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Fast hyperbaric decompression after heliox saturation altered the brain proteome in rats.

Alvhild Alette Bjørkum1, Eystein Oveland2,3, Linda Stuhr4

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Summary

Fast decompression after heliox saturation diving in rats altered the brain proteome, impacting synaptic vesicle function and protein homeostasis. This research offers insights into neurological symptoms of decompression sickness.

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Area of Science:

  • Neuroscience
  • Proteomics
  • Diving Physiology

Background:

  • Decompression sickness (DCS) poses risks to divers.
  • Understanding DCS's neurological effects is crucial for improving diving safety.

Purpose of the Study:

  • To investigate the impact of rapid heliox decompression on the rat brain proteome.
  • To identify specific proteins and pathways affected by fast decompression.

Main Methods:

  • Heliox saturation diving model in rats.
  • Comparison of fast decompression (1 bar/20 s) versus slow decompression (1 bar/10 min).
  • Quantitative proteomic analysis using iontrap and orbitrap LC-MS.

Main Results:

  • Significant alterations in brain proteome identified, with 56 proteins (iontrap) and 128 proteins (orbitrap) regulated.
  • Enrichment analysis revealed affected networks: synaptic vesicle fusion/recycling and translation initiation.
  • Key proteins like ribosomal proteins, hippocalcin-like protein 4, and proteasome subunit beta type-7 were upregulated; heat shock protein 105 kDa, Rho-associated protein kinase 2, and Dynamin-1 were downregulated.

Conclusions:

  • Fast decompression disrupts brain proteome, affecting protein homeostasis and synaptic vesicle function.
  • Potential implications for neurological disorders due to altered synaptic mechanisms.
  • Findings contribute to a better understanding of DCS pathophysiology.