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Localization of Staphylococcus aureus in tissue from the nasal vestibule in healthy carriers

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ABSTRACT

Background: Colonization of the body is an important step in Staphylococcus aureus infection. S. aureus colonizes skin and mucous membranes in humans and several animal species. One important ecological niche of S. aureus is the anterior nares. More than 60% of the S. aureus in the nose are found in vestibulum nasi. Our aim was to describe the localization of S. aureus in nasal tissue from healthy carriers.

Methods: Punch skin biopsies were taken from vestibulum nasi from healthy volunteers (S. aureus carriers and non−/intermittent carriers, n = 39) attending the population-based Tromsø 6 study. The tissue samples were processed as frozen sections before immunostaining with a specific S. aureus antibody, and finally evaluated by a confocal laser-scanning microscope.

Results: Our results suggest that S. aureus colonize both the upper and lower layers of the epidermis within the nasal epithelium of healthy individuals. The number of S. aureus in epidermis was surprisingly low. Intracellular localization of S. aureus in nasal tissue from healthy individuals was also detected.

Conclusions: Knowledge of the exact localization of S. aureus in nasal tissue is important for the understanding of the host responses against S. aureus. Our results may have consequences for the eradication strategy of S. aureus in carriers, and further work can provide us with tools for targeted prevention of S. aureus colonisation and infection.

Electronic supplementary material: The online version of this article (doi:10.1186/s12866-017-0997-3) contains supplementary material, which is available to authorized users.

No MeSH data available.


Representative histological view of epidermis in an S. aureus nasal carrier. Nasal secretion and four stratified cell layers in epidermis are marked. Sections were stained with hematoxylin-eosin, and examined in light microscope
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Fig1: Representative histological view of epidermis in an S. aureus nasal carrier. Nasal secretion and four stratified cell layers in epidermis are marked. Sections were stained with hematoxylin-eosin, and examined in light microscope

Mentions: Biopsies were then obtained from the 39 participants and HE staining and CLSM/immunohistochemistry (IHC) were performed. The cryo-sectioning of nasal tissue showed all layers of epidermis, confirming the quality of the biopsies (Fig. 1).Fig. 1


Localization of Staphylococcus aureus in tissue from the nasal vestibule in healthy carriers
Representative histological view of epidermis in an S. aureus nasal carrier. Nasal secretion and four stratified cell layers in epidermis are marked. Sections were stained with hematoxylin-eosin, and examined in light microscope
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC5382455&req=5

Fig1: Representative histological view of epidermis in an S. aureus nasal carrier. Nasal secretion and four stratified cell layers in epidermis are marked. Sections were stained with hematoxylin-eosin, and examined in light microscope
Mentions: Biopsies were then obtained from the 39 participants and HE staining and CLSM/immunohistochemistry (IHC) were performed. The cryo-sectioning of nasal tissue showed all layers of epidermis, confirming the quality of the biopsies (Fig. 1).Fig. 1

View Article: PubMed Central - PubMed

ABSTRACT

Background: Colonization of the body is an important step in Staphylococcus aureus infection. S. aureus colonizes skin and mucous membranes in humans and several animal species. One important ecological niche of S. aureus is the anterior nares. More than 60% of the S. aureus in the nose are found in vestibulum nasi. Our aim was to describe the localization of S. aureus in nasal tissue from healthy carriers.

Methods: Punch skin biopsies were taken from vestibulum nasi from healthy volunteers (S. aureus carriers and non−/intermittent carriers, n = 39) attending the population-based Tromsø 6 study. The tissue samples were processed as frozen sections before immunostaining with a specific S. aureus antibody, and finally evaluated by a confocal laser-scanning microscope.

Results: Our results suggest that S. aureus colonize both the upper and lower layers of the epidermis within the nasal epithelium of healthy individuals. The number of S. aureus in epidermis was surprisingly low. Intracellular localization of S. aureus in nasal tissue from healthy individuals was also detected.

Conclusions: Knowledge of the exact localization of S. aureus in nasal tissue is important for the understanding of the host responses against S. aureus. Our results may have consequences for the eradication strategy of S. aureus in carriers, and further work can provide us with tools for targeted prevention of S. aureus colonisation and infection.

Electronic supplementary material: The online version of this article (doi:10.1186/s12866-017-0997-3) contains supplementary material, which is available to authorized users.

No MeSH data available.