Self-Immolative Dye-Doped Polymeric Probe for Precisely Imaging Hydroxyl Radicals by Avoiding Leakage

Area of Science:

• Biomedical Engineering
• Polymer Chemistry
• Analytical Chemistry

Background:

• Nanocarriers with dyes amplify biomarker signals but suffer from non-specific dye leakage, causing false positives.
• Accurate detection of low-abundance biomarkers requires strategies to prevent signal interference in biological environments.

Purpose of the Study:

• To develop a novel signal amplification strategy using a self-immolative dye-doped polymeric probe (SDPP) to overcome dye leakage and false positives.
• To create a prototype SDPP for sensitive and specific detection of hydroxyl radicals (•OH).

Main Methods:

• Covalently integrating dyes into the polymer backbone to form the SDPP structure.
• Fabricating a prototype SDPP responsive to hydroxyl radicals (•OH).
• Utilizing a self-immolative reaction triggered by •OH to release dyes for fluorescence signal amplification.

Main Results:

• The SDPP successfully prevented non-specific dye leakage in biological conditions.
• SDPP precisely tracked intracellular basal •OH levels and visualized •OH in vivo associated with myocarditis.
• The developed probe demonstrated superior performance compared to traditional dye-loaded nanoprobes.

Conclusions:

• SDPP offers a reliable method for signal amplification, avoiding false positives in biomarker detection.
• This approach provides a valuable molecular tool for investigating the role of •OH in cardiopathy.
• The study presents a new direction for developing precise intracellular molecular detection strategies.