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A Click Chemistry Approach for Developing Organelle-Directed Photocytotoxic Ruthenium(II) Probes.

Creina Slator¹, Anna Ziemele¹, Eva Delahunt¹

¹School of Chemical Sciences, Dublin City University, Glasnevin, Dublin 9, Dublin D09 E432, Ireland.

Journal of Medicinal Chemistry

|May 12, 2026

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This summary is machine-generated.

Ruthenium(II) polypyridyl complexes were modified with triphenylphosphonium (TPP) vectors to improve cell membrane permeability for cellular imaging. These TPP-modified complexes show potential as DNA probes, localizing in mitochondria and exhibiting enhanced stability with specific ligand designs.

Area of Science:

Bioinorganic Chemistry
Cellular Imaging
Molecular Probes

Background:

Ruthenium(II) polypyridyl complexes are valuable for cellular imaging and sensing.
Limited cell membrane permeability hinders their in vivo applications.
Improving cellular uptake is crucial for developing effective biological probes.

Purpose of the Study:

To develop cell-permeable Ruthenium(II) probes for enhanced cellular imaging and sensing.
To investigate the cellular localization and DNA-binding capabilities of modified Ru(II) complexes.
To evaluate the impact of ligand design on probe stability and performance in biological environments.

Main Methods:

Utilizing click chemistry for biocompatible conjugation of azide-functionalized ligands with alkyne-modified triphenylphosphonium (TPP) vectors.

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Employing live-cell confocal fluorescence microscopy to determine cellular localization, particularly mitochondrial uptake.

Conducting spectroscopic solution studies and luminescence imaging to assess DNA intercalation and probe stability.

Main Results:

Successful synthesis of TPP-modified Ru(II) probes with improved membrane permeability.
Demonstrated mitochondrial localization of the TPP-conjugated Ru(II) complexes in live cells.
Evidence of DNA intercalation by TPP-modified Ru(II) conjugates, indicating potential as nucleic acid probes.
Ru-complexes with TPP-1,10-phenanthroline (TPP-phen) ligands exhibited superior environmental stability compared to TPP-dipyridophenazine (TPP-dppz) counterparts.

Conclusions:

TPP conjugation effectively enhances the cellular permeability of Ru(II) polypyridyl complexes.
These modified complexes can serve as potential DNA probes with significant mitochondrial localization.
Ligand design, specifically the choice between TPP-phen and TPP-dppz, critically influences probe stability and suitability for biological applications.