A series of 3-subsituted quinolinehydroxamic acids has been synthesised and evaluated for their effect on human lung cancer cell line (A549), human colorectal cancer cell line (HCT116) and HDAC isoforms 1, 2, 6, and 8. The results indicated that substitution at C3 of quinoline is favoured for HDAC6 selectivity. Two compounds (25 and 26) were also found to be potent anti-proliferative compounds with IC50 values ranging from 1.29 to 2.13 µM against A549 and HCT116 cells. These compounds displayed remarkable selectivity for HDAC6 over other HDAC isoforms with nanomolar IC50 values. Western blot analysis revealed that compounds of this series activate apoptotic caspase pathway as indicated by cleavage of caspase 3, 8, and 9 and also increase phosphorylated H2AX thus inducing DNA double strand fragmentation in a concentration dependent manner. Flow cytometric analysis also displayed a dose dependent increase of cell population in sub G1 phase.

Original languageEnglish
Pages (from-to)74-84
Number of pages11
JournalJournal of Enzyme Inhibition and Medicinal Chemistry
Issue number1
Publication statusPublished - Jan 1 2021


  • acrylamide
  • colon cancer
  • HDAC
  • hydroxamic acid
  • lung cancer
  • Quinoline

ASJC Scopus subject areas

  • Pharmacology
  • Drug Discovery


Dive into the research topics of 'Effect of 3-subsitution of quinolinehydroxamic acids on selectivity of histone deacetylase isoforms'. Together they form a unique fingerprint.

Cite this