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Sci. Signal., 25 October 2011
Vol. 4, Issue 196, p. ra70
[DOI: 10.1126/scisignal.2002278]

RESEARCH ARTICLES

Regulation of Insulin-Like Growth Factor Signaling by Yap Governs Cardiomyocyte Proliferation and Embryonic Heart Size

Mei Xin1, Yuri Kim1, Lillian B. Sutherland1, Xiaoxia Qi1, John McAnally1, Robert J. Schwartz2,3, James A. Richardson1,4, Rhonda Bassel-Duby1, and Eric N. Olson1*

1 Department of Molecular Biology, University of Texas Southwestern Medical Center at Dallas, 5323 Harry Hines Boulevard, Dallas, TX 75390–9148, USA.
2 Texas Heart Institute, Texas Medical Center, Houston, TX 77030, USA.
3 Department of Biology and Biochemistry, University of Houston, Houston, TX 77004, USA.
4 Department of Pathology, University of Texas Southwestern Medical Center at Dallas, Dallas, TX 75390–9148, USA.

Abstract: The Hippo signaling pathway regulates growth of the heart and other tissues. Hippo pathway kinases influence the activity of various targets, including the transcriptional coactivator Yap, but the specific role of Yap in heart growth has not been investigated. We show that Yap is necessary and sufficient for embryonic cardiac growth in mice. Deletion of Yap in the embryonic mouse heart impeded cardiomyocyte proliferation, causing myocardial hypoplasia and lethality at embryonic stage 10.5. Conversely, forced expression of a constitutively active form of Yap in the embryonic heart increased cardiomyocyte number and heart size. Yap activated the insulin-like growth factor (IGF) signaling pathway in cardiomyocytes, resulting in inactivation of glycogen synthase kinase 3β, which led to increased abundance of β-catenin, a positive regulator of cardiac growth. Our results point to Yap as a critical downstream effector of the Hippo pathway in the control of cardiomyocyte proliferation and a nexus for coupling the IGF, Wnt, and Hippo signaling pathways with the developmental program for heart growth.

* To whom correspondence should be addressed. E-mail: eric.olson{at}utsouthwestern.edu

Citation: M. Xin, Y. Kim, L. B. Sutherland, X. Qi, J. McAnally, R. J. Schwartz, J. A. Richardson, R. Bassel-Duby, E. N. Olson, Regulation of Insulin-Like Growth Factor Signaling by Yap Governs Cardiomyocyte Proliferation and Embryonic Heart Size. Sci. Signal. 4, ra70 (2011).

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