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  Endothelial p53 deletion improves angiogenesis and prevents cardiac fibrosis and heart failure induced by pressure overload in mice.

Gogiraju, R., Xu, X., Bochenek, M. L., Steinbrecher, J. H., Lehnart, S. E., Wenzel, P., et al. (2015). Endothelial p53 deletion improves angiogenesis and prevents cardiac fibrosis and heart failure induced by pressure overload in mice. Journal of the American Heart Association, 4(2): e001770. doi:10.1161/JAHA.115.001770.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0026-B7CF-3 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-105E-E
Genre: Journal Article

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2147075.pdf (Publisher version), 7MB
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 Creators:
Gogiraju, R., Author
Xu, X., Author
Bochenek, M. L, Author
Steinbrecher, J. H, Author
Lehnart, S. E, Author
Wenzel, P., Author
Kessel, M.1, Author              
Zeisberg, E. M, Author
Dobbelstein, M., Author
Schäfer, K., Author
Affiliations:
1Research Group of Developmental Biology, MPI for biophysical chemistry, Max Planck Society, ou_578586              

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Free keywords: angiogenesis; endothelium; fibrosis; heart failure; p53
 Abstract: Background Cardiac dysfunction developing in response to chronic pressure overload is associated with apoptotic cell death and myocardial vessel rarefaction. We examined whether deletion of tumor suppressor p53 in endothelial cells may prevent the transition from cardiac hypertrophy to heart failure. Methods and Results Mice with endothelial‐specific deletion of p53 (End.p53‐KO) were generated by crossing p53fl/fl mice with mice expressing Cre recombinase under control of an inducible Tie2 promoter. Cardiac hypertrophy was induced by transverse aortic constriction. Serial echocardiography measurements revealed improved cardiac function in End.p53‐KO mice that also exhibited better survival. Cardiac hypertrophy was associated with increased p53 levels in End.p53‐WT controls, whereas banded hearts of End.p53‐KO mice exhibited lower numbers of apoptotic endothelial and non‐endothelial cells and altered mRNA levels of genes regulating cell cycle progression (p21), apoptosis (Puma), or proliferation (Pcna). A higher cardiac capillary density and improved myocardial perfusion was observed, and pharmacological inhibition or genetic deletion of p53 also promoted endothelial sprouting in vitro and new vessel formation following hindlimb ischemia in vivo. Hearts of End.p53‐KO mice exhibited markedly less fibrosis compared with End.p53‐WT controls, and lower mRNA levels of p53‐regulated genes involved in extracellular matrix production and turnover (eg, Bmp‐7, Ctgf, or Pai‐1), or of transcription factors involved in controlling mesenchymal differentiation were observed. Conclusions Our analyses reveal that accumulation of p53 in endothelial cells contributes to blood vessel rarefaction and fibrosis during chronic cardiac pressure overload and suggest that endothelial cells may be a therapeutic target for preserving cardiac function during hypertrophy.

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Language(s): eng - English
 Dates: 2015-02-24
 Publication Status: Published online
 Pages: -
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1161/JAHA.115.001770
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Title: Journal of the American Heart Association
Source Genre: Journal
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Pages: 22 Volume / Issue: 4 (2) Sequence Number: e001770 Start / End Page: - Identifier: -