Disruption of protein homeostasis causes cardiomyocyte (CM) dysfunction and death, and is increasingly recognized to play a causal role in human cardiomyopathies and heart failure. Ubiquitin (Ub) and Ub-like proteins modify diverse protein substrates and expand the functional diversity of the proteome. An extensive body of work has suggested the exciting potential of targeting these protein modifiers to combat cardiac disease. However, the functional role of NEDD8, a novel Ub-like protein, remains poorly understood in the heart. Neddylation covalently attaches NEDD8 to target proteins via NEDD8-specific E1-E2-E3 enzymes. Over the previous funding cycle, we discovered that neddylation is dysregulated in the failing hearts of patients and animal models of cardiac diseases. We further demonstrated that a balance between neddylation and deneddylation is essential to cardiac homeostasis, as evidenced by the fact that perturbation of deneddylation precipitated the heart to cardiomyopathy and heart failure, whereas blockade of neddylation in the developing heart caused ventricular noncompaction and perinatal lethality. Although it is becoming apparent that neddylation is essential for organ development, its functional importance in fully differentiated, postmitotic tissues is not clear. This grant addresses a novel linkage between neddylation and mitochondrial integrity in adult CMs. Pharmacological inhibition of neddylation promoted mitochondrial fusion, disrupted mitochondrial membrane potential and impaired mitochondrial respiration in neonatal CMs. Deletion of NAE1 (a regulatory subunit of the NEDD8 E1 enzyme) in adult CMs also resulted in mitochondrial elongation and impaired mitochondrial quality. Mechanistically, neddylation modifies various cellular proteins to regulate mitochondrial dynamics and mitophagy. Conditional knockout (KO) of NAE1 in adult mouse hearts resulted in dilated cardiomyopathy, heart failure, and ultimately premature death. In clinical trials, administration of the neddylation inhibitor MLN4924 to cancer patients elicited severe cardiotoxicity. These compelling published and preliminary data form the basis of our central hypothesis that neddylation is required for normal heart function through regulation of mitochondrial dynamics and mitophagy. Using the newly generated inducible NAE1KO mice and MLN4924, Aim 1 will establish the significance of neddylation in the adult healthy and failing heart and determine the impact of neddylation on mitochondrial function.
Aim 2 will dissect the molecular basis by which neddylation controls mitochondrial dynamics and will test if normalization of mitochondrial morphology benefits the NAE1KO heart.
Aim 3 will elucidate novel Parkin-independent mechanisms by which neddylation regulates mitophagy and test whether restoration of neddylation attenuates cardiac dysfunction in NAE1KO mice. This study will be the first to establish an unappreciated role for neddylation in regulating mitochondrial fitness and function in adult CMs. Moreover, it will provide novel insight into the potential cardiotoxicity of neddylation inhibitors that are currently being applied in cancer therapy, thus advancing the field of cardio-oncology.

Public Health Relevance

Heart disease remains a major health problem worldwide. This study will address the importance of a novel protein post-translational modification in the maintenance of heart function under resting and stressed conditions, and will investigate how this modification regulates the function of mitochondria, whose dysfunction is implicated in cardiac and other diseases. This research will also produce broadly applicable, basic biological insights.

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Research Project (R01)
Project #
2R01HL124248-06A1
Application #
9886742
Study Section
Myocardial Ischemia and Metabolism Study Section (MIM)
Program Officer
Wong, Renee P
Project Start
2014-08-01
Project End
2024-11-30
Budget Start
2019-12-01
Budget End
2020-11-30
Support Year
6
Fiscal Year
2020
Total Cost
Indirect Cost
Name
Augusta University
Department
Pharmacology
Type
Schools of Medicine
DUNS #
City
Augusta
State
GA
Country
United States
Zip Code
30912
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