Wnt5a-mediated Adipo-Cardiac Interorgan Communication in HFpEF
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Background
Obesity is an important risk factor in heart failure with preserved ejection fraction (HFpEF), but the precise mechanisms that drive obesity-associated cardiac remodeling are not well understood. Our previous work has shown that increased expression of the natriuretic peptide clearance receptor ( Nprc ) may drive cardiac remodeling in response to high fat diet. In this study, we hypothesized that Nprc plays a central role in preventing and reversing experimental HFpEF.
Methods
Nprc knockout mice were generated to induce global, cardiomyocyte-specific, or adipocyte-specific disruption of the Nprc ( Npr3 ) gene. HFpEF was induced by the 2-hit stress of L-NAME and high fat diet. Outcomes measured included echocardiography, exercise endurance, invasive catheterization, and histologic assessment. Differential gene expression in adipocyte Nprc knockout visceral adipose tissue was investigated via bulk RNA sequencing and validated by RT-qPCR and culture of H9C2 cells with or without Wnt5a treatment. Adipocyte-mediated Wnt ligand release was interrupted in vivo via LGK974 injection in mice subjected to HFpEF conditions.
Results
Global inducible Nprc knockout prevented and reversed structural, hemodynamic, echocardiographic, and exercise tolerance features of HFpEF. This effect was found to be driven by adipocyte-specific, not cardiomyocyte-specific Nprc expression. Bulk RNA sequencing of adipocyte-specific Nprc knockout in peri-gonadal visceral adipose tissue identified downregulation of several secretory pathways, including Wnt pathways. Wnt5a was identified as one of the most downregulated genes by RNA sequencing and specifically validated by qPCR. Wnt5a exposure increased cardiomyocyte hypertrophy in vitro , and LGK974 (PORCN inhibitor) treatment in vivo decreased circulating Wnt5a levels and improved cardiac remodeling in HFpEF.
Conclusions
Our study identifies a novel crosstalk mechanism between cardiomyocytes and adipocytes in obesity-associated HFpEF driven by natriuretic peptide-mediated inhibition of release of Wnt5a from adipocytes.
