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2016 ; 6
(ä): 36207
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MicroRNA-126 overexpression rescues diabetes-induced impairment in efferocytosis
of apoptotic cardiomyocytes
#MMPMID27827458
Suresh Babu S
; Thandavarayan RA
; Joladarashi D
; Jeyabal P
; Krishnamurthy S
; Bhimaraj A
; Youker KA
; Krishnamurthy P
Sci Rep
2016[Nov]; 6
(ä): 36207
PMID27827458
show ga
Efferocytosis, a process of clearance of apoptotic cells by phagocytes, is
essential for successful resolution of inflammation and maintenance of tissue
homeostasis. Diabetes compromises the function of macrophages leading to adverse
inflammatory response during wound healing, myocardial injury, atherosclerosis
and autoimmune disorders. However, the effect of diabetes on macrophage-mediated
efferocytosis of apoptotic cardiomyocytes (ACM) and the molecular mechanisms
involved are not understood so far. In the present study we found that invitro
efferocytosis of ACM was impaired in macrophages from db/db (diabetic) mice.
Macrophages exposed to high glucose (HG) decreases microRNA-126 (miR-126)
expression with a corresponding increase in ADAM9 expression. Dual-luciferase
reporter assay confirms that ADAM9 3'UTR contains miR-126 target site. ADAM9
inhibition reduces HG-induced proteolytic cleavage of Mer tyrosine receptor
kinase (MerTK, a proto-oncogene that plays a critical role in phagocytosis),
resulting in shedding of soluble-Mer (sMER) and loss of MERTK function.
Over-expression of miR-126 attenuates HG-induced impairment of efferocytosis.
Furthermore, human diabetic hearts show lower miR-126 expression with a
corresponding increase in ADAM9 expression vs. normal counterparts. These data
suggests that diabetes impairs efferocytosis of ACM and that strategies to
enhance efferocytosis might attenuate diabetes-induced impairment in inflammation
resolution and cardiac repair after injury.