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Early development of rat ventral root transitional zone: an immunohistochemical and morphometric study
D O'Brien1, P Dockery, K McDermott
1Department of Anatomy and Biosciences Research Institute, University College, Cork, Ireland.
Journal of Neurocytology
|September 29, 2001
Summary
This study reveals key developmental changes in the rat
Area of Science:
- Neuroscience
- Developmental Biology
- Cell Biology
Background:
- Ventral motoneuron axons transition from the central nervous system (CNS) to the peripheral nervous system (PNS) through the transitional zone (TZ).
- Early differentiation of the TZ is crucial for establishing the CNS-PNS interface.
Purpose of the Study:
- To identify immunohistochemical and morphometric changes during early rat transitional zone (TZ) formation.
- To understand the cellular and molecular events that define the CNS-PNS interface.
Main Methods:
- Immunohistochemistry to analyze protein expression (vimentin, GFAP, HNK-1/N-CAM).
- Morphometric analysis of glial processes and cell clusters.
- Ultrastructural examination of the TZ.
Main Results:
- Embryonic day 18 (E18) marks the initiation of major TZ differentiation events.
- Differential expression of CNS and PNS markers (GFAP, HNK-1/N-CAM) defines the CNS-PNS interface.
- Formation of two barriers within the axon bundle by E18 and P2, potentially preventing Schwann cell invasion.
Conclusions:
- Early TZ development involves dynamic changes in glial markers and cell morphology.
- The formation of barriers by cluster cells and astrocytes is critical for CNS-PNS segregation.
- These findings enhance the understanding of TZ development and CNS-PNS interface formation.