase7, and by high levels of S100 proteins in tissue. Supplementation of oleic acid onto skin was associated with direct contact of yeasts with keratinocytes and epidermal damage. In oily conditions, there was increased expression of IL18 but no expression of antimicrobial peptide genes in the skin's response to M. sympodialis. In supernatants from inoculated skin plus oleic acid, TNFα, IL-6, and IL1-β levels were decreased and IL-18 levels were significantly increased.

Original language	English
Article number	561382
Number of pages	14
Journal	Frontiers in cellular and infection microbiology
Volume	10
DOIs	https://doi.org/10.3389/fcimb.2020.561382
Publication status	Published - 21 Jan 2021

Bibliographical note

FUNDING:
This project was funded by a Wellcome Trust Strategic Award for Medical Mycology and Fungal Immunology (097377/Z/11/Z). We would like to acknowledge the support of Internal Funding through a Core Facilities Voucher from the University of Aberdeen.
ACKNOWLEDGMENTS:
The authors gratefully acknowledge the Technology hubs at the University of
Aberdeen (Microscopy and Histology, qPCR facility and Proteomics) for their support, sample processing and training. Special thanks to Professor Annika Scheynius from the Karolinska Institute, Stockholm, Sweden for sharing her expertise and constructive discussions and for giving us the inspiration to work on Malassezia.

Keywords

malassezia sympodialis
skin model
immune response
cytokines
AMPs

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.3389/fcimb.2020.561382Licence: CC BY

CorzoLeon_etal_fcimb_Host_Responses_VOR
Copyright © 2021 Corzo-León, MacCallum and Munro. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. https://creativecommons.org/licenses/by/4.0/
Final published version, 7.73 MBLicence: CC BY

https://www.frontiersin.org/articles/10.3389/fcimb.2020.561382/full#supplementary-materialLicence: Unspecified

Aberdeen Proteomics
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Medical Sciences
Research Facilities: Facility
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Cite this

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title = "Host responses in an ex-vivo human skin model challenged with Malassezia sympodialis",

abstract = " Malassezia species are a major part of the normal mycobiota and colonize mainly sebum-rich skin regions of the body. This group of fungi cause a variety of infections such as pityriasis versicolor, folliculitis, and fungaemia. In particular, Malassezia sympodialis and its allergens have been associated with non-infective inflammatory diseases such as seborrheic dermatitis and atopic eczema. The aim of this study was to investigate the host response to M. sympodialis on oily skin (supplemented with oleic acid) and non-oily skin using an ex vivo human skin model. Host-pathogen interactions were analyzed by SEM, histology, gene expression, immunoassays and dual species proteomics. The skin response to M. sympodialis was characterized by increased expression of the genes encoding β-defensin 3 and RNase7, and by high levels of S100 proteins in tissue. Supplementation of oleic acid onto skin was associated with direct contact of yeasts with keratinocytes and epidermal damage. In oily conditions, there was increased expression of IL18 but no expression of antimicrobial peptide genes in the skin's response to M. sympodialis. In supernatants from inoculated skin plus oleic acid, TNFα, IL-6, and IL1-β levels were decreased and IL-18 levels were significantly increased. ",

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author = "{Corzo Leon}, {Dora E} and MacCallum, {Donna M} and Munro, {Carol A}",

note = "FUNDING: This project was funded by a Wellcome Trust Strategic Award for Medical Mycology and Fungal Immunology (097377/Z/11/Z). We would like to acknowledge the support of Internal Funding through a Core Facilities Voucher from the University of Aberdeen. ACKNOWLEDGMENTS: The authors gratefully acknowledge the Technology hubs at the University of Aberdeen (Microscopy and Histology, qPCR facility and Proteomics) for their support, sample processing and training. Special thanks to Professor Annika Scheynius from the Karolinska Institute, Stockholm, Sweden for sharing her expertise and constructive discussions and for giving us the inspiration to work on Malassezia. ",

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AU - Munro, Carol A

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N2 - Malassezia species are a major part of the normal mycobiota and colonize mainly sebum-rich skin regions of the body. This group of fungi cause a variety of infections such as pityriasis versicolor, folliculitis, and fungaemia. In particular, Malassezia sympodialis and its allergens have been associated with non-infective inflammatory diseases such as seborrheic dermatitis and atopic eczema. The aim of this study was to investigate the host response to M. sympodialis on oily skin (supplemented with oleic acid) and non-oily skin using an ex vivo human skin model. Host-pathogen interactions were analyzed by SEM, histology, gene expression, immunoassays and dual species proteomics. The skin response to M. sympodialis was characterized by increased expression of the genes encoding β-defensin 3 and RNase7, and by high levels of S100 proteins in tissue. Supplementation of oleic acid onto skin was associated with direct contact of yeasts with keratinocytes and epidermal damage. In oily conditions, there was increased expression of IL18 but no expression of antimicrobial peptide genes in the skin's response to M. sympodialis. In supernatants from inoculated skin plus oleic acid, TNFα, IL-6, and IL1-β levels were decreased and IL-18 levels were significantly increased.

AB - Malassezia species are a major part of the normal mycobiota and colonize mainly sebum-rich skin regions of the body. This group of fungi cause a variety of infections such as pityriasis versicolor, folliculitis, and fungaemia. In particular, Malassezia sympodialis and its allergens have been associated with non-infective inflammatory diseases such as seborrheic dermatitis and atopic eczema. The aim of this study was to investigate the host response to M. sympodialis on oily skin (supplemented with oleic acid) and non-oily skin using an ex vivo human skin model. Host-pathogen interactions were analyzed by SEM, histology, gene expression, immunoassays and dual species proteomics. The skin response to M. sympodialis was characterized by increased expression of the genes encoding β-defensin 3 and RNase7, and by high levels of S100 proteins in tissue. Supplementation of oleic acid onto skin was associated with direct contact of yeasts with keratinocytes and epidermal damage. In oily conditions, there was increased expression of IL18 but no expression of antimicrobial peptide genes in the skin's response to M. sympodialis. In supernatants from inoculated skin plus oleic acid, TNFα, IL-6, and IL1-β levels were decreased and IL-18 levels were significantly increased.

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KW - cytokines

KW - AMPs

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DO - 10.3389/fcimb.2020.561382

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JO - Frontiers in cellular and infection microbiology

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ER -

Host responses in an ex-vivo human skin model challenged with Malassezia sympodialis

Abstract

Bibliographical note

Keywords

UN SDGs

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Microscopy and Histology

qPCR Facility

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