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Colonization of epidermal tissue by Staphylococcus aureus produces localized hypoxia and stimulates secretion of antioxidant and caspase-14 proteins.

Authors
  • Lone, Abdul G
  • Atci, Erhan
  • Renslow, Ryan
  • Beyenal, Haluk
  • Noh, Susan
  • Fransson, Boel
  • Abu-Lail, Nehal
  • Park, Jeong-Jin
  • Gang, David R
  • Call, Douglas R
Type
Published Article
Journal
Infection and Immunity
Publisher
American Society for Microbiology
Publication Date
Aug 01, 2015
Volume
83
Issue
8
Pages
3026–3034
Identifiers
DOI: 10.1128/IAI.00175-15
PMID: 25987705
Source
Medline
License
Unknown

Abstract

A partial-thickness epidermal explant model was colonized with green fluorescent protein (GFP)-expressing Staphylococcus aureus, and the pattern of S. aureus biofilm growth was characterized using electron and confocal laser scanning microscopy. The oxygen concentration in explants was quantified using microelectrodes. The relative effective diffusivity and porosity of the epidermis were determined using magnetic resonance imaging, while hydrogen peroxide (H2O2) concentration in explant media was measured by using microelectrodes. Secreted proteins were identified and quantified using elevated-energy mass spectrometry (MS(E)). S. aureus biofilm grows predominantly in lipid-rich areas around hair follicles and associated skin folds. Dissolved oxygen was selectively depleted (2- to 3-fold) in these locations, but the relative effective diffusivity and porosity did not change between colonized and control epidermis. Histological analysis revealed keratinocyte damage across all the layers of colonized epidermis after 4 days of culture. The colonized explants released significantly (P < 0.01) more antioxidant proteins of both epidermal and S. aureus origin, consistent with elevated H2O2 concentrations found in the media from the colonized explants (P< 0.001). Caspase-14 was also elevated significantly in the media from the colonized explants. While H2O2 induces primary keratinocyte differentiation, caspase-14 is required for terminal keratinocyte differentiation and desquamation. These results are consistent with a localized biological impact from S. aureus in response to colonization of the skin surface.

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