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Cellular interrelationships during laminar segregation in the dorsal lateral geniculate nucleus
J K Brunso-Bechtold1, S L Vinsant
1Department of Anatomy, Bowman Gray School of Medicine, Winston-Salem, North Carolina 27103.
Summary
Cellular adhesion, not gap junctions, appears crucial for forming layers in the developing dorsal lateral geniculate nucleus (dLGN). Puncta adherentes and interdigitated processes are key, suggesting cell-cell interactions guide neural development.
Area of Science:
- Neuroscience
- Developmental Biology
- Cell Biology
Background:
- Understanding the mechanisms of cell grouping in the developing nervous system is essential for insights into neural circuit formation.
- The dorsal lateral geniculate nucleus (dLGN) provides a model system for studying the development of functionally distinct cell layers.
Purpose of the Study:
- To investigate the role of cell adhesion and intercellular connections in the laminar segregation of the developing dLGN.
- To examine ultrastructural changes during the formation of neural layers in the dLGN of tree shrews.
Main Methods:
- Comparative ultrastructural analysis of the dLGN in tree shrews at various developmental stages (P0, P4, P7, P15) and in adults.
- Focused on identifying intercellular junctions, cytoplasmic bridges, interdigitated processes, and glial cell ultrastructure.
Main Results:
- Absence of gap junctions between neurons and in the neuropil across all developmental stages.
- Frequent observation of puncta adherentes between adjacent neurons and between neurons and neuropil elements.
- Presence of subsurface cisternae, cytoplasmic bridges (rare, transient), and interdigitated cytoplasmic processes.
Conclusions:
- Cellular adhesion, mediated by puncta adherentes and interdigitated processes, likely plays a significant role in the laminar segregation of the dLGN.
- Gap junctions do not appear to be involved in this process.
- The role of glial cells requires further investigation.