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Xenopus laevis as a Model to Identify Translation Impairment
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Translational and Posttranslational Dynamics in a Model Peptidergic System.

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Molecular & Cellular Proteomics : MCP
|April 8, 2023
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Summary

Neuronal stimulation causes distinct proteome and phosphoproteome changes in cell bodies versus axons. This highlights compartment-specific adaptations for cytoskeletal and secretory functions in magnocellular neurons.

Keywords:
Axonal terminalCell bodyCytoskeletonMagnocellular neuronesPhosphoproteomeProteomeSynapse

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Proteomics

Background:

  • Hypothalamic magnocellular neurons possess a unique structure with cell bodies in the supraoptic nucleus and axons extending to the posterior pituitary.
  • Understanding neuronal compartment-specific responses is crucial for deciphering complex physiological processes.

Purpose of the Study:

  • To investigate the distinct proteome and phosphoproteome dynamics in neuronal cell bodies and axonal terminals of magnocellular neurons upon physiological stimulation.
  • To elucidate the functional adaptations occurring in different neuronal compartments.

Main Methods:

  • Utilized a combination of proteomic and phosphoproteomic analyses.
  • Integrated transcriptome and proteomic data for multiomic analysis.
  • Focused on hypothalamic magnocellular neurons and their projection to the posterior pituitary.

Main Results:

  • Demonstrated significant differences in proteome and phosphoproteome responses between neuronal cell bodies and axonal terminals.
  • Identified compartment-specific adaptations: cell body changes relate to cytoskeletal reorganization, while axonal terminal changes involve synaptic and secretory processes.
  • Observed phosphorylation and hyperphosphorylation of prohormone precursors (vasopressin, oxytocin) in axonal terminals post-stimulation.
  • Multiomic integration revealed changes in proteins within afferent inputs to the supraoptic nucleus.

Conclusions:

  • Neuronal stimulation elicits differential proteomic and phosphoproteomic adaptations in distinct cellular compartments.
  • Axonal terminals play a key role in regulating synaptic and secretory functions, including prohormone processing.
  • The study provides insights into the molecular mechanisms underlying neuronal function and adaptation in magnocellular systems.