Background
Myostatin inhibits the development of skeletal muscle and regulates the proliferation
of skeletal muscle fibroblasts. However, the role of myostatin in regulating cardiac
muscle or myofibroblasts, specifically in acute myocardial infarction (MI), is less
clear. This study sought to determine whether absence of myostatin altered left ventricular
function post-MI.
Methods
Myostatin-null mice (Mstn−/−) and wild-type (WT) mice underwent ligation of the left anterior descending artery
to induce MI. Left ventricular function was measured at baseline, days 1 and 28 post-MI.
Immunohistochemistry and immunofluorescence were obtained at day 28 for cellular proliferation,
collagen deposition, and myofibroblastic activity.
Results
Whilst left ventricular function at baseline and size of infarct were similar, significant
differences in favour of Mstn−/− compared to WT mice post-MI include a greater recovery of ejection fraction (61.8 ± 1.1% vs 57.1 ± 2.3%, p< 0.01), less collagen deposition (41.9 ± 2.8% vs 54.7 ± 3.4%, p< 0.05), and lower mortality (0 vs. 20%, p< 0.05). There was no difference in the number of BrdU positive cells, percentage of
apoptotic cardiomyocytes, or size of cardiomyocytes post-MI between WT and Mstn−/− mice.
Conclusions
Absence of myostatin potentially protects the function of the heart post-MI with improved
survival, possibly by limiting extent of fibrosis.
Keywords
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Article info
Publication history
Published online: June 15, 2017
Accepted:
May 24,
2017
Received in revised form:
May 20,
2017
Received:
March 27,
2017
Identification
Copyright
© 2017 Australian and New Zealand Society of Cardiac and Thoracic Surgeons (ANZSCTS) and the Cardiac Society of Australia and New Zealand (CSANZ). Published by Elsevier B.V. All rights reserved.
