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Dendritic RNA and postsynaptic density formation in chick cerebellar synaptogenesis
E Palacios-Prü1, L Miranda-Contreras, R V Mendoza
1Centro de Microscopía Electrónica, Universidad de Los Andes, Mérida, Venezuela.
Neuroscience
|January 1, 1988
Summary
This study investigated the origin of postsynaptic densities (PSDs) in developing chick brains. Results suggest that ribosomes play a key role in PSD formation during cerebellar maturation.
Area of Science:
- Neuroscience
- Developmental Biology
- Cell Biology
Background:
- Postsynaptic densities (PSDs) are crucial protein complexes at neuronal synapses.
- Their developmental origin, particularly the role of ribosomes, remains an area of active research.
Purpose of the Study:
- To investigate the ribosomal origin of postsynaptic densities (PSDs) during chick cerebellar maturation.
- To implement and validate a new procedure for synaptosomal preparation for this investigation.
Main Methods:
- Embryonic chick cerebellar cortex (days 14-20) and young adult chicks were used.
- Mechanical dissociation and trypsin treatment were followed by Ficoll sucrose gradient centrifugation for synaptosomal fraction enrichment.
- RNA and protein content within synaptosomal fractions were quantified.
Main Results:
- Significant increases in RNA content per milligram of wet weight were observed, peaking at day 18 of embryonic development (616.7 ng/mg).
- The RNA/protein ratio also peaked at day 18 (329.8 µg/mg), correlating with peak synaptic formation.
- Young adult chicks showed lower RNA content and RNA/protein ratios compared to peak embryonic levels.
Conclusions:
- The findings support the hypothesis that ribosomes contribute to the formation of PSDs.
- The developmental timing of RNA accumulation aligns with the period of maximum synaptic development in the chick cerebellum.