Neddylation regulates the development and function of glutamatergic neurons

Area of Science:

• Neuroscience
• Molecular Biology
• Cell Biology

Background:

• Protein post-translational modifications (PTMs) regulate neuronal development and function.
• Ubiquitin-like modifiers (Ubls), including Nedd8, are less understood PTMs compared to phosphorylation or ubiquitination.
• Neddylation's role in nerve cells, particularly glutamatergic neurons, remains largely enigmatic.

Purpose of the Study:

• To investigate the function of Nedd8 conjugation (neddylation) in post-mitotic glutamatergic neurons.
• To elucidate the consequences of Nedd8 deficiency on neuronal differentiation and phenotype development.

Main Methods:

• Generation of a conditional Nedd8 knock-out mouse line.
• Culturing and examination of post-mitotic glutamatergic neurons from Nedd8-deficient mice.
• Analysis of gene expression, dendritic complexity, and synaptic transmission.

Main Results:

• Nedd8 ablation in young glutamatergic neurons altered developmental transcription factor expression.
• Defects observed include increased vGlut2, reduced vGlut1 and endophilin1 expression.
• Reduced dendrite complexity and increased transmitter release probability were noted.

Conclusions:

• Neddylation plays a pivotal role in determining the fate of glutamatergic neurons.
• Neddylation is essential for the proper development of a mature glutamatergic neuronal phenotype.
• Disruption of neddylation impacts excitatory synaptic transmission and neuronal function.