Abstract:
BACKGROUND:Staphylococcus aureus (S. aureus) is frequently detected in the skin of patients with atopic dermatitis (AD), and involved in the flare of AD. There are some evidence-specific strains of S. aureus affect the severity of AD. However, the mechanism of predominant colonization and the aggravation of dermatitis by certain strains of S. aureus in the patients with AD are still unknown. OBJECTIVE:To reveal the characteristics of S. aureus from patients with AD (S. aureus-AD), we analyzed the interaction of S. aureus-AD and keratinocytes in comparison with those of S. aureus laboratory strains (S. aureus-stand.). METHODS:We stimulated HaCaT cells, keratinocyte cell line, and human epidermal keratinocytes by heat-killed S. aureus strains, then evaluated immune response of keratinocytes by ELISA, immunofluorescence staining, and flow cytometry. RESULTS:Upon incubation with keratinocytes, three out of four strains of heat-killed S. aureus-AD were strongly agglutinated inside the cytoplasm. In the cells, they are located in lysosomes and promoted the secretion of interleukin-1α (IL-1α). These reactions were not observed by any of four strains of S. aureus-stand. and S. epidermidis and were abolished by the treatment of S. aureus with proteinase K. Moreover, the IL-1α secretion was diminished by the inhibition of Toll-like receptor 9 (TLR9). CONCLUSION:S. aureus-AD accumulates in lysosome of keratinocytes by means of bacterial cell wall proteins and induces IL-1α via TLR9.
journal_name
Allergyjournal_title
Allergyauthors
Moriwaki M,Iwamoto K,Niitsu Y,Matsushima A,Yanase Y,Hisatsune J,Sugai M,Hide Mdoi
10.1111/all.13622subject
Has Abstractpub_date
2019-03-01 00:00:00pages
560-571issue
3eissn
0105-4538issn
1398-9995journal_volume
74pub_type
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