Journal
MICROBES AND INFECTION
Volume 12, Issue 4, Pages 295-301Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micinf.2010.01.005
Keywords
Platelet activation; Infective endocarditis; Enterococcus faecalis
Categories
Funding
- Swedish Government Funds for Clinical Research (ALF)
- Swedish Research Council
- Osterlund and Crafoord foundations
Ask authors/readers for more resources
Many endocarditis pathogens activate human platelets and this has been proposed to contribute to virulence Here we report for the first time that many clinical isolates of Enterococcus faecal's, a common pathogen in infective endocarditis, aggregate human platelets 84 isolates from human blood and urine were screened for their ability to aggregate platelets from four different donors Platelet aggregation occurred for between 11 and 65% of isolates depending on the donor In one donor, a significantly larger proportion of isolates from blood than from urine caused platelet aggregation Median time to aggregation was 11 min and had a tendency to be shorter for blood isolates as compared to urine isolates Immunoglobulin G (IgG) was shown to be essential in mediating activation and aggregation Platelet aggregation could be abolished by an IgG-specific proteinase (IdeS), by an antibody blocking FcR gamma lla on platelets, or by preabsorption of plasma with an E faecalis isolate Fibrinogen binding to bacteria or platelets does not contribute to platelet activation or aggregation under our experimental conditions These results indicate that platelet activation and aggregation by E faecalis is dependent on both host and bacterial factors and that it may be involved in the pathogenesis of invasive disease with this organism (C) 2010 Elsevier Masson SAS All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available