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Comparative studies on synaptosomes: Applicability of the rapid method for preparing synaptosomes to elasmobranch
E J Simon1, V P Whittaker, H Meilman
1Marine Biological Laboratory, 02543, Woods Hole, Massachusetts.
Neurochemical Research
|November 26, 2013
Summary
A rapid flotation technique effectively isolates well-sealed synaptosomes from dogfish brain tissue. This method, adapted from invertebrate studies, offers a quick preparation for metabolic research.
Area of Science:
- Neuroscience
- Biochemistry
Background:
- Synaptosomes are crucial for studying neuronal function and neurotransmitter release.
- Existing methods for synaptosome preparation can be time-consuming and may affect their integrity.
Purpose of the Study:
- To adapt and validate a rapid flotation technique for preparing synaptosomes from elasmobranch fish (Mustelis canis) nervous tissue.
- To assess the quality and sealing of synaptosomes prepared using this method.
Main Methods:
- A flotation technique was applied to homogenized dogfish brain tissue.
- Differential centrifugation was used to obtain a supernatant.
- Intermediate centrifugal fields (10^6 g/min) were applied to separate synaptosomes.
Main Results:
- The technique successfully separated well-sealed synaptosomes from less sealed ones.
- Sealed synaptosomes did not equilibrate with the 0.8 M sucrose homogenization medium.
- Synaptosome integrity was assessed via osmotic shrinkage, enzyme occlusion, and choline uptake.
Conclusions:
- The rapid flotation technique provides a fast (1-1.5 hr) and effective method for preparing high-quality synaptosomes from elasmobranch fish.
- These well-sealed synaptosomes are suitable for further metabolic studies.
