A multivalent peptide as an activator of hypoxia inducible factor-1¦Á

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• 作者：Hyuk Sung Kwon^a ; ^c ; Jiae Park^a ; Yong Keun Park^c ; Dae-Ro Ahn^a ; ^b ; ^{drahn@kist.re.kr}
• 关键词：Hypoxia-inducible factor ; Peptide inhibitor ; VBC ; Multivalent peptide inhibitor ; VEGF
• 刊名：Bioorganic and Medicinal Chemistry Letters
• 出版年：2013
• 出版时间：15 March, 2013
• 年：2013
• 卷：23
• 期：6
• 页码：1716-1719
• 全文大小：477 K

文摘

Hypoxia inducible factor-1¦Á (HIF-1¦Á) is a transcription factor found in mammalian cells under hypoxia. While HIF-1¦Á in hypoxia translocates to the nucleus where it transcribes the target genes including vascular endothelial growth factor (VEGF) mRNA, HIF-1¦Á is degraded under normoxia, which involves its proline hydroxylation and subsequent binding to the von Hippel-Lindau protein-Elongin B-Elogin C (VBC) complex. Previously, peptide inhibitors against this interaction between hydroxylated HIF-1¦Á and VBC have been developed to stabilize the transcriptional activity of HIF-1¦Á by preventing the degradation of the protein even under normoxia. Despite the specific inhibition by these peptides, their poor inhibition potency needs to be improved for further clinical application. In this work, we have designed and prepared a streptavidin-based multivalent peptide inhibitor against the HIF-1¦Á-VBC complexation. We have evaluated the potency of the multivalent peptide in terms of stabilization of HIF-1¦Á and the downstream effect. As the result, we have found that the inhibitor showed about 13-fold lowered IC₅₀ value compared with that of the corresponding monovalent peptide, thereby activating HIF-1¦Á and leading to up-regulation of VEGF protein at the cellular level.