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What's special about secretory lysosomes?
1Sir William Dunn School of Pathology, University of Oxford, South Parks Road, OX1 3RE, Oxford, UK. gillian.griffiths@path.ox.ac.uk
Seminars in Cell & Developmental Biology
|September 24, 2002
Summary
Secretory lysosomes are specialized organelles that release contents upon stimulation. Even conventional lysosomes can fuse with the plasma membrane, but unique components define secretory lysosome function.
Area of Science:
- Cell Biology
- Organelle Function
Background:
- Lysosomes are primarily known for intracellular protein degradation.
- Some cell types utilize lysosomes as regulated secretory organelles.
- Secretory lysosomes package and release products upon extracellular stimuli.
Purpose of the Study:
- To investigate the unique components and functions of secretory lysosomes.
- To differentiate secretory lysosomes from conventional lysosomes.
Main Methods:
- Analysis of unique secretory machinery components in specialized cells.
- Comparison of lysosome behavior in secretory versus non-secretory cell types.
Main Results:
- Secretory lysosomes possess unique machinery for regulated secretion.
- Conventional lysosomes can also fuse with the plasma membrane, particularly in response to damage.
- The specialized components distinguish the regulated secretory role of secretory lysosomes.
Conclusions:
- Secretory lysosomes have distinct molecular components enabling regulated secretion.
- While conventional lysosomes exhibit plasma membrane fusion, it differs from the specialized secretory pathway.