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Updated: Aug 24, 2026
Studying Cell Death Initiation Using a Digital Microscope
Published on: November 10, 2023
Recent advances in the imaging of programmed cell death
1Stanford University School of Medicine, Division of Pediatric Radiology, Lucile Salter Packard Children's Hospital, Clinic F, Rm # 1673, 725 Welch Road, Palo Alto, CA 94304, USA. blankenb@stanford.edu
Abstract:
A deficiency or an excess of programmed cell death (apoptosis) is an integral component of autoimmune disorders, organ and bone marrow transplant rejection, and cancer. A technique to image programmed cell death would be useful in the development of drugs to treat these and others diseases, and to monitor the effectiveness of therapy. 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 of this agent in vivo is unclear and needs further study. Other agents are also underdevelopment including radiolabeled forms of Z-VAD.fmk, a potent inhibitor of the enzymatic cascade intimately associated with apoptosis. MR imaging techniques and tracers also hold promise as methods to monitor apoptotic cell death. In this article we will review these and other imaging technologies for the non-invasive imaging of cell death. The mechanism(s) and latest data on the conditions in which cellular stress and early apoptosis occur will also be discussed in detail including potential new strategies for the targeting and novel therapeutic interventions of tissues and organs undergoing stress or apoptosis when cell salvage is still possible.
Insights
Imaging programmed cell death (apoptosis) aids disease treatment and therapy monitoring. Current methods like radiolabeled annexin V show promise, but further research into uptake mechanisms and new imaging agents is needed.
Area of Science:
- Biomedical Imaging
- Molecular Biology
- Pathology
Background:
- Programmed cell death (apoptosis) dysregulation is central to autoimmune diseases, transplant rejection, and cancer.
- Effective imaging of apoptosis is crucial for developing targeted therapies and monitoring treatment efficacy.
Purpose of the Study:
- To review current and emerging imaging technologies for non-invasively monitoring cell death.
- To discuss the mechanisms of apoptosis and cellular stress.
- To explore novel strategies for therapeutic intervention in stressed or apoptotic tissues.
Main Methods:
- Review of existing literature on apoptosis imaging agents, including radiolabeled annexin V and Z-VAD.fmk.
- Discussion of Magnetic Resonance (MR) imaging techniques and tracers for apoptosis detection.
- Analysis of mechanisms underlying cellular stress and early apoptosis.
Main Results:
- Annexin V, labeled with technetium-99m, is a widely studied in vivo apoptosis imaging agent currently in clinical trials.
- The precise in vivo uptake mechanisms of annexin V require further investigation.
- Radiolabeled inhibitors like Z-VAD.fmk and MR imaging are promising alternative and complementary approaches.
Conclusions:
- Non-invasive imaging of apoptosis is vital for advancing treatments for various diseases.
- Continued research into imaging agent mechanisms and development of novel therapeutic strategies is essential for managing conditions involving cell death or stress.
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