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Dynamic Expression Profiles of β-Catenin during Murine Cardiac Valve Development.

Journal of cardiovascular development and disease (2020-08-23)
Lilong Guo, Janiece Glover, Alyssa Risner, Christina Wang, Diana Fulmer, Kelsey Moore, Cortney Gensemer, Mary Kate Rumph, Reece Moore, Tyler Beck, Russell A Norris

β-catenin has been widely studied in many animal and organ systems across evolution, and gain or loss of function has been linked to a number of human diseases. Yet fundamental knowledge regarding its protein expression and localization remains poorly described. Thus, we sought to define whether there was a temporal and cell-specific regulation of β-catenin activities that correlate with distinct cardiac morphological events. Our findings indicate that activated nuclear β-catenin is primarily evident early in gestation. As development proceeds, nuclear β-catenin is down-regulated and becomes restricted to the membrane in a subset of cardiac progenitor cells. After birth, little β-catenin is detected in the heart. The co-expression of β-catenin with its main transcriptional co-factor, Lef1, revealed that Lef1 and β-catenin expression domains do not extensively overlap in the cardiac valves. These data indicate mutually exclusive roles for Lef1 and β-catenin in most cardiac cell types during development. Additionally, these data indicate diverse functions for β-catenin within the nucleus and membrane depending on cell type and gestational timing. Cardiovascular studies should take into careful consideration both nuclear and membrane β-catenin functions and their potential contributions to cardiac development and disease.

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Hyaluronic Acid Binding Protein, Bovine Nasal Cartilage, Biotinylated