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Identification of a synaptic vesicle antigen (Mr 86,000) conserved between Torpedo and rat
Abstract:
Antisera were raised in guinea pigs to synaptic vesicles purified from the electric organ of Torpedo marmorata. In cholinergic nerve terminals from Torpedo the major antigens identified had Mr 300,000-150,000, 86,000, and 18,000. The Mr 86,000 antigen was conserved between Torpedo and rat, where it is neuron-specific and concentrated in nerve terminals. When rat brain synaptosomes are subfractionated the antigen is associated with synaptic vesicles. The antigen is not found in the cytoskeleton and in the vesicle-free cytosol. Immunohistochemical localization of the antigen in rat shows it to be associated with synapses in diaphragm, cerebellum, hippocampus, and cerebral cortex. The staining pattern of the antigen indicates that the antigen is not cholinergic-specific. The function of the Mr 86,000 antigen remains to be identified.
Insights
Researchers identified a key 86,000 molecular weight (Mr) antigen in synaptic vesicles, conserved across species and concentrated in nerve terminals. Its specific function in neuronal synapses remains to be determined.
Area of Science:
- Neuroscience
- Molecular Biology
- Immunology
Background:
- Synaptic vesicles are crucial for neurotransmission.
- Identifying their protein components is key to understanding neuronal function.
Purpose of the Study:
- To identify major antigens within synaptic vesicles from Torpedo electric organ.
- To characterize a conserved 86,000 Mr antigen in rat neuronal tissues.
Main Methods:
- Antisera generation in guinea pigs against purified synaptic vesicles.
- Protein antigen identification using molecular weight (Mr) analysis.
- Immunohistochemical localization in rat brain and diaphragm tissues.
Main Results:
- Identified major Torpedo synaptic vesicle antigens at Mr 300,000-150,000, 86,000, and 18,000.
- The Mr 86,000 antigen is neuron-specific, concentrated in nerve terminals, and associated with synaptic vesicles in rat brain.
- Immunohistochemistry revealed widespread synaptic localization in rat, not limited to cholinergic neurons.
Conclusions:
- A conserved Mr 86,000 antigen is a significant component of synaptic vesicles in both Torpedo and rat.
- This antigen is neuron-specific and localized to synapses, but its function is currently unknown.