Related Experiment Videos
A novel RING-H2 motif protein downregulated by axotomy: its characteristic localization at the postsynaptic density
M Nakayama1, T Miyake, Y Gahara
1Shionogi Research Laboratories, Shionogi and Co., Ltd., Osaka, Japan.
Abstract:
Axonal injury and its repair are common and basic neuropathological processes in the CNS, and are composed of a complex of events in a molecular term. In order to get a comprehensive understanding of these processes, we isolated several known and unknown genes which were up-or downregulated in the facial nucleus after transection of the facial nerve by a subtractive/differential screening. Among them, we focus on one downregulated gene, named Neurodap1, because this gene encodes a novel protein carrying the RING-H2 sequence motif categorized in the zinc finger family. Immunoelectron microscopic analysis revealed that the protein encoded by Neurodap1, Neurodap1, was distributed mainly on the cytoplasmic side of the membranes constituting endoplasmic reticulum and Golgi apparatus, supporting the notion of a previously postulated function of RING-H2 motif proteins, that is, involvement in the protein sorting machinery. More interestingly, Neurodap1 was also bound to the postsynaptic density (PSD) region of axosomatic synapses. This fact suggests that Neurodap1 is associated with a specific system sorting proteins to PSD. Therefore, Neurodap1, a newly identified protein as an axotomy-suppressed gene product, might play a significant role in synaptic communication and plasticity through the control of the formation of PSD for maintaining vital functions of nerve cells.
Insights
Researchers identified Neurodap1, a novel protein involved in central nervous system repair after axonal injury. This protein may play a key role in synaptic plasticity and nerve cell function.
Area of Science:
- Neuroscience
- Molecular Biology
- Cell Biology
Background:
- Axonal injury and repair are fundamental neuropathological processes in the central nervous system (CNS).
- Understanding the molecular events underlying these processes is crucial for developing therapeutic strategies.
Purpose of the Study:
- To identify novel genes involved in the molecular response to axonal injury.
- To characterize the function and localization of a newly identified downregulated gene, Neurodap1.
Main Methods:
- Subtractive/differential gene screening to identify differentially expressed genes after facial nerve transection.
- Immunoelectron microscopy to determine the subcellular localization of the NeuroDap1 protein.
Main Results:
- Neurodap1, a novel gene downregulated after axotomy, encodes a protein with a RING-H2 motif, characteristic of zinc finger proteins.
- NeuroDap1 protein localizes to the endoplasmic reticulum and Golgi apparatus, suggesting a role in protein sorting.
- NeuroDap1 was also found in the postsynaptic density (PSD) region, indicating involvement in synaptic protein targeting.
Conclusions:
- NeuroDap1 is a novel axotomy-suppressed gene product with a potential role in protein sorting machinery.
- Its presence in the PSD suggests NeuroDap1 is involved in targeting proteins to this region.
- NeuroDap1 may significantly influence synaptic communication and plasticity by regulating PSD formation, thereby maintaining neuronal function.