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2018 ; 9
(ä): 644
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A 17-kDa Fragment of Lactoferrin Associates With the Termination of Inflammation
and Peptides Within Promote Resolution
#MMPMID29643857
Lutaty A
; Soboh S
; Schif-Zuck S
; Zeituni-Timor O
; Rostoker R
; Podolska MJ
; Schauer C
; Herrmann M
; Muñoz LE
; Ariel A
Front Immunol
2018[]; 9
(ä): 644
PMID29643857
show ga
During the resolution of inflammation, macrophages engulf apoptotic
polymorphonuclear cells (PMN) and can accumulate large numbers of their corpses.
Here, we report that resolution phase macrophages acquire the neutrophil-derived
glycoprotein lactoferrin (Lf) and fragments thereof in vivo and ex vivo. During
the onset and resolving phases of inflammation in murine peritonitis and bovine
mastitis, Lf fragments of 15 and 17?kDa occurred in various body fluids, and the
murine fragmentation, accumulation, and release were mediated initially by
neutrophils and later by efferocytic macrophages. The 17-kDa fragment contained
two bioactive tripeptides, FKD and FKE that promoted resolution phase macrophage
conversion to a pro-resolving phenotype. This resulted in a reduction in
peritoneal macrophage numbers and an increase in the CD11b(low) subset of these
cells. Moreover, FKE, but not FKD, peptides enhanced efferocytosis of apoptotic
PMN, reduced TNF? and interleukin (IL)-6, and increased IL-10 secretion by
lipopolysaccharide-stimulated macrophages ex vivo. In addition, FKE promoted
neutrophil-mediated resolution at high concentrations (100?µM) by enhancing the
formation of cytokine-scavenging aggregated NETs (tophi) at a low cellular
density. Thus, PMN Lf is processed, acquired, and "recycled" by neutrophils and
macrophages during inflammation resolution to generate fragments and peptides
with paramount pro-resolving activities.