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The Aedes aegypti IMD pathway is a critical component of the mosquito antifungal immune response

José L Ramirez1, Ephantus J Muturi1, Ana B F Barletta2

  • 1Crop Bioprotection Research Unit, National Center for Agricultural Utilization Research, Agricultural Research Service, United States Department of Agriculture, Peoria, IL, USA.

Developmental and Comparative Immunology
|December 25, 2018
PubMed

Insights

The mosquito immune deficiency (IMD) pathway is crucial for combating entomopathogenic fungi like Beauveria bassiana. Impairing this pathway increases fungal growth and reduces mosquito survival, highlighting its significant role in antifungal defense.

Area of Science:

  • Insect immunity
  • Molecular interactions
  • Entomopathogenic fungi

Background:

  • Mosquito antifungal responses involve complex molecular interactions.
  • Toll and Jak-STAT pathways are known regulators of mosquito immunity.
  • The role of the IMD pathway in mosquito antifungal defense requires further investigation.

Purpose of the Study:

  • To investigate the role of the IMD pathway in the Ae. aegypti antifungal immune response.
  • To determine the impact of entomopathogenic fungi Beauveria bassiana and Isaria javanica on IMD pathway activation.
  • To assess the consequences of IMD pathway impairment on fungal infection outcomes.

Main Methods:

  • Utilized RNAi gene silencing to impair the IMD pathway in Ae. aegypti.
  • Challenged mosquitoes with entomopathogenic fungi Beauveria bassiana and Isaria javanica.
  • Monitored IMD pathway component elicitation and antimicrobial peptide induction.

Main Results:

  • IMD pathway components were activated in response to both fungal species, primarily in the fat body.
  • Antimicrobial peptide induction was observed and found to be tissue and fungal strain-specific.
  • IMD pathway impairment led to increased fungal proliferation and decreased mosquito survival.

Conclusions:

  • The IMD pathway plays a significant role in the Ae. aegypti antifungal immune response.
  • IMD pathway activation is essential for controlling entomopathogenic fungal infections in mosquitoes.
  • Targeting the IMD pathway could be a strategy for vector control.
Keywords:
DefensinEntomopathogenic fungiIMD pathwayMosquito antifungal immunity

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