Cellular Membrane-Targeted Europium(III) Probe for Selective and Time-Resolved Detection of Peroxynitrite

Area of Science:

• Chemistry
• Biochemistry
• Cell Biology

Background:

• Peroxynitrite (ONOO-) is a highly reactive molecule with significant biological impact.
• Accurate detection of ONOO- requires probes with high selectivity and specific subcellular localization.
• The cell membrane is a critical interface for ONOO- interactions, yet remains underexplored.

Purpose of the Study:

• To develop a novel probe for selective and localized detection of peroxynitrite (ONOO-) at the cell membrane.
• To investigate the role of membrane-localized ONOO- in biological processes and therapeutic interventions.

Main Methods:

• Synthesis of Eu.Chol, a luminescent europium(III) complex.
• Integration of a phenylboronic acid motif for ONOO- reactivity and a cholesterol anchor for membrane localization.
• Incorporation of Eu.Chol into liposomes and Jurkat cells for validation.

Main Results:

• Eu.Chol demonstrated efficient incorporation into liposomes and Jurkat cells.
• The probe enabled selective detection of membrane-localized ONOO-.
• Eu.Chol showed minimal cross-reactivity with hydrogen peroxide (H2O2).

Conclusions:

• Eu.Chol serves as a valuable tool for probing ONOO- dynamics at the cell membrane.
• The modular europium(III)-based scaffold allows for customization with organelle-specific targeting groups.
• This approach facilitates a deeper understanding of reactive oxygen and nitrogen species (RONS) in cellular environments.