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Thy-1 is a component common to multiple populations of synaptic vesicles
C J Jeng1, S A McCarroll, T F Martin
1Department of Neurobiology and Brain Research Institute, UCLA School of Medicine, Los Angeles, California 90095-1763, USA.
The Journal of Cell Biology
|March 14, 1998
Summary
Thy-1, a membrane protein, is found in secretory vesicles and plays a key role in neurotransmitter release from neurons. Antibodies targeting Thy-1 inhibit this release, highlighting its importance in synaptic function.
Area of Science:
- Neuroscience
- Cell Biology
- Molecular Biology
Background:
- Thy-1 is a glycosylphosphatidylinositol-linked integral membrane protein belonging to the immunoglobulin superfamily.
- Previously recognized primarily on the neuronal plasma membrane, its localization is now understood to extend to intracellular vesicles.
Purpose of the Study:
- To investigate the localization of Thy-1 within secretory vesicles in PC12 cells.
- To determine the functional role of Thy-1 in regulated neurotransmitter release.
Main Methods:
- Immunofluorescence and cell fractionation to determine Thy-1 localization in PC12 cells and rat CNS.
- Experiments using permeabilized PC12 cells treated with anti-Thy-1 antibodies to assess effects on neurotransmitter release.
Main Results:
- Thy-1 is localized to both large dense-core and small clear vesicles in PC12 cells, with a majority found in regulated secretory vesicles.
- Thy-1 is also present in synaptic vesicles in the rat central nervous system.
- Antibodies against Thy-1 inhibited regulated neurotransmitter release from permeabilized PC12 cells, independently of Ca2+ channel activity.
Conclusions:
- Thy-1 is an integral component of various regulated secretory vesicles.
- Thy-1 plays a significant role in the regulated release of neurotransmitters at the synapse.