Abstract
The functional role of TGFβ type I receptor, activin-like kinase (ALK)-1 in post-myocardial infarction (MI) cardiac remodeling is unknown. We hypothesize that reduced ALK1 activity reduces survival and promotes cardiac fibrosis after MI. MI was induced in wild-type (WT), and ALK+/− mice by left coronary ligation. After 14 days ALK1+/− mice had reduced survival with a higher rate of cardiac rupture compared to WT mice. ALK1+/− left ventricles (LVs) had increased volumes at the end of systole and at the end of diastole. After MI ALK1+/− LVs had increased profibrotic SMAD3 signaling, type 1 collagen, and fibrosis as well as increased levels of TGFβ1 co-receptor, endoglin, VEGF, and ALK1 ligands BMP9 and BMP10. ALK1+/− LVs had decreased levels of stromal-derived factor 1α. These data identify the critical role of ALK1 in post-MI survival and cardiac remodeling and implicate ALK1 as a potential therapeutic target to improve survival after MI.
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Abbreviations
- MI:
-
Myocardial infarction
- TGFβ:
-
Transforming growth factor beta
- ALK1:
-
Activin-like kinase 1
- BMP:
-
Bone morphogenetic protein
- LCA:
-
Left coronary artery
- α-SMA:
-
α-smooth muscle actin
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Funding
This work was funded by the National Institute of Health grants R01HL133215 (NKK) and R01HL139785 (NKK).
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Dr. Kapur receives institutional grant support and speaker/consulting honoraria from Abbott, Abiomed, Boston Scientific, LivaNova, Medtronic, MD Start, and Precardia.
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No human studies were carried out for the generation of data in this article.
Clinical Relevance
Post myocardial infarction wound healing process is crucial for the patient’s survival as well as the development of heart disease. The ALK1/BMP9 pathway is an emerging target for the development of novel therapies for both cancers and cardiovascular diseases. Data presented here sheds more light on the role of this pathway in the cardiac wound healing process thus identifying unique molecular targets for future treatments.
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Associate Editor Joost Sluijter oversaw the review of this article
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Bhave, S., Swain, L., Qiao, X. et al. ALK1 Deficiency Impairs the Wound-Healing Process and Increases Mortality in Murine Model of Myocardial Infarction. J. of Cardiovasc. Trans. Res. (2023). https://doi.org/10.1007/s12265-023-10471-w
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DOI: https://doi.org/10.1007/s12265-023-10471-w