Mechanism elucidation of cell-selective fluorescent probes

Area of Science:

• Chemical Biology
• Molecular Imaging
• Cell Biology

Background:

• Cell-selective fluorescent probes are vital for live-cell imaging and differentiating specific cell types.
• Small-molecule probes offer intracellular access, unlike extracellular antibody-based methods.
• Diverse biochemical features drive probe selectivity within cells.

Purpose of the Study:

• To categorize mechanisms of cell selectivity in fluorescent probes.
• To provide a framework for understanding probe action and design.
• To highlight the importance of mechanism-informed probe development.

Main Methods:

• Categorization of cell selectivity mechanisms into five principal strategies: protein-oriented, carbohydrate-oriented, lipid-oriented, gating-oriented, and metabolism-oriented.
• Discussion of representative examples for each mechanism.
• Outline of a decision-tree workflow for elucidating probe mechanisms.

Main Results:

• Five distinct strategies for achieving cell selectivity in fluorescent probes were identified.
• Each strategy leverages unique cellular traits like protein expression, membrane composition, transporter activity, or metabolic enzymes.
• A workflow for determining a probe's mechanism of action was proposed.

Conclusions:

• Understanding the mechanisms of cell selectivity is critical for advancing live-cell imaging.
• Mechanism-informed design is essential for developing effective therapeutic and research probes.
• This work facilitates precision cell targeting in biomedical applications.