Related Experiment Video
Updated: Jun 8, 2026
Tools to Study the Role of Architectural Protein HMGB1 in the Processing of Helix Distorting, Site-specific DNA Interstrand Crosslinks
Published on: November 10, 2016
Balancing Affinity, Selectivity, and Cytotoxicity of Hydrazone-Based G-Quadruplex Ligands for Activation of
Simona Marzano1, Giulia Miglietta2, Rita Morigi2
1Department of Pharmacy, University of Naples Federico II, 80131 Naples, Italy.
Abstract:
G-quadruplex (G4) ligands are investigated to discover new anticancer drugs with increased cell-killing potency. These ligands can induce genome instability and activate innate immune genes at non-cytotoxic doses, opening the discovery of cytostatic immune-stimulating ligands. However, the interplay of G4 affinity/selectivity with cytotoxicity and immune gene activation is not well-understood. We investigated a series of closely related hydrazone derivatives to define the molecular bases of immune-stimulation activity. Although they are closely related to each other, such derivatives differ in G4 affinity, cytotoxicity, genome instability, and immune gene activation. Our findings show that G4 affinity of ligands is a critical feature for immune gene activation, whereas a high cytotoxic potency interferes with it. The balance of G4 stabilization versus cytotoxicity can determine the level of immune gene activation in cancer cells. Thus, we propose a new rationale based on low cell-killing potency and high immune stimulation to discover effective anticancer G4 ligands.
Insights
New anticancer drugs targeting G-quadruplex (G4) structures show promise. Ligands with high G4 affinity but low cytotoxicity effectively stimulate immune genes, offering a novel therapeutic strategy.
Area of Science:
- Oncology
- Drug Discovery
- Immunology
Background:
- G-quadruplex (G4) ligands are explored as anticancer agents.
- These ligands can induce genome instability and activate innate immune genes.
- The relationship between G4 ligand properties and their biological effects is not fully understood.
Purpose of the Study:
- To investigate the molecular basis of immune stimulation by G4 ligands.
- To define the interplay between G4 affinity, cytotoxicity, and immune gene activation.
- To establish a new rationale for discovering effective anticancer G4 ligands.
Main Methods:
- Synthesis and evaluation of closely related hydrazone derivatives.
- Assessment of G4 ligand affinity and selectivity.
- Measurement of cytotoxicity, genome instability, and innate immune gene activation.
Main Results:
- Hydrazone derivatives exhibited varying G4 affinity, cytotoxicity, and immune activation.
- High G4 ligand affinity is crucial for immune gene activation.
- High cytotoxicity interferes with immune gene activation.
Conclusions:
- The balance between G4 stabilization and cytotoxicity determines immune gene activation levels.
- A strategy focusing on low cytotoxicity and high immune stimulation is proposed for developing novel G4 anticancer ligands.
