Related Experiment Video

Updated: Jun 7, 2025

Continuous Fluorescence-Based Endonuclease-Coupled DNA Methylation Assay to Screen for DNA Methyltransferase Inhibitors
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Discovery and structure-activity relationship study of nicotinamide derivatives as DNA demethylase ALKBH2 inhibitors

Ke Xu1, Feng Li2, Liang Xiong2

  • 1Key Laboratory of Drug Targeting and Drug Delivery System of Ministry of Education, West China School of Pharmacy, Sichuan University, Chengdu, Sichuan, 610041, China.

European Journal of Medicinal Chemistry
|November 21, 2024
PubMed

Insights

Researchers developed AH2-14c, the first potent and selective inhibitor targeting AlkB homolog 2 (ALKBH2) DNA demethylase. This compound shows promise for glioblastoma treatment and further research into ALKBH2

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Oncology

Background:

  • AlkB homolog 2 (ALKBH2) is an Fe(II) and 2-oxoglutarate (2OG)-dependent DNA demethylase.
  • ALKBH2 is highly expressed in cancers like glioblastoma (GBM), influencing disease progression.
  • There is a lack of potent and selective ALKBH2 inhibitors for therapeutic or research use.

Purpose of the Study:

  • To discover and characterize novel potent and selective inhibitors of ALKBH2.
  • To evaluate the potential of these inhibitors as therapeutic agents for glioblastoma.
  • To explore the mechanism of action of ALKBH2 inhibition in cancer cells.

Main Methods:

  • Synthesis and screening of small molecule inhibitors.
  • Fluorescence polarization (FP) assay to determine IC50 values and selectivity.
  • Cellular assays to assess anti-viability, anti-proliferation, and anti-migration effects in GBM U87 cells.

Main Results:

  • AH2-15c identified as a potent ALKBH2 inhibitor (IC50 = 0.031 μM) with >200-fold selectivity.
  • AH2-14c, a cell-permeable derivative, demonstrated superior efficacy in increasing DNA 3meC modifications in GBM U87 cells.
  • AH2-14c exhibited significant anti-viability, anti-proliferation, and anti-migration activities in U87 cells.

Conclusions:

  • AH2-14c is the first potent and selective ALKBH2 inhibitor with demonstrated cellular activity.
  • This inhibitor holds potential as a foundation for developing new glioblastoma therapies.
  • Further studies can utilize AH2-14c to investigate ALKBH2's role in cancer biology.
Keywords:
ALKBH2GlioblastomaN(3)-methylcytosineSmall molecule inhibitorStructure-activity relationship

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