Inhibition of Notch2 by Numb/Numblike controls myocardial compaction in the heart

Yang, Jiwen and Bücker, Sandra and Jungblut, Benno and Böttger, Thomas and Cinnamon, Yuval and Tchorz, Jan and Müller, Matthias and Bettler, Bernhard and Harvey, Richard and Sun, Qing-Yuan and Schneider, Andre and Braun, Thomas. (2012) Inhibition of Notch2 by Numb/Numblike controls myocardial compaction in the heart. Cardiovascular research, Vol. 96, H. 2. pp. 276-285.

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Official URL: http://edoc.unibas.ch/dok/A6124479

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The ventricular wall of the heart is composed of trabeculated and compact layers, which are separated by yet unknown processes during embryonic development. Here, we wanted to explore the role of Notch2 and Numb/Numblike for myocardial trabeculation and compaction.; We found that Notch2 activity is specifically down-regulated in the compact layer during cardiac development in the mouse. The biological role of Notch2 down-regulation was investigated by the expression of constitutively active Notch2 in the myocardium of transgenic mice, resulting in hypertrabeculation, reduced compaction, and ventricular septum defects. To disclose the mechanism that inhibited Notch2 activity during the formation of myocardial layers, we analysed potential suppressors of Notch signalling. We unveiled that concomitant but not separate ablation of Numb and Numblike in the developing heart leads to increased Notch2 activity along with hypertrabeculation, reduced compaction, and ventricular septum defects, phenocopying effects gained by overexpression of constitutively active Notch2. Expression profiling revealed a strong up-regulation of Bmp10 in Numb/Numblike mutant hearts, which might also interfere with trabeculation and compaction.; This study identified potential novel roles of Numb/Numblike in regulating trabeculation and compaction by inhibiting Notch2 and Bmp10 signalling.
Faculties and Departments:03 Faculty of Medicine > Departement Biomedizin > Division of Physiology > Molecular Neurobiology Synaptic Plasticity (Bettler)
UniBasel Contributors:Bettler, Bernhard
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Oxford University Press
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:08 May 2015 08:45
Deposited On:24 May 2013 09:20

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