Tracking Plasma Membrane Damage Using a Ruthenium(II) Complex Phosphorescent Indicator Paired with Cholesterol

Area of Science:

• Biomedical Imaging
• Cell Biology
• Materials Science

Background:

• Long-term in situ imaging of plasma membranes is crucial for understanding cellular processes like apoptosis.
• Existing membrane probes are limited in monitoring in situ plasma membrane damage.

Purpose of the Study:

• To develop a novel phosphorescent probe for effective plasma membrane staining and damage monitoring.
• To evaluate the probe's utility in real-time tracking of apoptosis and differentiating cell types.

Main Methods:

• Synthesis of a transition-metal complex phosphorescent indicator, Ru-Chol, paired with cholesterol.
• Assessment of Ru-Chol's properties: antipermeability, photostability, Stokes shift, and luminescence lifetime.
• Application of Ru-Chol for real-time imaging of cisplatin-induced plasma membrane damage and apoptosis.

Main Results:

• Ru-Chol demonstrated excellent plasma membrane staining with superior antipermeability and photostability.
• The probe exhibited a large Stokes shift and long luminescence lifetime, ideal for imaging.
• Ru-Chol successfully differentiated cancerous from normal cells and tracked apoptosis progression in real time.

Conclusions:

• Ru-Chol serves as an efficient tool for monitoring plasma membrane dynamics and damage.
• The probe facilitates drug screening and aids in the early diagnosis and treatment of diseases like tumors and diabetes.