Induction of genes mediating interferon-dependent extracellular trap formation during neutrophil differentiation.
Interferons (IFNs) are cytokines that possess potent anti-viral and immunoregulatory activities. In contrast, their potential role(s) in anti-bacterial defense and neutrophil activation mechanisms is less well explored. By comparing gene expression patterns between immature and mature human neutrophils, we obtained evidence that intracellular proteases and other anti-bacterial proteins are produced at earlier stages of maturation, whereas the genes for receptors and signaling molecules required for the release of these effector molecules are preferentially induced during terminal differentiation. For instance, mature neutrophils strongly expressed genes that increase their responses to type I and type II IFNs. Interestingly, granulocyte/macrophage colony-stimulating factor was identified as a repressor of IFN signaling components and consequently of IFN-responsive genes. Both IFN-alpha and IFN-gamma induced strong tyrosine phosphorylation of STAT1 in mature but not in immature neutrophils. Functional in vitro studies suggested that IFNs act as priming factors on mature neutrophils, allowing the formation of extracellular traps upon subsequent stimulation with complement factor 5a (C5a). In contrast, both IFN-alpha and IFN-gamma had only little capacity to prime immature cells in this system. Moreover, both IFNs did not have significant anti-proliferative effects on immature neutrophils. These data contribute to our understanding regarding changes of gene expression during neutrophil differentiation and IFN-mediated anti-bacterial defense mechanisms.
Department of Pharmacology, University of Bern, CH-3010, Switzerland.
Sibylla
S
Martinelli
Mirjana
M
Urosevic
Arezoo
A
Daryadel
Patrick Antony
PA
Oberholzer
Christa
C
Baumann
Martin F
MF
Fey
Reinhard
R
Dummer
Hans-Uwe
HU
Simon
Shida
S
Yousefi
D001483:Base Sequence; D002454:Cell Differentiation / Q000187:drug effects / Q000235:genetics*; D016000:Cluster Analysis; D017931:DNA Primers; D005110:Extracellular Space / Q000502:physiology*; D005786:Gene Expression Regulation / Q000187:drug effects / Q000276:immunology; D006801:Humans; D016898:Interferon-alpha / Q000494:pharmacology*; D007372:Interferons / Q000502:physiology*; D009504:Neutrophils / Q000166:cytology* / Q000187:drug effects
D017931:DNA Primers; D016898:Interferon-alpha; D007372:Interferons