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Area of Science:

  • Microbiology
  • Cellular Metabolism
  • Pathogenesis

Background:

  • *Streptococcus pneumoniae* (Spn) is a major cause of pneumonia.
  • Spn pathogenesis involves host metabolic manipulation.
  • Mechanisms of Spn-induced metabolic changes are not fully understood.

Purpose of the Study:

  • To elucidate the role of Spn-derived hydrogen peroxide (H₂O₂) in host cell metabolism.
  • To identify Spn-driven metabolic reprogramming in lung epithelial cells.
  • To explore potential therapeutic targets for pneumococcal diseases.

Main Methods:

  • *In vitro* studies using lung epithelial cells exposed to Spn.
  • Measurement of TCA cycle enzyme activity.
  • RNA sequencing to analyze gene expression changes.
  • Analysis of mitochondrial function and apoptosis.

Main Results:

  • Spn-derived H₂O₂, produced by pyruvate oxidase (SpxB), inhibits key TCA cycle enzymes.
  • Spn induces a Warburg-like metabolic shift, upregulating glycolysis and increasing lactate/acetate production.
  • Host cell mitochondrial membrane potential is preserved, with minimal apoptosis observed.
  • Citrate accumulation and reduced NADH production were noted.

Conclusions:

  • Spn actively reprograms host cell metabolism via H₂O₂ to enhance its survival.
  • The Warburg-like shift favors bacterial persistence while maintaining host cell integrity.
  • Targeting Spn's metabolic pathway offers potential therapeutic strategies for pneumonia.