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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Mol+Cell+Cardiol
2014 ; 77
(ä): 86-101
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MMI-0100 inhibits cardiac fibrosis in myocardial infarction by direct actions on
cardiomyocytes and fibroblasts via MK2 inhibition
#MMPMID25257914
Xu L
; Yates CC
; Lockyer P
; Xie L
; Bevilacqua A
; He J
; Lander C
; Patterson C
; Willis M
J Mol Cell Cardiol
2014[Dec]; 77
(ä): 86-101
PMID25257914
show ga
The cell-permeant peptide inhibitor of MAPKAP kinase 2 (MK2), MMI-0100, inhibits
MK2 and downstream fibrosis and inflammation. Recent studies have demonstrated
that MMI-0100 reduces intimal hyperplasia in a mouse vein graft model, pulmonary
fibrosis in a murine bleomycin-induced model and development of adhesions in
conjunction with abdominal surgery. MK2 is critical to the pathogenesis of
ischemic heart injury as MK2(-/-) mice are resistant to ischemic remodeling.
Therefore, we tested the hypothesis that inhibiting MK2 with MMI-0100 would
protect the heart after acute myocardial infarction (AMI) in vivo. AMI was
induced by placing a permanent LAD coronary ligation. When MMI-0100 peptide was
given 30 min after permanent LAD coronary artery ligation, the resulting fibrosis
was reduced/prevented ~50% at a 2 week time point, with a corresponding
improvement in cardiac function and decrease in left ventricular dilation. In
cultured cardiomyocytes and fibroblasts, MMI-0100 inhibited MK2 to reduce
cardiomyocyte caspase 3/7 activity, while enhancing primary cardiac fibroblast
caspase 3/7 activity, which may explain MMI-0100's salvage of cardiac function
and anti-fibrotic effects in vivo. These findings suggest that therapeutic
inhibition of MK2 after acute MI, using rationally-designed cell-permeant
peptides, inhibits cardiac fibrosis and maintains cardiac function by mechanisms
that involve inhibiting cardiomyocyte apoptosis, while enhancing primary cardiac
fibroblast cell death.
|Animals
[MESH]
|Apoptosis
[MESH]
|Cell Line
[MESH]
|Fibroblasts/*drug effects/enzymology
[MESH]
|Intracellular Signaling Peptides and Proteins/*antagonists &
inhibitors/metabolism
[MESH]