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Intracoronary delivery of DNAzymes targeting human EGR‐1 reduces infarct size following myocardial ischaemia reperfusion
Author(s) -
Bhindi Ravinay,
Fahmy Roger G,
McMahon Aisling C,
Khachigian Levon M,
Lowe Harry C
Publication year - 2012
Publication title -
the journal of pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.964
H-Index - 184
eISSN - 1096-9896
pISSN - 0022-3417
DOI - 10.1002/path.2991
Subject(s) - myocardial infarction , medicine , deoxyribozyme , cardiology , reperfusion injury , ischemia , in vivo , cardiac function curve , pharmacology , chemistry , biology , heart failure , dna , biochemistry , microbiology and biotechnology
Despite improvements in treatment, myocardial infarction (MI) remains an important cause of morbidity and mortality. Inflammation arising from ischaemic and reperfusion injury is a key mechanism which underpins myocardial damage and impairment of cardiac function. Early growth response‐1 (Egr‐1) is an early immediate gene and a master regulator that has been implicated in the pathogenesis of ischaemia‐reperfusion (IR) injury. This study sought to examine the effect of selective inhibition of Egr‐1 using catalytic deoxyribonucleic acid molecules (DNAzymes, DZs) delivered via the clinically relevant coronary route in a large animal model of myocardial IR. It was hypothesized that Egr‐1 inhibition with intracoronary DZ would reduce infarction size by modulating its downstream effector molecules. Egr‐1 DZs inhibited the adherence of THP‐1 monocytes to IL‐1β‐activated endothelial cells in vitro and retained its catalytic activity up to 225 min after in vivo administration. In a porcine model of myocardial IR (45 min ischaemia/3 h reperfusion), DZ was taken up in the cytoplasm and nuclei of cardiomyocytes and endothelial cells in the myocardium after intracoronary delivery. Egr‐1 DZs reduced infarct size and improved cardiac functional recovery following intracoronary delivery at the initiation of IR in this large animal model of MI. This was associated with inhibition of pro‐inflammatory Egr‐1 and ICAM‐1 expression, and the reduced expression of TNF‐α, PAI‐1, TF, and myocardial MPO activity in tissue derived from the border zone of the infarct. Taken together, these data suggest that strategies targeting Egr‐1 via the intracoronary route after IR injury in pigs have potential therapeutic implications in human MI. Copyright © 2012 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd.