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Updated: Jan 23, 2026
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Comprehensive Analysis of Procoagulant Platelets Exhibiting Features of Necrosis, Apoptosis and Platelet Activation
Published on: May 23, 2025
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Platelet Apoptosis Can Be Triggered Bypassing the Death Receptors
Valery Leytin1, Armen V Gyulkhandanyan1, John Freedman1,2,3
11 Toronto Platelet Immunobiology Group, St Michael's Hospital, Toronto, Ontario, Canada.
Summary
Platelet apoptosis can be triggered without death receptors, bypassing the extrinsic pathway. Instead, specific platelet receptors or agents like ABT-737 activate the intrinsic pathway, leading to programmed cell death.
Area of Science:
- Cellular Biology
- Hematology
- Immunology
Background:
- Programmed cell death (apoptosis) in nucleated cells typically initiates via the extrinsic pathway, involving death ligands and receptors.
- Platelets, anucleate cells, present a unique model for studying apoptosis due to their distinct cellular machinery.
Purpose of the Study:
- To review evidence on apoptosis induction in anucleate platelets.
- To explore mechanisms of platelet apoptosis that bypass conventional death receptor pathways.
Main Methods:
- Review of existing literature on platelet apoptosis.
- Analysis of studies investigating platelet surface receptors (e.g., PAR-1, GPIIbIIIa, GPIbα) in apoptosis.
- Examination of the effects of pro-apoptotic agents (e.g., ABT-737, calcium ionophore A23187) on platelet death pathways.
Main Results:
- Platelet apoptosis can be induced independently of death receptors, unlike nucleated cells.
- Specific platelet surface receptors involved in activation, aggregation, and coagulation mediate apoptosis.
- Agents like ABT-737 and A23187 trigger platelet apoptosis via the intrinsic pathway, targeting mitochondria.
Conclusions:
- Anucleate platelets utilize distinct apoptotic pathways compared to nucleated cells.
- Platelet surface receptors and targeted agents offer alternative routes to induce platelet apoptosis.
- Understanding these pathways is crucial for regulating platelet function and survival in various physiological and pathological conditions.
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