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Multifunctional photosensitizer-based contrast agents for photoacoustic imaging
Chris Jun Hui Ho1, Ghayathri Balasundaram1, Wouter Driessen2
1Singapore Bioimaging Consortium, Agency for Science, Technology and Research, Singapore.
Scientific Reports
|June 19, 2014
Summary
This study shows that photosensitizers, used in photodynamic therapy (PDT), can effectively act as contrast agents for photoacoustic imaging. Zinc phthalocyanine demonstrated excellent tumor targeting and clearance in mice, highlighting their potential for cancer monitoring.
Area of Science:
- Biomedical Imaging
- Optical Imaging
- Ultrasound Imaging
Background:
- Photoacoustic imaging (PAI) is a hybrid modality merging optical resolution with ultrasound penetration.
- Photosensitizers (PSs) are used in photodynamic therapy (PDT) and show promise as PAI contrast agents.
- PAI offers advantages over fluorescence imaging, avoiding photobleaching and autofluorescence.
Purpose of the Study:
- To evaluate photosensitizers as contrast agents for photoacoustic imaging.
- To compare the photoacoustic activity of five common photosensitizers.
- To assess the in vivo tumor localization and biodistribution of the most active photosensitizer.
Main Methods:
- Tested five photosensitizers (zinc phthalocyanine, protoporphyrin IX, etc.) in phantoms for photoacoustic activity.
- Utilized photoacoustic imaging to evaluate tumor localization and biodistribution in a murine model.
- Administered zinc phthalocyanine and tracked its signal over time post-injection.
Main Results:
- Zinc phthalocyanine exhibited the highest photoacoustic activity among the tested photosensitizers.
- In vivo imaging showed rapid tumor localization (within 10 minutes) for zinc phthalocyanine.
- Peak accumulation occurred around 1 hour, with clearance within 24 hours.
Conclusions:
- Photosensitizers are effective photoacoustic contrast agents.
- Zinc phthalocyanine demonstrates excellent tumor targeting and clearance kinetics.
- This approach enables longitudinal monitoring of cancer progression and therapy using PAI.
