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Published on: March 24, 2013
Imaging cell death in vivo
F Blankenberg1, C Mari, H W Strauss
1Department of Radiology, Stanford University School of Medicine, Stanford, CA, USA.
Abstract:
A technique to image programmed cell death would be useful both in clinical care and in drug development. The most widely studied agent for the in vivo study of apoptosis is radiolabeled annexin V, an endogenous protein labeled with technectium-99m, now undergoing clinical trials in both Europe and the United States. While annexin V has been studied extensively in humans the precise mechanism(s) of uptake this agent in vivo is unclear and needs further study. Other agents are also under development, including radiolabeled forms of Z-VAD.fmk, a potent inhibitor of the enzymatic cascade intimately associated with apoptosis. In addition other technologies, such as diffusion weighted magnetic resonance imaging and magnetic resonance imaging with contrast agents, such as small paramagnetic iron oxide particles coated with peptides have also been advocated as methods to monitor apoptotic cell death. The potential applications of imaging apoptosis as a marker of early response to therapy in cancer, acute cerebral and myocardial ischemic injury and infarction, immune mediated inflammatory disease and transplant rejection are reviewed.
Insights
Imaging programmed cell death, or apoptosis, is crucial for clinical care and drug development. Current methods like radiolabeled annexin V show promise, but further research is needed to understand their in vivo mechanisms.
Area of Science:
- Biomedical imaging
- Molecular imaging
- Cellular biology
Background:
- Apoptosis imaging is vital for clinical care and drug development.
- Radiolabeled annexin V is a key agent for in vivo apoptosis studies, currently in clinical trials.
- The precise in vivo uptake mechanisms of annexin V require further investigation.
Purpose of the Study:
- To review current and developing techniques for imaging programmed cell death (apoptosis).
- To discuss the potential applications of apoptosis imaging in various medical conditions.
- To highlight the need for further research into the mechanisms of apoptosis imaging agents.
Main Methods:
- Review of existing literature on apoptosis imaging agents and technologies.
- Discussion of radiolabeled annexin V and its clinical status.
- Exploration of emerging agents like radiolabeled Z-VAD.fmk and advanced MRI techniques.
Main Results:
- Annexin V is extensively studied but its in vivo mechanism is unclear.
- Other agents and technologies like Z-VAD.fmk and MRI are under development.
- Apoptosis imaging has potential applications in cancer, ischemia, and inflammatory diseases.
Conclusions:
- Effective imaging of apoptosis is essential for advancing medical diagnostics and therapeutics.
- Continued research into imaging agents and mechanisms will enhance clinical utility.
- Apoptosis imaging holds significant promise for monitoring treatment response and disease progression.
