Fluorescent Probing of Labile Iron Dynamics in Biological Systems

The labile iron pool represents a transient reservoir of redox-active Fe(II) ions that participates in vital biochemical processes yet contributes to oxidative stress when misregulated. Fluorescent probing of this dynamic pool has emerged as a powerful approach to visualise spatiotemporal changes in cellular iron availability, overcoming the challenges posed by rapid metal exchange and the innate quenching properties of iron. Modern sensors combine a selective chemical trigger—such as an endoperoxide or N-oxide moiety—with a fluorogenic switch that turns on emission upon reaction with Fe(II). These designs afford high sensitivity, rapid kinetics and tailored spectral properties for multicolour imaging. By anchoring reactive intermediates or permanent dyes at sites of elevated labile iron, researchers can map subcellular iron flux during processes such as ferritin turnover, antioxidant response activation and hypoxia adaptation. Integration of fluorescent probes with live-cell microscopy has revealed metal-dependent vulnerabilities in cancer cells, hypoxic tumour niches and neurodegenerative models. Beyond fundamental insight, these tools enable screening of chelators, validation of redox-based therapies and the development of theranostic platforms that couple iron sensing with targeted intervention. As iron dyshomeostasis underlies disorders from anaemia to ferroptosis, fluorescent probes continue to refine our understanding of metal biology in health and disease.

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Fluorescent Probing of Labile Iron Dynamics in Biological Systems publication trend

The graph below shows the total number of articles in fluorescent probing of labile iron dynamics in biological systems across all publications each year (not limited to Nature Index journals).

Technical terms

Labile iron pool: A transient cellular reservoir of loosely bound Fe(II) that participates in metabolic reactions and redox cycling.

Fluorogenic probe: A molecule that generates a fluorescent signal only upon specific chemical interaction with its target, minimising background emission.

Ferritinophagy: The autophagic process by which ferritin is degraded to release stored iron into the labile pool.

Antioxidant response element (ARE): A DNA regulatory sequence that mediates transcriptional activation of genes controlling antioxidant and detoxification pathways.

References

1. A tandem activity-based sensing and labeling strategy reveals antioxidant response element regulation of labile iron pools. Proceedings of the National Academy of Sciences of the United States of America (2024).
2. A universal fluorogenic switch for Fe( ii ) ion based on N-oxide chemistry permits the visualization of intracellular redox equilibrium shift towards labile iron in hypoxic tumor cells. Chemical Science (2017).
3. Development of Chemical Tools for Imaging of Fe(II) Ions in Living Cells: A Review. Acta Histochemica et Cytochemica (2018).