Killing by neutrophil extracellular traps: fact or folklore?

R Menegazzi, E Decleva, P Dri - Blood, The Journal of the …, 2012 - ashpublications.org
R Menegazzi, E Decleva, P Dri
Blood, The Journal of the American Society of Hematology, 2012ashpublications.org
Neutrophil extracellular traps (NETs) are DNA structures released by dying neutrophils and
claimed to constitute a new microbicidal mechanism. Killing by NET-forming cells is ascribed
to these structures because it is prevented by preincubation with DNase, which has been
shown to dismantle NETs, before addition of the target microorganisms. Curiously, the
possibility that the microorganisms ensnared in NETs are alive has not been considered.
Using Staphylococcus aureus and Candida albicans blastospores, we demonstrate that the …
Abstract
Neutrophil extracellular traps (NETs) are DNA structures released by dying neutrophils and claimed to constitute a new microbicidal mechanism. Killing by NET-forming cells is ascribed to these structures because it is prevented by preincubation with DNase, which has been shown to dismantle NETs, before addition of the target microorganisms. Curiously, the possibility that the microorganisms ensnared in NETs are alive has not been considered. Using Staphylococcus aureus and Candida albicans blastospores, we demonstrate that the microorganisms captured by NETs and thought to be killed are alive because they are released and recovered in cell medium by incubation with DNase. It is concluded that NETs entrap but do not kill microbes.
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