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Quinoline-Based DNA Methyltransferase Inhibitors Featuring Basic Side Chains: Design, Synthesis, and Insight in

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New quinoline-based compounds selectively inhibit DNA methyltransferases (DNMTs), crucial enzymes in cancer. Compound 14 effectively reactivated a tumor suppressor gene and showed potent anti-cancer effects in HCT-116 cells.

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Area of Science:

  • Medicinal Chemistry
  • Molecular Biology
  • Cancer Research

Background:

  • DNA methyltransferases (DNMTs) are key regulators of DNA methylation and are implicated in various cancers.
  • Targeting DNMTs offers a therapeutic strategy for cancer treatment by reactivating silenced tumor suppressor genes.
  • Developing selective DNMT inhibitors is crucial to minimize off-target effects and enhance therapeutic efficacy.

Purpose of the Study:

  • To design, synthesize, and evaluate novel quinoline-based compounds as DNMT inhibitors.
  • To assess the selectivity of these inhibitors for different DNMT isoforms (DNMT1 and DNMT3A/3L).
  • To investigate the mechanism of action and anti-cancer effects of the most potent compounds in cancer cell lines.

Main Methods:

  • Synthesis and pharmacomodulation of quinoline derivatives.
  • Direct measurement of DNA methylation inhibition by DNMT enzymes.
  • DNA thermal denaturation assays to assess DNA interaction.
  • COBRA (Combined Bisulfite Restriction Analysis) for analyzing gene methylation in cancer cells.
  • Cell viability assays and apoptosis studies in cancer cell lines.

Main Results:

  • Several quinoline derivatives (compounds 4-21) were synthesized, with some exhibiting nanomolar inhibitory activity against DNMT1 and DNMT3A/3L.
  • Compounds 10 and 14 demonstrated potent and selective inhibition, targeting DNMT3A/3L and DNMT1, respectively.
  • Selected compounds showed strong interaction with DNA.
  • In HCT-116 colon cancer cells, compound 14 selectively reduced P16INK4A methylation, leading to tumor suppressor gene reactivation.
  • Compound 14 displayed significant antiproliferative effects in HCT-116 cells, with a P53-dependent mechanism of action.

Conclusions:

  • Novel quinoline-based compounds can effectively inhibit DNMTs with isoform selectivity.
  • Compound 14 is a potent DNMT inhibitor with selective anti-cancer activity in HCT-116 cells, mediated through a P53-dependent pathway.
  • These findings highlight the potential of these quinoline derivatives as a new class of epigenetic drugs for cancer therapy.