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Priming of Human Neutrophils Is Necessary for Their Activation by Extracellular DNA

A. S. Prikhodko1, M. V. Vitushkina2, L. A. Zinovkina1, E. N. Popova3, and R. A. Zinovkin2,3*

1Lomonosov Moscow State University, Faculty of Bioengineering and Bioinformatics, 119991 Moscow, Russia

2Lomonosov Moscow State University, Faculty of Biology, 119991 Moscow, Russia; E-mail: roman.zinovkin@gmail.com

3Lomonosov Moscow State University, Belozersky Institute of Physico-Chemical Biology, 119991 Moscow, Russia

* To whom correspondence should be addressed.

Received February 19, 2016; Revision received March 13, 2016
Extracellular plasma DNA is thought to act as a damage-associated molecular pattern causing activation of immune cells. However, purified preparations of mitochondrial and nuclear DNA were unable to induce neutrophil activation in vitro. Thus, we examined whether granulocyte-macrophage colony-stimulating factor (GM-CSF) acting as a neutrophil priming agent can promote the activation of neutrophils by different types of extracellular DNA. GM-CSF pretreatment greatly increased p38 MAPK phosphorylation and promoted CD11b/CD66b expression in human neutrophils treated with mitochondrial and, to a lesser extent, with nuclear DNA. Our experiments clearly indicate that GM-CSF-induced priming of human neutrophils is necessary for their subsequent activation by extracellular DNA.
KEY WORDS: neutrophil activation, GM-CSF, extracellular DNA, nuclear DNA, mitochondrial DNA

DOI: 10.1134/S0006297916060079