Abstract
Vascular endothelial growth factor (VEGF) is a major angiogenic factor that activates pro-angiogenic molecules to generate new vessels. Recently, we identified a VEGF-A-induced pro-angiogenic gene, BCL-6 associated zinc finger protein (BAZF), in endothelial cells. BAZF interacts with CBF1, a transcriptional regulator of Notch signaling, and downregulates Notch signaling by inducing the degradation of CBF1. A signal inhibition assay with a combination of chemical inhibitors and siRNA revealed that the protein kinase D (PRKD) family, mainly PRKD2, mediated BAZF gene expression by VEGF-A stimulation. A luciferase reporter assay showed that the promoter activity of the BAZF gene was unchanged by VEGF-A stimulation. However, we found that the stability of BAZF mRNA increased in a VEGF-A/PRKD2-dependent manner. In further studies to investigate the underlying mechanism, we successfully identified heat shock protein 90 beta (HSP90β) as a molecule that interacts with and stabilizes BAZF mRNA following VEGF-A/PRKD2 activation. These data suggest that HSP90β may positively regulate angiogenesis, not only as a protein chaperone, but also as an mRNA stabilizer for pro-angiogenic genes, such as BAZF, in a PRKD2 activity-dependent manner.
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Acknowledgments
We would like to thank Drs. Yoshimura (Keio University), Nishimura (Kumamoto University), and Miyoshi (RIKEN BioResource Center) for kindly providing the plasmids used in this study. We gratefully appreciate discussions with Drs. Matsushita, Ohnuki, and Nakayama of Ehime University. This study was supported by a grant from Ehime University (D.M.: 054402060) and a Grant-in-Aid for Scientific Research (23112513 to S. Higashiyama, 22590501 to H. Inoue) from the Ministry of Education, Culture, Sports, Science, and Technology, Japan.
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The authors declare that there are no conflicts of interest that would prejudice the impartiality of this scientific work.
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Miwa, D., Sakaue, T., Inoue, H. et al. Protein kinase D2 and heat shock protein 90 beta are required for BCL6-associated zinc finger protein mRNA stabilization induced by vascular endothelial growth factor-A. Angiogenesis 16, 675–688 (2013). https://doi.org/10.1007/s10456-013-9345-x
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DOI: https://doi.org/10.1007/s10456-013-9345-x