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A role for BRG1 in the regulation of genes required for development of the lymphatic system

Lymphatic vasculature is an important part of the cardiovascular system with multiple functions, including regulation of the return of interstitial fluid (lymph) to the bloodstream, immune responses, and fat absorption. Consequently, lymphatic vasculature defects are involved in many pathological pr...

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Autores principales: Singh, Ajeet Pratap, Foley, Julie, Tandon, Arpit, Phadke, Dhiral, Karimi Kinyamu, H., Archer, Trevor K.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Impact Journals LLC 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5589631/
https://www.ncbi.nlm.nih.gov/pubmed/28903392
http://dx.doi.org/10.18632/oncotarget.18976
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author Singh, Ajeet Pratap
Foley, Julie
Tandon, Arpit
Phadke, Dhiral
Karimi Kinyamu, H.
Archer, Trevor K.
author_facet Singh, Ajeet Pratap
Foley, Julie
Tandon, Arpit
Phadke, Dhiral
Karimi Kinyamu, H.
Archer, Trevor K.
author_sort Singh, Ajeet Pratap
collection PubMed
description Lymphatic vasculature is an important part of the cardiovascular system with multiple functions, including regulation of the return of interstitial fluid (lymph) to the bloodstream, immune responses, and fat absorption. Consequently, lymphatic vasculature defects are involved in many pathological processes, including tumor metastasis and lymphedema. BRG1 is an important player in the developmental window when the lymphatic system is initiated. In the current study, we used tamoxifen inducible Rosa26CreERT2-BRG1(floxed/floxed) mice that allowed temporal analysis of the impact of BRG1 inactivation in the embryo. The BRG1(floxed/floxed/Cre-TM) embryos exhibited edema and hemorrhage at embryonic day-13 and began to die. BRG1 deficient embryos had abnormal lymphatic sac linings with fewer LYVE1 positive lymphatic endothelial cells. Indeed, loss of BRG1 attenuated expression of a subset of lymphatic genes in-vivo. Furthermore, BRG1 binds at the promoters of COUP-TFII and LYVE1, suggesting that BRG1 modulates expression of these genes in the developing embryos. Conversely, re-expression of BRG1 in cells lacking endogenous BRG1 resulted in induction of lymphatic gene expression in-vitro, suggesting that BRG1 was both required and sufficient for lymphatic gene expression. These studies provide important insights into intrinsic regulation of BRG1-mediated lymphatic-gene expression, and further an understanding of lymphatic gene dysregulation in lymphedema and other disease conditions.
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spelling pubmed-55896312017-09-12 A role for BRG1 in the regulation of genes required for development of the lymphatic system Singh, Ajeet Pratap Foley, Julie Tandon, Arpit Phadke, Dhiral Karimi Kinyamu, H. Archer, Trevor K. Oncotarget Research Paper Lymphatic vasculature is an important part of the cardiovascular system with multiple functions, including regulation of the return of interstitial fluid (lymph) to the bloodstream, immune responses, and fat absorption. Consequently, lymphatic vasculature defects are involved in many pathological processes, including tumor metastasis and lymphedema. BRG1 is an important player in the developmental window when the lymphatic system is initiated. In the current study, we used tamoxifen inducible Rosa26CreERT2-BRG1(floxed/floxed) mice that allowed temporal analysis of the impact of BRG1 inactivation in the embryo. The BRG1(floxed/floxed/Cre-TM) embryos exhibited edema and hemorrhage at embryonic day-13 and began to die. BRG1 deficient embryos had abnormal lymphatic sac linings with fewer LYVE1 positive lymphatic endothelial cells. Indeed, loss of BRG1 attenuated expression of a subset of lymphatic genes in-vivo. Furthermore, BRG1 binds at the promoters of COUP-TFII and LYVE1, suggesting that BRG1 modulates expression of these genes in the developing embryos. Conversely, re-expression of BRG1 in cells lacking endogenous BRG1 resulted in induction of lymphatic gene expression in-vitro, suggesting that BRG1 was both required and sufficient for lymphatic gene expression. These studies provide important insights into intrinsic regulation of BRG1-mediated lymphatic-gene expression, and further an understanding of lymphatic gene dysregulation in lymphedema and other disease conditions. Impact Journals LLC 2017-07-04 /pmc/articles/PMC5589631/ /pubmed/28903392 http://dx.doi.org/10.18632/oncotarget.18976 Text en Copyright: © 2017 Singh et al. http://creativecommons.org/licenses/by/3.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License 3.0 (http://creativecommons.org/licenses/by/3.0/) (CC BY 3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Paper
Singh, Ajeet Pratap
Foley, Julie
Tandon, Arpit
Phadke, Dhiral
Karimi Kinyamu, H.
Archer, Trevor K.
A role for BRG1 in the regulation of genes required for development of the lymphatic system
title A role for BRG1 in the regulation of genes required for development of the lymphatic system
title_full A role for BRG1 in the regulation of genes required for development of the lymphatic system
title_fullStr A role for BRG1 in the regulation of genes required for development of the lymphatic system
title_full_unstemmed A role for BRG1 in the regulation of genes required for development of the lymphatic system
title_short A role for BRG1 in the regulation of genes required for development of the lymphatic system
title_sort role for brg1 in the regulation of genes required for development of the lymphatic system
topic Research Paper
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5589631/
https://www.ncbi.nlm.nih.gov/pubmed/28903392
http://dx.doi.org/10.18632/oncotarget.18976
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