Photoswitchable imaging contrast agents as an emerging frontier in precision bioimaging

Area of Science:

• Molecular Imaging
• Photochemistry
• Biotechnology

Background:

• Photoswitchable molecules undergo reversible photoisomerization, enabling unique photophysical properties.
• Photoswitchable imaging contrast agents (PICAs) leverage these properties for enhanced bioimaging.
• PICAs offer advantages like background suppression, continuous imaging, and rapid signal modulation.

Purpose of the Study:

• To comprehensively analyze advancements and challenges of PICAs in bioimaging.
• To propose innovative molecular design and assembly strategies for PICA improvement.
• To summarize recent PICA progress across various imaging modalities.

Main Methods:

• Systematic evaluation of representative photoswitchable molecules as PICAs.
• Analysis of molecular design and assembly strategies to address limitations.
• Review of PICA applications in fluorescence, phosphorescence, photoacoustic, MRI, and Raman imaging.

Main Results:

• PICAs demonstrate significant potential for improving bioimaging quality and precision.
• Key challenges include hydrophobicity, short-wavelength excitation, and suboptimal emission.
• Progress has been made in diverse imaging techniques, enhancing diagnostic capabilities.

Conclusions:

• PICAs represent a promising frontier in bioimaging, offering superior performance over conventional agents.
• Overcoming current limitations through molecular design is crucial for widespread clinical adoption.
• Future PICA development will drive advancements in both preclinical research and clinical diagnostics.