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Molecular afterglow imaging with bright, biodegradable polymer nanoparticles
Qingqing Miao1, Chen Xie1, Xu Zhen1
1School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore.
Nature Biotechnology
|October 17, 2017
Summary
New semiconducting polymer nanoparticles (SPNs) offer brighter, longer-lasting near-infrared afterglow for ultrasensitive in vivo imaging. These SPNs enable high-contrast detection of tumors and early toxicity in live animals.
Area of Science:
- Biomedical Imaging
- Materials Science
- Nanotechnology
Background:
- Afterglow optical agents promise ultrasensitive in vivo imaging by overcoming tissue autofluorescence.
- Current limitations include reliance on inorganic nanoparticles with low brightness and short near-infrared (NIR) emission.
Purpose of the Study:
- To develop novel semiconducting polymer nanoparticles (SPNs) for enhanced afterglow imaging.
- To demonstrate the potential of SPNs for in vivo imaging and early disease detection.
Main Methods:
- Synthesized semiconducting polymer nanoparticles (SPNs) with diameters <40 nm.
- Characterized SPN afterglow luminescence at 780 nm with a half-life of ~6 min.
- Evaluated SPN performance in vivo for lymph node, tumor imaging, and hepatotoxicity detection in mice.
Main Results:
- SPNs exhibited over 100-fold greater in vivo afterglow intensity compared to inorganic agents.
- Achieved high-contrast imaging with signal-to-background ratios up to 127x higher than NIR fluorescence imaging.
- Demonstrated early detection of drug-induced hepatotoxicity using a biothiol-activated afterglow probe.
Conclusions:
- SPNs represent a significant advancement in afterglow imaging technology, offering superior brightness and emission properties.
- The developed SPNs enable high-contrast visualization of biological structures and early disease detection in vivo.
- This technology holds promise for improved diagnostic capabilities in preclinical research.