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Blood. 2013 Jan 17;121(3):510-8. doi: 10.1182/blood-2012-05-431114. Epub 2012 Nov 8.

Antibacterial effect of microvesicles released from human neutrophilic granulocytes.

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1
Department of Physiology, Semmelweis University, Budapest, Hungary.

Abstract

Cell-derived vesicles represent a recently discovered mechanism for intercellular communication. We investigated their potential role in interaction of microbes with host organisms. We provide evidence that different stimuli induced isolated neutrophilic granulocytes to release microvesicles with different biologic properties. Only opsonized particles initiated the formation of microvesicles that were able to impair bacterial growth. The antibacterial effect of neutrophil-derived microvesicles was independent of production of toxic oxygen metabolites and opsonization or engulfment of the microbes, but depended on β(2) integrin function, continuous actin remodeling, and on the glucose supply. Neutrophil-derived microvesicles were detected in the serum of healthy donors, and their number was significantly increased in the serum of bacteremic patients. We propose a new extracellular mechanism to restrict bacterial growth and dissemination.

PMID:
23144171
PMCID:
PMC3548170
DOI:
10.1182/blood-2012-05-431114
[Indexed for MEDLINE]
Free PMC Article
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