Interstitial fibrosis of the heart contributes to cardiac dysfunction and morbidity associated with heart failure. The specific cellular origins and molecular pathogenesis of cardiac fibrosis are not well defined, but the end state of fibrosis includes increased expression of extracellular matrix (ECM) proteins by interstitial fibroblasts. During heart development, the interstitial fibroblasts arise from epicardial-derived cells (EPDCs) that invade the myocardium, differentiate, and synthesize ECM ofthe fibrous cardiac matrix. There is recent evidence that EPDCs are activated and recapitulate developmental mechanisms in adult cardiac injury and pathologic fibrosis. Wnt/p-catenin signaling is required for epicardial development, but its role in fibroblast cell lineage development or cardiac fibrosis has not been examined. We hypothesize that Wnt/p-catenin signaling promotes normal development of interstitial fibroblasts and also contributes to pathologic interstitial fibrosis in adult cardiovascular disease. Using constructs and disease models developed by Projects 1 and 3, as well as in our own laboratory, the three Specific Aims are designed to test the necessity and sufficiency of the roles played by Wnt/p-catenin fibroblast signaling during development and cardiac disease.
Specific Aim 1 will determine if Wnt/p-catenin signaling promotes interstitial fibroblast lineage differentiation and ECM formation during development in vivo.
Aim 2 will determine if Wnt/p-catenin signaling promotes maladaptive fibrotic disease and if Wnt pathway inhibition is sufficient to prevent the progression of fibrosis and heart failure in adulthood.
Aim 3 will examine the intersection of Wnt/p-catenin and TGFp/Smad2/3 signaling pathways in the induction and progression of cardiac fibrosis. These in vivo mechanistic studies will be used to dissect the molecular contributions of Wnt/p-catenin signaling to cardiac fibroblast lineage, development and the pathogenesis of interstitial fibrosis in cardiovascular disease. The long-term goal of the proposed studies is to identify new therapeutic targets for the treatment and management of maladaptive cardiac fibrosis and subsequent heart failure. 1

Public Health Relevance

Cardiac fibroblasts are a major cell type in the heart but the roles they play in terms of disease development are largely unexplored. We hypothesize that specific signaling processes that are critical for normal development play an important role in defining these cells. We also want to test if these processes are more generally involved irji cardiac disease and heart failure. Definitive proof of these ideas will identify new therapeutic possibilities for the treatment of cardiac disease.

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Research Program Projects (P01)
Project #
2P01HL069779-11
Application #
8460272
Study Section
Heart, Lung, and Blood Initial Review Group (HLBP)
Project Start
Project End
Budget Start
2013-09-01
Budget End
2014-05-31
Support Year
11
Fiscal Year
2013
Total Cost
$284,482
Indirect Cost
$92,830
Name
Cincinnati Children's Hospital Medical Center
Department
Type
DUNS #
071284913
City
Cincinnati
State
OH
Country
United States
Zip Code
45229
Singh, Sonia R; Robbins, Jeffrey (2018) Desmin and Cardiac Disease: An Unfolding Story. Circ Res 122:1324-1326
Lowey, Susan; Bretton, Vera; Joel, Peteranne B et al. (2018) Hypertrophic cardiomyopathy R403Q mutation in rabbit ?-myosin reduces contractile function at the molecular and myofibrillar levels. Proc Natl Acad Sci U S A 115:11238-11243
Valiente-Alandi, IƱigo; Potter, Sarah J; Salvador, Ane M et al. (2018) Inhibiting Fibronectin Attenuates Fibrosis and Improves Cardiac Function in a Model of Heart Failure. Circulation 138:1236-1252
Meng, Qinghang; Bhandary, Bidur; Bhuiyan, Md Shenuarin et al. (2018) Myofibroblast-Specific TGF? Receptor II Signaling in the Fibrotic Response to Cardiac Myosin Binding Protein C-Induced Cardiomyopathy. Circ Res 123:1285-1297
Singh, Sonia R; Zech, Antonia T L; Geertz, Birgit et al. (2017) Activation of Autophagy Ameliorates Cardiomyopathy in Mybpc3-Targeted Knockin Mice. Circ Heart Fail 10:
Xiang, Fu-Li; Fang, Ming; Yutzey, Katherine E (2017) Loss of ?-catenin in resident cardiac fibroblasts attenuates fibrosis induced by pressure overload in mice. Nat Commun 8:712
Kamal, Fadia A; Travers, Joshua G; Schafer, Allison E et al. (2017) G Protein-Coupled Receptor-G-Protein ??-Subunit Signaling Mediates Renal Dysfunction and Fibrosis in Heart Failure. J Am Soc Nephrol 28:197-208
Khalil, Hadi; Kanisicak, Onur; Prasad, Vikram et al. (2017) Fibroblast-specific TGF-?-Smad2/3 signaling underlies cardiac fibrosis. J Clin Invest 127:3770-3783
McLendon, Patrick M; Davis, Gregory; Gulick, James et al. (2017) An Unbiased High-Throughput Screen to Identify Novel Effectors That Impact on Cardiomyocyte Aggregate Levels. Circ Res 121:604-616
Rudomanova, Valeria; Blaxall, Burns C (2017) Targeting GPCR-G??-GRK2 signaling as a novel strategy for treating cardiorenal pathologies. Biochim Biophys Acta Mol Basis Dis 1863:1883-1892

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