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2018 ; 38
(7
): 1616-1631
Nephropedia Template TP
gab.com Text
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English Wikipedia
Deficiency of FAM3D (Family With Sequence Similarity 3, Member D), A Novel
Chemokine, Attenuates Neutrophil Recruitment and Ameliorates Abdominal Aortic
Aneurysm Development
#MMPMID29853563
He L
; Fu Y
; Deng J
; Shen Y
; Wang Y
; Yu F
; Xie N
; Chen Z
; Hong T
; Peng X
; Li Q
; Zhou J
; Han J
; Wang Y
; Xi J
; Kong W
Arterioscler Thromb Vasc Biol
2018[Jul]; 38
(7
): 1616-1631
PMID29853563
show ga
OBJECTIVE: Chemokine-mediated neutrophil recruitment contributes to the
pathogenesis of abdominal aortic aneurysm (AAA) and may serve as a promising
therapeutic target. FAM3D (family with sequence similarity 3, member D) is a
recently identified novel chemokine. Here, we aimed to explore the role of FAM3D
in neutrophil recruitment and AAA development. APPROACH AND RESULTS: FAM3D was
markedly upregulated in human AAA tissues, as well as both elastase- and
CaPO(4)-induced mouse aneurysmal aortas. FAM3D deficiency significantly
attenuated the development of AAA in both mouse models. Flow cytometry analysis
indicated that FAM3D(-/-) mice exhibited decreased neutrophil infiltration in the
aorta during the early stage of AAA formation compared with their wild-type
littermates. Moreover, application of FAM3D-neutralizing antibody 6D7 through
intraperitoneal injection markedly ameliorated elastase-induced AAA formation and
neutrophil infiltration. Further, in vitro coculture experiments with
FAM3D-neutralizing antibody 6D7 and in vivo intravital microscopic analysis
indicated that endothelial cell-derived FAM3D induced neutrophil recruitment.
Mechanistically, FAM3D upregulated and activated Mac-1 (macrophage-1 antigen) in
neutrophils, whereas inhibition of FPR1 (formyl peptide receptor 1) or FPR2
significantly blocked FAM3D-induced Mac-1 activation, indicating that the effect
of FAM3D was dependent on both FPRs. Moreover, specific inhibitors of FPR
signaling related to Gi protein or ?-arrestin inhibited FAM3D-activated Mac-1 in
vitro, whereas FAM3D deficiency decreased the activation of both FPR-Gi protein
and ?-arrestin signaling in neutrophils in vivo. CONCLUSIONS: FAM3D, as a dual
agonist of FPR1 and FPR2, induced Mac-1-mediated neutrophil recruitment and
aggravated AAA development through FPR-related Gi protein and ?-arrestin
signaling.
|*Neutrophil Infiltration
[MESH]
|Animals
[MESH]
|Aorta, Abdominal/*metabolism/pathology
[MESH]
|Aortic Aneurysm, Abdominal/genetics/metabolism/pathology/*prevention & control
[MESH]