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2015 ; 12
(5
): 615-24
Nephropedia Template TP
gab.com Text
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English Wikipedia
FAM19A4 is a novel cytokine ligand of formyl peptide receptor 1 (FPR1) and is
able to promote the migration and phagocytosis of macrophages
#MMPMID25109685
Wang W
; Li T
; Wang X
; Yuan W
; Cheng Y
; Zhang H
; Xu E
; Zhang Y
; Shi S
; Ma D
; Han W
Cell Mol Immunol
2015[Sep]; 12
(5
): 615-24
PMID25109685
show ga
FAM19A4 is an abbreviation for family with sequence similarity 19 (chemokine (C-C
motif)-like) member A4, which is a secretory protein expressed in low levels in
normal tissues. The biological functions of FAM19A4 remain to be determined, and
its potential receptor(s) is unclarified. In this study, we demonstrated that
FAM19A4 was a classical secretory protein and we verified for the first time that
its mature protein is composed of 95 amino acids. We found that the expression of
this novel cytokine was upregulated in lipopolysaccharide (LPS)-stimulated
monocytes and macrophages and was typically in polarized M1. FAM19A4 shows
chemotactic activities on macrophages and enhances the macrophage phagocytosis of
zymosan both in vitro and in vivo with noticeable increases of the
phosphorylation of protein kinase B (Akt). FAM19A4 can also increase the release
of reactive oxygen species (ROS) upon zymosan stimulation. Furthermore, based on
receptor internalization, radio ligand binding assays and receptor blockage, we
demonstrated for the first time that FAM19A4 is a novel ligand of formyl peptide
receptor 1 (FPR1). The above data indicate that upon inflammatory stimulation,
monocyte/macrophage-derived FAM19A4 may play a crucial role in the migration and
activation of macrophages during pathogenic infections.