Cited 36 times since 2009 (2.3 per year) source: EuropePMC Developmental dynamics : an official publication of the American Association of Anatomists, Volume 238, Issue 1, 1 1 2009, Pages 183-193 Podoplanin deficient mice show a RhoA-related hypoplasia of the sinus venosus myocardium including the sinoatrial node. Mahtab EA, Vicente-Steijn R, Hahurij ND, Jongbloed MR, Wisse LJ, DeRuiter MC, Uhrin P, Zaujec J, Binder BR, Schalij MJ, Poelmann RE, Gittenberger-de Groot AC
We investigated the role of podoplanin in development of the sinus venosus myocardium comprising the sinoatrial node, dorsal atrial wall, and primary atrial septum as well as the myocardium of the cardinal and pulmonary veins. We analyzed podoplanin wild-type and knockout mouse embryos between embryonic day 9.5-15.5 using immunohistochemical marker podoplanin; sinoatrial-node marker HCN4; myocardial markers MLC-2a, Nkx2.5, as well as Cx43; coelomic marker WT-1; and epithelial-to-mesenchymal transformation markers E-cadherin and RhoA. Three-dimensional reconstructions were made and myocardial morphometry was performed. Podoplanin mutants showed hypoplasia of the sinoatrial node, primary atrial septum, and dorsal atrial wall. Myocardium lining the wall of the cardinal and pulmonary veins was thin and perforated. Impaired myocardial formation is correlated with abnormal epithelial-to-mesenchymal transformation of the coelomic epithelium due to up-regulated E-cadherin and down-regulated RhoA, which are controlled by podoplanin. Our results demonstrate an important role for podoplanin in development of sinus venosus myocardium.
