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Pyruvate protects pathogenic spirochetes from H2O2 killing.

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Pyruvate protects pathogenic spirochetes like Borrelia burgdorferi from reactive oxygen species (ROS). This metabolite is crucial for spirochete survival against host defenses, acting as a potent hydrogen peroxide scavenger.

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Area of Science:

  • Microbiology
  • Biochemistry
  • Immunology

Background:

  • Pathogenic spirochetes causing Lyme disease and leptospirosis face reactive oxygen species (ROS) during infection.
  • Understanding spirochete survival mechanisms against host-generated ROS is critical for disease control.

Purpose of the Study:

  • To investigate the protective role of pyruvate against hydrogen peroxide (H2O2)-induced oxidative stress in pathogenic spirochetes.
  • To determine if pyruvate can mitigate ROS produced by human neutrophils.

Main Methods:

  • Exposure of Borrelia burgdorferi and Leptospira interrogans to H2O2 with and without pyruvate.
  • Assessment of spirochete survival using gene deletion mutants (uvrB, mutS) in B. burgdorferi.
  • Measurement of ROS generated by human neutrophils stimulated with zymosan or B. burgdorferi.

Main Results:

  • Pyruvate conferred significant protection to both spirochete species against H2O2.
  • B. burgdorferi showed higher intrinsic resistance to H2O2 than L. interrogans.
  • DNA repair pathways (NER, MMR) were vital for B. burgdorferi survival, but pyruvate fully protected mutants.
  • Pyruvate reduced ROS production by neutrophils stimulated by zymosan and B. burgdorferi.

Conclusions:

  • Pyruvate acts as a critical extracellular H2O2 scavenger for pathogenic spirochetes, beyond its role in metabolism.
  • Pathogenic spirochetes may utilize host-derived pyruvate to evade the antibacterial oxidative burst.
  • Pyruvate's ability to neutralize neutrophil-derived ROS highlights a potential mechanism for spirochete persistence in host tissues.