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Lysosome-Related Effector Vesicles in T Lymphocytes and NK Cells
M Lettau1, D Kabelitz1, O Janssen1
1Institute of Immunology, University Hospital Schleswig-Holstein Campus Kiel, Kiel, Germany.
Scandinavian Journal of Immunology
|June 30, 2015
Summary
Cytotoxic effector cells utilize two distinct secretory lysosome types for targeted protein release. Light lysosomes mobilize FasL, while heavy lysosomes store perforin and granzymes for degranulation.
Area of Science:
- Immunology
- Cell Biology
Background:
- Lysosome-related secretory organelles possess metabolic and secretory functions.
- Hematopoietic cells use these organelles to store and secrete effector proteins.
Purpose of the Study:
- To investigate the distinct roles of secretory lysosomes in cytotoxic effector cells.
- To differentiate between lysosomal entities involved in FasL presentation versus degranulation.
Main Methods:
- Proteomic characterization of enriched organelles from T and NK cells.
- Biochemical and morphological analysis of lysosomal compartments.
Main Results:
- Two distinct lysosomal populations identified: light (FasL-associated) and heavy (granzyme, perforin, granulysin-containing).
- These organelles biochemically segregate and exhibit distinct morphologies.
- Evidence suggests differential mobilization based on cellular stimulation.
Conclusions:
- Cytotoxic effector cells may employ two distinct secretory lysosome types.
- This expands current models of cytotoxic effector function and immune response.
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