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2017 ; 16
(5
): 2101-2112
Nephropedia Template TP
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Quantitative Proteomics and Immunohistochemistry Reveal Insights into Cellular
and Molecular Processes in the Infarct Border Zone One Month after Myocardial
Infarction
#MMPMID28347137
Yang L
; Gregorich ZR
; Cai W
; Zhang P
; Young B
; Gu Y
; Zhang J
; Ge Y
J Proteome Res
2017[May]; 16
(5
): 2101-2112
PMID28347137
show ga
Postinfarction remodeling and expansion of the peri-infarct border zone (BZ)
directly correlate with mortality following myocardial infarction (MI); however,
the cellular and molecular mechanisms underlying remodeling processes in the BZ
remain unclear. Herein, we utilized a label-free quantitative proteomics approach
in combination with immunohistochemical analyses to gain a better understanding
of processes contributing to postinfarction remodeling of the peri-infarct BZ in
a swine model of MI with reperfusion. Our analysis uncovered a significant
down-regulation of proteins involved in energy metabolism, indicating impaired
myocardial energetics and possibly mitochondrial dysfunction, in the peri-scar
BZ. An increase in endothelial and vascular smooth muscles cells, as well as
up-regulation of proteins implicated in vascular endothelial growth factor (VEGF)
signaling and marked changes in the expression of extracellular matrix and
subendothelial basement membrane proteins, is indicative of active angiogenesis
in the infarct BZ. A pronounced increase in macrophages in the peri-infarct BZ
was also observed, and proteomic analysis uncovered evidence of persistent
inflammation in this tissue. Additional evidence suggested an increase in
cellular proliferation that, concomitant with increased nestin expression,
indicates potential turnover of endogenous stem cells in the BZ. A marked
up-regulation of pro-apoptotic proteins, as well as the down-regulation of
proteins important for adaptation to mechanical, metabolic, and oxidative stress,
likely contributes to increased apoptosis in the peri-infarct BZ. The cellular
processes and molecular pathways identified herein may have clinical utility for
therapeutic intervention aimed at limiting remodeling and expansion of the BZ
myocardium and preventing the development of heart failure post-MI.