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Investigating Functional Regeneration in Organotypic Spinal Cord Co-cultures Grown on Multi-electrode Arrays
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The Highly Localized Interaction between Neurofascin-186 and Gliomedin Promotes Subcellular Innervation by the
Yasufumi Hayano1,2,3, Yugo Ishino3, Manzoor A Bhat4
1Department of Pathology, The Ohio State University Wexner Medical Center, Columbus, Ohio 43210.
Summary
Neurofascin-186 and Gliomedin mediate synapse specificity between chandelier cells and pyramidal neurons. This ligand-receptor pair ensures inhibitory interneuron (IN) subtypes form precise connections in the brain.
Area of Science:
- Neuroscience
- Cell Biology
- Molecular Biology
Background:
- Cortical inhibitory interneurons (cINs) are crucial for brain computations.
- Subcellular synapse specificity of cINs determines their output properties.
- Molecular mechanisms for cIN synapse specificity are poorly understood.
Purpose of the Study:
- To investigate the molecular interactions enabling synapse formation between cIN subtypes and specific subcellular domains.
- To identify the molecules mediating chandelier cell (ChC) innervation of pyramidal neuron axon initial segments (AIS).
Main Methods:
- Utilized mouse models (both sexes).
- Investigated the roles of Neurofascin-186 (NF186) and Gliomedin in ChC synapse development.
- Examined the localization and function of NF186 and Gliomedin in ChC-AIS connections.
Main Results:
- Neurofascin-186 (NF186), expressed in pyramidal neuron AIS, is essential for ChC axon cartridge development.
- Gliomedin, preferentially expressed in ChCs, acts as a major receptor for NF186.
- This NF186-Gliomedin interaction mediates ChC innervation of the AIS.
Conclusions:
- The NF186-Gliomedin ligand-receptor pair establishes ChC subcellular synapse specificity.
- Subcellularly restricted molecular tags and cell type-specific receptors ensure precise cIN synaptic connections.
- This mechanism is fundamental for inhibitory regulation in cortical circuits.
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