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2017 ; 9
(9
): 1244-1262
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Macrophage deficiency of miR-21 promotes apoptosis, plaque necrosis, and vascular
inflammation during atherogenesis
#MMPMID28674080
Canfrán-Duque A
; Rotllan N
; Zhang X
; Fernández-Fuertes M
; Ramírez-Hidalgo C
; Araldi E
; Daimiel L
; Busto R
; Fernández-Hernando C
; Suárez Y
EMBO Mol Med
2017[Sep]; 9
(9
): 1244-1262
PMID28674080
show ga
Atherosclerosis, the major cause of cardiovascular disease, is a chronic
inflammatory disease characterized by the accumulation of lipids and inflammatory
cells in the artery wall. Aberrant expression of microRNAs has been implicated in
the pathophysiological processes underlying the progression of atherosclerosis.
Here, we define the contribution of miR-21 in hematopoietic cells during
atherogenesis. Interestingly, we found that miR-21 is the most abundant miRNA in
macrophages and its absence results in accelerated atherosclerosis, plaque
necrosis, and vascular inflammation. miR-21 expression influences foam cell
formation, sensitivity to ER-stress-induced apoptosis, and phagocytic clearance
capacity. Mechanistically, we discovered that the absence of miR-21 in
macrophages increases the expression of the miR-21 target gene, MKK3, promoting
the induction of p38-CHOP and JNK signaling. Both pathways enhance macrophage
apoptosis and promote the post-translational degradation of ABCG1, a transporter
that regulates cholesterol efflux in macrophages. Altogether, these findings
reveal a major role for hematopoietic miR-21 in atherogenesis.
|*Apoptosis
[MESH]
|ATP Binding Cassette Transporter, Subfamily G, Member 1/genetics/immunology
[MESH]