Pyrvinium, a potent small molecule Wnt inhibitor, promotes wound repair and post-MI cardiac remodeling.

Saraswati S, Alfaro MP, Thorne CA, Atkinson J, Lee E, Young PP
PLoS One. 2010 5 (11): e15521

PMID: 21170416 · PMCID: PMC2993965 · DOI:10.1371/journal.pone.0015521

Wnt signaling plays an important role in developmental and stem cell biology. To test the hypothesis that temporary inhibition of Wnt signaling will enhance granulation tissue and promote angiogenesis in tissue repair, we employed a recently characterized small molecule Wnt inhibitor. Pyrvinium is an FDA-approved drug that we identified as a Wnt inhibitor in a chemical screen for small molecules that stabilize β-catenin and inhibit Axin degradation. Our subsequent characterization of pyrvinium has revealed that its critical cellular target in the Wnt pathway is Casein Kinase 1α. Daily administration of pyrvinium directly into polyvinyl alcohol (PVA) sponges implanted subcutaneously in mice generated better organized and vascularized granulation tissue; this compound also increased the proliferative index of the tissue within the sponges. To evaluate its effect in myocardial repair, we induced a myocardial infarction (MI) by coronary artery ligation and administered a single intramyocardial dose of pyrvinium. Mice were evaluated by echocardiography at 7 and 30 days post-MI and treatment; post mortem hearts were evaluated by histology at 30 days. Pyrvinium reduced adverse cardiac remodeling demonstrated by decreased left ventricular internal diameter in diastole (LVIDD) as compared to a control compound. Increased Ki-67+ cells were observed in peri-infarct and distal myocardium of pyrvinium-treated animals. These results need to be further followed-up to determine if therapeutic inhibition of canonical Wnt may avert adverse remodeling after ischemic injury and its impact on myocardial repair and regeneration.

MeSH Terms (25)

Adaptor Proteins, Signal Transducing Animals Axin Protein beta Catenin Casein Kinase Ialpha Cell Proliferation Chemokines Enzyme Activation Gene Expression Heart HEK293 Cells Humans Immunoblotting Intercellular Signaling Peptides and Proteins Mice Myocardial Infarction Myocardium Proto-Oncogene Proteins c-myc Pyrvinium Compounds Repressor Proteins Reverse Transcriptase Polymerase Chain Reaction Signal Transduction Ventricular Remodeling Wnt Proteins Wound Healing

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