Reversibly Migratable Fluorescent Probe for Precise and Dynamic Evaluation of Cell Mitochondrial Membrane Potentials

Area of Science:

• Biochemistry
• Cell Biology
• Medical Diagnostics

Background:

• Mitochondrial membrane potential (MMP) is crucial for cellular health and disease progression.
• Current MMP fluorescent probes suffer from poor photostability, limiting long-term monitoring.
• Accurate MMP monitoring is vital for pathological studies and drug development.

Purpose of the Study:

• To develop a novel fluorescent probe for dynamic and long-term evaluation of MMP.
• To overcome the limitations of existing probes, particularly photostability issues.
• To enable real-time monitoring of MMP changes in various cellular conditions.

Main Methods:

• Development of a pyrrolyl quinolinium (PQ) based fluorescent probe.
• Demonstration of PQ's reversible translocation between mitochondria and nucleoli in response to MMP changes.
• Utilizing the cytoplasm to nucleolus fluorescence intensity ratio for MMP quantification.
• Long-term dynamic evaluation of MMP in HeLa cells under oxidative stress.

Main Results:

• The PQ probe exhibits MMP-responsive, reversible translocation from mitochondria to nucleoli.
• The cytoplasm to nucleolus fluorescence intensity ratio directly correlates with MMP levels.
• The method provides stable and reliable real-time MMP monitoring, independent of photostability.
• Successful long-term dynamic MMP evaluation was achieved in HeLa cells.

Conclusions:

• The developed PQ probe offers a robust solution for dynamic MMP monitoring, overcoming photostability limitations.
• This probe facilitates real-time assessment of cellular health and mitochondrial function.
• The study is expected to advance mitochondria-related disease diagnosis and drug screening efforts.