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ROS signaling during granzyme B-mediated apoptosis
1Department of Cell Physiology and Metabolism CMU; Geneva University ; Geneva,, Switzerland.
Molecular & Cellular Oncology
|June 17, 2016
Summary
Reactive oxygen species (ROS) are key in cell processes, but their role in apoptosis was debated. New findings reveal granzyme B triggers ROS-dependent apoptosis by disrupting the respiratory chain.
Area of Science:
- Cellular biology
- Immunology
- Biochemistry
Background:
- Reactive oxygen species (ROS) are implicated in cell signaling, aging, and cancer.
- The precise role of ROS in apoptosis, as either bystanders or active effectors, remained unclear.
Purpose of the Study:
- To elucidate the mechanism by which granzyme B induces apoptosis.
- To determine if ROS are actively involved in granzyme B-mediated cell death.
Main Methods:
- Investigated the biochemical pathway activated by granzyme B.
- Focused on the role of the mitochondrial respiratory chain and ROS production.
Main Results:
- Granzyme B activates a conserved pathway leading to apoptosis.
- This pathway involves the disruption of the mitochondrial respiratory chain.
- Mitocentric ROS production is a critical effector mechanism in this apoptosis pathway.
Conclusions:
- Granzyme B actively triggers apoptosis through a ROS-dependent mechanism.
- The findings clarify the role of ROS as active effectors in programmed cell death.
- This provides new insights into immune cell-mediated cytotoxicity and cancer biology.
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