Display Settings:

Format

Send to:

Choose Destination
See comment in PubMed Commons below
FEMS Immunol Med Microbiol. 2012 Jun;65(1):78-83. doi: 10.1111/j.1574-695X.2012.00945.x. Epub 2012 Mar 20.

Human platelets efficiently kill IgG-opsonized E. coli.

Author information

  • 1Department of Medical Microbiology & Immunology, University of Toledo College of Medicine, Toledo, OH 43614, USA.

Abstract

Platelets are known contributors of hemostasis but have recently been shown to be important in inflammation and infectious diseases. Moreover, thrombocytopenia is often observed in patients with sepsis. We previously reported that platelets actively phagocytosed IgG-coated latex beads. In this study, the capacity of human platelets to participate in host defense against bacterial infections was determined by assessing their ability to kill Escherichia coli. Washed human platelets were incubated with unopsonized or IgG-opsonized E. coli and evaluated for binding and killing of E. coli. We found that although both unopsonized and IgG-opsonized E. coli were associated with platelets, only IgG-opsonized E. coli were efficiently killed unless platelets were activated by a potent agonist. The bactericidal activity was dependent on FcγRIIA, was sensitive to cytochalasin D, but was not due to reactive oxygen metabolites. These data suggest that platelets may play an important role in protection against infection.

© 2012 Federation of European Microbiological Societies. Published by Blackwell Publishing Ltd. All rights reserved.

PMID:
22340259
[PubMed - indexed for MEDLINE]
PMCID:
PMC3342444
Free PMC Article
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Icon for PubMed Central
    Loading ...
    Write to the Help Desk