Abstract
Arterial endothelial cells (EC) at the adult stage differ from capillary and venous EC in terms of resistance to stress; however, the molecular basis of this resistance is not clear. Here, we found that arterial EC are highly resistant to bone morphogenetic protein (BMP)4-dependent apoptosis, whereas capillary and venous EC are not. The expression of inhibitory Smads (I-Smads) in arterial EC was well correlated with the resistance to this apoptosis. After the knockdown of I-Smad expression by short interfering RNA, the resistant arterial EC became sensitive to BMP4. In contrast, the ectopic expression of I-Smads in BMP4-sensitive cells suppressed BMP4-induced apoptosis. Furthermore, intravenous administration of BMP4 into mice caused hemorrhage of capillary EC in brain and lung. These results strongly suggest that BMP4/I-Smads are a novel regulator for the stability of vascular EC.
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Acknowledgements
We thank Dr K Miyazono for kindly providing us with plasmids pcDNA3-FLAG-Smad6 and pcDNA3-FLAG-Smad7. This work was supported by Grants-in-Aid for Special Project Research on Cancer-Bioscience (12215024, 17014020) from the Ministry of Education, Science, Sports and Culture of Japan and for the program ‘Research for the Future’ of the Japan Society for the Promotion of Science and the program ‘Promotion of Fundamental Research in Health Sciences’ from the Organization for Pharmaceutical Safety and Research (OPSR).
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Kiyono, M., Shibuya, M. Inhibitory Smad transcription factors protect arterial endothelial cells from apoptosis induced by BMP4. Oncogene 25, 7131–7137 (2006). https://doi.org/10.1038/sj.onc.1209700
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DOI: https://doi.org/10.1038/sj.onc.1209700
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