2. Academic Validation
  3. Novel indolizino[8,7-b]indole hybrids as anti-small cell lung cancer agents: Regioselective modulation of topoisomerase II inhibitory and DNA crosslinking activities

Novel indolizino[8,7-b]indole hybrids as anti-small cell lung cancer agents: Regioselective modulation of topoisomerase II inhibitory and DNA crosslinking activities

  • Eur J Med Chem. 2017 Feb 15:127:235-249. doi: 10.1016/j.ejmech.2016.12.046.
Sue-Ming Chang 1,  Wilson Christian 2,  Ming-Hsi Wu 1,  Tai-Lin Chen 3,  Yi-Wen Lin 1,  Ching-Shu Suen 1,  Hima Bindu Pidugu 1,  Dilip Detroja 2,  Anamik Shah 4,  Ming-Jing Hwang 1,  Tsann-Long Su 5,  Te-Chang Lee 6
Affiliations

Affiliations

  • 1 Institute of Biomedical Sciences, Academia Sinica, Taipei 11529, Taiwan.
  • 2 Institute of Biomedical Sciences, Academia Sinica, Taipei 11529, Taiwan; Department of Chemistry, Saurashtra University, Rajkot, Gujarat, India.
  • 3 Institute of Biomedical Sciences, Academia Sinica, Taipei 11529, Taiwan; Institute of Biochemistry and Molecular Biology, National Yang-Ming University, Taipei, Taiwan.
  • 4 Department of Chemistry, Saurashtra University, Rajkot, Gujarat, India.
  • 5 Institute of Biomedical Sciences, Academia Sinica, Taipei 11529, Taiwan. Electronic address: [email protected].
  • 6 Institute of Biomedical Sciences, Academia Sinica, Taipei 11529, Taiwan. Electronic address: [email protected].
PMID: 28064078 DOI: 10.1016/j.ejmech.2016.12.046
Abstract

A novel series of bis(hydroxymethyl)indolizino[8,7-b]indole hybrids composed of β-carboline (Topoisomerase I/II inhibition) and bis(hydroxymethyl)pyrrole (DNA cross-linking) are synthesized for antitumor evaluation. Of tumor cell lines tested, small cell lung Cancer (SCLC) cell lines are the most sensitive to the newly synthesized compounds. These hybrids induce cell cycle arrest at the G2/M phase, trigger tumor cell apoptotic death, and display diverse mechanisms of action involving Topoisomerase II (Topo II) inhibition and induction of DNA cross-linking. Intriguingly, the substituent at N11 (H or Me) plays a critical role in modulating Topo II inhibition and DNA cross-linking activities. N11-Me derivatives predispose to induce DNA crosslinks, whereas N11-H derivatives potently inhibit Topo II. Computational analysis implicates that N11-Me restrict the torsion angles of the two adjacent OH on pyrrole resulting in a favorable of DNA cross-linking. Among these hybrids, compound 17a with N11-H is more effective than cisplatin and etoposide, but as potent as irinotecan, against the growth of SCLC H526 cells in xenograft model.

Keywords

Anti-SCLC hybrids; DNA cross-linking; Topoisomerase inhibition; bis(hydroxymethyl)pyrrole; indolizino[8,7-b]indole; β-carboline.

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