ErbB signaling has a role in radial sorting independent of Schwann cell number
- Authors
- Raphael, A.R., Lyons, D.A., and Talbot, W.S.
- ID
- ZDB-PUB-110518-1
- Date
- 2011
- Source
- Glia 59(7): 1047-1055 (Journal)
- Registered Authors
- Lyons, David A., Raphael, Alya, Talbot, William S.
- Keywords
- Schwann cell, zebrafish, radial sorting, ErbB signaling
- MeSH Terms
-
- Acridine Orange
- Schwann Cells/drug effects
- Schwann Cells/metabolism*
- Schwann Cells/ultrastructure
- Forkhead Transcription Factors/genetics
- Statistics, Nonparametric
- Lateral Line System/cytology
- Lateral Line System/drug effects
- Lateral Line System/physiology
- Oncogene Proteins v-erbB/metabolism*
- Early Growth Response Protein 2/metabolism
- Enzyme Inhibitors/pharmacology
- Tubulin/metabolism
- Myelin Sheath/metabolism
- Signal Transduction/drug effects
- Signal Transduction/physiology*
- Zebrafish Proteins/genetics
- Cell Movement/physiology
- Microscopy, Electron, Transmission
- Green Fluorescent Proteins/genetics
- Myelin Basic Protein/metabolism
- Gene Expression Regulation, Developmental/drug effects
- Organic Cation Transport Proteins/metabolism
- Animals, Genetically Modified
- Microscopy, Confocal/methods
- Cell Count
- Cell Proliferation*/drug effects
- Animals
- Axons/drug effects
- Axons/metabolism
- Zebrafish
- Embryo, Nonmammalian
- PubMed
- 21491500 Full text @ Glia
In the peripheral nervous system, Schwann cells make myelin, a specialized sheath that is essential for rapid axonal conduction of action potentials. Immature Schwann cells initially interact with many axons, but, through a process termed radial sorting, eventually interact with one segment of a single axon as promyelinating Schwann cells. Previous studies have identified genes that are required for Schwann cell process extension and proliferation during radial sorting. Previous analyses also show that ErbB signaling is required for Schwann cell proliferation, myelination, radial sorting, and the proper formation of unmyelinated Remak bundles. Because ErbB signaling and Schwann cell proliferation are both required during radial sorting, we sought to determine if the primary function of ErbB signaling in this process is to regulate Schwann cell proliferation or if ErbB signaling also controls other aspects of radial sorting. To address this question, we applied small molecule inhibitors in vivo in zebrafish to independently block ErbB signaling and proliferation. Ultrastructural analysis of treated animals revealed that both ErbB signaling and Schwann cell proliferation are required for radial sorting in vivo. ErbB signaling, however, is required for Schwann cell process extension, while Schwann cell proliferation is not. These results provide in vivo evidence that ErbB signaling plays a direct role in process extension during radial sorting, in addition to its role in regulating Schwann cell proliferation.