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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Neuroscience

Background:

  • The conserved Blm10/PA200 proteins function as proteasome activators.
  • Previous studies identified PA200-enriched genomic regions and its redistribution upon mitochondrial inhibition.
  • PA200 was implicated in regulating cellular homeostasis at the transcriptional level.

Purpose of the Study:

  • To investigate the impact of stable PA200 depletion (shPA200) on the transcriptome of SH-SY5Y neuroblastoma cells.
  • To determine how PA200 deficiency affects cellular metabolism and mitochondrial function.
  • To explore the role of PA200 in response to ATP synthase inhibition.

Main Methods:

  • RNA-sequencing (RNA-seq) for transcriptome analysis.
  • Metabolic assays in live cells to assess respiration and glycolysis.
  • Mitochondrial morphology assessment.
  • Western blotting to analyze protein levels (Opa1, OMA1).

Main Results:

  • PA200 depletion caused significant changes in the transcriptional landscape, affecting genes involved in metabolism.
  • While basal respiration remained unchanged, spare respiratory capacity and proton leak were reduced in shPA200 cells.
  • Glycolysis and glycolytic capacity increased in PA200-deficient cells, suggesting a metabolic shift.
  • Oligomycin-induced stress revealed preserved mitochondrial morphology and reduced OMA1 levels in shPA200 cells.
  • Proteolytic cleavage of Opa1 was affected in PA200-depleted cells.

Conclusions:

  • PA200 plays a role in regulating metabolic processes, including glycolysis and mitochondrial function.
  • PA200 deficiency promotes a shift towards glycolysis, particularly under metabolic stress.
  • PA200 influences mitochondrial dynamics and protein processing (Opa1 cleavage) in response to ATP synthase inhibition.