Mobilization of iron from cells by hydroxyquinoline-based chelators

Area of Science:

• Medicinal Chemistry
• Biochemistry
• Cell Biology

Background:

• Iron (Fe) is essential for cellular function, but its dysregulation is implicated in various diseases.
• Developing effective iron chelators for therapeutic intervention is a significant area of research.

Purpose of the Study:

• To synthesize and evaluate novel hexadentate ligands (C1 and C2) for their ability to chelate and mobilize intracellular iron.
• To assess the efficacy and toxicity of these ligands in cellular models.

Main Methods:

• Synthesis of two novel hydroxyquinoline-based hexadentate ligands, C1 and C2.
• Evaluation of ligand lipophilicity and their iron(III) complexes.
• Assessment of ligand toxicity in K562 cells, with and without holotransferrin supplementation.
• Measurement of 59Fe mobilization from reticulocytes and K562 cells using micromolar concentrations of C1 and C2.

Main Results:

• Both C1 and C2 demonstrated effective mobilization of intracellular iron (59Fe) from reticulocytes and K562 cells at micromolar concentrations.
• C1 induced 60% 59Fe release from reticulocytes, while C2 induced 50% release under similar conditions.
• Ligands exhibited toxicity to K562 cells, partially alleviated by holotransferrin, suggesting iron depletion as a mechanism.

Conclusions:

• The novel ligands C1 and C2 are effective intracellular iron chelators.
• Their demonstrated efficacy at low concentrations suggests potential for therapeutic applications.
• Further in vivo studies are warranted to explore their oral activity and therapeutic utility.