1887

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Volume 56, Issue 10

ability of isolates from bacteraemic patients with and without metastatic complications to invade vascular endothelial cells Free

Abstract

Invasion of vascular endothelial cells is thought to be a critical step in the development of metastatic infections in patients with bacteraemia. This study was designed to evaluate the association between the ability to invade endothelial cells and metastatic infection by . Patients with metastatic infection were identified among those with community-acquired bacteraemia in a tertiary referral hospital. Patients with simple bacteraemia caused by over the same period served as the control group. The ability of each clinical isolate to invade endothelial cells was evaluated by counting the number of intracellular organisms 1 h after inoculation onto human umbilical vein endothelial cells . The cytotoxic activity of intracellular was determined 24 h after internalization, and expressed as the percentage of cells killed. The clinical isolates varied in invasiveness and cytotoxicity. The median invasiveness, relative to reference strain ATCC 29213, was 145  % in the cases (=10) [interquartile range (IQR) 103–160] and 153  % (IQR 111–173) in the controls (=11; =0.44). The median cytotoxicity was 59.4  % (IQR 47–68) in the cases and 65.2  % (IQR 50–74) in the controls (=0.44). Differences in the ability of to invade and destroy vascular endothelial cells were not associated with the development of metastatic complications in patients with bacteraemia. This implies that the invasiveness and toxicity of for endothelial cells may not be major determinants of metastatic infection.

  • Received:
  • Accepted:
  • Published Online:
Keyword(s): HUVEC, human umbilical vein endothelial cell and IQR, interquartile range
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2007-10-01
2024-04-19
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In vitro ability of Staphylococcus aureus isolates from bacteraemic patients with and without metastatic complications to invade vascular endothelial cells
J. Med. Microbiol. 56, 1290 (2007); https://doi.org/10.1099/jmm.0.46765-0
/content/journal/jmm/10.1099/jmm.0.46765-0
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