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Pathogen-produced catalase affects immune priming: A potential pathogen strategy.

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Invertebrate immune priming, a defense boost after initial pathogen exposure, can be hindered by virulent parasites. Some parasites use antioxidants like catalase to overcome host defenses, impacting invertebrate survival.

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EntomopathogensImmune memoryInnate memoryMetarhizium anisopliaePathogen virulence

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Area of Science:

  • Immunology
  • Invertebrate biology
  • Pathogen-host interactions

Background:

  • Immune priming enhances invertebrate resistance to subsequent pathogen encounters.
  • Host immune responses may involve pro-oxidant production, which parasites can counteract with antioxidants.
  • Virulent pathogens might evade immune priming by masking host defenses.

Purpose of the Study:

  • To assess immune priming specificity in Tenebrio molitor against homologous and heterologous challenges.
  • To investigate the role of catalase overexpression in Metarhizium anisopliae virulence and its impact on host immune priming.
  • To explore the effect of reactive oxygen species (ROS) on T. molitor survival during fungal infection.

Main Methods:

  • Tenebrio molitor larvae were subjected to primary and secondary challenges with different Metarhizium anisopliae strains.
  • Survival rates were compared between groups challenged with homologous strains (Ma10 and CAT) and heterologous strains.
  • Paraquat, an ROS-promoting agent, was administered to assess its influence on host survival.

Main Results:

  • T. molitor larvae showed enhanced immune priming (higher survival) against the less virulent Ma10 strain compared to the CAT strain.
  • The more virulent CAT strain, which overexpresses catalase, impaired the immune priming response.
  • Paraquat administration improved T. molitor survival against both fungal strains, suggesting a role for ROS in defense.

Conclusions:

  • Virulent pathogens, like the CAT strain of M. anisopliae, may overcome pro-oxidant-mediated immune priming by producing antioxidants such as catalase.
  • Catalase overexpression is a potential virulence factor that impairs invertebrate immune priming.
  • Boosting host reactive oxygen species (ROS) production can enhance survival against certain fungal infections.