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House dust mite extract primes Drosophila melanogaster host defense against microbial infections, providing protection against Gram-negative and Gram-positive bacterial infections as well as fungal infections through distinct mechanisms. The extract induces a mild immune response and enhances anti-oxidant defenses. This discovery has implications for the development of novel therapeutic strategies against infections.

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Abstract

Abstract Allergen immunotherapy directly addresses the biological cause of allergies like those causing asthma. For perennial allergies, the treatment involves exposure to house dust mite (HDM) extracts that aim to block T helper 2 responses. Here, we investigate whether exposure to HDM extracts affects other aspects of innate host defenses against infection using the Drosophila genetic model organism. We find that pre-treatment of flies with HDM extract injection provides a degree of protection against several types of microbial infections, namely Gram-negative and Gram-positive bacterial infections as well as fungal infections. Interestingly, this protection appears to be achieved through distinct mechanisms. The priming afforded by HDM extracts against Gram-negative bacteria is mediated via a mild induction of the Immune deficiency pathway. In contrast, the protection against a Gram-positive bacterium, Staphylococcus aureus , and some Aspergillus fumigatus mycotoxins may involve the induction of host anti-oxidant defenses. We conclude that HDM extract appears to stimulate distinct host defenses that are differentially relevant according to the nature of the subsequent immune challenge. Future studies on the role of the host anti-oxidant responses in the Drosophila model will reveal how the host is able to cope with deleterious reactive oxygen species that may be generated during infections.

Key findings

  • HDM extract pre-treatment protects against Gram-negative bacterial infections via the Immune deficiency pathway
  • HDM extract pre-treatment protects against Gram-positive bacterial infections, such as Staphylococcus aureus, through host anti-oxidant defenses
  • HDM extract pre-treatment also protects against some Aspergillus fumigatus mycotoxins through host anti-oxidant defenses

Keywords

Host (biology)Drosophila melanogasterImmune systemInnate immune systemImmunologyMicrobiology

Identifiers

DOI
10.21203/rs.3.rs-8967685/v1
Journal
Research Square
Year
2026