Clinical isolates of Enterococcus faecalis aggregate human platelets.

Rasmussen, MagnusLund University,Lunds universitet,Infektionsmedicin,Sektion III,Institutionen för kliniska vetenskaper, Lund,Medicinska fakulteten,Infection Medicine (BMC),Section III,Department of Clinical Sciences, Lund,Faculty of Medicine (author)

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 faecalis, 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 11minutes 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 FcRgammaIIa 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.

Johansson, DanielLund University,Lunds universitet,Infektionsmedicin,Sektion III,Institutionen för kliniska vetenskaper, Lund,Medicinska fakulteten,Infection Medicine (BMC),Section III,Department of Clinical Sciences, Lund,Faculty of Medicine(Swepub:lu)med-dja (author)
Karlsson Söbirk, SaraLund University,Lunds universitet,Infektionsmedicin,Sektion III,Institutionen för kliniska vetenskaper, Lund,Medicinska fakulteten,Infection Medicine (BMC),Section III,Department of Clinical Sciences, Lund,Faculty of Medicine(Swepub:lu)med-sko (author)
Mörgelin, MatthiasLund University,Lunds universitet,Infektionsmedicin,Sektion III,Institutionen för kliniska vetenskaper, Lund,Medicinska fakulteten,Infection Medicine (BMC),Section III,Department of Clinical Sciences, Lund,Faculty of Medicine(Swepub:lu)medk-mmn (author)
Shannon, OonaghLund University,Lunds universitet,Infektionsmedicin,Sektion III,Institutionen för kliniska vetenskaper, Lund,Medicinska fakulteten,Immunmodulerande effekter av blodplättar vid inflammation och infektion,Forskargrupper vid Lunds universitet,Infection Medicine (BMC),Section III,Department of Clinical Sciences, Lund,Faculty of Medicine,Immunomodulatory effects of platelets during inflammation and infection,Lund University Research Groups(Swepub:lu)med-osn (author)
InfektionsmedicinSektion III (creator_code:org_t)

By the author/editor: Rasmussen, Magnu ...; Johansson, Danie ...; Karlsson Söbirk, ...; Mörgelin, Matthi ...; Shannon, Oonagh

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MEDICAL AND HEALTH SCIENCES: MEDICAL AND HEAL ...; and Clinical Medicin ...; and Infectious Medic ...

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