author_facet Ma, Lijiang
Lu, Mei-Fang
Schwartz, Robert J.
Martin, James F.
Ma, Lijiang
Lu, Mei-Fang
Schwartz, Robert J.
Martin, James F.
author Ma, Lijiang
Lu, Mei-Fang
Schwartz, Robert J.
Martin, James F.
spellingShingle Ma, Lijiang
Lu, Mei-Fang
Schwartz, Robert J.
Martin, James F.
Development
Bmp2is essential for cardiac cushion epithelial-mesenchymal transition and myocardial patterning
Developmental Biology
Molecular Biology
author_sort ma, lijiang
spelling Ma, Lijiang Lu, Mei-Fang Schwartz, Robert J. Martin, James F. 1477-9129 0950-1991 The Company of Biologists Developmental Biology Molecular Biology http://dx.doi.org/10.1242/dev.02156 <jats:p>Cardiac cushion development provides a valuable system to investigate epithelial to mesenchymal transition (EMT), a fundamental process in development and tumor progression. In the atrioventricular (AV) canal,endocardial cells lining the heart respond to a myocardial-derived signal,undergo EMT, and contribute to cushion mesenchyme. Here, we inactivated bone morphogenetic protein 2 (Bmp2) in the AV myocardium of mice. We show that Bmp2 has three functions in the AV canal: to enhance formation of the cardiac jelly, to induce endocardial EMT and to pattern the AV myocardium. Bmp2 is required for myocardial expression of Has2, a crucial component of the cardiac jelly matrix. During EMT,Bmp2 promotes expression of the basic helix-loop-helix factor Twist1,previously implicated in EMT in cancer metastases, and the homeobox genes Msx1 and Msx2. Deletion of the Bmp type 1A receptor, Bmpr1a, in endocardium also resulted in failed cushion formation,indicating that Bmp2 signals directly to cushion-forming endocardium to induce EMT. Lastly, we show that Bmp2 mutants failed to specify the AV myocardium with loss of Tbx2 expression uncovering a myocardial, planar signaling function for Bmp2. Our data indicate that Bmp2 has a crucial role in coordinating multiple aspects of AV canal morphogenesis.</jats:p> <i>Bmp2</i>is essential for cardiac cushion epithelial-mesenchymal transition and myocardial patterning Development
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title Bmp2is essential for cardiac cushion epithelial-mesenchymal transition and myocardial patterning
title_unstemmed Bmp2is essential for cardiac cushion epithelial-mesenchymal transition and myocardial patterning
title_full Bmp2is essential for cardiac cushion epithelial-mesenchymal transition and myocardial patterning
title_fullStr Bmp2is essential for cardiac cushion epithelial-mesenchymal transition and myocardial patterning
title_full_unstemmed Bmp2is essential for cardiac cushion epithelial-mesenchymal transition and myocardial patterning
title_short Bmp2is essential for cardiac cushion epithelial-mesenchymal transition and myocardial patterning
title_sort <i>bmp2</i>is essential for cardiac cushion epithelial-mesenchymal transition and myocardial patterning
topic Developmental Biology
Molecular Biology
url http://dx.doi.org/10.1242/dev.02156
publishDate 2005
physical 5601-5611
description <jats:p>Cardiac cushion development provides a valuable system to investigate epithelial to mesenchymal transition (EMT), a fundamental process in development and tumor progression. In the atrioventricular (AV) canal,endocardial cells lining the heart respond to a myocardial-derived signal,undergo EMT, and contribute to cushion mesenchyme. Here, we inactivated bone morphogenetic protein 2 (Bmp2) in the AV myocardium of mice. We show that Bmp2 has three functions in the AV canal: to enhance formation of the cardiac jelly, to induce endocardial EMT and to pattern the AV myocardium. Bmp2 is required for myocardial expression of Has2, a crucial component of the cardiac jelly matrix. During EMT,Bmp2 promotes expression of the basic helix-loop-helix factor Twist1,previously implicated in EMT in cancer metastases, and the homeobox genes Msx1 and Msx2. Deletion of the Bmp type 1A receptor, Bmpr1a, in endocardium also resulted in failed cushion formation,indicating that Bmp2 signals directly to cushion-forming endocardium to induce EMT. Lastly, we show that Bmp2 mutants failed to specify the AV myocardium with loss of Tbx2 expression uncovering a myocardial, planar signaling function for Bmp2. Our data indicate that Bmp2 has a crucial role in coordinating multiple aspects of AV canal morphogenesis.</jats:p>
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author Ma, Lijiang, Lu, Mei-Fang, Schwartz, Robert J., Martin, James F.
