Synthesis and biological evaluation of C-ring truncated deguelin derivatives as heat shock protein 90 (HSP90) inhibitors

Ho Shin Kim, Mannkyu Hong, Jihyae Ann, Suyoung Yoon, Cong Truong Nguyen, Su Chan Lee, Ho Young Lee, Young Ger Suh, Ji Hae Seo, Hoon Choi, Jun Yong Kim, Kyu Won Kim, Joohwan Kim, Young Myeong Kim, So Jung Park, Hyun Ju Park, Jeewoo Lee

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Based on the lead compound L-80 (compound 2), a potent heat shock protein 90 (HSP90) inhibitor, a series of C-ring truncated deguelin analogs were designed, synthesized and evaluated for Hypoxia Inducible Factor-1α (HIF-1α) inhibition as a primary screening method. Their structure–activity relationship was investigated in a systematic manner by varying the A/B ring, linker and D/E ring, respectively. Among the synthesized inhibitors, compound 5 exhibited potent HIF-1α inhibition in a dose-dependent manner and significant antitumor activity in human non-small cell lung carcinoma (H1299), with better activities than L-80. It also inhibited in vitro hypoxia-mediated angiogenic processes in human retinal microvascular endothelial cells (HRMEC). The docking study of 5 showed a similar binding mode as L-80: it occupied the C-terminal ATP-binding pocket of HSP90, indicating that the anticancer and antiangiogenic activities of 5 were derived from HIF-1α destabilization by inhibiting the C-terminal ATP-binding site of hHSP90.

Original languageEnglish
Pages (from-to)6082-6093
Number of pages12
JournalBioorganic and Medicinal Chemistry
Volume24
Issue number22
DOIs
StatePublished - 2016

Keywords

  • Antitumor
  • Deguelin
  • Heat shock protein 90
  • HIF-1
  • HSP90
  • Hypoxia Inducible Factor-1

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