Role of smad- and wnt-dependent pathways in embryonic cardiac development

Stem Cells and Development
Rajarshi Pal, Aparna Khanna

Abstract

The development of the heart is essential for embryogenesis and precedes development of other organs. However, the mechanisms involved in embryonic cardiac development are ill-defined. Recent evidence suggests that Smad and Wnt signaling pathways are important in stem cell fate determination and their commitment to cardiovascular differentiation. We have previously reported that bone morphogenetic proteins (BMP)-2, -5, and -7 and fibroblast growth factors (FGF)-2 and -4 secreted from the adjoining endodermal cells favor cardiac differentiation in murine embryonic stem (ES) cells. Here, we demonstrate that BMP-2, -5, and -7 stimulate receptor-activated Smad1, 5, and 8, which in turn causes oligomerization of Smad4 in the nucleus. We further delineate the role of Wnt signaling pathway as evidenced by induction of Wnt3 and Wnt8b, stimulation of FRP-1, inhibition of GSK-B, accumulation of cytosolic beta-catenin, and transcription of target genes, including c-myc and cyclin-D1. We also ascertained the specificity of BMP- and Wnt-evoked activation of signaling cascades. Our data are consistent with the hypothesis that BMP-dependent activation of transcription factors including GATA-4, Nkx2.5, and MEF-2C augments cardiac differentiati...Continue Reading

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May 2, 2006·Stem Cells and Development·Denis English, Paul R Sanberg
Sep 26, 2013·Cardiovascular Research·Jeong A LimSang Soo Kim
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Jan 26, 2020·Cells·Chandrakala Aluganti Narasimhulu, Dinender K Singla
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