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Updated: May 23, 2026
Synthesis of an In vivo MRI-detectable Apoptosis Probe
Published on: July 31, 2012
Design of "smart" probes for optical imaging of apoptosis
Xinglu Huang1, Seulki Lee, Xiaoyuan Chen
1Laboratory of Molecular Imaging and Nanomedicine (LOMIN), National Institute of Biomedical Imaging and Bioengineering (NIBIB), Bethesda, MD, USA.
Abstract:
Apoptosis is a mode of programmed cell death in multicellular organisms and plays a central role in controlling embryonic development, growth and differentiation and monitoring the induction of tumor cell death through anticancer therapy. Since the most effective chemotherapeutics rely on apoptosis, imaging apoptotic processes can be an invaluable tool to monitor therapeutic intervention and discover new drugs modulating apoptosis. The most attractive target for developing specific apoptosis imaging probes is caspases, crucial mediators of apoptosis. Up to now, various optical imaging strategies for apoptosis have been developed as an easy and economical modality. However, current optical applications are limited by poor sensitivity and specificity. A subset of molecular imaging contrast agents known as "activatable" or "smart" molecular probes allow for very high signal-to-background ratios compared to conventional targeted contrast agents and open up the possibility of imaging intracellular targets. In this review, we will discuss the unique design strategies and applications of activatable probes recently developed for fluorescence and bioluminescence imaging of caspase activity.
Insights
Activatable probes offer enhanced sensitivity and specificity for imaging apoptosis, a critical process in development and cancer therapy. These smart probes target caspases, key mediators of programmed cell death, improving monitoring of anticancer treatments.
Area of Science:
- Biomedical imaging
- Molecular biology
- Cellular processes
Background:
- Apoptosis, or programmed cell death, is vital for multicellular organism development and tumor suppression.
- Effective cancer chemotherapeutics often induce apoptosis, making its imaging crucial for treatment monitoring and drug discovery.
- Current optical imaging methods for apoptosis lack sensitivity and specificity.
Purpose of the Study:
- To review the design strategies and applications of activatable molecular probes for imaging caspase activity.
- To highlight advancements in fluorescence and bioluminescence imaging of apoptosis.
- To discuss the potential of smart probes for improved intracellular target visualization.
Main Methods:
- Review of recent literature on activatable probes for apoptosis imaging.
- Focus on probes targeting caspases, central mediators of apoptosis.
- Discussion of fluorescence and bioluminescence imaging techniques.
Main Results:
- Activatable probes offer superior signal-to-background ratios compared to conventional agents.
- These probes enable sensitive and specific imaging of intracellular caspase activity.
- Recent developments show promise for improved apoptosis visualization.
Conclusions:
- Activatable probes represent a significant advancement in apoptosis imaging.
- They enhance the monitoring of therapeutic interventions and drug discovery for apoptosis-modulating agents.
- Future applications include more precise intracellular target imaging.
