Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/120628
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Type: Journal article
Title: Differential response to injury in fetal and adolescent sheep hearts in the immediate post in the immediate post-myocardial myocardial myocardial infarction period
Author: Lock, M.
Darby, J.
Soo, J.
Brooks, D.
Perumal, S.
Selvanayagam, J.
Seed, M.
MacGowan, C.
Porrello, E.
Tellam, R.
Morrison, J.
Citation: Frontiers in Physiology, 2019; 10(MAR):208-1-208-24
Publisher: Frontiers Media
Issue Date: 2019
ISSN: 1664-042X
1664-042X
Statement of
Responsibility: 
Mitchell C. Lock, Jack R. T. Darby, Jia Yin Soo, Doug A. Brooks, Sunthara Rajan Perumal, Joseph B. Selvanayagam, Mike Seed, Christopher K. Macgowan, Enzo R. Porrello, Ross L. Tellam and Janna L. Morrison
Abstract: Aim: Characterizing the response to myocardial infarction (MI) in the regenerative sheep fetus heart compared to the post-natal non-regenerative adolescent heart may reveal key morphological and molecular differences that equate to the response to MI in humans. We hypothesized that the immediate response to injury in (a) infarct compared with sham, and (b) infarct, border, and remote tissue, in the fetal sheep heart would be fundamentally different to the adolescent, allowing for repair after damage. Methods: We used a sheep model of MI induced by ligating the left anterior descending coronary artery. Surgery was performed on fetuses (105 days) and adolescent sheep (6 months). Sheep were randomly separated into MI (n = 5) or Sham (n = 5) surgery groups at both ages. We used magnetic resonance imaging (MRI), histological/immunohistochemical staining, and qRT-PCR to assess the morphological and molecular differences between the different age groups in response to infarction. Results: Magnetic resonance imaging showed no difference in fetuses for key functional parameters; however there was a significant decrease in left ventricular ejection fraction and cardiac output in the adolescent sheep heart at 3 days post-infarction. There was no significant difference in functional parameters between MRI sessions at Day 0 and Day 3 after surgery. Expression of genes involved in glucose transport and fatty acid metabolism, inflammatory cytokines as well as growth factors and cell cycle regulators remained largely unchanged in the infarcted compared to sham ventricular tissue in the fetus, but were significantly dysregulated in the adolescent sheep. Different cardiac tissue region-specific gene expression profiles were observed between the fetal and adolescent sheep. Conclusion: Fetuses demonstrated a resistance to cardiac damage not observed in the adolescent animals. The manipulation of specific gene expression profiles to a fetal-like state may provide a therapeutic strategy to treat patients following an infarction.
Keywords: cardiac; fetus; myocardial infarction; proliferation; repair; sheep
Rights: © 2019 Lock, Darby, Soo, Brooks, Perumal, Selvanayagam, Seed, Macgowan, Porrello, Tellam and Morrison. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
RMID: 0030120521
DOI: 10.3389/fphys.2019.00208
Grant ID: http://purl.org/au-research/grants/nhmrc/1066916
http://purl.org/au-research/grants/nhmrc/1108127
http://purl.org/au-research/grants/arc/FT170100431
Appears in Collections:Medicine publications

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