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Live-cell Imaging of Lysosomal Membrane Permeabilization During Necroptosis
Published on: November 14, 2025
Stat3 controls lysosomal-mediated cell death in vivo
Peter A Kreuzaler1, Anna D Staniszewska, Wenjing Li
1Department of Pathology, University of Cambridge, Tennis Court Road, Cambridge CB2 1QP, UK.
Nature Cell Biology
|February 22, 2011
Summary
Physiological cell death in mammary glands involves lysosomal membrane permeabilization (LMP) and is regulated by Stat3. This pathway, distinct from apoptosis, offers new therapeutic targets for cancers involving cathepsins and Stat3.
Area of Science:
- Cell Biology
- Physiology
- Molecular Biology
Background:
- Lysosomes are known to mediate cell death, often through lysosomal membrane permeabilization (LMP).
- Lysosomal cell death pathways are typically studied in vitro or in pathological contexts.
- The physiological role of lysosomal cell death in tissue remodeling remains largely unexplored.
Purpose of the Study:
- To investigate the role of lysosomal cell death during physiological mammary gland involution.
- To elucidate the molecular mechanisms underlying this non-apoptotic cell death pathway.
Main Methods:
- Analysis of mammary gland tissue during post-lactational involution.
- Assessment of lysosomal membrane permeabilization (LMP) in mammary epithelial cells.
- Investigation of the involvement of caspases, Stat3, cathepsins, and Spi2A.
Main Results:
- Mammary gland involution involves widespread LMP in epithelial cells.
- This LMP-mediated cell death is independent of executioner caspases (3, 6, 7).
- Stat3 activation upregulates cathepsin B/L and downregulates Spi2A, mediating the cell death.
Conclusions:
- A novel, Stat3-regulated lysosomal cell death pathway operates during physiological mammary gland involution.
- This pathway represents a non-classical mechanism of programmed cell death.
- Findings have implications for treating cancers with overexpressed cathepsins and Stat3, such as breast, colon, and liver cancers.
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