TY - JOUR
T1 - Development
T2 - Regulation of insulin-like growth factor signaling by Yap governs cardiomyocyte proliferation and embryonic heart size
AU - Xin, Mei
AU - Kim, Yuri
AU - Sutherland, Lillian B.
AU - Qi, Xiaoxia
AU - McAnally, John
AU - Schwartz, Robert J.
AU - Richardson, James A.
AU - Bassel-Duby, Rhonda
AU - Olson, Eric N.
PY - 2011/10/25
Y1 - 2011/10/25
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=80054965145&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=80054965145&partnerID=8YFLogxK
U2 - 10.1126/scisignal.2002278
DO - 10.1126/scisignal.2002278
M3 - Article
C2 - 22028467
AN - SCOPUS:80054965145
SN - 1945-0877
VL - 4
JO - Science signaling
JF - Science signaling
IS - 196
M1 - ra70
ER -