Infection mechanism of biofilm-forming Staphylococcus aureus on indwelling foreign materials in mice.

Abstract:

:Indwelling foreign-body infections are a critical medical problem, especially in immunocompromised patients. To examine the pathogenicity of biofilm-forming bacteria settling on foreign materials, mice implanted with plastic discs were infected with Staphylococcus aureus. After opening a wide subcutaneous pocket on the dorsal side of mice with or without temporal leukocytopenia, a plastic sheet was placed in the left subcutaneous space; subsequently, bacteria in a planktonic state were dispersed over the subcutaneous space. Bacterial numbers were examined 7 days after inoculation. In subcutaneous tissue on the right, S. aureus was found only in leukocytopenic mice. Meanwhile, bacteria were detected on the plastic and neighbouring tissue in both leukocytopenic and normal mice; however, colony-forming analysis indicated that leukocytopenic mice possessed significantly more bacteria. Tissue reaction against bacteria was pathologically examined. Invading S. aureus induced severe inflammation. In transient leukocytopenic mice, bacterial microcolonies formed on the plastic as well as in the developed necrotic tissue - both of which were shielded from inflammatory cell infiltration - result in bacteraemia. These results indicate that biofilm-forming S. aureus settling on indwelling foreign material are tolerant against host immunity and assault neighbouring tissue, which may lead to chronic wound infection.

journal_name

Int Wound J

authors

Makino T,Jimi S,Oyama T,Nakano Y,Hamamoto K,Mamishin K,Yahiro T,Hara S,Takata T,Ohjimi H

doi

10.1111/iwj.12061

subject

Has Abstract

pub_date

2015-04-01 00:00:00

pages

122-31

issue

2

eissn

1742-4801

issn

1742-481X

journal_volume

12

pub_type

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