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Orientia tsutsugamushi Modulates RIPK3 Cellular Levels but Does Not Inhibit Necroptosis.

Thomas E Siff1, Paige E Allen1, David L Armistead1

  • 1Department of Microbiology and Immunology, School of Medicine, Virginia Commonwealth University Medical Center, Richmond, VA 23298, USA.

Pathogens (Basel, Switzerland)
|May 28, 2025
PubMed
Summary

Scrub typhus bacterium Orientia tsutsugamushi lowers RIPK3 levels, preventing necroptosis. However, it cannot inhibit this programmed cell death pathway once initiated, offering insights into disease mechanisms.

Keywords:
MLKLOrientia tsutsugamushiRIPK3Rickettsianecroptosisobligate intracellular bacteriumprogrammed cell deathscrub typhus

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Area of Science:

  • Microbiology
  • Cell Biology
  • Immunology

Background:

  • Scrub typhus, caused by Orientia tsutsugamushi, is an emerging infectious disease.
  • Necroptosis is a programmed cell death pathway regulated by RIPK3 and MLKL.
  • The interaction between O. tsutsugamushi and necroptosis remains unexplored.

Purpose of the Study:

  • To investigate the interplay between Orientia tsutsugamushi infection and necroptosis.
  • To determine if O. tsutsugamushi effectors Ank1 and Ank6 modulate necroptosis.
  • To understand how O. tsutsugamushi influences RIPK3 and MLKL activity.

Main Methods:

  • Analysis of RIPK3 levels in O. tsutsugamushi-infected cells.
  • Assessment of necroptosis induction in endothelial and HeLa cells.
  • Investigation of RIPK3 and MLKL phosphorylation and cell death.
  • Microscopy to observe MLKL colocalization.

Main Results:

  • O. tsutsugamushi infection reduces cellular RIPK3 levels.
  • Ank1 and Ank6 partially decrease RIPK3 levels, distinct from vIRD.
  • O. tsutsugamushi does not induce necroptosis in endothelial cells.
  • O. tsutsugamushi fails to inhibit RIPK3/MLKL phosphorylation and cell death in induced systems.
  • MLKL did not colocalize with O. tsutsugamushi or Listeria monocytogenes.

Conclusions:

  • O. tsutsugamushi reduces RIPK3 levels and avoids inducing necroptosis.
  • The bacterium cannot inhibit necroptosis once triggered.
  • This study provides foundational insights into the role of necroptosis in scrub typhus pathogenesis.