author_facet Ma, Lijiang, Lu, Mei-Fang, Schwartz, Robert J., Martin, James F., Ma, Lijiang, Lu, Mei-Fang, Schwartz, Robert J., Martin, James F.
author_sort ma, lijiang
container_issue 24
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container_title Development
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description <jats:p>Cardiac cushion development provides a valuable system to investigate epithelial to mesenchymal transition (EMT), a fundamental process in development and tumor progression. In the atrioventricular (AV) canal,endocardial cells lining the heart respond to a myocardial-derived signal,undergo EMT, and contribute to cushion mesenchyme. Here, we inactivated bone morphogenetic protein 2 (Bmp2) in the AV myocardium of mice. We show that Bmp2 has three functions in the AV canal: to enhance formation of the cardiac jelly, to induce endocardial EMT and to pattern the AV myocardium. Bmp2 is required for myocardial expression of Has2, a crucial component of the cardiac jelly matrix. During EMT,Bmp2 promotes expression of the basic helix-loop-helix factor Twist1,previously implicated in EMT in cancer metastases, and the homeobox genes Msx1 and Msx2. Deletion of the Bmp type 1A receptor, Bmpr1a, in endocardium also resulted in failed cushion formation,indicating that Bmp2 signals directly to cushion-forming endocardium to induce EMT. Lastly, we show that Bmp2 mutants failed to specify the AV myocardium with loss of Tbx2 expression uncovering a myocardial, planar signaling function for Bmp2. Our data indicate that Bmp2 has a crucial role in coordinating multiple aspects of AV canal morphogenesis.</jats:p>
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spelling Ma, Lijiang Lu, Mei-Fang Schwartz, Robert J. Martin, James F. 1477-9129 0950-1991 The Company of Biologists Developmental Biology Molecular Biology http://dx.doi.org/10.1242/dev.02156 <jats:p>Cardiac cushion development provides a valuable system to investigate epithelial to mesenchymal transition (EMT), a fundamental process in development and tumor progression. In the atrioventricular (AV) canal,endocardial cells lining the heart respond to a myocardial-derived signal,undergo EMT, and contribute to cushion mesenchyme. Here, we inactivated bone morphogenetic protein 2 (Bmp2) in the AV myocardium of mice. We show that Bmp2 has three functions in the AV canal: to enhance formation of the cardiac jelly, to induce endocardial EMT and to pattern the AV myocardium. Bmp2 is required for myocardial expression of Has2, a crucial component of the cardiac jelly matrix. During EMT,Bmp2 promotes expression of the basic helix-loop-helix factor Twist1,previously implicated in EMT in cancer metastases, and the homeobox genes Msx1 and Msx2. Deletion of the Bmp type 1A receptor, Bmpr1a, in endocardium also resulted in failed cushion formation,indicating that Bmp2 signals directly to cushion-forming endocardium to induce EMT. Lastly, we show that Bmp2 mutants failed to specify the AV myocardium with loss of Tbx2 expression uncovering a myocardial, planar signaling function for Bmp2. Our data indicate that Bmp2 has a crucial role in coordinating multiple aspects of AV canal morphogenesis.</jats:p> <i>Bmp2</i>is essential for cardiac cushion epithelial-mesenchymal transition and myocardial patterning Development
spellingShingle Ma, Lijiang, Lu, Mei-Fang, Schwartz, Robert J., Martin, James F., Development, Bmp2is essential for cardiac cushion epithelial-mesenchymal transition and myocardial patterning, Developmental Biology, Molecular Biology
title Bmp2is essential for cardiac cushion epithelial-mesenchymal transition and myocardial patterning
title_full Bmp2is essential for cardiac cushion epithelial-mesenchymal transition and myocardial patterning
title_fullStr Bmp2is essential for cardiac cushion epithelial-mesenchymal transition and myocardial patterning
title_full_unstemmed Bmp2is essential for cardiac cushion epithelial-mesenchymal transition and myocardial patterning
title_short Bmp2is essential for cardiac cushion epithelial-mesenchymal transition and myocardial patterning
title_sort <i>bmp2</i>is essential for cardiac cushion epithelial-mesenchymal transition and myocardial patterning
title_unstemmed Bmp2is essential for cardiac cushion epithelial-mesenchymal transition and myocardial patterning
topic Developmental Biology, Molecular Biology
url http://dx.doi.org/10.1242/dev.02156